CN103177692A - Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method - Google Patents
Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method Download PDFInfo
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- CN103177692A CN103177692A CN2013101016587A CN201310101658A CN103177692A CN 103177692 A CN103177692 A CN 103177692A CN 2013101016587 A CN2013101016587 A CN 2013101016587A CN 201310101658 A CN201310101658 A CN 201310101658A CN 103177692 A CN103177692 A CN 103177692A
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Abstract
The invention discloses a temperature compensation control circuit for automatically adjusting the color temperature of an LED (Light Emitting Diode) display screen and a control method. The temperature compensation control circuit comprises an LED display module and an LED driver IC (integrated circuit), wherein the LED driver IC is arranged in a power supply circuit of the LED display module and connected with the temperature compensation control circuit, the temperature compensation control circuit comprises a current limiting resistor R, a matching resistor R1 and a thermistor Rt, the matching resistor R1 and the thermistor Rt are connected with each other in parallel, one ends of the matching resistor R1 and the thermistor Rt after parallel connection are connected with the current limiting resistor R in series in a circuit of the LED driver IC, and the other ends are grounded. The temperature compensation control circuit is simple and reliable, and can be used for adjusting white balance of the LED display screen in real time. When the temperature of the display screen module changes, the current of a red LED can be automatically adjusted by the LED driver IC through the thermistor Rt to achieve the consistent color temperature of the LED display screen.
Description
Technical field
The present invention relates to the LED display technical field, especially relate to a kind of automatic adjustment LED display colour temperature temperature compensation control circuit and control method.
Background technology
Along with the development of science and technology, the maturation of LED technology, cost is also significantly descending simultaneously, and LED display is widely used.LED display is that light emitting diode is installed the display device that matrix rearranges, and can show character and image information.Due to the difference of light emitting diode brightness when producing and in use in various degree brightness decay, cause LED display overall brightness colourity inhomogeneous, had a strong impact on the display effect of LED display.In LED display circuit the inside (as shown in Figure 1) in the past, owing to there is no temperature-compensation circuit, LED display because displaying contents is ever-changing, makes the local temperature of LED display impossible the same in work.Cause the local colour temperature of LED display different because temperature is different, last result is that the consistance of LED display is very poor, and is particularly more obvious when the display white picture.It is partially red that its phenomenon shows as some places, the inclined to one side cyan of some places.Existing LED display generally adopts the light emitting diode of red, green, blue three looks to be mixed into the backlight of white, because the characteristic of red LED is that temperature rising brightness meeting descends; And temperature more high brightness descend larger.When using as the LED display field, the brightness due to red LED when temperature raises constantly descends, and makes the red, green, blue proportioning (3:6:1) of LED display constantly change, thereby causes the variation of colour temperature; That red proportioning constantly reduces due to what change, so what show on display screen is that white balance is more and more partially blue or green.At present, some researchists shield body brightness and strengthen IC by reduction to dispel the heat to process, but cost is higher and effect is undesirable.
Summary of the invention
The technical matterss such as the object of the invention is to provide a kind of automatic adjustment LED display colour temperature temperature compensation control circuit and control method, and aberration, the white balance that causes to solve the existing LED display Yin Wendu of prior art is bad.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: automatically adjust LED display colour temperature temperature compensation control circuit, comprise that LED shows module, LED driver IC is provided with LED driver IC in this LED demonstration module current supply circuit; Described LED driver IC is connected with temperature compensation control circuit, and this temperature compensation control circuit comprises current-limiting resistance R, build-out resistor R1 and thermistor Rt; Described build-out resistor R1 and thermistor Rt are in parallel, and after build-out resistor R1 and thermistor Rt parallel connection, an end and current-limiting resistance R are connected in series in the loop of described LED driver IC, other end ground connection.
Principle of work of the present invention is: add temperature-sensitive resistance on LED driver IC, when raising because of LED display module temperature, when this moment, red LED brightness descended, LED driver IC diminishes automatically by the resistance of thermistor, thereby automatically improve red LED electric current, improve red LED luminance balance colour temperature; Otherwise when descending because of LED display module temperature, when red LED brightness raise, LED driver IC reduced the red LED electric current by the automatic increasing of thermistor resistance, thereby reduced the brightness of red LED, reached the purpose of balance colour temperature.
