Self-adaptive dimming circuit and display equipment

Abstract

The utility model provides a self-adaptive dimming circuit and a display device. The self-adaptive dimming circuit comprises a photosensitive module, a master control module and a dimming module. The light sensing module is connected with the main control module and is used for detecting the brightness of ambient light; the main control module is connected with the dimming module and is used for outputting a corresponding control signal to the dimming module according to the brightness of the ambient light; and the dimming module is connected with an LED circuit of the display equipment and is used for adjusting the magnitude of the output current according to the control signal so as to adjust the brightness of the LED circuit. According to the utility model, not only can the use experience be improved, but also myopia caused by long-time watching of an over-bright or over-dark display device by a user can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of display equipment, and in particular to an adaptive dimming circuit and a display equipment. Background Art

[0002] Display devices, such as display screens or televisions, are widely used as video playback devices in daily life. For example, televisions can provide various media resources for users to watch. However, when users watch television for a long time, since the brightness of the television is usually fixed, the ambient light will change over time. For example, the brightness of the indoor environment will decrease over time as the angle of the sun's rays changes. Or, when the user turns on the indoor lights, the indoor ambient light will also change to a large extent, and the ambient light will affect the display effect of the television. When the ambient light is strong, the screen of the television appears relatively dark, and the user needs to manually adjust the brightness of the television. When the ambient light is weak, the brightness of the television is prone to being too bright, and the user also needs to manually adjust the brightness of the television, which reduces the user's experience. At the same time, when the user forgets to adjust the brightness of the television, the screen of the television is in an overly bright or dark state for a long time, and the user is prone to visual fatigue, thereby reducing the user's vision. Utility Model Content

[0003] The utility model provides an adaptive dimming circuit and a display device, aiming to solve the problem that the brightness of a current television cannot be automatically adjusted, which reduces the user's experience and vision.

[0004] In a first aspect, the utility model provides an adaptive dimming circuit, which includes a photosensitive module, a main control module and a dimming module; the photosensitive module is connected to the main control module for detecting the brightness of ambient light; the main control module is connected to the dimming module for outputting a corresponding control signal to the dimming module according to the brightness of the ambient light; the dimming module is connected to the LED circuit of the display device for adjusting the output current according to the control signal to achieve brightness adjustment of the LED circuit.

[0005] Furthermore, the photosensitive module includes a photosensitive chip, and the photosensitive chip is connected to the main control module to detect the brightness of the ambient light.

[0006] Furthermore, the photosensitive module also includes a first resistor, a first capacitor, a second capacitor and a third capacitor; one end of the first resistor and one end of the first capacitor are both connected to the power supply, the other end of the first resistor is respectively connected to one end of the second capacitor, one end of the third capacitor and the photosensitive chip, and the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor are all grounded.

[0007] Furthermore, the photosensitive module also includes a second resistor, a third resistor and a fourth resistor; one end of the second resistor, one end of the third resistor and one end of the fourth resistor are all connected to the power supply, and the other end of the second resistor, the other end of the third resistor and the other end of the fourth resistor are all connected to the photosensitive chip.

[0008] Furthermore, the dimming module includes a dimming chip, a current detection circuit and a switch circuit; the dimming chip is connected to the current detection circuit, the switch circuit and the main control module respectively; and the switch circuit is also connected to the LED circuit.

[0009] Furthermore, the switch circuit includes a first switch tube, a controlled end and a first pole of the first switch tube are both connected to the dimming chip, and a second pole of the first switch tube is connected to the LED circuit.

[0010] Furthermore, the switching circuit also includes a fourth capacitor, a fifth resistor and a sixth resistor; one end of the fourth capacitor is connected to the LED circuit, the other end of the fourth capacitor is respectively connected to one end of the fifth resistor and one end of the sixth resistor, and the other end of the fifth resistor and the other end of the sixth resistor are both connected to the dimming chip.

[0011] Furthermore, the current detection circuit includes a plurality of resistors connected in parallel with each other.

