Liquid crystal cells – elements and systems – Particular structure – Interconnection of plural cells in parallel
Reexamination Certificate
2001-02-28
2003-12-09
Parker, Kenneth (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Interconnection of plural cells in parallel
C349S110000
Reexamination Certificate
active
06661481
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a liquid crystal display, particularly to a liquid crystal display having one display screen by adjacently arranging a plurality of liquid crystal display panels on the same plane.
BACKGROUND OF THE INVENTION
High resolution displays, which in the past have progressed slowly in CRT displays, is about to rapidly progress in accordance with the introduction of new arts including liquid crystal. That is, it is comparatively easy to improve the resolution of a liquid crystal display compared to the case of a CRT display by micro-machining the liquid crystal display.
There has been additional study to further increase the screen size of the liquid crystal display. However, to increase the size a single liquid crystal display panel having a liquid crystal display, fraction defective is increased due to disconnection of signal wiring or pixel defect in the fabrication process.
Therefore, a large screen is achieved by adjacently arranging a plurality of liquid crystal display panels on the same plane and thereby, making a multi-type liquid crystal display as a whole. The panel constituted by adjacently arranging a plurality of liquid crystal display panels is referred to as a tile panel.
The problem with tile panels is that it is very difficult to have the joints of liquid crystal display panels in close contact with each other. This is due to fabrication errors of liquid crystal display panels, thereby, forming gaps. The light leaking from the gaps may deteriorate display performances. Therefore, to prevent the light from leaking, it is proposed to apply masking to the display plane side. It is possible to prevent parallel light vertical to a liquid crystal display panel out of the light emitted from a light source from leaking through masking. However, for the light incoming diagonally to a liquid crystal display panel, it is impossible to show the complete effect of the masking.
Therefore, it is proposed in Published Examined Japanese Patent Application No. 2-59999 to place an opaque material in a joint between liquid crystal display panels. More specifically, black paint is applied to the periphery of each liquid crystal display panel. Therefore, the light diagonally incoming to a liquid crystal display panel is interrupted by the black paint applied to the periphery of the liquid crystal display panel and therefore, it cannot enter the liquid crystal display panel.
Moreover, it is proposed in Published Examined Japanese Patent Application No. 2-60000 to apply an opaque material, specifically, black paint to a position corresponding to a joint between liquid crystal display panels on a common diffusion plate closely contacted to the surfaces of a plurality of liquid crystal display panels at the light source side.
However, the method for applying black paint to the periphery of a liquid crystal display panel disclosed in Published Examined Japanese Patent Application No. 2-59999 has the following problem. That is, the brightness of a liquid crystal display panel is reduced because not only diagonally incoming light but also the light to be incoming into a pixel are prevented from entering the liquid crystal display panel. The same is true for the liquid crystal display panel proposed in Published Examined Patent Application No. 2-60000.
Published Unexamined Japanese Patent Application No. 8-122769,
FIG. 11
of the present patent application, shows a schematic sectional view of the liquid crystal display. Though the liquid crystal display is the same as those disclosed in Published Examined Japanese Patent Application Nos. 2-59999 and 2-60000 in that an opaque member is formed on a joint between liquid crystal panels
60
. The opaque member
61
, made of silicone-based rubber, is set to the central portion of the end face of the liquid crystal panel
60
at the joint side. Thus, by setting the opaque member
61
to the central portion of the end face of the liquid crystal panel
60
at the joint side, the incoming light into a pixel out of diagonally incoming light can enter the liquid crystal panel
60
.
Published Unexamined Japanese Patent Application No. 8-122769 describes, as shown in FIG.
12
(A) of the present application, an opaque member
61
a
is formed at a predetermined width in the longitudinal direction of the connection-side end face of each liquid crystal display panel
62
to be joined and nearby the central portion of the end face. Then, as shown in FIG.
12
(B), the liquid crystal display panels
62
are connected so that the opaque members
61
a
are closely contacted to each other. Then, as shown in FIG.
12
(C), while the liquid crystal display panels
62
are connected to each other through the opaque members
61
a
, a large substrate
63
is attached to the liquid crystal display panels
62
through a refractive-index adjusting member
69
made of an UV cure resin.
To form the opaque member
61
a
at a predetermined width in the longitudinal direction of the connection-side end face of the liquid crystal display panel
62
and nearby the central portion of the end face, it is described in Published Unexamined Japanese Patent Application No. 8-122769 that it is possible to use a method for covering a predetermined position of the connection-side end face of the liquid crystal display panel
62
with a mask tape and applying silicone-based rubber, a method for applying silicone-based rubber by using a dispenser, or a method for applying silicone-based rubber by means of screen printing or offset printing.
A glass substrate forming the liquid crystal display panel
62
has dimensions of approx. 300×400 mm to 400×500 mm and has a thickness of approx. 0.7 mm. The liquid crystal display panel
62
is constructed by superposing two glass substrates through a liquid crystal layer, and the thickness of the two glass substrates is equal to approx. 1.4 mm.
However, it is not easy to accurately form the opaque member
61
a
over a length of 300 to 500 mm in the range of a thickness of 1.4 mm. Moreover, because silicone-based rubber has flowability when it is applied, it is difficult to obtain a desired shape of the opaque member
61
a
because the rubber flows immediately after it is applied. Therefore, even if the opaque member
61
a
is formed on the connection-side end faces of two liquid crystal display panels
62
, it is difficult to have the opaque members
61
a
in close contact with each other over a length of 300 to 400 mm when connecting two liquid crystal display panels
62
. That is, it is not easy to industrially make them in close contact with each other over the length.
Therefore, it is an object of the present invention to efficiently fabricate a tile panel capable of preventing light from leaking from a joint or a liquid crystal display using the tile panel.
SUMMARY OF THE INVENTION
A feature of the present invention provides a display panel complex comprising a plurality of image display panels arranged on the same plane and a joint for joining adjacent image display panels to each other among the plurality of image display panels. The joint is made of opaque particles having an opaqueness and an adhesive resin for dispersing and holding the opaque particles.
Another feature of the present invention provides a liquid crystal display including a liquid crystal display panel section having a plurality of liquid crystal display panels provided with a first glass substrate on which a black matrix is formed and a second glass substrate on which a liquid crystal driving device is formed on the same plane while keeping very small gaps between the panels. A filled part made of an UV cure resin fills very small gaps between the adjacent liquid crystal display panels among the above plurality of liquid crystal display panels and in which black particles are dispersed.
Still another feature of the present invention provides a liquid crystal display comprising a plurality of liquid crystal display panels arranged on the same plane while keeping predetermined gaps between them and a joint for join
International Business Machines - Corporation
Jennings Derek S.
Parker Kenneth
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