JP2810571B2 - 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 device,
In particular, it relates to a connection structure between a liquid crystal panel and a printed circuit board.

[0002]

2. Description of the Related Art In general, development and mass production of liquid crystal display devices are being actively promoted mainly for color TVs. “Flat panel display 1991” issued by Nikkei BP is a detailed explanation of these technical trends. For example, 181-P. By 188, drive LS
The mounting technique of I is described in detail.

At present, TAB (Tape Automat)
The ed bonding) mounting method has become the mainstream of driving circuit IC mounting. That is, a bump having a height of about 20 μm is formed on the electrode portion of the driving LSI chip, a Cu pattern or the like is separately formed on a film such as polyimide, and Au or Sn is formed.
Etc. to form a carrier tape. The bumps of the above-described driving LSI chip are connected together by thermocompression bonding. Then, the drive LSI chip is sealed with a resin, a non-defective test product is cut off from the carrier tape, and this is connected to an electrode on the liquid crystal panel via an anisotropic conductive resin.

FIGS. 1 and 2 show the configuration of the present invention, but since they include a conventional structure, they will be described here with reference to FIGS. 1 and 2. FIG. In FIG. 1, three TABs connected to the glass substrate (18) and the other end are not connected are shown in FIG.
(11), (12), (13), and in FIG. 2, the TAB (1) provided on three sides without the connector (23).
As shown in (1), (12) and (13), the liquid crystal panel (1)
TAB connected to the upper terminal part is a spacer (1).
It was bent and connected so as to cover the side end face of 7) and the side end face of the printed circuit board (16).

For example, in an active matrix type liquid crystal display device using a TFT, TAB (11), (1)
3) are electrically connected to alternately derived drain lines (data lines), TAB (12) is electrically connected to gate lines (address lines) connected in only one direction, and TAB (14) ) Was not provided.

[0006]

In recent years, with the improvement of technologies such as high-definition television, the cell size has become small and large numbers of devices can be manufactured. Therefore, it has been necessary to alternately derive the above-mentioned gate lines similarly to the drain lines. That is, it is necessary to provide TABs on the four sides of the liquid crystal panel. However, as described above, when the TAB is provided so as to cover the side end surface of the spacer and the side end surface of the printed circuit board, the side end provided with the connector has a problem that the connector is in the way.

[0007] COG (chip on glass)
s) Even if a driving LSI chip or the like is directly mounted on a glass substrate of a liquid crystal panel as in the mounting structure, since a thin film is used as a wiring, there is a problem that a resistance and a parasitic capacitance are generated and operating characteristics are deteriorated. Therefore, in order to prevent the deterioration of the operation characteristics, it is necessary to form a problematic circuit on a printed circuit board. Therefore, when it is necessary to provide a flexible substrate on the four sides of the liquid crystal panel, there is a problem that the connector becomes an obstacle similarly to the above-described TAB.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first means is that a liquid crystal is injected into a pair of transparent insulating substrates (18) and (19). A panel (10), a printed board (16) disposed above the liquid crystal panel (10) and having a circuit necessary for driving the liquid crystal panel on at least one surface, and a printed board (16). A connector (23) electrically connected to a conductive path provided on one side and disposed on the liquid crystal panel surface facing the printed circuit board (16) or on the rear surface of the surface near the one side; a plurality of terminals provided which are electrically connected to one end (14 _a)), the liquid crystal panel (10) and a plurality of terminals arranged on the near one side of the printed circuit board surface opposite electrical the other end connected to the (14 _B) A flexible substrate having (14)
The problem is solved by having the following.