[0012] Further, the plurality of resistors connected in parallel include a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor; one end of the seventh resistor, one end of the eighth resistor, one end of the ninth resistor, one end of the tenth resistor, one end of the eleventh resistor and one end of the twelfth resistor are all connected to the dimming chip, and the other end of the seventh resistor, the other end of the eighth resistor, the other end of the ninth resistor, the other end of the tenth resistor, the other end of the eleventh resistor and the other end of the twelfth resistor are all grounded.

[0013] In a second aspect, the utility model further provides a display device, which includes an LED circuit and any one of the above-mentioned adaptive dimming circuits.

[0014] The display device disclosed by the utility model includes an adaptive dimming circuit, which includes a photosensitive module, a main control module and a dimming module. The photosensitive module can detect the brightness of ambient light and send the detection result to the connected main control module. The main control module outputs a corresponding control signal to the dimming module according to the brightness of the ambient light. The dimming module adjusts the output current according to the control signal, thereby adjusting the brightness of the LED circuit, so that the brightness of the display device can be changed according to the change of the ambient light, thereby improving the user experience and preventing the user from myopia. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a block diagram of an adaptive dimming circuit provided by an embodiment of the utility model;

[0017] Figure 2 It is a circuit diagram of a photosensitive module of an adaptive dimming circuit provided by an embodiment of the utility model;

[0018] Figure 3 It is a circuit diagram of a dimming module of an adaptive dimming circuit provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, operations, elements, components and / or groups thereof.

[0021] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, the singular forms of "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the utility model specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0022] In addition, the directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings and the use status of the product. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0023] See also Figures 1 to 3 , Figure 1 1 is a block diagram of an adaptive dimming circuit 100 provided in one embodiment of the present utility model; Figure 2 1 is a circuit diagram of a photosensitive module 10 of an adaptive dimming circuit 100 provided in an embodiment of the present utility model; Figure 3 FIG. 1 is a circuit diagram of a dimming module 30 of an adaptive dimming circuit 100 provided in an embodiment of the present invention. Figure 1 As shown, the adaptive dimming circuit 100 includes a photosensitive module 10, a main control module 20 and a dimming module 30; the photosensitive module 10 is connected to the main control module 20 for detecting the brightness of the ambient light; the main control module 20 is connected to the dimming module 30 for outputting a corresponding control signal to the dimming module 30 according to the brightness of the ambient light; the dimming module 30 is connected to the LED circuit 200 of the display device for adjusting the output current according to the control signal to adjust the brightness of the LED circuit 200.

[0024] Specifically, the display device can be a device for playing media information such as a display screen or a television. When the display device is a display screen, the display screen can be connected to a corresponding smart device to play the content on the smart device. For example, the display screen can be connected to a computer host. Regardless of whether the display device is a display screen or a television, the brightness of most display devices is fixed at present, and the user needs to manually adjust the display brightness.

[0025] The adaptive dimming circuit 100 is arranged in a corresponding display device, and may include a photosensitive module 10, a main control module 20, and a dimming module 30. The photosensitive module 10 is used to detect the brightness of the ambient light. At the same time, the photosensitive module 10 is also connected to the main control module 20, and the detection result can be sent to the main control module 20. The main control module 20 can be a mainboard control system of the display device, and a corresponding algorithm is built in the main control module 20, which can output a corresponding control signal according to the brightness of the ambient light. For example, the average illumination of the ambient light can be matched with the duty cycle of the PWM signal one by one, and at the same time, the duty cycle of the PWM signal also corresponds to the screen brightness of the display device one by one, so that the corresponding PWM signal can be output according to the ambient light to control the screen brightness.

[0026] The dimming module 30 is connected to the main control module 20 and the LED circuit 200 respectively. On the one hand, the dimming module 30 receives a control signal from the main control module 20 , such as a PWM signal, and adjusts the output current according to the control signal, thereby adjusting the brightness of the LED circuit 200 .

