CN109559690B - Gamma voltage generating circuit, method and liquid crystal display device - Google Patents
Gamma voltage generating circuit, method and liquid crystal display device Download PDFInfo
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- CN109559690B CN109559690B CN201811471785.5A CN201811471785A CN109559690B CN 109559690 B CN109559690 B CN 109559690B CN 201811471785 A CN201811471785 A CN 201811471785A CN 109559690 B CN109559690 B CN 109559690B
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Abstract
The invention discloses a gamma voltage generating circuit, a method and a liquid crystal display device. The control module outputs a first voltage conversion instruction according to the first display mode control signal or outputs a second voltage conversion instruction according to the second display mode control signal; the voltage conversion module converts the working voltage into a first direct-current voltage according to the first voltage conversion instruction and sends the first direct-current voltage to a gamma correction circuit in the source electrode driving circuit, or converts the working voltage into a second direct-current voltage according to a second voltage conversion instruction, wherein the voltage values of the first direct-current voltage and the second direct-current voltage are not equal; the gamma voltage generation module receives a first direct current voltage to drive an output reference voltage or receives a second direct current voltage to drive and output a second group of gamma voltages to the source electrode driving circuit. The invention can reduce the power consumption of the liquid crystal display device when displaying the picture and correspondingly prolong the service life of the notebook computer battery.
Description
Technical Field
The present invention relates to the field of liquid crystal display technologies, and in particular, to a gamma voltage generating circuit, a method and a liquid crystal display device.
Background
Since the lcd device has advantages of lightness, thinness, energy saving, no radiation, etc., it is widely used in electronic devices such as tv, pc, tablet pc, PDA (Personal Digital Assistant), mobile phone, Digital camera, etc. The liquid crystal display device has different display modes such as a wide viewing angle display mode and a narrow viewing angle display mode.
However, no matter what display mode the existing liquid crystal display device is in, the power supply voltage used by the corresponding circuit generating the gamma voltage is always unchanged, so that the power consumption of the liquid crystal display device is always larger when the liquid crystal display device displays a picture, the service life of a notebook computer battery providing the power supply voltage is also reduced, and the user experience is reduced.
Disclosure of Invention
The invention provides a gamma voltage generating circuit, a gamma voltage generating method and a liquid crystal display device, which can be used for solving the problem that the power consumption of the liquid crystal display device is always larger when a picture is displayed.
The invention provides a gamma voltage generating circuit, which comprises a control module, a voltage conversion module and a gamma voltage generating module, wherein the control module outputs a first voltage conversion instruction according to a received first display mode control signal or outputs a second voltage conversion instruction according to a received second display mode control signal; the voltage conversion module receives a working voltage, converts the working voltage into a first direct-current voltage according to the first voltage conversion instruction, and sends the first direct-current voltage to a gamma correction circuit inside a source electrode driving circuit so as to drive the gamma correction circuit to output a plurality of internal gamma voltages, or converts the working voltage into a second direct-current voltage according to the second voltage conversion instruction, wherein the voltage value of the first direct-current voltage is not equal to the voltage value of the second direct-current voltage; the gamma voltage generation module receives the first direct current voltage to drive and output a plurality of reference voltages to the source driving circuit, so that the source driving circuit obtains a first set of gamma voltages according to the plurality of internal gamma voltages and/or the plurality of reference voltages, or the gamma voltage generation module receives the second direct current voltage to drive and output a second set of gamma voltages to the source driving circuit.
Preferably, the first display mode corresponding to the first display mode control signal is a wide viewing angle display mode, and the second display mode corresponding to the second display mode control signal is a narrow viewing angle display mode.
Preferably, the voltage conversion module is connected to the backlight power generation circuit, and is configured to control whether the backlight power generation circuit outputs the backlight current.
Preferably, the voltage conversion module is provided with a register, and the register stores the voltage value of the first dc voltage according to a first voltage conversion instruction and stores the voltage value of the second dc voltage according to a second voltage conversion instruction.
Preferably, the voltage conversion module is connected to the common electrode, and outputs a dc common voltage to the common electrode according to a first voltage conversion instruction, and outputs an ac common voltage to the common electrode according to a second voltage conversion instruction.
