CN113889019A - Gamma reference voltage generation circuit, gamma voltage generation circuit and display device - Google Patents

Gamma reference voltage generation circuit, gamma voltage generation circuit and display device Download PDF

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Publication number
CN113889019A
CN113889019A CN202111208617.9A CN202111208617A CN113889019A CN 113889019 A CN113889019 A CN 113889019A CN 202111208617 A CN202111208617 A CN 202111208617A CN 113889019 A CN113889019 A CN 113889019A
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electrically connected
resistor
reference voltage
gamma reference
gamma
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李新吉
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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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
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The gamma reference voltage generating circuit, the gamma voltage generating circuit and the display device provided by the embodiment of the application comprise a voltage division module and a current limiting module, wherein the voltage value of the gamma reference voltage is limited by the voltage division module, so that the voltage difference between a first power supply signal and the gamma reference voltage is greater than 1 volt, and the voltage value of the first power supply signal is far greater than the voltage value of the gamma reference voltage. Although the increase of the load can cause the energy loss to be more serious, the voltage value of the first power supply signal is far larger than that of the gamma reference voltage, and the first power supply signal still has enough energy for converting the gamma reference voltage, so that the phenomenon of unstable gamma voltage can not occur, and the brightness uniformity of the display device is improved.

Description

Gamma reference voltage generation circuit, gamma voltage generation circuit and display device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a gamma reference voltage generation circuit, a gamma voltage generation circuit, and a display device.
Background
As the demands of customers on display effects are higher, the resolution and refresh rate of the existing display devices, especially the display devices of the electronic contest, are higher. However, as the resolution and refresh rate of the display increases, the load increases.
The gamma voltage is converted from the power voltage, and the power consumption is increased along with the increase of the load, so that the gamma voltage stability is influenced due to insufficient energy, and the brightness uniformity of the display device is further influenced.
Therefore, how to avoid the instability of the gamma voltage caused by the increase of the load is a difficult problem for the manufacturers of the existing panels to try to overcome.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a gamma reference voltage generating circuit, a gamma voltage generating circuit and a display device, which can solve the technical problem of unstable gamma voltages caused by an increase of loads.
An embodiment of the present application provides a gamma reference voltage generating circuit, including:
the input end is connected with a first power supply signal;
an output terminal electrically connected to the first node, the output terminal outputting a gamma reference voltage;
one end of the current limiting module is electrically connected to the input end, the other end of the current limiting module is electrically connected to the first node, and the current limiting module is used for limiting the current of the gamma reference voltage generating circuit;
and one end of the voltage division module is electrically connected to the first node, the other end of the voltage division module is electrically connected to a ground terminal, and the voltage division module is used for limiting the voltage value of the gamma reference voltage so that the voltage difference between the first power supply signal and the gamma reference voltage is greater than 1V.
In the gamma reference voltage generating circuit of the present application, a ratio of the resistance of the voltage dividing module to the resistance of the current limiting module is less than 12.
In the gamma reference voltage generating circuit of the present application, the voltage dividing module includes a first resistor, a second resistor, and a third resistor, one end of the first resistor is electrically connected to the first node, the other end of the first resistor is electrically connected to the second node, one end of the second resistor is electrically connected to the second node, the other end of the second resistor is electrically connected to the ground terminal, one end of the third resistor is electrically connected to the second node, and the other end of the third resistor is electrically connected to the ground terminal; the current limiting module comprises a fourth resistor, one end of the fourth resistor is electrically connected to the input end, and the other end of the fourth resistor is electrically connected to the first node.
In the gamma reference voltage generating circuit of the present application, the voltage dividing module includes a first resistor, a second resistor, and a third resistor, one end of the first resistor is electrically connected to the first node, the other end of the first resistor is electrically connected to the second node, one end of the second resistor is electrically connected to the second node, the other end of the second resistor is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to the ground terminal; the current limiting module comprises a fourth resistor, one end of the fourth resistor is electrically connected to the input end, and the other end of the fourth resistor is electrically connected to the first node.
