Design of Dynamic LED Display Screen Based on a New Multi Bus

1 IntroductionAs a public information display terminal in subway, LED display has a very wide range of civil and commercial value.At present, metro vehicles running in China are generally equipped with LED display screen, but there are few additional functions and single screen display content. In order to cooperate with the use of the new subway passenger information system, we designed a new multi bus LED display dynamic screen.

Design of Dynamic LED Display Screen Based on a New Multi Bus 1

The display not only has a variety of bus interfaces in external communication, but also adopts single bus and I2C bus devices in the design of internal control circuit.

There are two kinds of LED screens on the subway: one is placed outside the carriage to display the train operation section, operation direction and current arrival station name, which is compatible in Chinese and English; Other service information can also be displayed according to operation needs; Text display can be static, scroll, pan, waterfall, animation and other effects. The maximum number of characters displayed is 16 16 dot matrix characters 12. The other is the terminal LED display screen, which is placed in the vehicle. The terminal LED display screen can preset the terminal according to the train operation requirements, display the current terminal in real time, and display the current temperature in the vehicle at the same time. The maximum number of characters displayed is 16 16 dot matrix characters 8.

2 system composition

The LED display system screen is composed of single chip microcomputer control unit and display unit. A single display unit can display 16 16. If a certain size LED graphic display system is produced, it can be realized by using several intelligent display units and the method of "building blocks", and the display units in the system are connected by serial communication. In addition to controlling the display unit and transmitting the instructions and signals of the upper computer, the control unit also embeds a single bus digital temperature sensor 18B20. Thanks to the module design of the control circuit, if humidity measurement is also required, 18B20 can be upgraded to the module circuit composed of DS2438 of Dallas company and hih23610 of Honeywell company. In order to meet the communication needs of the whole vehicle, can bus communication is adopted between the upper computer and each control unit in the vehicle.

Design of Dynamic LED Display Screen Based on a New Multi Bus 2

Figure 1 system structure diagram3 hardware design

The display unit is composed of LED display panel and display circuit. The LED display panel is composed of 4 dot matrix modules 64 dot matrix general intelligent display unit, a single display unit can display 4 16 in full screen 16 dot matrix Chinese characters or symbols. The display units in the system are connected by serial communication, so that the work of the whole system is coordinated and unified. The display circuit consists of two 16 pin flat wire ports, two 74h245 three state bus drivers, one 74hc04d six inverter, two 74h138 eight decoders and eight 74HC595 shift latches. The core of the control circuit is the high-speed single chip microcomputer 77e58 of Winbond, the crystal oscillator frequency is 24 MHz. A, and the ROM of t29c020a is 256 K, which is used to store 16 16 dot matrix Chinese character library and 16 8 dot matrix ASCII code table. A t24c020 is an ep2rom based on I2C serial bus, which stores preset statements, such as subway station name, greeting, etc. The temperature in the vehicle is measured by the single bus digital temperature sensor 18B20. SJA1000 and TJA1040 are can bus controller and transceiver respectively.

3.1 control circuit unit design

The whole system takes the dynamic single chip microcomputer 77e58 of Winbond as the core. The 77e58 adopts a redesigned microprocessor core, and its instructions are compatible with 51 series. However, because the clock cycle is only 4 cycles, its running speed is generally 2 3 times higher than that of the traditional 8051 at the same clock frequency. Therefore, it solves the frequency requirements of single chip microcomputer in the dynamic display of large capacity Chinese characters, It also comes with its own watchdog. 77e58 controls the flash memory a t29c020 with a size of 256 K through the latch 74l S373. Since the memory capacity is greater than 64 K, the paging addressing method is adopted in the design, that is, P1.1 and P1.2 are used to page select the flash memory, which is divided into 4 pages, and the addressing size of each page is 64 K. P1.5 is used for chip selection of a t29c020, It also ensures that P1.1 and P1.2 will not cause misoperation of a t29c020 when multiplexed on the 16 pin flat cable interface. Can controller is the key part of communication. In order to improve the anti-interference ability, 6n137 high-speed optocoupler is added between CAN controller SJA1000 and can transceiver TJA1040. The single chip microcomputer selects the chip of CAN controller SJA1000 through P3.0. 18b20 is a single bus device. The interface between the device and single chip microcomputer only needs to occupy one I / O port. It can directly convert the temperature into digital signal and output it serially in the form of 9-bit digital code. P1.4 is selected in the control circuit to complete the chip selection and data transmission functions of 18b20. The clock line SCL and bidirectional data line SDA of a t24c020 are connected to P1.6 and p1.7.16 pins of MCU respectively. The cable interface is the interface part of control circuit and display circuit. The hardware connection diagram of the control circuit is shown in Figure 2.

