CN108962180B - Gamma switching circuit and liquid crystal display device - Google Patents
Gamma switching circuit and liquid crystal display device Download PDFInfo
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- CN108962180B CN108962180B CN201811097514.8A CN201811097514A CN108962180B CN 108962180 B CN108962180 B CN 108962180B CN 201811097514 A CN201811097514 A CN 201811097514A CN 108962180 B CN108962180 B CN 108962180B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
The invention provides a gamma switching circuit, which comprises a first switch element, a second switch element, a first resistor string and a second resistor string. When the mode switching voltage in the first display mode enables the first switch element to be conducted and the second switch element to be disconnected, the first resistor string is connected with the power supply end, and the first voltage node outputs a first group of gamma voltages to the source electrode driving circuit; the mode switching voltage in the second display mode turns off the first switch and turns on the second switch element, so that the second resistor string is connected to the power supply terminal, and the second voltage node outputs the second group of gamma voltages to the source driving circuit. The invention also provides a liquid crystal display device. The gamma switching circuit and the liquid crystal display device select one group of the external resistor strings to be connected with the power supply end through the mode switching voltage switching in the corresponding mode to generate the required group of gamma voltages, and have the advantages of no need of burning, simple circuit element selection, low cost and the like.
Description
Technical Field
The present invention relates to the field of liquid crystal display, and more particularly, to a gamma switching circuit and a liquid crystal display device.
Background
Liquid Crystal Display (LCD) devices have the advantages of good picture quality, small size, light weight, low driving voltage, low power consumption, no radiation, relatively low manufacturing cost, and the like, and currently dominate the flat panel Display field. It is widely used in a variety of office automation and audio-visual devices such as desktop computers, palm top computers, Personal Digital Assistants (PDAs), cellular phones, tv boxes, and the like.
The display device includes a display panel, a display panel driving board, a backlight module including at least one light emitting diode string, and a Light Emitting Diode (LED) driving board. The display panel driving board is provided with a gamma voltage generating circuit for providing a plurality of gamma voltages to the source driving circuit, so that the source driving circuit outputs a plurality of data signals to corresponding pixel units in the display panel.
At present, the demand for the picture quality of the lcd devices is increasing, and the lcd devices often need to operate in different display modes, such as wide viewing angle, narrow viewing angle, etc., and require different sets of gamma voltages in different display modes. However, the gamma voltage generating circuit in the conventional source driving circuit can only generate one set of gamma voltages, and the use of one set of gamma voltages in different display modes can cause display deviation, so an external circuit is required to provide two sets of gamma voltages. In the prior art, a programmable Gamma buffer (P-Gamma) chip is used in an external circuit to generate two sets of Gamma voltages, however, the use of the programmable Gamma buffer (P-Gamma) chip can cause the problems of higher unit price of the chip, software burning damage, higher burning time cost of manufacturers, higher cost caused by more external elements, and the like.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
Accordingly, the present invention is directed to a Gamma switching circuit, which solves the problems caused by using a programmable Gamma buffer (P-Gamma) chip by providing a Gamma switching circuit external to a source driving circuit.
Specifically, the invention provides a gamma switching circuit, which comprises a first switching element, a second switching element, a first resistor string and a second resistor string. The first switch element comprises a first control end, a first power receiving end and a first output end, the first control end of the first switch element receives the mode switching voltage, and the first power receiving end of the first switch element is connected with the power supply end; the second switch element comprises a second control end, a second power receiving end and a second output end, the second control end of the second switch element receives the mode switching voltage, and the second power receiving end of the second switch element is connected with the power supply end; the first resistor string is formed by connecting n +1 resistors in series and comprises n first voltage nodes, the first end of the first resistor string is connected with the first output end of the first switching element, the second end of the first resistor string is grounded, and n is an integer greater than or equal to 1; the second resistor string is formed by connecting n +1 resistors in series and comprises n second voltage nodes, the first end of the second resistor string is connected with the second output end of the second switch element, and the second end of the second resistor string is grounded; when the mode switching voltage in the first display mode enables the first switch element to be conducted and the second switch element to be disconnected, the first resistor string is connected with the power supply end, and the first voltage node outputs a first group of gamma voltages to the source electrode driving circuit; the mode switching voltage in the second display mode causes the first switch element to be turned off and the second switch element to be turned on, so that the second resistor string is connected to the power supply terminal, and the second voltage node outputs the second group of gamma voltages to the source driving circuit.
