CN110267396B - Direct current negative dimming circuit and display device - Google Patents
Direct current negative dimming circuit and display device Download PDFInfo
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- CN110267396B CN110267396B CN201910509009.8A CN201910509009A CN110267396B CN 110267396 B CN110267396 B CN 110267396B CN 201910509009 A CN201910509009 A CN 201910509009A CN 110267396 B CN110267396 B CN 110267396B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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- H05B45/10—Controlling the intensity of the light
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Abstract
The invention discloses a direct-current negative dimming circuit and a display device, wherein the direct-current negative dimming circuit comprises a voltage division circuit and a comparison circuit, the input end of the voltage division circuit receives an analog voltage signal, the output end of the voltage division circuit is connected with the first input end of the comparison circuit, the second input end of the comparison circuit is connected with the output end of a main chip, and the output end of the comparison circuit is connected with the input end of a backlight module. According to the technical scheme, direct-current negative dimming can be realized.
Description
Technical Field
The invention relates to the technical field of display, in particular to a direct-current negative dimming circuit and a display device.
Background
The display device has two dimming modes, one is dc dimming and the other is PWM dimming.
The PWM dimming is to continuously switch on and off the current flowing through the LED lamp string through a high-frequency switch, and to realize brightness adjustment by controlling the on-duty ratio of the LED lamp string.
The direct current dimming realizes brightness adjustment by linearly adjusting the current of the LED lamp string. Most of the LED driving chips with analog dimming function require dc positive dimming (low level is dark, high level is bright), and for some main chips, dc negative dimming (low level is bright, high level is dark) is more beneficial to system design. However, the dimming signal of the main chip cannot be directly supplied to the LED backlight control chip, and thus the system cannot meet the requirement for dc negative dimming.
The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention provides a direct-current negative dimming circuit and a display device, and aims to realize direct-current negative dimming.
In order to achieve the above object, the present invention provides a dc negative dimming circuit, including:
the input end of the voltage division circuit receives an analog voltage signal; the voltage division circuit is configured to divide the analog voltage signal and output the divided analog voltage signal;
a first input end of the comparison circuit is connected with the output end of the voltage division circuit, a second input end of the comparison circuit is connected with the output end of the main chip, and the output end of the comparison circuit is connected with the input end of the backlight module; the comparison circuit is configured to output a second dimming signal of a high level to the backlight module when the value of the voltage signal input by the first input terminal is greater than the value of the first dimming signal input by the second input terminal;
the comparison circuit is further configured to output a second dimming signal of a low level to the backlight module when the value of the voltage signal input by the first input terminal is smaller than the value of the first dimming signal input by the second input terminal.
Optionally, the voltage dividing circuit includes a first resistor and a second resistor, a first end of the first resistor is an input end of the voltage dividing circuit, a second end of the first resistor is an output end of the voltage dividing circuit and is connected to a first end of the second resistor, and a second end of the second resistor is grounded.
Optionally, when the first dimming signal output by the main chip is at a high level, the value of the first dimming signal is greater than the value of the voltage signal output by the voltage dividing circuit.
Optionally, the comparator circuit includes a voltage comparator, a positive input end of the voltage comparator is a first input end of the comparator circuit, a negative input end of the voltage comparator is a second input end of the comparator circuit, and an output end of the voltage comparator is an output end of the comparator circuit.
Optionally, the comparison circuit further includes a third resistor, a first end of the third resistor is connected to the output end of the voltage comparator, and a second end of the third resistor is grounded.
Optionally, the comparison circuit further includes a first capacitor, one end of the first capacitor is connected to the output end of the voltage comparator, and the other end of the first capacitor is grounded.
Optionally, the positive power supply terminal of the voltage comparator receives a digital voltage signal, and the negative power supply terminal of the voltage comparator is grounded; the value of the high-level second dimming signal output by the voltage comparator is equal to the value of the digital voltage signal received by the positive power supply terminal of the voltage comparator, and the value of the low-level second dimming signal output by the voltage comparator is 0.
