JPH0317629A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve the workability to connect TABs to wiring boards and to mount chip parts thereon by providing reinforcing plates on the wiring boards. CONSTITUTION:A video signal (horizontal) driving circuit is divided to upper and lower two groups which are mounted on FPC (flexible printed circuit) substrates 10a, 10c. A vertical scanning circuit is also mounted on the FPC substrate 10b. Horizontal signal lines DL are connected alternately to the upper and lower FPC substrates 10a, 10c in order to allow for a sufficiently large pitch of the connecting terminals. The reinforcing plates 25 are provided in the junctions of the TABs 9 of FPCs 10a to 10c and the parts to be mounted with the chip parts 8 to reinforce the FPCs from the rear and, therefore, the connection of the TABs 9 and the mounting of the chip parts 8 are stably and easily executed and the workability is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display device, particularly a liquid crystal display panel (LCD) provided in a window opened in a shield case, and an opening wiring section of the liquid crystal display panel. The present invention relates to a flat type liquid crystal display device built into the above-mentioned shield case, and particularly relates to a technique that is effective when applied to a liquid crystal display device that is required to be thin, have high heat resistance, and high reliability.

[Conventional technology]

For example, a conventional active matrix color liquid crystal display device in which a thin film transistor (TPT) and a pixel electrode are used as constituent elements 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 is formed by the intersection of 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). located within the area. The scanning signal lines extend in the column direction (horizontal direction) and are arranged in the row direction (vertical direction). On the other hand, the video signal lines extend in the row direction intersecting the scanning signal lines, and are arranged in plural in the column direction.

The liquid crystal display panel includes a first substrate on which a thin film transistor, 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 substrate on which a protective film, a common transparent pixel electrode, and an alignment film are sequentially provided; a liquid crystal sealed between each alignment film of both substrates; and sealing of the liquid crystal provided at the periphery of the panel. It is composed of a member (sealing material). A transparent pixel electrode and a thin film transistor are provided for each pixel.

Further, one of the source electrode and drain electrode of the thin film transistor is connected to a transparent pixel electrode, the other electrode is connected to a video signal line, and the gate electrode is connected to a scanning signal line. .

A conventional liquid crystal display device, for example, mainly has two thin shield cases (upper and lower) and a thin film transistor array.
TAB is equipped with a liquid crystal display panel that is attached to a window provided in a shield case, and a semiconductor integrated circuit chip (hereinafter referred to as an operation IC) that operates the liquid crystal display panel.
tape automated bonding, a type of flexible printed wiring board such as polyimide), and TAB
Printed circuit board (PCB) equipped with chip components and chip components.
It is composed of the following. The input terminals of the scanning signal line and video signal line provided on the outer periphery of the liquid crystal display panel and the output side outer lead (output terminal) of the TAB are connected to an anisotropic conductive film (current flows in the direction perpendicular to the surface). However, they are electrically connected by a membrane that does not flow horizontally. Further, the input-side outer lead (input terminal) of the TAB and the terminal of the PCB connected to external signal sending means of the liquid crystal display device are electrically and mechanically connected by soldering. Furthermore, the electrode (bonding pad) of the housing IC and the inner lead of the TAB are connected.

Each component, such as a liquid crystal display panel, a TAB on which a display IC is mounted, and a PCB, is housed in a shield case, 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 into this window so that the liquid crystal display screen can be seen through the window.

Note that liquid crystal display devices using TPT, for example,
"Nikkei Electronics" 21, published September 10, 1984
It is written on the page etc.

[Problem to be solved by the invention]

In the conventional technology, no consideration is given to the generation of stress due to the difference in expansion rate between a certain liquid crystal display panel and the PCB, which is the swing gland of the panel, from the glass member.
Stress wrinkles appear on TAB, and T is the weakest in strength.
AB input side outer lead (code 14 in Figure 1(E))
There is a problem with the connection being disconnected.

An object of the present invention is to provide a liquid crystal display device that can prevent disconnection of the input side outer lead of the TAB.

[Means to solve the problem]

In order to solve the above problems, the liquid crystal display device of the present invention includes a liquid crystal display panel, and a plurality of TABs that are electrically connected to the liquid crystal display panel and are equipped with an operation IC that operates the liquid crystal display panel. and a wiring board that is electrically connected to the plurality of TABs and on which the plurality of TABs are mounted, the wiring board being made of an elastic member, and the connection part of the plurality of TABs on the wiring board having a plurality of It is characterized in that a first reinforcing plate is arranged.

