JP2001222237A - Display device and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make connection of a PCB with a jumper FPC easily and with high accuracy. SOLUTION: The manufacturing method passes through each process of (1)-(4) sequentially. (1) To insert a common PCB positioning pin 16 of a jig 13 for positioning in a common PCB positioning hole 19, and to place a common PCB 7 to the prescribed position with a narrow pitch terminal group 11. (2) To insert jumper FPC positioning pins 17 and 18 of the jig 13 for positioning in jumper FPC positioning holes 20 and 21, and to place the jumper FPC 8 to the prescribed position between a segment PCB 6 and the common PCB 7. (3) To connect the narrow pitch terminal group 9 of the jumper FPC 8, and the narrow pitch terminal block 11 of the common PCB 7 with the solder. (4) To connect the wide pitch terminal block 10 of the jumper FPC 8, and the wide pitch terminal block 12 of the segment PCB 6 with the solder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board provided on a segment side and a common side of a substrate made of glass or the like, and a jumper FPC (Flexibl
The present invention relates to a display device such as a liquid crystal display device and an EL device connected by an e Print Circuit) and a method of manufacturing the same.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, in the case of a single scan driving type STN (Super Twist Nematic) liquid crystal display device, one circuit board (hereinafter abbreviated as PCB) is provided on a segment side and a common side is provided on a common side. Also one pcb
These PCBs are TAB (Tape Automated Bondin)
g) is connected and fixed to the liquid crystal panel. Further, the electrical connection between both PCBs is made through a jumper FPC by soldering. This jumper FPC
Generally paste rolled copper foil on a polyimide substrate,
This rolled copper foil is patterned.

Also, a dual scan drive type STN
In a liquid crystal display device, two segment PCBs are provided, and the segment PCB and the common PCB are similarly connected by a jumper FP.
Electrical connection is made via C.

These PCBs are obtained by patterning electric circuit wiring on a substrate made of glass-epoxy resin and laminating a plurality of these substrates, and are usually obtained by punching with a mold to form a predetermined shape. .

To manufacture a liquid crystal display device having the above structure,
First, a TAB is connected to the liquid crystal panel, a segment PCB and a common PCB are connected and fixed to the TAB, and then a jumper FPC is connected and fixed. Before proceeding with such work, a segment PCB or common PC
A solder land for a TAB input terminal and a solder land for a jumper FPC connection terminal are formed on B, and the position between the input terminal on the TAB and the solder land for the TAB input terminal on the PCB is accurately positioned. After soldering,
Jumper FP for segment PCB and common PCB
C is connected by soldering.

[0006]

However, in a liquid crystal display device in which segment PCBs and common PCBs are arranged side by side, the structure is such that the PCBs are arranged on the liquid crystal panel. Although it is necessary, the production cost must be reduced by arranging it more efficiently, but sufficient research and development has not yet been conducted to solve these problems. For this reason, it has been desired to reduce the production cost with high arrangement accuracy and high efficiency.

For example, in the above-described manufacturing method, connection between the PCB and the jumper FPC cannot be performed with high accuracy.

[0008] That is, the PCB is processed into a predetermined shape by punching with a mold, but on the punched end surface, burrs due to drawing out of glass fiber (PULL OUT phenomenon) and rupture after plastic deformation of the resin. The processing accuracy is inferior due to many occurrences, and furthermore, since the PCB has a multilayer structure made of plastics, there is a warp, and the amount of warpage is not constant. However, the positioning cannot be performed accurately, and the connection between the PCB and the jumper FPC cannot be performed accurately.

Further, in the liquid crystal display device having the above-described PCBs arranged side by side, there are liquid crystal panels of various dimensions, and a PCB (for example, a segment PCB) having dimensions set corresponding to each size must be prepared. And the number of types increased, and the development cost and development process became enormous. Further, even with liquid crystal panels of the same display size, PCBs of various sizes may be attached in accordance with the diversification of PCBs. In practice, preparing PCBs of various dimensions has increased costs.

Accordingly, the present invention has been completed in view of the above circumstances, and a purpose of the present invention is to provide a display in which the connection between the PCB and the jumper FPC can be easily and accurately performed even when using a PCB having poor processing accuracy. An object of the present invention is to provide a method for manufacturing a device.

Another object of the present invention is to provide a display device which can easily produce a PCB which can accommodate display units of various sizes, thereby reducing the production cost.

