WO2012171238A1 - 一种改善因led升温引起伽马曲线偏离的电路及装置 - Google Patents

一种改善因led升温引起伽马曲线偏离的电路及装置 Download PDF

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Publication number
WO2012171238A1
WO2012171238A1 PCT/CN2011/077045 CN2011077045W WO2012171238A1 WO 2012171238 A1 WO2012171238 A1 WO 2012171238A1 CN 2011077045 W CN2011077045 W CN 2011077045W WO 2012171238 A1 WO2012171238 A1 WO 2012171238A1
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Prior art keywords
led
temperature
temperature sensing
gamma curve
sensing resistor
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PCT/CN2011/077045
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English (en)
French (fr)
Inventor
赵登霞
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/264,866 priority Critical patent/US8941568B2/en
Publication of WO2012171238A1 publication Critical patent/WO2012171238A1/zh
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    • 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
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

Definitions

  • the present invention relates to LCD display technology, and more particularly to a circuit and apparatus for improving the deviation of a GAMMA curve (gamma curve) caused by LED temperature rise.
  • GAMMA curve gamma curve
  • LCD Liquid Crystal Display, liquid crystal display
  • a light-emitting device Since the LCD itself does not emit light, it is necessary to use a light-emitting device as a backlight.
  • LEDs Light Emitting
  • Diode, LED Diode
  • the prior art solves the situation that the screen display changes due to the increase of the LED temperature by using a hardware circuit.
  • the Chinese application No. 200920132222.3 discloses a backlight module, a liquid crystal display and a liquid crystal television set thereof, which are coupled to a temperature through a liquid crystal panel driving circuit.
  • the sensor adjusts a driving voltage in response to the sensing signal, and drives the liquid crystal panel based on the adjusted driving voltage.
  • the prior art has the drawback that the prior art adjusts the illumination of the LED indirectly through the driving voltage, and the GAMMA curve cannot be directly and accurately adjusted, and the picture quality cannot be changed very well.
  • the object of the present invention is to provide a circuit and a device for improving the deviation of the GAMMA curve caused by the temperature rise of the LED, so as to solve the problem of adjusting the illumination of the LED by the driving voltage indirectly in the prior art, and the adjustment of the GAMMA curve cannot be directly and accurately performed, which is not very good. Change the picture quality problem.
  • the present invention is implemented as follows:
  • the present invention also provides a circuit for improving deviation of a GAMMA curve caused by temperature rise of an LED, comprising a temperature sensing resistor, an analog to digital converter and a memory, one end of the temperature sensing resistor being connected to the analog to digital converter, the analog digital The other end of the converter is connected to the memory, and the memory stores a lookup table, wherein the lookup table stores R ⁇ G ⁇ B color ratio data corresponding to LED temperatures of different stages, wherein the temperature sensing resistor Inductive LED temperature change, the analog-to-digital converter detects the value of the LED temperature change, and divides the temperature value of the LED, and reads the lookup table according to the LED temperature of different stages to obtain the LED temperature corresponding to different stages. R ⁇ G ⁇ B color.
  • the circuit for improving the deviation of the GAMMA curve caused by the temperature rise of the LED further comprises a constant current generating circuit, wherein the constant current generating circuit is an external circuit connected to one end of the temperature sensing resistor. .
  • the temperature sensing resistor is applied to the back of the printed circuit board
  • the number of temperature sensing resistors is at least one.
  • a circuit for improving deviation of a GAMMA curve caused by temperature rise of an LED comprising: a temperature sensing resistor, an analog to digital converter, and a memory, wherein one end of the temperature sensing resistor is connected to the analog to digital converter, and the analog to digital conversion The other end of the device is connected to the memory, and a lookup table is stored in the memory.
  • the circuit for improving the deviation of the GAMMA curve caused by the temperature rise of the LED further comprises a constant current generating circuit, wherein the constant current generating circuit is an external circuit connected to one end of the temperature sensing resistor. .
  • the lookup table stores R ⁇ G ⁇ B color scale data corresponding to LED temperatures at different stages.
  • the temperature sensing resistor is applied to the back side of the printed circuit board.
  • the number of temperature sensing resistors is at least one.
  • the present invention also provides an apparatus for improving deviation of a GAMMA curve caused by temperature rise of an LED, comprising a printed circuit board, a temperature sensing resistor, an analog to digital converter, and a memory, wherein the temperature sensing resistor is coated on the printed circuit board.