Preferably, the mode switching voltage in the first display mode is at a high level, and the mode switching voltage in the second display mode is at a low level.
Preferably, the first switching element is an NMOS transistor, and the second switching element is a PMOS transistor.
Preferably, the gamma switching circuit includes a first voltage dividing resistor and a second voltage dividing resistor, a first terminal of the first voltage dividing resistor is connected to the first control terminal of the first switching element, a second terminal of the first voltage dividing resistor receives the mode switching voltage, a first terminal of the second voltage dividing resistor is connected to the second control terminal of the second switching element, and a second terminal of the second voltage dividing resistor receives the mode switching voltage.
Preferably, the gamma switching circuit includes a third voltage dividing resistor, a first terminal of the third voltage dividing resistor is connected to the power supply terminal, and a second terminal of the third voltage dividing resistor is connected to both the first power receiving terminal of the first switching element and the second power receiving terminal of the second switching element.
Preferably, the gamma switching circuit includes 2n operational amplifiers, and the first voltage node of the first resistor string and the second voltage node of the second resistor string are connected to the source driving circuit through the respective operational amplifiers.
Preferably, the operational amplifier is an output buffer.
Preferably, said n has a value of 14.
Preferably, the first display mode is a narrow viewing angle display mode, and the second display mode is a wide viewing angle display mode.
The invention also provides a liquid crystal display device which comprises the gamma switching circuit.
According to the gamma switching circuit and the liquid crystal display device, the gamma switching circuit is built outside the source electrode driving circuit, one group of the external resistor strings is switched and selected to be connected with the power supply end through the mode switching voltage in the corresponding mode so as to generate the needed group of gamma voltages, and the gamma switching circuit and the liquid crystal display device have the advantages of being free of burning, simple in circuit element selection, low in cost and the like.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a circuit connection diagram of a gamma switching circuit according to an embodiment.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given to specific embodiments, methods, steps, structures, features and effects of the gamma switching circuit and the liquid crystal display device according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.
First embodiment
Referring to fig. 1, fig. 1 is a circuit connection diagram of a gamma switching circuit according to an embodiment. As shown in fig. 1, the gamma switching circuit of the present embodiment includes a first switching element T1, a second switching element T2, a first resistor string 10, and a second resistor string 20. The first switching element T1 includes a first control terminal, a first power receiving terminal, and a first output terminal, the first control terminal of the first switching element T1 receives the mode switching voltage Vk, and the first power receiving terminal of the first switching element T1 is connected to the power supply terminal AVDD. The second switching element T2 includes a second control terminal, a second power receiving terminal, and a second output terminal, the second control terminal of the second switching element T2 receives the mode switching voltage Vk, and the second power receiving terminal of the second switching element T2 is connected to the power supply terminal AVDD.
The first resistor string 10 includes n +1 resistors connected in series, and includes n first voltage nodes, that is, a first voltage node is disposed between two adjacent resistors of the first resistor string 10, and the first voltage node is connected to the source driver circuit, where n is an integer greater than or equal to 1. The second resistor string 20 includes n +1 resistors connected in series, and includes n second voltage nodes, that is, a second voltage node is disposed between two adjacent resistors of the second resistor string 20, and the second voltage node is connected to the source driver circuit. A first terminal of the first resistor string 10 is connected to a first output terminal of the first switching element T1, and a second terminal of the first resistor string 10 is grounded. The first terminal of the second resistor string 20 is connected to the second output terminal of the second switching element T2, and the second terminal of the second resistor string 20 is grounded. In an embodiment, n may take a value of 14, and referring to fig. 1, the first resistor string 10 may include 15 resistors (R1 and R2 … … R15 in fig. 1) connected in series and include 14 first voltage nodes, and the 14 first voltage nodes are connected to a source driving circuit (not shown in fig. 1) for providing a corresponding first set of gamma voltages. A first end of the first resistor string 10 is connected to a first output end of the first switching element T1, and a second end of the first resistor string 10 is grounded; the second resistor string 20 may include 15 resistors (R1 ', R2 ' … … R15 ' in fig. 1) connected in series and includes 14 second voltage nodes, and the 14 second voltage nodes are connected to the source driving circuit for providing the corresponding second set of gamma voltages. The first terminal of the second resistor string 20 is connected to the second output terminal of the second switching element T2, and the second terminal of the second resistor string 20 is grounded.
