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.

Two Factors Affecting the Display Effect of Industrial Display Screen 1

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.

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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.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 compositionThe 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.Figure 1 system structure diagram3 hardware designThe 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 designThe 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 controlThe 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 moduleIn 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 moduleAs 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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