JP2742288B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Belongs] The present invention provides a liquid crystal display panel (LCD) in a window opened in upper and lower two shield cases, and a driving circuit for the LCD is mounted on the shield case. Regarding the built-in liquid crystal display device,
In particular, the present invention relates to a technology that is effective when applied to a liquid crystal display device that is thin and requires high heat resistance and high reliability.

[Conventional technology]

For example, a conventional active matrix type color liquid crystal display device in which a thin film transistor (TFT) and a pixel electrode are one component of a pixel has a liquid crystal display panel in which a plurality of pixels are arranged in a matrix. Each pixel of the liquid crystal display panel intersects two adjacent scanning signal lines (also referred to as gate signal lines or horizontal signal lines) and two adjacent video signal lines (also referred to as drain signal lines or vertical signal lines). It is located in the area. The scanning signal line is
It extends in the column direction (horizontal direction) and is arranged in a row direction (vertical direction). On the other hand, a plurality of video signal lines extend in a row direction intersecting with the scanning signal lines, and a plurality of video signal lines are arranged in a column direction.

The liquid crystal display panel includes a first substrate on which a thin film transistor and a transparent pixel electrode, a protective film for the thin film transistor, and an alignment film are sequentially provided on a first transparent glass substrate, and a color filter and a color filter on a second transparent glass substrate. A second protective film, a common transparent pixel electrode, and an alignment film are sequentially provided.
And a liquid crystal sealed between the alignment films of both substrates,
And a liquid crystal sealing member (seal member). The transparent pixel electrode and the thin film transistor are provided for each pixel. Further, one of a source electrode and a drain electrode of the thin film transistor is connected to a transparent pixel electrode, and the other electrode is connected to a video signal line,
Further, the gate electrode is connected to the scanning signal line.

A liquid crystal display device is mainly composed of a TAB (tape autonomous circuit chip) on which an upper and lower thin shield case, a liquid crystal display panel having a thin film transistor array, and an IC (semiconductor integrated circuit chip, hereinafter referred to as a drive IC) for driving the liquid crystal display panel are mounted. It consists of a mated bonding (tape) tape and a printed circuit board (PCB). The input terminals (transparent pixel electrodes) of the scanning signal lines and video signal lines provided on the outer periphery of the liquid crystal display panel and the output outer leads (output terminals) of the TAB tape are perpendicular to the anisotropic conductive film (surface). Are connected by a film having a property that current flows in the direction but does not flow in the horizontal direction. In addition, an input outer lead (input terminal) of the TAB tape is connected to a terminal of a printed wiring board connected to a signal transmitting means external to the liquid crystal display device. Further, the electrodes (bonding pads) of the drive IC and the inner leads of the TAB tape are connected.

Each component such as a liquid crystal display panel, a TAB tape on which a drive IC is mounted, a printed wiring board, and the like are built in two upper and lower shield cases, and the two shield cases are combined and fixed by soldering. Further, each shield case is provided with a window for a liquid crystal display panel, and the liquid crystal display panel is fitted in the window so that the liquid crystal display screen can be seen from the window.

A liquid crystal display device using a TFT is described in, for example, 1984
It is described in “Nikkei Electronics” issued on September 10, 2010, page 21 and the like.

The input terminal provided on the outer periphery of the liquid crystal display panel
The prior art in which an output terminal provided on a TAB tape is connected to form a connection portion and the formed portion is pressed by an upper case and a lower case via an elastic member is disclosed in JP-A-1-91113 and JP-A-Hei. There is a 1-237685 publication.

Further, in the prior art in which a connection portion between a liquid crystal display panel and a TAB tape is tightened with a screw via an elastic member, Japanese Patent Application Laid-Open No.
There is Japanese Patent Publication No. 298318.

However, any of the prior arts has a spacer between the upper case and the lower case for supporting a space for accommodating the TAB tape and the printed wiring board. There is no description of a configuration in which a fastener is provided near the connection between the liquid crystal display panel and the TAB tape to fasten the upper case and the lower case.

[Problems to be solved by the invention]

In the prior art, the reliability of the liquid crystal display device, especially,
No consideration was given to heat resistance. That is, when the reliability of the thin film transistor was tested by placing the liquid crystal display device at a high temperature, the connection between the input terminal of the liquid crystal display panel and the output-side outer lead of the TAB tape was defective. That is, peeling occurred at the bonding portion of the anisotropic conductive film connecting both terminals. The reason for this is that the glass substrate provided with the input terminals of the liquid crystal display panel and the TAB tape have different coefficients of thermal expansion, so that a stress acts on the bonding portion.

