Brightness self-adjusting display screen

Abstract

The utility model relates to the field of display screens, and provides a brightness self-adjusting display screen, which comprises a master control module, a power supply module, a switch module, a dimming module and an infrared induction module, the input end of the power supply module is connected with an external power supply, and the output end of the power supply module supplies power to the master control module and the infrared induction module; the infrared induction module is connected with the main control module so as to transmit detected personnel information to the main control module, the input end of the switch module is connected with the output end of the power supply module, the controlled end of the switch module is connected with the main control module, and the output end of the switch module is connected with the input end of the dimming module so as to supply power to the dimming module. The controlled end of the dimming module is connected with the PWM output end of the main control module, and the output end of the dimming module is connected with a backlight interface of a display interface so as to adjust the brightness of a display screen according to a PWM signal of the main control module; according to the utility model, the brightness can be automatically adjusted so as to realize the energy-saving requirement.

Description

Technical Field

[0001] The utility model relates to the field of display screens, and in particular to a display screen with self-adjusting brightness. Background Art

[0002] In residential areas and office buildings, advertisements are usually displayed in elevators and corridors. Compared with traditional columns, more and more users use display screens for display due to their good display effect and convenient content switching. However, in some cases, such as when there are no passengers in the elevator, the continuous high-brightness display of the display screen will consume a lot of electricity, so the display screen needs to be able to adjust the brightness to achieve energy saving needs. Utility Model Content

[0003] The problem solved by the utility model is how to provide a display screen capable of automatically adjusting brightness.

[0004] To solve the above problems, the present invention provides a display screen with self-adjusting brightness, comprising: a main control module, a power module, a switch module, a dimming module and an infrared sensing module, wherein the input end of the power module is connected to an external power supply, and the output end supplies power to the main control module and the infrared sensing module, the infrared sensing module is connected to the main control module to transmit the detected personnel information to the main control module, the input end of the switch module is connected to the output end of the power module, the controlled end is connected to the main control module, and the output end is connected to the input end of the dimming module to supply power to the dimming module, the controlled end of the dimming module is connected to the PWM output end of the main control module, and the output end is connected to the backlight interface of the display interface to adjust the brightness of the display screen according to the PWM signal of the main control module.

[0005] Furthermore, the power supply module includes a rectifier circuit and a voltage conversion circuit, the input end of the rectifier circuit is connected to an external power supply, and the output end is connected to the voltage conversion circuit.

[0006] Furthermore, the switch module includes a first MOS transistor and a second MOS transistor, the gate of the first MOS transistor is connected to the PWM output end of the main control module via a first resistor, the source is grounded, and the drain is connected to the gate of the second MOS transistor, the source of the second MOS transistor is connected to the output end of the power module, and the drain is connected to the input end of the dimming module.

[0007] Furthermore, the dimming module includes an LED driver chip, a first inductor and a first diode. The model of the LED driver chip is LP8861-Q1. The controlled end of the LED driver chip is connected to the PWM signal output end of the main control module, the signal output end is connected to the input end of the main control module, the power input end of the LED driver chip is connected to the output end of the switch module, the positive output end is connected to the anode of the first diode, the first end of the first inductor is connected to the output end of the switch module, and the second end is connected to the anode of the first diode. The cathode of the first diode is connected to the positive pole of the backlight interface in the display interface, and the negative pole of the backlight interface in the display interface is connected to the negative input end of the LED driver chip.

[0008] Furthermore, the dimming module also includes a filtering circuit and an indicator circuit. The indicator circuit is connected to the LED driver chip and is used to indicate the power-on status of the LED driver chip. The filtering circuit includes multiple parallel filter capacitors, and the filtering circuit is connected to the cathode of the first diode.

[0009] Furthermore, the dimming module further includes a voltage feedback circuit, the input end of the voltage feedback circuit is connected to the positive electrode of the backlight interface in the display interface, and the output end is connected to the feedback receiving end of the LED driver chip.

