JP2857350B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display.

[0002]

2. Description of the Related Art A display device using liquid crystal has features, such as low power and light weight, which are not present in a conventional display, and its product power has been enhanced by the advancement of peripheral technology, and it has been used in various products. Among them, a thin film transistor (Thin-FilmTransistor:
In the following, an active matrix type liquid crystal display device using a "TFT") can obtain a clear image display without crosstalk.
It is used in laptop PC displays and car navigation displays, and is rapidly expanding its market.

As a conventional liquid crystal display device, FIG.
1 shows an example of a configuration of an active matrix type liquid crystal panel using the same. In this liquid crystal panel, a common electrode 2 is provided on an upper glass substrate 1, and a plurality of signal lines 4 and scanning lines 20 which are orthogonal to each other, and a region defined by the signal lines 4 and the scanning lines 20 are formed on a lower glass substrate 3. , A TFT 6 serving as a switching element disposed at each intersection of the signal line 4 and the scanning line 20, a signal line connection terminal 5 provided at an end of the signal line 4, and a signal line connection terminal. A disconnection rescue terminal 9 adjacent to 5, a wiring 9 a connected to the disconnection rescue terminal 9 and arranged orthogonal to the signal line 4, and a common electrode extraction terminal 8 adjacent to the disconnection rescue terminal 9 are provided.
The signal line connection terminal 5, the disconnection rescue terminal 9 and the common electrode take-out terminal 8 are arranged at regular intervals. The disconnection rescue terminal 9 and the wiring 9a connected thereto are for relieving a disconnection failure of the signal line 4.

FIG. 3 is a sectional view of a conventional liquid crystal panel.
The above-mentioned upper and lower glass substrates 1 and 3 are bonded together with an adhesive 10 including a spacer formed of a plastic ball or the like, and a liquid crystal 11 is sealed between them. The common electrode 2 formed on the upper glass substrate 1 is connected to a common electrode extraction terminal 8 formed on the lower glass substrate 3 by a conductive adhesive 12. Although not shown in FIG. 2,
Polarizing plates 13 are attached to the outside of the glass substrates 1 and 3, respectively.

In order to supply a signal to a liquid crystal panel, as shown in FIG. 4, a TFT driving integrated circuit (hereinafter referred to as "driving I
C) 14) is referred to as TAB (Tape Automa).
The substrate is mounted on a flexible substrate 15 having wiring and terminals formed of copper foil on a polyimide tape by a ted bonding method, and is positioned and connected to the signal line connection terminals 5 (FIG. 2) on the liquid crystal panel. The signal supply to the flexible board 15 is performed by connecting the bus wiring board 16.

As shown in FIG. 5, an input signal line 17 connected to the driving IC 14 is
Further, an output signal line 18 and a wiring 19 which is directly connected to the liquid crystal panel without being connected to the driving IC 14 from the bus wiring board 16 are formed. The output signal line 18 is connected to the signal line connection terminal 5 shown in FIG. 2, and the wiring 19 not via the driving IC 14 is connected to the common electrode extraction terminal 8 and the disconnection rescue terminal 9 shown in FIG. Therefore, the output signal line 18 and the wiring 19 directly connected to the liquid crystal panel without being connected to the driving IC 14 are adjacent to each other in the terminal arrangement on the liquid crystal panel when connected to the liquid crystal panel.

[0007]

Since the liquid crystal panel has a structure in which the liquid crystal 11, which is an insulator, is interposed between the common electrode 2 and the pixel electrode 7, the entire liquid crystal panel is a large capacitor. Therefore, when static electricity is generated in the liquid crystal panel due to friction with the transport system during manufacturing of the liquid crystal panel and friction during handling, the charge is charged in the liquid crystal panel. In particular, when attaching the polarizing plate 13 to the liquid crystal panel, the liquid crystal panel may be charged by about 2 kV when the amount is large. Thereafter, when the flexible substrate 15 is connected to the liquid crystal panel and the flexible substrate 15 touches a manufacturing apparatus or the like, and the disconnection rescue terminal 9 connected to the wiring 19 not via the driving IC 14 is grounded, the adjacent Discharge occurs between the common electrode extraction terminal 8 and the disconnection rescue terminal 9 and between the signal line connection terminal 5 and the disconnection rescue terminal 9. Here, when a discharge phenomenon occurs between the signal line connection terminal 5 and the disconnection rescue terminal 9, the driving IC 14 and the T connected to the driving IC 14 are connected.
There is a problem that FT6 is destroyed. In addition, the increase in capacity due to the enlargement of the screen of the liquid crystal panel and the narrowing of the electrode terminal pitch due to the increase in definition have further accelerated the discharge phenomenon.