As described above, in the conventional liquid crystal display device, when the temperature in the environment where the liquid crystal display device is placed greatly changes from a low temperature to a high temperature, or from a high temperature to a low temperature, stress acts on the connection portion due to the difference in the coefficient of thermal expansion. There has been a problem that the adhesive portion is peeled off, a connection failure occurs at the connection portion, and the liquid crystal display panel fails to light up.

An object of the present invention is to improve the heat resistance of a connection portion between an input terminal of a liquid crystal display panel and an output-side outer lead of a TAB tape, thereby improving the reliability of a product.

[Means for solving the problem]

In order to solve the above problem, a liquid crystal display device of the present invention includes a liquid crystal display panel having a thin film transistor array, an IC for driving the liquid crystal display panel, a TAB tape on which the IC is mounted, and the TAB tape. The printed circuit board on which it is placed and the upper and lower 2
A plurality of shield cases, a window for the liquid crystal display panel opened in the upper and lower two shield cases, an input terminal provided on an outer peripheral portion of the liquid crystal display panel, and the TA.
The output outer lead of the B tape is connected, the electrode of the IC is connected to the inner lead of the TAB tape, and the input outer lead of the TAB tape is connected to the output terminal of the printed wiring board. In the vicinity of the connection between the input terminal of the liquid crystal display panel and the output outer lead of the TAB tape, a fastener for fixing the two shield cases and preventing peeling of the connection is provided. It is characterized by the following.

As the fastener, for example, a rivet is used. 2 above
A plurality of openings are provided on the outer peripheral portion of the window of the shield case, and rivets are provided in the openings, and the two shield cases are fixed by the plurality of rivets.

Further, an elastic member is provided in a space between the connection portion between the input terminal of the liquid crystal display panel and the output outer lead of the TAB tape and the upper shield case, and the elastic member is provided by a tightening force of the fastener. It is desirable to press the connection portion through the interface in order to prevent peeling of the connection portion.

[Action]

In the liquid crystal display device of the present invention, the glass substrate provided with the input terminal of the liquid crystal display panel and the TAB tape having the output-side outer leads are respectively fixed to one of the shield cases, and the input terminal of the liquid crystal display panel and the TAB tape are fixed. A fastener, such as a rivet, is provided in the vicinity of the connection between the tape and the output-side outer lead, and the upper and lower shield cases are fastened and fixed by the fastener. Therefore, even if the liquid crystal display device is placed in an environment where the temperature changes drastically, it is possible to prevent stress from being generated at the connection between the input terminal of the liquid crystal display panel and the output-side outer lead of the TAB tape. Therefore, it is possible to prevent the adhesion portion of the connection portion from peeling off and to cause a connection failure, and to solve the problem that the liquid crystal display panel does not light up.

Further, an elastic member is provided in a space between the connecting portion and the upper shield case, and the connecting portion is pressed through the elastic member by the tightening force of the fastener to prevent the connecting portion from peeling. The effect can be enhanced.

〔Example〕

Embodiment 1 FIG. 2 is a plan view of an essential part of one pixel of a liquid crystal display portion of an active matrix type color liquid crystal display device to which the present invention is applied, and FIG. 3 is a section line II-II in FIG. FIG. 4 is a plan view of a principal part of a liquid crystal display section in which a plurality of pixels shown in FIG. 2 are arranged.

As shown in FIG. 3, in the liquid crystal display panel, a thin film transistor TFT1 and a transparent pixel electrode ITO1, a protective film PSV1 of the thin film transistor TFT, and a lower alignment film ORI1 for setting the direction of liquid crystal molecules are sequentially provided on a lower transparent glass substrate SUB1. A second substrate in which a black matrix BM, a color filter FIL, a protective film PSV2 of a color filter FIL, a common transparent pixel electrode ITO2 (COM), and an upper alignment film ORI2 are sequentially provided on an upper transparent glass substrate SUB2. Board and both boards SUB1, SU
It comprises a liquid crystal LC sealed between the respective alignment films ORI1 and ORI2 of B2, and a seal member SL provided around both substrates for sealing the liquid crystal LC between both substrates. The thickness of the lower transparent glass substrate SUB1 is, for example, about 1.1 mm.

