Active matrix panel

Active solid-state devices (e.g. – transistors – solid-state diode – Non-single crystal – or recrystallized – semiconductor... – Field effect device in non-single crystal – or...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C257S758000, C257S775000

Reexamination Certificate

active

06700135

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates generally to an active matrix panel and more particularly to a high density active matrix panel formed with thin film transistors, for driving a liquid crystal display (LCD).
2. Description of Related Art
A conventional active matrix liquid crystal display panel including a matrix of liquid crystal picture elements formed with thin film transistors (TFT's) on a transparent substrate is described in Morozumi et al., “Black and White and Color Liquid Crystal Video Displays Addressed by Polysilicon TFTs”, SID-83 Digest, pp. 156-57 and is shown in
FIG. 19. A
monocrystalline silicon MOS integrated gate line driver circuit
4
′ for driving a plurality of gate lines
4
a
′ and a source line driver circuit
4
for driving a plurality of orthogonal source lines
4
a
are formed on a flexible substrate
3
. An active matrix panel
1
includes a matrix of liquid crystal picture elements at the cross-over of respective gate lines
4
a
′ and source lines
4
a
and a plurality of electrical connection pads
5
. Driving circuits
4
and
4
′ are electrically coupled to panel
1
at pads
5
. Both flexible substrate
3
and panel
1
are mounted on a substrate
6
and integrated driver circuits
4
and
4
′ are electrically coupled to other circuitry (not shown).
Such conventional active matrix panels can provide viewable displays, but they can have the following disadvantages.
1. Inadequate Resolution.
Flexible substrate
3
and source lines
4
a
and gate lines
4
a
′ of active matrix panel
1
are electrically coupled at pads
5
. Accordingly, the picture elements cannot be sufficiently densely spaced because of the space occupied by pads
5
. This interferes with mass production of active matrix panels having a picture element pitch of 100 &mgr;m or less and prevents high resolution.
2. Inadequate Display Device Miniaturization.
Driver integrated circuits
4
and
4
′ are located outside of panel
1
on substrate
6
. Accordingly, active matrix panel
1
occupies only about ¼ or ⅕ of the surface area of substrate
6
. Consequently, display devices including conventionally formed active matrix panels are undesirably larger than the picture element matrix portion of the entire panel. This makes it inconvenient to include conventional active matrix panels when miniaturization is needed, such as for a micro-monitor which can be used as an electric view finder for a video camera.
3. High Manufacturing Costs.
Manufacturing a conventional display including an active matrix panel requires many connections as follows. Active matrix panel
1
is connected to flexible substrate
3
; driver integrated circuit
4
is connected to flexible substrate
3
; and flexible substrate
3
is mounted on mounting substrate
6
. These multiple connection steps increase manufacturing costs.
4. Low Reliability.
Because conventional active matrix panels require so many connections, when stress is applied to the panel, these connections can come apart. This affects the reliability of the entire display and increases costs because extra measures must be undertaken to compensate for the possibility of disconnections.
Accordingly, it is undesirable to develop an improved active matrix panel which does not have the shortcomings of conventional active matrix panels.
SUMMARY OF THE INVENTION
Generally speaking, in accordance with the invention, an active matrix device includes a substrate with a matrix of thin film transistor switching elements formed thereon. A gate line driver circuit and/or a source line driver circuit includes thin film transistors in a complementary metal oxide semiconductor (CMOS) configuration formed on the substrate having the same cross-sectional structure as the switching elements. The driver circuit thin film transistors are either of the P-type or N-type. The thin film transistors in a CMOS configuration are also referred to herein as complementary thin film transistors.
In one embodiment, the gate line driver circuit and/or the source line driver circuit on the panel substrate includes a static shift register formed of complementary thin film transistors. In another embodiment, the gate line driver circuit and/or the source line driver circuit include P-type and N-type thin film transistor in which the P-type thin film transistor includes acceptor impurities in the source region and drain region and the N-type thin film transistor includes donor impurities having a higher concentration than the acceptor impurities in the source and drain regions. Alternatively, the P-type thin film transistor includes donor impurities and acceptor impurities with a higher concentration of acceptor impurities than the donor impurities in the source region and drain region. The gate length of the P-type and N-type thin film transistors forming the gate line and source line driver circuits is shorter than the gate length of the thin film transistors of the active element matrix.
Accordingly, it is an object of the invention to provide an improved active matrix panel.
Another object of the invention is to provide an active matrix panel that is low in price and high in resolution and reliability.
A further object of the invention is to provide an active matrix panel which has low active element pitch.
Still another object of the invention is to provide an improved active matrix liquid crystal display panel having a high density of picture elements.
Still a further object of the invention is to provide an improved miniaturized active panel.
Yet another object of the invention is to provide an improved active matrix panel that can be used as an electric view finder for a video camera, a monitor for a portable VCR like.
Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification and drawings.
The invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others, and the article possessing the features, properties and the relation of elements, which are exemplified in the following detailed disclosure, and the scope of the invention will be indicated in the claims.


REFERENCES:
patent: 3964941 (1976-06-01), Wang
patent: 3967253 (1976-06-01), Tsuruishi
patent: 4199773 (1980-04-01), Goodman et al.
patent: 4271422 (1981-06-01), Ipri
patent: 4346378 (1982-08-01), Shanks
patent: 4399605 (1983-08-01), Dash et al.
patent: 4429305 (1984-01-01), Hosokawa et al.
patent: 4507846 (1985-04-01), Ohno
patent: 4573766 (1986-03-01), Bournay, Jr. et al.
patent: 4586039 (1986-04-01), Nonomura et al.
patent: 4677735 (1987-07-01), Malhi
patent: 4724433 (1988-02-01), Inoue et al.
patent: 4740782 (1988-04-01), Aoki et al.
patent: 4799057 (1989-01-01), Takeda et al.
patent: 4818981 (1989-04-01), Oki et al.
patent: 4823126 (1989-04-01), Nagata et al.
patent: 4838654 (1989-06-01), Hamaguchi et al.
patent: 4857907 (1989-08-01), Koden
patent: 4864390 (1989-09-01), McKechnie et al.
patent: 4870300 (1989-09-01), Nakaya
patent: 4877483 (1989-10-01), Bergemont et al.
patent: 4881066 (1989-11-01), Kanno et al.
patent: 4883986 (1989-11-01), Egawa et al.
patent: 4922240 (1990-05-01), Duwaer
patent: 4931787 (1990-06-01), Shannon
patent: 4935637 (1990-06-01), Kaifu et al.
patent: 4936656 (1990-06-01), Yamashita et al.
patent: 4947229 (1990-08-01), Tanaka
patent: 4994877 (1991-02-01), Ino
patent: 5013939 (1991-05-01), Satoh
patent: 5021774 (1991-06-01), Ohwada et al.
patent: 5073723 (1991-12-01), DaCosta
patent: 5095348 (1992-03-01), Houston
patent: 0 179 914 (1986-05-01), None
patent: 239 958 (1987-10-01), None
patent: 259 875 (1988-03-01), None
patent: 239 958 (1987-08-01), None
patent: 2070857 (1981-09-01), None
patent: 2 070 857 (1981-09-01), None
patent: 2 117 970 (1983-10-01), None
patent: 2 126 779 (1984-03-01), None
patent: 56-4183 (1981-01-01), None
patent: 56-38033 (1981-04-01), None
patent: 58-4180 (1983-01-01), None
patent: 58-184122 (1983-10-01), None
patent: 60154660 (1985-08-0

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Active matrix panel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active matrix panel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active matrix panel will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3221136

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.