A chip component is further mounted on the wiring board, and a second reinforcing plate is disposed on a mounting portion of the chip component of the wiring board.

That is, in the present invention, the wiring board on which the TAB and chip components are mounted is made of an elastic member, so that stress can be absorbed. However, a wiring board made of an elastic material alone does not have enough strength, so when connecting a TAB to the wiring board or mounting chip components, the wiring board is flexible and unstable, making connection and mounting difficult. Therefore, reinforcing plates were provided at the TAB connection area and chip component mounting area, and gaps were provided between the reinforcing plates.

[Effect]

In the liquid crystal display device of the present invention, since the opening wiring part of the liquid crystal display panel is constructed from an elastic member and a certain wiring board, the gap in the longitudinal direction caused by the difference in expansion coefficient between the liquid crystal display panel and the opening wiring part can be reduced. The stress is absorbed by the bending of the flexible wiring board, and the input side outer lead of the TAB can be prevented from being cut.

Furthermore, since reinforcing plates are provided at the TAB connection portion and the chip component mounting portion of the wiring board, the TAB connection and chip component mounting can be performed stably and easily, resulting in good workability.

Other objects and features of the invention will become apparent from the following description with reference to the drawings.

〔Example〕

Fig. 2 is a plan view of a main part of one pixel of the liquid crystal display section of an active matrix color liquid crystal display device to which the present invention is applied, and Fig. 3 is a plan view taken along the section line ■-■ in Fig. 2. 4 is a cross-sectional view, and FIG. 5 is a plan view of the main part of the liquid crystal display section in which a plurality of pixels shown in FIG. 2 are arranged. The main part plan view depicting only the pixel electrode and color filter layer shown in Fig. 4, and Fig. 6 are as follows.
FIG. 3 is an equivalent circuit diagram of a liquid crystal display section.

<Pixel Arrangement> As shown in Figure 2, each pixel is connected to two adjacent scanning signal lines (gate signal lines or horizontal signal lines) and two adjacent video signal lines (train signal lines or horizontal signal lines). (vertical signal line) DL (in the area surrounded by four signal lines).

As shown in FIGS. 2 and 4, the scanning signal line OL is
Extends in column direction (horizontal direction) and row direction (vertical direction)
Multiple books are placed in the area. The video signal lines DL extend in the row direction, and a plurality of video signal lines DL are arranged in the column direction.

<Overall Structure of Panel Cross Section> As shown in FIG. 3, the liquid crystal display panel includes a thin film transistor TFT1 and a transparent pixel electrode [T○1,
A first substrate on which a protective film PS1 of the thin film transistor TPT and a lower orientation 110R1 for setting the orientation of liquid crystal molecules are sequentially provided, and a black matrix BM and a color finer film FIL on an upper transparent glass substrate SUB2. , a second substrate on which a protective film PSV2 of color finoreta FIL, a common transparent pixel electrode rTO2, and an upper alignment film ○RI2 are sequentially provided, and each alignment film ○R of both substrates SUBI and SUB2.
It is composed of a liquid crystal LC sealed between II and ORI2, and a sealing material SL provided around both substrates to seal the liquid crystal LC between both substrates.

The thickness of the lower transparent glass substrate SUBI is, for example, about 1.1 nm.

The center part of FIG. 3 shows a cross section of one pixel, while the left side shows a cross section of the left side forest part of the transparent glass substrates SUBI and SUB2 where external lead wiring is present.

The right side shows a cross section of the right edge portion of the transparent glass substrates SUBI and SUB2 where no external lead wiring is present.

In the method for manufacturing a liquid crystal display panel, the first substrate and the second substrate are formed separately, and a spacer material ( (not shown), the two substrates are stacked at a predetermined distance, the liquid crystal LC is sealed between the two substrates, and the two substrates are sealed by a sealing material SL provided around the two substrates. A backlight BL is arranged on the lower transparent glass substrate SUBI side.

The sealing materials SL shown on the left and right sides of Fig. 3 are as follows:
It is configured to seal the liquid crystal LC, is provided along the entire edges of the transparent glass substrates SUBI and SUB2 except for the liquid crystal sealing opening (not shown), and is made of, for example, epoxy resin.