The present invention also provides a gamma voltage generating method, comprising: outputting a first voltage conversion instruction according to the received first display mode control signal, or outputting a second voltage conversion instruction according to the received second display mode control signal; receiving a working voltage, converting the working voltage into a first direct-current voltage according to the first voltage conversion instruction, and sending the first direct-current voltage to a gamma correction circuit inside a source electrode driving circuit to drive the gamma correction circuit to output a plurality of internal gamma voltages, or converting the working voltage into a second direct-current voltage according to the second voltage conversion instruction, wherein the voltage value of the first direct-current voltage is not equal to the voltage value of the second direct-current voltage; receiving the first direct current voltage to drive and output a plurality of reference voltages to the source driving circuit, so that the source driving circuit obtains a first group of gamma voltages according to the plurality of internal gamma voltages and/or the plurality of reference voltages; or receiving the second direct current voltage to drive and output a second group of gamma voltages to the source electrode driving circuit.
Preferably, the step of converting the operating voltage into a first direct current voltage according to the first voltage conversion instruction includes: outputting a backlight closing signal to enable the backlight power supply generation circuit to stop outputting backlight current; storing a voltage value of the first direct current voltage; outputting a direct current common voltage to a common electrode; and outputting a backlight starting signal to enable the backlight power generation circuit to output backlight current.
Preferably, the step of converting the operating voltage into a second direct current voltage according to the second voltage conversion instruction includes: outputting a backlight closing signal to enable the backlight power supply generation circuit to stop outputting backlight current; storing the voltage value of the second direct current voltage; outputting an alternating common voltage to the common electrode; and outputting a backlight starting signal to enable the backlight power generation circuit to output backlight current.
The invention also provides a liquid crystal display device which comprises the gamma voltage generating circuit.
Preferably, the liquid crystal display device further includes a connector, the connector is respectively connected to the control module and the voltage conversion module, and the connector is configured to provide the first display mode control signal, the second display mode control signal, and the working voltage.
The gamma voltage generating circuit, the method and the liquid crystal display device of the invention can generate a first direct current voltage and can be used for driving to generate a first group of gamma voltages in the first display mode, and generate a second direct current voltage and can be used for driving to generate a second group of gamma voltages in the second display mode, wherein the voltage value of the first direct current voltage is not equal to that of the second direct current voltage, the power consumption of the liquid crystal display device in the picture display process can be reduced, and the service life of a notebook battery is correspondingly prolonged.
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 voltage generating circuit according to a first embodiment of the present invention.
FIG. 2 shows a gamma voltage generating method according to a second embodiment of the present invention.
Fig. 3 is a method for switching receiving of a first voltage conversion command according to a second embodiment of the present invention.
Fig. 4 is a method for switching receiving of a second voltage conversion command according to a second embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to specific embodiments, structures, features and effects of the gamma voltage generating circuit, the method and the liquid crystal display device according to the present invention with reference to the accompanying drawings and the preferred embodiments.
The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings. While the present invention has been described in terms of embodiments and examples, which are intended to achieve the objects and advantages specified, the drawings are for reference and illustrative purposes only and are not intended to be limiting.
First embodiment
Fig. 1 is a circuit connection diagram of a gamma voltage generating circuit according to a first embodiment of the present invention. As shown in fig. 1, the gamma voltage generating circuit 100 of the present embodiment includes a control module 110, a voltage converting module 120, and a gamma voltage generating module 130. The control module 110 outputs a first voltage conversion instruction code1 according to the received first display mode control signal ck1 or outputs a second voltage conversion instruction code2 according to the received second display mode control signal ck 2. The voltage conversion module 120 receives the working voltage, converts the working voltage into a first direct current voltage AVDD1 according to a first voltage conversion command code1, and sends the first direct current voltage AVDD1 to a gamma correction circuit inside the source driving circuit 200 to drive the gamma correction circuit to output a plurality of internal gamma voltages, or converts the working voltage into a second direct current voltage AVDD2 according to a second voltage conversion command code2, wherein a voltage value of the first direct current voltage AVDD1 is not equal to a voltage value of the second direct current voltage AVDD 2. The gamma voltage generation module 130 receives the first direct current voltage AVDD1 to drive and output a plurality of reference voltages to the source driving circuit 200, such that the source driving circuit 200 obtains a first set of gamma voltages according to a plurality of internal gamma voltages and/or a plurality of reference voltages, or the gamma voltage generation module 130 receives the second direct current voltage AVDD2 to drive and output a second set of gamma voltages to the source driving circuit 200.
