Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-08-14
2001-10-23
Hjerpe, Richard (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S156000, C345S213000, C345S098000
Reexamination Certificate
active
06307531
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a liquid crystal display apparatus that displays a picture employing a liquid crystal cell matrix, and more particularly to a liquid crystal display apparatus wherein the liquid crystal cell matrix is driven with driving integrated circuits (D-ICs) arranged in a single bank form.
2. Description of the Prior Art
Generally, a liquid crystal display apparatus displays pictures for video signals by controlling the light transmissivity of a liquid crystal. To this end, the conventional liquid crystal display apparatus includes a liquid crystal panel having picture elements or pixels arranged in a matrix form, and driving integrated circuits (D-ICs) for driving the pixel matrix defined on the liquid crystal panel. Each pixel arranged in the matrix form consists of liquid crystal cells and thin film transistors (TFTs). The D-ICs are arranged on the liquid crystal panel in a double bank form to divisionally drive the pixel matrix. More specifically, one side bank of the D-ICs drives odd-numbered pixels while the other side bank thereof drives even-numbered pixels. Accordingly, video data are divided into two groups in accordance with locations of pixels and supplied to the two D-IC banks.
For example, the conventional liquid crystal display apparatus having D-ICs arranged in a double bank form, hereinafter referred to as “double bank liquid crystal display apparatus,” takes a configuration as shown in FIG.
1
. Referring to
FIG. 1
, first and second D-IC banks
12
and
14
are spatially arranged in the upper portion and the lower portion of a liquid crystal panel
10
, respectively. The first D-IC bank
12
drives odd-numbered pixels, i.e., first red and blue color pixels, and a second green color pixel, of the pixels contained in a pixel matrix
16
spatially arranged in the center of the liquid crystal panel
10
. Similarly, the second D-IC bank
14
drives even-numbered pixels, i.e., a first green pixel, and second red and blue pixels, of the pixels contained in the pixel matrix
16
. To this end, video signals are formatted into a first bank data group including odd-numbered red and blue pixel data and even-numbered green pixel data, and a second bank data group, including odd-numbered green pixel data and even-numbered red and blue pixel data.
The double bank liquid crystal display apparatus as mentioned above has a disadvantage in that an effective field area, that is, an area occupied by the pixel matrix
16
, is reduced because the two D-IC banks
12
and
14
occupy a large area. In other words, the apparatus has a disadvantage in that it requires a larger glass substrate for use in the liquid crystal panel.
As an alternative for solving such a disadvantage in the double bank liquid crystal display apparatus, there has been suggested a single bank type liquid crystal display apparatus in which D-ICs are spatially arranged in one side of the liquid crystal panel. In the single bank liquid crystal display apparatus, as shown in
FIG. 2
, the liquid crystal panel
20
includes a D-IC bank
22
having D-ICs, not shown, arranged in a line, and a pixel matrix
24
driven with the D-IC bank
22
. The D-IC bank
22
includes first to sixth data buses DL
1
to DL
6
to drive the pixel matrix
24
with the video data configured for the double bank form. The D-IC bank
22
receives from the first to sixth data buses DL
1
to DL
6
six pixel data for displaying 6 adjacent pixels in every clock period. In other words, as shown in
FIG. 3
, the D-IC bank
22
receives 6 pixel data to be displayed for the first red pixel, first green pixel, first blue pixel, second red pixel, second green pixel and second blue pixel in the first clock period, and receives 6 pixel data to be displayed for third red pixel, third green pixel, third blue pixel, fourth red pixel, fourth green pixel and fourth blue pixel in the second clock period.
In order to process 6 pixel data to be displayed for 6 adjacent pixels in a single clock period, two D-ICs must be simultaneously driven. This results in a complication in the wiring between the D-ICs and the pixel matrix as well as a difficulty in an enhancement of effective display area in the liquid crystal panel. In other words, the single bank liquid crystal display apparatus shown in
FIG. 2
is incapable of reducing the size of liquid crystal panel below a certain limit.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a liquid crystal display apparatus having D-ICs arranged in a single bank form that is adapted to respond to video data signal bank form while enlarging the effective display area thereof.
Further object of the present invention is to provide a liquid crystal display apparatus having D-ICs arranged in a single bank form that is adapted to respond to a high rate video data signal for double bank while enlarging the effective display area thereof.
In order to achieve these and other objects of the invention, a liquid crystal display apparatus according to one embodiment of the present invention comprises a pixel matrix having pixels arranged on a liquid crystal panel in a matrix form, first input means for sequentially receiving odd-numbered pixel data to be displayed on odd-numbered pixels of the pixels contained in the pixel matrix, second input means for sequentially receiving even-numbered pixel data to be displayed on even-numbered pixels of the pixels contained in the pixel matrix, a plurality of driving circuits, arranged in parallel, for driving the pixels contained in the pixel matrix in line units, and for divisionally driving pixels for one line in a certain number of pixel units arranged successively, and means for sequentially rearranging odd-numbered pixel data from the first input means and even-numbered pixel data from the second input means, and for supplying the rearranged pixel data to the plurality of driving circuits.
A liquid crystal display apparatus according to another embodiment of the present invention comprises a pixel matrix having pixels arranged on a liquid crystal panel in a matrix type, first input means for sequentially receiving odd-numbered pixel data to be displayed on odd-numbered pixels of the pixels contained in the pixel matrix, second input means for sequentially receiving even-numbered pixel data to be displayed on even-numbered pixels of the pixels contained in the pixel matrix, a plurality of driving circuits, arranged in parallel, for driving the pixels contained in the pixel matrix in line units, and for divisionally driving pixels for one line in a certain number of pixel units arranged successively, means for sequentially rearranging odd-numbered pixel data from the first input means and even-numbered pixel data from the second input means, and for supplying the rearranged pixel data to the plurality of driving circuits, and block driving means for dividing the rearranged pixel data from the rearranging means a plurality of block data corresponding to the number of driving circuits, and for distributively supplying the plurality of block data, via at least two transfer paths, to at least two group of driving circuits simultaneously.
REFERENCES:
patent: 5719591 (1998-02-01), Callahan, Jr. et al.
patent: 5790096 (1998-08-01), Hill, Jr.
patent: 5796379 (1998-08-01), Enomoto et al.
patent: 5856818 (1999-01-01), Oh et al.
Hjerpe Richard
LG. Philips LCD Co. Ltd.
Long Aldridge & Norman LLP
Nguyen Francis
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