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Adaptive pre-write for colour sequential LCD driving

An adaptive, driving voltage technology, applied to instruments, static indicators, etc., can solve the problems of reducing color crosstalk or brightness loss, insufficient, etc.

Inactive Publication Date: 2007-03-07
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This prior art still introduces a significant delay when driving each pixel between the two colors, as the dark or light state is generated by driving the pixel with the output voltage before the system is updated with the video data in order to reduce color crosstalk or loss of brightness still insufficient

Method used

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  • Adaptive pre-write for colour sequential LCD driving
  • Adaptive pre-write for colour sequential LCD driving
  • Adaptive pre-write for colour sequential LCD driving

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Embodiment Construction

[0011] In the following description of various embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration various embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural and functional modifications may be made in the disclosed embodiments without departing from the scope of the present invention.

[0012] Figure 1a shows a plot of luminance as a function of applied voltage for different colors. A minimum voltage or threshold voltage (approximately 1.5V in Figure 1a) is required to achieve a response from the liquid crystal material. The above-mentioned brightness reaches saturation at a higher voltage (approximately 6V in Figure 1a), and between the threshold voltage and the saturation voltage, the brightness is a function of the applied voltage: the brightness varies linearly with the applied voltage.

[0013] Figures 1b to 1e sh...

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Abstract

This invention relates to a system (100) for adaptively driving a coloured liquid crystal display (102) displaying a sequence of images. The system (100) comprises driving electronics (106) for supplying a driving voltage for each pixel in the display (102), a frame memory (116) for storing a first image of the sequence of images, which first image is presently displayed on said display (102). In addition, the system (100) comprises a look-up table (110) for generating a pre-write signal (108) for the driving electronics (106) based on the first image in the frame memory (116) and a subsequent image to be displayed on the display (102).

Description

technical field [0001] The present invention relates to a system for adaptively driving a liquid crystal display (LCD). In particular, the present invention relates to pixel voltage controllers. Background technique [0002] When driving an LCD panel, switching from white to black is faster than switching from black to white (relaxation). This switching behavior thus leads to color crosstalk when driving an LCD panel using color sequential projection (eg image series), because the applied voltage to a pixel's current color affects the switching speed to the next color for that pixel. To solve this problem, as described in US Pat. No. 6,320,565, a pre-written state or blanking pulse, an auxiliary signal that resets the pixels before each new addressing with display data, can be used. This US patent discloses a system in which pixels are reset to a dark or light state prior to storing subsequent video data. By applying a reset pulse to an entire row of pixels that precedes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G2340/16G09G2320/0209G09G3/3611G09G2320/0285
Inventor J·M·A·范登厄伦比姆德
Owner KONINK PHILIPS ELECTRONICS NV