As preferably, described LED driver IC is connected with temperature compensation control circuit, and this temperature-compensation circuit comprises current-limiting resistance R, build-out resistor R1 and thermistor Rt; Described build-out resistor R1 and current-limiting resistance R series connection, in parallel with thermistor Rt after this build-out resistor R1, current-limiting resistance R series connection.
As preferably, described LED driver IC comprises Input voltage terminal, outer meeting resistance end, output terminal, earth terminal, and wherein Input voltage terminal is connected with constant-current source circuit, and the input end of this constant-current source circuit connects power supply; Described outer meeting resistance end is connected with temperature compensation control circuit, and output terminal is connected with red LED by output circuit.
As preferably, described current-limiting resistance R is used for the restriction output current; Thermistor Rt is negative tempperature coefficient thermistor; Build-out resistor R1 is by in parallel with thermistor Rt and adjust red LED brightness.
Automatically adjust the control method of the temperature compensation control circuit of LED display colour temperature, specifically comprise the following steps:
(1), the LED display module powers on, red LED driver IC, green LED driver IC, blue led driver IC start, and light the LED display module according to the default value that arranges;
(2), the temperature compensation control circuit of red LED driver IC connection starts;
(3), current-limiting resistance R limits output current, thermistor Rt reception LED display module temperature;
(4), a.LED shows that the module temperature raises, red LED brightness descends, thermistor Rt resistance reduces, output current increases, the red LED luminance raising;
B. LED shows that the module temperature reduces, the red LED luminance raising, and thermistor Rt resistance increases, and output current reduces, and red LED brightness descends;
(5), that build-out resistor R1 adjusts the change curve of thermistor Rt is consistent with the change curve of red LED brightness, makes LED show module no matter be high temperature or low temperature, its display effect is all consistent.
Circuit of the present invention is simple and reliable, can be real-time complete LED display photochromic consistance backlight, the adjustment of white balance, efficient is high, accuracy is high.When display screen module temperature changed, LED driver IC regulated the electric current of red LED automatically by thermistor Rt, reached the consistent of LED display colour temperature.
Description of drawings
Fig. 1 is existing LED display circuit theory diagrams.
Fig. 2 is the circuit theory diagrams of a kind of preferred embodiment of the present invention.
Fig. 3 is the circuit theory diagrams of another kind of preferred embodiment of the present invention.
Fig. 4 is module schematic diagram of the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is further described in detail.
Fig. 2 is the circuit theory diagrams of a kind of preferred embodiment of the present invention; Fig. 4 is module schematic diagram of the present invention.By Fig. 2 in conjunction with Fig. 4 as can be known, automatically adjust LED display colour temperature temperature compensation control circuit, mainly show module by LED, the compositions such as LED driver IC wherein are provided with LED driver IC in LED demonstration module current supply circuit; Described LED driver IC is connected with temperature compensation control circuit, and this temperature compensation control circuit comprises current-limiting resistance R, build-out resistor R1 and thermistor Rt; Described build-out resistor R1 and thermistor Rt are in parallel, and after build-out resistor R1 and thermistor Rt parallel connection, an end and current-limiting resistance R are connected in series in the loop of described LED driver IC, other end ground connection.
LED driver IC comprises Input voltage terminal, outer meeting resistance end, output terminal, earth terminal, and wherein Input voltage terminal is connected with constant-current source circuit, and the input end of this constant-current source circuit connects power supply; Described outer meeting resistance end is connected with temperature compensation control circuit, and output terminal is connected with red LED by output circuit.Current-limiting resistance R is used for the restriction output current; Thermistor Rt is negative tempperature coefficient thermistor; Build-out resistor R1 is by in parallel with thermistor Rt and adjust red LED brightness.
