CN113539150A - Backlight brightness control circuit and liquid crystal display screen detection equipment - Google Patents
Backlight brightness control circuit and liquid crystal display screen detection equipment Download PDFInfo
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- CN113539150A CN113539150A CN202110643012.6A CN202110643012A CN113539150A CN 113539150 A CN113539150 A CN 113539150A CN 202110643012 A CN202110643012 A CN 202110643012A CN 113539150 A CN113539150 A CN 113539150A
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- pwm signal
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 58
- 238000001514 detection method Methods 0.000 title abstract description 20
- 230000000694 effects Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention provides a circuit for controlling backlight brightness and an electronic device, wherein the circuit comprises a first control module, a second control module and a control module, wherein the first control module comprises a first input port, a second input port and an output port and is used for generating a first PWM signal and receiving a second PWM signal input by a liquid crystal display screen from the first input port, and the first PWM signal and the second PWM signal are both used for adjusting the backlight brightness of the liquid crystal display screen; the second control module is electrically connected with the second input port of the first control module and used for inputting a control instruction to the first control module so that the first control module outputs a first PWM signal or a second PWM signal according to the control instruction; and the input end of the backlight adjusting circuit is electrically connected with the output end of the first control module, and the output end of the backlight adjusting circuit is electrically connected with the input end of the liquid crystal display screen. The circuit can simultaneously complete the detection of the control effect of the backlight brightness of two backlight adjusting modes, and improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of liquid crystal display screen detection, in particular to a backlight brightness control circuit and liquid crystal display screen detection equipment.
Background
With the progress of science and technology and the rapid development of productivity, liquid crystal display screen detection equipment such as computers, televisions, tablet computers and the like is popularized in daily life of people, and great convenience is brought to the daily life of people.
The lcd is one of the important components of the lcd detection apparatus, and is used for displaying a picture required by a user, and the existing lcd automatically controls the Brightness of the backlight according to the Brightness of an image display signal in the process of practical application, so as to not only improve the display effect, but also save the power consumption of the backlight.
The existing backlight adjusting mode mainly comprises a host PWM signal adjusting mode and a liquid crystal display PWM signal adjusting mode, the existing liquid crystal display needs to detect the control effect of the backlight brightness before leaving the factory, however, the prior art can only detect the control effect of the backlight brightness of one of the backlight adjusting modes, so that the production efficiency of the liquid crystal display is reduced, and the liquid crystal display is not beneficial to large-scale production.
Disclosure of Invention
Based on this, the invention aims to provide a circuit for controlling backlight brightness and a liquid crystal display screen detection device, so as to solve the problem that the production efficiency of the liquid crystal display screen is reduced because the control effect of the backlight brightness of only one backlight adjustment mode can be detected in the prior art.
A circuit for controlling backlight brightness, comprising:
the first control module comprises a first input port, a second input port and an output port, is used for generating a first PWM signal, and is used for receiving a second PWM signal input by the first input port of the liquid crystal display screen, and the first PWM signal and the second PWM signal are both used for adjusting the backlight brightness of the liquid crystal display screen;
the second control module is electrically connected with the second input port of the first control module and used for inputting a control instruction to the first control module so that the first control module outputs a first PWM signal or a second PWM signal according to the control instruction;
and the input end of the backlight adjusting circuit is electrically connected with the output port of the first control module, and the output end of the backlight adjusting circuit is electrically connected with the input end of the liquid crystal display screen and is used for transmitting the first PWM signal or the second PWM signal into the liquid crystal display screen so as to adjust the backlight brightness of the liquid crystal display screen.
The invention has the beneficial effects that: by arranging the first control module, the second control module and the backlight adjusting circuit, the output end of the liquid crystal display is electrically connected with the first input port of the first control module, the input end of the liquid crystal display is electrically connected with the output end of the backlight adjusting circuit, the output end of the second control module is electrically connected with the second input port of the first control module, during detection, the first control module can generate a first PWM signal and can receive a second PWM signal input by the liquid crystal display, meanwhile, the second control module can input a control instruction to the first control module, the control instruction can enable the first control module to output the first PWM signal or the second PWM signal, and then the first PWM signal or the second PWM signal is transmitted to the liquid crystal display through the backlight adjusting circuit so as to respectively complete detection of two PWM signals of the liquid crystal display, thereby simultaneously completing detection of control effects of backlight brightness of two backlight adjusting modes, the production efficiency of the liquid crystal display screen is improved.
Preferably, the first control module includes a first control chip, and a control register, a PWM signal selector, a first PWM signal generator, and a second PWM signal detector which are disposed in the first control chip, the control register, the first PWM signal generator, and the second PWM signal detector are electrically connected to the PWM signal selector, respectively, the first PWM signal generator is configured to generate the first PWM signal, and the second PWM signal detector receives the second PWM signal input by the liquid crystal display screen through the first input port and transmits the second PWM signal to the PWM signal selector.
Preferably, the second control module includes a second control chip, and the second control chip is electrically connected to the control register through the second input port and inputs the control instruction to the control register.
