Driving module and display device

Abstract

The invention belongs to the field of display, and particularly relates to a driving module and a display device.The driving module comprises a power supply unit, a first transistor, a voltage acquisition unit and a comparison unit, the first end of the first transistor is connected with the power supply unit, and the second end of the first transistor is connected with a display light-emitting unit through a first node; the voltage obtaining unit comprises a first voltage dividing device and a second voltage dividing device, the first node is connected with a grounding end through the first voltage dividing device, the second node and the second voltage dividing device, a first input end of the comparison unit is connected with a reference power supply, and a second input end of the comparison unit is connected with the second node; the output end of the comparison unit is connected with the control end of the first transistor, the resistance value of the first voltage divider is positively correlated with the viewing distance, and the resistance value of the second voltage divider is negatively correlated with the ambient brightness. When the watching distance of the user is reduced or the ambient brightness is reduced, the brightness of the display light-emitting unit is reduced, so that the watching experience of the user can be improved and the power consumption can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of display, and specifically relates to a driving module and a display device. Background Art

[0002] Displays include liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays. Display devices such as LCDs and OLEDs have the advantages of high brightness, high contrast, and a wide color gamut, and are widely used in electronic devices such as mobile phones and notebooks.

[0003] The user's perception of the display effect presented by the display in terms of brightness, contrast and color gamut will vary depending on the brightness difference of the environment and the change of viewing distance. For example, in an outdoor place with direct sunlight, if the brightness of the display is not enough, the picture will appear very dim and the colors will not be bright, making it difficult to see the details and colors of the picture. On the contrary, in a darker environment, the brightness of the display can be appropriately reduced. Too high brightness will cause discomfort to the human eye, and in a dark environment, a lower brightness screen can also show good contrast and color saturation.

[0004] The brightness of existing displays cannot be adjusted according to the ambient brightness, viewing distance, etc. For example, in a dark environment, the brightness of the display is too high, which not only affects the user's viewing experience, but also easily causes increased power consumption. Summary of the invention

[0005] The purpose of this application is to provide a driving module and a display device to automatically adjust the brightness of the display according to environmental factors to improve the user's viewing experience.

[0006] In order to achieve the above object, the present application provides a driving module, including a power supply unit, which is at least used to supply power to the display light-emitting unit, and the driving module also includes:

[0007] a first transistor, wherein a first end of the first transistor is connected to the power supply unit, and a second end of the first transistor is connected to the display light-emitting unit via a first node;

[0008] a voltage acquisition unit connected between the first node and the ground terminal, the voltage acquisition unit comprising a first voltage divider device and a second voltage divider device, the first voltage divider device and the second voltage divider device being connected via a second node;

[0009] a comparison unit, wherein a first input terminal of the comparison unit is connected to a reference power supply, a second input terminal of the comparison unit is connected to the second node, an output terminal of the comparison unit is connected to a control terminal of the first transistor, when a voltage of the second node is greater than a voltage of the reference power supply, the comparison unit controls the first transistor to be turned off, and when a voltage of the second node is less than a voltage of the reference power supply, the comparison unit controls the first transistor to be turned on;

[0010] The resistance value of the first voltage divider is positively correlated with the viewing distance, and / or the resistance value of the second voltage divider is negatively correlated with the ambient brightness.

[0011] Optionally, the first voltage divider device includes an infrared sensor, and the resistance value of the infrared sensor is positively correlated with the viewing distance;

[0012] The second voltage divider device includes a photoresistor, and a resistance value of the photoresistor is negatively correlated with ambient brightness.

[0013] Optionally, the driving module includes a first resistor, the first resistor is connected to the power supply unit and a first input terminal of the comparison unit, and the reference power supply includes the first resistor.

[0014] Optionally, the driving module further includes a Zener diode, the first resistor and the first input end of the comparison unit are connected via a third node, the anode of the Zener diode is connected to the ground end, and the cathode of the Zener diode is connected to the third node.

[0015] Optionally, the driving module also includes a second transistor and a protection unit, the first end of the second transistor is connected to the third node, the second end of the second transistor is connected to the first input end of the comparison unit, the protection unit is connected to at least the power supply unit, the third node and the control end of the second transistor, and the protection unit is used to control the second transistor to turn off when the output voltage of the power supply unit is greater than a preset value.

