JP2737986B2 - Liquid crystal device - Google Patents

Description

The present invention relates to a method of forming a peripheral circuit for driving a panel of a liquid crystal display panel in which a liquid crystal layer is sandwiched between two upper and lower substrates.

[Prior Art] A conventional liquid crystal display panel has a structure as shown in FIG.
FIG. 2 is a partial sectional view of a conventional liquid crystal display panel. In FIG. 2, reference numerals 21 and 22 denote glass substrates, reference numeral 23 denotes an electrode terminal, reference numeral 24 denotes an anisotropic conductive film, reference numeral 25 denotes a liquid crystal driving IC, reference numeral 26 denotes a driver tape on which a liquid crystal driving TC is mounted, and reference numeral 27 denotes a bus line and the like. 3 shows a rigid circuit board obtained. The liquid crystal layer 28 is
The liquid crystal layer is sandwiched between the glass substrates 21 and 22 at the sealing portion 29 to form a liquid crystal panel. Electrode terminals 23 were formed. On the other hand, the driver tape 26 on which the liquid crystal driving IC is mounted by gang bonding is conductively connected at its output end to the above-mentioned electrode terminal 23 by an anisotropic conductive film 24. Further, the input end 31 of the driver tape is joined by soldering to a rigid circuit board on which bus lines and the like are formed.

[Problems to be Solved by the Invention] However, the conventional liquid crystal display panel has a number of problems as apparent from FIG.

First, conventional liquid crystal display panels require a large number of components to drive the liquid crystal, such as a rigid circuit board on which a bus line is formed in addition to the liquid crystal panel, and multiple driver tapes. However, the manufacturing cost is high as the number of connection points increases.

Furthermore, the conventional liquid crystal display panel requires a large number of components required to drive the liquid crystal, so the connection location is between the electrode terminals of the panel made of anisotropic conductive film and the driver tape, and the liquid crystal drive IC and Between the driver tape and between the rigid board and the driver tape by soldering, the number of connections increased, and the overall connection reliability was reduced accordingly.

Further, in the conventional liquid crystal display panel, large parts such as a driver tape and a rigid substrate are attached to the outside of the liquid crystal panel, and the frame size of the liquid crystal panel with respect to the active screen is increased, thereby reducing the commercial value.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the conventional drawbacks and to reduce the number of components of the liquid crystal display panel to reduce the cost and at the same time to improve the reliability and reduce the frame size.

[Means for Solving the Problems] According to the present invention, in a liquid crystal device in which a liquid crystal is held between a pair of substrates and a liquid crystal driving IC is mounted on the substrate, a signal is supplied to the liquid crystal driving IC. A first electrode terminal electrically connected to a first conductive wiring pattern for supplying a liquid crystal, and a second electrode terminal electrically connected to a second conductive wiring pattern for supplying a signal to the liquid crystal An insulating film is formed on a part of the first electrode terminal and the second electrode terminal, and the first film is formed on the insulating film.
And a fourth conductive wiring pattern electrically connected to the second electrode terminal is formed, and a third conductive wiring pattern electrically connected to the second electrode terminal is formed. A plurality of electrode terminals are connected to the third conductive wiring pattern or the fourth conductive wiring pattern, respectively.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part in an embodiment of the present invention.
In FIG. 1, reference numerals 1 and 2 denote glass substrates, 3 denotes a wiring pattern in a panel, 4 denotes a sealing portion, 5 denotes a liquid crystal layer, 6 denotes a color filter layer, 7 denotes a first conductive wiring pattern, and 8 denotes an organic thin film layer. , 9 is a conductive wiring pattern of the second layer, 10 is a hole of the organic thin film layer, and 11 is a step of the organic thin film layer. The liquid crystal layer 5 is sandwiched between the glass substrates 1 and 2 and confined by the seal portion 4 to form a liquid crystal panel. The organic thin film layer 8 is of the same quality that can be formed simultaneously with the color filter layer 6. The first layer conductive wiring pattern is made of IT, Ni, Cr, Ta, etc.
It is formed by etching after being formed by D or the like.
Thereafter, an organic thin film layer is formed on the wiring pattern,
This becomes an insulating layer. This organic thin film layer can be used as appropriate for holes,
Steps and the like are formed. Further, another conductive wiring pattern is formed on the organic thin film layer, and the conductive wiring pattern on the organic thin film is formed by the conductive wiring pattern of the first layer and the notch, hole, step, etc. of the organic thin film layer. Conducted up and down.

