Stencil-LPD Method for High Quality Color Filter-Less 120Hz Field-Sequential-Color Displays

• Main Authors: Chang, Chi-Wen, 張綺文
• Other Authors: Hsu, Ken-Yu
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/21233589817381520625

碩士 === 國立交通大學 === 照明與能源光電研究所 === 100 === Since a field-sequential-color LCD (FSC-LCD) does not require color filters, it has potential to be the next-generation eco-display. The conventional FSC-LCD sequentially flashes red, green, and blue field images at 180Hz field rate to form a full color image by the integration on the retina. Considering the currently used LC modes, a two-field method driving at a field rate of 120Hz has been the mainstream to develop. However, only two fields to display full color images formed by the three primaries, it is lack of a degree of freedom resulting image distortion. Thus, in the previous solutions, a specific color filter was applied, known as the 2F2CF method proposed by Phillips. By doing so, it can reproduce exactly the same image with the original one but still needs color filters. The other method, two-color-field proposed by NCTU, is to divide the blue information, which is the least sensitive color to human eyes, into two parts and to combine them with red and green information individually. This method does not require color filters but cause color distortion. In this thesis, a novel two-field display method, Stencil-LPD, was proposed without color filters. The Stencil-LPD method can provide proper backlight colors according to the image content that can decrease the color difference caused by the lack of degree of freedom. Compared to the two-color-field method, the proposed method reduced the color distortion by 53%. Besides, Stencil-LPD method provided less but sufficient saturation colors as backlight signals, the chrominance difference was lowered that diminishes the relative CBU value to 64% while it is 89% in the two-color-field method.