CN117558234B - Wide-viewing angle LED display screen - Google Patents
Wide-viewing angle LED display screen Download PDFInfo
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- CN117558234B CN117558234B CN202311751446.3A CN202311751446A CN117558234B CN 117558234 B CN117558234 B CN 117558234B CN 202311751446 A CN202311751446 A CN 202311751446A CN 117558234 B CN117558234 B CN 117558234B
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- 238000005070 sampling Methods 0.000 claims description 50
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- 238000004891 communication Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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Abstract
The application particularly relates to a wide-view angle LED display screen, which comprises a comparator circuit, a first adjusting switch, a second adjusting switch, an LED control mos tube group and an LED group circuit, wherein the first adjusting switch is electrically connected with a first input end of the comparator circuit, an LED control mos tube group control end and a reference voltage circuit, the first adjusting switch is used for controlling the first input end of the comparator circuit to be electrically connected with the reference voltage circuit or the LED control mos tube group control end to be electrically connected with the reference voltage circuit.
Description
Technical Field
The invention belongs to the field of LED display screen control, and particularly relates to a wide-viewing angle LED display screen.
Background
In the prior art, the backlight driving of the led display screen generally controls the electronic switch MOS tube through the duty ratio signal to realize the power driving and adjustment of the backlight; there is also a kind of technology, in which an electronic switch is controlled by a one-way duty ratio signal and constant current control is added, the duty ratio is no matter in low level or high level, the MOS tube is in an on state, the current flowing through the light bar is always direct current, no switch alternation exists, the direct current dimming is realized, and the control of the current ensures that the Led light bar is always direct current or even constant current. Thus, although the wide-view angle LED display screen can be ensured through direct current and even constant current, the technology also has a great problem, and the problem is mainly that the technology completely loses the advantage of duty ratio control and cannot realize the purpose of duty ratio adjustment. In general, the reason why the backlight uses the duty ratio instead of direct current is that accurate control of the voltage, and thus accurate adjustment of the backlight brightness, can be achieved by adjusting the duty ratio. This adjustment is not only technically feasible but has many advantages in practical applications. First, a smooth regulation of the voltage can be achieved using the duty cycle. When the backlight brightness needs to be increased or decreased, the method can be realized by changing the duty ratio of the pulse signal without directly adjusting the voltage value of the direct current. In this way flickering and discomfort caused by abrupt voltage changes can be avoided. Second, energy can be saved using a duty cycle. Since the adjustment range of the backlight brightness is usually 20-100%, in the case of using the duty ratio, the entire voltage is applied to the backlight only when the high brightness is required, and only a part of the voltage is applied to the backlight when the low brightness is required, thereby saving energy consumption.
Furthermore, the use of a duty cycle may also improve the reliability of the device. Since the duty ratio is realized by controlling the pulse signal, the problems of overcurrent or overvoltage, etc. which may be caused by directly using the direct current can be avoided. The control mode can be conveniently integrated with advanced control systems such as a Digital Signal Processor (DSP) and the like, and more accurate backlight brightness control is realized.
However, although the prior art can ensure a wide-view angle LED display screen, the prior art completely loses the advantages of the duty ratio control, cannot realize the purpose of duty ratio adjustment, and cannot have both the purposes.
Disclosure of Invention
The invention aims to provide a wide-viewing angle LED display screen so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
The LED display screen with the wide viewing angle comprises a comparator circuit, a first adjusting switch, a second adjusting switch, an LED control mos tube group and an LED group circuit, wherein the first adjusting switch is electrically connected with a first input end of the comparator circuit, an LED control mos tube group control end and a reference voltage circuit; the two non-control ends of the auxiliary control mos tube are connected in series between the first adjusting switch and the LED control mos tube group control end, the auxiliary control mos tube is electrically connected with the output end of the auxiliary control circuit, the output end of the auxiliary control circuit is used for controlling the communication state of the auxiliary control mos tube, and the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube.
Further, the auxiliary control circuit is electrically connected with the brightness sampling circuit, the brightness sampling circuit is used for detecting brightness of each area of the display screen, uniformity parameters of backlight are sent to the auxiliary control circuit, the auxiliary control circuit selectively controls conduction of the auxiliary control mos tube based on the uniformity parameters of the backlight, the auxiliary control mos tube is controlled to be not conducted when the uniformity parameters of the backlight exceed a threshold value, and the auxiliary control mos tube is controlled to be conducted when the uniformity parameters of the backlight do not exceed the threshold value.
