CN113382500A - Backlight constant brightness control system - Google Patents
Backlight constant brightness control system Download PDFInfo
- Publication number
- CN113382500A CN113382500A CN202110633963.5A CN202110633963A CN113382500A CN 113382500 A CN113382500 A CN 113382500A CN 202110633963 A CN202110633963 A CN 202110633963A CN 113382500 A CN113382500 A CN 113382500A
- Authority
- CN
- China
- Prior art keywords
- brightness
- led lamp
- backlight
- control
- amplifier
- 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
- 238000012790 confirmation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/12—Controlling the intensity of the light using optical feedback
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The application relates to a backlight constant brightness control system, which is technically characterized by comprising a control panel, wherein a brightness negative feedback control circuit for controlling the brightness of an LED to be constant is arranged in the control panel; the LED board is connected with the control board and controls the light-emitting and lighting actions of a plurality of LEDs on the LED board by the control board; the sensor is connected with the control board and used for detecting the actual brightness of the LED board and converting the brightness into an electric signal to be input into the brightness feedback control circuit; the brightness negative feedback control circuit comprises a PID controller, and the PID controller is used for comparing the actual brightness detected by the sensor with the set brightness of the control panel so as to output a stable control brightness signal. The backlight module has the advantage of stabilizing the backlight effect.
Description
Technical Field
The invention relates to the field of liquid crystal display detection equipment, in particular to a backlight constant brightness control system.
Background
Need use in the liquid crystal display production process and be shaded and examine test table and detect the quality of product, and be provided with the LED lamp plate in the test table in a poor light, in order to guarantee liquid crystal display detection effect, need make the LED lamp luminance on the LED lamp plate remain stable. The brightness of the LED lamp is easily affected by many factors such as temperature and lighting time, and the brightness of the LED lamp is usually measured by a luminance meter and then manually adjusted to a proper brightness by an existing worker to keep the brightness of the LED lamp constant, so that the brightness of the LED lamp is inconvenient to adjust.
Disclosure of Invention
In order to keep the brightness of the LED lamp constant, the application provides a backlight constant brightness control system.
The application provides the following technical scheme: a backlight constant brightness control system comprising:
the LED lamp panel is used for controlling the LED lamp to emit light;
the control panel is electrically connected with the LED lamp panel and is used for controlling the brightness of the LED lamp;
the brightness sensor is used for detecting the actual brightness of the LED lamp;
the control panel comprises a brightness negative feedback control circuit, and the brightness negative feedback control circuit is used for controlling the constant brightness of the LED lamp; the brightness negative feedback control circuit comprises a PID controller, and the PID controller is used for comparing the actual brightness detected by the brightness sensor with the set brightness of the control panel so as to output a stable control brightness signal.
Through adopting above-mentioned technical scheme, the control panel sets for the luminance of LED lamp, detects the actual luminance through luminance sensor, and the PID controller detects the actual luminance of comparison LED lamp and sets for luminance to export for the stable control signal of control panel, thereby keep the LED lamp constant luminance.
Preferably, the brightness negative feedback control circuit further includes a first amplifier and a second amplifier, an input terminal of the first amplifier is coupled to the output terminal of the PID controller, an output terminal of the first amplifier is coupled to the control board, an input terminal of the second amplifier is coupled to the output terminal of the brightness sensor, and an output terminal of the second amplifier is coupled to the input terminal of the PID controller.
By adopting the technical scheme, the detection signal and the output signal are amplified through the first amplifier and the second amplifier, so that the accuracy of signal control is improved.
Preferably, still include the platform of being shaded, the LED lamp plate sets up in the platform of being shaded, luminance sensor sets up at the platform lateral wall of being shaded.
By adopting the technical scheme, the brightness sensor is arranged on the side wall of the backlight platform, so that the detection of the backlight platform on the liquid crystal screen is prevented from being influenced.
Preferably, a display nixie tube for displaying the brightness of the LED is arranged on the control panel, and the input button and the disturbance button are connected to the display nixie tube.
Through adopting above-mentioned technical scheme, the charactron is connected and is used for showing LED's luminance numerical value on the control panel, makes things convenient for personnel to the adjustment action of LED lamp luminance on the LED lamp plate.
Preferably, the control panel is provided with a position selection key and a setting/setting confirmation key which are coupled with the display nixie tube.
Through adopting above-mentioned technical scheme, coupling is used for selecting the demonstration position of charactron in the position selection key of charactron on the control panel, promotes the accuracy that LED lamp luminance set up.