In the gamma reference voltage generating circuit of the present application, the gamma reference voltage generating circuit further includes a zener diode, an anode terminal of the zener diode is electrically connected to the output terminal, a cathode terminal of the zener diode is electrically connected to the ground terminal, and a reference voltage terminal of the zener diode is electrically connected to the second node.
In the gamma reference voltage generating circuit, the gamma reference voltage generating circuit further includes a first filter capacitor and a second filter capacitor, one end of the first filter capacitor is electrically connected to the output end, the other end of the first filter capacitor is electrically connected to the ground end, one end of the second filter capacitor is electrically connected to the output end, and the other end of the second filter capacitor is electrically connected to the ground end.
In the gamma reference voltage generating circuit of the present application, the gamma reference voltage generating circuit further includes a third filter capacitor, one end of the first filter capacitor is electrically connected to the input end, and the other end of the first filter capacitor is electrically connected to the ground end.
The embodiment of the present application further provides a gamma voltage generating circuit, which includes a driving chip and the gamma reference voltage generating circuit as described above,
the gamma reference voltage generating circuit is electrically connected to the driving chip and is used for generating gamma reference voltage and sending the gamma reference voltage to the driving chip;
the driving chip is used for generating n-order gamma voltage according to the gamma reference voltage.
In the gamma voltage generating circuit of the present application, the gamma voltage generating circuit further includes a load resistor, one end of the load resistor is electrically connected to the output end of the gamma reference voltage generating circuit, and the other end of the load resistor is electrically connected to the input end of the driving chip.
The embodiment of the present application further provides a display device, the display device includes a display panel and the gamma voltage generating circuit as described above, an output end of the gamma voltage generating circuit is electrically connected to an input end of the display panel, and the gamma voltage generating circuit is configured to send a gamma voltage to the display panel.
In the gamma reference voltage generation circuit, the gamma voltage generation circuit and the display device provided by the embodiment of the application, the gamma reference voltage generation circuit comprises a voltage division module and a current limiting module, and the voltage value of the gamma reference voltage is limited by the voltage division module, so that the voltage difference between a first power supply signal and the gamma reference voltage is greater than 1 volt, and the voltage value of the first power supply signal is far greater than the voltage value of the gamma reference voltage. Although the increase of the load can cause the energy loss to be more serious, the voltage value of the first power supply signal is far larger than that of the gamma reference voltage, and the first power supply signal still has enough energy for converting the gamma reference voltage, so that the phenomenon of unstable gamma voltage can not occur, and the brightness uniformity of the display device is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure.
Fig. 2 is a first circuit diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure.
Fig. 3 is a second circuit diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure.
Fig. 4 is a third circuit schematic diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure.
Fig. 5 is a fourth circuit schematic diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure.
Fig. 6 is a fifth circuit schematic diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure.
Fig. 7 is a schematic diagram of a first structure of a gamma voltage generation circuit according to an embodiment of the present disclosure.
Fig. 8 is a schematic diagram of a second structure of a gamma voltage generation circuit according to an embodiment of the present disclosure.
Fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 1, a gamma reference voltage generating circuit 10a according to an embodiment of the present disclosure includes an input terminal 101, an output terminal 102, a ground terminal 103, a current limiting module 104, and a voltage dividing module 105.
The input terminal 101 is connected to a first power supply signal VAA. The output terminal 102 is electrically connected to the first node P. The ground terminal 103 is connected to the second power signal VSS. One end of the current limiting module 104 is electrically connected to the input end 101, and the other end of the current limiting module 104 is electrically connected to the first node P. One end of the voltage dividing module 105 is electrically connected to the first node P, and the other end of the voltage dividing module 105 is electrically connected to the ground terminal 103.
The current limiting module 104 is used for limiting the current of the gamma reference voltage generating circuit 10 a. The voltage division module is used for limiting the voltage value of the gamma reference voltage Vref, so that the voltage difference between the first power signal VAA and the gamma reference voltage Vref is greater than or equal to 1 volt. Specifically, the voltage difference between the first power signal VAA and the gamma reference voltage Vref is 1.1 volt, 1.5 volts, 2 volts, 2.5 volts, 3.2 volts, or 4 volts. The specific voltage difference between the first power signal VAA and the gamma reference voltage Vref is determined by the specific requirements of the gamma reference voltage generation circuit 10 a.