  • One end of the temperature sensing resistor is connected to the analog to digital converter, and the other end of the analog to digital converter is connected to the memory, and a memory is stored in the memory.
  • the apparatus for improving the deviation of the GAMMA curve caused by the temperature rise of the LED further comprises a constant current generating circuit, wherein the constant current generating circuit is an external circuit connected to one end of the temperature sensing resistor. .
  • the lookup table stores R ⁇ G ⁇ B color scale data corresponding to LED temperatures at different stages.
  • the temperature sensing resistor is applied to the back side of the printed circuit board.
  • the number of temperature sensing resistors is at least one.
  • the technical solution of the present invention has the following advantages or advantages: the technical solution provided by the present invention detects and senses the actual temperature of the LED by applying a temperature sensing resistor on the PCB board of the LED, and then connects the LED by connecting an analog to digital converter. The temperature phase is divided, and the R ⁇ G ⁇ B color ratio data at the corresponding temperature is selected to adjust the GAMMA curve at different LED temperatures to improve the quality of the picture.
  • the invention has the advantages of simple structure, convenient implementation and energy saving and environmental protection.
  • the technical solution provided by the invention applies the temperature sensing resistor on the PCB board of the LED to detect and sense the actual temperature of the LED, and then divides the temperature stage of the LED by connecting an analog to digital converter, and selects the R at the corresponding temperature. ⁇ G ⁇ B color ratio data, thus adjusting the GAMMA curve at different LED temperatures to improve the quality of the picture.
  • the invention has the advantages of simple structure, convenient implementation and energy saving and environmental protection.
  • FIG. 1 is a schematic structural view of a circuit for improving a deviation of a GAMMA curve caused by temperature rise of an LED according to a first preferred embodiment of the present invention
  • FIG. 2 is a schematic structural view of a circuit for improving a deviation of a GAMMA curve caused by temperature rise of an LED according to a second preferred embodiment of the present invention
  • FIG. 3 is a schematic structural view of an apparatus for improving a deviation of a GAMMA curve caused by temperature rise of an LED according to a first preferred embodiment of the present invention
  • FIG. 4 is a schematic structural view of an apparatus for improving deviation of a GAMMA curve caused by temperature rise of an LED according to a second preferred embodiment of the present invention.
  • FIG. 1 is a schematic structural view of a circuit for improving a deviation of a GAMMA curve caused by temperature rise of an LED according to a first preferred embodiment of the present invention.
  • the circuit for improving the deviation of the GAMMA curve caused by the temperature rise of the LED of the first preferred embodiment of the present invention includes a constant current generating circuit 10, an analog to digital converter 20, a memory 30, a lookup table 40, and a temperature sensing resistor 50, wherein constant current generation
  • the circuit 10 is an external circuit connected to one end of the temperature sensing resistor 50, the temperature sensing resistor 50 is connected to the analog to digital converter 20, the analog to digital converter 20 is connected to the memory 30, and the lookup table 40 is stored in the memory 30.
  • the lookup table 40 stores R ⁇ G ⁇ B color scale data corresponding to the LED temperatures of different stages.
  • the external constant current generating circuit 10 obtains a temperature-independent reference current Iref.
  • the voltage across the resistor 50 also changes, and the value of the LED temperature change (ie, the current actual operating temperature) is detected by the connected analog-to-digital converter 20, and the temperature value of the LED is divided into stages, according to the LEDs of different stages.
  • the temperature reading lookup table 40 obtains the R ⁇ G ⁇ B color ratio data corresponding to the LED temperatures at different stages to adjust the GAMMA curve at different LED temperatures to improve the picture quality.
  • the number of the temperature sensing resistors is at least one, and may be increased or decreased according to different requirements. The more the number of temperature sensing resistors, the more accurate the value of the sensing LED temperature.
  • FIG. 2 is a schematic view showing the structure of a circuit for improving the deviation of the GAMMA curve caused by the temperature rise of the LED according to the second preferred embodiment of the present invention.
  • the circuit for improving the deviation of the GAMMA curve caused by the temperature rise of the LED according to the second preferred embodiment of the present invention includes the constant current generating circuit 10, the analog to digital converter 20, the memory 30, the lookup table 40, the first temperature sensing resistor 60, and the second temperature.
