CN110890048B - Gamma voltage generation circuit and display device - Google Patents
Gamma voltage generation circuit and display device Download PDFInfo
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- CN110890048B CN110890048B CN201911133079.4A CN201911133079A CN110890048B CN 110890048 B CN110890048 B CN 110890048B CN 201911133079 A CN201911133079 A CN 201911133079A CN 110890048 B CN110890048 B CN 110890048B
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- 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
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Abstract
The application discloses gamma voltage generation circuit and display device. The gamma voltage generating circuit includes: the power supply module is used for providing a reference voltage, and the reference voltage is constant in a working stage and is gradually reset to a reference ground potential in a shutdown stage; a voltage generation module generating a plurality of gamma voltages from a reference voltage; and the reset module is connected with at least one output end of the voltage generation module and provides a current path from the at least one output end to the reference ground potential, the current path is conducted at least in a shutdown stage so as to provide reset current for the at least one output end, and in the shutdown stage, the gamma voltage provided by the at least one output end is reset to the reference ground potential along with the reference voltage and has a reset rate higher than the reference voltage under the action of the reset current. The reset rate of the gamma voltage generating circuit is greater than that of the reference voltage, so that the current pumping phenomenon caused by the fact that the gamma voltage is greater than the reference voltage when the power supply is stopped is avoided, and the stability of the system is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a gamma voltage generation circuit and a display device.
Background
With the popularity of electronic circuits, chips are increasingly being used in a variety of integrated circuits or systems. In the gamma voltage generating circuit having the reference voltage and the gamma voltage, it is generally required that the absolute value of the gamma voltage is always smaller than that of the reference voltage, otherwise, a current pumping phenomenon (a load current reversely flows back to a voltage source) is easily occurred. For example, as shown in fig. 1, in the display device, when 14 sets of gamma voltages are used to drive the source driver chip (source IC), the source driver chip requires that the reference voltage AVDD is always greater than the gamma voltage VGMA1 and the reference voltage AVEE is always less than the gamma voltage VGMA14 when the source driver chip is turned off.
However, in the shutdown process of the gamma voltage generating circuit chip (Power IC) in the prior art, the timing sequence is not controlled, the timing sequences of the reference voltage AVDD, the gamma voltage VGMA1, the reference voltage AVEE, and the gamma voltage VGMA14 cannot meet the requirements of the source driver chip, the actually measured waveforms are shown in fig. 2a and 2b, when the gamma voltage generating circuit chip is shutdown, the reference voltage AVDD is reduced before the gamma voltage VGMA1, and the reference voltage AVEE is increased before the gamma voltage VGMA14, which may cause the shutdown abnormality of the source driver chip to cause the current drawing, and may even cause the source driver chip to be damaged.
Therefore, further improvement of the gamma voltage generating circuit chip of the prior art is needed to solve the above problems.
Disclosure of Invention
In view of the foregoing problems, it is an object of the present invention to provide a gamma voltage generating circuit and a display device, in which a reset rate of a gamma voltage is greater than a reset rate of a reference voltage, so as to avoid a current pumping phenomenon caused by the gamma voltage being greater than the reference voltage when power supply is stopped, thereby improving system stability.
According to an aspect of the present invention, there is provided a gamma voltage generating circuit including: the power supply module is used for providing a reference voltage at a power supply end, wherein the reference voltage is constant in a working stage and is gradually reset to a reference ground potential in a shutdown stage; a voltage generating module generating a plurality of gamma voltages according to a reference voltage, the gamma voltages being output to the display panel through different output terminals, respectively; and a reset module, connected to at least one of the output terminals, for providing a current path from the at least one of the output terminals to a ground reference, the current path being turned on at least in the shutdown phase to provide a reset current for the at least one of the output terminals, wherein in the shutdown phase, the gamma voltage provided by the at least one of the output terminals is reset to the ground reference along with the reference voltage, and has a reset rate higher than the reference voltage under the action of the reset current.
Preferably, the method further comprises the following steps: and the control module is used for controlling the on and off of the reset module according to a reset signal, wherein when the reset signal is at a high level, the reset module is turned off, and when the reset signal is at a low level, the reset module is turned on and provides the current path.
Preferably, the reference voltage and the gamma voltage are both positive voltages, and the control module includes: a first resistance circuit, a first end of which receives a high level voltage; the first switch tube is connected to the second end of the first resistor circuit, the second end of the second switch tube is connected to the reference ground, and the control end receives the reset signal.
