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Gamma voltage switching device and liquid crystal display device

A technology of gamma voltage and switching device, applied in 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: 2018-10-19
KUSN INFOVISION OPTOELECTRONICS
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  • 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

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  • 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. Such as 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 a switching signal according to the received first switching control signal S1 and the second switching control signal S2. The switching control circuit 100 of this embodiment includes a third switching element T3, a fourth switching element T4, a second resistor R2, and a third resistor R3. The third switching element T3 includes a third control terminal, a fifth path terminal, and a sixth path terminal. The third control terminal of the third switching element T3 receives the first switching control signal S1, and the sixth path terminal of the third switching element T3 is grounded. . The fourth swit...

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 pat...

no. 3 example

[0050] This embodiment also provides a liquid crystal display device, which includes the gamma voltage switching device described above.

[0051] 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 phenomenon of gray scale inversion.

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PUM

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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. It currently plays a dominant role in the field of flat panel displays. It is widely used in desktop computers, palmtop computers, personal digital assistants (Personal Digital Assistant, PDA), portable phones, TV boxes and other office automation and audio-visual equipment. [0003] Currently, the demand for the image quality of the liquid crystal display device is increasing. However, the source driving circuit of the liquid crystal display device in the prior art can only switch between two groups of gamma voltages, and problems such as gray scale inversion may occur on the screen. Summar...

Claims

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Application Information

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Patent Type & Authority Applications(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