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Backlight constant brightness control system

A constant brightness, control system technology, applied in optics, nonlinear optics, electrical components, etc., can solve problems such as inconvenient adjustment

Pending Publication Date: 2021-09-10
厦门佰晟电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brightness of LED lights is easily affected by many factors such as temperature and luminous time. In order to keep the brightness of LED lights constant, the existing staff usually measure the brightness through a luminance meter, and then manually adjust it to a suitable brightness. The disadvantage of inconvenient adjustment

Method used

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Embodiment Construction

[0027] The following is attached Figure 1-2 The application is described in further detail.

[0028] refer to figure 1 and figure 2 , the embodiment of the present application discloses a backlight constant brightness control system. It includes a backlight table 1, and an LED lamp board 2 is horizontally arranged in the backlight table 1, and the LED lamp board 2 is used to control the LED lamp to emit light. The surface of the backlight table 1 located above the LED lamp board 2 is provided with a diffusion sheet 3, and the light of the LED lamp is uniformly diffused through the diffusion sheet 3, thereby improving the detection effect of the backlight on the liquid crystal screen.

[0029] The LED lamp board 2 is electrically connected to a control board 4, and the control board 4 is used to control the brightness of the LED lamp; the side wall of the backlight table 1 is provided with a brightness sensor 5, and the brightness sensor 5 is used to detect the actual lumi...

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PUM

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Abstract

The invention relates to a backlight constant brightness control system, which is technically characterized by comprising: a control board, wherein a brightness negative feedback control circuit used for controlling the brightness of an LED to be constant is arranged in the control board; a LED board connected to the control board, wherein the control board controls the light emitting and lighting actions of a plurality of LEDs on the LED board; and a sensor connected to the control board and used for detecting the actual light emitting brightness of the LED board, converting the brightness into an electric signal and inputting the electric signal into the brightness feedback control circuit, wherein the brightness negative feedback control circuit comprises a PID controller, and the PID controller is used for comparing the actual light emitting brightness detected by the sensor with the brightness set by the control board so as to output a stable brightness control signal. The backlight constant brightness control system has the advantage of stabilizing the backlight effect.

Description

technical field [0001] The invention relates to the field of liquid crystal screen detection equipment, more specifically, it relates to a backlight constant brightness control system. Background technique [0002] In the production process of LCD screens, a backlight inspection table is needed to detect whether the product is good or bad, and the backlight inspection table is equipped with an LED light board. In order to ensure the detection effect of the LCD screen, the brightness of the LED light on the LED light board needs to be kept stable. The brightness of LED lights is easily affected by many factors such as temperature and luminous time. In order to keep the brightness of LED lights constant, the existing staff usually measure the brightness through a luminance meter, and then manually adjust it to a suitable brightness. The disadvantage of inconvenient adjustment. Contents of the invention [0003] In order to keep the brightness of the LED lamp constant, the p...

Claims

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Application Information

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IPC IPC(8): H05B45/12G02F1/13
CPCH05B45/12G02F1/1309
Inventor 王进勇
Owner 厦门佰晟电子有限公司
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