CN106531094A - Control system for electronic advertisement screen - Google Patents
Control system for electronic advertisement screen Download PDFInfo
- Publication number
- CN106531094A CN106531094A CN201611062753.0A CN201611062753A CN106531094A CN 106531094 A CN106531094 A CN 106531094A CN 201611062753 A CN201611062753 A CN 201611062753A CN 106531094 A CN106531094 A CN 106531094A
- Authority
- CN
- China
- Prior art keywords
- brightness
- control system
- advertisement screen
- led
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The invention discloses a control system for an electronic advertisement screen. The electronic advertisement screen comprises a liquid crystal display panel and an LED backlight. The control system comprises a control unit, a brightness detection unit and an LED driving unit, wherein the brightness detection unit adopts two photoelectric sensors which are respectively used for detecting the ambient brightness and the LED backlight brightness, the brightness detection unit and the control unit are connected through a filtering and amplifying circuit, the control unit is connected with the LED driving unit, and the LED driving unit performs adjustment on the LED backlight brightness. The control system realizes automatic adjustment for the background lighting intensity through acquiring the ambient light intensity, the background lighting intensity and the environment temperature in real time, and enables the brightness of a liquid crystal display to keep consistent with the ambient brightness, thereby achieving an excellent visual effect and an effect of environmental protection and energy conservation.
Description
Technical field
The present invention relates to a kind of electric advertisement screen control system.
Background technology
Increasingly mature with large scale liquid crystal panel technology, traditional page ad mode is just gradually being used liquid crystal surface
The electric advertisement screen of plate is replaced, and liquid crystal panel background illumination mainly adopts cathode fluorescent tube and White-light LED illumination, and
LED backlight is shown in each field with advantages such as its luminous efficiency height, little, reliability and durability energy consumption, long service life, environmental protections
Application on product is more and more extensive.With the continuous maturation of LED-backlit technology, people are also constantly changing to its performance
Enter, allow LED-backlit technology to perform to the benefit of its maximum.
The content of the invention
It is an object of the invention to provide a kind of electric advertisement screen control system, can be according to environment and background illumination and environment
The situation of temperature, automatically adjusts the background illumination intensity of electronic display, and the brightness and ambient brightness for making LCDs keeps
Unanimously.
For solving above-mentioned technical problem, a kind of electric advertisement screen control system, the electric advertisement screen is present invention employs
Including liquid crystal panel and LED backlight, the control system includes control unit, brightness detection unit and LED drive unit, institute
State brightness detection unit to be respectively used to detect ambient brightness and LED backlight brightness, brightness detection using two photoelectric sensors
It is attached by filter amplification circuit between unit and control unit, described control unit connection LED drive unit, LED are driven
Moving cell is adjusted to LED backlight brightness.
Described control unit is the system constituted using STM32F030F4 microcontrollers and its peripheral circuit.
The brightness detection unit adopts BPW21 photoelectric sensors.
The LED drive unit is the backlight source driving circuit using LTM3598 chips.
The present invention passes through Real-time Collection environmental light intensity and background illumination light intensity and ambient temperature, realizes to background illumination intensity
Automatically adjust, the brightness and ambient brightness for making LCDs is consistent, so as to play good visual effect and environmental protection
The effect of energy-conservation.
Description of the drawings
Fig. 1 is present system structured flowchart.
Fig. 2 is LED drive unit circuit diagram of the present invention.
Specific embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1, a kind of electric advertisement screen control system in the present embodiment, the electric advertisement screen include liquid crystal panel and
LED backlight, the control system include control unit, brightness detection unit and LED drive unit, the brightness detection unit
It is respectively used to detect ambient brightness and LED backlight brightness, brightness detection unit and control unit using two photoelectric sensors
Between be attached by filter amplification circuit, described control unit connection LED drive unit, LED drive unit is to LED-backlit
Source brightness is adjusted.
Control system gathers ambient brightness and back light source brightness respectively using two photoelectric sensors, puts respectively through filtering
The A/D interfaces of control unit are accessed after big, and control unit gathers ambient temperature by temperature sensor, according to the parameter control of collection
Element analysises processed simultaneously calculate the dutycycle of output and drive backlight driver unit to change the size of current for flowing through backlight LED, from
And realize the closed loop control of backlight LED brightness.
