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Frame rate modulation for liquid crystal display (LCD)

A technology of equipment and display matrix, applied in the direction of static indicators, instruments, etc., can solve limited and other problems

Inactive Publication Date: 2004-06-30
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these prior art techniques help reduce flickering visual phantoms, they are limited in their ability to provide uniform dot patterns or a large number of gray levels

Method used

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  • Frame rate modulation for liquid crystal display (LCD)
  • Frame rate modulation for liquid crystal display (LCD)
  • Frame rate modulation for liquid crystal display (LCD)

Examples

Experimental program
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Embodiment Construction

[0061] Referring now to Figures 1A, 1B and 1C, which are general block diagrams of the environment in which the present invention operates. The source image S is output from an image generating device or input device 10, which may be, for example, a personal computer with graphics capabilities, digital video camera, scanner or the like. Source images can be still images or moving images from a video source. The source image is processed by the image processing unit 12 and sent to the LCD display device 14 for display. LCD display device 14 may be a flat panel display such as a computer or projector.

[0062] The image processing unit 12 may be implemented in hardware in combination with discrete components, software, firmware, application specific integrated circuits (ASICs), or any combination thereof. Furthermore, the division of the image processing unit into functional blocks in this specification is only for convenience of description. The functional and physical bound...

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PUM

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Abstract

The gray shade rendering capability of a display device having a frame rate of q frames per display cycle is enhanced by comparing an intensity value representing a gray shade of a current pixel with a respective dither matrix threshold value and providing a pixel on / off signal, storing a plurality of quantization values in a quantization table, outputting p quantization values from the quantization table as active quantization values, shifting the quantization values in the table, comparing a quantized threshold value to the active quantization values and producing an active quantized threshold signal, producing a pixel output signal in response to the pixel on / off signal and the active quantized threshold signal, and displaying the current pixel with an average gray value of p / q through a display period of q frames.

Description

[0001] This application is a continuation-in-part of co-pending prior application No. 08 / 890611 filed July 9, 1997, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates generally to display devices and, more particularly, to display devices in which only two states (on / off) or a limited number of discrete states are selectable for each picture element (pixel). More specifically, the present invention relates to methods and apparatus for enhancing the gray scale representation of a display device such as a liquid crystal display. Background technique [0003] There are many kinds of devices that can be used for image display, and their display performance varies widely. For example, in a CRT display, light is generated by three main phosphors, red, green and blue (RGB) phosphors, which are separately excited by electron beams in the CRT. Light of various colors and brightnesses can be generated by applying electron...

Claims

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Application Information

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IPC IPC(8): G02F1/133G09G3/20G09G3/36
CPCG09G3/2059G09G3/2018G09G3/3611G09G3/2051
Inventor 林宗男疏效平J·斯威科
Owner SEIKO EPSON CORP