Analysis and Design of LED Backlight Hardware Circuit for Liquid Crystal Vehicle Instrument
In order to keep the steady output current and brightness of the backlight of liquid crystal vehicle instrument under the condition of external electrical interference,three kinds of LED backlight circuits that have been used were studied and analyzed.And a hardware circuit design with high stability,namely the LED con-stant current source circuit,was proposed.The circuit can adjust the brightness of LED backlight by adjusting the precision resistance value.The design is simple,the current adjustment is convenient,and the cost is low.It has high application value in the vehicle instrument market.
Liquid crystal vehicle instrumentLED backlightTransient suppression diodeConstant current source
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