[0012]

[Means for Solving the Problems] The display device of the present invention comprises:
Liquid crystal, a long circuit board is arranged side by side along one end of a rectangular substrate having a display unit such as EL, and one end of the substrate and the circuit board are electrically connected via TAB,
The long circuit board is characterized in that units on which a predetermined wiring pattern is formed are linearly arranged, and the units can be cut off.

The method for manufacturing a display device according to the present invention comprises the steps of:
In a rectangular substrate having a display section such as L, one circuit board and the other circuit board are arranged side by side along one side edge and the other side edge orthogonal to each other, and one side edge of the board and one circuit board Are connected via TAB, and the other end of the board and the other circuit board are connected via the other TAB. For a display device, a jumper FPC having a narrow pitch terminal group and a wide pitch terminal group is used as follows. By sequentially passing through the steps (1) to (4), each terminal group of the one circuit board and the other circuit board is energized.

(1) One circuit board having a narrow pitch terminal group is arranged at a predetermined position using a positioning jig.

(2) The jumper FPC is arranged at a predetermined position between the one circuit board and the other circuit board by using a positioning jig.

(3) The narrow pitch terminal group of the jumper FPC is connected to the narrow pitch terminal group of the one circuit board.

(4) The wide pitch terminal group of the jumper FPC is connected to the wide pitch terminal group of the other circuit board.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Method of Manufacturing Display Device of the Present Invention)
Hereinafter, a manufacturing method for easily and accurately manufacturing the display device of the present invention will be described in detail with reference to FIGS.

FIG. 1 is an exploded perspective view of the liquid crystal display device 1, and FIG.
FIG. 2 is a plan view of a main part of FIG. 1.

Reference numeral 2 denotes a common-side substrate made of a glass substrate;
Is a segment-side substrate made of a glass substrate, both of which are arranged to face each other via a sealant made of a thermosetting resin such as an epoxy-based, acrylic-based, or silicone-based resin. ITO transparent electrodes are formed on the inner surface, and an alignment film of a polyimide resin is provided on these transparent electrodes, and liquid crystal is sealed inside.

Reference numeral 4 denotes a segment TAB arranged at the end of the segment-side substrate 3, reference numeral 5 denotes a common TAB arranged at the other end of the segment-side substrate 3, reference numeral 6 denotes a segment PCB, and reference numeral 7 denotes a common PCB. .

A step of connecting the jumper FPC 8 to the liquid crystal display device 1 having the above-described configuration using the positioning jig 13 will be described. In this step, steps (1) to (4) are sequentially performed. The jumper FPC 8 includes a narrow pitch terminal group 9 and a wide pitch terminal group 10, and the narrow pitch terminal group 9 is a common PC.
B7 is connected to the narrow pitch terminal group 11, and the wide pitch terminal group 10 is connected to the wide pitch terminal group 12 of the segment PCB6.

The positioning jig 13 is a liquid crystal cell stage 1.
The liquid crystal cell (segment side substrate 3) is mounted on the liquid crystal cell stage 14, and the common PCB 7 is mounted on the PCB set jig 15. Is done. Furthermore, PCB set jig 15
Has common PCB positioning pin 16 and jumper FPC
Positioning pins 17 and 18 are provided, and holes into which these pins are inserted are common PCB positioning holes 19 and 18, respectively.
The jumpers are formed as FPC positioning holes 20 and 21.

Next, each of the steps (1) to (4) will be described. (1) By inserting the common PCB positioning pins 16 provided on the positioning jig 13 into the common PCB positioning holes 19, the common PCB 7 is arranged at a predetermined position together with the narrow pitch terminal group 11. (2) The jumper FPC positioning pins 17 and 18 provided on the positioning jig 13 are connected to the jumper FPC positioning holes 2.
By inserting the jumpers FPC8 into the segment PCB6 and the common PCB7 by inserting the jumpers FPC8 into the common PCB7. (3) The narrow pitch terminal group 9 of the jumper FPC 8 and the narrow pitch terminal group 11 of the common PCB 7 are connected by soldering. (4) The wide pitch terminal group 10 of the jumper FPC 8 and the wide pitch terminal group 12 of the segment PCB 6 are connected by soldering.

Thus, according to the manufacturing method of the present invention, the positional relationship between the jumper FPC 8 and the common PCB 7 is first set using the positioning jig 13, and then the narrow pitch terminal group 9 of the jumper FPC 8 and the narrow position of the common PCB 7 are narrowed. By going through the step of connecting the pitch terminal group 11, there is no need to position the connection between the other jumper FPC 8 and the segment PCB 6, and the connection can be made easily.