[0010] Furthermore, the display screen also includes a storage module, which is connected to the main control module and is used to store image information for display.

[0011] Furthermore, the display screen also includes an Internet of Things module, which is connected to the main control module and is used for remote control of the display screen.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The infrared sensing module can sense whether someone is approaching and transmit the personnel sensing information to the main control module. When there is someone near the display screen, the main control module controls the output of the dimming module to the display screen, so that the display screen works at normal display brightness. When there is no one near the display screen, the main control module controls the dimming module to adjust the output, reduce the brightness of the display screen, and make the display screen work at low brightness to save power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall principle structure of an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the principle structure of the switch module according to an embodiment of the present utility model;

[0016] Figure 3This is a schematic diagram of the principle structure of the dimming module according to an embodiment of the present utility model.

[0017] Description of reference numerals:

[0018] 1- Main control module; 2- Power module; 3- Infrared sensor module; 4- Switch module; 5- Dimming module; 6- Internet of Things module; 7- Storage module; 51- Filter circuit; 52- Indicator circuit; 53- Voltage feedback circuit. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0021] Throughout this specification, references to the terms "embodiment," "one embodiment," and "one implementation" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

[0022] like Figure 1 As shown, the utility model provides a display screen with self-adjusting brightness, comprising: a main control module 1, a power module 2, a switch module 4, a dimming module 5 and an infrared sensing module 3, wherein the input end of the power module 2 is connected to an external power supply, and the output end supplies power to the main control module 1 and the infrared sensing module 3, the infrared sensing module 3 is connected to the main control module 1 to transmit the detected personnel information to the main control module 1, the input end of the switch module 4 is connected to the output end of the power module 2, the controlled end is connected to the main control module 1, and the output end is connected to the input end of the dimming module 5 to supply power to the dimming module 5, the controlled end of the dimming module 5 is connected to the PWM output end of the main control module 1, and the output end is connected to the backlight interface of the display interface to adjust the brightness of the display screen according to the PWM signal of the main control module 1.

[0023] It should be noted that the switch module 4 is used to control the power supply to the dimming module 5. The dimming module 5 is controlled by the main control module 1 to adjust the output of the display backlight, thereby changing the brightness of the display screen. The infrared sensing module 3 can sense whether someone is approaching and transmit the personnel sensing information to the main control module 1. For example, when the display screen is used in an elevator, the infrared sensing module 3 scans whether there is anyone in the elevator through infrared thermal sensing. When the display screen is used in a corridor, two infrared sensing sensors can be set, located on both sides of the display screen, to form a range interactive sensing to obtain information about people near the display screen. When there is someone near the display screen, the main control module 1 controls the output of the dimming module 5 to the display screen, so that the display screen works at normal display brightness. When there is no one near the display screen, the main control module 1 controls the dimming module 5 to adjust the output, reduce the brightness of the display screen, and make the display screen work at low brightness, such as 10% brightness, to save power consumption. At the same time, compared with directly turning off the display screen, frequent switching of the display screen can be avoided through brightness adjustment, which can increase its service life.

[0024] In one embodiment of the present invention, the power module 2 includes a rectifier circuit and a voltage conversion circuit. The input end of the rectifier circuit is connected to an external power supply, and the output end is connected to the voltage conversion circuit.

[0025] It should be noted that after the external AC power enters, it is first rectified by the rectifier circuit and converted into a DC power input. The voltage conversion circuit can have multiple channels, each using a different voltage conversion chip to convert the DC power input into different supply voltages, such as 3.3V, 12V, etc. 3.3V DC is used to power the infrared sensor, the main control module 1 and the chips in the dimming module 5, etc., and 12V is used to power the dimming input.

[0026] In one embodiment of the present utility model, the switch module 4 includes a first MOS transistor and a second MOS transistor, the gate of the first MOS transistor is connected to the PWM output end of the main control module 1 via a first resistor, the source is grounded, and the drain is connected to the gate of the second MOS transistor, the source of the second MOS transistor is connected to the output end of the power module 2, and the drain is connected to the input end of the dimming module 5.