In the method for manufacturing a liquid crystal display panel, the first substrate;
The second substrate and the second substrate are separately formed, and a predetermined distance is provided by interposing a spacer material (not shown) between the two substrates so as to face the alignment films ORI1 and ORI2 of the two substrates. It is assembled by overlapping, sealing the liquid crystal LC between both substrates, and sealing with a seal member SL provided around both substrates. Lower transparent glass substrate SUB1
A backlight BL is arranged on the side.

The seal member SL is provided along the entire periphery of the transparent glass substrates SUB1 and SUB2 except for the liquid crystal sealing port (not shown), and is made of, for example, epoxy resin.

The common transparent electrode ITO2 on the upper transparent glass substrate SUB2 side is, at least in one place, by a silver paste material SIL,
It is connected to the external lead-out wiring provided on the lower transparent glass substrate SUB1 side. This external wiring is connected to the transparent pixel electrode layer
It is formed of ITO1.

The alignment films ORI1 and ORI2, the transparent pixel electrode PIX, and the common transparent electrode COM are provided inside the seal member SL. Polarizing plate P
OL is lower transparent glass substrate SUB1, upper transparent glass substrate SU
It is provided on the outer surface of each of B2.

The transparent pixel electrode ITO1 and the thin film transistor TFT are provided for each pixel.

The thin film transistor TFT of each pixel has 3
It is divided into two (plurality), and is constituted by thin film transistors (divided thin film transistors) TFT1, TFT2 and TFT3.
Each of the thin film transistors TFT1 to TFT3 has substantially the same dimensions (the same channel length and width). Each of the divided thin film transistors TFT1 to TFT3 mainly includes a gate electrode GT, an insulating film GI, and an i-type (intrinsic, intrinsic).
sic, i-type semiconductor layer AS made of silicon (Si not doped with conductivity type determining impurities), a pair of source electrodes SD
1 and a drain electrode SD2. It should be understood that the source / drain is originally determined by the bias polarity between them, and the polarity is inverted during the operation in the circuit of the liquid crystal display device, so that the source / drain is switched during the operation. However, in the following explanation, one is a source for convenience,
The other is fixed and expressed as a drain. Thin film transistor
The TFT source electrode SD1 is connected to the transparent pixel electrode ITO1,
The drain electrode SD2 is connected to the video signal line DL, and
The gate electrode GT is connected to the scanning signal line GL.

The common transparent electrode COM is disposed to face a transparent pixel electrode PIX provided for each pixel on the lower transparent glass substrate SUB1 side, and is configured to be common to a plurality of pixel electrodes PIX. A common voltage is applied to the common transparent electrode COM.

Thin film transistor TF from upper transparent glass substrate SUB2 side
In order to shield light from T1 to T3, the scanning signal line G on the substrate SUB2 is used.
A black matrix BM made of a chrome layer or the like is provided in a portion corresponding to L, the video signal line DL, and the thin film transistor TFT. This allows the external natural light to be
It is possible to prevent contact with the TFT and to make the contour of the pixel clear, so that the contrast can be improved.

As shown in FIG. 4, each pixel has two adjacent scanning signal lines (gate signal lines or horizontal signal lines) GL and two adjacent video signal lines (drain signal lines or vertical signal lines) DL. (In a region surrounded by four signal lines). As shown in FIGS. 2 and 4, a plurality of scanning signal lines GL extend in the column direction (horizontal direction) and are arranged in a row direction (vertical direction). The video signal lines DL extend in the row direction and are arranged in a plurality in the column direction.

FIG. 1A is a plan view showing the appearance of the liquid crystal display device according to the present invention, and FIG. 1B is a partial cutaway showing the inside of the liquid crystal display device shown in FIG. 1A. FIG. 1 (C) is an exploded view of the shield case portion of the liquid crystal display device shown in FIG. 1 (A), and FIG. 1 (D) is a liquid crystal display panel, TAB tape, drive IC, print FIG. 1 (E) is a cross-sectional view of the liquid crystal display device shown in FIG. 1 (A) taken along section line AA, and FIG.
FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG.