Fig. 2 hardware connection diagram of control circuit3.2 display unit connection and control

The display circuit part is connected with the 16 pin cable port of the control circuit part through the 16 pin cable port (1). The 16 pin cable port (1) transmits the instructions and data of the single chip microcomputer to the LED display circuit. The 16 pin cable (2) is used for the cascade of multiple display screens, and its wiring is basically the same as that of the 16 pin cable port (1), However, it should be noted that the R end is connected to the DS end of the 8th 74h595 from left to right in Figure 2. When cascading, it will be connected in series with the 16 pin flat cable (1) port of the next display screen (as shown in Figure 1). CL K is the clock signal terminal, STR is the row latch terminal, R is the data terminal, G (GND) and loe are the row lighting enable terminals, and a, B, C and D are the row selection terminals. The specific functions of each port are as follows: A, B, C and D are row selection terminals, which are used to control the specific data from the upper computer to the specified row on the display panel, and R is the data terminal to receive the data transmitted by the single chip microcomputer. The working sequence of the LED display unit is as follows: after the CLK clock signal terminal receives a data at the R terminal, the control circuit artificially gives a pulse rising edge, and STR is in one line of data (16 4) After all 64 data are transmitted, a pulse rising edge is given to latch the data; Loe is set to 1 by the single chip microcomputer to light up this line. The schematic diagram of display circuit is shown in Figure 3.

Figure 3 shows the circuit schematic diagram4 modular designMetro vehicles have different requirements for LED display screen according to the actual situation, so we have fully considered this when designing the circuit, that is, specific modules can be interchanged under the condition of ensuring that the main function and structure remain unchanged. The structure makes the LED control circuit have good expansibility and ease of use.

4.1 temperature and humidity module

In the hot and rainy areas in the south, although there is a constant temperature air conditioner in the car, humidity is also an important index concerned by passengers. The temperature and humidity module we designed has the function of measuring temperature and humidity. The temperature module and the temperature and humidity module have the same socket interface, and both are of single bus structure, which are controlled by P1.4 port, so it is very convenient to exchange. Hih3610 is a three terminal integrated humidity sensor with voltage output produced by Honeywell. DS2438 is a 10 bit a / D converter with single bus communication interface. The chip contains a high-resolution digital temperature sensor, which can be used for temperature compensation of humidity sensor. Figure 4 is the schematic diagram of temperature and humidity module.

Figure 4 Schematic diagram of temperature and humidity module4.2 485 bus expansion module

As a mature and cheap bus, 485 bus has an irreplaceable position in the field of industry and transportation. Therefore, we designed 485 bus expansion module, which can replace the original can module for external communication. The module uses Maxim's photoelectric isolation mxl1535e as 485 transceiver. In order to ensure control compatibility, mxl1535e and SJA1000 are chip selected through P3.0. In addition, 2500vrms electrical isolation is provided between RS2485 side and controller or control logic side through transformer. TVS diode circuit is added to the output part of the module to reduce line surge interference. Jumper can also be used to determine whether to load the terminal resistance of the bus. The schematic diagram is shown in Figure 5.

Figure 5 Schematic diagram of 485 bus expansion module5 software designThe system software consists of upper computer management software and unit controller control software. The upper computer management software is developed on the windows22000 operating platform with C build6.0, including display mode selection (including static, flashing, rolling, typing, etc.), rolling direction selection (including up and down rolling and left and right rolling), dynamic display speed adjustment (i.e. text flashing frequency, rolling speed, typing display speed, etc.), Display content input and display preview, etc.