In order to achieve the above object, the present invention further provides a dc negative dimming circuit applied to a display device, the dc negative dimming circuit comprising:
the input end of the voltage division circuit receives an analog voltage signal; the voltage division circuit is configured to divide the analog voltage signal and output the divided analog voltage signal;
a first input end of the comparison circuit is connected with the output end of the voltage division circuit, a second input end of the comparison circuit is connected with the output end of the main chip, and the output end of the comparison circuit is connected with the input end of the backlight module; the comparison circuit is configured to output a second dimming signal of a high level to the backlight module when the value of the voltage signal input by the first input terminal is greater than the value of the first dimming signal input by the second input terminal; wherein a level of the first dimming signal is opposite to a level of the second dimming signal;
the comparison circuit is further configured to output a second dimming signal of a low level to the backlight module when the value of the voltage signal input by the first input terminal is smaller than the value of the first dimming signal input by the second input terminal.
In order to achieve the above object, the present invention further provides a display device, which includes the dc negative dimming circuit as described in any one of the above.
Optionally, the display device further includes a main chip and a backlight module, an output end of the main chip is connected to the second input end of the comparison circuit of the dc negative dimming circuit, and an input end of the backlight module is connected to an output end of the comparison circuit of the dc negative dimming circuit.
According to the technical scheme, a second input end of the comparison circuit receives a first dimming signal output by a main chip, and a first input end of the comparison circuit receives a voltage signal output by the voltage division circuit; when the first dimming signal output by the main chip is high, the comparison circuit outputs a second dimming signal with low level to the backlight module; when the first dimming signal output by the main chip is low, the comparison circuit outputs a second dimming signal with high level to the backlight module. Through setting up the comparison circuit, output the second dimming signal opposite with first dimming signal level to backlight unit to satisfy the system and to the requirement of direct current negative dimming.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of a dc negative dimming circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a dc negative dimming circuit according to an embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a direct current negative dimming circuit.
Referring to fig. 1, the dc negative dimming circuit includes a voltage divider circuit 10 and a comparator circuit 20, an input terminal of the voltage divider circuit 10 receives an analog voltage signal, an output terminal of the voltage divider circuit 10 is connected to a first input terminal of the comparator circuit 20, a second input terminal of the comparator circuit 20 is connected to an output terminal of a main chip 30, and an output terminal of the comparator circuit 30 is connected to an input terminal of a backlight module.
The voltage dividing circuit 10 can be realized by serially connecting a plurality of resistors for voltage division; the voltage divider circuit 10 is configured to divide an analog voltage signal provided by an external circuit and output the divided voltage signal to a first input terminal of the comparator circuit 20.
The comparison circuit 20 can be implemented by a circuit composed of comparators; a second input terminal of the comparison circuit 20 receives the first dimming signal output by the main chip 30. The characteristic of the comparison circuit 20 is that if the voltage of the first input terminal is greater than the voltage of the second input terminal, the comparison circuit 20 outputs a high level; if the voltage at the first input terminal is lower than the voltage at the second input terminal, the comparison circuit 20 outputs a low level.
The first dimming signal is a dimming signal in a square wave form, and the first dimming signal includes a high-level first dimming signal, for example, a 5V first dimming signal, and a low-level first dimming signal, for example, a 0V first dimming signal. The main chip is configured to output a first dimming signal, and the backlight module 40 is configured to provide a light source for the display panel.