  • the sensing resistor 70 and the third temperature sensing resistor 80 wherein the constant current generating circuit 10 is an external circuit, and one ends of the first temperature sensing resistor 60, the second temperature sensing resistor 70, and the third temperature sensing resistor 80 are respectively connected to the constant current generating circuit. 10 is connected and connected to an analog to digital converter 20, an analog to digital converter 20 is connected to the memory 30, and a lookup table 40 is stored in the memory 30.
  • the lookup table 40 stores R ⁇ G ⁇ B color scale data corresponding to the LED temperatures of different stages.
  • the resistance value, f(T) is the temperature coefficient of the resistor
  • a temperature-independent reference current Iref is obtained by the external constant current generating circuit 10, and when the LED temperature changes, the first temperature sensing resistor 60, the second The temperature sensing resistor 70 and the third temperature sensing resistor 80 sense the temperature change of the LED, and the resistance values of the first temperature sensing resistor 60, the second temperature sensing resistor 70, and the third temperature sensing resistor 80 are changed, and the voltage applied across the resistor is changed.
  • the value of the LED temperature change (ie, the current actual operating temperature) is obtained through the detection of the connected analog-to-digital converter 20, and the temperature value of the LED is divided into stages, and the LED temperature reading is performed according to different stages.
  • Table 40 Obtain the R ⁇ G ⁇ B color ratio data corresponding to the LED temperature at different stages to adjust the GAMMA curve at different LED temperatures to improve the picture quality.
  • the number of temperature sensing resistors since the number of temperature sensing resistors is large, the sensitivity of the temperature change of the sensing LED can be further improved, and the sensing temperature value is more accurate, so that the GAMMA curve can be adjusted faster and better.
  • the number of temperature sensing resistors may be increased or decreased according to actual needs, and the number is not limited to the three temperature sensing resistors in the second preferred embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an apparatus for improving a deviation of a GAMMA curve caused by temperature rise of an LED according to a first preferred embodiment of the present invention.
  • the improvement of the first preferred embodiment provided by the present invention causes a GAMMA curve caused by temperature rise of the LED.
  • the offset device includes a constant current generating circuit 10, an analog to digital converter 20, a memory 30, a lookup table 40, a temperature sensing resistor 50, and a printed circuit board 90, wherein the temperature sensing resistor 50 is coated on the back side of the printed circuit board 90, constant
  • the current generating circuit 10 is an external circuit connected to one end of the temperature sensing resistor 50, the temperature sensing resistor 50 is connected to the analog to digital converter 20, the analog to digital converter 20 is connected to the memory 30, and the lookup table 40 is stored in the memory 30.
  • the lookup table 40 stores R ⁇ G ⁇ B color scale data corresponding to the LED temperatures of different stages.
  • the external constant current generating circuit 10 obtains a temperature-independent reference current Iref.
  • Iref temperature-independent reference current
  • the temperature change of the LED is sensed by the temperature sensing resistor 50, and the resistance value of the temperature sensing resistor 50 changes, and is added to the temperature sensing.
  • the voltage across the resistor 50 also changes, and the value of the LED temperature change (ie, the current actual operating temperature) is obtained by the detection of the connected analog-to-digital converter 20, and the temperature value of the LED is divided into stages according to different stages.
  • the LED temperature reading lookup table 40 obtains the R ⁇ G ⁇ B color ratio data corresponding to the LED temperature at different stages to adjust the GAMMA curve at different LED temperatures to improve the picture quality.
  • the analog to digital converter is directly mounted on the PCB, which can greatly save space.
  • FIG. 4 is a schematic structural view of a device for improving deviation of a GAMMA curve caused by LED temperature rise according to a second preferred embodiment of the present invention.
  • the second preferred embodiment of the present invention improves the GAMMA curve caused by LED temperature rise.
  • the offset device includes a constant current generating circuit 10, an analog to digital converter 20, a memory 30, a lookup table 40, a first temperature sensing resistor 60, a second temperature sensing resistor 70, a third temperature sensing resistor 80, and a printed circuit board 90, wherein
  • the constant current generating circuit 10 is an external circuit, and one ends of the first temperature sensing resistor 60, the second temperature sensing resistor 70, and the third temperature sensing resistor 80 applied to the back surface of the printed circuit board 90 are respectively connected to the constant current generating circuit 10,
  • the analog-to-digital converter 20 is connected to the memory 30, and the lookup table 40 is stored in the memory 30.
