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A 10-bit 1026-Channel Column Driver IC With Partially Segmented Piecewise Linear Digital-to-Analog Converters for UHD TFT-LCDs With One Billion
一款10位1026通道列驱动IC，采用部分分段线性DAC，提升超高清液晶显示色彩深度。
10-bit分辨率, 1026通道, 最大输出偏差16mV, 18.14mm×1.2mm芯片尺寸, 5.6μs建立时间
列驱动IC数模转换器液晶显示gamma校正运算放大器
▸创新点1：部分分段线性DAC（方法创新） - 采用部分分段线性数字模拟转换器（DAC）设计，有效提升色彩深度并保持高精度，最大输出偏差电压仅为16 mV，显著优于传统线性DAC的精度限制。
▸创新点2：面积高效双电压选择器（电路创新） - 通过优化双电压选择器电路结构，大幅减少芯片面积，使得1026通道的列驱动IC芯片尺寸仅为18.14 mm × 1.2 mm，实现了高集成度与低成本。
▸创新点3：DAC嵌入式gm调制运算放大器（系统创新） - 将gm调制运算放大器嵌入DAC中，结合线性增强差分对技术，显著提升输出信号的线性度与稳定性，最大建立时间仅为5.6 μs（5 kΩ负载，300 pF电容）。
▸创新点4：嵌入式2-4解码器电平转换器（电路创新） - 集成2-4解码器与电平转换功能，简化信号路径并降低功耗，同时支持多电压域操作，增强了系统的兼容性与灵活性。
Abstract
A 10-bit 1026-channel column driver IC with partially segmented piecewise linear digital-to-analog convert- ers (DACs) was designed, simulated, and prototyped. This device is intended to improve the color depth of ultra-high-definition thin-film transistor liquid-crystal displays. The proposed column driver can output a precise gamma-corrected transfer curve without any loss of effective bit resolution. The overall chip area of the driver IC is minimized by including an area-efficient two-voltage selector, a 2-to-4 d ecoder embedded level shifter, and a DAC-embedded g m-modulation operational amplifier with linearity-enhanced differential pairs. A maximum inter-chip devi- ation voltage of output (DVO) of 16 mV was measured from five of the proposed column-driver ICs. The die dimensions of the 1026-channel column driver IC are of only 18.14 mm × 1.2 mm. The maximum settling time of the prototype is 5.6 μsw h e n driving a load with 5-k resistance and 300-pF capacitance within 10-mV tolerance of the final voltage.