Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2000-06-22
2003-09-30
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S076000, C345S080000, C345S087000, C345S100000, C345S204000, C345S205000, C345S206000, C315S169300
Reexamination Certificate
active
06628258
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a substrate for an electrooptical device, and, more particularly, to a substrate for an electrooptical device appropriate for use in a reflective electrooptical device.
BACKGROUND ART
A “light valve” in this description represents a transmissive light modulator element or a light-reflective light modulator element
The applicant of this application has disclosed a substrate for a liquid-crystal display panel, the liquid-crystal display panel, and a projection display apparatus, to be discussed below, in Japanese Patent Application 8-279388 filed Oct. 22, 1996.
Referring to
FIG. 18
, a projection display apparatus (a liquid-crystal display projector) using a reflective liquid-crystal display panel as a light valve includes, in a system optical axis L
0
, a polarizing illumination device
1100
mainly composed of a light source unit
1110
, an integrator lens
1120
, and a polarizer element
1130
, a polarizing beam splitter
1200
which reflects an S-polarized light exiting from the polarizing illumination device
1100
from an S-polarized light reflecting surface
1201
, a dichroic mirror
1412
which separates a blue light (B) component from the light beam reflected from the S-polarized light reflecting surface
1201
of the polarized light beam splitter
1200
, a reflective liquid-crystal display light valve
1300
B for modulating the separated blue light (B), a dichroic mirror
1413
for reflecting a red light (R) component of the light from which the blue light has been separated through the dichroic mirror
1412
, a reflective liquid-crystal display light valve
1300
R for modulating the separated red light (R), a reflective liquid-crystal display light valve
1300
G for modulating the remaining green light (G) transmitted through the dichroic mirror
1413
, and a projection optical system
1500
including a projection lens. Light beams modulated through the three reflective liquid-crystal display light valves
1300
R,
1300
G, and
1300
B are directed in the opposite directions along the respective optical paths thereof, and are synthesized through the dichroic mirrors
1413
and
1412
and the polarizing beam splitter
1200
. The synthesized light beam is then projected to a screen
1600
through the projection optical system
1500
. A liquid-crystal display panel
530
shown in a cross-sectional view in
FIG. 19
is used for each of the reflective liquid-crystal display light valves
1300
R,
1300
G, and
1300
B.
The liquid-crystal display panel
530
includes a reflective liquid-crystal display panel substrate
531
which is affixed using an adhesive agent to a support substrate
532
made of glass or ceramic, a glass substrate (opposing substrate)
535
on a light incident side of the panel
530
having thereon an opposing electrode (common electrode)
533
made of a transparent electrically conductive film (ITO), separated from the reflective liquid-crystal display panel substrate
531
by a sealing material
536
that extends on and along the outline of the reflective liquid-crystal display panel substrate
531
, and a known TN (Twisted Nematic) type liquid crystal
537
or an SH (Super Homeotropic) type liquid crystal
537
containing liquid-crystal molecules in a homeotropic alignment with no voltage applied, encapsulated in the space enclosed by the reflective liquid-crystal display panel substrate
531
, the glass substrate
535
, and the sealing material
536
.
FIG. 20
shows a major circuit arrangement of the reflective liquid-crystal display panel substrate
531
used in the liquid-crystal display panel
530
, and
FIG. 21
is an enlarged plan view showing the layout of the reflective liquid-crystal display panel substrate
531
. The reflective liquid-crystal display panel substrate
531
includes a rectangular pixel area (a display area)
520
in which a matrix of many pixel electrodes
514
shown in
FIG. 19
is arranged, scanning line drive circuits (Y drivers)
522
(
522
R and
522
L), arranged on the left- and right-hand sides of the pixel area
520
and composed of a shift register and a buffer circuit for scanning gate lines (scanning electrodes or row electrodes) Y
0
-Y
n
, a precharge and test circuit
523
arranged on and outside the top side of the pixel area
520
working for data lines (source lines, signal electrodes, or column electrodes) X
0
-X
m
an image signal sampling circuit
524
, arranged below the pixel area
520
, for sampling an image signal in accordance with image data to feed the image signal to the data line X
0
-X
m
, an outline seal area
527
where the above-referenced sealing material
537
is positioned outside the scanning line drive circuit
522
, the precharge and test circuit
523
, and the image signal sampling circuit
524
, a plurality of terminal pads
526
which are rigidly attached to a flexible tape wiring
539
through an anisotropic electrically conductive film (ACF)
538
, a shift register
521
arranged between a row of the terminal pads
526
and the seal area
527
for generating a selection pulse for the image signal sampling circuit
524
, and relay terminal pads (so-called silver-point pads)
529
R and
529
L arranged on both sides of the shift register
521
for feeding power to the opposing electrode
533
on the glass substrate
535
.
The shift register
521
and the image signal sampling circuit
524
form a signal line drive circuit (X driver)
540
for driving the data lines X
0-X
m
. The signal line drive circuit
540
employs a point-at-a-time scanning method in which the signal line drive circuit
540
successively feeds a data signal to the data lines X
0
-X
m
one by one. The signal line drive circuit
540
may employ a line-at-a-time scanning method in which a data signal is concurrently fed to all data lines X
0
-X
m
. The pixel area
520
, in which a matrix of pixels (pixel electrodes
514
) is arranged, has the data lines X
0
-X
m
. and the gate lines Y
0
-Y
n
, arranged in a grid, and pixel selecting MOSFETs (insulated-gate field-effect transistors) T (T
00
-T
nm
) respectively arranged in intersections of the data lines and the gate lines. The source S of the transistor T of each pixel is connected to the data line X, and the gate G thereof is connected to the gate line, and the drain D thereof is connected to the pixel electrode
514
and storage capacitor C, as will be discussed later. The pixel electrode
514
of the reflective liquid-crystal display panel substrate
531
is connected to a liquid-crystal cell LC of the liquid crystal
537
encapsulated between the reflective liquid-crystal display panel substrate
531
and the glass substrate
535
as the opposing substrate.
A light shielding film
525
(see
FIG. 19
) is arranged at the same level as the pixel electrode
514
, as a top layer, to prevent light from entering peripheral circuits (the scanning line drive circuits
522
R and
522
L, the precharge and test circuit
523
, and the image signal sampling circuit
524
) arranged inside the seal area
527
.
FIG. 22
is an enlarged plan view partly showing the pixel area
520
of the reflective liquid-crystal display panel substrate
531
, and
FIG. 23
is a cross-sectional view of the pixel area
520
taken along line A—A′ in FIG.
22
. Referring to
FIG. 23
, designated
501
is a monocrystal P semiconductor substrate (an N semiconductor substrate is optional), and having a size as large as 20 mm by 20 mm, for instance. A P-type well region
502
is formed on the surface (major surface) of an element forming region (for a MOSFET, for instance) of the semiconductor substrate
501
, and a field oxidation film (so-called LOCOS)
503
is formed to isolate elements in a non-element forming region of the semiconductor substrate
501
. Referring to
FIG. 23
, the P-type well region
502
is formed as a common well region for the pixel area
520
where a matrix of a number of pixels, for instance, as many as 768×1024, is arranged in a matrix configuration and is separated from the P-type well region into which the elements
Kovalick Vincent E.
Oliff & Berridg,e PLC
Seiko Epson Corporation
Shalwala Bipin
LandOfFree
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