  • the lookup table 40 stores R ⁇ G ⁇ B color scale data corresponding to the LED temperatures of different
  • the resistance value, f(T) is the temperature coefficient of the resistor
  • a temperature-independent reference current Iref is obtained by the external constant current generating circuit 10, and when the LED temperature changes, the first temperature sensing resistor 60, the second The temperature sensing resistor 70 and the third temperature sensing resistor 80 sense the temperature of the LED, and the resistance values of the first temperature sensing resistor 60, the second temperature sensing resistor 70, and the third temperature sensing resistor 80 are changed, and the voltage applied across the resistor is also With the change, the value of the LED temperature change (ie, the current actual operating temperature) is obtained through the detection of the connected analog-to-digital converter 20, and the temperature value of the LED is divided into stages, and the look-up table is read according to the LED temperature of different stages
  • the number of temperature sensing resistors since the number of temperature sensing resistors is large, the sensitivity of the temperature change of the sensing LED can be further improved, and the sensing temperature value is more accurate, so that the GAMMA curve can be adjusted faster and better. .
  • the number of temperature sensing resistors may be increased or decreased according to actual needs, and the number is not limited to the three temperature sensing resistors in the second preferred embodiment of the present invention.
  • the analog to digital converter is directly mounted on the PCB, which can greatly save space.
  • the circuit and the device for improving the deviation of the GAMMA curve caused by the LED heating up are detected and sensed by applying a temperature sensing resistor on the PCB board of the LED, and then connecting the analog to digital converter to the temperature of the LED.
  • the stage is divided, and the R ⁇ G ⁇ B color ratio data at the corresponding temperature is selected to adjust the GAMMA curve at different LED temperatures to improve the quality of the picture.
  • the invention has the advantages of simple structure, convenient implementation and energy saving and environmental protection.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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Abstract

一种改善因LED升温引起GAMMA曲线偏离的电路包括温度感应电阻（50）、模拟数字转换器（20）和查找表（40）。所述温度感应电阻（50）的一端与所述模拟数字转换器（20）连接，所述模拟数字转换器（20）与所述查找表（40）连接。还披露了一种改善因LED升温引起GAMMA曲线偏离的装置。

