一种基于改进型存储结构OSD芯片的设计与实现  

The Design and Implementation of OSD IC based on improved Storage Structure

作　　者：李跃辉[1] 

机构地区：[1]南通大学江苏省专用集成电路设计重点实验室,江苏南通226019

出　　处：《中国集成电路》2009年第8期49-53,共5页China lntegrated Circuit

摘　　要：本文针对中低端液晶显示系统,设计了一种基于改进型存储结构的字符型数字在屏显示(OSD)发生器。采用三行三列的邻域运算生成字符边框,改进了现有字符发生器的存储结构,可以在一个时钟周期内同时读取三行字符点阵数据,产生字符边框,避免在芯片内部使用多个时钟,降低芯片设计复杂性。该设计经过FPGA验证和流片测试,工作稳定可靠,已经成功应用于便携式液晶显示DVD播放机和数码相框。The paper designed a font-based digital OSD engine with an improved storage structure based on the middle-end or low-end Liquid Crystal Display （ LCD ） system. The OSD adopts a 3x3 Neighborhood Operation arithmetic to generate the border and shadow of fonts. It improves the storage method of the font lattice, and three lines data of font lattice can fetch synchronously in one clock cycle to avoid using different clock in one design and to reduce the complexity of the chip. Logic functions and characteristic of the OSD engine are verified in FPGA, and the result shows that it can work stably and reliably. The OSD engine has been applied to portable DVD LCD players and Digital Photo Frame successfully.

关 键 词：在屏显示 字符点阵 邻域运算 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]