Those skilled in the art will understand that the numbers of resistors included in the first resistor string 10 and the second resistor string 20 can be set as required to set the gamma voltage numbers of the first set of gamma voltages and the second set of gamma voltages respectively; the resistance values of the resistors of the first resistor string 10 and the second resistor string 20 may be set as required to set the gamma voltage values of the first group of gamma voltages and the gamma voltage values of the second group of gamma voltages, respectively.
When the mode switching voltage Vk in the first display mode turns on the first switch element T1 and turns off the second switch element T2, the first resistor string 10 is connected to the power supply terminal AVDD, and the first voltage node outputs the first set of gamma voltages to the source driver circuit; when the mode switching voltage Vk in the second display mode turns off the first switch and turns on the second switch element T2, the second resistor string 20 is connected to the power supply terminal AVDD, and the second voltage node outputs the second set of gamma voltages to the source driver circuit.
Specifically, in the first display mode, the first control terminal of the first switching element T1 and the second control terminal of the second switching element T2 both receive the mode switching voltage Vk, wherein the first switching element T1 turns on the connection of the power supply terminal AVDD to the first terminal of the first resistor string 10 according to the mode switching voltage Vk in the first display mode, and the second switching element T2 turns off the connection of the power supply terminal AVDD to the first terminal of the second resistor string 20 according to the mode switching voltage Vk in the first display mode, so that the power supply terminal AVDD supplies the power supply voltage to only the first resistor string 10 of the two resistor strings. The first resistor string 10 is connected in series between the power supply terminal AVDD and ground, and n first gamma voltages (i.e., a first set of gamma voltages) can be obtained by dividing the n first voltage nodes of the first resistor string 10 according to the resistors and output to the connected source driving circuit, so that the source driving circuit obtains the first set of gamma voltages.
In the second display mode, the first control terminal of the first switching element T1 and the second control terminal of the second switching element T2 both receive the mode switching voltage Vk, wherein the first switching element T1 disconnects the power supply terminal AVDD from the first terminal of the first resistor string 10 according to the mode switching voltage Vk in the second display mode, and the second switching element T2 disconnects the power supply terminal AVDD from the first terminal of the second resistor string 20 according to the mode switching voltage Vk in the second display mode, so that the power supply terminal AVDD supplies the power supply voltage to only the second resistor string 20 of the two resistor strings. The second resistor string 20 is connected in series between the power supply terminal AVDD and ground, and the n second voltage nodes of the second resistor string 20 may obtain n second gamma voltages (i.e., a second group of gamma voltages) according to the resistance voltage division and output the n second gamma voltages to the connected source driving circuit, so that the source driving circuit obtains the second group of gamma voltages.
Therefore, the gamma switching circuit of the embodiment can switch and turn on the first switch device T1 to connect the first resistor string 10 to the power supply terminal AVDD to generate the required first set of gamma voltages or turn on the second switch device T2 to connect the second resistor string 20 to the power supply terminal AVDD to generate the required second set of gamma voltages by the mode switching voltage Vk in the corresponding mode.