As a second means, a liquid crystal is injected into a pair of transparent insulating substrates (18) and (19), and is electrically connected to a conductive path extending from a region where the liquid crystal is injected. Liquid crystal panel (10) provided with four terminals on four sides
A printed circuit board (16) which is larger than the outer shape of the liquid crystal panel (10) and is located above the liquid crystal panel (10), and has a circuit necessary for driving the liquid crystal panel on at least one surface; The liquid crystal panel (10)
A connector (23) disposed on the back surface of the printed circuit board (16) opposite to the printed circuit board and electrically connected to a conductive path provided near one side of this surface; opposing the liquid crystal panel (10) plane or a plurality of terminals electrically connected to one end provided on the other side near the rear surface of the face and _{(11 a), (12 a} ), (1
3 _A) and the liquid crystal panel (10) electrically connected to a plurality of terminals (25 provided on the other side near the back surface of the printed circuit board (16) surface facing) and is other end (11
_B ), ( _12B ), ( _13B ), a first flexible substrate (11), (12), (13), and a surface of the liquid crystal panel (10) facing the printed circuit board (16) or a plurality of terminals electrically connected to one end provided in the vicinity of one side of the back surface of the surface (14 _a), the liquid crystal panel (10) and facing the printed circuit board (16) wherein the flush The problem is solved by having a second flexible substrate (14) having a plurality of terminals provided in the vicinity of the side and the other end (14 _B ) electrically connected thereto.

[0010] Further, as a third means, liquid crystal is injected into a pair of glass substrates (18) and (19), and one glass substrate (18) is formed larger than the other glass substrate (19). A liquid crystal panel () provided with terminals electrically connected to lines extending from the display area is provided on four sides of one glass substrate (18) outside the outer shape of the glass substrate (19). 10), a region corresponding to a display region of the liquid crystal panel (10) is hollowed out, and a spacer (17) made of an insulating material disposed above the liquid crystal panel (10); A printed circuit board (16) provided with a circuit necessary for operating the liquid crystal panel (10); ) And conductive path electrically connected to and arranged connectors provided on one side of (23),
One end (11 _A ) electrically connected to a plurality of terminals provided near the other side of the liquid crystal panel (10) surface or the back surface of the liquid crystal panel (10) facing the printed circuit board (16);
(12 _A), and (13 _A), it extends over the side end surface of the spacer corresponding from one end to the other side (17) and the printed board (16), opposed to the liquid crystal panel (10) said plurality of terminals (25) provided on the other side near the rear surface of the printed board (16) surface and electrically connected to the other end _{(11 B), (12 B} ), terminates in (13 _B) First flexible substrates (11), (12), (13)
And one end (14) electrically connected to a plurality of terminals provided in the vicinity of the one side of the surface of the liquid crystal panel (10) facing the printed circuit board (16) or the back surface of the surface.
_A ) and extending from one end thereof to cover the side end surface of the spacer (17) corresponding to the one side, and provided near the one side of the printed circuit board surface facing the liquid crystal panel (10). Second flexible substrate (14) terminated at the other end (14 _B ) electrically connected to the plurality of connected terminals
The problem is solved by having the following.

[0011]

In the first means, the flexible substrate (1)
Since the other end (14 _B ) of 4) is bent and connected to the printed circuit board surface (16) facing the liquid crystal panel (10), the surface opposite to the printed circuit board surface (16) has a space. That is, wiring can be provided on this surface to connect the connector (23). Therefore, a TA in which the driving LSI chip (15) is connected to a liquid crystal panel or printed circuit board corresponding to the side where the connector (23) is provided.
B (14) can be provided. Further, a flexible substrate can be provided on a liquid crystal panel having a COG mounting structure.

In the second means, the liquid crystal panel (10)
When terminals are provided on the four sides, for example, address lines
When the and the data line are alternately extended to opposite sides,
Only the side where the connector (23) is provided is flexible
(14) _B) Is the liquid crystal panel (1
0) and the printed circuit board (16)
Space on the opposite side of the printed circuit board
The connector on the wiring on this side (23)
Can be connected. Also, as shown in FIG.
(23) is mounted on the back side of the printed circuit board (16)
So the connector (23) is a flexible board (14)
There is no hindrance to implementation work. The connector (2
Flexible substrate provided on the side where 3) is not provided
(11), (12), (13))_B),
(12_B), (13)_B) Is the liquid crystal panel (1) as before.
0) and the printed circuit board (16) are laminated and soldered
And the like can be used to achieve electrical connection.