It should be noted that, in the prior art, the energy of the gamma reference voltage is supplied by the first power signal, so that when the load increases, the energy loss is too much, and according to the law of conservation of energy, the energy supplied by the first power signal to the gamma reference voltage is not enough to support the gamma reference voltage to maintain stable, so that the gamma voltage is unstable, and the display device has uneven brightness.
In the embodiment of the present application, the voltage difference between the first power signal VAA and the gamma reference voltage Vref is greater than 1 v, so the voltage value of the first power signal VAA is much greater than the voltage value of the gamma reference voltage Vref. Although the energy loss is increased due to the increase of the load, since the voltage value of the first power signal VAA is much larger than the voltage value of the gamma reference voltage Vref, the first power signal VAA still has enough energy to be supplied to the gamma reference voltage Vref to maintain the stability of the gamma reference voltage Vref, so that the phenomenon of unstable gamma voltage is avoided, and the phenomenon of uneven brightness of the display device is avoided.
In addition, at the time of the circuit start signal switching, the data signal is shifted from a low load to a high load, thereby causing the first power supply signal VAA to be pulled low. However, since the voltage value of the first power signal VAA is much greater than the voltage value of the gamma reference voltage Vref, the first power signal VAA still has enough energy to be supplied to the gamma reference voltage Vref to maintain the gamma reference voltage Vref stable, so that the phenomenon of unstable gamma voltage is avoided, and the phenomenon of uneven brightness of the display device is avoided.
Wherein, the ratio of the resistance of the voltage dividing module 105 to the resistance of the current limiting module 104 is less than 12. Specifically, the ratio of the resistance of the voltage divider module 105 to the resistance of the current limiter module 104 is 11, 10, 8.5, or 7. The specific ratio of the resistance of the voltage divider module 105 to the resistance of the current limiter module 104 is determined by the specific requirements of the gamma reference voltage generating circuit 10 a.
It should be noted that, since the output terminal 102 is electrically connected to the first node P, the voltage value of the gamma reference voltage Vref output by the output terminal 102 is equal to the voltage value of the first node P. Therefore, the calculation formula of the gamma reference voltage Vref can be derived as follows:
Figure BDA0003307938190000052
wherein R is1Is the resistance value, R, of the current limiting module 1042The voltage divider 105 is a resistance value, Vref is a voltage value of the gamma reference voltage Vref, and VAA is a voltage value of the first power signal VAA.
Therefore, the calculation formula of the voltage difference between the first power signal VAA and the gamma reference voltage Vref can be derived from the above equation as follows:
Figure BDA0003307938190000051
wherein R is1Is the resistance value, R, of the current limiting module 1042The voltage divider 105 is a resistance value, Vref is a voltage value of the gamma reference voltage Vref, and VAA is a voltage value of the first power signal VAA.
The voltage value of the first power supply signal VAA is a fixed value. The voltage value of the first power signal VAA is between 13 volts and 16 volts, and the voltage value of the first power signal VAA is typically 13 volts. Therefore, when the ratio of the resistance of the voltage divider 105 to the resistance of the current limiter 104 is smaller than 12 by limiting the resistance of the voltage divider 105 to the resistance of the current limiter 104, the voltage difference between the first power signal VAA and the gamma reference voltage Vref can be larger than 1 v, so as to maintain the stability of the gamma reference voltage Vref, avoid the instability of the gamma voltage, and further avoid the non-uniform brightness of the display device.
It should be noted that the first power signal VAA and the second power signal VSS are both used for outputting a predetermined voltage value. In addition, in the embodiment of the present application, the potential of the first power signal VAA is greater than the potential of the second power signal VSS. Specifically, the potential of the second power signal VSS is the potential of the ground terminal. Of course, it is understood that the potential of the second power signal VSS may be other.