In order to overcome the above-mentioned drawbacks, the polarizing plate 1
Attempts have been made to remove electricity with a static eliminator or the like when attaching No. 3, or to lower the work speed and reduce friction to reduce the charge itself, but this has problems such as affecting the cost and productivity. The present invention solves the above problems,
It is an object of the present invention to provide a liquid crystal display device capable of preventing destruction of an integrated circuit, a switching element, or the like due to a discharge phenomenon of charges charged inside during manufacturing without adversely affecting cost and productivity.

[0009]

According to the liquid crystal display device of the present invention, a pixel electrode is provided in an area defined by a plurality of scanning lines and a plurality of signal lines orthogonal to the plurality of scanning lines, and a plurality of scanning lines and a plurality of signal lines are provided. A switching element of a pixel electrode is provided at each intersection with a line, a signal line connection terminal is provided at each end of the plurality of signal lines, and a disconnection failure of the signal line is rescued outside the plurality of signal line connection terminals. A first substrate provided with a disconnection rescue terminal, a second substrate provided with a counter electrode opposed to the pixel electrode with the liquid crystal interposed therebetween, an integrated circuit mounted, input wiring of the integrated circuit provided, and a plurality of signals provided; An integrated circuit mounting substrate provided with an integrated circuit output wiring connected to the line connection terminal and provided with a disconnection rescue line connected to the disconnection rescue terminal without passing through the integrated circuit; an input circuit of the integrated circuit and a disconnection rescue line And electrical connection A liquid crystal display device comprising: a first substrate having at least one electrically floating dummy terminal between a plurality of signal line connection terminals and a disconnection rescue terminal; It is characterized by.

[0010]

According to the structure of the present invention, a plurality of signal line connection terminals and disconnection rescue terminals are provided on a first substrate having pixel electrodes, switching elements, scanning lines, signal lines, signal line connection terminals, and disconnection rescue terminals. Between the signal line connection terminal and the disconnection rescue terminal becomes longer, and the disconnection rescue terminal not connected to the integrated circuit becomes longer. Even if it is grounded, it is possible to prevent the discharge phenomenon of the charges charged in the liquid crystal panel between the signal line connection terminal connected to the integrated circuit and the disconnection rescue terminal, and to prevent the destruction of the integrated circuit and the switching element. Can be.

[0011]

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an assembly configuration diagram of a liquid crystal display device according to one embodiment of the present invention. In FIG. 1, 1 is an upper glass substrate (second substrate), 2 is a common electrode (counter electrode), 21 is a lower glass substrate (first substrate), 22 is a signal line, 23 is a signal line connection terminal, 24 is a TFT, 25 is a pixel electrode, 26 is a common electrode extraction terminal, 27 is a disconnection rescue terminal, 27a is a wiring connected to the disconnection rescue terminal 27 and arranged orthogonal to the signal line 22, and 28 is a flexible substrate (integrated circuit mounting substrate). ), 29 is a driving IC (integrated circuit), 30 is an output signal line, 31 is an input signal line, 32 is a common electrode line, 33 is a disconnection rescue line, 34 is a bus wiring board (wiring board), and 35 is a dummy wiring , 36 are dummy terminals, and 37 is a scanning line.

This liquid crystal panel has the same structure as that of the conventional example in which the common electrode 2 is provided on the upper glass substrate 1, but a plurality of signal lines 22 and scanning lines 37 orthogonal to each other are provided on the lower glass substrate 21. A pixel electrode 25 provided in a region defined by the signal line 22 and the scanning line 37;
TF which is a switching element arranged at each intersection with
T24 and a signal line connection terminal 2 provided at an end of the signal line 22
3, a disconnection rescue terminal 27, a wiring 27a connected thereto, and a common electrode extraction terminal 26, and a dummy terminal 36 is provided between the signal line connection terminal 23 and the disconnection rescue terminal 27. Signal line connection terminal 2
3. The dummy terminal 36, the disconnection rescue terminal 27, and the common electrode take-out terminal 26 are arranged at regular intervals.

A flexible substrate 28 on which a driving IC 29 is mounted has an output signal line 3 connected to the driving IC 29.
0, an input signal line 31, a common electrode line 32 and a disconnection rescue line 33 not connected to the drive IC 29, and a drive IC 29 and a bus wiring board between the output signal line 30 and the disconnection rescue line 33. A dummy wiring 35 that is not connected to either of them is provided. And
The output signal line 30 is connected to the signal line connection terminal 23, the common electrode line 32 is connected to the common electrode extraction terminal 26, the disconnection rescue line 33 is connected to the disconnection rescue terminal 27, and the dummy wiring 35 is connected to the dummy terminal 36. The flexible substrate 28 is connected to the liquid crystal panel so as to be connected to the liquid crystal panel. Signal supply to the flexible board 28 is performed by connecting the bus wiring board 34.

