Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-06-17
2001-11-27
Hjerpe, Richard (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S092000, C345S094000, C345S098000, C345S100000, C345S103000
Reexamination Certificate
active
06323835
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a device for supplying polyphase image signals to a liquid crystal displaying apparatus.
Image signals to be displayed are converted into polyphase signals of N-phases (N being a natural number of 2 or more) and supplied to a liquid crystal displaying apparatus. An image signal of each phase has an occupied bandwidth corresponding to 1/N of that of the original image signals.
The polyphase signals are supplied to an active-matrix liquid crystal displaying apparatus with switching transistors, such as, thin film transistors (TFT) and MOS transistors, provided on intersections of signal electrodes (lines) and scanning electrodes.
The switching transistors switch a voltage supplied to each pixel to separate two-dimensionally arranged pixels for non-crosstalk driving if memory devices for holding voltages corresponding to image signal per pixel reveal low frequency characteristics or the switching transistors reveal low switching response.
When projecting an image onto a screen by a projection-type displaying apparatus, the displaying apparatus may be set on the screen's front or back side. The image is reversed in a horizontal direction of the screen when projected on the back side, for example.
An image projected onto a screen by an active-matrix liquid crystal displaying apparatus supplied with single phase image signals can be reversed by switching a shifting direction of a horizontal shift register of a horizontal driver of the displaying apparatus.
On the other hand, if the active-matrix liquid crystal displaying apparatus is supplied with polyphase image signals, such shifting direction switching reverses an order of arrangement of pixels group, the number of pixels in each group corresponding to the number of phases of the image signals, however, not an order of arrangement of pixels in each group. A normal image thus cannot be displayed on the screen.
A device for supplying polyphase image signals to the active-matrix liquid crystal displaying apparatus thus requires reversing the order of arrangement of pixels in each group for applicability in image projection on the screen from both the front and back sides.
However, such a device is fabricated into a one chip IC with a lot of data input/output terminals and signal switching circuitry, that is, a costly large scale one chip IC.
On the other hand, such a device with a plurality of ICs requires data communications among the ICs for image switching in a horizontal direction of a screen. Many costly data input/output terminals are thus required per IC.
SUMMARY OF THE INVENTION
A purpose of the present invention provides a device for generating polyphase image signals capable of reversing the order of the image signals with less circuitry and data input/output terminals.
Another purpose of the present invention is to provide an image displaying apparatus with a liquid crystal display and such a device for supplying polyphase image signals to the liquid crystal display.
The present invention provides a device for generating polyphase image signals comprising: latch means for latching original polyphase image signals of a first to an N-th phase original image signal, N being a natural number of two or more; and a selector connected to the latch, to select the original polyphase image signals in a first order from the first to the N-th phase original image signal or a second order from the N-th phase to the first original image signal, to output the selected polyphase image signals.
The present invention further provides an image displaying apparatus comprising: a liquid crystal display with pixel electrodes arranged in a matrix, the pixel electrodes being divided into M groups of a first to an M group in a horizontal direction of the matrix, each group having N pixel electrodes, M being a natural number of one or more, N being a natural number of two or more; a generator to generate polyphase image signals to be displayed, the polyphase image signals having a first to an N-th phase image signal; a driver to drive the liquid crystal display in response to the polyphase image signals, the polyphase image signals being selectively supplied to the liquid crystal display in a first order from the first to the N-th phase image signal, the N pixel electrodes in each group being activated in order from the first to the M-th group or in a second order of from the N-th to the first phase image signal, the pixel electrodes in each group being activated in order from the M-th to the first group.
REFERENCES:
patent: 5530457 (1996-06-01), Helgeson
patent: 5543824 (1996-08-01), Priem et al.
patent: 5764212 (1998-06-01), Nishitani et al.
patent: 5900856 (1999-05-01), Iino et al.
patent: 06342272A (1994-12-01), None
patent: 09127919A (1997-05-01), None
Negishi Ichiro
Uchiyama Yuji
Hjerpe Richard
Jacobson & Holman PLLC
Lesperance Jean
Victor Company of Japan Ltd.
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