Backlight dimming circuit and display device

Abstract

The application relates to a backlight dimming circuit and a display device. The backlight dimming circuit comprises a touch sensor, a photosensitive module arranged on the touch sensor and used for sensing ambient light illumination of an environment where a backlight module is located, and a touch control module connected with the photosensitive module and used for acquiring the number of photoelectron changes of the photosensitive module when the intensity of the ambient light changes and adjusting the brightness of the backlight module based on the number of photoelectron changes. The photosensitive module arranged on the touch sensor is used for sensing the ambient light illumination of the environment where the backlight module is located. When the intensity of the ambient light changes, the number of photoelectrons of the photosensitive module also changes. The touch control module is used for acquiring the number of photoelectron changes of the photosensitive module when the intensity of the ambient light changes, and adjusting the brightness of the backlight module based on the number of photoelectron changes, so that the brightness of the backlight module is automatically adjusted, and energy consumption is reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a backlight dimming circuit and display device. Background Technology

[0002] With the development of display technology, sustainable development (especially in terms of energy conservation and consumption reduction in display products) has received widespread attention in the application of display technology.

[0003] The most power-consuming part of conventional display products is the backlight unit. The brightness of the backlight unit remains unchanged under different lighting conditions. Therefore, in application scenarios where a high-brightness backlight unit is not required, a high-brightness backlight unit will increase power consumption and cause energy waste. Summary of the Invention

[0004] Therefore, it is necessary to provide a backlight dimming circuit and a display device to address the above problems.

[0005] To address the aforementioned problems, this application provides a backlight dimming circuit, comprising:

[0006] Touch sensor;

[0007] A photosensitive module is disposed on the touch sensor and is used to sense the ambient light of the environment in which the backlight module is located.

[0008] A touch module, connected to the photosensitive module, is used to acquire the number of photoelectron changes in the photosensitive module when the intensity of ambient light changes, and to adjust the brightness of the backlight module based on the number of photoelectron changes.

[0009] In the backlight dimming circuit of this application, an ambient light source is sensed by a photosensitive module mounted on a touch sensor. When the intensity of the ambient light changes, the number of photoelectrons in the photosensitive module also changes. The touch module is connected to the photosensitive module and obtains the number of photoelectrons changing when the intensity of the ambient light changes. Based on the number of photoelectrons changing, the brightness of the backlight module is adjusted to achieve automatic adjustment of the backlight module's brightness, enabling the backlight module to adapt to applications in different environments and saving energy.

[0010] In one embodiment, the photosensitive module includes:

[0011] A photoresistor, the first end of which is connected to the touch module;

[0012] A capacitor, wherein the first end of the capacitor is connected to the second end of the photoresistor, and the second end of the capacitor is grounded.

[0013] In one embodiment, the touch module includes:

[0014] A touch unit, connected to the photosensitive module, is used to acquire the number of photoelectron changes in the photosensitive module when the intensity of ambient light changes;

[0015] A control unit is used to adjust the brightness of the backlight module based on the amount of photoelectron changes.

[0016] In one embodiment, the touch unit includes:

[0017] A comparator, the input of which is connected to the first end of the photoresistor, is used to obtain the number of photoelectron changes of the photosensitive module when the intensity of ambient light changes;

[0018] A single-pole double-throw switch is provided, wherein the moving end of the single-pole double-throw switch is connected to the second end of the capacitor, the first stationary end of the single-pole double-throw switch is connected to the first end of the photoresistor and the input end of the comparator respectively, and the second stationary end of the single-pole double-throw switch is connected to the output end of the comparator, for controlling the on / off state of the touch unit.

[0019] In one embodiment, the control unit includes:

[0020] A pulse width modulator, wherein the input terminal of the pulse width modulator is connected to the output terminal of the comparator and the second stationary terminal of the single-pole double-throw switch respectively, and is used to adjust the brightness of the backlight module;

[0021] A clock signaler, connected to the output of the pulse width modulator, is used to control the comparator to acquire the number of photoelectron changes of the photosensitive module when the light intensity changes at preset intervals.

[0022] In one embodiment, the photosensitive module is disposed on the touch-sensing surface of the touch sensor.