[0016] Optionally, the second transistor is a P-type field effect transistor, the protection unit includes a second resistor and a third transistor, the first end of the third transistor is connected to the power supply unit, the second end of the third transistor is connected to the control end of the second transistor, and the control end of the third transistor is connected to the third node through the second resistor.

[0017] Optionally, the third transistor is a triode, and the protection unit also includes a third resistor and a fourth resistor. The second end of the third transistor is connected to the control end of the second transistor through a fourth node, the third resistor is connected to the power supply unit and the fourth node, and the fourth resistor is connected to the fourth node and the ground end.

[0018] Optionally, the second transistor is an N-type field effect transistor, and the protection unit includes a second resistor, a third resistor, a fourth resistor and a third transistor, the control end of the third transistor is connected to the third node through the second resistor, the first end of the third transistor is connected to the power supply unit through the fifth node and the third resistor, the control end of the second transistor is connected to the fifth node, and the second end of the third transistor is connected to the ground end through the fourth resistor.

[0019] Optionally, the protection unit further includes an indicator light, which is connected in series between the ground terminal and the second terminal of the third transistor.

[0020] The present application also provides a display device, comprising:

[0021] The driving module;

[0022] A display light emitting unit is connected to the driving module.

[0023] The driving module and display device disclosed in this application have the following beneficial effects:

[0024] In the present application, the driving module includes a power supply unit, a first transistor, a voltage acquisition unit and a comparison unit. The power supply unit is at least used to supply power to the display light-emitting unit. The first end of the first transistor is connected to the power supply unit, and the second end of the first transistor is connected to the display light-emitting unit through a first node. The voltage acquisition unit includes a first voltage divider and a second voltage divider. The first node is connected to the ground terminal through the first voltage divider, the second node, and the second voltage divider. The first input terminal of the comparison unit is connected to the reference power supply, the second input terminal of the comparison unit is connected to the second node, and the output terminal of the comparison unit is connected to the control terminal of the first transistor. The resistance value of the first voltage divider is positively correlated with the viewing distance, and / or the resistance value of the second voltage divider is negatively correlated with the ambient brightness. When the user's viewing distance decreases or the ambient brightness decreases, the brightness of the display light-emitting unit decreases. The brightness of the display light-emitting unit can change with the user's viewing distance and the ambient brightness, which can not only improve the user's viewing experience, but also reduce power consumption.

[0025] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of the driving module in Example 1 of the present application.

[0029] Figure 2 It is a structural diagram of the driving module in the second embodiment of the present application.

[0030] Figure 3 It is a structural diagram of the drive module in Example 3 of the present application.

[0031] Figure 4 It is a structural diagram of the drive module in the fourth embodiment of the present application.

[0032] Figure 5 It is a structural diagram of the drive module in Example 5 of the present application.

[0033] Description of reference numerals:

[0034] 100, power supply unit; 101, ground terminal; 200, first transistor; 300, voltage acquisition unit; 310, first voltage divider; 320, second voltage divider; 400, comparison unit; 500, first resistor; 600, voltage regulator diode; 700, second transistor; 800, protection unit; 810, second resistor; 820, third resistor; 830, fourth resistor; 840, third transistor; 850, indicator light;

[0035] 10. Driving module; 21. Display light-emitting unit. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0037] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0038] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0039] Embodiment 1

[0040] See also Figure 1 As shown, in this embodiment, the driving module 10 includes a power supply unit 100, a first transistor 200, a voltage acquisition unit 300 and a comparison unit 400. The power supply unit 100 may include a power management chip (Power Management integrated circuit, PMIC), and the power supply unit 100 is at least used to supply power to the display light-emitting unit 21. The driving module 10 is used for a display device. When the display device is a liquid crystal display, the liquid crystal display includes a backlight module, and the display light-emitting unit 21 can be a light-emitting diode (LED) of the backlight module; when the display device is an organic light-emitting diode display, the display light-emitting unit 21 can be an organic light-emitting diode of the display panel.

