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Pixel Parsing Of Led Display

Shenzhen Lights Technology Co.,Ltd | Updated: Mar 17, 2016



1. chromatic correction

 Because of differences in color coordinates, there is a difference in color gamut television video signal and LED color gamut, resulting in the live TV broadcast color seems unreal. Therefore, color coordinate correction Shifenzhongyao. Conversion calculate the correction is more complicated and difficult to complete the software.

2. The gray level

That is the so-called gray or gray-scale gradation, refers to the degree of brightness and shade. For digitized display technology, the gray scale factor is to determine the number of colors displayed. Generally the higher the gray level, the richer the color displayed, the picture is more delicate, more performance of rich detail.

Gray level mainly depends on the system A / D conversion bit number. Of course, the system of video processing chip, memory and transmission systems must provide support to the respective number of bits of the job.

3. Pixels out of control rate refers to the minimum imaging unit work screen is not normal proportion. The pixel out of control has two modes: one blind spot, which is the blind spot, at times it does not need bright light, called the blind spot; the second is often bright spot, does not shine when you need it, and it has been lit. , often referred to as the highlights. The runaway is generally not the same pixels in red, green and blue light all out of control at the same time, but as long as a lamp out of control, out of control it that this pixel. Each of the primary colors (red, green, and blue) were out of control pixel statistics and calculations, whichever is the highest value as pixel screen control rate by LED display. Figure primes runaway total number of full-screen pixel ratio, referred to as "the whole screen pixels out of control rate."

4. Consistency

Full color LED display the most difficult is consistency, or the audience most likely to be perceived consistency problems is not good, the screen appears a deep one shallow, commonly known as the mosaic, is the most disgusting. Consistency is not good cause are many, including the selection of quality LED drive circuit, structural design and construction. However, unless the discrete nature of too much light-emitting diode, the consistency or the main problem is the design and construction issues. Perhaps the average person watching questionable LED outdoor display, perhaps beginning to see the mosaic, perhaps very light but it did observe the ordinary people and professionals will have some differences.

5. Identification of brightness level

Brightness discrimination level refers to the human eye can distinguish the image from the black to white between the brightness level. Mentioned some high level greyscale screen can reach 256 or even 1024. However, due to the limited sensitivity of the human eye to brightness, and can not fully recognize these gray levels. That may be a lot of adjacent level gray eye looks the same. And the eyes ability to distinguish different person. For the screen, the human eye to identify the level of naturally better, because the displayed image after all posters. The human eye can distinguish brightness level, the greater the color space means the screen, showing rich colors potential for greater. Brightness discrimination level can use special software to test generally able to display more than 20, even if the level is good.

6. Digital processing capacity

 To achieve high-quality image, you must have a high quality video signal source. Thus, the input signal digital processing, to enhance the image quality is indispensable. In fact we have such an experience: when playing a select program, the display effect is very satisfactory, but if it was a live broadcast TV or DVD screenings, it is inevitable that various screens and lenses, such as night scene or dark big screen bright screen size, high brightness, then the effect is being reduced. Treatment is a particular problem in the large-screen LED display, we work hard to study. Due to the large video screen pixel is always less than the source of information, while playing the inevitable problems encountered in scaling, sampling and reproducing the losses and defects caused by aliasing and image quality will result in decline. How to reduce and reduce losses, the need digital signal processing technology. Digital image processing technology has made great progress, there are many results, such as large-size TV or projector technical achievements can be applied directly to the big screen in the past. Processing capacity digital processing system embodied in the deal with the number of bits and processing speed, the use of high-end DSP or FPGA is an inevitable trend.

7. A gray nonlinear transformation

Gray nonlinear transformation refers to the gray-scale data in accordance with empirical data or some arithmetic nonlinear relationship and then transformed to the screen display. Because LED is a linear device, with non-linear display characteristics different from traditional monitors.

8. reliability and lifetime

Reliability is the life of the screen, whether it is for a corporate image, or activity-based business model, LED display stable and reliable is critical. Reliability index by the mean time between failure (MTBF) and mean time to repair (MTTR) to express. MTBF10000 hours is a very high index, in fact, does not necessarily need.


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