Control unit is the system constituted using STM32F030F4 microcontrollers and its peripheral circuit.Ambient brightness is adopted
Photoelectric sensor BPW21 is measured, and environmental light brightness can be converted into current signal by BPW21, under conditions of complete darkness
Be output as 2nA, its ambient brightness sensing range be 0 to 5000lx, maximum by LM324 output maximum determine.Photoelectric sensing
Device BPW21 is acquired to ambient brightness, and after collection, the filtered amplifying circuit of signal sends into the microcontroller of control unit after processing
Changed in A/D inside device STM32F030F4.
System carries out data acquisition using a photoelectric sensor BPW21 to LED luminous sources luminosity in addition, will collection
After data are filtered processing and amplifying, then A/D conversions are carried out, the data of collection and reference value are compared, are seen by control unit
Difference is whether there is, is had, then be controlled, without then continuing to keep, wait subsequent cycle.Setting value is previous moment ambient brightness pair
The binary number answered, the corresponding binary number of LED backlight brightness are actual value, by both differences, draw control unit control
The foundation of system, and then control PWM ripple dutycycles.
LED drive unit adopts backlight driver chip LT3598, the PWM ripples that reception control unit sends during work, root
The size of output current is determined according to the dutycycle size of PWM ripples；LT3598 has six driving mouths, and two drive mouth to drive a string
The LED lamp bar of 10.As Fig. 2 be LED drive circuit of the present invention, system using control PWM ripples form control electric current size
To be adjusted to the luminosity of LED.
The control principle of control system of the present invention is：External environment brightness is gathered by optical sensor, signal is put
It is big to process, then analog digital conversion feeding microcontroller is carried out, microcontroller sends the luminous of corresponding PWM ripples control LED
Brightness.By Real-time Collection environmental light intensity and background illumination light intensity and ambient temperature, the automatic tune to background illumination intensity is realized
Section, the brightness and ambient brightness for making LCDs is consistent, so as to play the effect of good visual effect and environmental protection and energy saving
Really.
The present invention specification and drawings be considered as it is illustrative and not restrictive, on the basis of the present invention, ability
Field technique personnel are according to disclosed technology contents, it is not necessary to which performing creative labour just can be made to some of them technical characteristic
Some are replaced and deform, within the scope of the present invention.
Claims (4)
1. electric advertisement screen control system, the electric advertisement screen include liquid crystal panel and LED backlight, it is characterised in that：Institute
Stating control system includes control unit, brightness detection unit and LED drive unit, and the brightness detection unit adopts two photoelectricity
Sensor is respectively used to detect ambient brightness and LED backlight brightness, by filtering between brightness detection unit and control unit
Amplifying circuit is attached, and described control unit connection LED drive unit, LED drive unit are adjusted to LED backlight brightness
Section.
2. electric advertisement screen control system according to claim 1, it is characterised in that：Described control unit is employing
The system of STM32F030F4 microcontrollers and its peripheral circuit composition.
3. electric advertisement screen control system according to claim 1, it is characterised in that：The brightness detection unit is adopted
BPW21 photoelectric sensors.
4. electric advertisement screen control system according to claim 1, it is characterised in that：The LED drive unit is employing
The backlight source driving circuit of LTM3598 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611062753.0A CN106531094A (en) | 2016-11-28 | 2016-11-28 | Control system for electronic advertisement screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611062753.0A CN106531094A (en) | 2016-11-28 | 2016-11-28 | Control system for electronic advertisement screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106531094A true CN106531094A (en) | 2017-03-22 |
Family
ID=58357507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611062753.0A Pending CN106531094A (en) | 2016-11-28 | 2016-11-28 | Control system for electronic advertisement screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106531094A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019042031A1 (en) * | 2017-08-30 | 2019-03-07 | 深圳市奥拓电子股份有限公司 | Temperature and humidity control panel and led display screen |
| CN111312179A (en) * | 2019-12-09 | 2020-06-19 | Oppo广东移动通信有限公司 | Backlight brightness adjusting method and related product |
-
2016
- 2016-11-28 CN CN201611062753.0A patent/CN106531094A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019042031A1 (en) * | 2017-08-30 | 2019-03-07 | 深圳市奥拓电子股份有限公司 | Temperature and humidity control panel and led display screen |
| CN111312179A (en) * | 2019-12-09 | 2020-06-19 | Oppo广东移动通信有限公司 | Backlight brightness adjusting method and related product |
| CN111312179B (en) * | 2019-12-09 | 2021-05-11 | Oppo广东移动通信有限公司 | Backlight brightness adjusting method and related product |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170322 |