In this embodiment, the input end of the voltage divider circuit 10 receives an analog voltage signal provided by an external circuit, such as a power supply, and the voltage divider circuit 10 divides the analog voltage signal and outputs the divided voltage signal to the first input end of the comparator circuit 20. The voltage signal output from the voltage divider circuit 10 to the comparator circuit 20 has a value smaller than the value of the high-level first dimming signal output from the main chip 30 through the circuit design of the voltage divider circuit 10, for example, if the high-level first dimming signal output from the main chip 30 is 5V, the value of the voltage signal output from the external circuit after voltage division by the voltage divider circuit 10 to the comparator circuit 20 is smaller than 5V, for example, may be 2V. A second input terminal of the comparison circuit 20 receives a first dimming signal output by the main chip 30, where the first dimming signal is a dimming signal in the form of a square wave. If the first dimming signal output by the main chip 30 is a low-level first dimming signal, for example, 0V, and the value of the low-level first dimming signal is smaller than the value of the voltage signal output by the voltage dividing circuit 10, for example, 2V, the comparing circuit 20 outputs a high-level second dimming signal to the backlight module 40, for example, outputs a 3.3V second dimming signal to the backlight module 40, so that the backlight module 40 is lit. If the first dimming signal output by the main chip 30 is a high-level first dimming signal, for example, 5V, and the value of the high-level first dimming signal is greater than the value of the voltage signal output by the voltage dividing circuit 10, the comparing circuit 20 outputs a low-level second dimming signal to the backlight module 40, for example, outputs a 0V second dimming signal to the backlight module 40, so as to dim the backlight module 40. Through the direct current negative dimming circuit, when the first dimming signal output by the main chip 30 is high, the second dimming signal input to the backlight module 40 is low, and the backlight module 40 is dark; when the first dimming signal output by the main chip 30 is low, the second dimming signal input to the backlight module 40 is high, and the backlight module 40 is bright.
In the technical solution of this embodiment, a voltage signal is provided to a first input terminal of the comparison circuit 20 through the voltage divider circuit 10, and a second input terminal of the comparison circuit 20 receives a first dimming signal output by the main chip 30; when the first dimming signal output by the main chip 30 is high, the comparison circuit 20 outputs a second dimming signal of a low level to the backlight module 40; when the first dimming signal output by the main chip 30 is low, the comparison circuit 20 outputs a high-level second dimming signal to the backlight module 40. By arranging the voltage dividing circuit 10 and the comparison circuit 20, the level of the second dimming signal input to the backlight module 40 is opposite to the level of the first dimming signal output by the main chip 30, so that the requirement of the system on the direct-current negative dimming is met.
In an embodiment, referring to fig. 2, the voltage divider circuit 10 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is an input end of the voltage divider circuit 10, a second end of the first resistor R1 is an output end of the voltage divider circuit 10 and is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded.
Specifically, the first resistor R1 and the second resistor R2 are connected in series to divide voltage, according to the principle of voltage division, the larger the ratio between the first resistor R1 and the second resistor R2 is, the larger the voltage divided by the first resistor R1 is, and the voltage inputted to the first input terminal of the comparison circuit 20 can be adjusted by adjusting the resistance values of the first resistor R1 and the second resistor R2.
In one embodiment, referring to fig. 2, the comparator circuit 20 includes a voltage comparator U1, a positive input of the voltage comparator U1 is a first input of the comparator circuit 20, a negative input of the voltage comparator U1 is a second input of the comparator circuit 20, and an output of the voltage comparator U1 is an output of the comparator circuit 20.
The characteristic of the voltage comparator U1 is that if the voltage at its positive input terminal is greater than the voltage at its negative input terminal, the voltage comparator U1 outputs a high level; if the voltage at the positive input terminal is less than the voltage at the negative input terminal, the voltage comparator U1 outputs a low level.
Specifically, the positive input terminal of the voltage comparator U1 receives a voltage signal output by the voltage divider circuit 10, for example, a 2V voltage signal, the negative input terminal of the voltage comparator U1 receives the first dimming signal output by the main chip 30, the positive power supply terminal of the voltage comparator U1 receives a digital voltage signal VDD, for example, a 3.3V digital voltage signal, and the negative power supply terminal of the voltage comparator U1 is grounded.
If the first dimming signal output by the main chip 30 is at a low level, for example, 0V, the value of the voltage signal at the positive input terminal of the voltage comparator U1 is greater than the value of the first dimming signal at the negative input terminal thereof, and the voltage comparator U1 outputs a high-level second dimming signal to the backlight module 40, for example, outputs a 3.3V second dimming signal to the backlight module 40. The value of the high-level second dimming signal output by the voltage comparator U1 is equal to the value of the digital voltage signal VDD received by the positive power supply terminal of the voltage comparator U1, for example, if the digital voltage signal VDD received by the positive power supply terminal of the voltage comparator U1 is 3.3V, the value of the high-level second dimming signal is also 3.3V.
