Gray scale voltage generating circuit and method, source driver IC and liquid crystal display (LCD) device

A technology of a source driver chip and a liquid crystal display device, which is applied in the fields of a source driver chip, a gray-scale voltage generating circuit, and a liquid crystal display device, and can solve problems such as lowering picture quality, increasing cost and difficulty in circuit design, and gray-scale loss. Achieve the effects of avoiding gray scale loss, low cost and circuit design difficulty, and low cost

Active Publication Date: 2012-09-19
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problems to be solved by the present invention include, when using a backlight unit with dynamically changing brightness in the existing liquid crystal display technology, it may cause loss of gray scale, reduce picture quality, or must use P-gamma circuit, cost and circuit design To solve the problem of increased difficulty, provide a liquid crystal display technology that can avoid the loss of gray scale, and has low cost and circuit design difficulty

Method used

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  • Gray scale voltage generating circuit and method, source driver IC and liquid crystal display (LCD) device
  • Gray scale voltage generating circuit and method, source driver IC and liquid crystal display (LCD) device
  • Gray scale voltage generating circuit and method, source driver IC and liquid crystal display (LCD) device

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Embodiment 1

[0039] This embodiment provides a grayscale voltage generation circuit, including:

[0040] A voltage dividing circuit for dividing a plurality of gamma reference voltages to generate a plurality of grayscale voltages.

[0041] A plurality of output branches connected to different positions of the voltage divider circuit and output respective gray scale voltages.

[0042] A plurality of access terminals connected to the voltage divider circuit and used to respectively connect the gamma reference voltages; wherein at least one access terminal is connected to multiple different positions of the voltage divider circuit through multiple access branches, and Each access branch has a switch for turning on or cutting off the access branch.

[0043] The control unit used to control the switch on and off.

[0044] In the gray-scale voltage generating circuit of this embodiment, the gamma reference voltage is connected to multiple different positions of the voltage divider circuit thr...

Embodiment 2

[0046] This embodiment provides a grayscale voltage generation circuit, such as image 3 shown, which includes:

[0047] 1) For multiple gamma reference voltages V 1 ~V m Divide the voltage to generate multiple gray scale voltages G 0 ~G n The voltage divider circuit 1; preferably, the voltage divider circuit 1 is composed of a plurality of series voltage divider resistors R 1 ~R q composition.

[0048] 2) Connected to different positions of the voltage divider circuit 1 to output gray-scale voltages G 0 ~G n Multiple output branches of 2. Wherein, each output branch 2 can be connected to both ends of the voltage dividing circuit 1, that is, each voltage dividing resistor R in the voltage dividing circuit 1 1 ~R q between positions, the gamma reference voltage V 1 ~V m are divided by each resistor R 1 ~R q Divide the voltage, so as to generate the required gray-scale voltage G in each output branch 2 0 ~G n . image 3 , the two ends of the voltage divider circ...

Embodiment 3

[0059] This embodiment provides a source driver chip, which includes the above-mentioned gray scale voltage generating circuit. That is to say, the above-mentioned grayscale voltage generation circuit can be integrated into the source driver chip, so as to facilitate circuit design and reduce product cost.

[0060] Since the source driver chip of this embodiment has the above-mentioned gray scale voltage generating circuit, it can avoid gray scale loss, and the cost and difficulty of circuit design are low.

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PUM

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Abstract

The invention provides a gray scale voltage generating circuit and a method, a source driver IC and an LCD device, belongs to the LCD technical field, and can solve the problems of gray scale losses or increased cost and circuit design difficulty caused when a backlight unit with dynamic changes in brightness is used in the existing LCD technique. The gray scale voltage generating circuit comprises a voltage-dividing circuit, a plurality of output branches, a plurality of accessing ends and a control unit, wherein the voltage-dividing circuit is used for dividing a plurality of gamma reference voltages so as to generate a plurality of gray scale voltages; the output branches are connected with different positions of the voltage-dividing circuit and are used for outputting the gray scale voltages; the accessing ends are connected with the voltage-dividing circuit and are used for connecting the gamma reference voltages, and at least one accessing end is connected to a plurality of positions of the voltage-dividing circuit through a plurality of accessing branches which are provided with switches; and the control unit is used for controlling the switches. The gray scale voltage generating circuit can be applied to the LCD device of the backlight unit with dynamic changes in brightness.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and in particular relates to a grayscale voltage generation circuit and method, a source driver chip, and a liquid crystal display device. Background technique [0002] With the development of technology, liquid crystal display devices are more and more widely used. like figure 1 As shown, the liquid crystal display device includes a timing controller, a gamma reference voltage unit, a source driver chip, a gate driver chip, a backlight unit, a display panel unit and the like. like figure 2 As shown, the gamma reference voltage unit generates multiple gamma reference voltages V 1 ~V m , the source driver chip includes multiple series-connected divider resistors R 1 ~R q Composed of a voltage divider circuit, each gamma reference voltage V 1 ~V m Connect to different positions of the voltage divider circuit respectively, the adjacent gamma reference voltage V 1 ~~V m thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36
CPCG09G3/36G09G3/3696G09G3/3685
Inventor 黄家成何剑聂春扬
Owner BOE TECH GRP CO LTD
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