Viewing angle switching of liquid crystal display using fringe-field switching to control off-axis phase retardation

Abstract

A viewing angle switchable liquid crystal display associated with fringe-field switching mode is proposed. In the device, one pixel is composed of a main pixel and a sub-pixel, in which both pixels are formed to generate a fringe electric field. However, the field directions are different from each other so that in the main pixel, the fringe field rotates the liquid crystal for displaying the main image, whereas it controls only the tilt angle of the liquid crystal without rotating in the sub-pixel region. In this way, phase retardation to cause leakage of light at the off-normal axis can be generated in the sub-pixel, and by utilizing the light, the main displayed image in the normal direction can be blocked in the oblique viewing direction.

Improvement of off‐axis color shift on hybrid viewing‐angle device using dual γ‐voltage method

“…Many related research on the viewing-angle switching technology of liquid crystal display (LCD) device have been reported, [1][2][3][4][5][6][7] but it is still a technological challenge about one viewing-angle controllable (VAC) liquid crystal (LC) panel which possess the mass conditions, such as the conveniences of production, low cost, and so on. There are various methods to realize a narrow viewingangle (NVA) of LCD with the privacy protection.…”

“…There are various methods to realize a narrow viewingangle (NVA) of LCD with the privacy protection. For example, a sticking privacy film, sub-pixel [1][2][3][4] , double LC cell, 5,6 and double backlight 7 techniques all belong it, but each one of them is with different disadvantages. These shortcomings of the sticking privacy film are with a fixed viewing-angle region that cannot be switched and the luminance of LCD will lose in great seriousness.…”

“…After overcoming many difficulties of production process, this kind of product with hybrid viewing-angle (HVA) of LCD panel that can be switched by one button is accomplished. 12,13 The brightness, contrast ratio (CR), and transmittance of LCD panels are frequently discussed in the NVA mode of VAC technology, [3][4][5][6][7][11][12][13] but this research of color shift [14][15][16][17][18] on the NVA mode is seldom discussed. Nevertheless, the off-axis color shift of LCD panels will be indeed observed at NVA during the production process.…”

Continuous Viewing Angle Distribution Control of Liquid Crystal Displays Using Polarization-Dependent Prism Array Film Stacked on Directional Backlight Unit

“…Other approaches are to realize the viewing angle control function without additional panel by using the pixel division method, in which one pixel is divided into two sub pixels for displaying the main image and controlling viewing angle [23][24][25][26][27][28], or by using three-terminal electrodes to control the gray scale together with viewing angle [29][30][31][32]. However, these methods need additional electronic circuits and electrodes within a pixel, which reduce the aperture ratio and light efficiency.…”

A high transmittance color liquid crystal display mode with controllable color gamut and transparency

“…Liquid crystal display (LCD) technologies have been developed to provide better electrooptical characteristics such as a wide viewing angle, fast response time, and high contrast ratio [1][2][3][4][5][6][7][8][9]. In spite of superior optical performances, studies on advanced LCD technologies are still required to realize more convenient and interactive display performance.…”