【作者】 赵博生；

【导师】 时龙兴；

【作者基本信息】 东南大学 ， 微电子学与固体电子学， 2005， 硕士

【摘要】 针对手持设备SOC(System On a Chip)芯片中彩色液晶显示方面的挑战,本文研究并解决了彩色液晶显示方面的两个问题:高性能兼容YUV数据的LCDC(LCD Controller)和低功耗液晶背光动态控制技术。文章首先介绍了Garfield芯片的整体架构以及两种颜色空间。在现有的Garfield基础之上,提出了兼容YUV数据的LCDC,以此提高MPEG4的解码性能。文章提出了两种转换电路实现方法,对其中的实现原理、实现方法和电路结构作了详细的介绍,并给出了两种电路的性能评估。在此基础上,论文详细论述了兼容YUV数据的LCDC的实现方法,并对LCDC的性能作了评估。为了降低显示子系统的功耗,文章提出了两种动态背光控制技术:动态背光补偿技术与图像增强技术,并且论述了两种技术的原理。为了降低实现复杂度,文章提出了改进的亮度补偿与图像增强方法,分别给出了软件实现方法和硬件实现方法的分析。最后对两种动态背光控制技术作了评估,给出了应用两种技术后的图像以及相应的背光功耗降低程度。本文在Garfield芯片LCDC的基础上完成了兼容YUV数据格式的LCDC的优化设计,使得MPEG4的解码性能提高近40%。在保证图像质量的前提下,运用两种动态背光控制技术,使得背光功耗降低30%至50%。更多还原

【Abstract】 When we develop the Garfield which is a chip used in handheld device, we encounter some design challenge in color LCD display. In this paper, we introduce two methods to optimize our design, one is LCDC optimization, another is dynamic backlight control technique.At first, the author introduce some background technology, such as the architecture of Garfield and two color space. Then the author optimize the LCDC by integrating the YUV to RGB convert circuit in LCDC. In the paper, the optimization technique is described and the evaluation is given. In order to reduce the power consumption of the display system, we bring forward two dynamic backlight control methods, one is dynamic backlight compensation, another is histrogram equalization. The theory of the technique and how to implement is described in the paper. At last we give the simulation results of the picture.By now, we have completed the optimization of LCDC. By integrating the convert circuit, the performance of MPEG4 decoding is improved by nearly 40%. And though two dynamic backlight control methods, the power consumption is greatly reduced. Using dynamic backlight control, we can reduce about 30% power consumption of the backlight.更多还原