Description

一种改善因LED升温引起伽马曲线偏离的电路及装置 技术领域
本发明涉及LCD显示技术，尤其涉及一种改善因LED升温引起GAMMA曲线（伽马曲线）偏离的电路及装置。
 背景技术
LCD（Liquid Crystal Display，液晶显示器）正逐渐成为主流显示器。由于LCD自身不发光，需要采用发光器件作为背光源，现有LCD很多采用LED（Light Emitting Diode，发光二极管）作为背光源。由于受使用环境或使用时间等因素的影响，LED的温度会升高，LED的发光光谱也会随着温度的升高发生改变，因而人眼看到的R、G、B管组成的像素点的比例也会随之改变，导致GAMMA曲线偏离、画面显示发生改变，从而影响用户的视觉效果。
现有技术通过硬件电路来解决因LED温度升高导致画面显示发生改变的情况，如中国申请第200920132222.3号公开一种背光模块、液晶显示器及其液晶电视机，其通过液晶面板驱动电路耦接温度传感器，响应于感测信号来调节驱动电压，并基于调节后的驱动电压来驱动液晶面板。但是现有技术的缺陷在于：现有技术是间接通过驱动电压来调节LED的发光，不能直接、准确的进行GAMMA曲线的调节，不能非常好的改变画面品质。
故，有必要提供一种改善因LED升温引起GAMMA曲线偏离的电路及装置，以解决现有技术间接通过驱动电压来调节LED的发光，不能直接、准确的进行GAMMA曲线的调节，不能非常好的改变画面品质的问题
 技术问题
本发明的目的在于提供一种改善因LED升温引起GAMMA曲线偏离的电路及装置，以解决现有技术间接通过驱动电压来调节LED的发光，不能直接、准确的进行GAMMA曲线的调节，不能非常好的改变画面品质问题。
 技术解决方案
本发明是这样实现的：
本发明还提供了一种改善因LED升温引起GAMMA曲线偏离的电路，包括温度感应电阻、模拟数字转换器和存储器，所述温度感应电阻的一端与所述模拟数字转换器连接，所述模拟数字转换器另一端与所述存储器连接，所述存储器中存储有查找表，所述查找表中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据，其中，所述温度感应电阻感应LED温度的变化，所述模拟数字转换器检测出LED温度变化的值，并对LED的温度值进行阶段划分，根据不同阶段的LED温度读取查找表，获取不同阶段的LED温度所对应的R\G\B色。
在本发明的一较佳实施例中，本发明的改善因LED升温引起GAMMA曲线偏离的电路还包括恒定电流产生电路，所述恒定电流产生电路为外接电路，与所述温度感应电阻的一端连接。
在本发明的一较佳实施例中，所述温度感应电阻涂布于印刷电路板的背面
在本发明的一较佳实施例中，所述温度感应电阻的数量最少为一个。
一种改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，包括温度感应电阻、模拟数字转换器和存储器，所述温度感应电阻的一端与所述模拟数字转换器连接，所述模拟数字转换器另一端与所述存储器连接，所述存储器中存储有查找表。
在本发明的一较佳实施例中，本发明的改善因LED升温引起GAMMA曲线偏离的电路还包括恒定电流产生电路，所述恒定电流产生电路为外接电路，与所述温度感应电阻的一端连接。
在本发明的一较佳实施例中，所述查找表中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
在本发明的一较佳实施例中，所述温度感应电阻涂布于印刷电路板的背面。
在本发明的一较佳实施例中，所述温度感应电阻的数量最少为一个。
本发明还提供了一种改善因LED升温引起GAMMA曲线偏离的装置，包括印刷电路板、温度感应电阻、模拟数字转换器和存储器，所述温度感应电阻涂布在所述印刷电路板上，所述温度感应电阻的一端与所述模拟数字转换器连接，所述模拟数字转换器另一端与所述存储器连接，所述存储器中存储有查找表。
在本发明的一较佳实施例中，本发明的改善因LED升温引起GAMMA曲线偏离的装置还包括恒定电流产生电路，所述恒定电流产生电路为外接电路，与所述温度感应电阻的一端连接。
在本发明的一较佳实施例中，所述查找表中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
在本发明的一较佳实施例中，所述温度感应电阻涂布于印刷电路板的背面。
在本发明的一较佳实施例中，所述温度感应电阻的数量最少为一个。
本发明的技术方案具有如下优点或有益效果：本发明提供的技术方案通过在LED的PCB板上涂布温度感应电阻，对LED的实际温度进行检测和感应，再通过连接模拟数字转换器对LED的温度阶段进行划分，选择相应温度下的R\G\B色彩比例数据，从而调整不同LED温度下的GAMMA曲线，改善画面的品质。另外，本发明结构简单，实现便利，并有利于节能环保。
 有益效果
本发明提供的技术方案通过在LED的PCB板上涂布温度感应电阻，对LED的实际温度进行检测和感应，再通过连接模拟数字转换器对LED的温度阶段进行划分，选择相应温度下的R\G\B色彩比例数据，从而调整不同LED温度下的GAMMA曲线，改善画面的品质。另外，本发明结构简单，实现便利，并有利于节能环保。
附图说明
图1为本发明的第一较佳实施例的改善因LED升温引起GAMMA曲线偏离的电路的结构示意图；
图2为本发明的第二较佳实施例的改善因LED升温引起GAMMA曲线偏离的电路的结构示意图；
图3为本发明的第一较佳实施例的改善因LED升温引起GAMMA曲线偏离的装置的结构示意图；
图4为本发明的第二较佳实施例的改善因LED升温引起GAMMA曲线偏离的装置的结构示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