Referring to fig. 2, fig. 2 is a first circuit diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 1 and 2, the voltage divider 105 includes a first resistor 105a, a second resistor 105b, and a third resistor 105 c. One end of the first resistor 105a is electrically connected to the first node P. The other end of the first resistor 102a is electrically connected to the second node Q. One end of the second resistor 105b is electrically connected to the second node Q, the other end of the second resistor 105b is electrically connected to one end of the third resistor 105c, and the other end of the third resistor 105c is electrically connected to the ground terminal 103. The current limiting module 101 includes a fourth resistor 104 a. One end of the fourth resistor 104a is electrically connected to the input terminal 101, and the other end of the fourth resistor 104a is electrically connected to the first node P.
It should be noted that the voltage dividing module 105 includes a plurality of resistors arranged in series, so as to contribute to dividing the first power limit VAA to form the gamma reference voltage Vref. Additionally, the current limiting module 104 may also include a plurality of resistors arranged in series.
The voltage dividing module 105 includes a first resistor 105a, a second resistor 105b, and a third resistor 105c, and the first resistor 105a, the second resistor 105b, and the third resistor 105c are connected in series, so that the resistance of the voltage dividing module 105 is equal to the sum of the resistance of the first resistor 105a, the resistance of the second resistor 105b, and the resistance of the third resistor 105 c. The current limiting module 104 includes a fourth resistor 104a, and thus, the resistance of the current limiting module 104 is equal to the resistance of the fourth resistor 104 a.
It should be noted that, when the ratio of the sum of the resistance of the first resistor 105a, the resistance of the second resistor 105b, and the resistance of the third resistor 105c to the resistance of the fourth resistor 104a is smaller than 12, the ratio of the voltage dividing module 105 to the current limiting module 104 is smaller than 12, so that the voltage difference between the first power signal VAA and the gamma reference voltage Vref is larger than 1 v, and thus the gamma reference voltage Vref can be maintained stable, the phenomenon of unstable gamma voltage is avoided, and the phenomenon of uneven brightness of the display device is avoided.
Referring to fig. 3, fig. 3 is a second circuit diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 1 and 3, the voltage divider 105 includes a first resistor 105a, a second resistor 105b, and a third resistor 105 c. One end of the first resistor 105a is electrically connected to the first node P. The other end of the first resistor 102a is electrically connected to the second node Q. The second resistor 105b and the third resistor 105c are arranged in parallel. One end of the second resistor 105b is electrically connected to the second node Q, the other end of the second resistor 105b is electrically connected to the ground terminal 103, one end of the third resistor 105c is electrically connected to the second node Q, and the other end of the third resistor 105c is electrically connected to the ground terminal 103. The current limiting module 101 includes a fourth resistor 101 a. One end of the fourth resistor 101a is electrically connected to the input terminal 101, and the other end of the fourth resistor 101a is electrically connected to the first node P
It should be noted that, the second resistor 105b and the third resistor 105c are arranged in parallel, so that the stability of the Q voltage at the second node can be improved, and the stability of the gamma reference voltage Vref can be improved.
Referring to fig. 4, fig. 4 is a third circuit schematic diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 4, the gamma reference voltage generating circuit 10a shown in fig. 4 is different from the gamma voltage generating circuit 10a shown in fig. 3 in that: the gamma reference voltage generating circuit 10a further includes a zener diode 106. The anode terminal of the zener diode 106 is electrically connected to the output terminal 102. The cathode terminal of the zener diode 106 is electrically connected to the ground terminal 103. The reference voltage terminal of the zener diode 106 is electrically connected to the second node Q.
In the prior art, since the trace also consumes a certain amount of energy, the voltage of the second node cannot reach the expected value, which affects the stability of the gamma reference voltage. The zener diode can utilize the reverse breakdown state of the PN junction so that its current can vary over a wide range with substantially constant voltage.
It should be noted that, in the embodiment of the present application, the zener diode 106 is arranged to generate the feedback voltage Vfb, so that the voltage value of the second node Q is maintained as the voltage value of the feedback voltage Vfb, thereby contributing to improving the stability of the gamma reference voltage Vref, further improving the stability of the gamma voltage, and contributing to improving the brightness uniformity of the display device. The feedback voltage Vfb may be calculated by the following calculation formula:
Figure BDA0003307938190000081
wherein R is3Is the resistance of the first resistor 105a, R4Is the resistance of the second resistor 105b, R5The third resistor 105c is a resistor, Vfb is a feedback voltage, and Vref is a gamma reference voltage.