[0041] The first end of the first transistor 200 is connected to the power supply unit 100, and the second end of the first transistor 200 is connected to the display light-emitting unit 21 through the first node A. The voltage acquisition unit 300 includes a first voltage divider device 310 and a second voltage divider device 320, and the first node A is connected to the ground terminal 101 through the first voltage divider device 310, the second node B, and the second voltage divider device 320. The first input end of the comparison unit 400 is connected to the reference power supply, the second input end of the comparison unit 400 is connected to the second node B, and the output end of the comparison unit 400 is connected to the control end of the first transistor 200. The comparison unit 400 may include an operational amplifier or a comparator, the first input end of the comparison unit 400 may be a non-inverting input end, and the second input end of the comparison unit 400 may be an inverting input end.

[0042] The first transistor 200 is an N-type metal oxide field effect transistor (NMOS). When the voltage Vfb of the second node B is greater than the voltage Vref of the reference power supply, the comparison unit 400 outputs a low-level signal to control the first transistor 200 to be turned off, and the output voltage Vout of the driving module 10 decreases; when the voltage Vfb of the second node B is less than the voltage Vref of the reference power supply, the comparison unit 400 outputs a high-level signal to control the first transistor 200 to be turned on, and the output voltage Vout of the driving module 10 increases.

[0043] The output voltage of the power supply unit 100 is Vcc, and the output voltage of the driving module 10 (i.e., the voltage of the first node A) is Vout. Since the first transistor 200 can switch quickly, the output voltage Vout of the driving module 10 is determined by the turn-on duty cycle of the first transistor 200. The output voltage Vout of the driving module 10 is:

[0044] Vout=(Vref / R2)×(R1+R2)=((R1+R2) / R2)×Vref=(1+R1 / R2)×Vref;

[0045] Wherein, R1 is the resistance value of the first voltage divider device 310 , and R2 is the resistance value of the second voltage divider device 320 .

[0046] The resistance value of at least one device in the voltage acquisition unit 300 can change with the environment. For example, the resistance value of the first voltage divider device 310 is positively correlated with the viewing distance, and the resistance value of the second voltage divider device 320 remains unchanged. When the user's viewing distance increases, the resistance value of the first voltage divider device 310 increases, the output voltage Vout of the driving module 10 increases, and the brightness of the display light-emitting unit 21 increases, thereby improving the user's viewing experience; correspondingly, when the user's viewing distance decreases, the resistance value of the first voltage divider device 310 decreases, the output voltage Vout of the driving module 10 decreases, and the brightness of the display light-emitting unit 21 decreases, which can both improve the user's viewing experience and reduce power consumption.

[0047] In some embodiments, the resistance value of the second voltage divider device 320 is negatively correlated with the ambient brightness, and the resistance value of the first voltage divider device 310 remains unchanged. When the ambient brightness increases, the resistance value of the second voltage divider device 320 decreases, the output voltage Vout of the driving module 10 increases, and the brightness of the display light-emitting unit 21 increases, thereby improving the user's viewing experience; correspondingly, when the ambient brightness decreases, the resistance value of the second voltage divider device 320 increases, the output voltage Vout of the driving module 10 decreases, and the brightness of the display light-emitting unit 21 decreases, which can improve the user's viewing experience and reduce power consumption.

[0048] In some embodiments, the resistance value of the first voltage divider 310 is positively correlated with the viewing distance, and the resistance value of the second voltage divider 320 is negatively correlated with the ambient brightness, and the brightness of the display light-emitting unit 21 is affected by both the user's viewing distance and the ambient brightness.

[0049] The brightness of the display cannot be adjusted according to the ambient brightness, viewing distance, etc. For example, in a dark environment, the brightness of the display is too high, which not only affects the user's viewing experience, but also easily causes increased power consumption.

