CN113870760A - Gamma adjustment circuit and driving method - Google Patents
Gamma adjustment circuit and driving method Download PDFInfo
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- CN113870760A CN113870760A CN202111135798.7A CN202111135798A CN113870760A CN 113870760 A CN113870760 A CN 113870760A CN 202111135798 A CN202111135798 A CN 202111135798A CN 113870760 A CN113870760 A CN 113870760A
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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
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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
- G09G3/2007—Display of intermediate tones
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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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
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Abstract
The application discloses a gamma regulating circuit and a driving method, wherein the gamma regulating circuit comprises an input voltage end, a gamma reference voltage end, a gamma voltage generating circuit and a voltage comparison circuit, wherein the input voltage end outputs an input voltage; the gamma reference voltage end outputs gamma reference voltage; the input end of the gamma voltage generating circuit is connected with a gamma reference voltage end, and the gamma voltage generating circuit generates a plurality of gamma voltages according to the gamma reference voltage; the first input end of the voltage comparison circuit is connected to the gamma reference voltage end, the second input end of the voltage comparison circuit is connected to the input voltage end, the output end of the voltage comparison circuit is connected to the gamma voltage generation circuit, the voltage comparison circuit controls the gamma voltage generation circuit and the gamma reference voltage end to be communicated or cut off according to the comparison result of the input voltage and the gamma reference voltage, the gamma reference voltage end is effectively isolated from the gamma voltage generation circuit, and the situation that the gamma reference voltage and the gamma voltage are influenced mutually before reaching a preset value to cause poor display effect is avoided.
Description
Technical Field
The present application relates to the field of circuit control, and in particular, to a gamma adjusting circuit and a driving method.
Background
In the existing display, resolution is increased more and more, 2K and 4K screens are also popularized, in a 4K UHD (Ultra HD) product, because the set value of the AVDD voltage is higher, the time required for the AVDD voltage to climb to a preset value during starting is longer, the GAMMA voltage is easily established before the AVDD voltage during starting, and the GAMMA voltage reaches the preset value before the AVDD voltage, so that the output of the GAMMA voltage is unstable, abnormality is caused to a Driver IC and a Pgamma IC, and the risk of screen flashing during starting is caused, thereby causing poor display effect of the display.
Disclosure of Invention
The gamma regulating circuit is provided with a voltage comparison circuit, the voltage comparison circuit controls the gamma voltage generating circuit to be communicated with a gamma reference voltage end according to the magnitude relation between the input voltage output by the input voltage end and the gamma reference voltage output by the gamma reference voltage end, the gamma reference voltage end is effectively isolated from the gamma voltage generating circuit, and the gamma reference voltage end and the gamma voltage are prevented from influencing each other.
The application discloses a gamma regulating circuit, which comprises an input voltage end, a gamma reference voltage end, a gamma voltage generating circuit and a voltage comparison circuit, wherein the input voltage end outputs an input voltage; the gamma reference voltage terminal outputs a gamma reference voltage; the input end of the gamma voltage generating circuit is connected to the gamma reference voltage end, and the gamma voltage generating circuit generates a plurality of gamma voltages according to the gamma reference voltages output by the gamma reference voltage end; the first input end of the voltage comparison circuit is connected to the gamma reference voltage end, the second input end of the voltage comparison circuit is connected to the input voltage end, the output end of the voltage comparison circuit is connected to the gamma voltage generation circuit, and the voltage comparison circuit controls connection or disconnection between the gamma voltage generation circuit and the gamma reference voltage end according to the comparison result of the input voltage and the gamma reference voltage.
Optionally, the voltage comparison circuit includes a first switch and a voltage comparator, an input terminal of the first switch is connected to the gamma reference voltage terminal, and an output terminal of the first switch is connected to an input terminal of the gamma voltage generation circuit;
the first input end of the voltage comparator is used for receiving the gamma reference voltage end, the second input end of the voltage comparator is used for receiving an input voltage end, the output end of the voltage comparator is connected with the control end of the first switch, the voltage comparator compares the gamma reference voltage end received by the first input end with the input voltage end received by the second input end, and outputs a comparison result to the first switch through the output end so as to control the first switch to be switched on or switched off.
Optionally, the preset voltage of the gamma reference voltage end is greater than the preset voltage of the input voltage end, and the preset voltage of the gamma reference voltage end is 1.14-1.5 times of the preset voltage of the input voltage end.