Preferably, the reset module includes: a second resistance circuit having a first terminal connected to the output terminal and receiving the gamma voltage; and a second switch tube, wherein a first path end of the second switch tube is connected to a second end of the second resistance circuit, the second path end is connected to the reference ground, and a control end receives the control signal, wherein when the control signal is at a low level, the reset module is turned off, and when the control signal is at a high level, the reset module is turned on and provides the current path.
Preferably, the high level voltage is a thin film transistor turn-on voltage in the display panel.
Preferably, the reference voltage and the gamma voltage are both negative voltages, and the control module includes: a third resistance circuit, a first end of the third resistance circuit being connected to the reference voltage receiving end; a fourth resistive circuit, a first end of the fourth resistive circuit connected to a second end of the third resistive circuit; and a first switch tube, a first path end of which is connected to a second end of the fourth resistance circuit, a second path end of which receives the reset signal, and a control end of which is connected to the reference ground, wherein a second node between the third resistance circuit and the fourth resistance circuit provides the control signal, when the reset signal is at a high level, the first switch tube is conducted to the control module, the control signal is at a high level, when the reset signal is at a low level, the first switch tube is turned off to the control module, and the control signal is at a low level.
Preferably, the reset module includes: a fifth resistance circuit, a first terminal of which is connected to the output terminal and receives the gamma voltage; and a fourth switching tube, wherein a first path end of the fourth switching tube is connected to a second end of the fifth resistance circuit, a second path end of the fourth switching tube is connected to the reference ground, and a control end of the fourth switching tube receives the control signal.
Preferably, the output terminal of the voltage generation module includes a first terminal and a second terminal, the first terminal provides a first voltage, the first voltage is the largest one of the plurality of gamma voltages, the second terminal provides a second voltage, the second voltage is the smallest one of the plurality of gamma voltages, wherein the reset module is respectively connected to the first terminal and the second terminal, so that the reset rate of the first voltage is greater than the reset rate of the reference voltage, and the reset rate of the second voltage is greater than the reset rate of the reference voltage.
Preferably, the reset module includes a sixth resistor circuit and a seventh resistor circuit, a first end of the sixth resistor circuit is connected to the output end corresponding to the first voltage, a second end of the sixth resistor circuit is connected to the reference ground, a first end of the seventh resistor circuit is connected to the output end corresponding to the second voltage, and a second end of the seventh resistor circuit is connected to the reference ground.
According to a second aspect of the present invention, there is provided a display device comprising: the gamma voltage generating circuit as described above, for providing a plurality of kinds of gamma voltages; and
and the display panel is used for displaying pictures according to the gamma voltages. According to the gamma voltage generating circuit and the display device, the reset module is additionally arranged at the output end of the voltage generating module, when the gamma voltage generating circuit stops supplying power, the reset rate of the gamma voltage at the output end is greater than that of the reference voltage at the power supply end, so that the absolute value of the gamma voltage is always smaller than that of the reference voltage, the current pumping phenomenon caused by the fact that the gamma voltage is greater than the reference voltage is avoided, and the stability of a system is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 shows a waveform diagram of a gamma voltage generating circuit;
FIGS. 2a and 2b are diagrams illustrating shutdown waveforms of a gamma voltage generating circuit according to the related art, respectively;
FIG. 3 shows a schematic diagram of a gamma voltage generating circuit according to a first embodiment of the present invention;
FIGS. 4a and 4b are diagrams illustrating shutdown waveforms of a gamma voltage generating circuit according to a first embodiment of the present invention, respectively;
FIG. 5 shows a schematic diagram of a gamma voltage generating circuit according to a second embodiment of the present invention;
fig. 6a and 6b are diagrams illustrating shutdown waveforms of a gamma voltage generating circuit according to a second embodiment of the present invention, respectively;
fig. 7 shows a schematic diagram of a display device according to an embodiment of the invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, like elements are identified with the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as either a direct connection or an indirect connection via an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples.
FIG. 3 shows a schematic diagram of a gamma voltage generating circuit according to a first embodiment of the present invention;
fig. 4a and 4b respectively show shutdown waveform diagrams of the gamma voltage generating circuit according to the first embodiment of the present invention.
As shown in fig. 3, the gamma voltage generating circuit 110 includes a voltage generating module 112 and a reset module 113, and the gamma voltage generating circuit 110 is used for providing the gamma voltage required by the load according to the reference voltage AVDD and the reference voltage AVEE.