[0050] In this embodiment, the driving module 10 includes a power supply unit 100, a first transistor 200, a voltage acquisition unit 300 and a comparison unit 400. The power supply unit 100 is at least used to supply power to the display light-emitting unit 21. The first end of the first transistor 200 is connected to the power supply unit 100, and the second end of the first transistor 200 is connected to the display light-emitting unit 21 through a first node A. The voltage acquisition unit 300 includes a first voltage divider device 310 and a second voltage divider device 320. The first node A is connected to the ground terminal 101 through the first voltage divider device 310, the second node B, and the second voltage divider device 320. The first input terminal of the comparison unit 400 is connected to the reference power supply, the second input terminal of the comparison unit 400 is connected to the second node B, and the output terminal of the comparison unit 400 is connected to the control terminal of the first transistor 200. The resistance value of the first voltage divider device 310 is positively correlated with the viewing distance, and / or the resistance value of the second voltage divider device 320 is negatively correlated with the ambient brightness. When the user's viewing distance decreases or the ambient brightness decreases, the brightness of the display light-emitting unit 21 decreases. The brightness of the display light-emitting unit 21 can change with the user's viewing distance and ambient brightness, which can not only improve the user's viewing experience but also reduce power consumption.

[0051] It should be noted that the first transistor 200 may be an N-type metal oxide field effect transistor, but is not limited thereto. The first transistor 200 may also be a P-type metal oxide field effect transistor (PMOS), depending on the specific situation. When the first transistor 200 is a P-type metal oxide field effect transistor, the first voltage divider device 310 and the second voltage divider device 320 are interchanged. In other embodiments, the first transistor 200 may also be a triode.

[0052] In some embodiments, the first voltage divider device 310 includes an infrared sensor, and the resistance value of the infrared sensor is positively correlated with the viewing distance, that is, the greater the viewing distance of the user, the greater the resistance value of the first voltage divider device 310. The second voltage divider device 320 includes a photoresistor, and the resistance value of the photoresistor is negatively correlated with the ambient brightness, that is, the greater the ambient brightness, the smaller the resistance value of the second voltage divider device 320.

[0053] The first voltage divider device 310 is an infrared sensor, and the second voltage divider device 320 is a photoresistor. The device structure is simple, which can reduce the production cost of the driving module 10 and realizes that the brightness of the display light-emitting unit 21 increases when the user's viewing distance increases, and the brightness of the display light-emitting unit 21 increases when the ambient brightness increases.

[0054] In some embodiments, the driving module 10 includes a first resistor 500 , the first resistor 500 is connected to the power supply unit 100 and the first input terminal of the comparison unit 400 , and the reference power source includes the first resistor 500 .

[0055] The voltage Vref of the reference power supply is less than the output voltage Vcc of the power supply unit 100. The first resistor 500 connects the power supply unit 100 and the first input terminal of the comparison unit 400. The voltage Vref of the reference power supply is generated by dividing the output voltage Vcc of the power supply unit 100 through the first resistor 500, which can reduce the number of output voltages of the driving module 10.

[0056] It should be noted that the reference power voltage Vref is generated by dividing the output voltage Vcc of the power supply unit 100 through the first resistor 500, but is not limited thereto. The reference power voltage Vref may also be directly generated by a power management chip, depending on the specific situation.

[0057] Embodiment 2

[0058] The main difference between the second embodiment and the first embodiment is that the driving module 10 in the second embodiment further includes an overvoltage protection circuit.

[0059] See also Figure 2 As shown, the driving module 10 further includes a Zener diode 600, the first resistor 500 and the first input end of the comparison unit 400 are connected via a third node C, the anode of the Zener diode 600 is connected to the ground terminal 101, and the cathode of the Zener diode 600 is connected to the third node C. The Zener diode 600 includes a transient voltage suppressor diode (TVS).

[0060] When the output voltage Vcc of the power supply unit 100 is within a normal range, due to the clamping effect of the Zener diode 600, the voltage Vref of the reference power supply remains unchanged, and the output voltage Vout of the driving module 10 is stable; when the output voltage Vcc of the power supply unit 100 is too high, the Zener diode 600 is broken down, the voltage Vref of the reference power supply is pulled down, and the output voltage Vout of the driving module 10 is also reduced, thereby protecting the display light-emitting unit 21 and preventing the display light-emitting unit 21 from being damaged due to excessive output voltage Vout.

