Solution And Implementation Of Improving Visual Angle Of VA LCD

With the development of China's economy and science and technology,people's pursuit of quality of life has become higher and higher.For the display requirements,people began to pursue higher image display quality,lower price,more intelligent experience.At present,the display panel technologies of 4K LCD TV are mainly VA(Vertical Alignment),IPS(In-Plane Switching)and TN(Twisted Nematic).Among them,TN is the first one.Due to its disadvantages compared with the other two technologies,it is rare at present.VA and IPS almost completely dominate the LED backlight TV market.In comparison,the two have their own merits.Due to the different arrangement of liquid crystal molecules in structure,VA displays have excellent contrast,higher color quality,better black details,black uniformity and wider color gamut.However,VA display screen has an obvious angle problem.It means that in some angles,due to the uniformity of the screen display,the VA image display has some situations such as overexposure,which will affect the quality of the viewing experience.To solve this problem,the current mainstream solution is usually to change the internal structure of the LCD panel,that is to directly operate the LCD screen structure in production.In this way,the price of VA is becoming higher while the increase of the display effect isn't in the same level.In this paper,this disadvantage will be solved by designing a corresponding algorithm about brightness display,and a hardware IP VAC will be designing too.By using two gamma curves in odd and even sub-pixel points respectively,the original RGB input data is gamma calibrated,and the brightness will change in two directions,so that the brightness of each sub-pixel point is different from the surrounding four sub-pixel points.Thus,we can simulate a situation that when we observe a certain point from different directions,which is basically similar to the positive angle observation results.However,it will also introduce some problems.Therefore,the IP will also has two module which are focus to protect the high-frequency part and color part,especially skin color part.In the algorithm design phase,by C language simulation,the results will be made into images.In this way,the specific display effect can be observed by comparing with the original image on the existing VA panel.In the hardware design phase,by using FPGA platform,the PQ of the design effect can be observed.By controlling different register,and comparing with the original image,the final display effect can be observed in different stage,and the image display quality is improved.