Abstract ▼ AI-Helper

In this thesis, the area and power efficient 10bit display column driver IC for mobile Quad High Definition Plus(QHD+) resolution is proposed. By optimizing the Unity Gain Bandwidth(UGB) of the output buffer amplifier and applying the high speed Digital to Analog Converter(DAC), proposed display col...

In this thesis, the area and power efficient 10bit display column driver IC for mobile Quad High Definition Plus(QHD+) resolution is proposed. By optimizing the Unity Gain Bandwidth(UGB) of the output buffer amplifier and applying the high speed Digital to Analog Converter(DAC), proposed display column driver IC reduced the number of DAC compared to the conventional display column driver IC by 1/24, the output buffer amplifier by 1/2 and improved the uniformity between channels even in high speed operation by applying the two-stage current source and sink based interpolation structure and resistor-string DAC(R-DAC). Through the proposed method, the effective channel area was implemented at 0.0036mm^2, and the static power consumption per channel was 0.5uA, and the overall output voltage range was between 0.25V and 4.75V. The ICs was fabricated with size of 2.5mm*1mm die size using 0.18um BCD process of digital 1.8V and analog 5V. Overall chip includes one time dividing display column driver IC that 24 channels share one high speed DAC and two channels share one fast settling output buffer amplifier. In addition, one conventional display column driver IC of 12 channels were implemented to verify the effectiveness of the time dividing technique by analyzing Deviation of Output Voltage(DVO).

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