Further, the brightness sampling circuit in the LED display screen comprises an analog voltage sampling circuit, a digital brightness sensor and a matrix type brightness sampling circuit.
Further, the auxiliary control circuit is electrically connected with the chroma sampling circuit, the chroma sampling circuit is used for detecting the color of each area of the display screen, the uniformity parameter of the backlight is sent to the auxiliary control circuit, the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, when the uniformity parameter of the backlight exceeds a threshold value, the auxiliary control mos tube is controlled to be non-conductive by the auxiliary control circuit, and when the uniformity parameter of the backlight does not exceed the threshold value, the auxiliary control mos tube is controlled to be conductive by the auxiliary control circuit.
Further, the chroma sampling circuit in the LED display screen comprises an RGB chroma sampling circuit, a color filter array circuit and a color converter.
Further, the auxiliary control circuit is electrically connected with the current sampling circuit, the current sampling circuit is used for detecting the current of each area of the display screen and sending the uniformity parameter of the backlight to the auxiliary control circuit, the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, when the uniformity parameter of the backlight exceeds a threshold value, the auxiliary control mos tube is controlled to be non-conductive by the auxiliary control circuit, and when the uniformity parameter of the backlight does not exceed the threshold value, the auxiliary control mos tube is controlled to be conductive by the auxiliary control circuit.
Further, the application method of the wide-view LED display screen comprises the following steps: the method comprises the steps of, in a continuous direct current power supply state: the comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit, the reference voltage circuit drives the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit is high in voltage to drive the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, and the LED group circuit is in a continuous direct current power supply state;
Further, in the non-continuous dc power supply state: the comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit selectively, the reference voltage circuit selectively drives the LED control mos tube group, the LED control mos tube group selectively drives the LED group circuit to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit drives the LED control mos tube group at high voltage, the LED control mos tube group drives the LED group circuit to be conducted, and the LED group circuit is in a discontinuous direct current power supply state.
The beneficial effects are that: according to the application, the circuit can be configured into a continuous direct current power supply state or a discontinuous direct current power supply state, the wide view angle of the LED display screen can be ensured in the continuous direct current power supply state, and the LED control mos tube group selectively drives the LED group circuit to be conducted in the discontinuous direct current power supply state, so that the wide view angle of the LED display screen can be ensured, the effectiveness of a duty ratio signal can be reserved, and the LED display screen can be comprehensively and intelligently controlled.
Drawings
Fig. 1 is a schematic circuit diagram of a wide viewing angle LED display of the present application.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The application discloses a wide-view angle LED display screen, as shown in figure 1, which comprises a comparator circuit, a first adjusting switch, a second adjusting switch, an LED control mos tube group and an LED group circuit, wherein the first adjusting switch is electrically connected with a first input end of the comparator circuit, an LED control mos tube group control end and a reference voltage circuit; the two non-control ends of the auxiliary control mos tube are connected in series between the first adjusting switch and the LED control mos tube group control end, the auxiliary control mos tube is electrically connected with the output end of the auxiliary control circuit, the output end of the auxiliary control circuit is used for controlling the communication state of the auxiliary control mos tube, and the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube; the auxiliary control circuit is further electrically connected with the brightness sampling circuit, the brightness sampling circuit is used for detecting brightness of each area of the display screen, the uniformity parameter of the backlight is sent to the auxiliary control circuit (the uniformity parameter of the backlight can be directly standard deviation of a brightness sample quantization value of each area of the detection display screen), the auxiliary control circuit selectively controls conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, when the uniformity parameter of the backlight exceeds a threshold value (uniformity of the backlight is enough), the auxiliary control circuit controls non-conduction of the auxiliary control mos tube, when the uniformity parameter of the backlight does not exceed the threshold value (uniformity of the backlight is insufficient), the auxiliary control circuit controls conduction of the auxiliary control mos tube, and the brightness sampling circuit in the LED display screen comprises the following circuits:
1. Analog voltage sampling: according to the method, the brightness of the LED display screen is converted into an analog voltage signal, then a voltage follower or an amplifier is used for buffering and amplifying the signal, and finally the sampling voltage is sent into a processing circuit for detection and adjustment.