The two switching elements T1 and T2 are turned on and off in opposite directions according to the display mode switching voltage Vk, i.e., the mode switching voltage Vk is the on voltage of one switching element and the off voltage of the other switching element. In one embodiment, the mode switching voltage Vk in the first display mode may be at a high level, and the mode switching voltage Vk in the second display mode may be at a low level. In an embodiment, the first switching element T1 may be an NMOS transistor, and the second switching element T2 may be a PMOS transistor, but the invention is not limited thereto, and in other embodiments, the first switching element T1 may also be an N-type TFT transistor, an NPN transistor, or the like, and the second switching element T2 may also be a P-type TFT transistor, a PNP transistor, or the like. Taking the first switch element T1 as an NMOS transistor and the second switch element T2 as a PMOS transistor for example, in a display mode, the mode switching signal causes the two switch elements T1 and T2 to perform opposite on/off operations, for example, in the first display mode, the mode switching voltage Vk (which may be high level) causes the first switch element T1 to be turned on and the second switch element T2 to be turned off; in the second display mode, the mode switching voltage Vk (which may be low) turns off the first switching element T1 and turns on the second switching element T2.
In one embodiment, the gamma switching circuit includes a first voltage-dividing resistor R16 and a second voltage-dividing resistor R16 ', a first terminal of the first voltage-dividing resistor R16 is connected to a first control terminal of the first switching element T1, a second terminal of the first voltage-dividing resistor R16 receives the mode-switching voltage Vk, a first terminal of the second voltage-dividing resistor R16 ' is connected to a second control terminal of the second switching element T2, and a second terminal of the second voltage-dividing resistor R16 ' receives the mode-switching voltage Vk. Accordingly, the first control terminal of the first switching element T1 may receive the mode switching voltage Vk through the first voltage dividing resistor R16, and the second control terminal of the second switching element T2 may receive the mode switching voltage Vk through the second voltage dividing resistor R16'.
In one embodiment, the gamma switching circuit includes a third voltage dividing resistor R17, a first terminal of the third voltage dividing resistor R17 is connected to the power supply terminal AVDD, and a second terminal of the third voltage dividing resistor R17 is connected to both the first power receiving terminal of the first switching element T1 and the second power receiving terminal of the second switching element T2. Thus, the power supply terminal AVDD may be connected to the first switching element T1 and the second switching element T2 through the corresponding third voltage dividing resistors R17, respectively.
In one embodiment, the gamma switching circuit includes 2n operational amplifiers, and the first voltage node of the first resistor string 10 and the second voltage node of the second resistor string 20 are connected to the source driving circuit through the respective operational amplifiers. In one embodiment, the gamma switching circuit includes 28 operational amplifiers 2X14, such as D1, D2 … … D14 and D1 ' and D2 ' … … D14 ' in fig. 1, a first voltage node between the 1 st resistor R1 and the 2 nd resistor R2 of the first resistor string 10 may be connected to the source driving circuit through a corresponding operational amplifier D1, a first voltage node between the 2 nd resistor R2 and the 3 rd resistor R3 may be connected to the source driving circuit through a corresponding operational amplifier D2, and so on, the connection settings of other first voltage nodes of the first resistor string 10 are the same, and similarly, the connection setting of the second voltage node of the second resistor string 20 is the same as that of the first resistor string 10. The operational amplifier can perform operations such as corresponding voltage output buffering or voltage proportional amplification on the first gamma voltage on the corresponding first voltage node and the second gamma voltage on the corresponding second voltage node. In one embodiment, the operational amplifier may serve as an output buffer, and the amplification factor of the operational amplifier may be 1, that is, the operational amplifier does not function to amplify voltage, but functions to isolate, match impedance, and enhance the output capability of the circuit.
In one embodiment, the first display mode may be a narrow viewing angle display mode, and the second display mode may be a wide viewing angle display mode.
The gamma switching circuit of the embodiment is built outside the source electrode driving circuit, and one group of the external resistor strings is switched and selected to be connected with the power supply end AVDD through the mode switching voltage Vk in the corresponding mode to generate a needed group of gamma voltages.
Second embodiment
The embodiment also provides a liquid crystal display device, which comprises the gamma switching circuit.
In one embodiment, the first display mode may be a narrow viewing angle display mode, and the second display mode may be a wide viewing angle display mode. Also, in one embodiment, the mode switching voltage Vk in the first display mode may be a high level to drive the gamma switching circuit to connect the first resistor string 10 to the power supply terminal AVDD through the turned-on first switching element T1, the first voltage node of the first resistor string 10 outputting the first set of gamma voltages to the source driving circuit, and the mode switching voltage Vk in the second display mode may be a low level to drive the gamma switching circuit to connect the second resistor string 20 to the power supply terminal AVDD through the turned-on second switching element T2, the second voltage node of the second resistor string 20 outputting the second set of gamma voltages to the source driving circuit.