In one embodiment, the first display mode corresponding to the first display mode control signal ck1 may be a wide viewing angle display mode, and the second display mode corresponding to the second display mode control signal ck2 may be a narrow viewing angle display mode.
In one embodiment, the control module 110 may be an MCU chip.
In one embodiment, the first voltage conversion command code1 and the second voltage conversion command code2 may be, but are not limited to being, transmitted through an I2C bus. The I2C bus is a serial communication bus provided by PHILIPS, and has the advantages of few wiring, simple control mode, high communication speed and the like. The data line SDA and the clock line SCL are adopted to form a communication line, all devices can be connected to a bus in parallel to achieve data receiving and sending, the devices are independent of each other, and the devices are distinguished through unique bus addresses.
Specifically, the gamma voltage generating circuit 100 of the present embodiment can switch between two display modes, specifically, a first display mode and a second display mode, where the first display mode can be, for example, a wide viewing angle display mode, and the second display mode can be, for example, a narrow viewing angle display mode. When the display mode is switched to the first display mode, the control module 110 receives the first display mode control signal ck1 (which may be, but is not limited to, a low level signal), and the control module 110 outputs the first voltage conversion command code1 to the voltage conversion module 120 according to the first display mode control signal ck 1. The voltage conversion module 120 receives the operating voltage, converts the operating voltage into a first direct current voltage AVDD1 according to a first voltage conversion command code1, and sends the first direct current voltage AVDD1 to a gamma correction circuit inside the source driving circuit 200 to drive the gamma correction circuit to output a plurality of internal gamma voltages. Meanwhile, the voltage conversion module 120 also sends the first direct current voltage AVDD1 to the gamma voltage generation module 130, and the gamma voltage generation module 130 may receive the first direct current voltage AVDD1 to drive output of a plurality of reference voltages. Thus, the source driving circuit 200 may obtain the first set of gamma voltages according to the plurality of internal gamma voltages and/or the plurality of reference voltages, that is, the first gamma voltage of the first set of gamma voltages may be a set of a part or all of the plurality of internal gamma voltages and/or a part or all of the plurality of reference voltages, so as to accurately obtain the required first gamma voltage, for example, in an embodiment, the source driving circuit 200 may directly obtain the first set of gamma voltages according to the plurality of reference voltages, and in another embodiment, the source driving circuit 200 may directly obtain the first set of gamma voltages according to the part of the plurality of internal gamma voltages and the part of the plurality of reference voltages. In fig. 1, the reference voltages are denoted by V1 to V12, but the number of reference voltages is not limited in the present embodiment. Accordingly, the source driving circuit 200 can drive the output pixel signals according to the first set of gamma voltages for the liquid crystal display panel to display the image picture in the first display mode.
When the display mode is switched to the second display mode, the control module 110 receives the second display mode control signal ck2 (which may be, but is not limited to, a high level signal), and the control module 110 outputs the second voltage conversion command code2 to the voltage conversion module 120 according to the second display mode control signal ck 2. The voltage conversion module 120 receives the working voltage, converts the working voltage into a second direct current voltage AVDD2 according to a second voltage conversion command code2, and sends the second direct current voltage AVDD2 to the gamma voltage generation module 130, and the gamma voltage generation module 130 may receive the second direct current voltage AVDD2 to drive output of a second group of gamma voltages. Accordingly, the source driving circuit 200 can drive the output pixel signals according to the second group of gamma voltages for the liquid crystal display panel to display the image picture in the second display mode.