[0061] The output voltage Vout of the driving module 10 is related to the resistance values ​​of the first voltage divider device 310 and the second voltage divider device 320. When the resistance value of the first voltage divider device 310 increases, the output voltage Vout of the driving module 10 increases; when the resistance value of the second voltage divider device 320 decreases, the output voltage Vout of the driving module 10 increases. In some embodiments, the maximum value of the output voltage Vout of the driving module 10 can be limited by limiting the resistance value range of the first voltage divider device 310 and the second voltage divider device 320, thereby protecting the display light-emitting unit 21 and preventing the display light-emitting unit 21 from being damaged due to excessive output voltage Vout.

[0062] Embodiment 3

[0063] The main difference between the third embodiment and the second embodiment is that the structure of the overvoltage protection circuit is different. The overvoltage protection circuit in the second embodiment includes a voltage stabilizing diode 600, see Figure 3 As shown, the overvoltage protection circuit in the second embodiment includes a voltage stabilizing diode 600, a second transistor 700 and a protection unit 800. The first end of the second transistor 700 is connected to the third node C, and the second end of the second transistor 700 is connected to the first input end of the comparison unit 400. The protection unit 800 is connected to at least the power supply unit 100, the third node C and the control end of the second transistor 700, and the protection unit 800 is used to control the second transistor 700 to turn off when the output voltage Vcc of the power supply unit 100 is greater than a preset value.

[0064] When the output voltage Vcc of the power supply unit 100 is within a normal range, the protection unit 800 controls the second transistor 700 to turn on, and the comparison unit 400 and the driving module 10 work normally; when the output voltage Vcc of the power supply unit 100 is too high, the protection unit 800 controls the second transistor 700 to turn off, the voltage Vref of the reference power supply is 0, and the output voltage Vout of the driving module 10 is 0, thereby protecting the display light-emitting unit 21 and preventing the output voltage Vout from being too large and causing damage to the display light-emitting unit 21.

[0065] It should be noted that the breakdown of the Zener diode 600 requires the accumulation of charge, and the turn-on time of the Zener diode 600 is greater than the turn-on time of the second transistor 700. The second transistor 700 and the protection unit 800 are provided to cut off the reference power supply, further preventing the output voltage Vout from being too large and causing damage to the display light-emitting unit 21. In addition, the triggering protection voltage of the second transistor 700 and the protection unit 800 can also be set to be lower than the voltage of the Zener diode 600 to trigger the protection, thereby reducing the probability of the Zener diode 600 triggering the work, thereby extending the service life of the Zener diode 600.

[0066] In some embodiments, the second transistor 700 is an N-type metal oxide field effect transistor, and the protection unit 800 includes a second resistor 810, a third resistor 820, a fourth resistor 830 and a third transistor 840. The control end of the third transistor 840 is connected to the third node C through the second resistor 810, the first end of the third transistor 840 is connected to the power supply unit 100 through the fifth node E and the third resistor 820, the control end of the second transistor 700 is connected to the fifth node E, and the second end of the third transistor 840 is connected to the ground terminal 101 through the fourth resistor 830. The third transistor 840 includes an N-type metal oxide field effect transistor or a triode.

[0067] When the output voltage Vcc of the power supply unit 100 is within a normal range, the third transistor 840 is turned off, the output voltage Vcc of the power supply unit 100 controls the second transistor 700 to turn on, and the comparison unit 400 and the driving module 10 work normally; when the output voltage Vcc of the power supply unit 100 is too high, the third transistor 840 is turned on, the voltage of the fifth node E controls the second transistor 700 to turn off, the voltage Vref of the reference power supply is 0, and the output voltage Vout of the driving module 10 is 0, thereby protecting the display light-emitting unit 21 and preventing the output voltage Vout from being too large and causing damage to the display light-emitting unit 21.

[0068] In some embodiments, the protection unit 800 further includes an indicator light 850, which is connected in series between the ground terminal 101 and the second terminal of the third transistor 840. The indicator light 850 includes a light emitting diode.

[0069] When the output voltage Vcc of the power supply unit 100 is within the normal range, the third transistor 840 is turned off and the indicator light 850 does not emit light; when the output voltage Vcc of the power supply unit 100 is too high, the third transistor 840 is turned on and the indicator light 850 is lit, indicating that the reason why the light-emitting unit 21 does not emit light is that the output voltage Vcc of the power supply unit 100 is too high.