[0023] Secondly, this application also provides a display device, comprising:

[0024] Backlight module;

[0025] A power drive circuit, connected to the backlight module, is used to drive the backlight module to work;

[0026] The backlight dimming circuit described in any of the above embodiments is connected to the power drive circuit and is used to adjust the brightness of the backlight module.

[0027] The display device of this application includes a backlight dimming circuit. The backlight module is connected to the backlight dimming circuit via a power drive circuit. An ambient light source is sensed by a photosensitive module mounted on a touch sensor. When the intensity of the ambient light changes, the number of photoelectrons in the photosensitive module also changes. A touch module is connected to the photosensitive module and obtains the number of photoelectron changes in the photosensitive module when the intensity of the ambient light changes. Based on the number of photoelectron changes, the brightness of the backlight module is adjusted to achieve automatic adjustment of the backlight module's brightness. This allows the display device of this application to adapt to applications in different environments, saving energy and reducing consumption.

[0028] In one embodiment, the display device further includes:

[0029] An optical anti-reflective coating is located on the side of the photosensitive module away from the touch sensor;

[0030] The cover plate is located on the side of the optical antireflective film away from the photosensitive module.

[0031] In one embodiment, the display device further includes:

[0032] An ink layer is located between the cover plate and the optical antireflective film. The ink layer has a window, and the photosensitive module is at least partially exposed through the window.

[0033] In one embodiment, the photosensitive module includes:

[0034] The conductive strips are arranged at intervals and are located on the touch sensing surface of the touch sensor;

[0035] A photosensitive structure is located on the touch-sensing surface of the touch sensor and between adjacent conductive strips.

[0036] In one embodiment, the photosensitive module includes:

[0037] A printed circuit board is located on the touch-sensing surface of the touch sensor;

[0038] The conductive strips are spaced apart and located on the side of the printed circuit board away from the touch-sensing surface;

[0039] A photosensitive structure is located on the side of the printed circuit board away from the touch-sensing surface and between adjacent conductive strips.

[0040] In one embodiment, the touch sensing surface of the touch sensor includes a touch area and a non-touch area; the number of photosensitive modules is multiple, and the multiple photosensitive modules are spaced apart in the non-touch area. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the backlight dimming circuit provided in one embodiment;

[0043] Figure 2 This is a schematic diagram of the equivalent circuit of the photosensitive module and the touch module provided in one embodiment;

[0044] Figure 3 This embodiment illustrates the variation in the number of photoelectrons under different light intensities.

[0045] Figure 4 This is a top view of the photosensitive module and touch sensor provided in one embodiment;

[0046] Figure 5 This is a schematic cross-sectional view of the photosensitive module and touch sensor provided in one embodiment;

[0047] Figure 6 This is a schematic diagram of the structure of a display device provided in one embodiment;

[0048] Figure 7 This is a partial cross-sectional structural diagram of a display device provided in one embodiment.

[0049] Explanation of reference numerals in the attached figures:

[0050] 10-Backlight dimming circuit; 1-Touch sensor; 11-Touch area; 12-Non-touch area; 2-Photosensitive module; 21-Conductive strip; 22-Photosensitive structure; 3-Touch module; 31-Touch unit; 32-Control unit; 100-Display device; 20-Power drive circuit; 30-Backlight module; 40-Optical anti-reflective film; 50-Ink layer; 60-Cover plate. Detailed Implementation

[0051] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this application more thorough and complete.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0053] It should be understood that when a component or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" other components or layers, it may be directly on, adjacent to, connected to, or coupled to other components or layers, or there may be intervening components or layers. Conversely, when a component is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other components or layers, there are no intervening components or layers.

[0054] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0055] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms “comprise” and / or “comprising” are used in this specification, the presence of the stated feature, integer, step, operation, element, and / or part is established, but the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups is not excluded. Meanwhile, when used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0056] With the development of display technology, sustainable development (especially in terms of energy conservation and consumption reduction in display products) has received widespread attention in the application of display technology.

