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Gamma resistance regulating device, drive circuit and display device

A resistance adjustment and display device technology, applied in circuits, resistance elements including multiple resistance elements, resistors, etc., can solve the problems of inability to adjust, difficult to manage, and the problem of image quality cannot be significantly improved. Image quality effect, cost saving, gamma curve smoothing effect

Active Publication Date: 2013-07-24
HEFEI BOE OPTOELECTRONICS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method can only adjust the grayscale voltages of a few nodes, and most of the other voltages are controlled by built-in gamma resistors, which cannot be adjusted, and the image quality problem cannot be significantly improved.
[0004] In the prior art, the gamma curve of the display device can also be adjusted by changing the built-in gamma resistor, but different built-in gamma resistors are required to correspond to different display panels, which will easily cause too many versions of the source driver integrated circuit, which is not easy manage

Method used

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  • Gamma resistance regulating device, drive circuit and display device
  • Gamma resistance regulating device, drive circuit and display device
  • Gamma resistance regulating device, drive circuit and display device

Examples

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Embodiment 1

[0034] Please refer to figure 2 , figure 2 It is a schematic structural diagram of a gamma resistance adjustment device according to Embodiment 1 of the present invention. The gamma resistance adjustment device is applied to a source driver integrated circuit, including:

[0035] The built-in resistor string includes a plurality of gamma resistors Rs connected in series, wherein the gamma resistor Rs can adjust its resistance value under the control of a control signal. Wherein, the number of the gamma resistors Rs connected in series is related to the color scale of the display panel corresponding to the source driving integrated circuit, for example, when the number of gray scales of the display panel corresponding to the source driving integrated circuit is n, the series The number of gamma resistors Rs connected in series is 2n+1. For example, when the grayscale of the display panel corresponding to the source driver integrated circuit is 64, the number of gamma resisto...

Embodiment 2

[0040] Please refer to image 3 , image 3 It is a schematic structural diagram of the built-in resistor string in Embodiment 2 of the present invention, wherein the built-in resistor string includes 2n+1 gamma resistors Rs connected in series, and 2n voltage dividing nodes G1-G2n, where n is the grayscale of the display panel Order. In the figure, AVDD is the analog voltage for powering the gamma resistor Rs.

[0041] Please refer to Figure 4 , Figure 4 It is a schematic structural diagram of a gamma resistor according to Embodiment 2 of the present invention, wherein each gamma resistor Rs includes:

[0042] A base value resistor R0, m adjustment resistors R1~Rm, and m control switches S1~Sm corresponding to the m adjustment resistors R1~Rm one-to-one, wherein the base value resistor R0 and the m adjustment resistors R1 ~Rm are connected in series, and each control switch is connected in parallel with the corresponding adjustment resistor, wherein the value of m can b...

Embodiment 3

[0048] Please refer to Figure 5 , Figure 5 It is a schematic structural diagram of a source driver integrated circuit according to Embodiment 3 of the present invention. The source driver integrated circuit includes a serial to parallel converter (Serial to Parallel Converter), a shift register (Shift Register), a latch (Latch), a digital-to-analog conversion device (D / A Converter) and output buffer (Output Buffer). The working mode of the source driver integrated circuit is: after the serial-to-parallel converter receives the input digital video signal, it performs serial-to-parallel conversion on the digital video signal to obtain the converted digital video signal, and converts the converted digital video signal to output to a shift register; the shift register performs shift processing on the converted digital video signal to obtain a shifted digital video signal, and outputs the shifted digital video signal to a latch; latch The device performs latch processing on the...

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Abstract

The invention provides a gamma resistance regulating device, a drive circuit and a display device. The gamma resistance regulating device is applied to a source drive integrated circuit and comprises an internal resistance string, a control signal generating unit and a regulating unit, wherein the internal resistance string comprises a plurality of gamma resistors connected in series, and the gamma resistors can regulate the resistance thereof under control of a control signal; the control signal generating unit is used for receiving an internal resistance change data containing the resistance regulation information of each gamma resistor and generating a control signal direct to each gamma resistor according to the internal resistance change data; and the regulating unit is used for regulating the resistance of each gamma resistor according to the generated control signal. The gamma resistance regulating device disclosed by the invention can conveniently and quickly regulate the gamma curve of the display device, and has low implementation cost.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a gamma resistance adjustment device, a driving circuit and a display device. Background technique [0002] At present, in order to simplify the circuit design of printed circuit boards (Printed Circuit Board,) or flexible circuit boards, and to save costs, many small-size display devices directly use the built-in Gamma resistance in the source driver integrated circuit (Source IC). the design of. However, if the built-in gamma resistor does not match the display panel (Panel), it will cause the gray scale displayed on the display panel to be unsmooth, the gamma curve will not be smooth, and the image quality of the display panel will be poor. [0003] In the prior art, the gamma curve of the display device can be adjusted through the design of an external gamma resistor. Such as figure 1 Shown is a schematic diagram of the structure of an external gamma resistor in the prior...

Claims

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Application Information

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IPC IPC(8): G09G3/20
CPCG09G3/3688G09G3/3696G09G2320/0276G09G2320/0673G09G3/2007G09G2310/08H01C10/16H01C10/50
Inventor 冯霞何剑黄家成
Owner HEFEI BOE OPTOELECTRONICS TECH
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