LCD controller to hold a fixed image aspect ratio

Details LCD controller to hold a fixed image aspect ratio LCD controller to hold a fixed image aspect ratio

2007-08-28

2007-08-28

Dinh, Duc (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Adjusting display pixel size or pixels per given area

C345S003300, C345S003400, C345S698000, C348S445000

Reexamination Certificate

active

10428892

ABSTRACT:
A circuit and a method for maintaining the aspect ratio of images when there is a difference in format between image sources and display panels is provided. Lines are added in the vertical direction both at the top and at the bottom of the display panel in order to make the display panel have the same aspect ratio as the input image. A line enable signal is used to expand the vertical lines to maintain aspect ratio. Previously, the period of line enable signals could not be programmed to vary sufficiently to yield the necessary expansion to allow the aspect ratio of the display panel image to match the aspect ratio of the source image. This design allows the period of the line enable signal to vary enough to match all reasonable aspect ratios of input images.

REFERENCES:
patent: 5592194 (1997-01-01), Nishikawa
patent: 5748175 (1998-05-01), Shimada et al.
patent: 5983247 (1999-11-01), Yamanaka et al.
patent: 6097437 (2000-08-01), Hwang
patent: 6191820 (2001-02-01), Kang et al.
patent: 6275306 (2001-08-01), Wataya et al.

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