Principle of work of the present invention is: the size of LED driver IC electric current is decided by the resistance of outside; The larger electric current of resistance value is less, otherwise electric current is larger.Add temperature-sensitive resistance on LED driver IC, when raising because of LED display module temperature, when this moment, red LED brightness descended, LED driver IC diminished automatically by the resistance of thermistor, thereby automatically improve red LED electric current, improve red LED luminance balance colour temperature; Otherwise when descending because of LED display module temperature, when red LED brightness raise, LED driver IC reduced the red LED electric current by the automatic increasing of thermistor Rt resistance, thereby reduced the brightness of red LED, reached the purpose of balance colour temperature.
The temperature compensation control circuit that foreign current of the present invention is regulated is comprised of two conventional, electric-resistance (current-limiting resistance R and build-out resistor R1) and a thermistor Rt, and wherein the effect of current-limiting resistance R is that the restriction output current can not be excessive; Even the negative tempperature coefficient thermistor Rt that is connected in series with it is 0 ohm, LED driver IC output current is also within the normal range of LED, thereby protection LED is unlikely to burn out because electric current is excessive.Rt is negative tempperature coefficient thermistor, and its characteristic is that resistance reduces when temperature raises; When temperature descended, resistance increased.The present invention's design is exactly the characteristic of utilizing this resistance, and when the brightness of LED display module temperature rising red LED descended, the resistance of thermistor Rt can reduce, and output current is increased, the LED luminance raising; When the brightness of LED display module temperature decline red LED raise, the resistance of thermistor Rt can increase, and output current is reduced, and LED brightness descends.R1 is build-out resistor in addition, makes the change curve of thermistor Rt consistent with the change curve of LED brightness; Make ED display screen module no matter be high temperature or low temperature, display effect is all consistent.
Automatically adjust the control method of the temperature compensation control circuit of LED display colour temperature, specifically comprise the following steps:
(1), the LED display module powers on, red LED driver IC, green LED driver IC, blue led driver IC start, and light the LED display module according to the default value that arranges;
(2), the temperature compensation control circuit of red LED driver IC connection starts;
(3), current-limiting resistance R limits output current, thermistor Rt reception LED display module temperature;
(4), a.LED shows that the module temperature raises, red LED brightness descends, thermistor Rt resistance reduces, output current increases, the red LED luminance raising;
B. LED shows that the module temperature reduces, the red LED luminance raising, and thermistor Rt resistance increases, and output current reduces, and red LED brightness descends;
(5), that build-out resistor R1 adjusts the change curve of thermistor Rt is consistent with the change curve of red LED brightness, makes LED show module no matter be high temperature or low temperature, its display effect is all consistent.
Fig. 3 is the circuit theory diagrams of another kind of preferred embodiment of the present invention.As shown in Figure 3, LED driver IC is connected with temperature compensation control circuit, and this temperature-compensation circuit comprises current-limiting resistance R, build-out resistor R1 and thermistor Rt; Described build-out resistor R1 and current-limiting resistance R series connection, in parallel with thermistor Rt after this build-out resistor R1, current-limiting resistance R series connection.Wherein the effect of current-limiting resistance R is that the restriction output current can not be excessive; Even with itself and the negative tempperature coefficient thermistor Rt that connects be 0 ohm, LED driver IC output current is also within the normal range of LED, thus protection LED is unlikely to burn out because electric current is excessive.Rt is negative tempperature coefficient thermistor, and its characteristic is that resistance reduces when temperature raises; When temperature descended, resistance increased.The present invention's design is exactly the characteristic of utilizing this resistance, and when the brightness of LED display module temperature rising red LED descended, the resistance of thermistor Rt can reduce, and output current is increased, the LED luminance raising; When the brightness of LED display module temperature decline red LED raise, the resistance of thermistor Rt can increase, and output current is reduced, and LED brightness descends.R1 is build-out resistor in addition, makes the change curve of thermistor Rt consistent with the change curve of LED brightness; Make ED display screen module no matter be high temperature or low temperature, display effect is all consistent.
To sum up, circuit of the present invention is simple and reliable, can be real-time complete LED display photochromic consistance backlight, the adjustment of white balance, efficient is high, accuracy is high.When display screen module temperature changed, LED driver IC regulated the electric current of red LED automatically by thermistor Rt, reached the automatic adjustment of LED display colour temperature white balance.
