| As the second generation of display technology following the CRT display tech-nology,liquid crystal display technology has gained tremendous growth in recent years.With the dramatic improvements in terms of cost,power consumption,resolution,con-trast,viewing angle and response time,liquid crystal displays（LCD）have become the most mature display devices on the market.However,the dynamic range of the tradi-tional LCD is limited,generally less than 103:1.The brightness of nature in the range of about 10-610+8 cd/m2,through the pupil adjustment,the human visual system can adaptively perceived a range of about 10-310+5 cd/m2 in different light conditions,such as the faint stars in the night sky or the bright sunshine in summer.Even at the same scenes,the human eye can feel the brightness range of about 5 orders of magni-tude.Therefore,the traditional LCD is difficult to meet the human eye's vision,result-ing in an unrealistic display.High dynamic range display technology is used to restore the dynamic range of natural scenes on the display device technology,the higher the dynamic range of the display is,the stronger the ability to show details and the more layered the picture presented.In order to solve the shortcomings of the level performance of traditional display systems,this paper propose a dual-modulation architecture using white and emerald blue light emitting diodes（WE LEDs）arrays as the LCD backlight,and the dynamic range improvement and color display improvement was demonstrated.According to this structure,the design of high dynamic range（HDR）display system is completed.The system is divided into modules according to the structure and function of the sys-tem.The hardware structure and functions of the display system are introduced in detail,and the firmware of each module is summarized.Since then,the software platform used in the system was introduced.With the support of this platform,the parameters of the system are obtained.The peak luminance of this system is 1258 cd/m2,the luminance of black is less than 0.02 cd/m2 and the color gamut coverage is 45.65%.Compared with the traditional display,the dynamic range of the display system have been greatly improved,the performance of details and color rendering capabilities have been significantly improved.In the aspect of the display algorithm,this paper studies the display algorithm used in the dual modulation display structure of LED-LCD and proposes an HDR display algorithm based on the imaging model for the display structure of WE LEDs-LCD,and then the ideal of the algorithm is described in detail.This algorithm can effectively achieve a rich level of HDR display and has obvious advantages in the emerald blue performance. |