Common transparent electrode ITO2 on the upper transparent glass substrate SUBZ side
is connected to an external lead wiring provided on the lower transparent glass substrate SUB1 side at least in one place by a silver paste material SIL. This external lead wiring is formed of the transparent pixel electrode layer IT○1.

Orientation films ORII and ORI2, transparent pixel electrode IT○1
, the common transparent electrode IT○2 is provided inside the sealing material SL. The polarizing plate POL has a lower transparent glass substrate SUBI
, are provided on the outer surface of each of the upper transparent glass substrates SUB2.

What is the transparent pixel electrode ITOI and the thin film transistor TPT?
It is provided for each pixel.

<Thin film transistor TPT> The thin film transistor TPT of each pixel has three
The thin film transistor (divided thin film transistor) TFTI. It is composed of TFT2 and TFT3. Each of the thin film transistors TPTI to TFT3 has substantially the same dimensions (the channel length and width are the same). Each of the divided thin film transistors TPT1 to TFT3 mainly has a gate electrode GT.
．． Gate insulating film GI, i-type (intrinsic)
, a pair of source electrodes SDI and drain electrodes SD2. Note that the source and drain are originally determined by the bias polarity between them, and in the circuit of a liquid crystal display device, the polarity is reversed during operation, so it should be understood that the source and drain are interchanged during operation. However, in the following explanation, for convenience, one side is fixedly expressed as a source and the other side is fixedly expressed as a drain.

The source electrode SDI of the thin film transistor TPT is connected to the transparent pixel electrode ITOI, the drain electrode SD2 is connected to the video signal line DL, and the gate electrode GT is connected to the scanning signal line OL.

<<Light-shielding film BM>> In order to shield the thin-film transistors TPTI to 3 from the upper transparent glass substrate SUB2 side, the scanning signal line GL, video signal line DL, and thin-film transistor TP of the substrate SUB2 are used.
A black matrix BM made of a chromium layer or the like is provided in a portion corresponding to T. As a result, the outline of each pixel becomes clear due to the light shielding film BM, and the contrast is improved. In other words, the light shielding film BM has two functions: shielding the semiconductor layer AS from light and serving as a black matrix.

In addition, attach the backlight to the SUB2 side, and
can also be set to the wi festival side (externally exposed side).

<Common electrode IT○2> Common transparent electrode IT○2 is connected to the lower transparent glass substrate SUBI
It is arranged opposite to the transparent pixel electrode ITOI provided for each pixel on the side, and is configured to be common to a plurality of pixel electrodes IT○.

A common voltage is applied to this common transparent electrode IT○2.

<Color Filter FIL> The color filter FIL is constructed by coloring a dyed base material formed of a resin material such as an acrylic resin with a dye.

As shown in Fig. 5, the color filter FIL is formed in a dot shape for each pixel at a position facing the pixel, and is colored differently (Fig. 5 shows the third conductive film layer d3 in Fig. 4). Only the color filter layer FIL is depicted, and the red R, green G, and blue B filters are hatched at 45° and 135°, respectively).

<<Pixel Arrangement>> As shown in FIGS. 4 and 5, a plurality of pixels of the liquid crystal display section are arranged in the same column direction as the direction in which the scanning signal line GL extends, and are arranged in pixel columns x1, X2, and X3. ,X4,...
It consists of each of the following. Each pixel column X1, X2, X3
, X4, . . . have thin film transistors TFT1 to TFT3 and transparent pixel electrodes E1 to E3 arranged in the same position. In other words, odd pixel row Xi
．． For each pixel X3,...
]~E3 are arranged on the right side. Even-numbered pixel columns X2 . . . adjacent to each odd-numbered pixel column Xi, X3, . X4. . . . is composed of pixels obtained by inverting the respective pixels of the odd-numbered pixel columns X1, X3, . . . symmetrically with respect to the extending direction of the video signal line DL. . That is, pixel row X2. X4,
Each pixel of... is a thin film transistor TPTI
~The arrangement position of TFT3 is on the right side, transparent pixel electrodes E1 to E3
The placement position is configured on the left side. And pixel row X2
．． Each pixel of X4,... is a pixel column X↓, X3
, . . . are shifted (shifted) by half a pixel interval in the column direction. In other words, if each pixel interval of pixel row X is 1.0 (1.0 pitch), then the next pixel row They are shifted by 0.5 pixel intervals (0.5 pitch). The video signal line DL, which extends between each pixel in the row direction, extends by half a pixel interval (0.
5 pitches) so as to extend in the row direction.