[0027] It should be noted that if Figure 2 As shown, when the dimming module 5 needs to be powered, the main control module 1 sends a high-level signal to the gate of the first MOS transistor Q3, and the first MOS transistor Q3 is turned on, so that the gate of the second MOS transistor Q2 is grounded, and a voltage difference is generated between the source and gate of the second MOS transistor Q2, and then the second MOS transistor Q2 is turned on. The 12V DC power VDD-12V powers the subsequent dimming module 5 through the second MOS transistor Q2.

[0028] In one embodiment of the present utility model, the dimming module 5 includes an LED driver chip, a first inductor and a first diode. The model of the LED driver chip is LP8861-Q1. The controlled end of the LED driver chip is connected to the PWM signal output end of the main control module 1, the signal output end is connected to the input end of the main control module 1, the power input end of the LED driver chip is connected to the output end of the switch module 4, the positive output end is connected to the anode of the first diode, the first end of the first inductor is connected to the output end of the switch module 4, and the second end is connected to the anode of the first diode. The cathode of the first diode is connected to the positive pole of the backlight interface in the display interface, and the negative pole of the backlight interface in the display interface is connected to the negative input end of the LED driver chip.

[0029] It should be noted that if Figure 3 As shown, the model of LED driver chip U2 is LP8861-Q1. The SW port of LED driver chip U2 is the positive output terminal, and OUT1-4 is the negative output terminal. When in use, through the backlight interface in the display interface, the two ends of the backlight LED are connected between the positive and negative output terminals to form a power-on loop to light up the LED display. LP8861-Q1 has a built-in MOS tube, which is connected to the SW port to control its grounding. The PWM port of LED driver chip U2 is the controlled terminal, which receives the PWM signal of the main control module 1 and controls the built-in MOS tube according to the signal, thereby controlling the first inductor L6. It is grounded to control the energy storage and discharge state of the first inductor L6. The first inductor L6 and the LED driver chip U2 form an oscillation, and then the display interface is boosted and output through the first diode D10. By changing the duty cycle of the PWM signal, the output voltage and power of the backlight interface in the display interface can be adjusted, thereby adjusting the brightness. When there is no one near the display screen, the brightness of the display screen is reduced to make it work at low brightness; IN1 is the signal output of the dimming module 5 to the main control module 1. The signal output is used to send the status of the dimming module 5 to the main control module 1, such as the power-on status of the driver chip, the dimming output voltage, etc.

[0030] In one embodiment of the present invention, the dimming module 5 also includes a filter circuit 51 and an indicator circuit 52. The indicator circuit 52 is connected to the LED driver chip and is used to indicate the power-on status of the LED driver chip. The filter circuit 51 includes multiple parallel filter capacitors, and the filter circuit 51 is connected to the cathode of the first diode.

[0031] It should be noted that if Figure 3 As shown, the filtering circuit 51 includes capacitors C73-C76 connected in parallel for output power filtering, and the indicating circuit 52 includes an indicator light LED9. The indicator light LED9 is a red indicator light that lights up when the 3.3V power supply of the LED driver chip U2 is normal.

[0032] In one embodiment of the present invention, the dimming module 5 further includes a voltage feedback circuit 53 , the input end of the voltage feedback circuit 53 is connected to the positive electrode of the backlight interface in the display interface, and the output end is connected to the feedback receiving end of the LED driver chip.

[0033] It should be noted that if Figure 3 As shown, the voltage feedback circuit 53 includes resistors R78 and R79, which are connected in series and set between the positive electrode of the backlight output and the ground. Voltage feedback is obtained by voltage division. The FB pin of the LED driver chip U2 can obtain the output voltage feedback by obtaining the terminal voltage of the resistor R78.