When the system is running, the system can not only display the characters such as station announcement and advertisement according to the preset setting, but also manually input the required display characters. The control software of the unit controller is programmed by keil c of 8051 and solidified in the EEPROM of single chip microcomputer 77e58. It mainly completes the functions of upper and lower computer communication, temperature and humidity data acquisition, I / O interface control and so on. During actual operation, the temperature measurement accuracy reaches 0.5 , and the humidity measurement accuracy reaches 2% RH6 Conclusion

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This would only work for one person at a time with current technology, as far as I know. The input would then need to be processed into a 3D scene so that it could be re-displayed from other angles. This technology is reasonably mature and there are many technologies ranging from pure camera-based visible-light capturing with software processing, to active 3D scanning cameras that combine multiple active and passive inputs. Alternatively a tightly packed 2D array of cameras could be used and two suitable ones selected to match the relative head-screen orientation. Their field-of-view would still need to be manipulated according to the head-screen distance, this would most likely be easier to do digitally by cropping and scaling the image from a wide-angle lens
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However, in the mid-1990s, due to the lack of industry standards and basic testing methods, the white field color coordinates were usually determined only by human eyes and feelings, resulting in serious color deviation and randomness of white field color temperature. With the promulgation of industry standards and the completion of testing methods, many manufacturers began to standardize the color matching process of full-color screen. However, due to the lack of theoretical guidance of color matching, some manufacturers often allocate 100 field color coordinates at the expense of the gray level of some primary colors, and the comprehensive performance can not be improved.3. Chroma uniformity treatment.The chromaticity uniformity of LED display screen has always been a major problem perplexing people in the industry. It is generally believed that the uneven brightness of LED can be corrected at a single point to improve the brightness uniformity. The chromaticity unevenness cannot be corrected, and can only be improved by subdividing and screening the LED color coordinates.As people have higher and higher requirements for LED display screen, only subdividing and screening led color coordinates can not meet people's critical eyes. It is feasible to comprehensively correct the display screen and improve the chromaticity uniformity.We find that even the same LED of the first international brand has large wavelength deviation and color saturation deviation, and the deviation range greatly exceeds the threshold of human eyes for green color difference identification. Therefore, it is of great significance to correct the chromaticity uniformity.In CIE1931 chromaticity diagram, according to the law of the center of gravity, we find that the color coordinates of the mixed color can be adjusted to the intersection o of the straight line Cr and the straight line dB when green is mixed with a certain proportion of red and blue at any point within the range of G (& square; ABCD)Although the chromaticity uniformity can be greatly improved. However, the corrected color saturation decreases significantly. At the same time, another premise of using red and blue to correct the uniformity of green chromaticity is that the three red, green and blue LEDs in the same pixel should be centrally distributed as far as possible, so that the color mixing distance of red, green and blue can be as close as possible, so as to achieve better results. At present, the industry usually adopts the LED uniform distribution method, which will bring confusion to the chromaticity uniformity correction. In addition, how to measure the color coordinates of tens of thousands of red, green and blue LED is also an extremely difficult problem. We gave a hint.4. Color restoration processingThe birth of pure blue and green LED makes the full-color LED display popular in the industry with its wide color gamut and high brightness. However, due to the large deviation between the chromaticity coordinates of red, green and blue LED and that of PAL TV (see Table 1), the color restoration degree of LED full-color screen is poor. Especially in the performance of human skin color, there are obvious visual deviations. Therefore, color restoration technology came into being. Here, the author recommends two methods of color restoration:First, the color coordinate space of red, green and blue LED is transformed to make the three primary color coordinates between LED and PAL TV as close as possible, so as to greatly improve the color restoration degree of LED display screen. However, this method greatly reduces the color gamut range of LED display screen and greatly reduces the color saturation of the picture.Second, only the most sensitive skin color gamut of human eyes is properly corrected; The color gamut that is not sensitive to other human eyes should reduce the original color saturation as little as possible. In this way, a balance can be obtained between color reduction and color saturation.5. 