Drive method for increasing gray level

A driving method and gray-scale technology, applied to instruments, static indicators, etc., can solve the problems of increasing circuit complexity and manufacturing costs, and achieve the effects of stable output, reducing crosstalk distortion, and prolonging the life of the panel

Inactive Publication Date: 2009-07-01
SITRONIX TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the PWM mode needs to adjust the timing of the drive circuit output, it is necessary to replace the original LCD control circuit and LCD drive circuit at the same time.
That is, the output management of the segment drive circuit must be specially designed to replace the original segment drive circuit design, which will increase the complexity of the circuit and the manufacturing cost

Method used

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  • Drive method for increasing gray level
  • Drive method for increasing gray level
  • Drive method for increasing gray level

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Embodiment Construction

[0027] Relevant detailed content and technical description of the present invention, now in conjunction with accompanying drawing, explain as follows:

[0028] see Figure 4 As shown, it is a graph of the relationship between the grayscale visual effect and the number of pixel lighting times when the pulse width modulation mode (4FRM+3PWM) is added to the frame frequency modulation mode. The frame rate modulation mode uses the number of times of ON / OFF in N frames per second to determine the gray scale of the pixel at that point. The grayscale principle of FRM is to control the number of lighting times of a pixel, so that the grayscale level of the pixel is determined by the proportion of the number of lighting times in N frames. Taking the number of frames per second as 3 times (4FRM) as an example, in the traditional driving method, there is only the difference between the grayscale (G0~G3) visual effect of the frame frequency modulation (FRM) mode and the number of pixel l...

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Abstract

A driving method for increasing the gray scale, which adds a pulse width modulation mode to the frame frequency modulation mode, and sets the pulse width modulation mode on a common driving circuit, and uses a horizontal synchronous signal to adjust and segment the pulse The number of time periods required by the width modulation mode, changing the number of horizontal synchronization signals within a frame time to cut its frame period, so that the length of time the pulse width modulation mode lights up pixels can be designed in the control circuit, thereby changing a frame The length of the lighting time within, does not require a special drive circuit.

Description

technical field [0001] The present invention relates to a driving method for increasing the gray scale, and relates to the gray scale driving technology of a liquid crystal display device, in particular to a driving method for adding a pulse width modulation (PWM) mode to a frame frequency modulation (FRM) mode . Background technique [0002] Liquid crystal is an organic compound between solid and liquid. It is also a compound with regular molecular arrangement. When heated, it will become a transparent liquid, and when it is cooled, it will become a crystalline turbid solid. Therefore, it is called liquid crystal. Due to the basic characteristics of liquid crystals, the basic principle of liquid crystal displays is to seal the liquid crystal in a glass box, and then apply electrodes to make it produce cold and heat changes, thus affecting its light transmission to achieve the effect of brightening and dimming. [0003] Common liquid crystal displays (LCD) are divided into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
Inventor 林嘉郎张育诚
Owner SITRONIX TECH CORP
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