[0070] Embodiment 4

[0071] The main difference between the fourth embodiment and the third embodiment is that the structure of the protection unit 800 is different.

[0072] See also Figure 4 As shown, the second transistor 700 is a P-type field effect transistor, the protection unit 800 includes a second resistor 810 and a third transistor 840, a first end of the third transistor 840 is connected to the power supply unit 100, a second end of the third transistor 840 is connected to the control end of the second transistor 700, and the control end of the third transistor 840 is connected to the third node C through the second resistor 810. The third transistor 840 includes an N-type metal oxide field effect transistor or a triode.

[0073] When the output voltage Vcc of the power supply unit 100 is within a normal range, the third transistor 840 is turned off and the second transistor 700 is turned on, and the comparison unit 400 and the driving module 10 work normally; when the output voltage Vcc of the power supply unit 100 is too high, the third transistor 840 is turned on, and the output voltage Vcc of the power supply unit 100 controls the second transistor 700 to be turned off, the voltage Vref of the reference power supply is 0, and the output voltage Vout of the driving module 10 is 0, thereby protecting the display light-emitting unit 21 and preventing the output voltage Vout from being too large and causing damage to the display light-emitting unit 21.

[0074] In some embodiments, the protection unit 800 further includes an indicator light 850, which is connected in series between the ground terminal 101 and the second terminal of the third transistor 840. The indicator light 850 includes a light emitting diode.

[0075] When the output voltage Vcc of the power supply unit 100 is within the normal range, the third transistor 840 is turned off and the indicator light 850 does not emit light; when the output voltage Vcc of the power supply unit 100 is too high, the third transistor 840 is turned on and the indicator light 850 is lit, indicating that the reason why the light-emitting unit 21 does not emit light is that the output voltage Vcc of the power supply unit 100 is too high.

[0076] In some embodiments, the third transistor 840 is a triode, the protection unit 800 further includes a third resistor 820 and a fourth resistor 830, the second end of the third transistor 840 is connected to the control end of the second transistor 700 via a fourth node D, the third resistor 820 is connected to the power supply unit 100 and the fourth node D, and the fourth resistor 830 is connected to the fourth node D and the ground terminal 101. When the protection unit 800 further includes the third resistor 820 and the fourth resistor 830, the indicator light 850 can be set between the second end of the third transistor 840 and the fourth node D.

[0077] When the output voltage Vcc of the power supply unit 100 is within a normal range, the third transistor 840 is turned off, the fourth node D voltage controls the second transistor 700 to turn on, and the comparison unit 400 and the driving module 10 work normally; when the output voltage Vcc of the power supply unit 100 is too high, the third transistor 840 is turned on, the output voltage Vcc of the power supply unit 100 controls the second transistor 700 to turn off, the voltage Vref of the reference power supply is 0, and the output voltage Vout of the driving module 10 is 0, thereby protecting the display light-emitting unit 21 and preventing the output voltage Vout from being too large and causing damage to the display light-emitting unit 21.

[0078] Embodiment 5

[0079] See also Figure 5As shown, in this embodiment, the display device includes the driving module 10 and the display light-emitting unit 21 disclosed in the first to fourth embodiments, and the display light-emitting unit 21 is connected to the driving module 10. The display device may include a liquid crystal display and an organic light-emitting diode display. When the display device is a liquid crystal display, the liquid crystal display includes a backlight module, and the display light-emitting unit 21 may be a light-emitting diode of the backlight module; when the display device is an organic light-emitting diode display, the display light-emitting unit 21 may be an organic light-emitting diode of the display panel.