In the embodiment of the present application, the voltage value of the second node Q can be maintained as the voltage value of the feedback voltage Vfb by setting the zener diode 106, so as to contribute to improving the stability of the gamma reference voltage Vref, further improve the stability of the gamma voltage, and contribute to improving the brightness uniformity of the display device.
Referring to fig. 5, fig. 5 is a fourth circuit diagram of a gamma reference voltage generating circuit according to an embodiment of the disclosure. As shown in fig. 5, the gamma reference voltage generating circuit 10a shown in fig. 5 is different from the gamma reference voltage generating circuit 10a shown in fig. 4 in that: the gamma reference voltage generating circuit 10a further includes a first filter capacitor 107 and a second filter capacitor 108. One end of the first filter capacitor 107 is electrically connected to the output terminal 102, and the other end of the first filter capacitor 107 is electrically connected to the ground terminal 103. One end of the second filter capacitor 108 is electrically connected to the output terminal 102, and the other end of the second filter capacitor 108 is electrically connected to the ground terminal 103.
It should be noted that the filter capacitor not only can make the dc output of the power supply smooth and stable, reduce the influence of the alternating pulsating current on the electronic circuit, but also can absorb the current fluctuation generated in the working process of the electronic circuit and the interference from the series connection of the ac power supply, so that the working performance of the electronic circuit is more stable.
In the embodiment of the present application, the first filter capacitor 107 and the second filter capacitor 108 are arranged to perform a filtering function, so as to improve the stability of a loop formed by the output terminal 102 of the gamma reference voltage generating circuit 10a and the ground terminal 103 of the gamma reference voltage generating circuit 10a, thereby facilitating to improve the stability of the gamma voltage Vref.
It should be noted that the first filter capacitor 107 and the second filter capacitor 108 are arranged in parallel. The first filter capacitor 107 and the second filter capacitor 108 which are arranged in parallel are arranged, so that the filtering effect can be improved.
Referring to fig. 6, fig. 6 is a fifth circuit diagram of a gamma reference voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 6, the gamma reference voltage generating circuit 10a shown in fig. 6 is different from the gamma reference voltage generating circuit 10a shown in fig. 5 in that: the gamma reference voltage generating circuit 10a further includes a third filter capacitor 109, one end of the third filter capacitor 109 is electrically connected to the input terminal 101, and the other end of the third filter capacitor 109 is electrically connected to the first node P.
It should be noted that the filter capacitor not only can make the dc output of the power supply smooth and stable, reduce the influence of the alternating pulsating current on the electronic circuit, but also can absorb the current fluctuation generated in the working process of the electronic circuit and the interference from the series connection of the ac power supply, so that the working performance of the electronic circuit is more stable.
In the embodiment of the present application, the third filtering capacitor 109 is arranged to perform a filtering function, so as to improve the stability of a loop formed by the input terminal 101 of the gamma reference voltage generating circuit 10a and the ground terminal 103 of the gamma reference voltage generating circuit 10a, thereby facilitating to improve the stability of the first power signal VAA, and further facilitating to improve the stability of the gamma reference voltage Vref.
A plurality of filter capacitors arranged in parallel may be further disposed at the position where the third filter capacitor 109 is disposed, so as to improve the filtering effect.
The gamma reference voltage generation circuit provided by the embodiment of the application comprises a voltage division module and a current limiting module, wherein the voltage value of the gamma reference voltage is limited by the voltage division module, so that the voltage difference between a first power supply signal and the gamma reference voltage is greater than 1 volt, and the voltage value of the first power supply signal is far greater than the voltage value of the gamma reference voltage. Although the increase of the load can cause the energy loss to be more serious, the voltage value of the first power supply signal is far larger than that of the gamma reference voltage, and the first power supply signal still has enough energy for converting the gamma reference voltage, so that the phenomenon of unstable gamma voltage can not occur, and the brightness uniformity of the display device is improved.
