专利详情

专利名称	Display drive with permutation and superposition gray-level control
申请号	US201013517929	专利类型	US
公开（公告）号	US9019322(B2)	公开（授权）日	2015.04.28
申请（专利权）人	中国科学院长春光学精密机械与物理研究所	发明（设计）人	Ding Tiefu;Wang Ruiguang;Zheng Xifeng;Chang Feng
主分类号	G09G5/10	IPC主分类号	G09G5/10;G09G3/20;G09G3/32
专利有效期	Display drive with permutation and superposition gray-level control 至Display drive with permutation and superposition gray-level control	法律状态
说明书摘要	A display driver circuitry with permutation and superposition gray-level control comprises a gray-level controller. The controller may comprise a permutation and superposition adder configured to divide N-bit gray-level data G into M most significant bits, serving as a superposition reference GH, and (N?M) least significant bits, serving as a superposition increment GL, and to superpose superposition values Xi onto GH to derive pieces of scan data Gi for S scan operations; an overflow bit setting unit configured to set an overflow bit F; and an output unit configured to output the scan data Gi. A display driven this way has an improved refreshing frequency with the same gray-level reproduction ability as PWM-based schemes. Further, the duration of each scan operation, or scan period, is constant, resulting in convenience in software implementations. Furthermore, the pulse width representative of the gray-level value is determined by superposition of the scan operations.