Thermal protection system of LED backlight light bar

Abstract

The invention relates to a thermal protection system of an LED backlight light bar. The thermal protection system comprises a voltage detection unit, a processing control unit, a driving unit and a plurality of temperature control switches, wherein the temperature control switch is used for being connected with a lamp bead on the LED backlight lamp bar in parallel and is closed when the temperature of the lamp bead is higher than a preset temperature value; the voltage detection unit is used for detecting the voltage of all lamp beads on the LED backlight lamp bar in real time and outputting a voltage detection signal; the processing control unit is used for outputting a control signal when the voltage value reflected by the voltage detection signal is reduced; and the driving unit is used for reducing the size of a driving current for driving the LED backlight light bar to emit light when receiving the control signal. When the temperature of a certain lamp bead exceeds a preset temperature value, the corresponding temperature control switch can be switched on, so that the lamp bead is short-circuited. When the temperature of the lamp bead reaches the preset temperature value, the processing control unit can control the driving unit to reduce the driving current so as to reduce the heating value of the lamp bead and further reduce the probability that the lamp bead is burnt down.

Description

technical field [0001] The present application relates to the field of backlight light strips, in particular to a thermal protection system for LED backlight light strips. Background technique [0002] Generally, the light source displayed by the liquid crystal display comes from the LED backlight strip inside the liquid crystal display. The number of LEED backlight strips installed inside each LCD depends on the size of the LCD. Usually, at least two LED backlight strips are arranged inside the LCD screen. Wherein, each LED backlight strip is composed of multiple LED lamp beads connected in series. [0003] It can be understood that the power of the LED backlight is relatively large, and the heat dissipation is relatively large, but the heat dissipation area is limited, and the ventilation of the liquid crystal display screen after packaging is also poor. After the user watches for a long time, if the heat of the LED lamp beads cannot be dissipated in time, there is a ri...

AI Technical Summary

Problems solved by technology

[0003] It can be understood that the power of the LED backlight is relatively large, and the heat dissipation is also relatively large, but the heat dissipation area is limited, and the ventilation of the encapsulated LCD screen is also poor.

After the user watches for a long time, if the heat of the LED lamp beads cannot be dissipated in time, there is a risk of being burned out

Burned-out lamp beads are common on TVs with a long service life, and these burnt-out lamp beads will continue to burn out repeatedly after replacement, resulting in high repair costs

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