In the liquid crystal display device of the embodiment, the gamma switching circuit is built outside the source electrode driving circuit, and one group of the external resistor strings is switched and selected to be connected with the power supply end AVDD through the mode switching voltage Vk in the corresponding mode to generate a required group of gamma voltages.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A gamma switching circuit comprising a first switching element (T1), a second switching element (T2), a first resistor string (10), and a second resistor string (20);
the first switching element (T1) comprises a first control terminal, a first power receiving terminal and a first output terminal, the first control terminal of the first switching element (T1) receives the mode switching voltage (Vk), and the first power receiving terminal of the first switching element (T1) is connected to the power supply terminal (AVDD);
the second switching element (T2) comprises a second control terminal, a second power receiving terminal and a second output terminal, the second control terminal of the second switching element (T2) receives the mode switching voltage (Vk), and the second power receiving terminal of the second switching element (T2) is connected to the power supply terminal (AVDD);
the first resistor string (10) is formed by connecting n +1 resistors in series and comprises n first voltage nodes, a first end of the first resistor string (10) is connected with a first output end of the first switch element (T1), a second end of the first resistor string (10) is grounded, and n is an integer greater than or equal to 1;
the second resistor string (20) is formed by connecting n +1 resistors in series and comprises n second voltage nodes, a first end of the second resistor string (20) is connected with a second output end of the second switch element (T2), and a second end of the second resistor string (20) is grounded;
wherein, in the first display mode, the mode switching voltage (Vk) turns on the first switch element (T1) and turns off the second switch element (T2), so that the first resistor string (10) is connected to the power supply terminal (AVDD), and the first voltage node outputs the first set of gamma voltages to the source driver circuit; when the mode switching voltage (Vk) in the second display mode turns off the first switching element (T1) and turns on the second switching element (T2), the second resistor string (20) is connected to the power supply terminal (AVDD), and the second voltage node outputs the second set of gamma voltages to the source driver circuit.
2. The gamma switching circuit according to claim 1, wherein the mode switching voltage (Vk) in the first display mode is at a high level, and the mode switching voltage (Vk) in the second display mode is at a low level.
3. The gamma switching circuit according to claim 1, wherein the first switching element (T1) is an NMOS transistor and the second switching element (T2) is a PMOS transistor.
4. The gamma switching circuit according to claim 1, wherein the gamma switching circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, a first terminal of the first voltage dividing resistor is connected to the first control terminal of the first switching element (T1), a second terminal of the first voltage dividing resistor receives the mode switching voltage (Vk), a first terminal of the second voltage dividing resistor is connected to the second control terminal of the second switching element (T2), and a second terminal of the second voltage dividing resistor receives the mode switching voltage (Vk).
5. The gamma switching circuit according to claim 1, wherein the gamma switching circuit includes a third voltage dividing resistor, a first terminal of the third voltage dividing resistor being connected to the power supply terminal (AVDD), and a second terminal of the third voltage dividing resistor being connected to both the first power receiving terminal of the first switching element (T1) and the second power receiving terminal of the second switching element (T2).
6. The gamma switching circuit according to claim 1, wherein the gamma switching circuit comprises 2n operational amplifiers, and the first voltage node of the first resistor string (10) and the second voltage node of the second resistor string (20) are connected to the source driver circuit through the respective operational amplifiers.
7. The gamma switching circuit of claim 6, wherein the operational amplifier is an output buffer.
8. The gamma switching circuit of claim 1, wherein the value of n is 14.
9. The gamma switching circuit of claim 1, wherein the first display mode is a narrow viewing angle display mode and the second display mode is a wide viewing angle display mode.
10. A liquid crystal display device including a gate driver circuit, characterized in that the liquid crystal display device includes the gamma switching circuit according to any one of claims 1 to 9.
