Low power pixel-based visual display device having dynamically c

Details Low power pixel-based visual display device having dynamically c Low power pixel-based visual display device having dynamically c

1995-01-06

1997-11-25

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345 89, 345201, 348790, G09G 500

Patent

active

056917457

ABSTRACT:
An inexpensive, low power visual display device has m n-bit/pixel frame buffers that hold m sets of pixel data, where m>1, and an n-bit controller for switching among the m n-bit/pixel frame buffers at a selected rate during a display cycle. The controller outputs a composite stream of the m sets of pixel data. A display having a matrix of pixels is coupled to the controller to receive the composite stream. The pixels are turned on and off in response to the composite stream of pixel data. Individual pixels have a grayscale shade reflecting an average duration that the individual pixel is on. The visual display device produces m.times.(2.sup.n -1)+1 grayscale shades, including white. The multi-buffer display device can be optimized in a manner which reduces power consumption or increases the number of gray scale colors in comparison to prior art single frame buffer visual display devices. A method for operating visual display devices is also disclosed.

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