In this embodiment, the voltage value of the first dc voltage AVDD1 is not equal to the voltage value of the second dc voltage AVDD2, in an embodiment, the voltage value of the first dc voltage AVDD1 is smaller than the voltage value of the second dc voltage AVDD2, or in an embodiment, the voltage value of the first dc voltage AVDD1 is larger than the voltage value of the second dc voltage AVDD 2. In the prior art, the gamma voltage group in the corresponding display mode is obtained by driving the corresponding direct current voltage, and if the voltage value of the direct current voltage is set to be smaller, the larger gamma voltage in the gamma voltage group cannot be obtained by driving; if the voltage value of the direct current voltage is set to be larger, although the gamma voltage group can be obtained by driving, the waste of power consumption is larger; the problem of large power consumption waste may exist when different display modes are driven by the same direct current voltage to obtain corresponding different gamma voltage sets. Specifically, the present embodiment may be driven by the first dc voltage AVDD1 according to the maximum first gamma voltage of the first group of gamma voltages in the first display mode, and driven by the second dc voltage AVDD2 according to the maximum second gamma voltage of the second group of gamma voltages in the second display mode, where the voltage value of the first dc voltage AVDD1 may not be equal to the voltage value of the second dc voltage AVDD2, for example, the voltage value of the maximum first gamma voltage of the first group of gamma voltages in the first display mode (e.g., the wide viewing angle display mode) may be 6.76V, for example, the voltage value of the maximum second gamma voltage of the second group of gamma voltages in the second display mode (e.g., the narrow viewing angle display mode) may be 6.9V, for example, the voltage value of the first dc voltage dd1 may be set to 7V, the voltage value of the second dc voltage AVDD2 may be set to 7.2V, for example, the voltage setting is 7.2V compared with the voltage value of the first dc voltage AVDD1, the voltage value of the second direct current voltage AVDD2 is set to be 7.2V, so that the power consumption can be saved by about 15mW, the power consumption of the liquid crystal display device during displaying a picture is reduced, and the service life of the notebook computer battery is correspondingly prolonged.
In this embodiment, only the gamma voltage generation module 130 receives the second dc voltage AVDD2 to drive and output the second group of gamma voltages is taken as an example for explanation, but the embodiment does not limit the number of the gamma voltage groups driven and output by the gamma voltage generation module 130 receiving the second dc voltage AVDD2, for example, the number of the gamma voltage groups driven and output by the gamma voltage generation module 130 receiving the second dc voltage AVDD2 may be 2, specifically, the second group of gamma voltages and the third group of gamma voltages, and in an embodiment, the gamma voltage generation module 130 receives the second dc voltage AVDD2 to drive and alternately output the second group of gamma voltages and the third group of gamma voltages to the source driving circuit 200, which also belongs to the protection scope of the present invention.
In one embodiment, the voltage conversion module 120 is connected to the backlight power generating circuit, and is configured to control whether the backlight power generating circuit outputs the backlight current.
In one embodiment, the voltage conversion module 120 is provided with a register that stores a voltage value of the first direct current voltage AVDD1 according to the first voltage conversion command code1 and stores a voltage value of the second direct current voltage AVDD2 according to the second voltage conversion command code 2.
In one embodiment, the voltage conversion module 120 is connected to the common electrode and outputs a dc common voltage to the common electrode according to a first voltage conversion command code1 and outputs an ac common voltage to the common electrode according to a second voltage conversion command code 2.
When the voltage conversion module 120 of this embodiment switches to receive the first voltage conversion command code1, the voltage conversion module 120 outputs a backlight turning-off signal to the backlight power generation circuit first, so that the backlight power generation circuit stops outputting the backlight current, then the register inside the voltage conversion module stores the voltage value of the first dc voltage AVDD1 through, for example, a burning operation, the register inside the voltage conversion module stores the voltage value of the dc common voltage through, for example, a burning operation, so as to output the dc common voltage to the common electrode, and finally the backlight turning-on signal is output to the backlight power generation circuit, so that the backlight power generation circuit outputs the backlight current. When the voltage converting module 120 switches to receive the second voltage converting command code2, the voltage converting module 120 outputs a backlight turning-off signal to the backlight power generating circuit first to stop the backlight power generating circuit from outputting the backlight current, then stores the voltage value of the second dc voltage AVDD2 in the register through, for example, a burning operation, stores the voltage value of the ac common voltage in the register through, for example, a burning operation, so as to output the ac common voltage to the common electrode, and finally outputs a backlight turning-on signal to the backlight power generating circuit to cause the backlight power generating circuit to output the backlight current.
When the voltage conversion module 120 switches to receive the first voltage conversion command code1 or switches to receive the second voltage conversion command code2, the amplitude of the common voltage of the source driving circuit 200 is changed accordingly, so that the display contrast is changed in a corresponding time period, and the weakening of the backlight in the time period can compensate and prevent slight flicker possibly caused by instantaneous sudden change of the contrast, so that the display effect is kept uniform, and meanwhile, the average driving strength of the backlight is reduced, so that a part of the whole output power consumption can be saved.
