Stacked display device with folded substrate

Details Stacked display device with folded substrate Stacked display device with folded substrate

2000-11-20

2002-12-31

Ton, Toan (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S074000, C345S004000, C345S005000

Reexamination Certificate

active

06501528

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 11-336422, filed Nov. 26, 1999, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a stacked display device and, more particularly, to a stacked display device constructed by one intermediate substrate and one outer substrate which sandwiches the intermediate substrate.
As electrooptic display devices using, e.g., a liquid crystal panel, a composite-type device having a touch input panel stacked on the front surface of a display panel on the observation side and a two-layered device having two, front and rear display panels are stacked are conventionally known. These devices are called stacked display devices.
FIG. 1
is a sectional view of a conventional stacked display device in which hatching is omitted.
FIG. 1
shows a composite-type display device having a touch input panel (to be referred to as a touch panel hereinafter)
2
stacked on the front surface of a liquid crystal display panel
1
.
In this stacked display device, one intermediate substrate
10
is shared as substrates on the adjacent sides of the liquid crystal display panel
1
and touch panel
2
. This device comprises the intermediate substrate
10
, a display panel substrate
11
opposing the rear surface of the intermediate substrate
10
, and a touch panel substrate
12
opposing the front surface of the intermediate substrate
10
.
The intermediate substrate
10
and display panel substrate
11
are transparent substrates made of glass. Transparent display panel electrodes
13
and
14
opposing each other are formed on the rear surface of the intermediate substrate
10
and on the inner surface (surface opposing the intermediate substrate
10
) of the display panel substrate
11
, respectively. Alignment films
15
and
16
cover the electrodes
13
and
14
, respectively.
One of the intermediate substrate
10
and display panel substrate
11
, and for example, the display panel substrate
11
has, on one end side, an edge portion projecting from the intermediate substrate
10
as the other substrate. The edge portion has, on its inner surface, a plurality of display panel terminal electrodes
17
corresponding to the display panel electrodes
13
and
14
formed on the rear surface of the intermediate substrate
10
and on the inner surface of the display panel substrate
11
, respectively.
Although not illustrated in
FIG. 1
, the inner surface of the display panel substrate
11
has lead wires which connect the display panel electrodes
14
formed on the inner surface of the display panel substrate
11
to predetermined terminal electrodes of the plurality of display panel terminal electrodes
17
formed at the edge portion, pad electrodes corresponding to the terminal connections of the display panel electrodes
13
formed on the rear surface of the intermediate substrate
10
, and lead wires which connect the pad electrodes to the remaining predetermined terminal electrodes of the plurality of display panel terminal electrodes
17
.
The intermediate substrate
10
and display panel substrate
11
are jointed by a first frame-shaped sealing member
18
inserted therebetween while maintaining a predetermined gap. The terminal connections of the display panel electrodes
13
formed on the rear surface of the intermediate substrate
10
and the above-described pad electrodes on the inner surface of the display panel substrate
11
are electrically connected through conductive members (not shown) in or near the substrate joint region by the sealing member
18
. A liquid crystal is encapsulated in the region in the gap, surrounded by the sealing member
18
between the intermediate substrate
10
and the display panel substrate
11
to form a liquid crystal layer
19
. The liquid crystal display panel
1
has the above-described structure.
The touch panel substrate
12
opposing the front surface of the intermediate substrate
10
is formed from a transparent resin film having flexibility. Transparent touch panel electrodes
20
and
21
are formed on the front surface of the intermediate substrate
10
and the inner surface (surface opposing the intermediate substrate
10
) of the touch panel substrate
12
made of a resin film, respectively, so as to extend in directions perpendicular to each other.
One of the intermediate substrate
10
and touch panel film substrate
12
, and for example, the intermediate substrate
10
has, on one end side, an edge portion projecting from the film substrate
12
as the other substrate. The edge portion has, on its front surface, a plurality of touch panel terminal electrodes
22
corresponding to the touch panel electrodes
20
and
21
formed on the front surface of the intermediate substrate
10
and the inner surface of the film substrate
12
, respectively.
Although not illustrated in
FIG. 1
, the front surface of the intermediate substrate
10
has lead wires which connect the touch panel electrodes
20
formed on the front surface of the intermediate substrate
10
to predetermined terminal electrodes of the plurality of touch panel terminal electrodes
22
formed at the edge portion, pad electrodes corresponding to the terminal connections of the touch panel electrodes
21
formed on the inner surface of the film substrate
12
, and lead wires which connect the pad electrodes to the remaining predetermined terminal electrodes of the plurality of touch panel terminal electrodes
22
.
The touch panel
2
is constituted by jointing the intermediate substrate
10
and the touch panel film substrate
12
with a second frame-shaped sealing member
23
inserted therebetween and electrically connecting the terminal connections of the touch panel electrodes
21
formed on the inner surface of the touch panel substrate
12
to the pad electrodes on the front surface of the intermediate substrate
10
through conductive members (not shown) in or near the substrate joint region by the frame-shaped sealing member
23
.
This stacked display device is a TN (Twisted Nematic) type liquid crystal display device, for which the initial aligned state of the liquid crystal molecules in the liquid crystal layer
19
of the liquid crystal display panel
1
is twisted alignment with a predetermined twist angle (e.g., almost 90°), and polarizing plates
24
and
25
are arranged on the rear surface of the liquid crystal display panel
1
(outer surface of the display panel substrate
11
) and the front surface of the touch panel
2
(outer surface of the touch panel film substrate
12
) while extending their transmission axes in predetermined directions.
The stacked display device shown in
FIG. 1
has a composite combination with the touch panel
2
stacked on the front surface of the liquid crystal display panel
1
. However, some stacked display devices have two display panels stacked on the front and rear sides. For example, in a two-stacked display device having two liquid crystal display panels stacked, conventionally, the touch panel
2
of the stacked display device shown in
FIG. 1
is replaced with a second liquid crystal display panel.
However, as shown in
FIG. 1
, the conventional stacked display device has the intermediate substrate
10
shared as substrates on the adjacent sides of the first panel (liquid crystal display panel in
FIG. 1
)
1
and second panel (touch panel in
FIG. 1
)
2
, the first panel substrate
11
opposing the rear surface of the intermediate substrate
10
, and the second panel substrate
12
opposing the front surface of the intermediate substrate
10
, in which the first panel electrodes
13
and
14
are formed on one surface of the intermediate substrate
10
and the inner surface of the first panel substrate
11
, and the second panel electrodes
20
and
21
are formed on the other surface of the intermediate substrate
10
and the inner surface of the second panel substrate
12
. For this reason, three substra

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