The embodiment of the application also provides a gamma voltage generating circuit. Referring to fig. 7, fig. 7 is a first structural schematic diagram of a gamma voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 7, the gamma voltage generating circuit 10 provided in the embodiment of the present application includes a driving chip 10b and a gamma reference voltage generating circuit 10a as described in the above embodiments. The gamma reference voltage generating circuit 10a is electrically connected to the driving chip 10 b. The gamma reference voltage generation circuit 10a is used for generating a gamma reference voltage Vref, and sending the gamma reference voltage Vref to the driving chip 10 b. The driving chip is used for generating n-order gamma voltages according to the gamma reference voltage Vref. The gamma reference voltage generating circuit 10a can refer to the description of the gamma voltage generating circuit 10a, and is not described herein again.
It should be noted that, since the gamma reference voltage Vref output by the gamma reference voltage generation circuit 10a can be maintained stable, it is not necessary to set a filter capacitor at the driving chip 10b to maintain the stability of the n-order gamma voltage, so that the cost of the gamma voltage generation circuit can be reduced.
Referring to fig. 8, fig. 8 is a schematic diagram of a second structure of a gamma voltage generating circuit according to an embodiment of the present disclosure. As shown in fig. 8, the gamma voltage generating circuit shown in fig. 8 is different from the gamma voltage generating circuit shown in fig. 7 in that: the gamma voltage generating circuit 10 further includes a load resistor 10 c. One end of the load resistor 10c is electrically connected to the output end of the gamma reference voltage generating circuit 10a, and the other end of the load resistor 10c is electrically connected to the input end of the driving chip 10 b.
It should be noted that the load resistor 10c is configured to send the gamma reference voltage Vref generated by the gamma reference voltage generation circuit 10a to the driver chip 10b in the form of a current.
The gamma voltage generation circuit provided by the embodiment of the application comprises a voltage division module and a current limiting module, wherein the voltage value of the gamma reference voltage is limited by the voltage division module, so that the voltage difference between a first power supply signal and the gamma reference voltage is greater than 1 volt, and the voltage value of the first power supply signal is far greater than the voltage value of the gamma reference voltage. Although the increase of the load can cause the energy loss to be more serious, the voltage value of the first power supply signal is far larger than that of the gamma reference voltage, and the first power supply signal still has enough energy for converting the gamma reference voltage, so that the phenomenon of unstable gamma voltage can not occur, and the brightness uniformity of the display device is improved.
The embodiment of the application also provides a display device. Referring to fig. 9, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 9, the display device 1 provided in the embodiment of the present application includes a display panel 20 and a gamma voltage generating circuit 10 as described in the above embodiments. The output terminal of the gamma voltage generating circuit 10 is electrically connected to the input terminal of the display panel 20. The gamma voltage generating circuit 10 is used for sending gamma voltages to the display panel 20. The gamma voltage generating circuit 10 can refer to the description of the gamma voltage generating circuit 10, and is not described herein again.
In the display device provided by the embodiment of the application, the voltage dividing module and the current limiting module are included, and the voltage value of the gamma reference voltage is limited by the voltage dividing module, so that the voltage difference between the first power signal and the gamma reference voltage is greater than 1 volt, and the voltage value of the first power signal is far greater than the voltage value of the gamma reference voltage. Although the increase of the load can cause the energy loss to be more serious, the voltage value of the first power supply signal is far larger than that of the gamma reference voltage, and the first power supply signal still has enough energy for converting the gamma reference voltage, so that the phenomenon of unstable gamma voltage can not occur, and the brightness uniformity of the display device is improved.
The gamma reference voltage generating circuit, the gamma voltage generating circuit and the display device provided by the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and implementations of the present application, and the description of the embodiments above is only used to help understand the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A gamma reference voltage generation circuit, comprising:
the input end is connected with a first power supply signal;
an output terminal electrically connected to the first node, the output terminal outputting a gamma reference voltage;
one end of the current limiting module is electrically connected to the input end, the other end of the current limiting module is electrically connected to the first node, and the current limiting module is used for limiting the current of the gamma reference voltage generating circuit;
and one end of the voltage division module is electrically connected to the first node, the other end of the voltage division module is electrically connected to a ground terminal, and the voltage division module is used for limiting the voltage value of the gamma reference voltage so that the voltage difference between the first power supply signal and the gamma reference voltage is greater than 1V.