3 2 multi primary color chroma processing methodEverything recovers in spring. Under the blue sky, the green grass is green; In autumn, wheat waves roll; Under the sun, it was golden. The colorful nature is so beautiful. Unfortunately, the existing LED display screen can not fully reproduce this beautiful scenery. Although LEDs belong to monochromatic light, each color LED still has a half wave width of about 30 50nm, so its color saturation is limited. It can be seen from Figure 3 that the color saturation of LED full-color screen is seriously insufficient in the large natural color rich $and cyan areas.In recent years, in the field of flat panel display, they are keen to discuss 3 3 multi primary color display (red, green, blue plus yellow, green and purple) to expand the color gamut and reproduce more abundant natural colors. Then, can the LED display realize 3 3 multi primary color display?We know that in the visible light range, yellow and green are monochromatic light. We already have $, cyan LEDs with high saturation. While purple is polychromatic light, single chip purple LED does not exist. Although we can not achieve red, green, blue plus yellow, green and purple 3 3 multi primary color LED display. However, it is feasible to study red, green, blue plus yellow and green 3 2 multi primary color LED displays. Due to the existence of a large number of high saturation colors and Cyans in nature; Therefore, this study is of certain value.In the current TV standards, the video source has only three primary colors of red, green and blue, but no two colors of yellow and green. Then, how to drive the yellow and green primary colors of the display terminal? In fact, when determining the driving intensity of yellow and green primary colors; We follow the following three principles:(1) The purpose of adding yellow and green primary colors is to expand the color gamut and improve the color saturation. The overall brightness value cannot be changed;(2) The hue shall not be changed while increasing the color saturation;(3) Centered on D65; Take the rygcb gamut boundary as the endpoint, and make linear expansion at each point within the gamut range.Under the guidance of the above three principles; According to the law of gravity center, we can find a 3 2 multi primary color chroma processing method. However, in order to truly realize the 3 2 multi primary color full-color screen, we have to overcome the lack of brightness of yellow and cyan LEDs; At present, it is limited to theoretical discussion.To sum up, we mainly discussed three aspects:(1) How to improve the chromaticity uniformity of LED display screen;(2) How to improve the color restoration of LED display screen;(3) How to expand the color gamut and restore more natural colors.When the above chroma processing technologies are implemented, they are interrelated, and in some aspects, even fish and bear's paw can't have both. The integrated LED display screen also needs brightness uniformity correction, gray nonlinear transformation, noise reduction processing, image enhancement processing, dynamic pixel processing, etc. the whole signal processing process is very complex. Therefore, we must comprehensively weigh various performances from the perspective of system, grasp the order of various processing, and increase the depth of signal processing, so as to make the LED full-color display show a colorful and colorful world.
Two Factors Affecting the Display Effect of Industrial Display Screen
Two Factors Affecting the Display Effect of Industrial Display Screen
With the more and more extensive use of industrial display screens, including industrial equipment, handheld equipment, medical equipment, public equipment, etc., industrial display screens are used as the display screens of terminal equipment. Of course, the display screens purchased by terminal manufacturers hope not only to have high reliability but also good display effect, which can also improve the competitiveness of terminal equipment, Today, Xiaobian will talk to you about what factors affect the display effect of industrial display screen?1 Backlight: cold cathode fluorescent (CCF) lamp is the most commonly used backlight in LCD. In the field of industrial application, the quality and service life of CCF backlight will affect the display effect of industrial display. Because the light source will decay with the increase of service time, manufacturers of high-quality industrial display will use high-quality CCF backlight to ensure its long service life and slow down the attenuation process of backlight, So as to ensure that the industrial display screen can maintain good display effect for a long time.2 Perspective: in general, commercial and consumer displays are designed for a single person sitting directly in front of the display. However, in most industrial applications, this kind of use is very rare. For example, the industrial display screen used by large machines will be inconvenient to operate directly in front of the display screen, so the display screen used for industry is usually facing the viewer from different angles. Therefore, the problem of viewing angle will affect the display effect of display equipment. In order to solve this problem, domestic professional industrial display manufacturers will use wide viewing angle display technology to produce, so that the industrial display has a wide viewing angle to meet various viewing needs.It can be seen that the perspective of the display screen and the backlight used will affect the display effect of the industrial display screen. In order to make the display effect of the display screen more excellent and lasting, high-quality industrial display screen manufacturers usually use advanced technology and high-quality accessories. Therefore, when purchasing industrial display screens, terminal manufacturers, It is particularly important to understand the manufacturer's reputation and quality.