The gamma voltage generating circuit of the embodiment generates the first direct current voltage AVDD1 and can be used for driving and generating the first group of gamma voltages in the first display mode, and generates the second direct current voltage AVDD2 and can be used for driving and generating the second group of gamma voltages in the second display mode, wherein the voltage value of the first direct current voltage AVDD1 is not equal to the voltage value of the second direct current voltage AVDD2, so that the power consumption of the liquid crystal display device in displaying a picture can be reduced, and the service life of the notebook battery can be correspondingly prolonged.
Second embodiment
FIG. 2 shows a gamma voltage generating method according to a second embodiment of the present invention. As shown in fig. 2, the present embodiment provides a gamma voltage switching method, including:
s1, outputting a first voltage conversion command code1 according to the received first display mode control signal ck1, or outputting a second voltage conversion command code2 according to the received second display mode control signal ck 2;
s2, receiving the working voltage, converting the working voltage into a first dc voltage AVDD1 according to the first voltage conversion command code1, and sending the first dc voltage AVDD1 to a gamma correction circuit inside the source driving circuit 200 to drive the gamma correction circuit to output a plurality of internal gamma voltages, or converting the working voltage into a second dc voltage AVDD2 according to the second voltage conversion command code2, wherein a voltage value of the first dc voltage AVDD1 is not equal to a voltage value of the second dc voltage AVDD 2;
s3, receiving the first dc voltage AVDD1 to drive and output a plurality of reference voltages to the source driving circuit 200, such that the source driving circuit 200 obtains a first set of gamma voltages according to the plurality of internal gamma voltages and/or the plurality of reference voltages; or receives the second dc voltage AVDD2 to drive and output the second set of gamma voltages to the source driving circuit 200.
For the specific implementation of this embodiment, reference may be made to the first embodiment, which is not described herein again.
Fig. 3 is a method of switching reception of the first voltage conversion instruction code1 according to the second embodiment of the present invention. As shown in fig. 3, in an embodiment, the step of converting the operating voltage into the first direct current voltage AVDD1 according to the first voltage conversion instruction code1 includes:
s211, outputting a backlight closing signal to enable the backlight power supply generating circuit to stop outputting backlight current;
s212, storing the voltage value of the first direct current voltage AVDD 1;
s213, storing the voltage value of the DC common voltage;
s214, outputting a backlight starting signal to enable the backlight power generating circuit to output backlight current.
Fig. 4 is a method of switching reception of the second voltage conversion instruction code2 according to the second embodiment of the present invention. As shown in fig. 4, in an embodiment, the step of converting the operating voltage into the second direct current voltage AVDD2 according to the second voltage conversion instruction code2 includes:
s221, outputting a backlight closing signal to enable the backlight power supply generating circuit to stop outputting backlight current;
s222, storing the voltage value of the second direct current voltage AVDD 2;
s223, storing the voltage value of the alternating current public voltage;
s224, outputting a backlight-on signal to enable the backlight power generating circuit to output a backlight current.
The gamma voltage generating method of the embodiment generates the first direct current voltage AVDD1 in the first display mode and can be used for driving to generate the first group of gamma voltages, and generates the second direct current voltage AVDD2 in the second display mode and can be used for driving to generate the second group of gamma voltages, wherein the voltage value of the first direct current voltage AVDD1 is not equal to the voltage value of the second direct current voltage AVDD2, so that the power consumption of the liquid crystal display device during displaying a picture can be reduced, and the service life of the notebook battery is correspondingly prolonged.
Third embodiment
The present embodiment provides a liquid crystal display device including the gamma voltage generating circuit 100 of the first embodiment.
In one embodiment, the liquid crystal display device further includes connectors respectively connected to the control module and the voltage conversion module 120, the connectors being used to provide the first display mode control signal ck1, the second display mode control signal ck2 and the operating voltage.
The liquid crystal display device of the embodiment generates the first direct current voltage AVDD1 and can be used for driving and generating the first group of gamma voltages in the first display mode, and generates the second direct current voltage AVDD2 and can be used for driving and generating the second group of gamma voltages in the second display mode, wherein the voltage value of the first direct current voltage AVDD1 is not equal to the voltage value of the second direct current voltage AVDD2, so that the power consumption of the liquid crystal display device in displaying a picture can be reduced, and the service life of the notebook battery is correspondingly prolonged.