Optionally, the gamma adjusting circuit further includes a second switch, the input voltage end is connected to the input end of the second switch, the second input end of the voltage comparator is connected to the output end of the second switch, the control end of the second switch receives a logic voltage, and the second switch is turned on when the logic voltage reaches a threshold value at which the second switch is turned on, so as to communicate the input voltage end with the voltage comparator.
Optionally, the gamma adjusting circuit further includes a first resistor, a second resistor, and a zener diode, the input voltage terminal is respectively connected to the input terminal of the first resistor and the input terminal of the second resistor, the output terminal of the first resistor is connected to the input terminal of the second switch, the output terminal of the second resistor is connected to the input terminal of the second switch, and the second resistor is set as an adjustable resistor;
the input end of the voltage stabilizing diode is connected with the output end of the second resistor, and the output end of the voltage stabilizing diode is connected with the input end of the second switch.
Optionally, the gamma adjusting circuit further includes a protection resistor, an input end of the protection resistor is connected to the gamma reference voltage terminal, and an output end of the protection resistor is connected to the first input end of the voltage comparator.
Optionally, the gamma adjusting circuit further includes a second switch and a PWM control unit, the PWM control unit generates a PWM control signal, the input voltage end is connected to the input end of the second switch, the second input end of the voltage comparator is connected to the output end of the second switch, the control end of the second switch receives the PWM control signal, and the voltage corresponding to the PWM control signal is conducted to the second switch when reaching the threshold value of the conduction of the second switch, so as to communicate the input voltage end with the voltage comparator.
Optionally, the gamma regulating circuit still includes electric capacity and inductance, the input of electric capacity with the output of input voltage end is connected, the output ground connection of electric capacity sets up, the input of inductance with the input voltage end is connected, the output of inductance with the input of second switch is connected.
Optionally, the preset voltage of the input voltage end is 12V, the preset voltage of the gamma reference voltage end is 16V, and the gamma reference voltage end is generated by boosting the input voltage end.
The application also discloses a driving method applied to the gamma regulating circuit, which comprises the following steps:
the gamma regulating circuit is connected with the input voltage end;
the first input end of the voltage comparison circuit is connected with a gamma reference voltage end, the second input end of the voltage comparison circuit is connected with an input voltage end, the input voltage and the gamma reference voltage are compared, and when the gamma reference voltage is larger than the input voltage, the voltage comparison circuit controls the gamma voltage generation circuit to be communicated with the gamma reference voltage end; or when the gamma reference voltage is smaller than the input voltage, the voltage comparison circuit controls the gamma voltage generation circuit to cut off the connection between the gamma voltage generation circuit and the gamma reference voltage end;
the gamma voltage generating circuit generates a plurality of gamma voltages from the gamma reference voltages.
This application sets up voltage comparison circuit in gamma regulating circuit, voltage comparison circuit's first input is connected in gamma reference voltage end, voltage comparison circuit's second input is connected in the input voltage end, voltage comparison circuit's output is connected in gamma voltage generation circuit, voltage comparison circuit controls the intercommunication between gamma voltage generation circuit and the gamma reference voltage end according to the big or small relation between the input voltage of input voltage end output and the gamma reference voltage of gamma reference voltage end output, effectively keep apart gamma reference voltage end and gamma voltage generation circuit, prevent that the gamma reference voltage of gamma reference voltage end output and the gamma voltage of gamma voltage generation circuit from influencing each other before reaching the default and causing the display effect not good.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a gamma adjusting circuit according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a gamma adjusting circuit according to a second embodiment of the present application;
FIG. 3 is a schematic diagram of a gamma adjusting circuit according to a third embodiment of the present application;
fig. 4 is a step diagram of a driving method of a fourth embodiment of the present application.
100, a gamma regulating circuit; 110. a voltage comparison circuit; 120. an input voltage terminal; 130. a gamma reference voltage terminal; 200. a gamma voltage generating circuit.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application will now be described in detail with reference to the drawings and alternative embodiments, it being understood that any combination of the various embodiments or technical features described below may form new embodiments without conflict.
