Signal line driving circuit and signal line driving method...

Details Signal line driving circuit and signal line driving method... Signal line driving circuit and signal line driving method...

2005-07-05

2005-07-05

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S215000, C345S089000, C345S098000

Reexamination Certificate

active

06914587

ABSTRACT:
In order to attain an electric power saving for a liquid crystal display having a pre-charging unit, a signal line driving circuit according to the present invention is used in an active matrix type of a liquid crystal display, and it is characterized in that it applies a middle potential Vp serving as a pre-charging voltage and a gradation voltage corresponding to a picture data to a plurality of signal lines, and it has a latch11and a comparator12for comparing a picture data before one horizontal period with a picture data to be next displayed for each signal line, and a switch controller13for applying the middle potential Vp in accordance with the result compared by the comparator12, and if a writing operation can be stably carried out at a high speed without any pre-charging operation, the pre-charging operation is not done. Thus, it is possible to reduce a loss of a current necessary for the pre-charging operation.

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