Analysis of Common Misunderstandings in Point by Point Correction Design of LED Display Screen

With the fierce market competition, the industry pays more and more attention to improving the display quality of the display screen. Point by point correction has been accepted as a conventional process by many high-end manufacturers, and is often included in the bidding document by the bidding unit of the display screen.

However, for the conditions, implementation, application fields and subsequent maintenance of point-to-point correction, there are still various misunderstandings and vague concepts in the industry. Some common misunderstandings are clarified and discussed below.

Myth 1: point by point correction requires the use of a special driver chip

As long as the control system supports, the general driver chip can also realize point by point correction!

Myth 2: point by point correction is done by the control system manufacturer, and the correction technology is bundled with the control system

The real necessary conditions for point by point correction are the following three points:

1. High precision and high efficiency light spot brightness acquisition equipment

2. Control system capable of point by point correction

3. Data docking of the above two

Point by point correction can be divided into two steps:

1. Accurately measure the brightness of each lamp / chip to obtain the point by point correction coefficient.

2. The correction coefficient data is fed back to the control system to realize the precise driving control point by point.

The point by point drive control has long been realized, and the general control systems in the market already have this function. However, for the acquisition of millions of light point data, some control system manufacturers have developed various tools, which are incompatible with other systems. This leads to the misunderstanding that the point by point correction and control system are bundled and integrated.

At present, there are several common acquisition methods, such as organic desktop point-to-point acquisition, digital camera acquisition, imported equipment acquisition and high-speed brightness measurement instrument Sv-1 system acquisition. Among them, Sv-1 system has realized data docking with most general control systems in the market. Display screen manufacturers can freely choose drive chips and control systems to complete convenient and efficient point-to-point correction by themselves.

Myth 3: as long as the spectral width is narrow enough, there is no need to correct it point by point

Even without considering the cost of fine segmentation, point-by-point correction is still very useful.

There are great limitations in using the light and color splitter to ensure the uniformity of the display screen. Firstly, the color separation accuracy of the light and color splitter can reach 1nm, which basically meets the requirements of chromaticity uniformity; However, the spectral accuracy is 10%! This means that even if the spectral width is 1:1.1, the actual brightness range of the lamp you get is about 1:1.3.

In the design and production process of display screen, circuit board design, mold shell design, box design, plug-in lamp, welding lamp, positive lamp and even assembly process will affect the display uniformity of final products. The display screen must undergo 72 hours of aging before leaving the factory, and the light attenuation of each light point is not consistent in the aging process. This leads to the uncontrollable uniformity of the finished display products to be delivered, which can not meet the design expectations at all. In addition, the use of light and color splitter to ensure the uniformity of the final product can not meet the needs of optimizing the display quality of the screen after a period of use.

So what can point by point correction do? Using high-precision acquisition equipment, such as Sv-1 system of zhongkeweiyou, can make great achievements in the following aspects:

1. As the last process before the display screen leaves the factory, the display uniformity is greatly improved. Using the Sv-1 system, even if the lamp with 1:1.1 light splitting is adopted, the accuracy of Sv-1 is enough to let you see the effect of improving the uniformity.

2. With the control system supporting chromaticity correction, Sv-1 can give the bright color correction coefficient matrix point by point, realize the color gamut space conversion, and improve the display uniformity and color fidelity.

3. Correct and maintain the display screen whose uniformity deteriorates after use for a period of time to improve the display quality.

However, the original spectral width is narrow, which is very valuable for point by point correction. Our experimental data show that:

a) The display screen with narrow original spectral width and good uniformity requires less brightness loss for correction.

According to the statistics of the measured data of Sv-1, it is also necessary to achieve about 3% of the pixel brightness mean square deviation after correction:

Original spectral width loss brightness ratio

b) The display screen with narrow original spectral width and good uniformity loses the same brightness proportion and smaller mean square error after correction.

According to the statistics of measured data of Sv-1, 10% brightness is also sacrificed:

Mean square error before original spectral width correction and mean square error after correction

Myth 4: chroma correction = chroma uniformity correction

The application of chromaticity correction is more the conversion of color gamut space.

Chromaticity correction can be divided into two main contents:

1. Gamut space correction: it solves the problem of full screen color fidelity.

2. Chromaticity uniformity correction: it solves the problem of color difference between pixels.

The application of gamut space correction is as follows:

1. Improve the color fidelity of the display screen and make the color restore more realistic: correct the color gamut space of the display screen to standard color spaces such as sRGB and NTSC.

2. Meet customers' special requirements for display gamut space: correct the display gamut space to the color space specified by customers.

3. Mixing of different batches of rental screen boxes: different batches of rental screen boxes correspond to different brightness and color gamut spaces. It is necessary to find a coincidence area and convert them to the same brightness and color space, so that there will be no brightness difference and chromaticity difference when they are used together.

4. Clean up the LED lights of different batches in inventory: as long as the LED lights of different batches are made into different boxes, the rental screen boxes of different batches are mixed with the same treatment method for correction, multiple batches of inventory lights of different batches can be used for the same display screen.

