Color display device
AssigneeU.S. Philips Corporation
InventorMartinus V. C. Stroomer
Life of this patent
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Abstract
In a color display device color elements (17, 18, 19, 21, 22, 23) are built up with the aid of picture cells (2) from juxtaposed rows of picture cells which are driven by line electrodes (3). The resolving power in the horizontal sense is increased by building up the color elements from picture cells of different rows of picture cells. The period t.sub.1 which is required for driving a color element is split up into sub-periods 1/2t.sub.1 during which period samples of the signal to be displayed (length t.sub.o) are presented to the column electrodes (4). Since notably for LCD-TV there applies that t.sub.1 >t.sub.o, these samples can be presented during a period which is longer than 1/2t.sub.o.
Claims20
A display device for color display comprising
- an electro-optical medium,
- a pattern of line electrodes crossing a pattern of column electrodes to provide display elements in a matrix of picture cells of said electro-optical medium,
- wherein at least two adjacent rows of said picture cells constitute a row of N color elements,
- first means for driving said line electrodes,
- conversion circuit means for sampling incoming signals having a length of t.sub.0, said incoming signals being displayed at a frequency of f.sub.0 =N/t.sub.0, and said conversion circuit means converting each of said incoming signals into at least two sampling signals applied to said column electrodes during a display period of t.sub.1, where t.sub.1 >t.sub.0,
- wherein only one of said two sampling signals is applied to said column electrodes during driving of a line electrode associated with at least one row of said picture cells, said line electrode being energized during a period of at most 1/2t.sub.1.
Dependencies are inferred from the claim text.