2. Digital luminance sensor: a digital luminance sensor is a sensor capable of directly converting the luminance of an LED display screen into a digital signal, such as an AD converter. The method can more accurately measure brightness and can be more easily used with digital signal processing circuitry.
3. Matrix type brightness sampling: according to the method, the brightness sensor is arranged below each pixel point of the LED display screen, so that the brightness of the whole screen is sampled. Matrix luminance sampling can more accurately measure the luminance of each pixel point and can be used to implement High Dynamic Range (HDR) display techniques. These circuit forms may be selected according to the specific requirements and design of the LED display screen.
Or the auxiliary control circuit is also electrically connected with the chroma sampling circuit, the chroma sampling circuit is used for detecting the color of each area of the display screen, the uniformity parameter of the backlight is sent to the auxiliary control circuit (the uniformity parameter of the backlight can be directly the standard deviation of the color sample quantized value of each area of the detection display screen), the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, when the uniformity parameter of the backlight exceeds a threshold value (the uniformity of the backlight is enough), the auxiliary control circuit controls the auxiliary control mos tube to be not conducted, when the uniformity parameter of the backlight does not exceed the threshold value (the uniformity of the backlight is insufficient), the auxiliary control circuit controls the auxiliary control mos tube to be conducted, and the chroma sampling circuit in the LED display screen comprises the following circuit forms:
Rgb chroma sampling: according to the method, the RGB chromaticity sensor is arranged below each pixel point of the LED display screen, and the color of each pixel point is sampled. RGB chroma sampling can accurately measure the color of each pixel point and can be used to implement High Dynamic Range (HDR) display technologies.
2. Color Filter Array (CFA): according to the method, a color filter is arranged below each pixel point of the LED display screen, and the color of each pixel point is sampled. CFA can sample the color of the entire screen, but requires processing the sampled results using a color correction algorithm to obtain more accurate color measurements.
3. Color converter: the method comprises the steps of converting a brightness signal of an LED display screen into a chrominance signal, and then sampling the chrominance signal by using a chrominance sampling circuit. The color converter may be a device based on optical or electrical principles, such as a color encoder or a color decoder, etc. These circuit forms may be selected according to the specific requirements and design of the LED display screen.
Or the auxiliary control circuit is electrically connected with the current sampling circuit, the current sampling circuit is used for detecting the current magnitude of each area of the display screen and sending the uniformity parameter of the backlight to the auxiliary control circuit (the uniformity parameter of the backlight can be directly the standard deviation of the sample current magnitude of each area of the display screen), the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, when the uniformity parameter of the backlight exceeds a threshold value (the uniformity of the backlight is enough), the auxiliary control circuit controls the auxiliary control mos tube to be not conducted, and when the uniformity parameter of the backlight does not exceed the threshold value (the uniformity of the backlight is insufficient), the auxiliary control circuit controls the auxiliary control mos tube to be conducted, and the current sampling circuit is quite common in the prior art and not repeated.
The application is in a continuous direct current power supply state:
The comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit, the reference voltage circuit drives the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit is high in voltage, the LED control mos tube group drives the LED group to be conducted, and the LED group circuit is in a continuous direct current power supply state.
In the non-continuous dc power supply state:
The comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit selectively, the reference voltage circuit selectively drives the LED control mos tube group, the LED control mos tube group selectively drives the LED group circuit to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit drives the LED control mos tube group at high voltage, the LED control mos tube group drives the LED group circuit to be conducted, and the LED group circuit is in a discontinuous direct current power supply state.
Therefore, the circuit can be configured into a continuous direct current power supply state or a discontinuous direct current power supply state, the wide view angle of the LED display screen can be ensured in the continuous direct current power supply state, and the LED control mos tube group in the discontinuous direct current power supply state selectively drives the LED group circuit to be conducted, so that the wide view angle of the LED display screen can be ensured, the effectiveness of duty ratio signals can be reserved, and the LED display screen can be comprehensively and intelligently controlled.
