Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
1997-08-13
2001-05-22
Parker, Kenneth (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S153000
Reexamination Certificate
active
06236444
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Industrial Field of the Invention
The present invention relates to a liquid crystal display device comprising both a display region and a drive circuit region for a drive circuit which controls the display formed on a single substrate. The liquid crystal display device according to the present invention comprises another substrate opposed to the portion of the drive circuit in order to prevent failure from occurring on the drive circuit due to external pressure or shock.
2. Prior Art
Conventionally known liquid crystal display devices include active matrix-addressed (active matrix) liquid crystal display device comprising active elements such as a thin film transistor (referred to simply hereinafter as a “TFT”) on each of the pixels. Among them, there is also known an active matrix display device of a monolithic structure comprising drive circuits, which controls the signal applied to each of the pixels, provided integrated to the substrate having thereon the active elements connected to each of the pixels. The drive circuit is formed simultaneously with the fabrication of an amorphous silicon TFT for the display portion constituting the matrix, and then crystallized by selectively irradiating laser and the like to the drive circuit portion alone. In this manner, the TFTs in the drive circuit were converted into crystalline silicon TFTs.
Referring to
FIG. 1
which schematically shows a device of the type described above, it can be seen a substrate
2
opposing to a substrate
1
having thereon the drive circuit is extended to cover only a display region
5
comprising a liquid crystal material
3
, and no measure is taken for the drive circuit portion
6
except for covering with a resin
7
or a like material.
However, in the construction of a liquid crystal display device of a conventional type, an external force toward the drive circuit portion may easily cause damage on the drive circuit.
SUMMARY OF THE INVENTION
In the light of the aforementioned circumstances, the present invention provides a highly reliable liquid crystal electro-optical display device comprising both a display region and a drive circuit region on a single substrate, in which the drive circuit region is protected against external forces and the like.
According to one embodiment of the present invention, there is provided a liquid crystal electro-optical display device comprising a first substrate having thereon a display region and a drive circuit region comprising a drive circuit for controlling the display in said display region and a second substrate opposed to said first substrate, provided that said regions are partitioned by a sealing agent and that a liquid crystal material is incorporated between said first substrate and said second substrate opposed to the first one, wherein, said second substrate opposed to the first is extended to oppose both of said display region and said drive circuit region provided on the first substrate.
According to another embodiment of the present invention, there is provided a liquid crystal electro-optical display device comprising a first substrate having thereon a display region and a drive circuit region comprising a drive circuit for controlling the display in said display region and a second substrate opposed to said first substrate, provided that said regions are partitioned by a sealing agent and that a liquid crystal material is incorporated between said first substrate and said second substrate opposed to the first one, wherein, said second substrate opposed to the first is extended to oppose both of said display region and said drive circuit region provided on the first substrate, and at least a part of the periphery of said drive circuit region has thereon a sealing agent.
According to a still other embodiment of the present invention, there is provided a liquid crystal electro-optical display device comprising a first substrate having thereon a display region and a drive circuit region comprising a drive circuit for controlling the display in said display region and a second substrate opposed to said first substrate, provided that said regions are partitioned by a sealing agent and that a liquid crystal material is incorporated between said first substrate and said second substrate opposed to the first one, wherein, said second substrate opposed to the first is extended to oppose both of said display region and said drive circuit region provided on the first substrate, and a resin material is charged at least between said second substrate and said drive circuit region.
According to a yet other embodiment of the present invention, there is provided a liquid crystal electro-optical display device comprising a first substrate having thereon a display region and a drive circuit region comprising a drive circuit for controlling the display in said display region and a second substrate opposed to said first substrate, provided that said regions are partitioned by a sealing agent and that a liquid crystal material is incorporated between said first substrate and said second substrate opposed to the first one, wherein, said second substrate opposed to the first is extended to oppose both of said display region and said drive circuit region provided on the first substrate, at least a part of the periphery of said drive circuit region has thereon a sealing agent, and a resin material is charged at least between said second substrate and said drive circuit region.
According to further other embodiments of the present invention, there are provided liquid crystal display devices having the constitution enumerated above, wherein, a drive circuit is formed on the second substrate at a region opposed to the drive circuit region
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Konuma Toshimitsu
Moriya Kouji
Tsuji Takahiro
Nixon & Peabody LLP
Parker Kenneth
Robinson Eric J.
Semiconductor Energy Laboratory Co,. Ltd.
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