[0057] The most power-consuming part of conventional display products is the backlight unit. The brightness of the backlight unit remains unchanged under different lighting conditions. Therefore, in application scenarios where a high-brightness backlight unit is not required, a high-brightness backlight unit will increase power consumption and cause energy waste.

[0058] Therefore, it is necessary to provide a backlight dimming circuit and a display device to address the above problems.

[0059] To solve the above problems, such as Figure 1 As shown, a backlight dimming circuit 10 is provided. The backlight dimming circuit 10 includes: a touch sensor 1, a photosensitive module 2, and a touch control module 3. The photosensitive module 2 is disposed on the touch sensor 1 and is used to sense the ambient light of the environment in which the backlight module is located. The touch control module 3 is connected to the photosensitive module 2 and is used to obtain the number of photoelectron changes of the photosensitive module 2 when the intensity of ambient light changes, and adjust the brightness of the backlight module based on the number of photoelectron changes.

[0060] The touch sensor 1 may include a touch screen and a sensor, with the sensor disposed within the touch screen. The photosensitive module 2 is disposed on the touch sensor 1; this can mean that the photosensitive module 2 is disposed on the surface of the touch screen, or that there are other layers disposed between the photosensitive module 2 and the touch screen.

[0061] In the backlight dimming circuit 10 of the above embodiment, the ambient light of the environment where the backlight module is located is sensed by the photosensitive module 2 set on the touch sensor 1. When the intensity of the ambient light changes, the number of photoelectrons in the photosensitive module 2 also changes. The touch module 3 is connected to the photosensitive module 2. The touch module 3 obtains the number of photoelectrons in the photosensitive module 2 when the intensity of the ambient light changes, and adjusts the brightness of the backlight module based on the number of photoelectrons to achieve automatic adjustment of the brightness of the backlight module, so that the backlight module can adapt to applications in different environments and save energy.

[0062] In one embodiment, such as Figure 2 As shown, the photosensitive module 2 includes a photoresistor R and a capacitor C; the first end of the photoresistor R is connected to the touch module 3; the first end of the capacitor C is connected to the second end of the photoresistor R, and the second end of the capacitor C is grounded.

[0063] Because light energy causes electrons in the material of the photoresistor R to detach from the atoms and become free electrons, increasing the material's conductivity, the resistance of the photoresistor R decreases when the ambient light intensity changes from low to high. In other words, when the light intensity is high, the resistance of the photoresistor R decreases. Typically, the resistance of the photoresistor R can be reduced from 10 MΩ (in darkness) to approximately 1 kΩ (in sunlight). Therefore, using a photoresistor R allows for sensitive detection of changes in ambient light.

[0064] In one embodiment, see still Figure 2The touch module 3 includes a touch unit 31 and a control unit 32. The touch unit 31 is connected to the photosensitive module 2 and is used to acquire the number of photoelectron changes in the photosensitive module 2 when the ambient light intensity changes. The control unit 32 is used to adjust the brightness of the backlight module based on the number of photoelectron changes.

[0065] The touch unit 31 obtains the number of photoelectron changes of the photosensitive module 2 when the ambient light intensity changes, and outputs a control signal to the control unit 32, so that the control unit 32 adjusts the brightness of the backlight module; the control signal is transmitted through PWM (pulse width modulation) or I2C (inter-integrated circuit).

[0066] Among them, see Figure 3 When the ambient light intensity increases, the number of photoelectrons, n, decreases; when the ambient light intensity decreases, the number of photoelectrons, n, increases. Therefore, the change in the number of photoelectrons, n, caused by changes in ambient light intensity can be compared and calculated by the touch unit 31. When the ambient light intensity increases, the number of photoelectrons, n, increases, and the calculated difference in the number of photoelectrons, Δn, is a positive value. The control unit 32 automatically controls the brightness of the backlight module to decrease based on the difference in the number of photoelectrons, Δn. When the ambient light intensity decreases, the number of photoelectrons, n, increases, and the calculated difference in the number of photoelectrons, Δn, is a positive value. The control unit 32 automatically controls the brightness of the backlight module to increase based on the difference in the number of photoelectrons, Δn.