The voltage generating module 112 has a reference voltage receiving terminal, and at least one output terminal, and is configured to provide a gamma voltage required by a load according to the reference voltage AVDD and the reference voltage AVEE. In this embodiment, the reference voltage AVDD received by the reference voltage receiving terminal is a positive voltage and the reference voltage AVEE received by the reference voltage receiving terminal is a negative voltage, and in an alternative embodiment, the reference voltage AVEE may be a reference ground. Taking the voltage generation module 112 as a gamma voltage generation circuit as an example, the voltage generation module 112 generates a plurality of sets of gamma voltages to drive the source driver chip, and generates the plurality of sets of gamma voltages by dividing the gamma voltages by a plurality of resistor circuits connected in series between the reference voltage AVDD and the reference voltage AVEE.
The reset module 113 is connected to at least one output terminal of the voltage generation module 112 for providing a current path of the gamma voltage to the ground reference when the reference voltage and the reference voltage start to discharge. In this embodiment, when the gamma voltage generating circuit 110 stops supplying power, since the output terminal is connected with the reset module 113, the reset rate of the gamma voltage of the output terminal is greater than that of the reference voltage.
Preferably, the gamma voltages provided by the voltage generation module 112 include a plurality of sets of gamma voltages, wherein the maximum gamma voltage of the positive voltage values is a first voltage V1, the gamma voltage of the negative voltage value is a second voltage V14, and the reset module 113 includes a sixth resistor circuit and a seventh resistor circuit, the sixth resistor circuit includes at least a first resistor R1, and the seventh resistor circuit includes at least a second resistor R2. A first end of the sixth resistance circuit is connected to an output end corresponding to the first voltage V1, and a second end of the sixth resistance circuit is connected to the reference ground and used for providing a current path for the first voltage V1; the seventh resistor circuit has a first terminal connected to the output terminal corresponding to the second voltage V14, and a second terminal connected to the reference ground for providing a current path for the second voltage V14.
As shown in fig. 4a and 4b, when the gamma voltage generating circuit 110 stops supplying power, the sixth and seventh resistor circuits discharge the first and second voltages V1 and V14, so that the reset rate of the first voltage V1 is greater than that of the reference voltage AVDD, and the reset rate of the second voltage V14 is greater than that of the reference voltage AVEE, thereby avoiding the situation that the reference voltage AVDD is stepped down before the first voltage and the reference voltage AVEE is stepped up before the second voltage.
FIG. 5 shows a schematic diagram of a gamma voltage generating circuit according to a second embodiment of the present invention;
fig. 6a and 6b respectively show shutdown waveform diagrams of a gamma voltage generating circuit according to a second embodiment of the present invention.
As shown in fig. 5, the gamma voltage generating circuit 120 includes a voltage generating module 122, a reset module, and a control module, and the gamma voltage generating circuit 120 is configured to provide the gamma voltage required by the load according to the reference voltage AVDD and the reference voltage AVEE.
The voltage generating module 122 has a reference voltage receiving terminal, and at least one output terminal, and is configured to provide a gamma voltage required by the load according to the reference voltage AVDD and the reference voltage AVEE. In this embodiment, the reference voltage AVDD received by the reference voltage receiving terminal is a positive voltage and the reference voltage AVEE received by the reference voltage receiving terminal is a negative voltage, and in an alternative embodiment, the reference voltage AVEE may be a reference ground. Taking the voltage generation module 122 as an example of a gamma voltage generation circuit, the voltage generation module 122 generates a plurality of sets of gamma voltages to drive the source driver chip, and generates the plurality of sets of gamma voltages by dividing the gamma voltages by a plurality of resistor circuits connected in series between the reference voltage AVDD and the reference voltage AVEE.
The reset module includes at least one of the reset module 123a and the reset module 123b, and the reset module 123a and the reset module 123b are connected to the output terminal of the voltage generation module 112 for providing a current path of the gamma voltage to the ground reference when the reference voltage AVDD and the reference voltage AVEE start discharging.
In this embodiment, the reset module 123a is used to discharge the gamma voltages of the positive voltages, and the reset module 123b is used to discharge the gamma voltages of the negative voltages. For example, the gamma voltages provided by the voltage generation module 122 include a plurality of sets of gamma voltages, wherein the maximum gamma voltage of the positive voltage value is a first voltage V1, the gamma voltage of the negative voltage value is a second voltage V14, the reset module 123a is configured to provide a current path for the first voltage V1, and the reset module 123b is configured to provide a current path for the second voltage V14.