Preferably, the control panel is provided with a backlight interface connected to the backlight of the LED lamp panel and a backlight switch interface, and the backlight switch interface is externally connected with a switch.
Through adopting above-mentioned technical scheme, the security that the switch is connected is used for guaranteeing in the external setting of switch interface in a poor light on the control panel, guarantees that the switch stops the control effect of action to opening in a poor light, conveniently in time changes the switch when needs.
Preferably, a power interface is arranged on the control panel, and the power interface line is connected with a power adapter.
By adopting the technical scheme, the power adapter connected to the control board is used for ensuring the normal operation of the control board and the connected electronic devices, so that the influence of unstable voltage on the use safety of the control board and the connected electronic devices such as the LED board is avoided, and the safety performance of power utilization is improved.
Compared with the prior art, the invention has the beneficial effects that:
the control panel sets for the luminance of LED lamp, detects the actual luminance of LED lamp through luminance sensor, and the PID controller detects the actual luminance of comparison LED lamp and sets for luminance to the stable control signal of control panel is given in the output, thereby keeps LED lamp constant luminance.
Drawings
FIG. 1 is a schematic circuit diagram of a backlight control system according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a connection structure of a backlight and a control board in the embodiment of the present application.
Reference numerals: 1. a backlight stage; 2. an LED lamp panel; 3. a diffusion sheet; 4. a control panel; 5. a brightness sensor; 6. a brightness negative feedback control circuit; 7. a PID controller; 8. a first amplifier; 9. a second amplifier; 10. displaying the nixie tube; 11. a bit selection key; 12. set/set up confirm key; 13. a power interface; 14. a backlight interface; 15. a backlight switch interface.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
Referring to fig. 1 and 2, an embodiment of the present application discloses a backlight constant brightness control system. The LED lamp comprises a backlight platform 1, wherein an LED lamp panel 2 is horizontally arranged in the backlight platform 1, and the LED lamp panel 2 is used for controlling an LED lamp to emit light. The surface of the backlight platform 1 above the LED lamp panel 2 is provided with a diffusion sheet 3, and the light of the LED lamp is uniformly diffused through the diffusion sheet 3, so that the detection effect of the backlight on the liquid crystal screen is improved.
The LED lamp panel 2 is electrically connected with a control panel 4, and the control panel 4 is used for controlling the brightness of the LED lamp; a brightness sensor 5 is arranged on the side wall of the backlight platform 1, and the brightness sensor 5 is used for detecting the actual brightness of the LED lamp; the control panel 4 comprises a brightness negative feedback control circuit 6, and the brightness negative feedback control circuit 6 is used for controlling the constant brightness of the LED lamp; the luminance negative feedback control circuit 6 includes a PID controller 7, and the PID controller 7 is used for comparing the actual light-emitting luminance detected by the luminance sensor 5 with the set luminance of the control board 4 to output a stable control luminance signal. The control panel 4 sets for the luminance of LED lamp, detects the actual luminance of LED lamp through luminance sensor 5, and PID controller 7 detects the actual luminance of comparison LED lamp and sets for luminance to output the stable control signal of control panel 4, thereby keep LED lamp constant luminance.
The brightness negative feedback control circuit 6 further includes a first amplifier 8 and a second amplifier 9, an input terminal of the first amplifier 8 is coupled to an output terminal of the PID controller 7, an output terminal of the first amplifier 8 is coupled to the control board 4, an input terminal of the second amplifier 9 is coupled to an output terminal of the brightness sensor 5, and an output terminal thereof is coupled to an input terminal of the PID controller 7. The detection signal and the output signal are amplified by the first amplifier 8 and the second amplifier 9, thereby improving the accuracy of signal control. The first amplifier 8 and the second amplifier 9 are both RGB amplifiers. The control formula of the PID controller 7 is: PID controller 7 function = amplification of first amplifier 8 PID (LED lamp brightness setpoint-amplification of second amplifier 9 LED lamp actual brightness value).