In the third means, the flexible substrate (14) provided on the side where the connector (23) is installed
Because of the presence of the spacer (17), it is possible to prevent contact between one flexible substrate and the other flexible substrate that are folded and overlap.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below. In the present application, TAB (11), (1
2), (13), (14) and a flexible substrate can be mounted. That is, as shown in FIG.
Whether the chip (15) is mounted in a TAB package bonded to a flexible substrate or the COG structure in which a driving LSI chip is mounted on a glass substrate of a liquid crystal panel, it is very effective when connection means are required in four directions. It is.

In FIG. 1, a liquid crystal panel (10) and a printed board (16) are provided.
7) is provided. In particular, if the surface of the TAB or the printed circuit board is insulated, the spacer (17) is not necessary. The liquid crystal panel (10) shown in FIG.
Insulating substrate (18) and a transparent second insulating substrate (1)
9) are opposed to each other.

The liquid crystal panel may be either a simple matrix type or an active matrix type, but hereinafter, an active matrix type using a TFT will be described. First, the transparent first insulating substrate (18) is, for example, a glass substrate. On this glass substrate (18), C
The gate and the auxiliary capacitance electrode are provided by laminating 500% of r and 1500% of Cu containing 1% of Fe.
A plurality of gate lines integral with the gate and a plurality of auxiliary capacitance lines integral with the auxiliary capacitance electrode are provided in parallel.

Subsequently, an insulating layer such as a silicon nitride film SiNx is provided on the entire surface, and an amorphous silicon film and an N ⁺ type amorphous silicon film are laminated on a region corresponding to the TFT on the SiNx film. I have. This N
^{Since the +} type amorphous silicon film is provided in the source and drain regions, the channel region is removed.

Further, a drain electrode is provided on an upper layer of the N ⁺ type amorphous silicon film corresponding to the drain region, and a drain line integral with the drain electrode extends in a direction intersecting the gate line. I have. A source electrode is provided on the N ⁺ -type amorphous silicon film corresponding to the source region, and a display electrode electrically connected to the source electrode is surrounded by a drain line and a gate line. And an alignment film is provided on the entire upper layer.

The first insulating substrate (18) has a larger outer shape than the opposing second insulating substrate (19). For example, drain lines are alternately provided on one pair of opposing sides. It is extended, and a terminal is formed at an end.
Gate lines extend alternately on the other pair of opposing sides, and terminals are formed at the ends. Next, there is a transparent second insulating substrate (19). This board has
A light-shielding film made of Cr is provided in a portion excluding the display region, a counter electrode for performing liquid crystal display with the display electrode is provided, and an alignment film is further provided.

Further, the adhesive is applied to the substrates (18) and (19).
Are bonded to each other at a fixed interval via a spacer, and a liquid crystal is injected therein. Here, the area indicated by the dotted line is the area into which the liquid crystal is injected. When the COG structure is adopted, an element such as a driving LSI chip may be face-down around the large first insulating substrate, or the first insulating substrate may substantially cover the display area. The size of the second
The above-mentioned line may be extended through a conductive spacer or an anisotropic conductive resin, and an element such as a driving LSI chip may be face-down in this region. Further, instead of COG, an element may be formed directly on the large-sized glass substrate by utilizing semiconductor technology. In particular, when COG mounting or a semiconductor element is formed on the second insulating substrate, heat is not applied to the first insulating substrate, so that a characteristic deterioration of the TFT formed on the first insulating substrate can be prevented. Having.