[0080] The display device includes a driving module 10, which includes a power supply unit 100, a first transistor 200, a voltage acquisition unit 300 and a comparison unit 400. The power supply unit 100 is at least used to supply power to the display light-emitting unit 21. The first end of the first transistor 200 is connected to the power supply unit 100, and the second end of the first transistor 200 is connected to the display light-emitting unit 21 through a first node A. The voltage acquisition unit 300 includes a first voltage divider device 310 and a second voltage divider device 320. The first node A is connected to the ground terminal 101 through the first voltage divider device 310, the second node B, and the second voltage divider device 320. The first input terminal of the comparison unit 400 is connected to a reference power supply, the second input terminal of the comparison unit 400 is connected to the second node B, and the output terminal of the comparison unit 400 is connected to the control terminal of the first transistor 200. The resistance value of the first voltage divider device 310 is positively correlated with the viewing distance, and / or the resistance value of the second voltage divider device 320 is negatively correlated with the ambient brightness. When the user's viewing distance decreases or the ambient brightness decreases, the brightness of the display light-emitting unit 21 decreases. The brightness of the display light-emitting unit 21 can change with the user's viewing distance and ambient brightness, which can not only improve the user's viewing experience but also reduce power consumption.

[0081] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0082] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0083] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. A driving module, comprising a power supply unit, at least for supplying power to a display light-emitting unit, characterized in that: The driving module also includes: a first transistor, wherein a first end of the first transistor is connected to the power supply unit, and a second end of the first transistor is connected to the display light-emitting unit via a first node; a voltage acquisition unit connected between the first node and the ground terminal, the voltage acquisition unit comprising a first voltage divider device and a second voltage divider device, the first voltage divider device and the second voltage divider device being connected via a second node; a comparison unit, wherein a first input terminal of the comparison unit is connected to a reference power supply, a second input terminal of the comparison unit is connected to the second node, an output terminal of the comparison unit is connected to a control terminal of the first transistor, when a voltage of the second node is greater than a voltage of the reference power supply, the comparison unit controls the first transistor to be turned off, and when a voltage of the second node is less than a voltage of the reference power supply, the comparison unit controls the first transistor to be turned on; The resistance value of the first voltage divider is positively correlated with the viewing distance, and / or the resistance value of the second voltage divider is negatively correlated with the ambient brightness.

2. The driving module according to claim 1, characterized in that: The first voltage divider device includes an infrared sensor, and the resistance value of the infrared sensor is positively correlated with the viewing distance; The second voltage divider device includes a photoresistor, and a resistance value of the photoresistor is negatively correlated with ambient brightness.

3. The driving module according to claim 1, characterized in that: The driving module includes a first resistor, the first resistor is connected to the power supply unit and the first input terminal of the comparison unit, and the reference power supply includes the first resistor.

4. The driving module according to claim 3, characterized in that: The driving module also includes a Zener diode, the first resistor and the first input end of the comparison unit are connected through a third node, the anode of the Zener diode is connected to the ground end, and the cathode of the Zener diode is connected to the third node.

5. The driving module according to claim 4, characterized in that: The driving module also includes a second transistor and a protection unit, the first end of the second transistor is connected to the third node, the second end of the second transistor is connected to the first input end of the comparison unit, the protection unit is connected to at least the power supply unit, the third node and the control end of the second transistor, and the protection unit is used to control the second transistor to turn off when the output voltage of the power supply unit is greater than a preset value.

6. The driving module according to claim 5, characterized in that: The second transistor is a P-type field effect transistor, the protection unit includes a second resistor and a third transistor, the first end of the third transistor is connected to the power supply unit, the second end of the third transistor is connected to the control end of the second transistor, and the control end of the third transistor is connected to the third node through the second resistor.

7. The driving module according to claim 6, characterized in that: The third transistor is a triode, and the protection unit also includes a third resistor and a fourth resistor. The second end of the third transistor is connected to the control end of the second transistor through a fourth node, the third resistor is connected to the power supply unit and the fourth node, and the fourth resistor is connected to the fourth node and the ground end.

8. The driving module according to claim 5, characterized in that: The second transistor is an N-type field effect transistor, the protection unit includes a second resistor, a third resistor, a fourth resistor and a third transistor, the control end of the third transistor is connected to the third node through the second resistor, the first end of the third transistor is connected to the power supply unit through the fifth node and the third resistor, the control end of the second transistor is connected to the fifth node, and the second end of the third transistor is connected to the ground end through the fourth resistor.

9. The driving module according to claim 6 or 8, characterized in that: The protection unit further includes an indicator light which is connected in series between the ground terminal and the second terminal of the third transistor.

10. A display device, characterized in that: include: The drive module according to any one of claims 1 to 9; A display light emitting unit is connected to the driving module.

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