[0027] In actual use, the photosensitive module 10 detects the brightness of the ambient light in real time. When the brightness of the ambient light increases, the main control module 20 increases the duty cycle of the PWM signal, so that the dimming module 30 increases the output current, thereby brightening the brightness of the LED circuit 200, and finally increasing the screen brightness of the display device. When the brightness of the ambient light decreases, the main control module 20 reduces the duty cycle of the PWM signal, so that the dimming module 30 reduces the output current, thereby dimming the brightness of the LED circuit 200, and finally reducing the screen brightness of the display device, thereby eliminating the need for the user to manually adjust the brightness, and preventing the user from watching a display device that is too bright or too dark for a long time, thereby preventing the user from myopia.

[0028] See also Figure 2As a further embodiment, the photosensitive module 10 includes a photosensitive chip U1, which is connected to the main control module 20 to detect the brightness of the ambient light. The photosensitive module 10 also includes a first resistor R1, a first capacitor C1, a second capacitor C2 and a third capacitor C3; one end of the first resistor R1 and one end of the first capacitor C1 are connected to the power supply, the other end of the first resistor R1 is respectively connected to one end of the second capacitor C2, one end of the third capacitor C3 and the photosensitive chip U1, and the other end of the first capacitor C1, the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded. The photosensitive module 10 also includes a second resistor R2, a third resistor R3 and a fourth resistor R4; one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 are connected to the power supply, and the other end of the second resistor R2, the other end of the third resistor R3 and the other end of the fourth resistor R4 are connected to the photosensitive chip U1.

[0029] The photosensitive module 10 may include a photosensitive chip U1, and the photosensitive chip U1 may be provided with a plurality of pins, such as Figure 2 As shown, the photosensitive chip U1 may be provided with a VDD pin, an SCL pin, a GND pin, an LDEA pin, an SDA pin, an INT pin, an LDR pin, and an LEDK pin, and the photosensitive chip U1 is connected to the serial bus through the SDA pin and the SCL pin, and is connected to the main control module 20 through the serial bus, and can perform data transmission with the main control module 20. The photosensitive chip U1 is mainly used to detect the brightness of the ambient light, and send the detection result to the main control module 20 through the corresponding pins.

[0030] The photosensitive circuit may also include a plurality of components for ensuring the stable operation of the photosensitive chip U1, namely, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2 and a third capacitor C3. The first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are all connected to the power supply, and the first resistor R1 is also respectively connected to the second capacitor C2, the third capacitor C3 and the VDD pin of the photosensitive chip U1. The second resistor R2 is connected to the SCL pin of the photosensitive chip U1, the third resistor R3 is connected to the SDA pin of the photosensitive chip U1, and the fourth resistor R4 is connected to the INT pin of the photosensitive chip U1. The first capacitor C1, the second capacitor C2 and the third capacitor C3 are all grounded.

[0031] See also Figure 3As a further embodiment, the dimming module 30 includes a dimming chip U2, a current detection circuit 31 and a switch circuit 32; the dimming chip U2 is respectively connected to the current detection circuit 31, the switch circuit 32 and the main control module 20; the switch circuit 32 is also connected to the LED circuit 200.

[0032] The dimming chip U2 may include a plurality of pins, such as a VIN pin, an LPWM pin, an HPWM pin, a FAULT pin, a GATE pin, a GND pin, a CS pin, and a ZVS pin, wherein the HPWM pin is used to connect to the main control module 20. It is understandable that Figure 3 Only the connection circuit of the right pin of the dimming chip U2 is shown, and the connection circuit on the left side of the dimming chip U2 can be a conventional circuit in the art and is not limited here.

[0033] The current detection circuit 31 is used to detect the current of the LED circuit 200 and output the detected current signal to the dimming chip U2. The dimming chip U2 has a built-in error amplifier. When the PWM signal sent by the main control module 20 is received, the reference of the error amplifier changes, so that the inductor current of the current detection circuit 31 can be adjusted. The error signal is then amplified and compared with the current signal detected by the current detection circuit 31, and the corresponding drive waveform is output through the GATE pin to control the conduction time of the switch circuit 32, thereby adjusting the output current.