[0067] In one embodiment, see still Figure 2 The touch unit 31 includes a comparator COM and a single-pole double-throw switch K. The input terminal of the comparator COM is connected to the first terminal of the photoresistor R and is used to obtain the number of photoelectron changes of the photosensitive module 2 when the ambient light intensity changes. The moving terminal of the single-pole double-throw switch K is connected to the second terminal of the capacitor C. The first stationary terminal of the single-pole double-throw switch K is connected to the first terminal of the photoresistor R and the input terminal of the comparator COM, respectively. The second stationary terminal of the single-pole double-throw switch K is connected to the output terminal of the comparator COM and is used to control the on / off state of the touch unit 31.

[0068] The comparator COM can compare and calculate the difference in the number of photoelectrons before and after the change caused by the change in ambient light intensity.

[0069] In one embodiment, see still Figure 2The control unit 32 may include a pulse width modulator (PWM) and a clock signal timer. The input terminal of the pulse width modulator (PWM) is connected to the output terminal of the comparator (COM) and the second stationary terminal of the single-pole double-throw switch (K) respectively, and is used to adjust the brightness of the backlight module. The clock signal timer is connected to the output terminal of the pulse width modulator (PWM) and is used to control the comparator (COM) to obtain the number of photoelectron changes of the photosensitive module 2 when the light intensity changes at preset intervals.

[0070] The signal input terminal T1 of the clock signal timer is connected to the signal transmitter. The signal transmitter inputs a clock command to the clock signal timer, instructing the clock signal timer to work according to the clock command.

[0071] In one embodiment, the photosensitive module 2 may be disposed on the touch-sensing surface of the touch sensor 1.

[0072] In one embodiment, such as Figure 4 As shown, the touch sensing surface of the touch sensor 1 includes a touch area 11 and a non-touch area 12; the number of photosensitive modules 2 can be multiple, and multiple photosensitive modules 2 are spaced apart in the non-touch area 12.

[0073] For example, see still Figure 4 The number of photosensitive modules 2 can be up to 4; the 4 photosensitive modules 2 can be distributed in the four corner areas of the touch sensing surface of the touch sensor 1.

[0074] In one embodiment, such as Figure 5 As shown, the photosensitive module 2 may include: conductive strips 21 arranged at intervals and a photosensitive structure 22; the conductive strips 21 arranged at intervals are located on the touch sensing surface of the touch sensor 1; the photosensitive structure 22 is located on the touch sensing surface of the touch sensor 1 and is located between adjacent conductive strips 21.

[0075] The material of the conductive strip 21 may include, but is not limited to, at least one of copper, silver, gold, tin, and aluminum, or other conductive materials; this embodiment is not limited to any of these. The material of the photosensitive structure 22 may include, but is not limited to, at least one of CdS (cadmium sulfide) and CdSe (cadmium selenide), or other photosensitive materials; this embodiment is not limited to any of these.

[0076] Combination Figure 2 This can be understood as follows: when the structure formed by the spaced conductive strips 21 and the photosensitive structure 22 is used as the photosensitive module 2 in the entire circuit, the equivalent circuit of the photosensitive module 2 is as follows: Figure 2 The diagram shows a photoresistor R and a capacitor C.

[0077] like Figure 6As shown, this application also provides a display device 100, which includes: a backlight module 30, a power drive circuit 20, and a backlight dimming circuit 10 according to any embodiment of this application. The power drive circuit 20 is connected to the backlight module 30 and is used to drive the backlight module 30 to work. The backlight dimming circuit 10 of this application is connected to the power drive circuit 20 and is used to adjust the brightness of the backlight module 30.

[0078] The display device 100 in the above embodiments includes the backlight dimming circuit 10 of this application. The backlight module 30 is connected to the backlight dimming circuit 10 of this application through the power drive circuit 20. The ambient light of the environment in which the backlight module 30 is located is sensed by the photosensitive module 2 disposed on the touch sensor 1. When the intensity of the ambient light changes, the number of photoelectrons of the photosensitive module 2 also changes. The touch module 3 is connected to the photosensitive module 2. The touch module 3 obtains the number of photoelectron changes of the photosensitive module 2 when the intensity of the ambient light changes, and adjusts the brightness of the backlight module 30 based on the number of photoelectron changes to achieve automatic adjustment of the brightness of the backlight module 30, so that the display device 100 of this application can adapt to applications in different environments and save energy.

