← 返回 JSSC 论文列表JSSC 2014第10期Data Converters0.35μm/0.5μm
A Column Driver Architecture With Double Time-Division Multiplexing RDACs for TFT-LCD Applications
提出一种双时分复用RDAC的TFT LCD列驱动架构，提升线性度和均匀性。
0.35μm/0.5μm CMOS, 18.2 MSPS, 0.017 mm²/channel
TFT LCD列驱动时分复用RDAC准自举开关
▸创新点1：双时分复用RDAC技术（方法创新） - 通过双重时间分割复用技术显著提高电阻串数模转换器(RDAC)的转换效率，平均数据转换速率达到18.2 MSPS，同时减少芯片面积至每通道0.017 mm²，解决了传统架构在高速与面积效率上的矛盾。
▸创新点2：准自举开关设计（电路创新） - 采用准自举开关连接DAC与输出缓冲器，有效改善数模转换器的线性度（DNL/INL ≤0.79 LSB）和列驱动器的输出均匀性，克服了传统开关的非线性失真问题。
▸创新点3：回踢噪声动态补偿机制（系统创新） - 通过双时分复用操作主动补偿输出缓冲器产生的回踢噪声，提升显示驱动信号的稳定性，尤其适用于高分辨率TFT-LCD面板的驱动需求。
▸创新点4：无低温多晶硅TFT的采样保持架构（工艺创新） - 利用单行采样保持电路作为复用器，实现高复用比设计，避免依赖显示面板上的低温多晶硅TFT技术，降低了制造成本和工艺复杂度。
Abstract
This study proposes a thin- film-transistor (TFT) liquid crystal display (LCD) column driver architecture with double time-division multiplexi ng (TDM) resistor-string dig- ital-to-analog converters (RDA Cs). A row of sample-and-hold circuits is used as a multiplexer to obtain a high multiplex ratio without requiring low temperature polysilicon TFTs on the display panel. The double TDM operation is proposed to compensate for the kickback noise produced by the output buffer. To improve the linearity of the DAC and the uniformity of the column driver, quasibootstrapped switches are u s e di nt h em u l t i p l e x e rt oc o n n e c t the DACs and output buffers. The column driver prototype was implemented by using 0.35 m/0.5 m CMOS technology with a worst positive-polarity di fferential nonlinearity/integral nonlinearity (DNL/INL) of 0.77/0.77 LSB and a negative-polarity DNL/INL of 0.79/0.79 LSB. The average data conversion rate of the RDAC is 18.2 MSPS and the die area per channel is only 0.017 mm .