[0034] As a further embodiment, the switch circuit 32 includes a first switch tube Q1, a controlled end and a first electrode of the first switch tube Q1 are both connected to the dimming chip U2, and a second electrode of the first switch tube Q1 is connected to the LED circuit 200. The switch circuit 32 also includes a fourth capacitor C4, a fifth resistor R5, and a sixth resistor R6; one end of the fourth capacitor C4 is connected to the LED circuit 200, the other end of the fourth capacitor C4 is respectively connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, and the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are both connected to the dimming chip U2.

[0035] The controlled end of the first switch tube Q1 is connected to the GATE pin of the dimming chip U2 and is controlled by the dimming chip U2. The dimming chip U2 can adjust the conduction time of the first switch tube Q1 to adjust the current of the LED circuit 200, thereby adjusting the brightness of the LED circuit 200.

[0036] The first switch tube Q1 can be a MOS tube, and the gate of the first switch tube Q1 is connected to the GATE pin of the dimming chip U2, the source of the first switch tube Q1 is connected to the CS pin of the dimming chip U2 and the current detection circuit 31, and the drain of the first switch tube Q1 is connected to the LED circuit 200.

[0037] The switch circuit 32 may further include a fifth resistor R5, a sixth resistor R6 and a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the LED circuit 200, the other end of the fourth capacitor C4 is respectively connected to the fifth resistor R5 and the sixth resistor R6, and the fifth resistor R5 and the sixth resistor R6 are also connected to the dimming chip U2.

[0038] As a further embodiment, the current detection circuit 31 includes a plurality of resistors connected in parallel. The plurality of resistors connected in parallel include a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12; one end of the seventh resistor R7, one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the tenth resistor R10, one end of the eleventh resistor R11 and one end of the twelfth resistor R12 are all connected to the dimming chip U2, and the other end of the seventh resistor R7, the other end of the eighth resistor R8, the other end of the ninth resistor R9, the other end of the tenth resistor R10, the other end of the eleventh resistor R11 and the other end of the twelfth resistor R12 are all grounded.

[0039] The seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 are connected between the CS pin and the ground terminal to detect the current of the LED circuit 200. The current detection circuit 31 inputs the detected current signal to the dimming chip U2, so that the dimming chip U2 can adjust the conduction time of the first switch tube Q1.

[0040] The utility model also provides a display device, which includes an LED circuit 200 and an adaptive dimming circuit 100 as described in any one of the above embodiments, wherein the adaptive dimming circuit 100 includes a photosensitive module 10, a main control module 20 and a dimming module 30; the photosensitive module 10 is connected to the main control module 20 for detecting the brightness of ambient light; the main control module 20 is connected to the dimming module 30 for outputting a corresponding control signal to the dimming module 30 according to the brightness of the ambient light; the dimming module 30 is connected to the LED circuit 200 of the display device for adjusting the output current according to the control signal to adjust the brightness of the LED circuit 200.

[0041] Specifically, the display device can be a device for playing media information such as a display screen or a television. When the display device is a display screen, the display screen can be connected to a corresponding smart device to play the content on the smart device. For example, the display screen can be connected to a computer host. Regardless of whether the display device is a display screen or a television, the brightness of most display devices is fixed at present, and the user needs to manually adjust the display brightness.

[0042] The adaptive dimming circuit 100 is arranged in a corresponding display device, and may include a photosensitive module 10, a main control module 20, and a dimming module 30. The photosensitive module 10 is used to detect the brightness of the ambient light. At the same time, the photosensitive module 10 is also connected to the main control module 20, and the detection result can be sent to the main control module 20. The main control module 20 can be a mainboard control system of the display device, and a corresponding algorithm is built in the main control module 20, which can output a corresponding control signal according to the brightness of the ambient light. For example, the average illumination of the ambient light can be matched with the duty cycle of the PWM signal one by one, and at the same time, the duty cycle of the PWM signal also corresponds to the screen brightness of the display device one by one, so that the corresponding PWM signal can be output according to the ambient light to control the screen brightness.

[0043] The dimming module 30 is connected to the main control module 20 and the LED circuit 200 respectively. On the one hand, the dimming module 30 receives a control signal from the main control module 20 , such as a PWM signal, and adjusts the output current according to the control signal, thereby adjusting the brightness of the LED circuit 200 .