As a result, as shown in FIG. 5, a pixel formed with a predetermined color filter in the previous pixel row The pixels formed with the same color filter (for example, the pixels formed with the red filter R of pixel row X4) are separated by 1.5 pixel intervals (1.5 pitch), and the RGB color filter FIL has a triangular arrangement. Color filter FI
The triangular arrangement structure of RGB of L can improve the color mixing of each color, and therefore can improve the resolution of a color image.

Moreover, since the video signal line DL extends in the column direction by only half a pixel interval between each pixel column X, it does not intersect with the adjacent video signal line DL. Therefore, it is possible to eliminate the routing of the video signal line DL and reduce the area occupied by the video signal line DL, and it is also possible to eliminate the detour of the video signal line DL and eliminate the multilayer wiring structure.

<<Equivalent circuit of entire display panel>> The equivalent circuit of this liquid crystal display device is shown in FIG. X
i+IG, . . . are video signal lines (horizontal signal lines) DL connected to the pixels in which the green filter G is formed. X
iB. Xi+lB, . . . are video signals IIADL connected to the pixels in which the blue filter B is formed. Xi
+IR. Xi+2R, . . . are video signal lines DL connected to pixels in which the red filter R is formed. These video signal lines DL are driven by video signal driving circuits (horizontal driving circuits) provided above and below the liquid crystal display panel. Y
i is a scanning signal line (vertical signal line) GL that selects the pixel column X1 shown in FIGS. 4 and 5. Similarly, Yj+1
, Y x + 2, ... are the pixel columns X2,
This is a scanning signal line GL that selects each of X3, . These scanning signal lines GL are connected to a vertical scanning circuit (vertical translation circuit) provided on the left side of the liquid crystal display panel. To the right of the liquid crystal display panel is a power supply circuit PS and a circuit C that converts information for the CRT (cathode ray tube) from the host (upper processing unit) into information for the TPT liquid crystal display panel.
NVs are provided, and they are mounted on PCB 1 1, which will be described later. The video signal (horizontal) display circuit is divided into two groups, upper and lower, and mounted on an FPC (flexible printed circuit) board 10a, loc, and the vertical scanning (vertical swing) circuit is similarly mounted on the FPC board 10b. ing.

The horizontal signal lines DL are alternately connected to the upper and lower FPC boards 10a and 10c in order to ensure a sufficiently large connection terminal pitch. The power supply circuit PS is externally connected to OV. 5V and 25V
new DC potential sources of 13V and 21V are created. The vertical scanning circuit board 10b includes a power supply circuit p.
Direct current potentials of OV, 5V and 25V are supplied from s to the wiring formed on the FPC board 10a, and a binary gap pulse of OV and 25V is applied to the scanning line Yi. DC potentials of OV, 5V, 13V, and 21V are supplied from the power supply circuit ps to the video signal operation circuit boards 10a and 10C, and three-value pulses of 5V, 13V, and 21V are applied to the signal line Xi. . This example is based on a VDT (Video Display Terminal) with 8-gradation color display.
This is the case for deoDisplay Tero+inal)).

One horizontal scanning IH and one vertical scanning IV are connected to the vertical driving circuit board 10b from the CRT-+TFT conversion circuit CNV via wiring formed on the lower horizontal opening circuit board IOC.
Two synchronization pulses corresponding to are supplied. 1(A) to 1(J) are diagrams showing one embodiment of the liquid crystal display device of the present invention, respectively. FIG. 1(A) is a plan view showing the internal structure of the liquid crystal display device, and FIG. B), (C). (D
) are a plan view, a front view, and a side view showing the external appearance of the liquid crystal display device, FIG. F
), (G), and (H) are the plan views of each FPC, and the first
FIG. 1(I) is a sectional view of the FPC, and FIG. 1(J) is a plan view showing the connection portion of the FPC.

The liquid crystal display device of the present invention will be explained based on each episode.

The external appearance of the liquid crystal display device of this embodiment is shown in the plan view, front view, and side view of FIGS. 1(B) to 1(D). The liquid crystal display device of this embodiment is covered with two thin thin upper shield cases 1 and lower shield cases 2 made of metal, for example, under a rectangular shape, and these are combined and fixed by soldering or the like.