The liquid crystal panel and the flexible substrate 28
Is connected, the driving IC 29 and the TFT 2 of the liquid crystal panel are connected.
The dummy terminal 36 provided between the signal line connection terminal 23 connected to the terminal 4 and the disconnection rescue terminal 27 is a so-called floating terminal to which no voltage is applied. As described above, according to this embodiment, even if the flexible substrate 28 is connected to the charged liquid crystal panel and the disconnection rescue line 33 and the disconnection rescue terminal 27 are grounded, the connection between the disconnection rescue terminal 27 and the signal line is made. Since the dummy terminal 36 is provided between the signal line connection terminal 23 and the disconnection rescue terminal 2, the distance between the terminals is long.
7 does not occur, and a discharge phenomenon occurs between the common electrode lead-out terminal 26 and the disconnection rescue terminal 27 having a short distance between the terminals. Thereby, the driving I
A liquid crystal panel can be manufactured without damaging C29 or TFT 24. Also, the dummy terminal 36
Is provided, there is no adverse effect on cost and productivity.

In the above embodiment, one dummy terminal 36 is provided. However, a plurality of dummy terminals 36 may be provided, or the distance between the dummy terminal 36 and the disconnection rescue terminal 27 may be reduced by the dummy terminal 36 and a signal adjacent thereto. Needless to say, by setting the distance larger than the distance from the line connection terminal 23, the effect is further increased. The lower glass substrate 21
The dummy wirings 35 are provided not only on the flexible substrate 28 but also on the flexible substrate 28. This is because when connecting the flexible substrate 28 to the lower glass substrate 21, the terminals of the lower glass substrate 21 Substrate 28
And the space between the overlapped terminals and wiring is filled with an adhesive and connected.
This is because, if not provided, the space becomes larger by that amount, and the filling of the adhesive becomes insufficient, which adversely affects the reliability of the connection. Also, the thickness of the adhesive is
8 is determined by the thickness and pitch of the wiring formed.

[0016]

The liquid crystal display of the present invention has a pixel electrode,
On a first substrate having switching elements, scanning lines, signal lines, signal line connection terminals, and disconnection rescue terminals, dummy terminals electrically floating between the plurality of signal line connection terminals and the disconnection rescue terminals are provided. By providing one or more, the distance between the signal line connection terminal and the disconnection rescue terminal becomes longer, and even if the disconnection rescue terminal not connected to the integrated circuit is grounded, the signal line connection connected to the integrated circuit is made. It is possible to prevent the discharge phenomenon of the electric charge charged in the liquid crystal panel between the terminal and the disconnection rescue terminal, and to prevent the destruction of the integrated circuit and the switching element. In addition, since the dummy terminal has a simple configuration, the cost and productivity are not adversely affected.

[Brief description of the drawings]

FIG. 1 is an assembly configuration diagram of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an exploded view of a conventional liquid crystal display device.

FIG. 3 is a cross-sectional view of a conventional liquid crystal display device.

FIG. 4 is an overall configuration diagram of a conventional liquid crystal display device.

FIG. 5 is a plan view of a flexible substrate of a conventional liquid crystal display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper glass substrate (second substrate) 2 common electrode (counter electrode) 21 lower glass substrate (first substrate) 22 signal line 23 signal line connection terminal 24 TFT 25 pixel electrode 26 common electrode extraction terminal 27 disconnection rescue terminal 28 Flexible Board (Integrated Circuit Mounting Board) 29 Drive IC (Integrated Circuit) 30 Output Signal Line 31 Input Signal Line 32 Common Electrode Line 33 Disconnection Rescue Line 34 Bus Wiring Board (Wiring Board) 35 Dummy Wiring 36 Dummy Terminal 37 Scanning Line

Claims (1)

(57) [Claims] A pixel electrode is provided in a region defined by a plurality of scanning lines and a plurality of signal lines orthogonal to the plurality of scanning lines, and the pixel electrode is provided at each intersection of the plurality of scanning lines and the plurality of signal lines. A switching element is provided, a signal line connection terminal is provided at each end of the plurality of signal lines, and a disconnection rescue terminal for relieving a disconnection failure of the signal line is provided outside the plurality of signal line connection terminals. A first substrate, a second substrate provided with a counter electrode disposed to face the pixel electrode with liquid crystal interposed therebetween, an integrated circuit mounted thereon, an input wiring of the integrated circuit provided, the plurality of signal line connection terminals provided, An integrated circuit mounting substrate provided with an output wiring of the integrated circuit connected to the integrated circuit, and provided with a disconnection rescue line connected to the disconnection rescue terminal without passing through the integrated circuit; an input wiring of the integrated circuit and the disconnection Rescue A liquid crystal display device comprising: a wiring substrate electrically connected to a plurality of signal lines, wherein the first substrate has an electrically floating state between the plurality of signal line connection terminals and the disconnection rescue terminal. A liquid crystal display device comprising at least one dummy terminal.