Subsequently, the printed circuit board (16) is made of, for example, a glass epoxy resin, and a circuit pattern is formed on at least one of them. In the present application, a through hole is formed in this substrate, and a circuit pattern is provided on both surfaces,
A resin-molded semiconductor chip, a resistance element, and the like are fixed by soldering or the like. Also this printed circuit board (16)
Is hollowed out in the center to be used for a liquid crystal projector. This hollow portion (20) is formed to be the same as or slightly larger than the display area surrounded by the dotted line shown on the liquid crystal panel. Further, a hollow portion (22) is provided in which a protruding portion (21) on a cylinder provided on the spacer is fitted for positioning and fixing with a spacer (17) described later. In FIG. 1, a connector (23) is provided on the back side of the area to which the TAB (14) is connected.
When 6) is folded back via the TAB (14), the state where the connector (23) is fixed can be seen as shown in the upper right of FIG. Therefore, the printed circuit board (16)
Has a region (24) where the connector (23) is arranged protruding in a tongue shape in the upper right direction. As shown in FIG. 2, folded TABs (11), (12), and (13) are provided on three sides where the connector (23) is not provided.
In order to connect these terminals, terminals are provided, and are fixed by soldering or anisotropic conductive resin. Further, a terminal is naturally provided also in a portion where the TAB (14) is fixed in FIG. 1, and is electrically connected in the same manner as described above.

The spacer (17) is made of an insulating material.
A hollow part (27) is provided to prevent contact with the IC chip (26) and other elements mounted on 6). Further, similarly to the above-described printed circuit board (16), a region corresponding to the display region is hollowed out and the periphery protrudes. The projections (28) in the periphery coincide with or slightly protrude from the printed circuit board surface when assembled as shown in FIG.

Further, as shown in FIG. 1, two TABs (11), (12) and (13) are provided on each side. This number is not limited to this number, and may be one for each side, or three or more may be provided for each side. This T
A drive LSI chip (15) is face-down bonded to AB, and a hollow part (29) is provided so that bending can be easily performed.

As described above, when a transistor or a circuit is formed by COG mounting or a semiconductor substrate directly on a glass substrate by using a semiconductor technology, it is needless to say that a TAB is not required, and that only a wiring is provided on a flexible substrate. May be used.
The components of the configuration of the present invention have been described above. Needless to say, a shield case or the like is necessary if necessary.

Finally, the combination structure will be described. First T
AB (11), (12) , (13), one end of _{(14) (11 A),} (12 A), (13 A), (14 A) is
It is electrically connected to terminals provided on four sides of the liquid crystal panel. This connection portion is connected to the first insulating substrate (1).
Needless to say, the back surface of 8) may be connected to one surface of the second insulating substrate (19). Also TAB
(14) the other end of the (14 _B) is provided with terminals electrically connected to the surface (the liquid crystal panel which faces in FIG. 2) of the printed circuit board.

On the liquid crystal panel to which the TAB is fixed, a spacer (17) is fitted as shown by a small arrow, and on this spacer, as shown by a large arrow, a printed circuit board (17) is mounted. 16) is folded back so that the protruding portion (28) of the spacer fits into the hollow portion (20) of the printed circuit board. FIG. 2 shows a structure showing this state, and TAB (11), (12), and (13).
( _11B ), ( _12B ), and ( _13B ) are electrically connected to a terminal group provided on the printed circuit board.

Therefore, TAB (11), (12), (1)
3) is folded back so as to cover the spacer (17) and the side end surface of the printed circuit board (16). TAB (1
4) is folded back so as to cover only the side end surface of the spacer (17), so that in the perspective view of FIG.
It is hidden by the printed circuit board before 3) and cannot be seen. As is clear from FIG. 2, the other end (14 _B ) of the TAB (14) is
Since the connector (23) is fixed to the surface facing the liquid crystal panel and folded back, the connector (23) can be arranged without obstruction.
This connector (23) may be fixed to the back side contrary to the drawing, but as apparent from FIG.
It is not preferable because it becomes an obstacle when mounting (14).

[0028]

As is clear from the above description, by achieving the structure described in this embodiment, the flexible substrate and TAB can be provided in four directions in a simple matrix or active matrix liquid crystal panel. The liquid crystal module can be minimized because it is electrically connected by a very thin connecting means having flexibility. Therefore, since the connection means is provided in four directions, miniaturization and high pixel count accompanying high definition can be realized.