Liquid crystal display windows 3 and 4 provided in shield cases 1 and 2 (
A liquid crystal display panel 5 is attached to the display panel 4 (not shown here). Inside the shield cases 1 and 2 are the residence ICs. T
AB. FPC. Free-time wiring circuit such as PCB, Wi source circuit P
S and peripheral circuits CNV, etc. are built-in. 6 is a connector portion into which a connector for sending data from a personal computer or the like is inserted.

The plan view of FIG. t(A) shows the internal structure of the liquid crystal display device of this embodiment. 7 is an actuator C for moving the liquid crystal display panel 5, 8 is a chip component of passive elements such as a capacitor and a resistor, and 9 is a TA on which the motion IC 7 is mounted.
B, 10a. 10b and 10c are FPCs (flexible printed circuit boards) made of an elastic material such as polyimide, on which the TAB 9 and the chip component 8 are connected and mounted;
PC10a and 10c are video signal side (horizontal signal side) Fpc
, 10b is a scanning signal side (vertical signal side) FPC. 1
Reference numeral 1 indicates a PCB made of glass epoxy or the like, which is equipped with a conversion circuit CNV and a power supply circuit PS for converting CRT data sent from a personal computer or the like via the connector section 6 into data for a TPT liquid crystal display device; LCD display panel 5
Input terminals of the liquid crystal display panel 5 provided on the outer periphery of three sides, 13 is an output terminal of the TAB 9 (output side outer lead)
, l4 is the input terminal of TAB9 (input side outer lead),
15 is an output terminal of the FPCs 10a to 10c.

Reference numeral 25 denotes a plurality of reinforcing plates provided at the connection portion of the TAB 9 (location of the output terminal 15 of the FPC) and the mounting portion of the chip component 8 in the FPCs 10a to 10c. Divided in the long axis direction of the FPC,
A gap is provided between each reinforcing plate 25.

26 is a connecting part between each FPC 10a to 10c; each FPC
are provided at both ends.

The liquid crystal display panel 5 is fitted and fixed into the liquid crystal display window of the lower shield case 2. A plurality of TAB9s equipped with the ICs 7 are arranged around the outer periphery of the three sides of the liquid crystal display panel 5, and are connected to the liquid crystal display panel 5 and the FPCIOa~
10c. FPC10a~10
c are attached to the lower shield case 2, respectively. For example, small holes l6 penetrating through the FPCs 10a to 10c and the reinforcing plate 25 are drilled at several predetermined locations, and these holes 16 are connected to pins l6 integrally provided in the lower shield case 2.
7, the FPCs 10a to 10c are fixed to the lower shield case 2.

A PCB 11 is mounted on the outer periphery of the remaining side of the liquid crystal display panel 5, and is equipped with a power supply circuit and a conversion circuit for converting data for a CRT into data for a TPT liquid crystal display device. The FPCs 10a and 10c located at the top and bottom of the figure are provided with a video signal disturbance circuit, and the FPC 10 located at the left
A vertical scanning circuit is provided in b, and PCB1 located on the right
．． 1 includes an electric g circuit ps and a CRT-+TFT conversion circuit CN.
V is provided (see the equivalent circuit diagram in Figure 6. The equivalent circuit diagram in Figure 6 is written corresponding to Figure 1 CA))
. In addition, the reason why we used FPC<PCBll on the outer periphery of one side is that there is no problem of lead wire breakage unlike FPC on three sides, and this is also where mounted components such as power supply circuits and conversion circuits are soldered. This is because there are many. But instead of PCB F
PC and reinforcing plates may also be used.

Since TAB9 and chip capacitor 8 are thin,
Although it is mounted on the FPC boards 10a to 10c, the power supply circuit 1ps and the conversion circuit CNV are not chip-shaped, but are sealed with plastic or ceramic, and are composed of integrated circuits (ICs) with external leads, transistors, passive components, etc. Since it is hollow, it is thick and is attached to the back side of the PCB, so that the display surface (top surface) is as flat as possible.

The chip capacitor 8 is a bypass capacitor for ripple removal electrically connected to the DC potential wiring from the power supply circuit PS mentioned above, and in order to increase mounting efficiency,
They are placed in the four corners.

FIG. 1(E) shows an electrical connection between the liquid crystal display panel 5 and the TAB 9, an electrical connection between the TAB 9 and the active IC 7,
Electrical connections between TAB9 and FPCIOa to 10c are shown.