Embodiments of the application that require protection include:
The wide-view angle LED display screen comprises a comparator circuit, a first adjusting switch, a second adjusting switch, an LED control mos tube group and an LED group circuit, wherein the first adjusting switch is electrically connected with a first input end of the comparator circuit, an LED control mos tube group control end and a reference voltage circuit,
The first regulating switch is used for controlling the first input end of the comparator circuit to be electrically connected with the reference voltage circuit or the control end of the LED control mos tube group to be electrically connected with the reference voltage circuit, the second input end of the comparator circuit to be electrically connected with the duty ratio input circuit, the output end of the comparator circuit to be electrically connected with the control end of the LED control mos tube group after being connected with the second regulating switch in series,
The second regulating switch is used for controlling the output end of the comparator circuit to be connected with the control end of the LED control mos tube group or the output end of the comparator circuit to be grounded, the LED control mos tube group is electrically connected with the LED group circuit, and the LED control mos tube group controls the communication state of the LED group circuit; the two non-control ends of the auxiliary control mos tube are connected in series between the first adjusting switch and the LED control mos tube group control end, the auxiliary control mos tube is electrically connected with the output end of the auxiliary control circuit, the output end of the auxiliary control circuit is used for controlling the communication state of the auxiliary control mos tube, and the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube.
Preferably, the auxiliary control circuit is further electrically connected with a brightness sampling circuit, the brightness sampling circuit is used for detecting brightness of each area of the display screen, the uniformity parameter of the backlight is sent to the auxiliary control circuit, the auxiliary control circuit selectively controls conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, the auxiliary control mos tube is controlled to be non-conductive when the uniformity parameter of the backlight exceeds a threshold value, and the auxiliary control mos tube is controlled to be conductive when the uniformity parameter of the backlight does not exceed the threshold value. The brightness sampling circuit in the LED display screen comprises an analog voltage sampling circuit, a digital brightness sensor and a matrix type brightness sampling circuit.
Or preferably, the auxiliary control circuit is further electrically connected with the chroma sampling circuit, the chroma sampling circuit is used for detecting the color of each area of the display screen, the uniformity parameter of the backlight is sent to the auxiliary control circuit, the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, the auxiliary control mos tube is controlled to be not conducted when the uniformity parameter of the backlight exceeds a threshold value, and the auxiliary control mos tube is controlled to be conducted when the uniformity parameter of the backlight does not exceed the threshold value. The chroma sampling circuit in the LED display screen comprises an RGB chroma sampling circuit, a color filter array circuit and a color converter.
Or preferably, the auxiliary control circuit is further electrically connected with the current sampling circuit, the current sampling circuit is used for detecting the current of each area of the display screen and sending the uniformity parameter of the backlight to the auxiliary control circuit, the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube based on the uniformity parameter of the backlight, the auxiliary control mos tube is controlled to be not conducted when the uniformity parameter of the backlight exceeds a threshold value, and the auxiliary control mos tube is controlled to be conducted when the uniformity parameter of the backlight does not exceed the threshold value.
The application method of the wide-view LED display screen comprises the following steps of, in a continuous direct current power supply state: the comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit, the reference voltage circuit drives the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit is high in voltage to drive the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, and the LED group circuit is in a continuous direct current power supply state;
In the non-continuous dc power supply state: the comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit selectively, the reference voltage circuit selectively drives the LED control mos tube group, the LED control mos tube group selectively drives the LED group circuit to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit drives the LED control mos tube group at high voltage, the LED control mos tube group drives the LED group circuit to be conducted, and the LED group circuit is in a discontinuous direct current power supply state.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. The above disclosed embodiments are illustrative in all respects only and not all changes that come within the scope of the invention or are equivalent to the invention are intended to be embraced therein.
Claims (7)
1. The LED display screen with the wide viewing angle is characterized by comprising a comparator circuit, a first adjusting switch, a second adjusting switch, an LED control mos tube group and an LED group circuit, wherein the first adjusting switch is electrically connected with a first input end of the comparator circuit, an LED control mos tube group control end and a reference voltage circuit; the two non-control ends of the auxiliary control mos tube are connected in series between the first adjusting switch and the LED control mos tube group control end, the auxiliary control mos tube is electrically connected with the output end of the auxiliary control circuit, the output end of the auxiliary control circuit is used for controlling the communication state of the auxiliary control mos tube, and the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube.