In the above embodiment, the jumper F
The pitches of the narrow pitch terminal group 9 of the PC 8 and the narrow pitch terminal group 11 of the common PCB 7 are aligned, and the jumper FP
The pitches of both the wide pitch terminal group 10 of C8 and the wide pitch terminal group 12 of the segment PCB 6 are aligned, but the pitch P1 of the narrow pitch terminal group 9 (narrow pitch terminal group 11) and the wide pitch terminal group 10 (wide pitch) Pitch P of pitch terminal group 12)
It is preferable that the relationship with P2 be P2−P1 ≧ (１ ／) × P1.

As for the terminal width of each pitch terminal group, the narrow pitch terminal group 9 and the wide pitch terminal group 10 of the jumper FPC 8 and the narrow pitch terminal group 11 of the common PCB 7 are all substantially the same width (W1). However, compared to this width (W1), the wide pitch terminal group 1 of the segment PCB6
It is preferable to increase the width (W2) of No. 2 so that the position can be easily set without using a positioning jig. Desirably, (W2) ≧ 2 × (W1). Further, for example, P1 is 0.5 to 0.8 mm
The degree is good, and W1 is の of P1 as a design guide, but is preferably 0.3 mm or more in consideration of strength.

It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements may be made without departing from the spirit of the present invention. For example, in the above embodiment, the narrow pitch terminal group is formed on the common PCB, and the wide pitch terminal group is formed on the segment PCB.
A wide pitch terminal group may be formed in this case. In this case, a positioning jig is provided with a segment PCB positioning pin,
A positioning hole provided in the segment PCB may be inserted into this. Further, in the above embodiment, two jumpers F
Although a PC is used, a jumper FPC may be similarly provided on the back side of each PC, so that four jumpers FPC may be used for fixed connection. In this example, the liquid crystal display device has been described. However, other display devices such as an EL device have the same effect. (Display Device of the Present Invention) Next, the display device of the present invention will be described in detail with reference to FIGS. As the display device, there are various display configurations such as a liquid crystal display device and an EL device.

FIG. 3 is a plan view of the liquid crystal display device 22.
FIG. 4 is a plan view of the long circuit board 23.

The size of the display section 24 of the liquid crystal display device 22 is a VGA size (10.4 ″), and long circuit boards 23 are arranged along a rectangular display board 25 having the display section 24. The long circuit board 23 corresponds to the segment PCB or the common PCB.
Is a segment PCB, and 23b is a common PCB. In addition, segment PCB23a and common PCB23
b is electrically connected by a jumper-FPC 28.

Further, one end of the display board 25 and the long circuit board 23 are electrically connected and fixed via the TAB 26. A driver IC 27 is mounted on each TAB 26.

When the display substrate 25 is an STN type liquid crystal display substrate, the pattern interval between the electrodes is 0.33 mm. Accordingly, the input pattern 29 of the TAB 26 is also set to have the same interval. 33 mm. By adjusting the distance between the two, the TAB 26 is connected and fixed on the display substrate 25 via the anisotropic conductive adhesive.

On the other hand, the driver IC 27 is connected to the segment P
When mounting on CB23a, segment PCB2
Since the interval between the input wiring patterns 30 provided on 3a and the terminal interval between the driver ICs 27 are substantially the same,
The connection between them is fixed by soldering.

In the present invention, the segment PCB 23a, which is the long circuit board, is configured such that units on which a predetermined wiring pattern is formed are linearly arranged, and the units can be cut off. Hereinafter, this point is shown in FIG.
Will be described in detail.

According to the long circuit board 23 shown in FIG.
The same wiring pattern is formed for each unit, that is, for each IC block, and is configured to be cut between the units.
Is cut in accordance with the size of the display section 24.

For example, the display unit 24 of the liquid crystal display device 22
If the size is VGA size (10.4 "), IC
The number of blocks should be eight or more. In this case, a long circuit board 2 which can be applied to a large display section of XGA size.
By preparing 3 and cutting it at an appropriate site, the dimensions are adjusted to the VGA size.

In such a long circuit board 23 (segment PCB 23a), a repetitive wiring pattern is formed for each IC block, and a circuit function is retained for each IC block.
The circuit function is not lost even if the connection is cut between arbitrary IC blocks.

For example, the IC of the segment PCB 23a
The eighth long side end input pad 31 of the block may be exposed at a central portion thereof and cut by a substrate cutter such as a substrate router.