If the first dimming signal outputted by the main chip 30 is at a high level, for example, 5V, the value of the voltage signal at the positive input terminal of the voltage comparator U1 is smaller than the value of the first dimming signal at the negative input terminal thereof, and the voltage comparator U1 outputs a low level second dimming signal to the backlight module 40, for example, outputs a 0V second dimming signal to the backlight module 40. Since the negative power terminal of the voltage comparator U1 is grounded, the value of the low-level second dimming signal output by the voltage comparator U1 is 0.
The comparison circuit 20 further includes a third resistor R3, a first end of the third resistor R3 is connected to the output terminal of the voltage comparator U1, and a second end of the third resistor R3 is grounded. The third resistor R3 is a pull-down resistor, and has a pull-down function when the second dimming signal output by the voltage comparator U1 is low.
In an embodiment, referring to fig. 2, the comparing circuit 20 further includes a first capacitor C1, one end of the first capacitor C1 is connected to the output terminal of the voltage comparator U1, and the other end of the first capacitor C1 is grounded.
The first capacitor C1 has a filtering function, and can improve the stability of the circuit.
The invention also provides a display device which comprises the direct current negative dimming circuit, the main chip and the backlight module.
Referring to fig. 1, the dc negative dimming circuit includes a voltage divider circuit 10 and a comparator circuit 20, an input terminal of the voltage divider circuit 10 receives an analog voltage signal, an output terminal of the voltage divider circuit 10 is connected to a first input terminal of the comparator circuit 20, a second input terminal of the comparator circuit 20 is connected to an output terminal of a main chip 30, and an output terminal of the comparator circuit 30 is connected to an input terminal of a backlight module.
In this embodiment, the input end of the voltage divider circuit 10 receives an analog voltage signal provided by an external circuit, such as a power supply, and the voltage divider circuit 10 divides the analog voltage signal and outputs the divided voltage signal to the first input end of the comparator circuit 20. The voltage signal output from the voltage divider circuit 10 to the comparator circuit 20 has a value smaller than the value of the high-level first dimming signal output from the main chip 30 through the circuit design of the voltage divider circuit 10, for example, if the high-level first dimming signal output from the main chip 30 is 5V, the value of the voltage signal output from the external circuit after voltage division by the voltage divider circuit 10 to the comparator circuit 20 is smaller than 5V, for example, may be 2V. A second input terminal of the comparison circuit 20 receives a first dimming signal output by the main chip 30, where the first dimming signal is a dimming signal in the form of a square wave. If the first dimming signal output by the main chip 30 is a low-level first dimming signal, for example, 0V, and the value of the low-level first dimming signal is smaller than the value of the voltage signal output by the voltage dividing circuit 10, for example, 2V, the comparing circuit 20 outputs a high-level second dimming signal to the backlight module 40, for example, outputs a 3.3V second dimming signal to the backlight module 40, so that the backlight module 40 is lit. If the first dimming signal output by the main chip 30 is a high-level first dimming signal, for example, 5V, and the value of the high-level first dimming signal is greater than the value of the voltage signal output by the voltage dividing circuit 10, the comparing circuit 20 outputs a low-level second dimming signal to the backlight module 40, for example, outputs a 0V second dimming signal to the backlight module 40, so as to dim the backlight module 40. Through the direct current negative dimming circuit, when the first dimming signal output by the main chip 30 is high, the second dimming signal input to the backlight module 40 is low, and the backlight module 40 is dark; when the first dimming signal output by the main chip 30 is low, the second dimming signal input to the backlight module 40 is high, and the backlight module 40 is bright.
In this embodiment, the display device may be a display device having a display panel, such as a television, a tablet computer, or a mobile phone.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A DC negative dimming circuit, comprising:
the input end of the voltage division circuit receives an analog voltage signal; the voltage division circuit is configured to divide the analog voltage signal and output the divided analog voltage signal;
a first input end of the comparison circuit is connected with the output end of the voltage division circuit, a second input end of the comparison circuit is connected with the output end of the main chip, and the output end of the comparison circuit is connected with the input end of the backlight module; the comparison circuit is configured to output a second dimming signal of a high level to the backlight module when the value of the voltage signal input by the first input terminal is greater than the value of the first dimming signal input by the second input terminal;
the comparison circuit is further configured to output a second dimming signal of a low level to the backlight module when the value of the voltage signal input by the first input terminal is smaller than the value of the first dimming signal input by the second input terminal;
the voltage signal input by the first input end is a constant voltage signal.