As shown in fig. 1, as a first embodiment of the present application, a gamma adjusting circuit 100 is disclosed, the gamma adjusting circuit 100 includes an input voltage terminal 120, a gamma reference voltage terminal 130, a gamma voltage generating circuit 200 and a voltage comparing circuit 110, the input voltage terminal 120 outputs an input voltage VIN, the gamma reference voltage terminal 130 outputs a gamma reference voltage AVDD, an input terminal of the gamma voltage generating circuit 200 is connected to the gamma reference voltage terminal 130, the gamma voltage generating circuit 200 generates a plurality of gamma voltages according to the gamma reference voltage AVDD output by the gamma reference voltage terminal 130, a first input terminal of the voltage comparing circuit 110 is connected to the gamma reference voltage terminal 130, a second input terminal of the voltage comparing circuit 110 is connected to the input voltage terminal 120, an output terminal of the voltage comparing circuit 110 is connected to the gamma voltage generating circuit 200, the voltage comparison circuit 110 controls connection or disconnection between the gamma voltage generation circuit 200 and the gamma reference voltage terminal 130 according to the comparison result between the input voltage VIN and the gamma reference voltage AVDD;
after the device is powered on, the voltage comparison circuit 110 receives the input voltage VIN and the gamma reference voltage AVDD, the voltage comparison circuit 110 compares the received input voltage VIN with the gamma reference voltage AVDD, and controls the gamma reference voltage terminal 130 and the gamma voltage generation circuit 200 to be turned on or off according to a comparison result; when the gamma reference voltage terminal 130 and the gamma voltage generating circuit 200 are controlled to be on, the gamma voltage generating circuit 200 generates a gamma voltage according to the gamma reference voltage AVDD.
The input voltage VIN is greater than 0 and smaller than a preset voltage of the gamma reference voltage AVDD; after starting up, the gamma reference voltage AVDD starts to be boosted from 0V to a preset voltage; in this embodiment, the preset voltage of the input voltage VIN is 12V, the preset voltage of the gamma reference voltage AVDD is 16V, the gamma reference voltage AVDD is generated by boosting the input voltage VIN, the input voltage is a VIN voltage, the gamma reference voltage is an AVDD voltage, the AVDD voltage is obtained by boosting the VIN voltage, and when the VIN voltage is stable, the AVDD voltage starts to climb; the voltage comparison circuit 110 controls the gamma reference voltage terminal and the gamma voltage generation circuit 200 to be turned on or off according to the magnitude relation of the comparison VIN voltage and the AVDD voltage, and when the VIN voltage is greater than the AVDD voltage, the gamma reference voltage terminal and the gamma voltage generation circuit 200 keep a turn-off state; when the VIN voltage is less than the AVDD voltage, the gamma reference voltage end is connected to the gamma voltage generating circuit 200, the gamma voltage generating circuit 200 starts to work to generate the gamma voltage, and the voltage comparing circuit 110 is configured to effectively isolate the gamma reference voltage end from the gamma voltage generating circuit 200, so as to prevent the gamma reference voltage AVDD and the gamma voltage generating circuit 200 from affecting each other before reaching a rated value, thereby preventing poor display effect.
As shown in fig. 2, as a second embodiment of the present application, as a refinement of the first embodiment, a gamma adjusting circuit 100 is disclosed, where the voltage comparing circuit 110 includes a first switch Q1 and a voltage comparator IC1, the voltage comparator IC1 includes a first input terminal, a second input terminal, and an output terminal, the gamma adjusting circuit 100 includes a second switch Q2, a first resistor R1, a second resistor R2, a zener diode D1, a protection resistor R6, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, where in the present embodiment, the first switch Q1 and the second switch Q2 are both NMOS transistors, the second resistor R2 is an adjustable resistor, and the second resistor R2 is a sliding rheostat;
an input voltage VIN is respectively output to an input end of a first resistor R1 and an input end of a second resistor R2, an output end of the first resistor R1 is connected with an input end of the second switch Q2, the first resistor R1 is used for current limiting action of the input voltage VIN, an output end of the second resistor R2 is respectively connected to a ground end and an input end of the zener diode D1, an output end of the zener diode D1 is connected with an input end of the second switch Q2, an output end of the second switch Q2 is connected with a second input end of the voltage comparator IC1, a control end of the second switch Q2 is connected with a logic voltage Vdd, the logic voltage Vdd is used for controlling the second switch Q2, so that the second switch Q2 controls the connection or the connection between the input voltage end 120 and the voltage comparator IC1, the logic voltage Vdd begins to climb after the input voltage output is stabilized, the input voltage VIN, the logic voltage Vdd and the gamma reference voltage AVDD are in a time sequence of the input voltage VIN, the logic voltage Vdd and the gamma reference voltage AVDD, and when the logic voltage does not reach a preset value, the gamma reference voltage AVDD does not start to climb, wherein the logic voltage Vdd is smaller than the input voltage VIN, the logic voltage Vdd is 3.3V in the embodiment, and when the logic voltage Vdd reaches a rated value of 3.3V, the second switch Q2 controls the input voltage end 120 and the voltage comparator IC1 to be turned on; on the contrary, when the logic voltage Vdd does not reach 3.3V, the second switch Q2 controls the input voltage terminal 120 and the voltage comparator IC1 to be turned off;