2. The gamma reference voltage generating circuit of claim 1, wherein the ratio of the resistance of the voltage dividing module to the resistance of the current limiting module is less than 12.
3. The gamma reference voltage generating circuit according to claim 2, wherein the voltage divider module comprises a first resistor, a second resistor and a third resistor, one end of the first resistor is electrically connected to the first node, the other end of the first resistor is electrically connected to a second node, one end of the second resistor is electrically connected to the second node, the other end of the second resistor is electrically connected to the ground terminal, one end of the third resistor is electrically connected to the second node, and the other end of the third resistor is electrically connected to the ground terminal; the current limiting module comprises a fourth resistor, one end of the fourth resistor is electrically connected to the input end, and the other end of the fourth resistor is electrically connected to the first node.
4. The gamma reference voltage generating circuit according to claim 2, wherein the voltage divider module comprises a first resistor, a second resistor and a third resistor, one end of the first resistor is electrically connected to the first node, the other end of the first resistor is electrically connected to a second node, one end of the second resistor is electrically connected to the second node, the other end of the second resistor is electrically connected to one end of the third resistor, and the other end of the third resistor is electrically connected to the ground terminal; the current limiting module comprises a fourth resistor, one end of the fourth resistor is electrically connected to the input end, and the other end of the fourth resistor is electrically connected to the first node.
5. The gamma reference voltage generating circuit according to claim 4, further comprising a zener diode, wherein an anode terminal of the zener diode is electrically connected to the output terminal, a cathode terminal of the zener diode is electrically connected to the ground terminal, and a reference voltage terminal of the zener diode is electrically connected to the second node.
6. The gamma reference voltage generating circuit according to claim 2, further comprising a first filter capacitor and a second filter capacitor, wherein one end of the first filter capacitor is electrically connected to the output terminal, the other end of the first filter capacitor is electrically connected to the ground terminal, one end of the second filter capacitor is electrically connected to the output terminal, and the other end of the second filter capacitor is electrically connected to the ground terminal.
7. The gamma reference voltage generating circuit according to claim 6, further comprising a third filter capacitor, wherein one end of the first filter capacitor is electrically connected to the input terminal, and the other end of the first filter capacitor is electrically connected to the ground terminal.
8. A gamma voltage generation circuit comprising a driver chip and the gamma reference voltage generation circuit of claims 1 to 7, wherein,
the gamma reference voltage generating circuit is electrically connected to the driving chip and is used for generating gamma reference voltage and sending the gamma reference voltage to the driving chip;
the driving chip is used for generating n-order gamma voltage according to the gamma reference voltage.
9. The gamma voltage generating circuit according to claim 8, further comprising a load resistor, wherein one end of the load resistor is electrically connected to the output terminal of the gamma reference voltage generating circuit, and the other end of the load resistor is electrically connected to the input terminal of the driver chip.
10. A display device, comprising a display panel and the gamma voltage generating circuit of claims 8-9, wherein the output terminal of the gamma voltage generating circuit is electrically connected to the input terminal of the display panel, and the gamma voltage generating circuit is configured to send a gamma voltage to the display panel.
CN202111208617.9A 2021-10-18 2021-10-18 Gamma reference voltage generation circuit, gamma voltage generation circuit and display device Pending CN113889019A (en)

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CN211087035U (en) * 2019-11-15 2020-07-24 深圳市视显光电技术有限公司 Voltage stabilizing circuit and voltage stabilizing device for reducing reference voltage ripple
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Publication number Priority date Publication date Assignee Title
CN101364388A (en) * 2007-08-07 2009-02-11 奇美电子股份有限公司 Novel integrated DC transducer applied to LCD
CN201080839Y (en) * 2007-09-18 2008-07-02 重庆川仪总厂有限公司 Stepping motor driven oil manometer
CN104143901A (en) * 2013-05-06 2014-11-12 立锜科技股份有限公司 Control circuit of power converter and relevant control method
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