2. The wide-viewing angle LED display of claim 1, wherein the auxiliary control circuit is further electrically connected to a brightness sampling circuit, the brightness sampling circuit is configured to detect brightness of each region of the display, send a uniformity parameter of the backlight to the auxiliary control circuit, and the auxiliary control circuit selectively controls conduction of the auxiliary control mos transistor based on the uniformity parameter of the backlight, and when the uniformity parameter of the backlight exceeds a threshold, the auxiliary control circuit controls non-conduction of the auxiliary control mos transistor, and when the uniformity parameter of the backlight does not exceed the threshold, the auxiliary control circuit controls conduction of the auxiliary control mos transistor.
3. The wide-view LED display screen of claim 2, wherein the luminance sampling circuit in the LED display screen comprises an analog voltage sampling circuit or a digital luminance sensor or a matrix luminance sampling circuit.
4. The wide-viewing angle LED display of claim 1, wherein the auxiliary control circuit is further electrically connected to the chroma sampling circuit, the chroma sampling circuit is configured to detect a color of each region of the display, send a uniformity parameter of the backlight to the auxiliary control circuit, and the auxiliary control circuit selectively controls conduction of the auxiliary control mos transistor based on the uniformity parameter of the backlight, and when the uniformity parameter of the backlight exceeds a threshold, the auxiliary control circuit controls non-conduction of the auxiliary control mos transistor, and when the uniformity parameter of the backlight does not exceed the threshold, the auxiliary control circuit controls conduction of the auxiliary control mos transistor.
5. The wide-view LED display of claim 4, wherein the chroma sampling circuits in the LED display comprise RGB chroma sampling circuits or color filter array circuits or color converters.
6. The wide-viewing angle LED display of claim 1, wherein the auxiliary control circuit is further electrically connected to the current sampling circuit, the current sampling circuit is configured to detect a magnitude of a current in each region of the display screen, send a uniformity parameter of the backlight to the auxiliary control circuit, and the auxiliary control circuit selectively controls conduction of the auxiliary control mos transistor based on the uniformity parameter of the backlight, and when the uniformity parameter of the backlight exceeds a threshold, the auxiliary control circuit controls non-conduction of the auxiliary control mos transistor, and when the uniformity parameter of the backlight does not exceed the threshold, the auxiliary control mos transistor is controlled to conduct.
7. The method for using a wide viewing angle LED display of claim 1, comprising the step of, in a continuous dc power state: the comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit, the reference voltage circuit drives the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit is high in voltage to drive the LED control mos tube group, the LED control mos tube group drives the LED group to be conducted, and the LED group circuit is in a continuous direct current power supply state;
In the non-continuous dc power supply state: the comparator circuit does not work when the duty ratio input circuit is low in voltage, the output end of the auxiliary control circuit selectively controls the conduction of the auxiliary control mos tube, the first adjusting switch controls the LED control mos tube group to be electrically connected with the reference voltage circuit selectively, the reference voltage circuit selectively drives the LED control mos tube group, the LED control mos tube group selectively drives the LED group circuit to be conducted, the comparator circuit works when the duty ratio input circuit is high in voltage, the first input end of the first adjusting switch control comparator circuit is electrically connected with the reference voltage circuit, the output end of the second adjusting switch control comparator circuit is electrically connected with the LED control mos tube group control end, the duty ratio input circuit drives the LED control mos tube group at high voltage, the LED control mos tube group drives the LED group circuit to be conducted, and the LED group circuit is in a discontinuous direct current power supply state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311751446.3A CN117558234B (en) | 2023-12-19 | Wide-viewing angle LED display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311751446.3A CN117558234B (en) | 2023-12-19 | Wide-viewing angle LED display screen |
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| Publication Number | Publication Date |
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| CN117558234A CN117558234A (en) | 2024-02-13 |
| CN117558234B true CN117558234B (en) | 2024-06-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113632364A (en) * | 2019-11-22 | 2021-11-09 | 东芝三菱电机产业系统株式会社 | Power conversion unit |
| CN116935803A (en) * | 2022-04-08 | 2023-10-24 | 北京字跳网络技术有限公司 | Backlight brightness adjusting circuit, control method and equipment thereof |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113632364A (en) * | 2019-11-22 | 2021-11-09 | 东芝三菱电机产业系统株式会社 | Power conversion unit |
| CN116935803A (en) * | 2022-04-08 | 2023-10-24 | 北京字跳网络技术有限公司 | Backlight brightness adjusting circuit, control method and equipment thereof |
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