The above is only preferred embodiment of the present invention, but it is not to limit protection scope of the present invention, all any modifications of doing within the spirit and principles in the present invention, replaces on an equal basis and improves, within all being included in protection scope of the present invention.
Claims (5)
1. automatically adjust LED display colour temperature temperature compensation control circuit and control method, comprise that LED shows module, LED driver IC is provided with LED driver IC in this LED demonstration module current supply circuit; It is characterized in that, described LED driver IC is connected with temperature compensation control circuit, and this temperature compensation control circuit comprises current-limiting resistance R, build-out resistor R1 and thermistor Rt; Described build-out resistor R1 and thermistor Rt are in parallel, and after build-out resistor R1 and thermistor Rt parallel connection, an end and current-limiting resistance R are connected in series in the loop of described LED driver IC, other end ground connection.
2. automatic adjustment LED display colour temperature temperature compensation control circuit according to claim 1 and control method, it is characterized in that, described LED driver IC is connected with temperature compensation control circuit, and this temperature-compensation circuit comprises current-limiting resistance R, build-out resistor R1 and thermistor Rt; Described build-out resistor R1 and current-limiting resistance R series connection, in parallel with thermistor Rt after this build-out resistor R1, current-limiting resistance R series connection.
3. automatic adjustment LED display colour temperature temperature compensation control circuit according to claim 1 and 2 and control method, it is characterized in that, described LED driver IC comprises Input voltage terminal, outer meeting resistance end, output terminal, earth terminal, wherein Input voltage terminal is connected with constant-current source circuit, and the input end of this constant-current source circuit connects power supply; Described outer meeting resistance end is connected with temperature compensation control circuit.
4. automatic adjustment LED display colour temperature temperature compensation control circuit according to claim 1 and control method, is characterized in that, described current-limiting resistance R is used for the restriction output current; Thermistor Rt is negative tempperature coefficient thermistor; Build-out resistor R1 is by in parallel with thermistor Rt and adjust red LED brightness.
5. automatic adjustment LED display colour temperature temperature compensation control circuit according to claim 1 and control method, is characterized in that, automatically adjusts the control method of the temperature compensation control circuit of LED display colour temperature, specifically comprises the following steps:
(1), the LED display module powers on, red LED driver IC, green LED driver IC, blue led driver IC start, and light the LED display module according to the default value that arranges;
(2), the temperature compensation control circuit of red LED driver IC connection starts;
(3), current-limiting resistance R limits output current, thermistor Rt reception LED display module temperature;
(4), a.LED shows that the module temperature raises, red LED brightness descends, thermistor Rt resistance reduces, output current increases, the red LED luminance raising;
B. LED shows that the module temperature reduces, the red LED luminance raising, and thermistor Rt resistance increases, and output current reduces, and red LED brightness descends;
(5), that build-out resistor R1 adjusts the change curve of thermistor Rt is consistent with the change curve of red LED brightness, makes LED show module no matter be high temperature or low temperature, its display effect is all consistent.