the gamma reference voltage AVDD is respectively output to an input end of a first switch Q1 and an input end of a protection resistor R6, an output end of the protection resistor R6 is respectively connected to input ends of a third resistor R3, a fourth resistor R4 and a fifth resistor R5, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are arranged in parallel, of course, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 can be arranged in series, a user can also set more third resistors R3, fourth resistors R4 and fifth resistors R5 according to actual needs, and specific setting is not described herein; the output ends of the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected to a first input end of the voltage comparator IC1, the output end of the voltage comparator IC1 is connected to a control end of the first switch Q1, the output end of the first switch Q1 is connected to the gamma voltage generating circuit 200, the voltage comparator IC1 controls the on or off of the first switch Q1 according to the comparison result of the input voltage VIN and the gamma reference voltage AVDD, and when the first switch Q1 is turned on, the gamma voltage generating circuit 200 receives the gamma reference voltage AVDD to generate a gamma voltage for output; the comparison error of the voltage comparator IC1 is less than or equal to 0.2V, the first input terminal of the voltage comparator is a common-direction terminal, the second input terminal of the voltage comparator is an opposite-direction terminal, and the protection resistor R6 may be 100 ohms.
Specifically, when the gamma reference voltage AVDD received by the first input terminal of the voltage comparator IC1 is greater than the input voltage VIN received by the second input terminal, the voltage comparator IC1 outputs a high level signal, and when the first switch Q1 receives a high level signal, the first switch Q1 is turned on, the gamma reference voltage AVDD is input to the gamma voltage generating circuit 200, and the gamma voltage generating circuit 200 starts to operate to generate a gamma voltage; when the gamma reference voltage AVDD received by the first input terminal of the voltage comparator IC1 is smaller than the input voltage VIN received by the second input terminal, the voltage comparator IC1 outputs a low level signal, and when the first switch Q1 receives a low level signal, the first switch Q1 is turned off, the gamma reference voltage AVDD is not input to the gamma voltage generating circuit 200, and the gamma reference voltage AVDD and the gamma voltage generating circuit 200 do not interfere with each other, wherein the first input terminal of the voltage comparator IC1 is a positive input terminal, and the second input terminal of the voltage comparator IC1 is a negative input terminal.
The gamma adjusting circuit 100 is further provided with a reserved resistor R0, the logic voltage Vdd is connected to the input end of the reserved resistor R0, the output end of the reserved resistor R0 is connected to the control end of the second switch Q2, and the reserved resistor R0 is detachably arranged on the gamma adjusting circuit 100 to control the connection of the logic voltage Vdd and the second switch Q2, so as to control the switching of the gamma adjusting circuit 100.
As shown in fig. 3, as a third embodiment of the present application, different from the second embodiment, a gamma adjusting circuit 100 is disclosed, wherein the gamma adjusting circuit 100 further includes a PWM control unit, and an output terminal of the PWM control unit is connected to a control terminal of the second switch Q2; the gamma adjusting circuit 100 further includes a capacitor C1, an inductor L1, and a diode D2, wherein an input terminal of the capacitor C1 is connected to an output terminal of the diode D2 and a second input terminal of the voltage comparator IC1, an output terminal of the capacitor C1 is grounded, an input terminal of the inductor L1 is connected to the input voltage terminal 120 and an output terminal of the zener diode D1, an output terminal of the inductor L1 is connected to an input terminal of the second switch Q2, and an output terminal of the second switch Q2 is connected to an input terminal of the diode D2;
the PWM control unit controls the on/off time of the second switch Q2 by generating a PWM control signal to control the duty ratio of the second switch Q2 to control the charging time of the capacitor C1, thereby controlling the voltage received at the second input terminal of the voltage comparator IC 1.