The control module includes at least one of a control module 124a and a control module 124b, and the control module 124a and the control module 124b are respectively configured to control the RESET module 123a and the RESET module 123b to turn on and off according to a RESET signal RESET to control the current path to turn on and off. Preferably, the RESET block is turned off when the RESET signal RESET is at a high level, and turned on and provides a current path when the RESET signal RESET is at a low level. In this embodiment, the RESET signal RESET can be provided by a voltage source related to the operation state of the gamma voltage generating circuit 120, for example, the RESET signal RESET is 3.3V when the gamma voltage generating circuit 120 starts to operate, and the RESET signal RESET is 0V when the gamma voltage generating circuit 120 stops operating.
When the gamma voltage includes a positive voltage, taking the gamma voltage as the first voltage V1 as an example, the reset module 123a is used to provide a current path from the first voltage V1 to the ground reference, and the control module 124a is used to control the on/off of the reset module 123 a. In this embodiment, the control module 124a includes: a first resistor circuit (at least comprising a third resistor R3), a first terminal of which receives a high level voltage VGH, the high level voltage VGH being, for example, a tft turn-on voltage, and the high level voltage VGH is kept at a high level for a predetermined time after the gamma voltage generating circuit 120 is powered off, in this embodiment, the high level voltage VGH is provided by the voltage generating module 122, and in an alternative embodiment, the high level voltage VGH may be provided by other gamma voltage generating circuits; the first switch tube Q1 has a first path end connected to the second end of the first resistor circuit, a second path end connected to the reference ground, and a control end receiving the RESET signal RESET, wherein a first node a between the first resistor circuit and the first switch tube Q1 provides a control signal, when the RESET signal RESET is at a high level, the first switch tube Q1 turns on the control module 124a, the control signal is at a low level, when the RESET signal RESET is at a low level, the first switch tube Q1 turns off the control module 124a, and the control signal is at a high level. The reset module 123a includes: a second resistance circuit (at least comprising a fourth resistor R4), a first end of the second resistance circuit being connected to the output end and receiving the first voltage V1; and a second switch tube Q2, a first path end of the second switch tube Q2 is connected to the second end of the second resistor circuit, the second path end is connected to the reference ground, and the control end receives the control signal, wherein when the control signal is at a low level, the reset module 123a is turned off, and when the control signal is at a high level, the reset module 123a is turned on and provides a current path. Therefore, when the RESET signal RESET is at a high level, the RESET module 123a is turned off, and when the RESET signal RESET is at a low level, the RESET module 123a is turned on to provide a current path from the first voltage V1 to the reference ground, and during the discharge of the gamma voltage generating circuit 120, the RESET rate of the first voltage V1 is greater than the RESET rate of the reference voltage AVDD.
When the gamma voltage includes a negative voltage, taking the gamma voltage as the second voltage V14 as an example, the reset module 123b is used to provide a current path from the second voltage V14 to the ground reference, and the control module 124b is used to control the on/off of the reset module 123 b. In this embodiment, the control module 124b includes: a third resistor circuit (at least comprising a fifth resistor R5), wherein the first end of the third resistor circuit is connected to the reference voltage receiving end; a fourth resistor circuit (at least comprising a sixth resistor R6), wherein the first end of the fourth resistor circuit is connected to the second end of the third resistor circuit; and a third switch tube Q3, a first path end of the third switch tube Q3 is connected to a second end of the fourth resistance circuit, the second path end receives a RESET signal RESET, and a control end is connected to the reference ground, wherein a second node B between the third resistance circuit and the fourth resistance circuit provides a control signal, when the RESET signal RESET is at a high level, the first switch tube Q1 turns on the control module 124B, the control signal is at a high level, when the RESET signal RESET is at a low level, the first switch tube Q1 turns off the control module 124B, and the control signal is at a low level. The reset module 123b includes: a fifth resistor circuit (including at least a seventh resistor R7), a first end of which is connected to the output terminal and receives the second voltage V14; a fourth switching tube Q4, a first path end of the fourth switching tube Q4 is connected to the second end of the fifth resistance circuit, a second path end is connected to the reference ground, and a control end receives the control signal, wherein when the control signal is at a high level, the reset module 123b is turned off, and when the control signal is at a low level, the reset module 123b is turned on and provides a current path. Therefore, when the RESET signal RESET is at a high level, the RESET block 123b is turned off, and when the RESET signal RESET is at a low level, the RESET block 123b is turned on to provide a current path of the second voltage V14 to the ground reference.