[0044] In actual use, the photosensitive module 10 detects the brightness of the ambient light in real time. When the brightness of the ambient light increases, the main control module 20 increases the duty cycle of the PWM signal, so that the dimming module 30 increases the output current, thereby brightening the brightness of the LED circuit 200, and finally increasing the screen brightness of the display device. When the brightness of the ambient light decreases, the main control module 20 reduces the duty cycle of the PWM signal, so that the dimming module 30 reduces the output current, thereby dimming the brightness of the LED circuit 200, and finally reducing the screen brightness of the display device, thereby eliminating the need for the user to manually adjust the brightness, and preventing the user from watching a display device that is too bright or too dark for a long time, thereby preventing the user from myopia.

[0045] The utility model discloses an adaptive dimming circuit and a display device. The photosensitive module can detect the intensity of ambient light. The main control module can output a corresponding control signal according to the intensity of the ambient light to control the dimming circuit to adjust the output current, thereby adjusting the brightness of the display device, improving the user experience and avoiding myopia of the user.

[0046] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An adaptive dimming circuit, characterized in that: Applied to display devices, including photosensitive modules, main control modules and dimming modules; The photosensitive module is connected to the main control module and is used to detect the brightness of ambient light; The main control module is connected to the dimming module and is used to output a corresponding control signal to the dimming module according to the brightness of the ambient light; The dimming module is connected to the LED circuit of the display device and is used to adjust the magnitude of the output current according to the control signal to adjust the brightness of the LED circuit.

2. The adaptive dimming circuit according to claim 1, characterized in that: The photosensitive module includes a photosensitive chip, which is connected to the main control module to detect the brightness of the ambient light.

3. The adaptive dimming circuit according to claim 2, characterized in that: The photosensitive module also includes a first resistor, a first capacitor, a second capacitor and a third capacitor; One end of the first resistor and one end of the first capacitor are both connected to the power supply, the other end of the first resistor is respectively connected to one end of the second capacitor, one end of the third capacitor and the photosensitive chip, and the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor are all grounded.

4. The adaptive dimming circuit according to claim 3, characterized in that: The photosensitive module also includes a second resistor, a third resistor and a fourth resistor; One end of the second resistor, one end of the third resistor and one end of the fourth resistor are all connected to the power supply, and the other end of the second resistor, the other end of the third resistor and the other end of the fourth resistor are all connected to the photosensitive chip.

5. The adaptive dimming circuit according to claim 1, characterized in that: The dimming module includes a dimming chip, a current detection circuit and a switch circuit; The dimming chip is respectively connected to the current detection circuit, the switch circuit and the main control module; The switch circuit is also connected to the LED circuit.

6. The adaptive dimming circuit according to claim 5, characterized in that: The switch circuit includes a first switch tube, a controlled end and a first pole of the first switch tube are both connected to the dimming chip, and a second pole of the first switch tube is connected to the LED circuit.

7. The adaptive dimming circuit according to claim 6, characterized in that: The switch circuit further includes a fourth capacitor, a fifth resistor and a sixth resistor; One end of the fourth capacitor is connected to the LED circuit, the other end of the fourth capacitor is respectively connected to one end of the fifth resistor and one end of the sixth resistor, and the other end of the fifth resistor and the other end of the sixth resistor are both connected to the dimming chip.

8. The adaptive dimming circuit according to claim 6, characterized in that: The current detection circuit includes a plurality of resistors connected in parallel with each other.

9. The adaptive dimming circuit according to claim 8, characterized in that: The plurality of resistors connected in parallel to each other include a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor; One end of the seventh resistor, one end of the eighth resistor, one end of the ninth resistor, one end of the tenth resistor, one end of the eleventh resistor and one end of the twelfth resistor are all connected to the dimming chip, and the other end of the seventh resistor, the other end of the eighth resistor, the other end of the ninth resistor, the other end of the tenth resistor, the other end of the eleventh resistor and the other end of the twelfth resistor are all grounded.

10. A display device, characterized in that: The invention comprises an LED circuit and an adaptive dimming circuit as claimed in any one of claims 1 to 9.

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