Backlight LED matrix driving device for display and fault detection method

The invention discloses a backlight LED matrix driving device. A driving circuit comprises a power supply unit, an LED lamp string, a driving controller, an ADC voltage detection circuit and a DAC current control circuit. The ADC voltage detection circuit detects the voltage value Vled of the negati...

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Bibliographic Details
Main Authors YANG GUANOU, JIN HUIJIAO
Format Patent
LanguageChinese
English
Published 11.03.2022
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
PHYSICS
SEALS
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Summary:The invention discloses a backlight LED matrix driving device. A driving circuit comprises a power supply unit, an LED lamp string, a driving controller, an ADC voltage detection circuit and a DAC current control circuit. The ADC voltage detection circuit detects the voltage value Vled of the negative end of the LED lamp string and converts the measured voltage value Vled of the negative end of the LED lamp string into a voltage value code; the DAC current control circuit converts the current value code into an analog voltage signal so as to control the current value of the LED lamp string; and the driving controller obtains an actual working power value of the LED lamp string channel through operation of a current value code input into the DAC module and a voltage value code output by the ADC sampling module, and judges that the LED lamp string has a short-circuit fault. 本发明公开了一种背光LED矩阵驱动装置，所述驱动电路包括：电源单元、LED灯串、驱动控制器、ADC电压侦测电路和DAC电流控制电路；所述ADC电压侦测电路对LED灯串负端的电压值Vled进行侦测，并将测得的LED灯串负端的电压值Vled转变成电压数值编码；所述DAC电流控制电路
Bibliography:Application Number: CN202111540121