The liquid crystal display panel 5 has a lower transparent glass substrate SUBI. It is composed of an upper transparent glass substrate SUB2, and a liquid crystal LC is sealed between both transparent glass substrates and sealed with a sealing material SL. 4 is a liquid crystal display window provided in the lower shield case 2; 12 is an input terminal of the liquid crystal display panel 5 provided on the outer periphery of the liquid crystal display panel 5 (on the edge of the lower glass substrate SUBI); is T
The output side outer lead of AB9, 18 is the electrode of the moving IC 7, 19 is the inner lead of TAB9, 14 is the input side outer lead of TAB3, and 15 is the output terminal of the FPCs 10a to 10c. Note that the input terminals 12 of the liquid crystal display panel 5 extend in the column direction as described above, and connect to the ends of the scanning signal lines OL, which are arranged in a plurality in the row direction. This is the end of a plurality of video signal lines DL arranged in the area.

The input terminal 12 of the liquid crystal display panel 5 and the output side outer lead 13 of the TAB 9 are connected by an anisotropic conductive film 20.

The inner lead 19 of the TAB 9 and the electrode 18 of the motor IC 7 are connected.

TAB9 input side outer lead ↓4 and FPC10a
-10c are electrically and mechanically connected to the output terminals 15 by soldering.

Figure 1 (F), (G). Plan view of (H) and Figure I (I)
According to the cross-sectional view of each F P C 1 0 a ~ 1 0
c is shown. FIG. 1(F) is a plan view showing the signal side FPCIOa, FIG. 1(CG) is a plan view showing the scanning side FPCIOb, and FIG. 1(I4) is a plan view showing the signal side FPC 10c.

In this embodiment, F, which is the inductive wiring section of the liquid crystal display panel 5,
As shown in FIG. 1 (F), (G), and (H), the PC
Three FPCs that are independent and separate parts]. O a, 1
0b. It consists of loc. Each FPC 10
A to 10c are provided with an input terminal (not shown) and an output terminal 15, and a chip component 8 is mounted thereon. The terminals shown with broken lines in (F) and (H) indicate that the terminal surface is on the back side. In addition, each FPC is provided with a hole 16, and a pin 17 (see Fig. 1 (A)) provided integrally with the lower shield case 2 is inserted into the hole 16 to allow the FPC to open.
A PC is held in a lower shield case 2. 26 is a connection part for connecting FPC comrades,
More details later.

FIG. 1(I) is a sectional view of the FPC. 21 is a base film made of polyimide or the like and having a thickness of, for example, 25 μm;
22 is a cover film made of polyimide or the like with a layer thickness of 25 μm; 23 is a certain conductor made of rolled hollow foil with a layer thickness of 35 μm;
4 is a thermosetting adhesive layer having a layer thickness of 20 to 25 μm.

In this way, the FPC is composed of three polyimide layers, and the connection parts 26 (FIG. 1 (F) to (H)) between the FPCs are
) is composed of one polyimide layer, that is, a base film 21.

Figure 1 (J) shows the FPCIO a to lo divided into three parts.
c is an enlarged partial plan view showing a connecting part 26 having terminals for connecting two parts. Reference numeral 26 indicates a connecting portion between the FPCs 10a to 1oc, 27 indicates a terminal for connecting the FPCs 10a to 10c, and 28 indicates a plurality of dummy terminals provided on both sides of the terminal 27.

The dummy terminal 28 is not normally used. In other words, it is a terminal from which the display circuit is electrically disconnected, and it is an electrically floating terminal.

The connecting portion 26 is made of only one layer, that is, the single-layer film 21 (FIG. 1 CI), and is flexible.

In the liquid crystal display device of this embodiment, the drive wiring portion of the liquid crystal display panel 5 is made of FPCIOa made of an elastic material such as polyimide.
~10c, so the LCD panel 5 and F
The stress generated in the long axis direction of the FPC due to the difference in expansion rate of the PC is absorbed by the bending of the flexible PFCs 10a to 10c, preventing the input side outer lead 14, which has the weakest strength of the TAB 9, from being cut. Therefore, the reliability of the liquid crystal display device against heat can be improved. In addition, as liquid crystal display screens become larger, as the size of the liquid crystal display device increases, the drive wiring section including the TAB becomes heavier, but FPCs are lighter than conventional PCBs. The moving wiring section can be made lighter, the load on the input side outer lead 14 of the TAB 9 can be reduced, and reliability against vibrations and shocks can be improved.