The long-side end input pad 31 has a conductor exposed on the surface layer of the circuit board and is, for example, tin-plated, so that the cut portion can be used as a longitudinal end without any special modification. Thus, it can be electrically connected to the common PCB 23b through the jumper-FPC 28.

When the size of the display section 24 of the liquid crystal display device 22 is the QVGA size (5.7 "),
Four or more C blocks are required, and the fourth long side end input pad 31 of the IC block is exposed and the central portion is cut by a substrate cutter such as a substrate router.

Thus, in the liquid crystal display device 22 having the above-described structure, a long circuit board 23 having a long dimension is prepared in advance, and the liquid crystal display device 22 can be applied to display units 24 of various sizes by cutting them accordingly. As a result, there is no longer a design corresponding to the segment PCB 23a as in the prior art, and there is no need to manufacture it. As a result, the development process and the number of parts can be reduced, and the cost can be reduced.

[0042]

As described above, according to the method of manufacturing a display device of the present invention, a jumper FPC having a narrow pitch terminal group and a wide pitch terminal group is used. Positioning can be performed with high accuracy by connecting the terminal group and the narrow pitch terminal group on one circuit board, and then the wide pitch terminal group of the jumper FPC and the wide pitch terminal group of the other circuit board without using a positioning mechanism. And can be easily connected,
Even if a PCB having poor processing accuracy is used, the connection between the PCB and the jumper FPC can be easily and accurately performed, and a highly reliable display device manufacturing method can be provided.

In the display device of the present invention, a long circuit board is juxtaposed along one end of a rectangular substrate having a display portion such as a liquid crystal display or an EL display, and one end of the substrate is connected to the circuit board. Are electrically connected to each other via TAB, and the long circuit board is configured such that units having a predetermined wiring pattern are linearly arranged and each unit can be cut off. The longitudinal dimension of the long circuit board can be set in accordance with various sizes of the display section, whereby the development process and the number of parts can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device according to the present invention.

FIG. 2 is a plan view of a main part of the liquid crystal display device according to the present invention.

FIG. 3 is a plan view of the liquid crystal display device according to the present invention.

FIG. 4 is a plan view of a long circuit board used in the liquid crystal display device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Common side board 3 Segment side board 4 Segment TAB 5 Common TAB 6 Segment PCB 7 Common PCB 8 Jumper FPC 9,11 Narrow pitch terminal group 10,12 Wide pitch terminal group 13 Positioning jig 16 Common PCB positioning Pin 17, 18 Jumper FPC positioning hole 19 Common PCB positioning hole 20, 21 Jumper FPC positioning hole 22 Liquid crystal display device 23 Long circuit board 23a Segment PCB 23b Common PCB 24 Display section 25 Display board 26 TAB 27 Driver IC 28 Jumbar FPC

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H092 GA40 GA46 GA50 GA51 NA25 PA06 5G435 AA00 AA14 AA17 BB05 BB12 EE33 EE37 EE40 EE41 EE42 EE43 KK03 KK05 KK10

Claims (2)

[Claims] 1. A long circuit board is juxtaposed along one end of a rectangular substrate having a display portion such as a liquid crystal or an EL, and one end of the substrate and the circuit board are electrically connected via a TAB. 2. The display device according to claim 1, wherein the long circuit board is configured such that units on which a predetermined wiring pattern is formed are linearly arranged, and the units can be cut off. 2. A rectangular circuit board having a display portion such as a liquid crystal display or an EL display, wherein one circuit board and the other circuit board are provided side by side along one side edge and the other side edge which are orthogonal to each other. One side end and one circuit board are connected via TAB, and the other side end of the board and the other circuit board are connected to the other TAB.
The display device connected through B is sequentially subjected to the following steps (1) to (4) by a jumper FPC having a narrow pitch terminal group and a wide pitch terminal group, so that one circuit board and the other circuit board are connected to each other. A method of manufacturing a display device, wherein each terminal group is energized. (1) A circuit board having a narrow pitch terminal group is arranged at a predetermined position using a positioning jig. (2) The jumper FPC is arranged at a predetermined position between the one circuit board and the other circuit board by using a positioning jig. (3) The narrow pitch terminal group of the jumper FPC is connected to the narrow pitch terminal group of the one circuit board. (4) The wide pitch terminal group of the jumper FPC is connected to the wide pitch terminal group of the other circuit board.