As shown in fig. 4, as a fourth embodiment of the present application, a driving method is disclosed, which is applied to the gamma adjusting circuit according to any one of the above embodiments, and includes the following steps:
the gamma regulating circuit is connected with the input voltage end;
the first input end of the voltage comparison circuit is connected with a gamma reference voltage end, the second input end of the voltage comparison circuit is connected with an input voltage end, the input voltage and the gamma reference voltage are compared, and when the gamma reference voltage is larger than the input voltage, the voltage comparison circuit controls the gamma voltage generation circuit to be communicated with the gamma reference voltage end; or when the gamma reference voltage is smaller than the input voltage, the voltage comparison circuit controls the gamma voltage generation circuit to cut off the connection between the gamma voltage generation circuit and the gamma reference voltage end;
the gamma voltage generating circuit generates a plurality of gamma voltages from the gamma reference voltages.
More specifically, the driving method includes the steps of:
s01: the second switch is conducted when the second switch reaches a preset condition;
s02: the second switch outputs the input voltage to the first input end of the voltage comparator;
s03: the first input end of the voltage comparator receives a gamma reference voltage, the second input end of the voltage comparator receives an input voltage, the input voltage and the gamma reference voltage are compared, and when the gamma reference voltage is greater than the input voltage, the voltage comparator outputs a high-level signal; or when the gamma reference voltage is less than the input voltage, the voltage comparator outputs a low level signal;
s04: the first switch receives the high-level signal, is conducted and supplies power to the gamma voltage generating circuit from the gamma reference voltage; or the first switch receives the low level signal and is cut off;
s05: the gamma voltage generating circuit generates a plurality of gamma voltages from the gamma reference voltages.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A gamma adjustment circuit, the gamma adjustment circuit comprising:
an input voltage terminal outputting an input voltage;
a gamma reference voltage terminal outputting a gamma reference voltage;
a gamma voltage generating circuit, an input terminal of the gamma voltage generating circuit being connected to the gamma reference voltage terminal, the gamma voltage generating circuit generating a plurality of gamma voltages according to the gamma reference voltages outputted from the gamma reference voltage terminal; and
and a voltage comparison circuit, a first input end of which is connected to the gamma reference voltage terminal, a second input end of which is connected to the input voltage terminal, an output end of which is connected to the gamma voltage generation circuit, and the voltage comparison circuit controls connection or disconnection between the gamma voltage generation circuit and the gamma reference voltage terminal according to a comparison result between the input voltage and the gamma reference voltage.
2. The gamma adjustment circuit of claim 1, wherein the voltage comparison circuit comprises a first switch and a voltage comparator, wherein an input terminal of the first switch is connected to the gamma reference voltage terminal, and an output terminal of the first switch is connected to an input terminal of the gamma voltage generation circuit;
the first input end of the voltage comparator is used for receiving the gamma reference voltage end, the second input end of the voltage comparator is used for receiving an input voltage end, the output end of the voltage comparator is connected with the control end of the first switch, the voltage comparator compares the gamma reference voltage end received by the first input end with the input voltage end received by the second input end, and outputs a comparison result to the first switch through the output end so as to control the first switch to be switched on or switched off.
3. The gamma adjustment circuit of claim 1, wherein the predetermined voltage of the gamma reference voltage terminal is greater than the predetermined voltage of the input voltage terminal, and the predetermined voltage of the gamma reference voltage terminal is 1.14-1.5 times the predetermined voltage of the input voltage terminal.
4. The gamma regulating circuit of claim 1, further comprising a second switch, wherein the input voltage terminal is connected to an input terminal of the second switch, wherein a second input terminal of the voltage comparator is connected to an output terminal of the second switch, and wherein a control terminal of the second switch receives a logic voltage, and wherein the logic voltage turns on the second switch when reaching a threshold value at which the second switch turns on to connect the input voltage terminal to the voltage comparator.