First, main components in the liquid crystal display device of the present embodiment will be described. In each figure, 1 is a liquid crystal display panel, 2 is a driving IC for driving the liquid crystal display panel 1,
3 is a TAB tape on which the drive IC 2 is mounted, 4 is a TAB tape 3
Are mounted on the upper and lower shield cases, 5 and 6 are upper and lower shield cases, respectively. The upper and lower shield cases 5 and 6 are combined and fixed by soldering. 7 is a liquid crystal display window provided in the upper shield case 5, 8 is a liquid crystal display window provided in the lower shield case 6, 9 is an input terminal provided on the outer peripheral portion of the liquid crystal display panel 1, and 10 is a TAB tape 3. Output side outer lead, 1
1 is the electrode of drive IC2, 12 is the inner lead of TAB tape 3, 1
Reference numeral 3 denotes an input outer lead of the TAB tape 3, and reference numeral 14 denotes an output terminal of the printed wiring board 4. Reference numeral 15 denotes a plurality of openings provided in the outer peripheral portions of the liquid crystal display windows 7 and 8 of the upper and lower shield cases 5 and 6 so as to coincide with each other.
These are rivets for fixing the shield cases 5 and 6.

Next, the liquid crystal display device of the present invention will be described with reference to the drawings.

FIG. 1A is a plan view showing the appearance of the liquid crystal display device of this embodiment. The liquid crystal display device of the present embodiment is covered by, for example, two thin upper and lower thin metal shield cases each having a substantially square shape. In this figure, only the upper shield case 5 is shown. Upper and lower two shield cases 5,
A plurality of openings 15 (invisible here because of the rivets 16) are provided on the outer periphery of the liquid crystal display windows 7, 8 of FIG. 6 (the lower shield case 6 and the liquid crystal display window 8 are not visible in this figure). A rivet 16 is provided in each opening. The two shield cases 5 and 6 are fixed by the plurality of rivets 16. Reference numeral 17 denotes a concave portion provided on the surface of each of the shield cases 5 and 6 around each of the openings 15, and by providing this concave portion 17, when the rivet 16 is attached, the end of the rivet 16 becomes the shield case 5, 6 does not protrude above the surface of the rivet 16 so that the rivet 16 is not in the way.
(See FIGS. (E) and (F)). Reference numeral 18 denotes a positioning hole, and 19 denotes a flexible printed wiring board (FPC) that is connected to the outside and receives signals from the outside.

The internal structure of the liquid crystal display device is shown by a partially cut-away plan view of FIG. The liquid crystal display panel 1 is fitted and fixed to a portion of the lower shield case 6 at a liquid crystal display window 8 (not visible here; see FIGS. 1C and 1D). A plurality of TAB tapes 3 on each of which a drive IC 2 is mounted are provided on the surface of the printed wiring board 4 on the outer periphery of the three sides of the liquid crystal display panel 1 (in this figure, only a part is cut off). Therefore, only the TAB tape on the outer periphery of the two sides is shown). The TAB tape 3 is fixed to a printed wiring board 4, and the printed wiring board 4 is fixed to a lower shield case 6. Although not clearly shown here, the liquid crystal display panel 1 is provided between the liquid crystal display panel 1 and the TAB tape 3, that is, on the outer peripheral portion of the liquid crystal display panel 1.
(See FIG. 1 (D)). Near this connection,
In this embodiment, two shield cases 5 and 6 are fixed between the TAB tapes 3 outside the connection portion, and a plurality of rivet openings 15 and a plurality of rivets for preventing peeling of the connection portion. 16 are provided.

FIG. 1 (C) shows an exploded view of the shield case. Upper shield case 5 and lower shield case 6
Between them, an upper insulating seal 21, a spacer 22, a printed wiring board 4, and a lower insulating sheet 23 are provided.

FIG. 1 (D) shows a liquid crystal display panel 1 and a TAB tape 3
2, an electrical connection between the TAB tape 3 and the drive IC 2, and an electrical connection between the TAB tape 3 and the printed wiring board 4.

As described above, the liquid crystal display panel 1 includes the lower transparent glass substrate SUB1, the upper transparent glass substrate SUB2, the liquid crystal LC sealed between the two, and the sealing member SL. Lower glass substrate
The input terminal 9 of the liquid crystal display panel 1 is provided on the rear edge of the SUB1 (the outer peripheral portion of the liquid crystal display panel 1). The input terminals 9 extend in the column direction as described above, and the end portions of the plurality of scanning signal lines GL arranged in the row direction and the video signal extending in the row direction and arranged in the column direction. End of line DL (fourth
See figure).

