53.2: Field‐Sequential‐Color LCD Using Switched Organic EL Backlighting

Abstract

A new field sequential full‐color display composed of an optical compensated birefringent (OCB) LCD and a multicolored organic electro luminescent device (OEL) is proposed. In this display system, each merits of the LC device with high resolution capability and the OEL device with high‐speed response are combined. We fabricated a trial panel and confirmed its promising characteristics as a field sequential full‐color display in the next generation. Furthermore we suggest an advanced driving method. In this system, certain areas of stripe R, G or B phosphors are flashed sequentially by synchronizing with addressing LCD. This system can make the load of TFT decrease and get high intensity.

Development of an 8-bit VGA LCOS microdisplay with FSC modes using a low-cost process

“…In contrast, displays that use a spatial color filter have one-third the native resolution of the display. 4 This means that red, green, and blue light illuminates a single panel in rapid succession to produce a full-color image. So, a one-field driving time consists of the following time sequence: T1: Time to address the entire pixel matrix; T2: Response time of the LC; T3: Light emission time of the backlight.…”

Improvement of Transmittance and Viewing Angle of Optically Compensated Bend Mode Liquid Crystal Display Using Wide-Viewing-Angle Circular Polarizer

“…A field sequential color-refreshing (FSC) method is one solution to this problem, since it eliminates the loss at the color filters of conventional LCDs. [1][2][3][4][5] This method requires a fast-response LC cell and lamps that can flash quickly. Therefore, we employed an optically compensated bend (OCB)-mode LC cell and light-emitting diodes (LEDs) and fabricated an experimental display system using the FSC method.…”

Double-Pulse Scan of Field Sequential Color Driving of Optically Compensated Bend Cell

“…Field-sequential color (FSC) LCDs have been reported as one of the candidates for realizing full-color LCDs without color filters. [1][2][3][4][5][6][7][8][9] In FSC-LCDs, backlights sequentially flashing in the order of R, G, and B replace color filters. That is, FSC-LCDs display a color image using a temporal color mixture instead of a spatial color mixture.…”

“…Moreover, higher color gamut and motion blur-less images can be obtained through LED backlights with a high color purity and a fast on-off switching capability. [7][8][9] To drive a FSC-LCD, the timing schedule of the addressing time of all TFTs, the waiting time of the LC response over the whole display area, and the flashing time of backlights are important. Figure 1 shows the timing schedule of FSC driving in a TFT-LCD.…”

“…Various attempts for FSC driving using LC modes with fast response time, such as ferroelectric LC (FLC), 1,2) low cell-gap twisted nematic (TN) modes with low viscosity 3) and optically compensated bend (OCB) modes with nematic LC, [5][6][7][8][9] have been reported. However, low cell-gap TN-LCDs have a low yield in the manufacturing process and FLC displays have some difficulties in achieving a highquality alignment without defects.…”