Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
1998-06-05
2002-06-11
Sikes, William L. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S046000, C349S051000, C349S147000, C349S148000
Reexamination Certificate
active
06404473
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device and, more particularly, to a liquid crystal display device which exhibits an improved production yield through elimination of disconnection in a wired laminated portion of an active matrix liquid crystal display device of the thin film transistor (TFT) type.
The liquid crystal display device has been widely utilized as a device for displaying a variety of images, including still images and moving images.
The liquid crystal display device is basically classified into two types, including the type (called the “simple matrix type”) wherein a liquid crystal layer is sandwiched between two substrates, at least one of which is made of transparent glass, and wherein a predetermined pixel is turned ON/OFF by applying a voltage selectively to various electrodes formed on the substrates for forming the pixels; and the type (called the “active matrix type” in which thin film transistors (TFT) are used as the switching elements) wherein the various electrodes and pixel selecting switching elements are formed so that a predetermined pixel is turned ON/OFF by selecting the switching elements.
The active matrix type liquid crystal display device has grown to be the main type used for display devices because of its contrast performance and quick display performance.
In the active matrix type liquid crystal display device, the longitudinal field type is generally employed, in which an electric field for changing the orientation of a liquid crystal layer is applied between electrodes formed on one substrate and electrodes formed on the other substrate. In recent years, however, a transverse field type (In-Plane Switching Mode: IPS type) liquid crystal display device has been introduced, in which the direction of the electric field to be applied to the liquid crystal is generally in parallel with the substrate face.
FIG. 10
is an exploded perspective diagram for explaining the overall structure of the active matrix type liquid crystal display device using an orientation film according to the present invention.
FIG. 10
illustrates the specific structure of the liquid crystal display device (or the module having a liquid crystal display panel, a circuit substrate, a back light and other components integrated to form a module called a “MDL”) according to the invention.
Reference letters SHD designate a shield case (also called the “metal frame”) made of metal sheet; letters WD designate a display window; letters INS
1
to INS
3
designate insulating sheets; letters PCB
1
to PCB
3
designate circuit substrates (of which PCB
1
is a drain side circuit substrate and a video signal line driving circuit substrate; PCB
2
is a gate side circuit substrate; and PCB
3
is an interface circuit substrate); letters JN
1
to JN
3
designate joiners for joining the circuit substrates PCB
1
to PCB
3
electrically; letters TCP
1
and TCP
2
designate tape carrier packages; letters PNL designate a liquid crystal display panel; letters GC designate a rubber cushion; letters ISL designate a shielding spacer; letters PRS designate a prism sheet; letters SPS designate a scattering sheet; letters GLB designate a light guide board; letters RFS designate a reflection sheet; letters MCA designate a lower case (or mold frame) formed by integral molding; letters MO designate an opening in the MCA; letters LP designate a fluorescent lamp; letters LPC designate a lamp cable; letters GB designate a rubber bushing for supporting the fluorescent lamp LP; letters BAT designate a pressure sensitive adhesive double coated tape; and letters BL designate a back light composed of the fluorescent lamp and the light guide board. The scattering sheet members are stacked in the illustrated arrangement to assemble the liquid crystal display module MDL.
The liquid crystal display module MDL includes two kinds of accommodating/holding members for the lower case MCA and the shield case SHD and is constructed by integrating the metallic shield case SHD accommodating and fixing the insulating sheets INS
1
to INS
3
, the circuit substrates PCB
1
to PCB
3
and the liquid crystal display panel PNL, and the lower case MCA accommodating the back light BL composed of the fluorescent lamp LP, the light guide board GLB and the prism sheet PRS.
On the video signal line driving circuit substrate PCB
1
, there is mounted an integrated circuit chip for driving the individual pixels of the liquid crystal display panel PNL. On the interface circuit substrate PCB
3
, on the other hand, there are mounted an integrated circuit chip for receiving video signals from an external host and control signals, such as timing signals, and a timing converter TCON for generating clock signals by processing the timings.
The clock signals, as generated by the timing converter, are fed through a clock signal line CLL, which is laid on the interface circuit substrate PCB
3
and the video signal line driving circuit substrate PCB
1
, to the integrated circuit chip which is mounted on the video signal line driving circuit substrate PCB
1
.
The interface circuit substrate PCB
3
and the video signal line driving circuit substrate PCB
1
are multi-layered wiring substrates, and the clock signal line CLL is formed as an inner wiring line of the interface circuit substrate PCB
3
and the video signal line driving circuit substrate PCB
1
.
Here, the liquid crystal display panel PNL is constructed by adhering two substrates, including the TFT substrate having TFTs and various wiring lines/electrodes, and the filter substrate having the color filter, and by sealing the liquid crystal in the clearance between the two substrates, such that the drain side circuit substrate PCB
1
for driving the TFTs, the gate side circuit substrate PCB
2
and the interface circuit substrate PCB
3
are connected by the tape carrier packages TCP
1
and TCP
2
, and such that the individual circuit substrates are connected by the joiners JN
1
, JN
2
and JN
3
.
FIG. 11
is a schematic diagram for explaining the wired structure in the vicinity of one pixel of the TFT substrate forming the liquid crystal display device shown in FIG.
10
. Reference numeral
1
designates a substrate; numeral
2
designates a scanning signal line (or gate line); numeral
2
′ designates an adjacent scanning signal line (or adjoining gate line); numeral
3
designates a video signal line (or drain line); numeral
4
designates a source electrode; numeral
6
designates a pixel electrode; letters TFT designate a thin film transistor; and letters Cadd designate a capacity added element.
In
FIG. 11
, the central portion of the substrate
1
, except for the periphery, provides a display region which is filled with a liquid crystal material in the clearance which is formed by joining the other substrate or the filter substrate to it.
In this display region, moreover, there are formed the scanning signal line
2
(or gate line), extending in an X-direction, and the video signal line
3
(or drain line), extending in a Y-direction. There is further formed a source electrode, which extends in the Y-direction while being insulated from the scanning signal line
2
, which also extends in the X-direction.
Each region, as defined by the scanning signal line
2
and video signal line
3
, forms one pixel.
In other words, the aforementioned display region is formed of a set of numerous pixel regions arranged in a matrix shape.
Each pixel region is composed of the thin film transistor TFT to be turned On when a scanning signal is fed from the scanning signal line
2
and the video signal line
3
, so that the pixel electrode
5
is fed by the video signal from the video signal line
3
passing through the thin film transistor TFT, which is turned ON. In addition to the thin film transistor TFT and pixel electrode
5
, the capacity added element Cadd is formed between the adjoining scanning signal line
2
′, other than the scanning signal line
2
for driving the thin film transistor TFT, and the aforementioned pixel electrode
5
.
Th
Cyahara Kenichi
Hashimoto Yuichi
Kaneko Toshiki
Ochiai Takahiro
Ohhara Kazuhiro
Antonelli Terry Stout & Kraus LLP
Chowdhury Tarifur R.
Hitachi , Ltd.
Sikes William L.
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