Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
2001-11-23
2004-11-30
Mengistu, Amare (Department: 2673)
Computer graphics processing and selective visual display system
Display driving control circuitry
C345S205000
Reexamination Certificate
active
06825835
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device having a display section including sub-pixels arranged in a delta configuration, and to a technique for increasing display resolution and the like.
2. Description of the Background Art
In many cases, matrix displays having pixels (or picture elements) arranged in a matrix have employed trio arrangement pixels.
FIG. 39
is a schematic (plan) view for illustrating the trio arrangement pixels. As shown in
FIG. 39
, a trio arrangement pixel P is substantially square in shape, and comprises three strip-shaped sub-pixels (or cells) C: a sub-pixel C for red (R), a sub-pixel for blue (B), and a sub-pixel for green (G). The three sub-pixels C extend in a column direction v of a display and are arranged in a row direction h perpendicular to the column direction v.
In general, the trio arrangement pixels are low in resolution considering the number of pixels, but have good linearity in the row direction h and in the column direction v. Therefore, the trio arrangement pixels are suitable for graphic drawing. Additionally, the trio arrangement pixels can display a video image with natural texture. The video image refers to an image produced by optically capturing a subject using a video camera and the like.
FIG. 40
is a schematic (plan) view for illustrating a plasma display panel (also referred to hereinafter as a “PDP”)
500
having the trio arrangement pixels. The PDP
500
basically comprises a glass container including a front glass substrate and a rear glass substrate which are disposed in face-to-face relationship, with a discharge gas filling the interior of the container (or a discharge space). The PDP
500
shown in
FIG. 40
is an alternating current (AC) PDP.
A plurality of strip-shaped metal electrodes or bus electrode
501
are formed on the front glass substrate and extend in the row direction h. The plurality of bus electrodes
501
are in pairs, and a strip-shaped black stripe
504
is formed between adjacent pairs of the bus electrodes
501
. The black stripes
504
decrease an extraneous light reflectance to improve contrast. Transparent electrodes
502
in contact with each of the bus electrodes
501
overhang in the opposite direction from the black stripes
504
. The transparent electrodes
502
in contact with one of each pair of bus electrodes
501
are opposed to the transparent electrodes
502
in contact with the other thereof, with a discharge gap
503
therebetween. Each of the bus electrodes
501
and the transparent electrodes
502
connected thereto are collectively referred to also as a “row electrode” hereinafter. A pair of row electrodes X
1
, Y
1
and a pair of row electrodes X
2
, Y
2
are shown in FIG.
40
.
On the other hand, a plurality of strip-shaped column electrodes or address electrodes are formed on the rear glass substrate and extend in the column direction v (thus so as to intersect the bus electrodes
501
(at different levels)). Six column electrodes W
1
to W
6
are shown in
FIG. 40. A
strip-shaped barrier rib (also referred to simply as a “rib” hereinafter)
505
is formed between adjacent ones of the column electrodes on the rear glass substrate. Each rib
505
is formed so as to separate the transparent electrodes
502
adjacent in the row direction h from each other or so as to partition the interior of the glass container. A phosphor
506
R,
506
B or
506
G for red (R), blue (B) or green (G) is formed to cover each of the column electrodes W
1
to W
6
.
A sub-pixel C in the PDP
500
has an area defined by adjacent ones of the barrier ribs
505
and adjacent ones of the black stripes
504
. Three sub-pixels C adjacent in the row direction h and emitting red (R), blue (B) and green (G), respectively, constitute one pixel P (see FIG.
39
).
The PDP
500
which has no ribs extending in the row direction h is easy to manufacture, but must ensure a distance between adjacent electrode pairs to prevent interference of discharge between rows or between sub-pixels C arranged in the column direction v. Thus, the PDP
500
has a display problem such that an image of a slant line, when displayed, appears jagged. This display problem becomes more noticeable when a slant line has a smaller slope with respect to the row direction h or when the PDP
500
has the black stripes
504
.
In general, the AC PDP
500
is driven through a series of operations including a reset operation, an address operation, a display operation (or a sustain operation) and an erase operation. More specifically, the electric charge state in the PDP
500
(i.e., in all discharge cells) is initialized during a reset period (the reset operation).
During an address period, image data is given in the form of the presence/absence of electric charge (or wall charge) into each of the sub-pixels C. More specifically, scan pulses are applied sequentially to the row electrodes Y
1
and Y
2
(or potential differences are applied sequentially between electrode pairs), and application
on-application of address pulses or write pulses to the column electrodes W
1
to W
6
is driven in accordance with data corresponding to the respective sub-pixels C in the image data in synchronism with the sequential application of the scan pulses.
Thereafter, during a display period, repeated discharge (display discharge or sustain discharge) is caused to occur by the use of the wall charge to permit display (the display operation). In this operation, the luminance of each sub-pixel C is controlled by the number of times the discharge is repeated during the display period. During an erase period, the wall charge is erased (the erase operation).
The PDP
500
is capable of representing gradation levels using a driving method referred to as a sub-field gradation (or tone) method (or simply as a sub-field method). In the sub-field gradation method, one sub-field (SF) is formed including the reset operation, the address operation, the display operation and the erase operation, and a plurality of sub-fields are combined together to form one frame (or field). The display periods of the respective sub-fields are made different from each other in the number of times the display discharge is repeated.
FIGS. 41 and 42
are schematic (plan) views for illustrating a PDP
550
having delta arrangement pixels.
FIGS. 41 and 42
are disclosed in Proceedings of The 6th International Display Workshops, 1999, p. 599. Like the PDP
500
of
FIG. 40
, the PDP
550
comprises row electrodes X, Yn−1, Yn, Yn+1, column electrodes W
1
to W
11
, and the like. Ribs
555
in the PDP
550
extend in the column direction v while meandering. Because of the shape of the ribs
555
, three sub-pixels C constituting one pixel P (see the triangles indicated by broken lines in
FIG. 42
) in the PDP
550
are disposed to define a triangle. A plurality of pixels P in the PDP
550
are arranged in a matrix throughout the panel.
The delta arrangement allows a sub-pixel C serving as a unit for emitting light to be designed to have a greater width than does the trio arrangement, and therefore is advantageous in the PDP from the viewpoint of light emitting efficiency over the trio arrangement having the elongated sub-pixels C. This is because a narrower discharge space of each sub-pixel (or discharge cell) results in greater energy losses of excited particles such as ions and electrons due to collision with the ribs and the like.
The delta arrangement pixels are also used in a small-sized head mounted liquid crystal display (LCD), a low-cost projection LCD, and the like.
The PDP
550
is driven in a similar manner to the PDP
500
of FIG.
40
. More specifically, as shown in
FIG. 41
, scan pulses are applied sequentially to the row electrodes Yn−1, Yn, Yn+1, and the application
on-application of voltages to the column electrodes W
1
to W
11
is driven in accordance with data corresponding to the respective sub-pixels C in image data in synchronism with the sequential application of the scan pulses. A common volta
Harada Shigeki
Sano Ko
Dharia Prabodh M.
Mengistu Amare
Mitsubishi Denki & Kabushiki Kaisha
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