The input terminals 9 of the liquid crystal display panel 1 and the output-side outer leads 10 of the TAB tape 3 are connected by an anisotropic conductive film 24.

The inner lead 12 of the TAB tape 3 and the electrode 11 of the drive IC 2 are connected.

The input outer lead 13 of the TAB tape 3 and the output terminal 14 of the printed wiring board 4 are connected by soldering.

FIG. 1 (E) shows a cross-sectional view taken along line AA of FIG. 1 (A). FIG. 2 shows a connection portion between an input terminal 9 d of a video signal line (drain signal line) DL of the liquid crystal display panel 1 and an output-side outer lead 10 of the TAB tape 3.

FIG. 1 (F) shows a cross-sectional view taken along line BB of FIG. 1 (A). This figure shows a connection portion between the input terminal 9g of the scanning signal line (gate signal line) GL of the liquid crystal display panel 1 and the output outer lead 10 of the TAB tape 3.

In FIGS. 1 (E) and 1 (F), the drive IC 2 overlaps the position of the rivet 16 and is not shown.

Two shield cases 5 and 6 are fixed by an opening 15 and a rivet 16 provided in the vicinity of a connection portion between the input terminals 9 d and 9 g of the liquid crystal display panel 1 and the output outer lead 10 of the TAB tape 3. Thereby, the input terminal 9 of the liquid crystal display panel 1
d, 9g and the connection part of the output side outer lead 10 of the TAB tape 3 is peeled off (more specifically, the bonding part of the anisotropic conductive film connecting the input terminals 9d, 9g and the output side outer lead 10 of the TAB tape 3). Here, the bonding portion of the anisotropic conductive film is not shown in the figure, and the peeling is prevented (see FIG. 1D). In addition, the subsequent portion (that is, the input terminals 9d and 9g and the output side outer lead
An elastic member 25 made of silicon rubber or the like is provided in a space between the spacer 22 (see FIG. 1 (C)) and the spacer 22 (see FIG. 1 (C)). 5, 6, the spacer 22, the lower glass substrate, the elastic member 25 and the like are used to press the connection portion.

As described below with reference to the drawings, in the liquid crystal display device of the present embodiment, the outer peripheral portions of the liquid crystal display windows 7 and 8 of the upper and lower two shield cases 5 and 6 (that is, the input terminals 9 and 9 of the liquid crystal display panel 1). A plurality of openings 15 and rivets 16 are provided in the vicinity of the connection portion of the TAB tape 3 with the output-side outer lead 10, and the two shield cases 5 and 6 are formed by the plurality of rivets 16.
Was tightened and fixed, and the connection portion was pressed via the elastic member 25. Thus, even if the liquid crystal display device is placed in an environment where the temperature changes drastically, the glass substrate is fixed to the lower shield case 6 and the TAB tape 3 is attached to the printed wiring board 4.
Since the glass substrate and the TAB tape are fixed to the lower shield case 6 via the through hole, it is possible to prevent a stress from acting on the connection due to a difference in the coefficient of thermal expansion between the glass substrate and the TAB tape. Accordingly, the input terminal 9 of the liquid crystal display panel 1 and the output outer lead 1 of the TAB tape 3
It was possible to prevent the adhesive portion of the anisotropic conductive film 24 from being peeled off at the connection portion with 0, and to solve the problem that the liquid crystal display panel 1 could not be turned on.

Further, as shown in FIGS. 1E and 1F, in the present invention, the space for housing the printed wiring board 4 and the TAB tape 3 of the upper and lower two shield cases 5, 6 is the printed wiring board 4 , An upper insulating sheet 21 and a lower insulating sheet 23, and are supported by a spacer 22.
Fastener 16 near the connection between the liquid crystal display panel and the TAB tape, rather than supporting the space between the shield cases 5 and 6.
Is provided, a strong force is applied to the connection portion by the leverage principle with the point at which the spacer 22 supports the space as a fulcrum, and peeling of the connection portion can be reliably prevented.