Further, even when a driving IC is formed around a COG mounting structure or a glass substrate, the connection means can be achieved in four directions, so that a circuit formed on a further printed substrate or a glass substrate can be applied to various types. Circuit can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connection structure of a liquid crystal display device of the present invention.

FIG. 2 is a perspective view when the components of FIG. 1 are assembled.

[Explanation of symbols]

 (10) Liquid crystal panel (11) TAB (12) TAB (13) TAB (14) TAB (15) LSI chip (16) Printed circuit board (17) Spacer (18) First insulating substrate (19) Second Insulating board (23) Connector

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1345 G02F 1/1333 G09F 9/00-9/46

Claims (3)

(57) [Claims] 1. A liquid crystal panel in which liquid crystal is injected into a pair of transparent insulating substrates, and a print disposed above the liquid crystal panel and having at least one surface with a circuit necessary for driving the liquid crystal panel. substrate and connected conductive path in electrical that provided on one side of the printed circuit board this
A connector disposed on the back surface of the printed circuit board facing the liquid crystal panel; and a plurality of terminals provided in the vicinity of the one side of the liquid crystal panel surface facing the printed circuit board. A flexible substrate having one end connected to the liquid crystal panel and the other end electrically connected to a plurality of terminals provided near the one side of the printed circuit board surface facing the liquid crystal panel. Liquid crystal display device. 2. A liquid crystal panel in which liquid crystal is injected into a pair of transparent insulating substrates, and terminals electrically connected to conductive paths extending from a region into which the liquid crystal is injected are provided on four sides. A printed circuit board which is larger than the outer shape of the liquid crystal panel and is disposed above the liquid crystal panel, and has a circuit necessary for driving the liquid crystal panel on at least one surface thereof, and the printed circuit board facing the liquid crystal panel A connector disposed on the back surface of the surface, the connector being electrically connected to a conductive path provided near one side of the surface, and the liquid crystal panel surface facing the printed board or the other side of the back surface of the surface. One end electrically connected to the plurality of terminals provided near the side, and electrically connected to the plurality of terminals provided near the other side of the back surface of the printed circuit board surface facing the liquid crystal panel. Was A first flexible substrate having the other end, and the liquid crystal panel surface facing the printed circuit board
Said plurality of terminals electrically connected to one end provided near one side, the liquid crystal panel facing the plurality provided in the vicinity of one side of the printed circuit board surface terminals and electrically to A liquid crystal display device comprising: a second flexible substrate having the other end connected thereto. 3. A liquid crystal is injected into a pair of glass substrates, one of the glass substrates is formed to be larger than the other glass substrate, and four sides of one of the glass substrates outside the outer shape of the other glass substrate are provided. A liquid crystal panel provided with a terminal electrically connected to a line extending from the display area, and a region corresponding to the display area of the liquid crystal panel being hollowed out, and an insulating layer disposed above the liquid crystal panel. A spacer made of a material, a printed circuit board provided with a circuit necessary for operating the liquid crystal panel, and a region corresponding to a display region of the liquid crystal panel being hollowed out and arranged above the spacer, A connector electrically connected to a conductive path provided on one side and disposed on the liquid crystal panel surface facing the printed circuit board or near the other side of the back surface of the surface; One end electrically connected to the plurality of terminals provided on the printed circuit board, and the one end extending from the one end to cover the spacer corresponding to the other side and the end of the printed circuit board, and facing the liquid crystal panel. A first flexible board that terminates at the other end electrically connected to a plurality of terminals provided near the other side on the back side of the surface; and a front of the liquid crystal panel face facing the printed board. One end electrically connected to a plurality of terminals provided in the vicinity of one side, and extending from the one end to cover the end of the spacer corresponding to the one side, facing the liquid crystal panel. A liquid crystal display device comprising: a plurality of terminals provided in the vicinity of the one side of the printed circuit board surface; and a second flexible substrate electrically terminated at the other end.