[0079] In one embodiment, such as Figure 7 As shown, the display device 100 may further include: an optical anti-reflection film 40 and a cover plate 60; the optical anti-reflection film 40 is located on the side of the photosensitive module 2 away from the touch sensor 1; the cover plate 60 is located on the side of the optical anti-reflection film 40 away from the photosensitive module 2.

[0080] In one embodiment, see still Figure 7 The display device 100 also includes an ink layer 50; the ink layer 50 is located between the cover plate 60 and the optical anti-reflective film 40, and the ink layer 50 has a window, through which the photosensitive module 2 is at least partially exposed.

[0081] The ink layer 50 may include at least one of a red ink layer, a green ink layer, and a blue ink layer; it can be understood that the ink layer 50 may simultaneously include a red ink layer, a green ink layer, and a blue ink layer, with the red ink layer, green ink layer, and blue ink layer arranged alternately; the ink layer 50 may also include a red ink layer and a green ink layer, with the red ink layer and green ink layer arranged alternately; the ink layer 50 may also include a red ink layer and a blue ink layer, with the red ink layer and blue ink layer arranged alternately; the ink layer 50 may also include a blue ink layer and a green ink layer, with the blue ink layer and green ink layer arranged alternately; the ink layer 50 may also include any one of a red ink layer, a green ink layer, and a blue ink layer.

[0082] In one embodiment, see still Figure 4The touch sensing surface of the touch sensor 1 includes a touch area 11 and a non-touch area 12; the number of photosensitive modules 2 can be multiple, and multiple photosensitive modules 2 are spaced apart in the non-touch area 12.

[0083] For example, see still Figure 4 The number of photosensitive modules 2 can be up to 4; the 4 photosensitive modules 2 can be distributed in the four corner areas of the touch sensing surface of the touch sensor 1.

[0084] In one embodiment, see still Figure 5 The photosensitive module 2 may include: spaced conductive strips 21 and photosensitive structure 22; the spaced conductive strips 21 are located on the touch sensing surface of the touch sensor 1; the photosensitive structure 22 is located on the touch sensing surface of the touch sensor 1 and is located between adjacent conductive strips 21.

[0085] The material of the conductive strip 21 may include, but is not limited to, at least one of copper, silver, gold, tin, and aluminum, or other conductive materials; this embodiment is not limited to any other material. The material of the photosensitive structure 22 may include, but is not limited to, at least one of CdS and CdSe, or other photosensitive materials; this embodiment is not limited to any other material.

[0086] Combination Figure 2 This can be understood as follows: when the structure formed by the spaced conductive strips 21 and the photosensitive structure 22 is used as the photosensitive module 2 in the entire circuit, the equivalent circuit of the photosensitive module 2 is as follows: Figure 2 The diagram shows a photoresistor R and a capacitor C.

[0087] During manufacturing, conductive strips 21 and photosensitive structures 22 arranged at intervals can be fabricated on the surface of touch sensor 1 at the same time as the various circuits of touch sensor 1.

[0088] In one embodiment, the photosensitive module 2 includes: a printed circuit board (PCB), spaced conductive strips 21, and a photosensitive structure 22; the printed circuit board is located on the touch sensing surface of the touch sensor 1; the spaced conductive strips 21 are located on the side of the printed circuit board away from the touch sensing surface; the photosensitive structure 22 is located on the side of the printed circuit board away from the touch sensing surface and is located between adjacent conductive strips 21.

[0089] It can be understood that the conductive strip 21 and the photosensitive structure 22 can be directly set on the touch sensing surface of the touch sensor 1; or the conductive strip 21 and the photosensitive structure 22 can be first set on the surface of the printed circuit board, and then the printed circuit board with the conductive strip 21 and the photosensitive structure 22 is set on the touch sensing surface of the touch sensor 1.

