10-Bit Current Driver LSI for Large-Size and High-Resolution Active Matrix Organic Light Emitting Diode Displays

We present the 10-bit current driver LSI with 2-set current digital-to-analog converters (DACs) and output channel current sample and hold (S/H) circuits for large-size and high-resolution active matrix organic light emitting diode (AMOLED) display applications. This current driver LSI has 300 output channels and the output current ranges from 0 μA to 290 μA. The maximum output current level can be controlled by 2-bit control signals because the maximum output current level depends on display size and resolution. The chip was fabricated using 0.65 μm BiCMOS process and characterized. The chip size is 16.8 mm x 3.6 mm. Experimental results show that the output current DNL is less than 0.4 LSB and that INL is less than 1.5 LSB. This is good enough to apply 15.5 inch WXGA (1280 x RGB x 768) AMOLED displays.