CN212782680U - Dynamic gamma adjusting circuit - Google Patents
Dynamic gamma adjusting circuit Download PDFInfo
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- CN212782680U CN212782680U CN202022082550.6U CN202022082550U CN212782680U CN 212782680 U CN212782680 U CN 212782680U CN 202022082550 U CN202022082550 U CN 202022082550U CN 212782680 U CN212782680 U CN 212782680U
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Abstract
The utility model discloses a developments gamma adjusting circuit relates to adjusting circuit technical field. The utility model discloses an image data and gamma reference voltage generator, the output wire connection of image data developments gamma correction circuit and the input of AD converter, the input of the output wire connection AD converter of developments gamma correction circuit, the output wire connection LCD's of AD converter input, the input of luminance feedback circuit is connected to LCD's output, the input of luminance feedback circuit's output wire connection analyzer, the input of the output connection voltage selector of gamma reference voltage generator. The utility model discloses a set up developments gamma correction circuit, can remove dynamic adjustment gamma reference voltage according to the image data of picture, let the display frame have more level, more fine and smooth, the utility model discloses a set up filter circuit, the frequency that the filtering that can be convenient is not needed to avoid being disturbed.
Description
Technical Field
The utility model belongs to the technical field of the adjusting circuit, especially, relate to a developments gamma adjusting circuit.
Background
The conventional LCD driver display includes GAMMA (GAMMA), digital-to-analog converter (DAC), and LCD Monitor (liquid crystal display), wherein the GAMMA is responsible for generating a reference voltage to the digital-to-analog converter (DAC). A digital/analog converter (DAC) selects an analog voltage and sends the voltage to the LCD monitor by an internal amplifier (OP). The conventional GAMMA reference voltage is fixed, and cannot be dynamically adjusted according to the data of the display screen.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a developments gamma adjustment circuit to current problem has been solved: the GAMMA reference voltage is fixed, and cannot be dynamically adjusted according to the data of the display screen.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to a dynamic gamma adjustment circuit, which comprises an image data and a gamma reference voltage generator, the output terminal of the image data is connected to the input terminal of the dynamic gamma correction circuit and the A/D converter through wires, the output end of the dynamic gamma correction circuit is connected with the input end of the A/D converter through an electric wire, the output end of the A/D converter is connected with the input end of the liquid crystal display through an electric wire, the output end of the liquid crystal display is connected with the input end of the brightness feedback circuit, the output end of the brightness feedback circuit is connected with the input end of an analyzer through a wire, the output end of the analyzer is connected with the input end of a gamma reference voltage generator through a wire, the output end of the gamma reference voltage generator is connected with the input end of the voltage selector, and the output end of the voltage selector is connected with the input end of the dynamic gamma correction circuit.
Furthermore, a voltage reduction circuit, a voltage boosting circuit and a power supply signal are arranged in the gamma reference voltage generator, the power supply signal in the gamma reference voltage generator adopts a positive current source and a negative current source which are connected in parallel with the output end of the analyzer, the voltage reduction circuit and the voltage boosting circuit are installed in parallel at the output end of the power supply signal in the gamma reference voltage generator, and the output ends of the voltage reduction circuit and the voltage boosting circuit are both connected with the input end of the voltage selector.
Furthermore, a PWM signal input module, an RC filtering module, a conversion module, and an operational amplification module are disposed inside the a/D converter, an input end circuit of the dynamic gamma correction circuit is connected to the PWM signal input module, an output end circuit of the PWM signal input module is connected to an input end of the RC filtering module, an output end circuit of the RC filtering module is connected to an input end of the conversion module, and an output end circuit of the conversion module is connected to an input end of the operational amplification module.
Furthermore, a negative feedback amplifier and a sensing device are arranged in the brightness feedback circuit, the sensing device of the brightness feedback circuit is a photosensitive sensor, and the sensing device is arranged in the liquid crystal display.