Further, in the present embodiment, the rivet 16 is used as a fastener for fixing the two shield cases 5 and 6 and preventing the connection portion from peeling, so that the fastening force is strong. Further, since the rivet can be easily attached, the workability of fastening the fastener is good. Further, in the above embodiment, a rivet is provided as a fastener, but other fasteners may be used. Hereinafter, embodiments using other fasteners will be described.

Embodiment 2 FIG. 5 is a cross-sectional view showing a main part of a cross-sectional view of a liquid crystal display device similar to FIG. 1 (E) for illustrating a second embodiment of the present invention. In the figure, 51 is a bolt, 52 is a nut, and 53 is a washer. As shown in this figure, a bolt and nut may be used as a fastener. According to this embodiment, the connection between the liquid crystal display panel and the TAB tape is tightened with a strong force by the bolt and the nut, that is, the screw.
Can reliably be prevented from peeling off.

Further, since screws such as bolts and nuts can be easily removed, the shield cases 5, 6 can be easily disassembled, and repairs and the like are easy.

Embodiment 3 FIG. 6 is a cross-sectional view of a liquid crystal display device similar to FIG. 1E for illustrating a third embodiment of the present invention. As shown in this figure, a spring member 61 made of, for example, metal or the like and having a “U” cross section may be used as a fastener.

Embodiment 4 FIGS. 7A and 7B are a schematic perspective view and an enlarged view of a main part, respectively, for showing a fourth embodiment of the present invention. In this embodiment, a cut 74 is formed in the upper shield case 5,
By bending in the direction of arrow A, a plurality of fasteners 76 having the same shape as the cutouts 74 are integrally formed in the upper shield case 5, only three of which are shown in FIG. Around these, these fasteners
A plurality of elongated openings 75 into which the fasteners 76 are inserted are formed at positions of the lower shield case 6 corresponding to the openings 76. Fastener
After the insertion 76 is inserted into the opening 75, the distal end 77 of the fastener 76 is bent to fix the upper shield case 5 and the lower shield case 6 together. In addition, the fastening tool 76 is formed in the lower shield case 6,
The opening 75 may be formed in the upper shield case 5.

According to the present embodiment, since the fastener is integrated with the upper or lower case, the number of members is reduced, and the cost of the liquid crystal display device is reduced.

Further, since the end portion 77 of the fastener 76 is bent to fix the upper shield case and the lower shield case, removal is easy and repair is easy.

Fifth Embodiment FIGS. 8A and 8B are a schematic perspective view and an enlarged view of a main part, respectively, showing a fifth embodiment of the present invention. In this embodiment, a notch 84 is formed in the fixing spacer 80, and a plurality of fasteners 86 having the same shape as the notch 84 are formed integrally with the fixing spacer 80 by bending in the direction of arrow A (FIG. In the figure, only three fasteners are shown and the outside is omitted).
A plurality of elongated openings 85 into which 86 is inserted are formed.
The upper shield case 5 covers the fixing spacer 80 and is fixed to the fixing spacer 80. After the fastener 86 is inserted into the opening 85, the distal end portion 87 of the fastener 86 is bent to fix the upper shield case 5 and the lower shield case 6 together.

As described above, the present invention has been specifically described based on the above embodiments, but the present invention is not limited to the above embodiments,
Of course, various changes can be made without departing from the scope of the invention.

For example, in the above embodiment, the elastic member 25 is provided in a space between the connection portion between the input terminal 9 of the liquid crystal display panel 1 and the output outer lead 10 of the TAB tape 3 and the upper shield case 5, and Although the connecting portion is pressed via the elastic member 25 by the tightening force, the elastic member may not be interposed. However, it is desirable to press the connection portion because pressing the connection portion has a greater effect of preventing separation of the connection portion. Instead of being pressed by the elastic member 25, another member, for example, by adjusting the thickness of the spacer 22,
May be pressed. Also, the fasteners shown in FIGS. 1 (E), 1 (F), and 5 to 8 may be used together.

〔The invention's effect〕

As described above, in the liquid crystal display device of the present invention, since fasteners such as rivets are provided near the connection portion between the input terminal of the liquid crystal display panel and the outer lead on the output side of the TAB tape, the liquid crystal display device has a temperature change. Even in an intense environment, it is possible to prevent the connection portion from peeling off, resulting in poor connection, and to solve the problem that the liquid crystal display panel cannot be turned on.