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| CN2013101016587A CN103177692A (en) | 2013-03-27 | 2013-03-27 | Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method |
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| CN2013101016587A CN103177692A (en) | 2013-03-27 | 2013-03-27 | Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method |
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| CN103617788A (en) * | 2013-12-04 | 2014-03-05 | 中航华东光电有限公司 | Circuit for controlling day and night mode 6500K color temperature of LCD |
| CN105047132A (en) * | 2015-07-31 | 2015-11-11 | 苏州玄禾物联网科技有限公司 | Intelligent and automatic adjustment system for LED display screen |
| CN105161050A (en) * | 2015-07-31 | 2015-12-16 | 苏州玄禾物联网科技有限公司 | Intelligent automatic LED display white balance adjustment system |
| CN105551440A (en) * | 2015-12-08 | 2016-05-04 | 深圳天珑无线科技有限公司 | Mobile terminal and color temperature adjusting method thereof |
| CN105609044A (en) * | 2015-12-24 | 2016-05-25 | 大连集思特科技有限公司 | Video control system and method of LED color difference compensation |
| CN105702201A (en) * | 2016-03-22 | 2016-06-22 | 深圳市艾比森光电股份有限公司 | White balance control system and method for LED display screen |
| WO2018205614A1 (en) * | 2017-05-12 | 2018-11-15 | Boe Technology Group Co., Ltd. | Light-emitting assembly, lighting device, display panel, and display device |
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| CN112000170A (en) * | 2020-09-02 | 2020-11-27 | 合肥恒烁半导体有限公司 | Temperature compensation circuit and application thereof |
| CN112614455A (en) * | 2020-03-25 | 2021-04-06 | 西安诺瓦星云科技股份有限公司 | Display screen color temperature drift compensation method, device and system and display control system |
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| CN103617788B (en) * | 2013-12-04 | 2016-03-02 | 中航华东光电有限公司 | Control the circuit of LCD display pattern colour temperature 6500K round the clock |
| CN103617788A (en) * | 2013-12-04 | 2014-03-05 | 中航华东光电有限公司 | Circuit for controlling day and night mode 6500K color temperature of LCD |
| CN105047132A (en) * | 2015-07-31 | 2015-11-11 | 苏州玄禾物联网科技有限公司 | Intelligent and automatic adjustment system for LED display screen |
| CN105161050A (en) * | 2015-07-31 | 2015-12-16 | 苏州玄禾物联网科技有限公司 | Intelligent automatic LED display white balance adjustment system |
| CN105551440A (en) * | 2015-12-08 | 2016-05-04 | 深圳天珑无线科技有限公司 | Mobile terminal and color temperature adjusting method thereof |
| CN105609044A (en) * | 2015-12-24 | 2016-05-25 | 大连集思特科技有限公司 | Video control system and method of LED color difference compensation |
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| US11250772B2 (en) | 2017-05-12 | 2022-02-15 | Boe Technology Group Co., Ltd. | Light-emitting assembly, lighting device, display panel, and display device having light-emitting diodes with thermistor controlled brightness |
| WO2018205614A1 (en) * | 2017-05-12 | 2018-11-15 | Boe Technology Group Co., Ltd. | Light-emitting assembly, lighting device, display panel, and display device |
| CN108877642A (en) * | 2017-05-12 | 2018-11-23 | 京东方科技集团股份有限公司 | Luminescence component, display base plate and display device |
| CN108877668A (en) * | 2018-07-27 | 2018-11-23 | 京东方科技集团股份有限公司 | A kind of pixel circuit, its driving method and display panel |
| CN109287049B (en) * | 2018-10-16 | 2019-12-27 | 中国航发南方工业有限公司 | Formation lamp temperature drift compensation circuit, formation lamp control circuit and formation lamp control device |
| CN109287049A (en) * | 2018-10-16 | 2019-01-29 | 中国航发南方工业有限公司 | Formation light temperature drift compensation circuit, formation lamp control circuit and formation lamp control device |
| CN109686289A (en) * | 2018-12-27 | 2019-04-26 | 努比亚技术有限公司 | A kind of color temperature adjusting method, equipment and computer readable storage medium |
| CN109686289B (en) * | 2018-12-27 | 2023-11-10 | 西藏瀚灵科技有限公司 | Color temperature adjusting method, device and computer readable storage medium |
| CN112614455A (en) * | 2020-03-25 | 2021-04-06 | 西安诺瓦星云科技股份有限公司 | Display screen color temperature drift compensation method, device and system and display control system |
| CN112614455B (en) * | 2020-03-25 | 2022-07-15 | 西安诺瓦星云科技股份有限公司 | Display screen color temperature drift compensation method, device and system and display control system |
| CN112000170A (en) * | 2020-09-02 | 2020-11-27 | 合肥恒烁半导体有限公司 | Temperature compensation circuit and application thereof |
| CN112992051A (en) * | 2021-02-25 | 2021-06-18 | 厦门寒烁微电子有限公司 | Constant current source correction device and method of LED display |
| CN115294926A (en) * | 2022-09-26 | 2022-11-04 | 惠科股份有限公司 | Driving circuit, driving method, display device, and medium |
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Application publication date: 20130626 |