As is clear from FIG. 1, the liquid crystal display panel according to the present invention has a very small number of components necessary for driving the liquid crystal, since the circuit pattern for forming the bus lines is formed on the liquid crystal display panel. Since the connection can be reduced and the connection between the liquid crystal panel and the rigid substrate is not required, the manufacturing cost is also reduced.

Further, in the liquid crystal display panel according to the present invention, the number of components necessary for driving the liquid crystal can be extremely reduced because the circuit pattern forming the bus line is formed on the liquid crystal display panel, and the number of connected parts is accordingly reduced. Since the number of points can be reduced, the reliability of the total connection can be improved.

Furthermore, in the liquid crystal display panel according to the present invention, the number of components necessary for driving the liquid crystal is such that the circuit pattern forming the bus line is formed on the liquid crystal display panel.
A large component does not come to the outside of the liquid crystal panel, and the frame size of the liquid crystal panel with respect to the active screen can be reduced.

As described above, the number of layers of the conductive wiring pattern is not limited to two, but may be three or more.

FIG. 3 is a sectional view of a main part of another embodiment according to the present invention in which a liquid crystal driving IC is mounted face down on a glass substrate. The electrode bumps 13 of the liquid crystal driving IC 12 are connected to the electrode terminals connected to the wiring pattern in the panel and the electrode terminals connected to the input signal terminals, and can provide a common signal to a plurality of liquid crystal driving ICs or a continuous signal. In some cases, the bus line is provided to intersect with an electrode terminal connected to the electrode bump 13 of the liquid crystal driving IC via an insulating layer, and is wired so as to intersect. It has a three-dimensional configuration.

[Effects of the Invention] As described above, the present invention reduces costs by forming a circuit pattern for forming a bus line or the like for driving a liquid crystal panel on a substrate with a plurality of conductive wiring patterns via a thin film. This has the effect of reducing the size, improving the reliability, and reducing the frame size.

[Brief description of the drawings]

 FIG. 1 is a sectional view of a main part in an embodiment of the present invention. FIG. 2 is a sectional view of a main part in a conventional embodiment. FIG. 3 is a sectional view of a main part according to another embodiment of the present invention. 1,2,21,22 ... Glass substrate 3,30 ... In-panel wiring pattern 4,29 ... Seal part 5,28 ... Liquid crystal layer 6,32 ... Color filter layer 7 ... First layer conductivity Wiring pattern 8 Organic thin-film layer 9 Second-layer conductive wiring pattern 10 Holes in the organic thin-film layer 11 Steps in the organic thin-film layer 23 Electrode terminals 24 Anisotropic conductive film 12 , 25… LCD drive IC 13… LCD drive IC electrode bumps 14… Second organic thin film layer 26… Driver tape 27… Rigid circuit board

Claims (1)

(57) [Claims] 1. A liquid crystal device in which liquid crystal is sandwiched between a pair of substrates and a liquid crystal driving IC is mounted on the substrates, wherein a first conductive wiring for supplying a signal to the liquid crystal driving IC is provided. A first electrode terminal electrically connected to a pattern, and a second electrode terminal electrically connected to a second conductive wiring pattern for supplying a signal to the liquid crystal; An insulating film is formed on the electrode terminal and a part of the second electrode terminal, and a third conductive wiring electrically connected to the first electrode terminal on the insulating film. A pattern and a fourth conductive wiring pattern electrically connected to the second electrode terminal are formed, and the plurality of electrode terminals of the liquid crystal driving IC are respectively connected to the third conductive wiring pattern or the third conductive wiring pattern. It is characterized by being connected to the fourth conductive wiring pattern. A liquid crystal device to be.