Furthermore, the weight of the entire liquid crystal display device can be reduced.

In addition, TAB9 of FPC 10a to 10c
A reinforcing plate 25 is provided at the connection part of the chip component 8 and the mounting part of the chip component 8. Since the FPC is reinforced from the back, connection of the TAB 9 and mounting of the chip component 8 can be performed stably and easily, resulting in good workability. Note that the reinforcing plate 25 is the FPC 10a.
Flexible FP as it is divided in the long axis direction of ~10c
The stress is effectively absorbed by the deflection of C10a to loc.

Furthermore, as shown in FIG. 1 (J), a connecting FPC for connecting divided PCBs as in the prior art is used.
, and other connecting parts can be omitted, and the number of connecting steps can be reduced by half. Further, since the connecting portion 26 is made up of only a layer and is highly flexible, it is easy to connect the FPCs 10a to 10c and can absorb stress. Also, dummy terminal 28
By providing this, it is possible to increase the number of terminals to be soldered at the connection portion between FPCs, thereby increasing the connection strength. In this way, this embodiment can improve the reliability of the connection between the two. Note that connecting the dummy terminal 28 to a DC power supply wiring (AC grounding point) such as a ground wiring is effective as a countermeasure against noise.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As explained above, according to the liquid crystal display device of the present invention,
Since the active wiring part of the liquid crystal display panel is made of an elastic material, stress caused by the difference in expansion coefficient between the liquid crystal display panel and the active wiring part can be alleviated, improving the reliability of the liquid crystal display against heat, and making it possible to Since a reinforcing plate was installed on the board,
The workability of connecting the TAB to the wiring board and mounting chip components can be improved.

[Brief explanation of drawings]

FIG. 1(A) is a plan view showing the internal structure of an embodiment of the liquid crystal display device of the present invention, and FIG. 1(B) is a plan view showing the external appearance of the liquid crystal display device of the present embodiment. Figure (C) is a front view of Figure 1 (B), Figure 1 (D) is a side view of Figure 1 (B), and Figure 1 (E) is a liquid crystal display panel/TAB female movement. I
Diagrams showing each connection state of C-FPC, Fig. 1 (F), (G
), (H) are the plan views of each FPC, and Figure 1 (I) is the FPC.
FIG. 1 (J) is a cross-sectional view of the PC; FIG. 1 (J) is a plan view showing the connection part of the FPC; FIG. A plan view, FIG. 3 is a cross-sectional view taken along the line nn in FIG. is a plan view of the main part depicting only the pixel electrode and color filter layer shown in FIG. 4, and FIG.
FIG. 3 is an equivalent circuit diagram of the liquid crystal display section of this embodiment. l... Upper shield case 2... Lower shield case 3... Upper shield case liquid crystal display window 4... Lower shield case liquid crystal display window 5... Liquid crystal display panel ps... Power supply circuit CNV ...CRT-}TPT conversion circuit 6...Connector section 7...Heel motion IC 8...Chip component 9...TAB 10a, 10b, 10c - F P C1
1...PCB 12...Manual terminal of liquid crystal display panel 13...Output side outer lead of TAB 14...TA
Input side outer tray of B 5...FPC output terminal 16...hole 17...pin SUB↓...lower transparent glass substrate SUB2...upper transparent glass substrate LC...liquid crystal SL...seal Material ■8... Electrode 19 of mobile IC... Inner lead 20 of TAB... Anisotropic conductive film 21... Base film 22... Cover film 23... Conductor 24... Adhesion Agent layer 25...Reinforcement plate 26...FPC connection part 27...FPC terminal 28...Dummy terminal

Claims (1)

[Claims] 1. A liquid crystal display panel, a plurality of TABs electrically connected to the liquid crystal display panel and mounting a driving IC for driving the liquid crystal display panel, and electrically connected to the plurality of TABs. and a wiring board on which the plurality of TABs are mounted, the wiring board being made of an elastic member, and a plurality of first reinforcing plates being arranged at the connecting portions of the plurality of TABs on the wiring board. A liquid crystal display device featuring: 2. The liquid crystal display device according to claim 1, wherein a chip component is further mounted on the wiring board, and a second reinforcing plate is disposed on a mounting portion of the wiring board for the chip component.