Under normal circumstances, after brightness correction, the bright color uniformity of the display screen can reach a very high level. With color gamut space correction, the color fidelity of the display screen can also reach a very high level.

5. Application of chromaticity uniformity correction

Due to the good color separation accuracy and stability of the light and color splitter and the effective process flow of lamp mixing and crystal mixing, the application occasions of chromaticity uniformity correction are quite limited, mainly as follows:

5.1 due to mistakes in the production process, lamps / chips of different wavelengths are mixed together and used on the same screen. Chromaticity uniformity correction can be used as a final remedy.

5.2 when clearing the inventory, be sure to mix a very small amount of lamps with scattered wavelengths on one screen. At this time, chromaticity uniformity correction is also the only choice.

Myth 5: chromaticity correction needs to measure color point by point

The color gamut space conversion needs the bright color correction coefficient point by point, but it is not necessary to measure the color point by point. Only the chromaticity uniformity correction must measure the color point by point.

Because the luminance ratio of RGB in each pixel is different, the color gamut space conversion needs to provide 3 for each pixel 3, but the calculation of the bright color correction coefficient only needs to provide the X and Y coordinate values of the regional color space, the X and Y coordinate values of the target color space, and the RGB brightness value of each light point.

Since the Sv-1 system can obtain the absolute brightness data (in CD / m2) of each lamp point, combined with the chromaticity data given by the conventional color coordinate measuring instrument, the target color space can be easily set by using the CCM (color correction module) software module in the system to obtain the bright color correction coefficient matrix of each pixel.

It should be noted that chromaticity correction needs the support of the control system. With the bright color correction data, the control system needs to be able to read correctly and use effectively in order to truly realize the bright color correction. Chromaticity correction puts forward higher requirements for gray scale depth, starting gray scale, operation resources and storage resources of the control system.

Myth 6: once the customer is satisfied after correction, everything will be fine

The subsequent maintenance of point by point correction requires professional tools.

At present, due to the popularization and generalization of point-to-point correction, many display manufacturers have not realized the necessity of subsequent maintenance tools after point-to-point correction. If this is ignored, it is likely to pay a heavy price.

Since the data of point-to-point correction must be strictly one-to-one corresponding to the light point, the subsequent maintenance of point-to-point correction is far more complex than expected, and strong engineering management is required, including many professional tools such as overall data, local data storage and reproduction, data segmentation, reorganization and replacement, fine tuning and so on.

Maintenance after point by point correction requires many considerations, such as:

1. What if the control card is replaced?

2. What if the module / unit board is replaced and repaired?

3. What about correcting data loss?

4. When the old and new batches of boxes are mixed, can the data of the old box not be collected again?

Analysis of Common Misunderstandings in Point by Point Correction Design of LED Display Screen 1