Introduction to the Characteristics of Small Spacing LED Display Screen
Introduction to the Characteristics of Small Spacing LED Display Screen
With the increasing value of small spacing large screen system in command / dispatching center and video conference system in many fields, as well as the continuous improvement of national informatization, new industrialization construction and management application level, the rise of safe city and smart city, and the large screen splicing market will continue to maintain a stable growth trend in the future, From 2011 to 2019, the compound growth rate of market scale will exceed 40%.At the same time, due to the demand of various industries in terms of clarity, brightness, contrast and size, with the rapid growth of social informatization, the demand for information visualization has also expanded sharply. At the same time, it is more and more difficult to realize high-end visualization, especially in some important places such as monitoring center, command center and dispatching center, Therefore, large screen splicing system has become an indispensable core basic system for information visualization.In order to meet this development demand of the market, Jingrui Chuangxian jrcld has launched a variety of more accurate products. Taking the p0.7 p0.8 p0.9 P1.2 P1.4 P1.5 P1.6 small spacing LED display products of Jingrui Chuangxian jrcld as an example, a new generation of fully sealed front and rear full die-casting aluminum box design is adopted. The traditional die-casting aluminum box usually only supports post maintenance and installation, The new generation of full die-casting aluminum box can take into account the front maintenance and installation, which not only maintains the characteristics of high precision, no seam and excellent flatness of the traditional die-casting aluminum box, but also takes into account the characteristics of magnetic suction front maintenance, space saving and convenient installation.High brightness: brightness 1000nit, higher than LCD and DLP rear projection brightness, and can be automatically adjusted to achieve obvious energy saving and consumption reduction effect.Golden Ratio Design: original 16:9 gold unit size and resolution design, showing a perfect vision.High refresh rate: 2K / 4K / 8K # standard resolution display screen, with stable display, no ripple and flicker, and real and natural display effect.Wireless plug-in: full cast aluminum die-casting box structure, light and stable, wireless connector splicing between boxes, simple and generous appearance.High contrast: high quality surface paste three in one LED Black lamp is adopted, and the contrast can reach 5000:1.Strong processing ability of fast dynamic picture: nanosecond response time. When processing fast dynamic picture, there will be no tailing and ghosting.Front and rear maintenance: compatible with the front and rear maintenance methods, the disassembly is convenient and fast, saving maintenance time and cost.Good color consistency: the single point luminance meter color correction technology can ensure the uniformity of brightness and color when the product leaves the factory. It also has skin color restoration and green restoration technology to make the picture color more realistic.
Analysis on the Principle and Design Method of Chromaticity Correction of LED Display Screen
Analysis on the Principle and Design Method of Chromaticity Correction of LED Display Screen
With the technical progress of point-to-point correction, customers have higher and higher requirements for the display quality of LED screen, from only pursuing the brightness and white balance index to gradually improving the requirements for display uniformity and color fidelity. The use of point-to-point correction technology to greatly improve the uniformity of the display screen is currently in the process of rapid popularization and application, and the demand for chromaticity correction has gradually surfaced, which has attracted more and more attention in the industry. This paper will briefly introduce the principle, application, implementation methods and skills of LED display chromaticity correction.1. Basic concepts of chromaticity correctionCIE XYZ 1931 standard chromaticity system shall be used for chromaticity measurement and calculation of LED display screen. In order to introduce the calculation formula of chromaticity correction later, first, briefly sort out the basic concepts related to chromaticity correction:1.1 tristimulus valueAccording to Glassman's color matching principle, three primary colors are selected. Any one of the three primary colors cannot be obtained by adding and mixing the other two primary colors. For example, RGB primary colors, the relative brightness unit of the three primary colors is determined by selecting a specific white light as the standard, and the light of other colors can be regarded as a mixture of different amounts of three primary colors, The number of three primary colors