34.3: Quasi‐ and Analog‐Full‐Color Displaying Methods with High Light Efficiency in Super‐High‐Resolution LCDs

Abstract

AbstractA new coloring method of LCD (liquid crystal display) using the hybrid structure of CF (color filter) method and the interference coloration of ECB (electrically controlled birefringence) effect is presented. One unit pixel is divided into at least two sub‐pixels, and the one sub‐pixel is equipped with a green CF and the other one a magenta CF. As for the green coloration of the highest luminosity property, a green CF is used in order to display the analogue gray scale. The interference coloration of ECB effect with a magenta CF is used for red and blue binary coloration as well as analogue gray scale of the magenta color. Monochrome gray scale can be realized by the additive color mixing of green and magenta sub‐pixels.The VA (vertical alignment) mode is adopted for suppressing the temperature dependence of the optical retardation. We can achieve much better light efficiency than that of the conventional color LCDs with both an RGB‐CF and a polarizer. This mode has the features of quasi‐full color and wide color space for red and blue color by the subtractive color mixing effect between interference coloration and magenta CF. Furthermore, the present LCD can be fabricated without changing the conventional LCD process and materials.We also present the analog‐full‐color method, which can be realized by using small additive sub‐pixels of red and blue colors.