JSSC 2006第12期Other0.18μm CMOS

A Current-Mode Display Driver IC Using Sample-and-Hold Scheme for QVGA Full-Color AMOLED Displays Jong Hak Baek, Myunghee Lee, Jae Hoon Lee, Han Su Pae, Chang Ju Lee, Jin Tae Kim, Chang Sik Choi, Hong Kwon Kim, Tae Jin Kim, and Ho

一款用于QVGA AMOLED显示器的电流模式驱动IC，采用采样保持方案。

720通道输出，8位分段DAC，10nA至10mA输出范围

电流模式驱动QVGAAMOLED采样保持Gamma校正

▸创新点1：电流吸收驱动方案（方法创新） - 该方案通过精确控制电流吸收来实现对AMOLED像素的驱动，解决了传统电压驱动方案中的亮度不均匀问题，支持10nA至10mA的宽范围电流输出，显著提升了显示均匀性和能效比。

▸创新点2：采样保持技术在源驱动块中的应用（电路创新） - 在源驱动块中采用采样保持技术，有效减少了信号传输过程中的噪声干扰，确保了64级灰度输出的稳定性，同时降低了功耗，适用于高分辨率QVGA显示。

▸创新点3：64级灰度Gamma校正（系统创新） - 通过8位分段DAC实现64级灰度选择（从256级中），结合Gamma校正技术，优化了显示色彩的准确性和平滑度，提升了视觉体验，特别适用于全彩AMOLED显示。

▸创新点4：0.18μm CMOS工艺集成高压晶体管（工艺创新） - 采用0.18μm CMOS工艺集成5.3V高压晶体管，实现了驱动IC的高集成度和低功耗，同时支持高电压操作，适用于低温多晶硅（LTPS）面板的驱动需求。

Abstract

A display driver IC based on a current-sink driving scheme has been developed for QVGA (240 320), low-temper- ature poly-silicon (LTPS) active matrix organic light-emitting diodes (AMOLEDs) displays. The current-mode driver IC con- sists of a source driver block and a controller block. It uses a sample-and-hold scheme in the source driver block. The source driver block has 720 channel outputs, an 8-bit segmented DAC, a pre-charge generation block, and a 64-level gray scale (64 selec- tions out of 256 gray levels for Gamma correction) per channel. The source driver output current ranges from 10 nA to 10 m. The controller block generates control signals for the source driver and LTPS drivers (emission and scan driver), which are integrated on the panel glass. The current-mode driver IC was fabricated in a 0.18- m CMOS technology (two poly and four metals) with 5.3-V high-voltage transistor devices.