2. The dc negative dimming circuit of claim 1, wherein the voltage divider circuit comprises a first resistor and a second resistor, a first end of the first resistor is an input end of the voltage divider circuit, a second end of the first resistor is an output end of the voltage divider circuit and is connected to a first end of the second resistor, and a second end of the second resistor is connected to ground.
3. The dc negative dimming circuit of claim 2, wherein when the first dimming signal output by the main chip is at a high level, the value of the first dimming signal is greater than the value of the voltage signal output by the voltage dividing circuit.
4. The dc negative dimming circuit of claim 1, wherein the comparator circuit comprises a voltage comparator, a positive input of the voltage comparator is a first input of the comparator circuit, a negative input of the voltage comparator is a second input of the comparator circuit, and an output of the voltage comparator is an output of the comparator circuit.
5. The dc negative dimming circuit of claim 4, wherein the comparison circuit further comprises a third resistor, a first end of the third resistor is connected to the output terminal of the voltage comparator, and a second end of the third resistor is connected to ground.
6. The dc negative dimming circuit of claim 5, wherein the comparison circuit further comprises a first capacitor, one end of the first capacitor is connected to the output terminal of the voltage comparator, and the other end of the first capacitor is grounded.
7. The direct current negative dimming circuit of claim 6, wherein the positive power supply terminal of the voltage comparator receives a digital voltage signal, and the negative power supply terminal of the voltage comparator is grounded; the value of the high-level second dimming signal output by the voltage comparator is equal to the value of the digital voltage signal received by the positive power supply terminal of the voltage comparator, and the value of the low-level second dimming signal output by the voltage comparator is 0.
8. The utility model provides a direct current burden dimming circuit, is applied to display device which characterized in that, direct current burden dimming circuit includes:
the input end of the voltage division circuit receives an analog voltage signal; the voltage division circuit is configured to divide the analog voltage signal and output the divided analog voltage signal;
a first input end of the comparison circuit is connected with the output end of the voltage division circuit, a second input end of the comparison circuit is connected with the output end of the main chip, and the output end of the comparison circuit is connected with the input end of the backlight module; the comparison circuit is configured to output a second dimming signal of a high level to the backlight module when the value of the voltage signal input by the first input terminal is greater than the value of the first dimming signal input by the second input terminal; wherein a level of the first dimming signal is opposite to a level of the second dimming signal;
the comparison circuit is further configured to output a second dimming signal of a low level to the backlight module when the value of the voltage signal input by the first input terminal is smaller than the value of the first dimming signal input by the second input terminal;
the voltage signal input by the first input end is a constant voltage signal.
9. A display device, characterized in that the display device comprises a direct current negative dimming circuit according to any one of claims 1 to 8.
10. The display device according to claim 9, wherein the display device further comprises a main chip and a backlight module, an output terminal of the main chip is connected to the second input terminal of the comparison circuit of the dc negative dimming circuit, and an input terminal of the backlight module is connected to the output terminal of the comparison circuit of the dc negative dimming circuit.
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| CN108366448A (en) * | 2018-01-12 | 2018-08-03 | 深圳市崧盛电子股份有限公司 | One kind can just can negative logic LED light adjusting circuits and driving power |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101784151A (en) * | 2009-01-16 | 2010-07-21 | 国琏电子（上海）有限公司 | Light source driving device |
| CN203492241U (en) * | 2013-09-29 | 2014-03-19 | 郑州创亿达照明有限公司 | Novel LED dimming module |
| CN206210352U (en) * | 2016-10-28 | 2017-05-31 | 合肥惠科金扬科技有限公司 | A kind of PWM adjusting control circuits and display device |
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