The control panel 4 is provided with a display nixie tube 10 for displaying the brightness of the LED, so that the personnel can conveniently adjust the brightness of the LED lamp on the LED lamp panel 2. The control panel 4 is provided with a bit selection key 11 and a setting/setting confirmation key 12 coupled to the display nixie tube 10. The control panel 4 is coupled to a position selection key 11 of the nixie tube and used for selecting the display position of the nixie tube, and the accuracy of the brightness setting of the LED lamp is improved. The control panel 4 is provided with a backlight interface 14 connected to the backlight of the LED lamp panel 2 and a backlight switch interface 15, and the backlight switch interface 15 is externally connected with a switch. The external setting of the backlight switch interface 15 on the control panel 4 is used for ensuring the safety of switch connection, ensuring the control effect of the switch on and off actions of the backlight, and facilitating the timely replacement of the switch when needed.
The control panel 4 is provided with a power interface 13, and the power interface 13 is connected with a power adapter through a wire. The power adapter connected to the control board 4 is used for ensuring normal operation of the control board 4 and the connected electronic devices, so that influence on the use safety of the control board 4 and the connected electronic devices such as the LED board due to unstable voltage is avoided, and the safety performance of power utilization is improved.
The implementation principle of the embodiment of the application is as follows: the control panel 4 sets for the luminance of LED lamp, detects the actual luminance of LED lamp through luminance sensor 5, and PID controller 7 detects the actual luminance of comparison LED lamp and sets for luminance to output the stable control signal of control panel 4, thereby keep LED lamp constant luminance.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A backlight constant brightness control system, comprising:
the LED lamp panel (2), the LED lamp panel (2) is used for controlling the LED lamp to emit light;
the control panel (4) is electrically connected with the LED lamp panel (2) and is used for controlling the brightness of the LED lamp;
the brightness sensor (5), the said brightness sensor (5) is used for detecting the actual luminance of LED lamp;
the control panel (4) comprises a brightness negative feedback control circuit (6), and the brightness negative feedback control circuit (6) is used for controlling the constant brightness of the LED lamp; the brightness negative feedback control circuit (6) comprises a PID controller (7), and the PID controller (7) is used for comparing the actual brightness detected by the brightness sensor (5) with the set brightness of the control panel (4) so as to output a stable control brightness signal.
2. The backlight constant brightness control system according to claim 1, wherein: the brightness negative feedback control circuit (6) further comprises a first amplifier (8) and a second amplifier (9), wherein an input end of the first amplifier (8) is coupled to an output end of the PID controller (7), an output end of the first amplifier (8) is coupled to the control board (4), an input end of the second amplifier (9) is coupled to an output end of the brightness sensor (5), and an output end of the second amplifier is coupled to an input end of the PID controller (7).
3. The backlight constant brightness control system according to claim 1, wherein: still including platform (1) in a poor light, LED lamp plate (2) set up in platform (1) in a poor light, luminance sensor (5) set up at platform (1) lateral wall in a poor light.
4. The backlight constant brightness control system according to claim 2, wherein: and a display nixie tube (10) for displaying the brightness of the LED lamp is arranged on the control panel (4).
5. A backlight constant brightness control system according to claim 3, characterized in that: the control panel (4) is provided with a position selection key (11) coupled with the display nixie tube (10) and a setting/setting confirmation key (12).
6. The backlight constant brightness control system according to claim 1, wherein: be provided with on control panel (4) and connect in LED lamp plate (2) backlight interface (14) and the switch interface (15) that is shaded, switch interface (15) are shaded externally has the switch.