[0090] In other embodiments, the conductive strip 21 and the photosensitive structure 22 may be first disposed on the surface of the FPC (flexible printed circuit board), and then the FPC with the conductive strip 21 and the photosensitive structure 22 may be disposed on the touch sensing surface of the touch sensor 1.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A backlight dimming circuit, characterized in that, include: Touch sensor; A photosensitive module is disposed on the touch sensor and is used to sense the ambient light of the environment in which the backlight module is located. A touch module, connected to the photosensitive module, is used to acquire the number of photoelectron changes in the photosensitive module when the intensity of ambient light changes, and to adjust the brightness of the backlight module based on the number of photoelectron changes. The photosensitive module includes: a photoresistor, the first end of which is connected to the touch module; and a capacitor, the first end of which is connected to the second end of the photoresistor, and the second end of which is grounded. The photosensitive module further includes: conductive strips arranged at intervals, located on the touch sensing surface of the touch sensor; a photosensitive structure, located on the touch sensing surface of the touch sensor and between adjacent conductive strips; the equivalent circuit of the conductive strips and the photosensitive structure includes the photoresistor and the capacitor; The touch sensing surface of the touch sensor includes a touch area and a non-touch area; the photosensitive module is located in the non-touch area.

2. The backlight dimming circuit according to claim 1, characterized in that, The touch module includes: A touch unit, connected to the photosensitive module, is used to acquire the number of photoelectron changes in the photosensitive module when the intensity of ambient light changes; A control unit is used to adjust the brightness of the backlight module based on the amount of photoelectron changes.

3. The backlight dimming circuit according to claim 2, characterized in that, The touch unit includes: A comparator, the input of which is connected to the first end of the photoresistor, is used to obtain the number of photoelectron changes of the photosensitive module when the intensity of ambient light changes; A single-pole double-throw switch is provided, wherein the moving end of the single-pole double-throw switch is connected to the second end of the capacitor, the first stationary end of the single-pole double-throw switch is connected to the first end of the photoresistor and the input end of the comparator respectively, and the second stationary end of the single-pole double-throw switch is connected to the output end of the comparator, for controlling the on / off state of the touch unit.

4. The backlight dimming circuit according to claim 3, characterized in that, The control unit includes: A pulse width modulator, wherein the input terminal of the pulse width modulator is connected to the output terminal of the comparator and the second stationary terminal of the single-pole double-throw switch respectively, and is used to adjust the brightness of the backlight module; A clock signaler, connected to the output of the pulse width modulator, is used to control the comparator to acquire the number of photoelectron changes of the photosensitive module when the light intensity changes at preset intervals.

5. The backlight dimming circuit according to claim 1, characterized in that, The photosensitive module is disposed on the touch-sensing surface of the touch sensor.

6. A display device, characterized in that, include: Backlight module; A power drive circuit, connected to the backlight module, is used to drive the backlight module to work; The backlight dimming circuit according to any one of claims 1 to 5 is connected to the power drive circuit and is used to adjust the brightness of the backlight module.

7. The display device according to claim 6, characterized in that, The display device further includes: An optical anti-reflective coating is located on the side of the photosensitive module away from the touch sensor; The cover plate is located on the side of the optical antireflective film away from the photosensitive module.

8. The display device according to claim 7, characterized in that, The display device further includes: An ink layer is located between the cover plate and the optical antireflective film. The ink layer has a window, and the photosensitive module is at least partially exposed through the window.

9. The display device according to claim 8, characterized in that, The ink layer includes at least one of a red ink layer, a green ink layer, and a blue ink layer.

10. The display device according to claim 6, characterized in that, The photosensitive module includes: A printed circuit board is located on the touch-sensing surface of the touch sensor; The conductive strips are spaced apart and located on the side of the printed circuit board away from the touch-sensing surface; A photosensitive structure is located on the side of the printed circuit board away from the touch-sensing surface and between adjacent conductive strips.

11. The display device according to claim 6, characterized in that, The number of photosensitive modules is multiple, and the multiple photosensitive modules are arranged at intervals within the non-touch area.

12. The display device according to claim 11, characterized in that, The number of photosensitive modules includes four; the four photosensitive modules are distributed in the four corner areas of the touch sensing surface of the touch sensor.

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