J. Woo, J.G. Lee, K. Y. Chung, W. Kang, S.C. Kim, G. Lee, I. Kang, B.N. Kim
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引用次数: 0
摘要
提出了一种用于低功耗移动TFT-LCD驱动电路的开关控制源放大器(SCSA)。在SCSA方案中，TFT-LCD的源线负载决定了T-LDI中源驱动器的工作。即在分离源线负载时，减少源缓冲器的输出级电流，进行VCOM与源线之间的电荷分担等电流节约操作。采用SCSA方案，在输出缓冲器相裕度允许的情况下，可以减小源缓冲器的所有静态电流。采用5 v /0.8 m三金属CMOS工艺制作了QVGA分辨率的测试芯片，实验结果表明，该芯片功耗节省11%~16%，芯片尺寸开销小于1%。
Switch Controlled Source Amplifier for Low Power Mobile TFT-LCD Driver IC
Switch controlled source amplifier (SCSA) is proposed for low power mobile TFT-LCD driver ICs (T-LDIs). In SCSA scheme, the operation of the source drivers in a T-LDI is determined by the source line load of TFT-LCD. That is, output stage current of source buffers is reduced when the source line load is separated for current saving operation such as charge sharing between VCOM and source lines. With SCSA scheme, all the static current of source buffers can be reduced as far as phase margin of the output buffers is permitted. A test chip was fabricated in a 5-V/0.8-mum triple-metal CMOS process with QVGA resolution, and the experimental results show that the power consumption of 11%~16% was saved with die size overhead less than 1%.
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