Computer graphics processing and selective visual display system – Computer graphics processing – Graphic manipulation
Reexamination Certificate
1998-10-21
2001-10-30
Hjerpe, Richard (Department: 2774)
Computer graphics processing and selective visual display system
Computer graphics processing
Graphic manipulation
C345S087000, C345S098000
Reexamination Certificate
active
06310628
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image display drive apparatus, and more particularly to an image display drive apparatus capable of sequentially driving a plurality of pixels two-dimensionally disposed on a display device.
2. Related Background Art
There is a method of driving a display device such as a liquid crystal display device having pixels disposed in a matrix shape, by driving a plurality of pixels at the same time, e.g., four pixels, two in the horizontal direction and two in the vertical direction. As compared to a method of driving pixels one pixel after another, the method of driving a plurality of pixels at the same time can provide a longer pixel drive time. Even a display device taking a long pixel drive time can display image signals of a high pixel frequency. As a means for shifting an image in the horizontal or vertical direction, there is a method of shifting the timings of a pixel drive signal relative to an image signal input to the display device.
With the above-described conventional method, however, since a plurality of pixels are driven at the same time, it is necessary to supply the display device with image signals for a plurality of pixels at the same time.
Therefore, with the method of changing the timing of a pixel drive signal relative to the image signal in order to shift image signals in the horizontal or vertical direction, the image signals can be shifted only in the unit of a plurality of pixels input at the same time.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an image display drive apparatus capable of shifting an image signal in the unit of one pixel in the horizontal and vertical directions, even for a display device such as a liquid crystal display whose plurality of pixels are driven at the same time.
In order to achieve the above object of the invention, the image display drive apparatus comprises signal processing means for outputting a plurality of pixel signals at the same time, delay means for delaying the pixel signal, and select means for selecting one of the pixel signals and delayed signals.
According to an embodiment of the invention, each time a select signal is cyclically incremented by 1, the select means selects (1) a signal corresponding to a pixel adjacent to a pixel in an image, (2) a signal corresponding to a left adjacent pixel in the image, or (3) a signal corresponding to an upper adjacent pixel in the image.
According to another embodiment of the invention, in order to drive a plurality of adjacent pixels at the same time, the image display drive apparatus has signal processing means for outputting a plurality of adjacent pixel signals at the same time, delay means for delaying at least one of the plurality of pixel signals output from the signal processing means, and select means for selecting pixel signals for driving the display device at the same time, from the outputs of the signal processing means and delay means.
According to another embodiment of the invention, in order to drive a plurality of pixels at the same time, the image display drive apparatus has signal processing means for outputting a plurality of pixel signals at the same time, delay means for delaying at least one of the plurality of pixel signals output from the signal processing means, select means for selecting pixel signals to be output from two or more multiplexers supplied with the outputs of the signal processing means and delay means, and a display device to be driven with the outputs of the two or more multiplexers at the same time.
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Matsushita Akihiro
Sakashita Yukihiko
Canon Kabushiki Kaisha
Eisen Alexander
Fitzpatrick ,Cella, Harper & Scinto
Hjerpe Richard
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