As shown in fig. 6a and 6b, when the gamma voltage generating circuit 120 stops supplying power, the reset module 123a and the reset module 123b discharge the first voltage V1 and the second voltage V14, so that the reset rate of the first voltage V1 is greater than that of the reference voltage AVDD, and the reset rate of the second voltage V14 is greater than that of the reference voltage AVEE, thereby avoiding the situation that the reference voltage AVDD is reduced before the first voltage and the reference voltage AVEE is increased before the second voltage.
Fig. 7 shows a schematic diagram of a display device according to an embodiment of the invention.
As shown in fig. 7, the display device 100 disclosed in the present embodiment includes: a gamma voltage generating circuit 110/120 for supplying a gamma voltage; and a display panel for displaying a picture according to at least the gamma voltage. The gamma voltage generating circuits 110/120 represent the gamma voltage generating circuit 110 shown in fig. 3 or the gamma voltage generating circuit 120 shown in fig. 5, and the circuit structures of the gamma voltage generating circuits 110/120 and the gamma voltage generating circuit 110 or the gamma voltage generating circuit 120 are the same, and are not described herein again.
In the present embodiment, when the display device 100 is operating normally, the gamma voltage generating circuits 110/120 provide the gamma voltages according to the reference voltages, for example, in a manner of dividing the voltages by resistors, the gamma voltages are provided according to the reference voltages of high level and the reference voltages of low level, so that the magnitude of the gamma voltages is smaller than that of the reference voltages. When the display device 100 is powered off, the gamma voltage generating circuit 110/120 stops supplying power, the reference voltage and the gamma voltage are both discharged and reduced to 0V within a period of time, the gamma voltage generating circuit 110/120 comprises a reset module and a voltage generating module, and the reset module is connected to an output end of the voltage generating module for supplying the gamma voltage, so that the reset rate of the gamma voltage is greater than that of the reference voltage, and thus, in the process of powering off the gamma voltage generating circuit 110, the gamma voltage is still less than the reference voltage all the time, the current pumping phenomenon caused by the fact that the gamma voltage is greater than the reference voltage when the power supply is stopped is avoided, and the stability of the system is improved.
Taking the lcd device as an example, the display panel includes a timing controller 130, a gate driving chip 140 and a source driving chip 150. The gamma voltage generating circuits 110/120 provide gamma voltages (e.g., gamma voltages) required for the operation of the array substrate 160, and the gamma voltages are selected by a gamma lookup table (e.g., integrated in the timing controller 130) and then transmitted to the source driver chip 150. The timing controller transmits source driving data and gate driving data to the source driving chip 150 and the gate driving chip 140, respectively, according to the image data. The gate driving chip 140 is connected to the array substrate 160 through a plurality of gate lines, the source driving chip 150 is connected to the array substrate 160 through a plurality of source lines, a plurality of thin film transistors connected to the gate lines and the source lines and having drain electrodes are disposed on the array substrate 160, the drain electrodes of the thin film transistors are connected to pixel electrodes, and the source driving chip 150 charges the pixel electrodes according to source driving data to change arrangement of liquid crystal molecules, thereby changing light transmittance of liquid crystal, and further, through the filtering effect of the filtering unit, the pixels are different in color. The gate driving chip 140 sequentially supplies gate signals to the plurality of gate lines according to the gate driving data, thereby sequentially gating the pixel electrode connected to the source line on each gate line, so that the source driving chip 150 sequentially charges the corresponding pixel electrode through the source line.
In this embodiment, the internal structure of the display device is described as an example of a liquid crystal display device, but the display device of the present invention is not limited to the liquid crystal display device, and the display device may be a plasma display device, an LED display device, an OLED display device, or another type of display device, and the internal structure of the display device is not limited thereto.
It should be understood that each functional unit in the present application may be integrated into one processing unit, each unit may exist separately, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or software.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A gamma voltage generation circuit, comprising:
the power supply module is used for providing a reference voltage at a power supply end, wherein the reference voltage is constant in a working stage and is gradually reset to a reference ground potential in a shutdown stage;
a voltage generating module generating a plurality of gamma voltages according to a reference voltage, the plurality of gamma voltages being output to the display panel through different output terminals, respectively;
a reset module connected to at least one of the output terminals to provide a current path from the at least one of the output terminals to a reference ground potential, the current path being turned on at least during the shutdown phase to provide a reset current to the at least one of the output terminals; and
a control module for controlling the on and off of the reset module according to a reset signal provided by a voltage source related to the working state of the gamma voltage generation circuit,
in the power-on stage, the reset signal is at a high level, the reset module is turned off, and in the power-off stage, the reset signal is at a low level, the reset module is turned on and provides the current path, so that the gamma voltage provided by the at least one output terminal is reset to the reference ground potential along with the reference voltage, and has a reset rate higher than the reference voltage under the action of the reset current.