Preferably, the backlight module further comprises a filter circuit, and the filter circuit is electrically connected with the backlight adjusting circuit.
Preferably, the backlight module further comprises an overload protection circuit, and the overload protection circuit is electrically connected with the backlight adjusting circuit.
Preferably, the model of the first control chip is EP4CE10F17C 6.
Preferably, the model of the second control chip is STM32F407 ZG.
Another object of the present invention is to provide a liquid crystal display panel inspection apparatus, which, when implemented, includes the above-mentioned backlight brightness control circuit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a circuit for controlling backlight brightness according to a first embodiment of the present invention.
Fig. 2 is a schematic circuit structure diagram of a circuit for controlling backlight brightness according to a first embodiment of the present invention.
Description of the main element symbols:
the following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 2, a circuit for controlling backlight brightness according to a first embodiment of the present invention is shown, which mainly includes a first control module 10, a second control module 20, and a backlight adjusting circuit 30.
Specifically, the backlight brightness control circuit comprises:
the first control module 10 includes a first input port 11, a second input port 12, and an output port 13, and is configured to generate a first PWM signal and receive a second PWM signal input by the first input port 11 to the liquid crystal display 40, where the first PWM signal and the second PWM signal are both used to adjust backlight brightness of the liquid crystal display 40;
the second control module 20 is electrically connected to the second input port 12 of the first control module 10, and is configured to input a control instruction to the first control module 10, so that the first control module 10 outputs a first PWM signal or a second PWM signal according to the control instruction;
and an input end of the backlight adjusting circuit 30 is electrically connected to the output port 13 of the first control module 10, and an output end of the backlight adjusting circuit 30 is electrically connected to an input end of the liquid crystal display 40, and is configured to transmit the first PWM signal or the second PWM signal to the liquid crystal display 40, so as to adjust the backlight brightness of the liquid crystal display 40.
In the present embodiment, as shown in fig. 2, for convenience of implementation, a first input port 11 and a second input port 12 are respectively provided at one end of the first control module 10, and an output port 13 is provided at the other end of the first control module 10. In this embodiment, it should be noted that the first control module 10 can generate a first PWM signal (i.e., a host PWM signal), the liquid crystal display 40 can generate a second PWM signal (i.e., a liquid crystal display PWM signal), and can transmit the second PWM signal into the first control module 10, and both of the two PWM signals can be used to adjust the backlight brightness of the liquid crystal display. In addition, the second control module 20 can generate a control instruction, and transmit the control instruction to the first control module 10, so that the first control module 10 outputs a first PWM signal or a second PWM signal according to the control instruction, and finally transmit the first PWM signal or the second PWM signal to the liquid crystal display 40 through the backlight adjusting circuit 30, so as to adjust the backlight brightness of the liquid crystal display 40, and to respectively complete the detection of the two PWM signals of the liquid crystal display 40, so that the detection of the control effect of the backlight brightness of the two backlight adjusting modes can be simultaneously completed, and the production efficiency of the liquid crystal display 40 is improved.
Specifically, in this embodiment, for convenience of implementation, it is noted that the first control module 10 includes a first control chip 14, and a control register 141, a PWM signal selector 142, a first PWM signal generator 143, and a second PWM signal detector 144 disposed in the first control chip 14, when installed, as shown in fig. 1, the control register 141, the first PWM signal generator 143, and the second PWM signal detector 144 are respectively electrically connected to the PWM signal selector 142, the first PWM signal generator 143 is configured to generate a first PWM signal, and the second PWM signal detector 144 receives a second PWM signal input by the liquid crystal display 40 through the first input port 11 and transmits the second PWM signal to the PWM signal selector 142. In addition, the second control module 20 includes a second control chip 21, and the second control chip 21 can be electrically connected to the control register 141 through the second input port 12 and input the control instruction to the control register 141. The second PWM signal detector 144 is used for detecting the frequency and duty ratio of the second PWM signal. The PWM signal selector 142 can select a PWM signal to be output according to the signal output from the control register 141.
More specifically, in this embodiment, it should be noted that the first control chip 14 is an FPGA chip, and its specific model is EP4CE10F17C 6. The method and the device have the advantages that the VHDL language is designed, synthesized, adapted, time sequence optimized and the netlist is generated and then programmed into the first control chip 14, so that the first control chip 14 is optimized to a certain extent, the first PWM signal and the second PWM signal can be stored in the first control chip 14 at the same time, and the first PWM signal and the second PWM signal are selectively processed to output the first PWM signal and the second PWM signal respectively.
In this embodiment, the second control chip 21 is an ARM chip, and its specific model is STM32F407 ZG. In the present embodiment, the second control chip 21 is enabled to output the above control instruction by programming the language C in the second control chip 21, and the control instruction is transmitted into the control register 141 through the second input port 12. In this embodiment, when the control register 141 receives the control command, the control register 141 immediately sets the PWM signal to be selected, wherein when the control command is "0", the first PWM signal is selected to adjust the backlight of the liquid crystal display; and when the control instruction is 1, selecting the second PWM signal to adjust the backlight of the liquid crystal display screen.