如图1所示，为本发明的第一较佳实施例的改善因LED升温引起GAMMA曲线偏离的电路的结构示意图。本发明的第一较佳实施例的改善因LED升温引起GAMMA曲线偏离的电路包括恒定电流产生电路10、模拟数字转换器20、存储器30、查找表40和温度感应电阻50，其中，恒定电流产生电路10为外接电路，与温度感应电阻50的一端连接，温度感应电阻50与模拟数字转换器20连接，模拟数字转换器20与存储器30连接，查找表40存储于存储器30中。查找表40中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
温度感应电阻50的阻值是温度的函数，可以简化表示为：R=R0+f(T)R，其中，R0为室温下对应的电阻阻值，f(T)为电阻的温度系数，通过外接的恒定电流产生电路10得到一个与温度无关的基准电流Iref，当LED温度发生改变时，通过温度感应电阻50感应LED的温度变化，温度感应电阻50的阻值会发生改变，加在温度感应电阻50两端的电压也随之变化，通过连接的模拟数字转换器20检测得出LED温度变化的值（即当前的实际工作温度），并对LED的温度值进行阶段划分，根据不同阶段的LED温度读取查找表40，获取不同阶段的LED温度所对应的R\G\B色彩比例数据，来调整不同LED温度下的GAMMA曲线，以改善画面品质。
在本发明实施例中，上述的温度感应电阻的数量最少为一个，具体还可以根据不同需求增加或减少，温度感应电阻的数量越多，感应LED温度的值会越精准。如图2所示，为本发明的第二较佳实施例的改善因LED升温引起GAMMA曲线偏离的电路的结构示意图。本发明的第二较佳实施例的改善因LED升温引起GAMMA曲线偏离的电路包括恒定电流产生电路10、模拟数字转换器20、存储器30、查找表40、第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80，其中，恒定电流产生电路10为外接电路，第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80的一端分别与恒定电流产生电路10连接，并分别与模拟数字转换器20连接，模拟数字转换器20与存储器30连接，查找表40存储于存储器30中。查找表40中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80的阻值是温度的函数，可以简化表示为：R=R0+f(T)R，其中，R0为室温下对应的电阻阻值，f(T)为电阻的温度系数，通过外接的恒定电流产生电路10得到一个与温度无关的基准电流Iref，当LED温度发生改变时，通过第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80感应LED的温度变化，第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80的阻值会发生改变，加在电阻两端的电压也随之变化，通过连接的模拟数字转换器20的检测得出LED温度变化的值（即当前的实际工作温度），并对LED的温度值进行阶段划分，根据不同阶段的LED温度读取查找表40，获取不同阶段的LED温度所对应的R\G\B色彩比例数据，来调整不同LED温度下的GAMMA曲线，以改善画面品质。
在本发明第二较佳实施例中，由于温度感应电阻的数量较多，可进一步提高感应LED温度变化的敏感度，感应温度值也会更为精准，使GAMMA曲线得到更快更好的调整，在本发明第二较佳实施例中，温度感应电阻的个数可以根据实际需求增加或减少，个数不局限于本发明第二较佳实施例中的三个温度感应电阻。
如图3所示，为本发明提供的第一较佳实施例的改善因LED升温引起GAMMA曲线偏离的装置的结构示意图，本发明提供的第一较佳实施例的改善因LED升温引起GAMMA曲线偏离的装置包括恒定电流产生电路10、模拟数字转换器20、存储器30、查找表40、温度感应电阻50和印刷电路板90，其中，温度感应电阻50涂布在印刷电路板90的背面，恒定电流产生电路10为外接电路，与温度感应电阻50的一端连接，温度感应电阻50与模拟数字转换器20连接，模拟数字转换器20与存储器30连接，查找表40存储于存储器30中。查找表40中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
温度感应电阻50的阻值是温度的函数，可以简化表示为：R=R0+f(T)R，其中，R0为室温下对应的电阻阻值，f(T)为电阻的温度系数，通过外接的恒定电流产生电路10得到一个与温度无关的基准电流Iref，当LED温度发生改变时，通过温度感应电阻50感应LED的温度变化，温度感应电阻50的阻值会发生改变，加在温度感应电阻50两端的电压也随之变化，通过连接的模拟数字转换器20的检测得出LED温度变化的值（即当前的实际工作温度），并对LED的温度值进行阶段划分，根据不同阶段的LED温度读取查找表40，获取不同阶段的LED温度所对应的R\G\B色彩比例数据，来调整不同LED温度下的GAMMA曲线，以改善画面品质。
另外，在本发明另一实施例中，将模拟数字转换器直接安装在PCB板上，可大大节省占用空间。