7. The backlight constant brightness control system according to claim 1, wherein: the control panel (4) is provided with a power interface (13), and the power interface (13) is connected with a power adapter through a wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110633963.5A CN113382500A (en) | 2021-06-07 | 2021-06-07 | Backlight constant brightness control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110633963.5A CN113382500A (en) | 2021-06-07 | 2021-06-07 | Backlight constant brightness control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113382500A true CN113382500A (en) | 2021-09-10 |
Family
ID=77576169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110633963.5A Pending CN113382500A (en) | 2021-06-07 | 2021-06-07 | Backlight constant brightness control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113382500A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116206570A (en) * | 2021-11-30 | 2023-06-02 | 北京讯通安添通讯科技有限公司 | Screen backlight brightness adjusting method and adjusting system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1655024A (en) * | 2004-02-09 | 2005-08-17 | 株式会社日立显示器 | Liquid crystal display device |
| US20060221047A1 (en) * | 2005-03-30 | 2006-10-05 | Nec Display Solutions, Ltd. | Liquid crystal display device |
| CN2828858Y (en) * | 2005-09-15 | 2006-10-18 | 比亚迪股份有限公司 | Testing device for liquid crystal mould set of stable back-light brightness |
| CN101161036A (en) * | 2005-04-18 | 2008-04-09 | 罗姆股份有限公司 | Lighting device and display device using same |
| CN101290430A (en) * | 2007-04-17 | 2008-10-22 | Lg.菲利浦Lcd株式会社 | Backlight unit and display device having the same |
| CN101384114A (en) * | 2007-09-07 | 2009-03-11 | 比亚迪股份有限公司 | Light source control system and light source box |
| CN101882412A (en) * | 2009-05-06 | 2010-11-10 | 奇菱科技股份有限公司 | Flat panel display and detection and correction system of same |
| CN202652649U (en) * | 2012-06-21 | 2013-01-02 | 艾礼富电子(深圳)有限公司 | LED dimming energy-saving sensor |
| CN203492230U (en) * | 2013-09-16 | 2014-03-19 | 成都昊地科技有限责任公司 | An automatic brightness control circuit for an LED lamp |
-
2021
- 2021-06-07 CN CN202110633963.5A patent/CN113382500A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1655024A (en) * | 2004-02-09 | 2005-08-17 | 株式会社日立显示器 | Liquid crystal display device |
| US20060221047A1 (en) * | 2005-03-30 | 2006-10-05 | Nec Display Solutions, Ltd. | Liquid crystal display device |
| CN101161036A (en) * | 2005-04-18 | 2008-04-09 | 罗姆股份有限公司 | Lighting device and display device using same |
| CN2828858Y (en) * | 2005-09-15 | 2006-10-18 | 比亚迪股份有限公司 | Testing device for liquid crystal mould set of stable back-light brightness |
| CN101290430A (en) * | 2007-04-17 | 2008-10-22 | Lg.菲利浦Lcd株式会社 | Backlight unit and display device having the same |
| CN101384114A (en) * | 2007-09-07 | 2009-03-11 | 比亚迪股份有限公司 | Light source control system and light source box |
| CN101882412A (en) * | 2009-05-06 | 2010-11-10 | 奇菱科技股份有限公司 | Flat panel display and detection and correction system of same |
| CN202652649U (en) * | 2012-06-21 | 2013-01-02 | 艾礼富电子(深圳)有限公司 | LED dimming energy-saving sensor |
| CN203492230U (en) * | 2013-09-16 | 2014-03-19 | 成都昊地科技有限责任公司 | An automatic brightness control circuit for an LED lamp |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116206570A (en) * | 2021-11-30 | 2023-06-02 | 北京讯通安添通讯科技有限公司 | Screen backlight brightness adjusting method and adjusting system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100578302C (en) | Display device and driving device for light source | |
| CN103198809B (en) | LED (Light Emitting Diode) backlight source and liquid-crystal display equipment | |
| CN106875889A (en) | Electroluminescence display panel, its driving method, its drive device and display device | |
| CN113382500A (en) | Backlight constant brightness control system | |
| CN103313459A (en) | Control device for indicating lamp | |
| KR20040063033A (en) | Apparatus and method for display | |
| KR20070050815A (en) | Device for driving a light source module | |
| WO2009158427A1 (en) | Methods and circuits for self-calibrating controller | |
| CN106708145B (en) | Multichannel power supply circuit | |
| CN101931551A (en) | System and method for managing server | |
| CN101604507B (en) | LCD and backlight unit brightness automatic constant circuit thereof | |
| CN201118796Y (en) | Under voltage protection circuit | |
| US20070159117A1 (en) | Backlight module control circuit of multi-lamp display device | |
| CN104950239A (en) | Backlight driving detection circuit | |
| KR20100024284A (en) | Driving circuit for back-light unit having reset function | |
| CN208922489U (en) | Control device for ship navigation signal lamp | |
| KR100357148B1 (en) | Apparatus for compensating brightness of LCD monitor | |
| CN210604869U (en) | Wire rod pin detection circuit and wire rod pin detection system | |
| US20080001552A1 (en) | Input current limiting circuit and driving device using the same | |
| CN210864413U (en) | State detection device and circuit of industrial control board and PCB (printed circuit board) thereof | |
| KR20030075572A (en) | Automatic test system for lcd inverter | |
| CN201515534U (en) | Backlight drive current balance device | |
| KR100577790B1 (en) | Error detection system of backlight unit in liquid crystal display | |
| CN208173199U (en) | A kind of LCD liquid crystal board display screen detecting instrument suitable for a variety of operating voltages | |
| CN218107728U (en) | Operation panel of intelligent illuminance data acquisition application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |