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Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method

An LED display, temperature compensation technology, applied in static indicators, instruments, etc., can solve problems such as color difference and poor white balance, and achieve the effects of high accuracy, consistent color temperature, and simple and reliable circuits

Inactive Publication Date: 2013-06-26
SHENZHEN GLOSHINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a temperature compensation control circuit and control method for automatically adjusting the color temperature of LED display screens, so as to solve the technical problems of LED display screens such as color difference and poor white balance caused by temperature in the prior art.

Method used

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  • Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method
  • Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method
  • Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method

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Embodiment 1

[0023] figure 2 It is a circuit schematic diagram of a preferred embodiment of the present invention; Figure 4 It is a schematic diagram of the module of the present invention. Depend on figure 2 combine Figure 4 It can be seen that the temperature compensation control circuit for automatically adjusting the color temperature of the LED display is mainly composed of an LED display module, an LED driver IC, etc., wherein an LED driver IC is provided in the power supply circuit of the LED display module; the LED driver IC is connected to a temperature compensation control circuit. circuit, the temperature compensation control circuit includes a current-limiting resistor R, a matching resistor R1 and a thermistor Rt; the matching resistor R1 and the thermistor Rt are connected in parallel, and one end of the matching resistor R1 and the thermistor Rt is connected in parallel with the current-limiting resistor R It is connected in series in the loop of the LED driver IC, an...

Embodiment 2

[0035] image 3 Is the circuit schematic diagram of another preferred embodiment of the present invention. Depend on image 3It can be seen that the LED driver IC is connected with a temperature compensation control circuit, and the temperature compensation circuit includes a current limiting resistor R, a matching resistor R1 and a thermistor Rt; the matching resistor R1 and the current limiting resistor R are connected in series, the matching resistor R1, the current limiting resistor Rt The resistor R is connected in parallel with the thermistor Rt after being connected in series. The role of the current limiting resistor R is to limit the output current from being too large; even if the negative temperature coefficient thermistor Rt connected in parallel with it is 0 ohms, the output current of the LED driver IC is within the normal range of the LED, thus protecting the LED from Burned out due to excessive current. Rt is a negative temperature coefficient thermistor, an...

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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 [0001] The invention relates to the technical field of LED display screens, in particular to a temperature compensation control circuit and control method for automatically adjusting the color temperature of LED display screens. Background technique [0002] With the development of science and technology, the maturity of LED technology, and the cost is also greatly reduced, LED display screens have been widely used. The LED display is a display device composed of light-emitting diodes installed in a matrix, which can display characters and image information. Due to the difference in brightness of light-emitting diodes during production and different degrees of brightness attenuation during use, the overall brightness and chromaticity of the LED display are uneven, which seriously affects the display effect of the LED display. In the previous LED display circuit (such as figure 1 As shown), since there is no temperature compensation circuit, the local temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
Inventor 张永军
Owner SHENZHEN GLOSHINE TECH
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