required is the tristimulus value.CIE XYZ 1931 chromaticity system uses three imaginary primary colors, [x], [y], [Z] to replace RGB primary colors, and determines the units of three primary colors by matching isoenergetic white light. When quantitatively expressing the brightness and chromaticity of a light source, the chromaticity equation can be expressed as follows:C [C] = x [x] y [y] Z [Z] (equation 1)In the formula, x, y and Z are the three stimulus values, and the three stimulus values of the mixed color are the sum of the three stimulus values of each component color.Note that among the three primary colors, only [y] primary color represents both chromaticity and brightness, [x] and [Z] only represent chromaticity.1.2 color coordinatesThe relationship between the color coordinates x, y, Z and the tristimulus value XYZ in CIE XYZ 1931 chromaticity system is as follows:It can be seen that x, y and Z are not independent, and X y Z = 1. Therefore, only x and Y color coordinates can uniquely express the chromaticity.With three stimulus values, we can calculate the color coordinates x and y. Conversely, with the color coordinates x, y, and y, the tristimulus value XYZ can also be calculated, as shown in the following formula:Tristimulus value XYZ is the basis of mixed color superposition calculation, and mixed color superposition calculation is the theoretical basis of chromaticity correction.1.3 gamut spaceColor gamut refers to the range area composed of the number of colors that can be expressed by a surface color mode, and also refers to the color range that can be expressed by specific media such as screen display, digital output and printing reproduction.(Figure 1)Note: the large blue and white triangles in the figure are the assumed original color gamut space of the two LED screens, and the small black triangles inside are the set target standard color gamut space sRGB. The color gamut triangle is completely included by the two original color gamut triangles, so it is the color gamut space that can be realized by correction for both displays.For LED display screen, corresponding to CIE 1931 chromaticity diagram (see Figure 1), it is the color gamut triangle composed of three primary color coordinate lines and the set white point. The three primary color gamut triangle determines the color that the LED display can represent. The white dot defines the required ratio of three primary colors, that is, the unit quantity. After the production of a display screen is completed, its color gamut triangle is determined, and the adjustment of white balance can be realized by changing the ratio of RGB by adjusting resistance and other methods.The colors inside the three primary color gamut triangle are all the colors that can be realized by the mixing of the three primary colors.Therefore, the original color gamut space definition of an LED display screen shall include the following parameters:RxRy GxGy BxBy WxWyThe above four groups of color coordinates are the color coordinates of red, green, blue and white when the display screen displays (r255, G0, B0), (R0, g255, B0), (R0, G0, B255) and (r255, g255, B255).White is formed by mixing RGB three primary colors. Therefore, if the luminance values ry, Gy and by of RGB three colors are given, the respective tristimulus values of RGB three colors can be calculated.The white color coordinates Wx, WY and white brightness value WY can be calculated by the superposition of XYZ three stimulus values of RGB three colors:On the contrary, given the color coordinates and brightness value of white, the required brightness value of RGB three primary colors can also be calculated.2. Application field of chromaticity correction2.1 improve color fidelityThe most original application of LED screen chromaticity correction serves to improve the color fidelity of the display, make the displayed image consistent with the color of the source image, and restore the natural color more truly. To put it more popularly, it is to make the displayed color more "positive".The display content on the LED screen is generally from the TV camera, camera, or computer. The color gamut space of TV and computer monitor is inconsistent with that of LED screen, which leads to the phenomenon of display color distortion. For example, the common color gamut space standards pal and NTSC of TV and the color gamut space standard sRGB of computer monitor are inconsistent with the inherent color gamut space of LED display screen. The LED color gamut space is large, the color performance is usually over saturated, and the visual feeling is more gorgeous and exaggerated, so it is distorted.One of the objectives of chromaticity correction is to correct the color gamut space of the display screen to the color gamut space of the video or image source, or as close as possible, so as to improve the color fidelity of the display.2.2 mixing of different batches of boxesRental screen owners often encounter this situation: batch boxes purchased by time periods are expected to be mixed together to facilitate undertaking larger performance projects. Engineers sometimes encounter the requirements of customers, hoping to expand the area of an original display screen, and make a new part of the box and the old screen into a large screen.However, due to the difference between the original brightness and the original color gamut space, different batches of boxes go their own way and are incompatible.At this time, chromaticity correction can