如图4所示，为本发明提供的第二较佳实施例的改善因LED升温引起GAMMA曲线偏离的装置的结构示意图，本发明提供的第二较佳实施例的改善因LED升温引起GAMMA曲线偏离的装置包括恒定电流产生电路10、模拟数字转换器20、存储器30、查找表40、第一温度感应电阻60、第二温度感应电阻70、第三温度感应电阻80和印刷电路板90，其中，恒定电流产生电路10为外接电路，涂布于印刷电路板90背面的第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80的一端分别与恒定电流产生电路10连接，并分别与模拟数字转换器20连接，模拟数字转换器20与存储器30连接，查找表40存储于存储器30中。查找表40中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80的阻值是温度的函数，可以简化表示为：R=R0+f(T)R，其中，R0为室温下对应的电阻阻值，f(T)为电阻的温度系数，通过外接的恒定电流产生电路10得到一个与温度无关的基准电流Iref，当LED温度发生改变时，通过第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80感应LED的温度，第一温度感应电阻60、第二温度感应电阻70和第三温度感应电阻80的阻值会发生改变，加在电阻两端的电压也随之变化，通过连接的模拟数字转换器20的检测得出LED温度变化的值（即当前的实际工作温度），并对LED的温度值进行阶段划分，根据不同阶段的LED温度读取查找表40，获取不同阶段的LED温度所对应的R\G\B色彩比例数据，来调整不同LED温度下的GAMMA曲线，以改善画面品质。
在本发明第二较佳实施例中，由于温度感应电阻的数量较多，可进一步提高感应LED温度变化的敏感度，感应温度值也会更为精准，使GAMMA曲线得到更快更好的调整。在本发明第二较佳实施例中，温度感应电阻的个数可以根据实际需求增加或减少，个数不局限于本发明第二较佳实施例中的三个温度感应电阻。另外，在本发明另一实施例中，将模拟数字转换器直接安装在PCB板上，可大大节省占用空间。
本发明提供的改善因LED升温引起GAMMA曲线偏离的电路及装置通过在LED的PCB板上涂布温度感应电阻，对LED的实际温度进行检测和感应，再通过连接模拟数字转换器对LED的温度阶段进行划分，选择相应温度下的R\G\B色彩比例数据，从而调整不同LED温度下的GAMMA曲线，改善画面的品质。另外，本发明结构简单，实现便利，并有利于节能环保。
综上所述，虽然本发明已以较佳实施例揭露如上，但上述较佳实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
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Claims (14)

  1. 一种改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，包括温度感应电阻、模拟数字转换器和存储器，所述温度感应电阻的一端与所述模拟数字转换器连接，所述模拟数字转换器另一端与所述存储器连接，所述存储器中存储有查找表，所述查找表中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据，其中，所述温度感应电阻感应LED温度的变化，所述模拟数字转换器检测出LED温度变化的值，并对LED的温度值进行阶段划分，根据不同阶段的LED温度读取查找表，获取不同阶段的LED温度所对应的R\G\B色。
  2. 根据权利要求1所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，还包括恒定电流产生电路，所述恒定电流产生电路为外接电路，与所述温度感应电阻的一端连接。
  3. 根据权利要求1或2所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，所述温度感应电阻涂布于印刷电路板的背面
  4. 根据权利要求3所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，所述温度感应电阻的数量最少为一个。
  5. 一种改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，包括温度感应电阻、模拟数字转换器和存储器，所述温度感应电阻的一端与所述模拟数字转换器连接，所述模拟数字转换器另一端与所述存储器连接，所述存储器中存储有查找表。
  6. 根据权利要求5所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，还包括恒定电流产生电路，所述恒定电流产生电路为外接电路，与所述温度感应电阻的一端连接。
  7. 根据权利要求5或6所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，所述查找表中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
  8. 根据权利要求7所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，所述温度感应电阻涂布于印刷电路板的背面。
  9. 根据权利要求7所述的改善因LED升温引起GAMMA曲线偏离的电路，其特征在于，所述温度感应电阻的数量最少为一个。
  10. 一种改善因LED升温引起GAMMA曲线偏离的装置，包括印刷电路板，其特征在于，还包括温度感应电阻、模拟数字转换器和存储器，所述温度感应电阻涂布在所述印刷电路板上，所述温度感应电阻的一端与所述模拟数字转换器连接，所述模拟数字转换器另一端与所述存储器连接，所述存储器中存储有查找表。
  11. 根据权利要求10所述的改善因LED升温引起GAMMA曲线偏离的装置，其特征在于，还包括恒定电流产生电路，所述恒定电流产生电路为外接电路，与所述温度感应电阻的一端连接。
  12. 根据权利要求10或11所述的改善因LED升温引起GAMMA曲线偏离的装置，其特征在于，所述查找表中存储有不同阶段的LED温度所对应的R\G\B色彩比例数据。
  13. 根据权利要求12所述的改善因LED升温引起GAMMA曲线偏离的装置，其特征在于，所述温度感应电阻涂布于印刷电路板的背面。
  14. 根据权利要求12所述的改善因LED升温引起GAMMA曲线偏离的装置，其特征在于，所述温度感应电阻的数量最少为一个。
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