L-4: Late-News Paper: A Simple and Practical Way to Cope With Color Breakup on Field Sequential Color LCDs

Abstract

In‐depth theoretical analysis is performed on several methods that have been proposed for the reduction of color breakup on field sequential color LCDs. Among them, our newly proposed method, RGBKKK, gives the best practical result. The results were verified on our field sequential OCB‐mode LCD of 36.9cm‐diagonal XGA size.

A novel driving method and device to reduce color breakup in color‐sequential displays

“…The conventional WRGB driving method with four subframes is generally operated at 240 Hz. 4 Thus, the gray level of white sub-frame is acquired from subtracting the minimum value of the three other sub-frames, as is indicated in Fig. 1.…”

“…Some publications have described that the colorbreakup problem has some relationship with motion blur in color-sequential LCDs. 4 Some driving methods to reduce motion blur 1-3 can be applied to reduce the color breakup in color-sequential displays. This phenomenon in color-sequential LCDs can be thought as the overlay area of the edge blurring with a different color backlight.…”

“…Increasing the sub-frame frequency in color-sequential displays is the most well-known method to reduce color breakup, but it has some limitations due to liquid-crystal response time and backlight modulation in color-sequential LCDs. In addition, inserting a black/white frame, inserting another color subframe, or changing the order of the sub-frames to reduce the color breakup in the color-sequential displays are also proposed in many papers, [6][7][8][9] According to Kazuo Sekiya et al, 4 it is shown that a simple sequence of RGBKKK is the best and most practical way in reducing the color breakup and also in reducing motion blur, but the luminance in the displays would be reduced by inserting the black frame. Thus, the WRGB driving method seems to be more suitable to consider the luminance and color breakup problem by the simulation results of his researches.…”

Color Sequential Mobile LCDs

“…Color breakup originates from mismatched movement between the human retina and moving targets, which generates undesired edge-color-blurred moving images [10][11][12][13][14]. In color sequential LCDs, especially in large panels, color breakup can be observed.…”

“…

yield, is by no means an easy task. Color breakup is a serious issue for large-panel color sequential LCD TVs and requires complex solutions, such as increasing the refresh rate, using motion compensation, or other techniques [10][11][12][13][14]. Color breakup originates from mismatched movement between the human retina and moving targets, which generates undesired edge-color-blurred moving images [10][11][12][13][14].

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