correct the original color gamut space of boxes in different batches to a coincident target color gamut space, so as to realize the mixing of boxes in different batches and the splicing of new and old screens.2.3 chromaticity uniformity correctionThe purpose of chromaticity uniformity correction is to improve the color difference between pixels of the display screen. At this time, each pixel and the combination of a group of RGB lamps can be regarded as a color gamut space. The task of chromaticity correction is to correct the color gamut space of all pixels on the display screen to the same color gamut space.At present, the application of chromaticity uniformity is very limited due to the color separation accuracy of light and color splitter and effective lamp mixing technology. Because the color difference resolution of human eyes to pixel level is about 4nm, and the color separation accuracy of light and color splitter can generally reach 1nm. Chromaticity uniformity correction is necessary unless a very large number of batches and a small number of inventory LED lamps are used for the same screen.3. Chromaticity correction principleAfter clarifying the concept of chromaticity and the application field of chromaticity correction, let's take a look at the principle and specific implementation method of chromaticity correction of LED display screen.The principle of chromaticity correction is gamut space transformation. The inherent wide gamut space of LED screen is transformed into a target gamut space set by the user, which can be either a standard gamut space or a user-defined gamut space.For LED screen, in order to ensure the display quality, we must ensure the uniformity of brightness while correcting chromaticity. Therefore, the bright color correction must be completed synchronously. Therefore, the corrected target brightness value shall be given at the same time.3.1 calculation of gamut space conversion coefficient matrixColor gamut space conversion first needs to determine the original color gamut space tristimulus value matrix [XYZ_ Original] and target gamut space tristimulus matrix [XYZ_ Target], so as to calculate the conversion coefficient matrix [conversion]_ coefficientorderAccording to the needs of color gamut space transformation, there are:conversion_ coefficient *XYZ_ original= XYZ_ Target] (equation 9)From the above formula:conversion_ coefficient= XYZ_ target* XYZ_ Original] - 1 (equation 10)In the conversion coefficient matrix of equation 8,RR is the luminance coefficient of the red light when the display source signal is red;RG is the brightness coefficient of green light when the display source signal is red;RB is the luminance coefficient of the blue lamp when the display source signal is red;GR is the luminance coefficient of red light when the display source signal is green;GG is the brightness coefficient of the green light when the display source signal is green;GB is the luminance coefficient of blue lamp when the display source signal is green;BR is the brightness coefficient of red light when the display source signal is blue;BG is the brightness coefficient of green light when the display source signal is blue;BB is the brightness coefficient of the blue lamp when the display source signal is blue;3.2 application of gamut space conversion coefficient matrixAfter obtaining the pixel by pixel color gamut space conversion coefficient matrix, the control system can adjust the color gamut space of the display screen to the target color gamut space by performing real-time pixel by pixel operation on the display source signal.Suppose the conversion coefficient matrix of a pixel is as follows:When the display signal is (r255, G128, B64), the actual lighting of the three lamps of the pixel is as follows:That is, the source signal (r255, G128, B64) is actually displayed as (R238, G128, B71) on this pixel.It should be noted that the above operation is based on linear brightness. In practical application, the coefficient application and linear operation should be carried out after gamma correction.4. Chromaticity correction skills of LED screenThe calculation method and application method are very clear. However, there are still some matters needing attention and skills in the calibration practice of LED screen.4.1 target gamut space settingThe reasonable setting of the target color gamut space is very important. Otherwise, it may not be achieved, or the white balance may not be achieved, or the brightness uniformity may be damaged.1) The three primary color coordinates of the target color gamut space must all be within the original color gamut triangle. The color outside the original color gamut triangle cannot be realized by color mixing on this display screen. In the Sv-1 correction system of zhongkeweiyou, CIE1931 color map is provided. The program will draw the original color gamut triangle and the target color gamut triangle, and give a graphical prompt that the target three primary colors are already within the original color gamut triangle to avoid setting errors.2) Because the maximum brightness of the three primary colors of the display screen is limited, if the white point coordinates and brightness values of the target color gamut space are set unreasonably, a large number of pixels on the display screen will not reach the predetermined target value. In the Sv-1 correction system, the number, proportion and position of pixels that cannot reach the target value on the display screen will