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 voltage generation circuit, comprising
A control module (110), wherein the control module (110) outputs a first voltage conversion instruction according to the received first display mode control signal, or outputs a second voltage conversion instruction according to the received second display mode control signal;
the voltage conversion module (120), the voltage conversion module (120) receives a working voltage, converts the working voltage into a first direct current voltage according to the first voltage conversion instruction, and sends the first direct current voltage to a gamma correction circuit inside a source driving circuit (200) so as to drive the gamma correction circuit to output a plurality of internal gamma voltages, or converts the working voltage into a second direct current voltage according to the second voltage conversion instruction, wherein the voltage value of the first direct current voltage is not equal to the voltage value of the second direct current voltage;
a gamma voltage generation module (130), wherein the gamma voltage generation module (130) receives the first direct current voltage to drive to output a plurality of reference voltages to the source driving circuit (200), so that the source driving circuit (200) obtains a first set of gamma voltages according to the plurality of internal gamma voltages and/or the plurality of reference voltages, or the gamma voltage generation module (130) receives the second direct current voltage to drive to output a second set of gamma voltages to the source driving circuit (200).
2. The gamma voltage generating circuit of claim 1, wherein the first display mode corresponding to the first display mode control signal is a wide viewing angle display mode, and the second display mode corresponding to the second display mode control signal is a narrow viewing angle display mode.
3. The gamma voltage generating circuit of claim 1, wherein the voltage converting module (120) is connected to a backlight power generating circuit for controlling whether the backlight power generating circuit outputs a backlight current.
4. The gamma voltage generating circuit according to claim 1, wherein the voltage converting module (120) is provided with a register which stores a voltage value of the first direct current voltage according to a first voltage converting instruction and stores a voltage value of the second direct current voltage according to a second voltage converting instruction.
5. The gamma voltage generating circuit of claim 1, wherein the voltage converting module (120) is connected to a common electrode and outputs a dc common voltage to the common electrode according to a first voltage converting instruction and outputs an ac common voltage to the common electrode according to a second voltage converting instruction.
6. A method for generating gamma voltages, comprising
Outputting a first voltage conversion instruction according to the received first display mode control signal, or outputting a second voltage conversion instruction according to the received second display mode control signal;
receiving a working voltage, converting the working voltage into a first direct-current voltage according to the first voltage conversion instruction, and sending the first direct-current voltage to a gamma correction circuit inside a source electrode driving circuit (200) so as to drive the gamma correction circuit to output a plurality of internal gamma voltages, or converting the working voltage into a second direct-current voltage according to the second voltage conversion instruction, wherein the voltage value of the first direct-current voltage is not equal to the voltage value of the second direct-current voltage;
receiving the first direct current voltage to drive and output a plurality of reference voltages to the source driving circuit (200), so that the source driving circuit (200) obtains a first group of gamma voltages according to the plurality of internal gamma voltages and/or the plurality of reference voltages; or receive the second DC voltage to drive and output a second set of gamma voltages to the source driving circuit (200).
7. The gamma voltage generating method of claim 6, wherein the converting the operating voltage into the first direct current voltage according to the first voltage conversion command comprises:
outputting a backlight closing signal to enable the backlight power supply generation circuit to stop outputting backlight current;
storing a voltage value of the first direct current voltage;
storing the voltage value of the DC common voltage;
and outputting a backlight starting signal to enable the backlight power generation circuit to output backlight current.
8. The gamma voltage generating method of claim 6, wherein the converting the operating voltage into the second direct current voltage according to the second voltage conversion command comprises:
outputting a backlight closing signal to enable the backlight power supply generation circuit to stop outputting backlight current;
storing the voltage value of the second direct current voltage;
storing a voltage value of the alternating-current public voltage;
and outputting a backlight starting signal to enable the backlight power generation circuit to output backlight current.
9. A liquid crystal display device comprising the gamma voltage generating circuit according to any one of claims 1 to 5.
10. The lcd apparatus of claim 9, further comprising connectors respectively connected to the control module (110) and the voltage conversion module (120), the connectors for providing the first display mode control signal, the second display mode control signal, and the operating voltage.
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