2. The gamma voltage generation circuit of claim 1, wherein the reference voltage and the gamma voltage are both positive voltages,
the control module includes:
a first resistance circuit, a first end of which receives a high level voltage;
a first switch tube, a first path end of the first switch tube is connected to the second end of the first resistance circuit, a second path end is connected to the reference ground, a control end receives the reset signal,
wherein a first node between the first resistance circuit and the first switch tube provides a control signal,
when the reset signal is at high level, the first switch tube conducts the control module, the control signal is at low level,
when the reset signal is at a low level, the first switching tube turns off the control module, and the control signal is at a high level.
3. The gamma voltage generation circuit of claim 2, wherein the reset module comprises:
a second resistance circuit, a first end of which is connected to the output terminal and receives the gamma voltage;
a second switch tube, a first path end of the second switch tube is connected to a second end of the second resistance circuit, a second path end is connected to the reference ground, a control end receives the control signal,
wherein the reset module is turned off when the control signal is at a low level,
when the control signal is at a high level, the reset module is turned on and provides the current path.
4. The gamma voltage generating circuit of claim 2, wherein the high level voltage is a thin film transistor turn-on voltage in the display panel.
5. The gamma voltage generation circuit of claim 1, wherein the reference voltage and the gamma voltage are both negative voltages,
the control module includes:
a third resistance circuit, a first end of the third resistance circuit being connected to the reference voltage receiving end;
a fourth resistive circuit, a first end of the fourth resistive circuit connected to a second end of the third resistive circuit;
a third switch tube, a first path end of the third switch tube is connected to a second end of the fourth resistance circuit, a second path end receives the reset signal, a control end is connected to the reference ground,
wherein a second node between the third resistive circuit and the fourth resistive circuit provides a control signal,
when the reset signal is at high level, the third switching tube switches on the control module, the control signal is at high level,
when the reset signal is at a low level, the third switching tube turns off the control module, and the control signal is at a low level.
6. The gamma voltage generation circuit of claim 5, wherein the reset module comprises:
a fifth resistance circuit, a first end of the fifth resistance circuit being connected to the output terminal and receiving the gamma voltage;
a fourth switch tube, a first path end of the fourth switch tube is connected to the second end of the fifth resistance circuit, a second path end is connected to the reference ground, a control end receives the control signal,
wherein the reset module is turned off when the control signal is at a high level,
when the control signal is at a low level, the reset module is turned on and provides the current path.
7. The gamma voltage generation circuit of claim 1,
the output terminal of the voltage generation module includes a first terminal providing a first voltage, the first voltage being a largest one of the gamma voltages, and a second terminal providing a second voltage, the second voltage being a smallest one of the gamma voltages,
the reset modules are respectively connected to the first terminal and the second terminal, so that the reset rate of the first voltage is greater than that of the reference voltage, and the reset rate of the second voltage is greater than that of the reference voltage.
8. The gamma voltage generating circuit of claim 7, wherein the reset module comprises a sixth resistor circuit and a seventh resistor circuit,
a first terminal of the sixth resistance circuit is connected to the output terminal corresponding to the first voltage, a second terminal is connected to the reference ground,
the first end of the seventh resistor circuit is connected to the output end corresponding to the second voltage, and the second end of the seventh resistor circuit is connected to the reference ground.
9. A display device, comprising:
the gamma voltage generating circuit of any one of claims 1 to 8, for providing a plurality of gamma voltages; and
and the display panel is used for displaying pictures according to the gamma voltages.
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| CN109192163A (en) * | 2018-10-10 | 2019-01-11 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
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| CN1214309C (en) * | 2001-07-06 | 2005-08-10 | 神达电脑股份有限公司 | Rapid discharge circuit |
| KR102374748B1 (en) * | 2015-06-30 | 2022-03-17 | 엘지디스플레이 주식회사 | Power supply and display device using the same |
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| CN109410851B (en) * | 2017-08-17 | 2021-04-30 | 京东方科技集团股份有限公司 | Display driving circuit, voltage conversion device, display device and shutdown control method thereof |
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| CN109192163A (en) * | 2018-10-10 | 2019-01-11 | 惠科股份有限公司 | Display device and its method for eliminating shutdown ghosting image |
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