be calculated according to the setting parameters of the target color gamut space, The simulation diagram is displayed to help users reasonably set the target white point and brightness.4.2 requirements for display screen and control systemFrom the example chromaticity correction data in 3.2, it can be seen that the value of the complementary color coefficient in the conversion correction coefficient is small and changes greatly, sometimes only one thousandth, and sometimes even 1 / 3. Therefore, the application of conversion correction coefficient puts forward higher requirements for display screen and control system.1) The display screen must be able to realize gray scale of more than 12 bits;2) The control system shall be able to read the conversion correction 9 coefficient data with accuracy of at least 12 bits and conduct real-time operation;Only when the above two conditions are met can the display screen ensure the accuracy of chromaticity correction and the brightness uniformity after correction.4.3 most applications of chromaticity correction are gamut space correction.The original three primary color coordinates required for the correction of color gamut space can be obtained by measuring the regional average color coordinates with a conventional color luminance meter. However, because the RGB brightness ratio in each pixel is inconsistent, it is necessary to ensure the calibration
Can You Hook Up Your IPod Touch to Your Tv and Display the Screen Without Having It Jail Broken ?
Can You Hook Up Your IPod Touch to Your Tv and Display the Screen Without Having It Jail Broken ?
You can a buy the apple tv, it connects to any HD tv think it works on ipods too1. What can I use to clean my laptop display screen?microfiber cloth LCD cleaning solution.2. I just built a computer and the system turns on, but I get no display on the screen at all.?I would try a new PSU first, and if that does not fix your problem try a new mobo3. Why is my monitor display screen too wide?Since you did not post what OS you are using, here are the instructions for windows XP. I think is similar for Vista and 7. First right-click on the desktop and then left click on Properties from the menu that appears. click on the settings tab at the top right of the box. Slide bar to change resolution. I think it's under personalize on Vista and 7.4. Alternative formulae for CMYK to RGB conversion for display on screenA quick fix for readability can be reducing the colorfulness. For 25% reduction let G=0,25.Calculate the average of your RGB numbers of the too bright conversion result. Let it be A.For every RGB number X calculate the new with reduced colorfulness, let's call it Y. Use formula Y=(1-G)XGAADD due the comment:You can take another ad-hoc number, the brightness reduction factor =F. Let F=0,8 to reduce the brightness to 80%. Multiply all RGB numbers with it.Be sure that these are no replacement for real color management math.5. I just built a computer and the system turns on, but I get no display on the screen at all.?Probably the electricity in your room is not so good. it happens to me all the time but my monitor never blacked out. Probably there is something seriously wrong with your electricity.6. How do I take a shot without the volume display on screen?Press Vol - plus Power button at the same time7. How much cost to repair Micromax Canvas 2 Q4310 display screen in India?The cost to repair your Micromax Canvas 2 Q4310 screen totally depends on which method you choose to fix it up. Few of the methods are like getting it fixed from authorized Micromax service center or getting it fixed by a local repair shop in your area or to do it yourself. * The 1st option is to go to authorized Micromax service center. They will charge a hefty amount on the same, but this will ensure 100% genuine replacement screen with warranty. Means this is the only method to ensure that you will get 100% genuine original screen and will get some limited time warranty on the part. * The 2nd option is to go to some local mobile repair shop in your area, where you can get your Micromax Canvas 2 Q4310 repaired for a better price deal but this wo not ensure good quality part and an unreliable warranty. Just make sure that you do not get fooled by a shop who claims to have a original screen for a higher price. Do you really think he can have tie ups with Micromax and get original genuine parts from them? The only way these shops can have a original screen is if they took out the screen from some other phone. Do It Yourself * The 3rd and the best option is to get a high quality replacement LCD Screen with Touch Digitizer for your Micromax Canvas 2 Q4310 from a reliable online store (like maxbhi.com) and get it fitted from the local repair shop for just 200-300 Rs. This way you will get a good quality display screen with good prices and a reliable warranty. You can even try to do this yourself with the help of youtube videos and phone opening toolkit for Micromax Canvas 2 Q4310. As per our research, Micromax Canvas 2 Q4310 screen replacement should cost something around 1400 Rupees in India.8. what difference between TFT and LCD ( lichid cristal display ) screen?TFT: Thin Film Transistor is a type of screen on which the viewing anle is maximum.The viewing angle will be as much as a normal CRT screen. LCD:Liquified Cristal Display consists of two screens sandwiched with the Liquid crystal. The viewing angle is very less
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