High contrast reflective liquid crystal display using a thermochromic reflector

Abstract

This paper presents a reflective liquid crystal display (LCD) with a high contrast ratio (CR) combined with mono-type thermochromic materials to solve the low CR of reflective type LCDs. Here, reflective, wide-band, electrically controlled birefringence mode was used as the optical liquid crystal (LC) mode, and a thermochromic material was used as the reflector for the white state and an absorber for the dark state. The combination of LCD and thermochromic material can have a synergistic effect in achieving a better display. By controlling the reflectance of the thermochromic reflector using Joule heating, the proposed reflective LC cell exhibited a high CR of approximately 70:1. The figure was extremely high compared to the approximately 10:1 of a typical reflective LC cell with an optically wide band design. The proposed LC cell configuration is expected to find many outdoor applications which can admit slow response speed.

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film†

“…Healthy eye-care display is becoming more and more important as individuals strive to live healthier lifestyles. More and more research is being done on RLCDs that eliminate backlight and use ambient light as the source of light because the blue band in LCD backlights is bad for human eyes [1][2][3][4][5][6][7][8][9] . The reflective metal in conventional RLCD cell serves as the reflective surface for RLCD, which typically modulates the light using 1/2λ and 1/4λ plate [1, 2 and 11] .…”

Using Periodic Trapezoidal Ag Strips and Silicon Dioxide Slab for Polarization-Independent Narrowband Absorber

“…Gratings are widely used in many fields due to their special periodic structure. [1][2][3] With its unique characteristics of beam splitting, polarization, dispersion, absorption, and phase matching, gratings occupy an important position in optical communications, [4,5] wavelength division multiplexing, [6][7][8][9] photoelectric sensors, [10][11][12][13][14] liquid crystal displays, [15][16][17] and optical signal acquisition and processing. [18][19][20] The absorber can achieve single-band and multi-band absorption with different structural designs.…”