Furthermore, an amplifier is arranged in the operational amplification module, the amplifier is a triode amplifier, and the amplifier is a voltage type amplifier.
Further, the RC filtering module is a high-pass filtering circuit, and the maximum bandwidth of the pass frequency of the high-pass filtering circuit is 2WC
The utility model discloses following beneficial effect has:
1. the utility model discloses a set up developments gamma correction circuit, can remove dynamic adjustment gamma reference voltage according to the image data of picture, let the display screen have more levels, more fine and smooth.
2. The utility model discloses a set up filter circuit, the unnecessary frequency of filtering that can be convenient to avoid being disturbed.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a detailed circuit diagram of the A/D converter circuit of the present invention;
fig. 3 is a schematic diagram of the original circuit structure of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. image data; 2. a dynamic gamma correction circuit; 3. an A/D converter; 4. a liquid crystal display; 5. a brightness feedback circuit; 6. an analyzer; 7. a gamma reference voltage generator; 8. a voltage selector; 9. inputting a PWM signal into a module; 10. an RC filtering module; 11. a conversion module; 12. and an operational amplification module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Please refer to fig. 1-3, the present invention relates to a dynamic gamma adjusting circuit, which comprises an image data 1 and a gamma reference voltage generator 7, wherein the output end of the image data 1 is electrically connected to the input end of the dynamic gamma correcting circuit 2 and the a/D converter 3, the output end of the dynamic gamma correcting circuit 2 is electrically connected to the input end of the a/D converter 3, the output end of the a/D converter 3 is electrically connected to the input end of the liquid crystal display 4, the output end of the liquid crystal display 4 is connected to the input end of the brightness feedback circuit 5, the output end of the brightness feedback circuit 5 is electrically connected to the input end of the analyzer 6, the output end of the analyzer 6 is electrically connected to the input end of the gamma reference voltage generator 7, the output end of the gamma reference voltage generator 7 is connected to the input end of the voltage selector 8, and the output end of the voltage selector.
The gamma reference voltage generator 7 is internally provided with a voltage reduction circuit, a voltage boosting circuit and a power supply signal, the power supply signal in the gamma reference voltage generator 7 adopts a positive current source and a negative current source which are connected in parallel with the output end of the analyzer 6, the voltage reduction circuit and the voltage boosting circuit are installed in parallel at the output end of the power supply signal in the gamma reference voltage generator 7, and the output ends of the voltage reduction circuit and the voltage boosting circuit are both connected with the input end of the voltage selector 8 so as to compensate the dynamic gamma correction of the voltage.
The inside of the A/D converter 3 is provided with a PWM signal input module 9, an RC filter module 10, a conversion module 11 and an operational amplification module 12, the input end circuit of the dynamic gamma correction circuit 2 is connected with the PWM signal input module 9, the output end circuit of the PWM signal input module 9 is connected with the input end of the RC filter module 10, the output end circuit of the RC filter module 10 is connected with the input end of the conversion module 11, and the output end circuit of the conversion module 11 is connected with the input end of the operational amplification module 12, so that the digital-analog is more accurate and correct.
The brightness feedback circuit 5 is internally provided with a negative feedback amplifier and a sensing device, the sensing device of the brightness feedback circuit 5 is a photosensitive sensor, and the sensing device is arranged inside the liquid crystal display 4 so as to sense the brightness in time.
The operational amplification module 12 is internally provided with an amplifier which is a triode amplifier and a voltage type amplifier, so that the replacement is convenient and the price is low.
The RC filtering module 10 is a high-pass filtering circuit, the maximum bandwidth of the passing frequency of the high-pass filtering circuit is 2WC, and the required frequency band can be selected by the ratio of the RC.
