The tristimulus values (X, Y, Z) of the color need to be faithfully matched when a specified color is to be reproduced on the display. In RGB color system, there is only one solution, but in multi‐primary‐color system, there will be numerous combinations due to the color redundancy. In this paper, a 5.5‐inch 6‐primary‐color module was made with resolution of FHD (1920 x 1080) and a color conversion model was established to solve the problem of color reproduction redundancy.
As the screen of VR is very close to human eye and the optical lens has amplification effect, VR needs high PPI to meet people's visual requirements. High PPI panel with side-emitting LED backlight is difficult to realize high contrast ratio(CR). Local Dimming based on direct-illumination LED can not only save backlight power consumption but also improve the CR of the VR system. The point spread function(PSF) of LED plays an important role in Local Dimming technology. However traditional PSF always adopts approximate calculation method with low accuracy, which causes luminance distortion. In this paper, a method of PSF measurement and data processing was proposed. It can describe the spread strength and range of one single block LED actually. One improved LCD compensation algorithm was demonstrated in this paper. The light leakage characteristic of liquid crystal was considered. It can keep the hue consistent . The proposed Local Dimming method has low distortion and high dynamic contrast range. This paper also presents a method for implementing Local Dimming algorithm by GPU, which can display Local Dimming effect in real time of VR system with high frame rate.
Today HDR (High Dynamic Range) Displays are increasingly developed. The HDR Display with mini‐led backlight and liquid‐crystal panel plays an important role, it has a lot of advantages like high light (more than 1000nits), high contrast ratio (more than 100000:1), bright color and good permeability and so on. But it also has some display defects like halo[3] phenomenon in a dark scene. In this paper, first, we discuss some common picture quality issues caused by the normal local dimming algorithm[2] and then present a novel algorithm base on BOE COG (chip on glass) mini‐led backlight HDR display. The BOE COG technology is a global unique glass substrate backlight solution, and has some features to help the algorithm improve its performance. And for the local dimming display issues, the algorithm itself has room for optimizing visual effects. Finally, around the key point of local dimming algorithm, we show several advantages of BOE glass substrate backlight solution, its distinctive features can help the algorithm improve picture quality.
In order to meet the demand of high luminance and low power consumption for wearable AR (Augmented Reality) applications, two types of 0.71‐inch RGBW OLED micro‐displays were developed, reaching luminance of more than 5000 cd/m2 with resolution of FHD (1920 × 1080). RGBW mapping and sub‐pixel rendering algorithms were proposed to achieve good performance.
In this paper, we present a new method based on the Retinex algorithm to achieve the transformation of SDR image signal to HDR image signal. A novel tone mapping method is used in this algorithm, through which the image color distortion can be solved, the contrast and lightness can be improved and the effect of SDR image can be promoted as HDR image
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