CN216212268U - Screen brightness automatic regulating structure - Google Patents
Screen brightness automatic regulating structure Download PDFInfo
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- CN216212268U CN216212268U CN202121137508.8U CN202121137508U CN216212268U CN 216212268 U CN216212268 U CN 216212268U CN 202121137508 U CN202121137508 U CN 202121137508U CN 216212268 U CN216212268 U CN 216212268U
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Abstract
The utility model relates to an automatic screen brightness adjusting structure which comprises an ambient light collecting module, a backlight module and a control module, wherein the ambient light collecting module is used for collecting ambient brightness signals of a screen, the backlight module is used for providing backlight brightness, the control module is used for controlling the operation of the ambient light collecting module and the backlight module, so that the ambient light collecting module and the backlight module work in a time-sharing mode under the control of a PWM (pulse width modulation) driving circuit, the backlight actually works intermittently, the ambient light collecting module works when the backlight module is not conducted to collect ambient light, and the interference of the backlight to light collection is avoided.
Description
Technical Field
The utility model relates to the technical field of electronic screens, in particular to an automatic screen brightness adjusting structure.
Background
Flat panel displays, such as liquid crystal displays, plasma displays, and the like, are becoming increasingly popular in our lives and works today. In order to protect the eyes from damage due to low or high brightness of the display screen and to save power, many displays are provided with circuits or devices that automatically adjust the brightness of the screen in response to ambient light, and in general, such devices typically include a sensor for sensing the ambient brightness at the location and then providing the ambient brightness to a screen brightness controller. The screen brightness controller automatically adjusts the brightness of the display screen according to the ambient brightness.
However, in the conventional screen brightness adjustment, the interference of screen backlight on the light collection module needs to be noticed during installation, so that the structure of the screen is limited, the brightness adjustment is inaccurate, and the user experience is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: the screen brightness automatic adjusting structure is provided, so that light collection is not influenced by backlight, and interference between the light collection and the backlight is avoided.
The utility model specifically adopts the following technical scheme for realizing the purpose:
an automatic screen brightness adjusting structure is characterized by comprising an ambient light collecting module, a backlight module and a control module;
the ambient light acquisition module is used for acquiring brightness signals around the screen;
the backlight module is used for providing backlight brightness;
the control module is used for controlling the operation of the ambient light acquisition module and the backlight module;
the ambient light collection module includes resistance R74, resistance R75, resistance R76 and phototriode, the projecting pole of phototriode with resistance R74 connects the back ground connection, the collecting electrode of phototriode with resistance R76 connects the back and is connected with the power phototriode with connect between the resistance R74 resistance R75, resistance R75's the other end is connected with digital-to-analog conversion chip ADC IC.
Through the scheme, the ambient light signal is collected through the ambient light collection module, the backlight module is used for certain illumination, the control module controls the conduction of the ambient light collection module and the backlight module, the ambient light collection module and the backlight module work in a time-sharing mode, the ambient light collection module and the backlight module do not interfere with each other, the ambient light is sampled through the phototriode, and meanwhile the conduction of the phototriode is controlled through the control module.
Further, the backlight module includes a resistor R37, a resistor R38, a resistor R39, a triode Q2 and a backlight LED lamp, a collector of the triode Q2 is connected with the resistor R37, the other end of the resistor R37 is connected with the backlight LED lamp, the other end of the backlight LED lamp is connected with a power supply, an emitter of the triode Q2 is grounded, a resistor R39 is connected between a base and the emitter of the triode Q2, the base of the triode Q2 is connected with the resistor R38, the other end of the resistor R38 is connected with the digital-to-analog conversion chip ADC IC, and a PWM signal access line is connected between the resistor R38 and the digital-to-analog conversion chip.
According to the scheme, the backlight brightness is provided through the backlight LED lamp, and meanwhile the conduction of the backlight LED lamp is controlled through the control module.
Further, when the PWM driving circuit is at a high potential, the backlight LED lamp is turned on, and when the PWM driving circuit is at a low potential, the phototriode is turned on.
Through above-mentioned scheme, with PWM drive circuit, act as the switch, according to PWM pulse signal's characteristic, the LED lamp in a poor light and conduction of phototriode are controlled, switch on the LED lamp in a poor light when the high potential, switch on the phototriode when the low potential, can let both timesharing work for the phototriode is gathered ambient light when the LED lamp in a poor light is out of work, makes both mutual noninterference, thereby has promoted the degree of accuracy of ambient light sampling.
The utility model has the following beneficial effects:
1. the backlight module is connected with the PWM driving circuit, the backlight module is connected with the backlight module, and the backlight module is connected with the PWM driving circuit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a PWM control signal diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1 to 2, the present invention discloses an automatic screen brightness adjusting structure, which comprises an ambient light collecting module, a backlight module and a control module; the environment light acquisition module is used for acquiring environment light signals, the backlight module is used for lighting to a certain degree, and the control module is used for controlling the conduction of the environment light acquisition module and the backlight module, so that the environment light acquisition module and the backlight module work in a time-sharing mode and do not interfere with each other.