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The Application and Effect of the LED Display Screen
The Application and Effect of the LED Display Screen
Quite a few technological cynics would say it really is these kinds of a waste of money to buy iPod touch 32GB. Blame it on the absence of initial-hand details and ignorance on the subject and on the gadget. What they never know is how useful this gadget is in every day things to do.Reality is, the iPod touch is among the couple of devices that don't appear and go. It is really not a little something that you will just throw absent in the bin and get bored with effortlessly. That stated, let's take a appear at the positive aspects an individual gets from acquiring the gadget.1. The storage and memory potential is large. To begin with, the storage potential is 32GB, and second, it has an integrated memory flash for supplemental capability. When it comes to storage and memory purposes, it can serve you properly for keeping several music files, movies, photographs, and video games as significantly as you want-just about like your particular laptop or computer turned into a helpful 1.2. It is Wi-Fi able, which signifies you can surf the web as nicely. Therefore, there is no need to have to often be managing to your own computer to surf and look at your mails or favored movies. Not only that, you can as properly use this gadget for investigation functions, thanks to its Wi-Fi capability which aids you connect anyplace at anytime.three. The stereo sound good quality is superior, distinct, and dependable, in contrast to those common transportable disc gamers that may perhaps put on out in time. It has a developed-in equalizer that enhances the superior and stability of the sound, removing also a lot noise.four. The iPod touch is also fairly like your digital camera the place you can store your digital images in different specifications and continue to keep its substantial excellent, and considerably like your video clip recorder that supports different digital video criteria, also.5. Very last but not the least, it presents unique headphone styles for ease of use.Having said that, of course, in every single technological creation, there are always one or two characteristics that you, as a purchaser, might not like. That's regular. For an individual, due to the fact it really is designed helpful, the tiny display keyboard may well be considered a bane for some gadget freaks who want significant keyboards or display screen that is. Utilize prevalent perception though: If you want a even bigger screen or keyboard, go get a mini-laptop or computer system, not an iPod touch. The modest display screen and keyboard was a principle to make the gadget useful to use at any time, anywhere, not having sensation the bulk of carrying or keeping it.When you approach to purchase iPod touch 32GB, you are certain to obtain a beneficial products. But never neglect this, a superior product signifies a different point: a swooping price tag tag. Are you all set to get ripped off? Try to remember, correct to what you hear, Apple brand does not market its items low-cost and not often goes on a sale or low cost. Nonetheless, if you are fairly positive you want an iPod touch, go in advance and sacrifice your financial savings just this one time. I'm sure you won't regret it.Tags:
What Are the Characteristics of LED Display Screen?
What Are the Characteristics of LED Display Screen?
Out of all the extreme vaporizer the V-Tower vaporizer turn out to be outstanding with some special features like beautiful LCD display screen, Stainless steel housing, plenty of glass and a blue base lights. The V-Tower has become the market leaders when it comes to vaporizers and surely deserves the place. During the procedure in the Arizer Extreme vaporizer the hot air passes through the bowl into the bag or it can also pass through the hose. For displaying the temperature it has an LCD screen and has a fan which has a feature for controlling the speed. In the presence of the whips the hits make are fine and quick. It is automatic and has a remote. So now you can sit back and relax while the vaporizer will do the job. Thus the extreme vaporizer us a best for your pocket as well for its features. Some of the attributes of Extreme Vaporizers are: This vaporizer will only cost you around 299$ at the Vaporizer giant while the digital vaporizer will come at the price range of 699$. Next it has an LCD screen which shows the temperature and as the feature of fan also which you can adjust yourself according to the suitability of your herb. You can also change the temperature from Celsius to Fahrenheit. The Glass used is made from the borosilicate which is the toughest glass in the world. The glass has got finesse by giving it a perfect structure and a shape. The taste of the herb is a delight in the company of a ceramic heater and thus uplifting its natural herbs. It is the only vaporizers which is fully automatic and comes with a remote control. It has all the automatic functions like on/off, adjusting speed of the fan , a timer. Also it gives you the feature of 9 preset temperatures giving you the wide variety of temperatures to choose from. It is also equipped with lots of glass and a chamber in which the procedure runs through smoothly giving you the pleasure of smoking.
How to Solve the Problem of LED Display Screen Is Not Bright
How to Solve the Problem of LED Display Screen Is Not Bright
MYSORE: The postal department has gone hi-tech in advertisement of its products and schemes. The Liquid Crystal Display (LCD) screens have been put up at three post offices in the city to educate public about various facilities provided by the department. As part of modernization, the authorities have installed display screens at the head post office near Nehru Circle and at Saraswathipuram and K R Nagara branches to promote its mail, financial and premium services. An official at the head post office stated that the display screen was installed six months ago and it has yielded results as more number of people are coming forward to avail of the facilities. According to him, over 1,000 persons visit the post office everyday and this has come handy for them to educate masses. The e-post serive ensures larger reach. With this facility, people can send their message to any address in India with a combination of electronic transmission and physical delivery through a network of over 1.55 lakh post offices. E-post sends message as a soft copy through the internet and it will be delivered in the form of a hardcopy. The service costs Rs 10 per A-4 size paper. Such facilities are being screened to create awareness. This apart, consumer awareness advertisements are being displayed to educate people about supply of foodgrains through the public distribution system. Assistant superintendent of posts, Mysore division, Mahadevaiah told TOI that the initiative is a part of the Project Arrow scheme. LCD screens are put up at three posts office to promote products relating to business development, insurance and finance.
Teach You How to Choose the LED Display Screen of the Hotel
Teach You How to Choose the LED Display Screen of the Hotel
What should we pay attention to in the selection of LED display in hotel banquet hall? Generally, in the indoor environment, the screen area will exceed 3 m2. Therefore, in this case, there are three options: ordinary rear projection, DLP (digital liquid crystal rear projection) and LED display.The advantages of ordinary rear projection display screen are small pixels and high definition. The disadvantages are low brightness, small viewing angle and short lens lamp life (only a few thousand hours). DLP has the advantages of small pixel points and high definition. The disadvantage is that it has seam. At present, the minimum seam can reach 1mm. Rear projection and plasma display screens are suitable for close viewing. For Maipu Guangcai indoor LED display, the advantages are high brightness and no seam, while the disadvantages are coarse pixel particles and low definition. At present, the economic model of commercialized indoor full-color LED screen is p5p6, and other models include p3p4p7.62p8. LED display screen is suitable for indoor places with long viewing distance.When selecting LED display in banquet hall, the following aspects can be considered:1. Die. Like the outdoor full-color LED screen, it is generally recommended that the LED of the indoor full-color display screen adopt the LED encapsulated by Maipu brilliance, and the tube cores of Japan Riya and Cree of the United States are recommended for high-end products.2. Packaging form. The advantages of surface mount packaging are large viewing angle, good luminous consistency and easy automatic welding processing. It is the mainstream product of full-color screen.3. Density. Due to the large heating capacity of indoor full-color LED chip and high density of control circuit, the point density of commercial full-color screen can not be very high. Hotel Maipu Guangcai LED display manufacturer4. Drive mode. The driving mode of indoor Maipu Guangcai full-color LED screen is constant current driving and adopts dynamic scanning mode (mainly 1 / 4, 1 / 81 / 16 and other scanning modes).5. Refresh rate. Improve the refresh rate, and there is no flicker and tailing when shooting with the camera.Other considerations include the scale and brand, price, purpose, installation location and environment of LED display manufacturers. The above are some suggestions on the selection of LED display in hotel banquet hall.fqj
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