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Driver chip performance plays a key role in the display quality of the LED display
 
Driver chip performance plays a key role in the display quality of the LED display

Date£º1/22/2013 7:59:57 PM    Counts£º5176

Driver chip performance plays a key role in the display quality of the LED display


Why drive chip performance plays a key role in the display quality of the LED display? In recent years, with the rapid development of the LED display technology, a special-purpose chip has become mainstream large color LED display driver chips, but there are still some critical issues should be solved, one of the most core number of constant current driver display technology. The precise number of constant current driver decided to color large LED display shows the uniformity, consistency and commercial value.
LED display bias has nothing to do with the power technology design start and bias circuit to improve the power supply rejection ratio and voltage regulation, improve the accuracy of bandgap reference module. Bandgap reference voltage source, the main circuit operational amplifier, chopper modulation circuit and demodulation circuit needs to be pointed out that the chopper modulator, eliminating the input offset voltage of the op amp, and effectively suppress noise of the device. The oscillator generating complementary square wave signal for the chopper modulation and demodulation circuits in the on-off control of the MOS switch, here constituted by an inverter ring oscillator, and for shaping a square wave through an inverter, and to ensure that the the quality of the output of the signal, while reducing the chip area. The output terminal of the operational amplifier is connected to an RC low-pass filter to eliminate the effects of noise. The current mirror bias current of other circuit module, the degree of bias MOS transistor current source directly from the output voltage of the bandgap reference voltage source, improved temperature stability, and reduce the transfer bias voltage traces interference.