The ambient light collection module includes resistance R74, resistance R75, resistance R76 and phototriode, the projecting pole of phototriode with resistance R74 connects the back ground connection, the collecting electrode of phototriode with resistance R76 connects the back and is connected with the power phototriode with connect between the resistance R74 resistance R75, resistance R75's the other end is connected with digital-to-analog conversion chip ADC IC for gather screen ambient brightness signal, sample the ambient light through phototriode, switch on through control module control phototriode simultaneously.
The backlight module comprises a backlight LED lamp, one end of the backlight LED lamp is grounded, and the other end of the backlight LED lamp is connected with the control module and used for providing backlight brightness; the backlight LED lamp is used for providing backlight brightness, and meanwhile, the control module is used for controlling the conduction of the backlight LED lamp.
The backlight module comprises a resistor R37, a resistor R38, a resistor R39, a triode Q2 and a backlight LED lamp, wherein a collector of the triode Q2 is connected with the resistor R37, the other end of the resistor R37 is connected with the backlight LED lamp, the other end of the backlight LED lamp is connected with a power supply, an emitter of the triode Q2 is grounded, a resistor R39 is connected between a base level and an emitter of the triode Q2, the base level of the triode Q2 is connected with the resistor R38, the other end of the resistor R38 is connected with a digital-to-analog conversion chip ADC IC, a PWM signal access line is connected between the resistor R38 and the digital-to-analog conversion chip, the backlight LED lamp is conducted when the PWM driving circuit is at a high potential, and the triode is conducted to control the operation of the ambient light collection module and the backlight module when the PWM driving circuit is at a low potential.
With PWM drive circuit, act as the switch, according to PWM pulse signal's characteristic, the switching on of LED lamp and phototriode in a poor light is controlled, switches on LED lamp in a poor light when the high potential, switches on phototriode when the low potential, can let both timesharing work for phototriode gathers ambient light when LED lamp is out of work in a poor light, makes both mutual noninterference, thereby has promoted the degree of accuracy of ambient light sampling.
The working principle is as follows: the ambient light acquisition circuit and the backlight circuit are jointly connected with the same control signal, the backlight control circuit is turned on when the control signal is at a high level, the LED emits light, and is turned off when the control signal is at a low level, and the LED does not emit light; ADC acquisition circuit is out of work when control signal high level, starts to gather ambient light data when control signal is the low level, so when having LED light brightness control and ambient light to gather in the equipment simultaneously, work each other and be in timesharing operating condition, and LED is luminous not influence ambient light and gathers.
Claims (3)
1. An automatic screen brightness adjusting structure is characterized by comprising an ambient light collecting module, a backlight module and a control module;
the ambient light acquisition module is used for acquiring brightness signals around the screen;
the backlight module is used for providing backlight brightness;
the control module is used for controlling the operation of the ambient light acquisition module and the backlight module;
the ambient light collection module includes resistance R74, resistance R75, resistance R76 and phototriode, the projecting pole of phototriode with resistance R74 connects the back ground connection, the collecting electrode of phototriode with resistance R76 connects the back and is connected with the power phototriode with connect between the resistance R74 resistance R75, resistance R75's the other end is connected with digital-to-analog conversion chip ADC IC.
2. The automatic screen brightness adjusting structure of claim 1, wherein the backlight module comprises a resistor R37, a resistor R38, a resistor R39, a transistor Q2 and a backlight LED lamp, a collector of the transistor Q2 is connected to the resistor R37, another end of the resistor R37 is connected to the backlight LED lamp, another end of the backlight LED lamp is connected to a power supply, an emitter of the transistor Q2 is grounded, a resistor R39 is connected between a base and an emitter of the transistor Q2, the base of the transistor Q2 is connected to the resistor R38, another end of the resistor R38 is connected to the digital-to-analog converter ADC IC, and a PWM signal access line is connected between the resistor R38 and the digital-to-analog converter.
3. The automatic screen brightness adjusting structure according to claim 2, wherein the backlight LED lamp is turned on when the PWM driving circuit is at a high potential, and the phototriode is turned on when the PWM driving circuit is at a low potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121137508.8U CN216212268U (en) | 2021-05-25 | 2021-05-25 | Screen brightness automatic regulating structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121137508.8U CN216212268U (en) | 2021-05-25 | 2021-05-25 | Screen brightness automatic regulating structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216212268U true CN216212268U (en) | 2022-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121137508.8U Active CN216212268U (en) | 2021-05-25 | 2021-05-25 | Screen brightness automatic regulating structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216212268U (en) |
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2021
- 2021-05-25 CN CN202121137508.8U patent/CN216212268U/en active Active
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