In this embodiment, in the detection process, in order to prevent the interference from the external signal, the circuit for controlling the backlight brightness further includes a filter circuit, and the filter circuit is electrically connected to the backlight adjusting circuit 30 during installation. Specifically, the filter circuit is composed of filter capacitors connected in parallel. In this embodiment, in order to avoid the circuit damage during the detection process, the circuit for controlling the backlight brightness further includes an overload protection circuit, which is electrically connected to the backlight adjusting circuit 30. Specifically, the overload protection circuit includes an overload protector electrically connected to the backlight adjusting circuit 30.
In specific implementation, by providing the first control module 10, the second control module 20 and the backlight adjusting circuit 30, and electrically connecting the output terminal of the liquid crystal display 40 with the first input port 11 of the first control module 10, electrically connecting the input terminal of the liquid crystal display 40 with the output terminal of the backlight adjusting circuit 30, and electrically connecting the output terminal of the second control module 20 with the second input port 12 of the first control module 10, during detection, the first control module 10 can generate the first PWM signal and can receive the second PWM signal input by the liquid crystal display 40, and at the same time, the second control module 20 can input a control instruction to the first control module 10, the control instruction can enable the first control module 10 to output the first PWM signal or the second PWM signal, and then transmit the first PWM signal or the second PWM signal to the liquid crystal display 40 through the backlight adjusting circuit 30, the detection of two PWM signals of the liquid crystal display screen 40 is respectively completed, so that the detection of the control effect of the backlight brightness of two backlight adjusting modes can be simultaneously completed, and the production efficiency of the liquid crystal display screen 40 is improved.
It should be noted that the above implementation process is only for illustrating the applicability of the present application, but this does not represent that the backlight brightness control circuit of the present application has only the above implementation flow, and on the contrary, the backlight brightness control circuit of the present application can be incorporated into the feasible embodiments of the present application as long as it can be implemented.
A second embodiment of the present invention provides a liquid crystal display panel inspection apparatus, which, when implemented, includes the backlight brightness control circuit provided in the first embodiment described above.
In summary, the backlight brightness control circuit in the above embodiment of the present invention can respectively complete the detection of two PWM signals of the liquid crystal display 40, so as to simultaneously complete the detection of the backlight brightness control effect of two backlight adjustment modes, thereby improving the production efficiency of the liquid crystal display 40, and facilitating the mass production.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," 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 above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A circuit for controlling backlight brightness, comprising:
the first control module comprises a first input port, a second input port and an output port, is used for generating a first PWM signal, and is used for receiving a second PWM signal input by the first input port of the liquid crystal display screen, and the first PWM signal and the second PWM signal are both used for adjusting the backlight brightness of the liquid crystal display screen;
the second control module is electrically connected with the second input port of the first control module and used for inputting a control instruction to the first control module so that the first control module outputs a first PWM signal or a second PWM signal according to the control instruction;
and the input end of the backlight adjusting circuit is electrically connected with the output port of the first control module, and the output end of the backlight adjusting circuit is electrically connected with the input end of the liquid crystal display screen and is used for transmitting the first PWM signal or the second PWM signal into the liquid crystal display screen so as to adjust the backlight brightness of the liquid crystal display screen.
2. The circuit of claim 1, wherein: the first control module comprises a first control chip, a control register, a PWM signal selector, a first PWM signal generator and a second PWM signal detector, wherein the control register, the PWM signal selector, the first PWM signal generator and the second PWM signal detector are arranged in the first control chip and are respectively electrically connected with the PWM signal selector, the first PWM signal generator is used for generating a first PWM signal, and the second PWM signal detector receives a second PWM signal input by the liquid crystal display screen through the first input port and transmits the second PWM signal to the PWM signal selector.
3. The circuit of claim 2, wherein: the second control module comprises a second control chip which is electrically connected with the control register through the second input port and inputs the control instruction to the control register.
4. The circuit of claim 1, wherein: the backlight adjusting circuit is electrically connected with the backlight adjusting circuit.
5. The circuit of claim 1, wherein: the backlight adjusting circuit is characterized by further comprising an overload protection circuit, wherein the overload protection circuit is electrically connected with the backlight adjusting circuit.
6. The circuit of claim 2, wherein: the model of the first control chip is EP4CE10F17C 6.
7. The circuit of claim 3, wherein: the model of the second control chip is STM32F407 ZG.
8. The utility model provides a liquid crystal display check out test set which characterized in that: comprising a circuit for controlling backlight brightness as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643012.6A CN113539150A (en) | 2021-06-09 | 2021-06-09 | Backlight brightness control circuit and liquid crystal display screen detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643012.6A CN113539150A (en) | 2021-06-09 | 2021-06-09 | Backlight brightness control circuit and liquid crystal display screen detection equipment |
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| CN113539150A true CN113539150A (en) | 2021-10-22 |
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| CN202110643012.6A Pending CN113539150A (en) | 2021-06-09 | 2021-06-09 | Backlight brightness control circuit and liquid crystal display screen detection equipment |
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