Unlock instant, AI-driven research and patent intelligence for your innovation.

Gamma voltage switching device and liquid crystal display device

A technology of gamma voltage and switching device, which is applied to static indicators, instruments, etc., can solve the problem of grayscale inversion of the display screen, and achieve the effect of improving grayscale inversion.

Active Publication Date: 2020-08-04
KUSN INFOVISION OPTOELECTRONICS
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a gamma voltage switching device, which can solve the problem of grayscale inversion of the display screen that occurs when only two sets of gamma voltages are provided.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Gamma voltage switching device and liquid crystal display device
  • Gamma voltage switching device and liquid crystal display device
  • Gamma voltage switching device and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0020] Please refer to figure 1 , figure 1 The circuit connection diagram of the gamma voltage switching device provided for the first embodiment. like figure 1 As shown, the gamma voltage switching device of this embodiment includes a switching control circuit 100 and a voltage output circuit 200 . The switching control circuit 100 of this embodiment is configured to output switching signals according to the received first switching control signal S1 and second switching control signal S2 . The switching control circuit 100 of this embodiment includes a third switch element T3, a fourth switch element T4, a second resistor R2 and a third resistor R3. The third switch element T3 includes a third control terminal, a fifth channel terminal and a sixth channel terminal, the third control terminal of the third switch element T3 receives the first switching control signal S1, and the sixth channel terminal of the third switch element T3 is grounded . The fourth switch element ...

no. 2 example

[0037] figure 2 The circuit connection diagram of the gamma voltage switching device provided for the second embodiment. The second embodiment is basically the same as the first embodiment, except that the switching control circuit 100 includes a fifth switching element T5 , a sixth switching element T6 , a seventh switching element T7 , a fourth resistor R4 and a fifth resistor R5 . The fifth switch element T5 includes a fifth control terminal, a ninth channel terminal and a tenth channel terminal, the fifth control terminal of the fifth switch element T5 receives the first switching control signal S1, and the tenth channel terminal of the fifth switch element T5 is grounded . The sixth switch element T6 includes a sixth control terminal, an eleventh channel terminal and a twelfth channel terminal, the sixth control terminal of the sixth switch element T6 receives the second switching control signal S2, and the twelfth channel terminal of the sixth switch element T6 The pa...

no. 3 example

[0049] This embodiment also provides a liquid crystal display device, which includes the above-mentioned gamma voltage switching device.

[0050] The liquid crystal display device of this embodiment can provide three sets of gamma voltages to the source driving circuit, and can switch the three sets of gamma voltages in real time, thereby improving the gray scale inversion phenomenon.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a gamma voltage switching device. The gamma voltage switching device comprises a switching control circuit and a voltage output circuit; the switching control circuit is configured to output a switching signal according to a received first switching control signal and a received second switching control signal; the voltage output circuit comprises a first resistor string, aplurality of first switching elements, a second switching element and a gamma voltage chip; the gamma voltage chip outputs a second group of gamma voltages or a third group of gamma voltages accordingto a level of the first switching control signal, and the gamma voltage chip stops outputting the second group of gamma voltages or the third group of gamma voltages when the switching signal is an active level; all the first switching elements are turned on, so that the first resistor string outputs a first group of gamma voltages to a source drive circuit. The invention also provides a liquid crystal display device. The gamma voltage switching device and the liquid crystal display device of the invention can provide three groups of gamma voltages to the source driving circuit, and switch three groups of gamma voltages in real time, thereby preventing gray scale inversion.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a gamma voltage switching device and a liquid crystal display device. Background technique [0002] Liquid Crystal Display (LCD) has the advantages of good image quality, small size, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, etc., and currently occupies a dominant position in the field of flat panel display. It is widely used in various office automation and audio-visual equipment such as desktop computers, palmtop computers, personal digital assistants (Personal Digital Assistant, PDA), portable phones, and television boxes. [0003] At present, the demand for picture quality of liquid crystal display devices is getting higher and higher. However, the source driving circuit of the prior art liquid crystal display device can only switch between two sets of gamma voltages, and the grayscale inversion of the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G3/3648G09G3/3696G09G2310/0235G09G2320/0242G09G2320/0276G09G2320/0285G09G2320/0673G09G2320/0693
Inventor 姜飞田申卢佳惠王铮
Owner KUSN INFOVISION OPTOELECTRONICS