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| CN109658899B (en) * | 2019-02-28 | 2021-01-29 | 昆山龙腾光电股份有限公司 | Voltage switching circuit, gamma voltage generating circuit and liquid crystal display device |
| CN112071280B (en) * | 2020-09-22 | 2022-05-31 | 禹创半导体(深圳)有限公司 | Fast gamma switching method |
| CN113129848B (en) * | 2021-03-18 | 2023-03-21 | 惠科股份有限公司 | Gamma voltage regulating circuit and gamma circuit |
| CN113707068B (en) * | 2021-08-26 | 2023-12-05 | 京东方科技集团股份有限公司 | Display panel power supply circuit, power supply method and display device |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7388592B2 (en) * | 2003-01-30 | 2008-06-17 | Richtek Technology Corp. | Gamma voltage generator and method thereof for generating individually tunable gamma voltages |
| CN101311782A (en) * | 2007-05-25 | 2008-11-26 | 奇美电子股份有限公司 | Gray scale voltage generation circuit and its operation method |
| CN101609654A (en) * | 2008-06-17 | 2009-12-23 | 三星电子株式会社 | Data driver and display device |
| CN101770742A (en) * | 2008-12-30 | 2010-07-07 | 东部高科股份有限公司 | Display device and source line driving method thereof |
| CN104062809A (en) * | 2013-03-22 | 2014-09-24 | 刘鸿达 | Dual-display mode liquid crystal display |
| CN104064137A (en) * | 2013-03-21 | 2014-09-24 | 索尼公司 | Gray-scale Voltage Generating Circuit And Display Unit |
| CN104091575A (en) * | 2014-06-26 | 2014-10-08 | 京东方科技集团股份有限公司 | Gamma voltage generating circuit, generating method and data driver |
| CN205384863U (en) * | 2016-02-05 | 2016-07-13 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal disply device |
| CN106409256A (en) * | 2016-11-03 | 2017-02-15 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal display device |
| CN108206040A (en) * | 2016-12-19 | 2018-06-26 | 北京兆易创新科技股份有限公司 | A kind of electrification reset circuit |
| JP2018116133A (en) * | 2017-01-18 | 2018-07-26 | 三菱電機株式会社 | Grayscale reference voltage generation circuit, driving device for liquid crystal display device, and liquid crystal display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002366112A (en) * | 2001-06-07 | 2002-12-20 | Hitachi Ltd | Liquid crystal driving device and liquid crystal display device |
-
2018
- 2018-09-19 CN CN201811097514.8A patent/CN108962180B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7388592B2 (en) * | 2003-01-30 | 2008-06-17 | Richtek Technology Corp. | Gamma voltage generator and method thereof for generating individually tunable gamma voltages |
| CN101311782A (en) * | 2007-05-25 | 2008-11-26 | 奇美电子股份有限公司 | Gray scale voltage generation circuit and its operation method |
| CN101609654A (en) * | 2008-06-17 | 2009-12-23 | 三星电子株式会社 | Data driver and display device |
| CN101770742A (en) * | 2008-12-30 | 2010-07-07 | 东部高科股份有限公司 | Display device and source line driving method thereof |
| CN104064137A (en) * | 2013-03-21 | 2014-09-24 | 索尼公司 | Gray-scale Voltage Generating Circuit And Display Unit |
| CN104062809A (en) * | 2013-03-22 | 2014-09-24 | 刘鸿达 | Dual-display mode liquid crystal display |
| CN104091575A (en) * | 2014-06-26 | 2014-10-08 | 京东方科技集团股份有限公司 | Gamma voltage generating circuit, generating method and data driver |
| CN205384863U (en) * | 2016-02-05 | 2016-07-13 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal disply device |
| CN106409256A (en) * | 2016-11-03 | 2017-02-15 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal display device |
| CN108206040A (en) * | 2016-12-19 | 2018-06-26 | 北京兆易创新科技股份有限公司 | A kind of electrification reset circuit |
| JP2018116133A (en) * | 2017-01-18 | 2018-07-26 | 三菱電機株式会社 | Grayscale reference voltage generation circuit, driving device for liquid crystal display device, and liquid crystal display device |
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| CN108962180A (en) | 2018-12-07 |
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