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设计了一款用于驱动分辨率为800×600的OLED微显示器的驱动芯片,利用10位的DAC将数字视频信号转成模拟信号,然后经过两个8位DAC实现数据的偏压和增益调整,可以适应微显示器在不同环境下对亮度和对比度的需要。像素电路采用了改进型的电压型驱动方式,能够在较宽的OLED公共阴极电压范围内维持很大的电流比率。该电路采用0.35μm 2P4M混合信号工艺完成了设计,进行了流片验证,已在芯片表面成功制作了OLED阵列,实现了微显示器的静态和动态画面显示,微显示器亮度可达11 000cd/m2,在此条件下,对比度可达到10 000∶1。
A driver IC for driving an OLED microdisplay with a resolution of 800 × 600 is designed. The digital video signal is converted into an analog signal by using a 10-bit DAC, and then data bias and gain adjustment are performed through two 8-bit DACs , Can adapt to the needs of the microdisplay brightness and contrast in different environments. The pixel circuitry incorporates an improved voltage-mode driver that maintains a large current ratio over a wide range of OLED cathode voltages. The circuit adopts 0.35μm 2P4M mixed signal technology to finish the design and verify the chip. The OLED array has been successfully fabricated on the surface of the chip to achieve the static and dynamic picture display of microdisplay. The brightness of microdisplay can reach 11000cd / m2, Under these conditions, the contrast ratio can reach 10 000: 1.