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Gamma voltage drive circuit and related display device

A technology of gamma voltage and drive circuit, applied to static indicators, instruments, etc., which can solve the problems of increasing production cost of known display devices

Active Publication Date: 2015-05-20
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the known display device needs to use three gamma voltage driving circuits, the production cost of the known display device is thus increased.

Method used

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  • Gamma voltage drive circuit and related display device
  • Gamma voltage drive circuit and related display device
  • Gamma voltage drive circuit and related display device

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Embodiment Construction

[0065] Embodiments of the invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are illustrative only, and do not limit the scope of the invention.

[0066] Please refer to figure 2 , which is a schematic diagram illustrating a display device 200 according to an embodiment of the present invention. The display device 200 includes a display panel 210 , a timing controller (timing controller) 220 , a gate driver (gated driver) 230 , a source driver (source driver) 240 and a gamma voltage driving circuit 250 . The display panel 210 may be any type of liquid crystal display panel, such as a twisted nematic (TN) liquid crystal display panel or a vertical alignment (vertical alignment; VA) liquid crystal display panel, or an organic light emitting diode (organic light emitting diode) ; OLED) display ...

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PUM

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Abstract

The invention relates to a gamma voltage drive circuit and a related display device. The gamma voltage drive circuit is used for providing multiple gamma voltage and multiple reference voltage. The gamma voltage drive circuit comprises a voltage adjusting unit, a control unit and a gamma voltage output circuit, wherein the voltage adjusting unit is used for providing input voltage; the control unit is used for generating a reference signal and an adjusting signal; the gamma voltage output circuit is used for outputting the gamma voltage and the reference voltage. A gamma voltage generating circuit comprises a first resistor string and a plurality of voltage generating units. The first resistor string comprises a plurality of resistors which are serially connected and is used for providing multiple first output voltage according to the input voltage. The gamma voltage receiving units receive the first output voltage and the reference signal to generate the gamma voltage and the reference voltage.

Description

technical field [0001] The present invention relates to a gamma voltage driving circuit and a related display device, and in particular to a gamma voltage driving circuit including a gamma curve correction function and a related display device. Background technique [0002] The human eye's perception of grayscale changes in color is not distributed in a linear fashion. For example, the human eye is more sensitive to the gray level change of the low gray level picture than the gray level change of the high gray level picture. Therefore, the display device generally has a gamma curve (Gamma curve) correction function, so that the human eye has a linear relationship with the gray scale change of the color. Generally, a display device uses a gamma voltage and a reference voltage to perform gamma curve correction on input image data. Due to the relationship curve between red light gray scale data and brightness (that is, red gamma curve), the relationship curve between green li...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3225G09G3/3275
Inventor 曾伟凯
Owner HIMAX TECH LTD