5. The gamma adjusting circuit of claim 1, further comprising a first resistor, a second resistor and a zener diode, wherein the input voltage terminal is connected to the input terminal of the first resistor and the input terminal of the second resistor, respectively, the output terminal of the first resistor is connected to the input terminal of the second switch, the output terminal of the second resistor is connected to the input terminal of the second switch, and the second resistor is provided as an adjustable resistor;
the input end of the voltage stabilizing diode is connected with the output end of the second resistor, and the output end of the voltage stabilizing diode is connected with the input end of the second switch.
6. The gamma regulating circuit of claim 2, further comprising a protection resistor having an input connected to the gamma reference voltage terminal and an output connected to the first input of the voltage comparator.
7. The gamma adjusting circuit of claim 4, further comprising a second switch and a PWM control unit, wherein the PWM control unit generates the PWM control signal, the input voltage terminal is connected to an input terminal of the second switch, a second input terminal of the voltage comparator is connected to an output terminal of the second switch, a control terminal of the second switch receives the PWM control signal, and the second switch is turned on when a voltage corresponding to the PWM control signal reaches a threshold value at which the second switch is turned on, so as to connect the input voltage terminal to the voltage comparator.
8. The gamma regulating circuit of claim 7, further comprising a capacitor and an inductor, wherein an input terminal of the capacitor is connected to an output terminal of the input voltage terminal, an output terminal of the capacitor is grounded, an input terminal of the inductor is connected to the input voltage terminal, and an output terminal of the inductor is connected to an input terminal of the second switch.
9. The gamma adjustment circuit of claim 1, wherein the predetermined voltage of the input voltage terminal is 12V, the predetermined voltage of the gamma reference voltage terminal is 16V, and the gamma reference voltage terminal is boosted by the input voltage terminal.
10. A driving method applied to the gamma adjusting circuit as claimed in claims 1 to 9, comprising the steps of:
the gamma regulating circuit is connected with the input voltage end;
the first input end of the voltage comparison circuit is connected with a gamma reference voltage end, the second input end of the voltage comparison circuit is connected with an input voltage end, the input voltage and the gamma reference voltage are compared, and when the gamma reference voltage is larger than the input voltage, the voltage comparison circuit controls the gamma voltage generation circuit to be communicated with the gamma reference voltage end; or when the gamma reference voltage is smaller than the input voltage, the voltage comparison circuit controls the gamma voltage generation circuit to cut off the connection between the gamma voltage generation circuit and the gamma reference voltage end;
the gamma voltage generating circuit generates a plurality of gamma voltages from the gamma reference voltages.
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| CN111161687A (en) * | 2019-12-12 | 2020-05-15 | 广州视源电子科技股份有限公司 | Charge release method and device, storage medium and electronic equipment |
| CN212061814U (en) * | 2019-11-05 | 2020-12-01 | 昆山龙腾光电股份有限公司 | Gamma voltage adjusting circuit and display device |
| CN112927662A (en) * | 2021-03-09 | 2021-06-08 | 重庆惠科金渝光电科技有限公司 | Driving method and driving circuit of display panel |
| CN113129848A (en) * | 2021-03-18 | 2021-07-16 | 惠科股份有限公司 | Gamma voltage regulating circuit and gamma circuit |
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2021
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| KR20070073406A (en) * | 2006-01-05 | 2007-07-10 | 삼성전자주식회사 | Apparatus and method producing gamma voltage |
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| CN109036256A (en) * | 2018-09-30 | 2018-12-18 | 重庆惠科金渝光电科技有限公司 | Gamma electric voltage adjusts circuit and display device |
| CN109658896A (en) * | 2019-02-25 | 2019-04-19 | 京东方科技集团股份有限公司 | A kind of gamma electric voltage generative circuit, driving circuit and display device |
| CN212061814U (en) * | 2019-11-05 | 2020-12-01 | 昆山龙腾光电股份有限公司 | Gamma voltage adjusting circuit and display device |
| CN111161687A (en) * | 2019-12-12 | 2020-05-15 | 广州视源电子科技股份有限公司 | Charge release method and device, storage medium and electronic equipment |
| CN112927662A (en) * | 2021-03-09 | 2021-06-08 | 重庆惠科金渝光电科技有限公司 | Driving method and driving circuit of display panel |
| CN113129848A (en) * | 2021-03-18 | 2021-07-16 | 惠科股份有限公司 | Gamma voltage regulating circuit and gamma circuit |
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| Publication number | Publication date |
|---|---|
| CN113870760B (en) | 2022-06-07 |
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