[Brief description of the drawings]

FIG. 1A is a plan view showing the appearance of the liquid crystal display device according to the present invention, and FIG. 1B is a partially cut-away plan view showing the inside of the liquid crystal display device shown in FIG. 1A. Fig. 1 (C)
Is an exploded view of the shield case of the liquid crystal display device shown in FIG. 1 (A), and FIG. 1 (D) is a liquid crystal display panel, TAB.
FIG. 1 (E) is a view showing each connection portion of a tape and a printed wiring board, and FIG. 1 (E) is a view of the liquid crystal display device shown in FIG.
FIG. 1 (F) is a sectional view taken along a cutting line, and FIG. 1 (A)
Sectional view of the liquid crystal display device shown in FIG.
FIG. 2 is a plan view of a main part of one pixel of a liquid crystal display portion of an active matrix type color liquid crystal display device to which the present invention is applied, and FIG. 3 is a sectional view taken along the line II-II of FIG. FIG. 4 is a plan view of an essential part of a liquid crystal display unit in which a plurality of pixels shown in FIG. 2 are arranged, and FIG. 5 is a sectional view of an essential part showing a second embodiment of the present invention. FIG. 6 is a sectional view of a liquid crystal display device similar to FIG. 1 (E) for illustrating a third embodiment of the present invention, and FIGS. 7 (A) and 7 (B) are diagrams of a fourth embodiment of the present invention. FIG. 9 is a schematic perspective view, an essential part enlarged view, and
(A) and (B) are a schematic perspective view and a main part enlarged view, respectively, showing a fifth embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel 2 ... Drive IC 3 ... TAB tape 4 ... Printed wiring board 5 ... Upper shield case 6 ... Lower shield case 7, 8 ... Liquid crystal display window 9 ... Input to liquid crystal display panel Terminal 10: TAB tape output side outer lead 11: Drive IC electrode 12: TAB tape inner lead 13: TAB tape input side outer lead 14: Printed wiring board output terminal 15: Opening 16 ... Rivets 17 ... Recess 18 ... Positioning holes 19 ... Flexible printed wiring board 22 ... Spacer 24 ... Anisotropic conductive film 25 ... Elastic member 51 ... Bolt 52 ... Nut 53 ... Washer 61 ... … Spring member 75, 85… Opening 80… Fixing spacer 76, 86… Fastener

Continuing from the front page (72) Inventor Kenyoshi Suzuki 3300 Hayano, Mobara-shi, Chiba Prefecture Inside Mobara Plant, Hitachi, Ltd. (72) Inventor Tsutomu Isono 3681-Hayano, Mobara-shi, Chiba Hitachi Device Engineering Co., Ltd. (72) Invention Person Kazumi Matsumoto 3300 Hayano, Mobara-shi, Chiba Pref. In the Mobara factory of Hitachi Ltd. (56) References JP-A-61-32085 (JP, A)

Claims (5)

(57) [Claims] A liquid crystal display panel in which liquid crystal is sealed between a lower transparent glass substrate and an upper transparent glass substrate; a TAB tape on which an IC for driving the liquid crystal display panel is mounted;
A printed wiring board on which the TAB tape is mounted, and a liquid crystal display device comprising an upper case and a lower case, which covers an outer peripheral portion of the liquid crystal display panel and accommodates the TAB tape and the printed wiring board, An input terminal provided on an outer peripheral portion of the liquid crystal display panel and an output terminal provided on the TAB tape are connected via an anisotropic conductive film to form a connection portion. An outer peripheral portion and the TAB tape are sandwiched between the upper case and the lower case, and a spacer is provided between the upper case and the lower case to support a space for accommodating the TAB tape and the printed wiring board. A liquid crystal display device provided with a fastener for tightening the upper case and the lower case closer to the connection portion than to support the space between the upper case and the lower case. Place. 2. The liquid crystal display device according to claim 1, wherein an elastic member is provided between said connecting portion and said upper case. 3. The liquid crystal display device according to claim 1, wherein said fastener is a rivet. 4. The liquid crystal display device according to claim 1, wherein said fastener is a screw. 5. The fastening tool is integrated with one of the upper case and the lower case, an opening is provided in the other of the upper case and the lower case, and the fastening tool is passed through the opening. 2. The liquid crystal display device according to claim 1, wherein the upper case and the lower case are fastened by bending the fastener.