[0034] In one embodiment of the present invention, the display screen further includes a storage module 7 , which is connected to the main control module 1 and is used to store image information for display.

[0035] It should be noted that the image information of the advertisement to be displayed can be stored through the storage module 7. After the main control module 1 reads the information, it transmits the image information through the display interface so that the display screen displays it.

[0036] In one embodiment of the present invention, the display screen further includes an Internet of Things module 6 , which is connected to the main control module 1 and is used for remote control of the display screen.

[0037] It should be noted that, through the Internet of Things module 6, the user can remotely control the display screen and remotely transmit image information, which is received by the main control module 1 through the Internet of Things module 6 and stored in the storage module 7 for adjusting the displayed image.

[0038] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A display screen with self-adjusting brightness, characterized in that: include: A main control module (1), a power module (2), a switch module (4), a dimming module (5) and an infrared sensing module (3), wherein the input end of the power module (2) is connected to an external power supply, and the output end supplies power to the main control module (1) and the infrared sensing module (3); the infrared sensing module (3) is connected to the main control module (1) to transmit detected personnel information to the main control module (1); the input end of the switch module (4) is connected to the output end of the power module (2), the controlled end is connected to the main control module (1), and the output end is connected to the input end of the dimming module (5) to supply power to the dimming module (5); the controlled end of the dimming module (5) is connected to the PWM output end of the main control module (1), and the output end is connected to the backlight interface of the display interface to adjust the brightness of the display screen according to the PWM signal of the main control module (1).

2. The display screen with self-adjusting brightness according to claim 1, characterized in that: The power supply module (2) comprises a rectifier circuit and a voltage conversion circuit; the input end of the rectifier circuit is connected to an external power supply, and the output end is connected to the voltage conversion circuit.

3. The display screen with self-adjusting brightness according to claim 1, characterized in that: The switch module (4) comprises a first MOS transistor and a second MOS transistor, wherein the gate of the first MOS transistor is connected to the PWM output end of the main control module (1) via a first resistor, the source is grounded, and the drain is connected to the gate of the second MOS transistor, the source of the second MOS transistor is connected to the output end of the power module (2), and the drain is connected to the input end of the dimming module (5).

4. The display screen with self-adjusting brightness according to claim 3, characterized in that: The dimming module (5) comprises an LED driver chip, a first inductor and a first diode. The model of the LED driver chip is LP8861-Q1. The controlled end of the LED driver chip is connected to the PWM signal output end of the main control module (1), the signal output end is connected to the input end of the main control module (1), the power input end of the LED driver chip is connected to the output end of the switch module (4), the positive output end is connected to the anode of the first diode, the first end of the first inductor is connected to the output end of the switch module (4), the second end is connected to the anode of the first diode, the cathode of the first diode is connected to the positive pole of the backlight interface in the display interface, and the negative pole of the backlight interface in the display interface is connected to the negative input end of the LED driver chip.

5. The display screen with self-adjusting brightness according to claim 4, characterized in that: The dimming module (5) further comprises a filter circuit (51) and an indicator circuit (52); the indicator circuit (52) is connected to the LED driver chip and is used to indicate the power-on state of the LED driver chip; the filter circuit (51) comprises a plurality of filter capacitors connected in parallel; and the filter circuit (51) is connected to the cathode of the first diode.

6. The display screen with self-adjusting brightness according to claim 5, characterized in that: The dimming module (5) further comprises a voltage feedback circuit (53), wherein the input end of the voltage feedback circuit (53) is connected to the positive electrode of the backlight interface in the display interface, and the output end is connected to the feedback receiving end of the LED driver chip.

7. The display screen with self-adjusting brightness according to claim 1, characterized in that: It also includes a storage module (7), which is connected to the main control module (1) and is used to store image information for display.

8. The display screen with self-adjusting brightness according to claim 1, characterized in that: It also includes an Internet of Things module (6), which is connected to the main control module (1) and is used for remote control of the display screen.

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