One specific application of this embodiment is: before using, the external power circuit is turned on, the image data 1 transmits the data to the dynamic gamma correction circuit 2 and the A/D converter 3, the reference voltage value of the dynamic gamma correction circuit 2 is set, the data enters the input terminal of the A/D converter 3 after passing through the internal circuit of the dynamic gamma correction circuit 2, the input analog signal is converted into a digital signal through filtering and conversion by a PWM signal input module 9, an RCRC filtering module 10, a conversion module 11 and an operational amplification module 12 which pass through the inside of the A/D converter 3, and the amplified data is output to the input end of the liquid crystal display 4, the brightness feedback circuit 5 installed on the liquid crystal display 4 feeds back the brightness data of the liquid crystal display 4 to the analyzer 6 in real time, and the analyzer 6 performs statistics and distribution according to the image data 1 and the brightness feedback circuit 5 to control the gamma reference voltage generator 7 and the voltage selector 8.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. 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 its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A dynamic gamma adjusting circuit comprises image data (1) and a gamma reference voltage generator (7), wherein the output end of the image data (1) is connected with the input ends of a dynamic gamma correcting circuit (2) and an A/D converter (3) by wires, the output end of the dynamic gamma correcting circuit (2) is connected with the input end of the A/D converter (3) by wires, the output end of the A/D converter (3) is connected with the input end of a liquid crystal display (4) by wires, the output end of the liquid crystal display (4) is connected with the input end of a brightness feedback circuit (5), the output end of the brightness feedback circuit (5) is connected with the input end of an analyzer (6) by wires, the output end of the analyzer (6) is connected with the input end of the gamma reference voltage generator (7) by wires, the output end of the gamma reference voltage generator (7) is connected with the input end of a voltage selector (8), the output end of the voltage selector (8) is connected with the input end of the dynamic gamma correction circuit (2).
2. The dynamic gamma adjustment circuit according to claim 1, wherein the gamma reference voltage generator (7) is internally provided with a voltage reduction circuit, a voltage boost circuit and a power supply signal, the gamma reference voltage generator (7) internal power supply signal adopts a positive current source and a negative current source which are connected in parallel with the output end of the analyzer (6), the output end of the gamma reference voltage generator (7) internal power supply signal is provided with the voltage reduction circuit and the voltage boost circuit in parallel, and the output ends of the voltage reduction circuit and the voltage boost circuit are both connected with the input end of the voltage selector (8).
3. The dynamic gamma adjustment circuit according to claim 1, wherein a PWM signal input module (9), an RC filter module (10), a conversion module (11), and an operational amplifier module (12) are disposed inside the a/D converter (3), an input end of the dynamic gamma correction circuit (2) is electrically connected to the PWM signal input module (9), an output end of the PWM signal input module (9) is electrically connected to an input end of the RC filter module (10), an output end of the RC filter module (10) is electrically connected to an input end of the conversion module (11), and an output end of the conversion module (11) is electrically connected to an input end of the operational amplifier module (12).
4. The dynamic gamma adjustment circuit according to claim 1, wherein the brightness feedback circuit (5) is internally provided with a negative feedback amplifier and a sensing device, the sensing device of the brightness feedback circuit (5) is a photosensitive sensor, and the sensing device is installed inside the liquid crystal display (4).
5. The dynamic gamma adjustment circuit according to claim 3, wherein the operational amplifier module (12) is internally provided with an amplifier, the amplifier is a triode amplifier, and the amplifier is a voltage-type amplifier.
6. The dynamic gamma adjustment circuit according to claim 3, wherein the RC filter module (10) is a high-pass filter circuit having a maximum bandwidth of 2 WC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022082550.6U CN212782680U (en) | 2020-09-22 | 2020-09-22 | Dynamic gamma adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022082550.6U CN212782680U (en) | 2020-09-22 | 2020-09-22 | Dynamic gamma adjusting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212782680U true CN212782680U (en) | 2021-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022082550.6U Active CN212782680U (en) | 2020-09-22 | 2020-09-22 | Dynamic gamma adjusting circuit |
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| Country | Link |
|---|---|
| CN (1) | CN212782680U (en) |
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2020
- 2020-09-22 CN CN202022082550.6U patent/CN212782680U/en active Active
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