Method of driving active matrix electro-optical device by using forcible rewriting
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsJun Koyama, Yasuhiko Takemura
Life of this patent
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Abstract
Power consumption is reduced by decreasing the frequency of image rewriting to pixels in displaying images which have a portion of a screen that does not vary between frames. On the other hand, to cope with the phenomenon that image information (for instance, pixel voltages) deteriorates over time, a refresh operation is performed regularly. Interlaced scanning is performed skipping a plurality of rows. The refresh operation is performed over several frames in which part of the rows are refreshed in one frame. A flicker is thus prevented which occurs when the entire screen is refreshed in one frame.
Claims23
A method of driving an active matrix type electro-optical device comprising the steps of:
- dividing all of rows into N groups each consisting of m rows;
- and
- subjecting a first row of each group to forcible rewriting in a first frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected with a pixel electrode and provided in each of pixels provided on said first row in said first frame;
- subjecting a second row of each group to forcible rewriting in a second frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected with a pixel electrode and provided in each of pixels provided on said second row in said second frame;
- and
- subjecting a third row of each group to forcible rewriting in a third frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected with a pixel electrode and provided in each of pixels provided on said third row in said third frame.
A method of driving an active matrix type electro-optical device comprising the steps of:
- dividing all of rows into N groups each consisting of m rows;
- and
- subjecting a kth row of each group to forcible rewriting in a kth frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected with a pixel electrode and provided in each of pixels provided on said kth row in said kth frame where k=1, 2, 3, . . . , m.
A method of driving an active matrix type electro-optical device comprising the steps of:
- dividing all of rows into N groups each consisting of m rows;
- subjecting a first row of each group to forcible rewriting in a first frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected with a pixel electrode and provided in each of pixels provided on said first row in said first frame;
- and
- subjecting said first row of each group to forcible rewriting in an (m+1)th frame by applying a scanning signal to said gate electrode of said at least one transistor in said (m+1)th frame.
A method of driving an active matrix type electro-optical device comprising the steps of:
- dividing all of rows into N groups each consisting of m rows;
- and
- subjecting a first row of each group to forcible rewriting in a first frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected in series with a nematic liquid crystal and a pixel electrode and provided in each of pixels provided on said first row in said first frame;
- subjecting a second row of each group to forcible rewriting in a second frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected in series with a nematic liquid crystal and a pixel electrode and provided in each of pixels provided on said second row in said second frame;
- and
- subjecting a third row of each group to forcible rewriting in a third frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected in series with a nematic liquid crystal and a pixel electrode and provided in each of pixels provided on said third row in said third frame.
A method of driving an active matrix type electro-optical device comprising the steps of:
- dividing all of rows into N groups each consisting of m rows;
- and
- subjecting a kth row of each group to forcible rewriting in a kth frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected in series with a nematic liquid crystal and a pixel electrode and provided in each of pixels provided on said kth row in said kth frame where k=1, 2, 3, . . . , m.
A method of driving an active matrix type electro-optical device comprising the steps of:
- dividing all of rows into N groups each consisting of m rows;
- subjecting a first row of each group to forcible rewriting in a first frame by applying a scanning signal to a gate electrode of at least one transistor having a terminal connected in series with a nematic liquid crystal and a pixel electrode and provided in each of pixels provided on said first row in said first frame;
- and
- subjecting said first row of each group to forcible rewriting in an (m+1)th frame by applying a scanning signal to said gate electrode of said at least one transistor.
Dependencies are inferred from the claim text.