JPH07255025A - Liquid crystal display module - Google Patents

Abstract

PURPOSE:To provide a liquid crystal display module which is small in size and low in cost by adding the circuit substrate function of COB to a part of a liquid crystal display panel and using it together with COB on which one- layered driver ICs are mounted. CONSTITUTION:This liquid crystal display module is provided with the chip on board 31 on which plural driver ICs 41 and 42 driving liquid crystal are mounted, the liquid crystal panel 1 which is arranged above the chip on board 31, a connector 21 having an anisotropic conductive member which has lower contact parts 24b-29b connected to connection terminals 33-38 of the chip on board 31 and upper contact parts 24a-29a connected to liquid crystal top surface connection terminals 5-10 of the liquid crystal display panel 1, and a jumper wire 12 which is connected to the prescrived connection terminal 5 provided on the reverse surface of the display liquid crystal glass top surface plate 2 of the liquid crystal panel 1; and the driver ICs 41 and 42 on the chip on board 31 are connected by using the jumper wire 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip on board (COB) having a liquid crystal display panel and a driver IC (driver integrated circuit) for driving liquid crystal. After that, the liquid crystal display panel and the circuit unit (COB) that drives the liquid crystal
Are collectively referred to as a liquid crystal display module.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of such a conventional liquid crystal display panel and a COB equipped with a driver IC for driving the liquid crystal. In this figure, a plurality of driver ICs 105 a and 105 b for driving liquid crystal are arranged on a glass epoxy substrate 101. These driver IC10
Since 5a and 105b require a large number of external leads, lead wires are usually derived and wired from the four sides of the driver ICs.

Therefore, these driver ICs 105
The electric connection between a and the IC 105b is one driver IC.
The conductor pattern 102a is connected to the conductor pattern 102a via the wire bonding wire 106a. The conductor pattern 102a is connected to the front surface conductor pattern 102c through the through hole 104a, the back surface conductor pattern 102b, and the through hole 104b again. The surface conductor pattern 102c is connected to another driver IC via the wire bonding wire 106b.
It is connected to 105b.

Further, the conductor patterns 102a and 102b are provided between the through holes 104a and 104b.
Independent conductor patterns 103a and 103b are arranged. FIG. 4 is a COB mounting plan view of a conventional liquid crystal display module. As shown in this figure, the terminals 111 and the conductor patterns 11 are formed on the surface of the glass epoxy substrate 110.
2 (front side) is arranged.

On the glass epoxy substrate 110, the first driver IC 114a and the second driver IC 11 are also provided.
4b is installed. The conductor pattern 112 (front side) and the first driver IC 114a are connected to each other, and the conductor pattern 112 (front side) and the second driver IC 114b are connected to each other by a bonding wire 115. The through holes 113 are connected to each other by the conductor pattern 116 (back side), and connect the signal lines of the first driver IC 114a and the second driver IC 114b. The signal lines and output lines of the IC are fixed, and the glass epoxy board 11
In order to connect to a fixed terminal on 0, and to connect the input terminal of the signal line of the IC, it is necessary to consider the optimum position and then use multilayer wiring using through holes.

[0006]

However, in the above-described conventional liquid crystal display module, (1) when the driver IC has two or more chips, it is mounted on a substrate whose shape is restricted for design reasons. In order to route the output signal, it is necessary to form the wiring into two layers in the COB. Therefore, the cost of COB increases.

(2) In the COB having two-layer wiring, it is necessary to form a through hole, reliability of the through hole, selection of a substrate material capable of forming the through hole, etc. are essential, and the substrate and the conductor are limited. Increases costs. There was such a problem. The present invention eliminates the above problems,
A CO with a circuit board function of COB added to a part of a liquid crystal display panel to mount a plurality of layered driver ICs.
An object of the present invention is to provide a liquid crystal display module which is used together with B and is small in size and inexpensive.

[0008]

In order to achieve the above object, the present invention provides a liquid crystal display module having a chip-on-board on which a plurality of driver ICs for driving liquid crystal are mounted, and above the chip-on-board. A liquid crystal display panel, a connector having an anisotropic conductive member in which a lower contact portion is connected to a connection terminal of the chip on board, and an upper contact portion is connected to a connection terminal of the liquid crystal display panel,
Jumper wirings are provided which are connected to predetermined connection terminals provided on the back surface of the display liquid crystal glass top plate of the liquid crystal display panel and connect between other predetermined connection terminals arranged in parallel on the same back surface. Is used to connect a plurality of driver ICs on the chip on board.

[0009]

According to the present invention, as described above, the circuit board function of COB is added to a part of the liquid crystal display panel in the liquid crystal display module. That is, a jumper wiring that is connected to a predetermined connection terminal provided on the back surface of the display liquid crystal glass top plate of the liquid crystal display panel and connects between other predetermined connection terminals arranged in parallel on the same back surface is provided. The wiring is used to connect the plurality of driver ICs on the chip on board.

Therefore, one layer of wiring to the driver IC of the COB is sufficient, and unlike the conventional case, there is no need to form a through hole, the structure can be simplified, and the reliability of connection can be improved. Moreover, since it is not necessary to form through holes, inexpensive substrate materials can be used. Also, wiring inside the liquid crystal display panel is easy. That is, it is possible to easily form a plurality of fine thin film jumper wirings at low cost.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a schematic exploded perspective view of a liquid crystal display module according to a first embodiment of the present invention, and FIG. 2 is a schematic exploded perspective view of the liquid crystal display module. As shown in these figures, the liquid crystal display panel 1 has a display liquid crystal glass upper surface plate 2 and a liquid crystal glass lower surface plate 4, and a liquid crystal display between the display liquid crystal glass upper surface plate 2 and the liquid crystal glass lower surface plate 4. Are sealed with the liquid crystal sealing adhesive 3.

In addition, the display liquid crystal glass upper plate 2 and the liquid crystal glass lower plate 4 are provided with conductors for performing liquid crystal display, that is, common lines and segment lines (not shown). Liquid crystal upper surface connection terminals 5 to 10 are arranged in parallel on the back surface of the face plate 2. Further, a jumper wiring 12 for connecting only terminals in the liquid crystal display panel is provided on the lower surface plate 4 of the liquid crystal glass. That is, between the liquid crystal upper surface connection terminal 5 and the first connection terminal 12a of the jumper wiring 12 (jumper pattern), the connection ball 11 having a conductive film formed on the surface, the liquid crystal upper surface connection terminal 9, and the second jumper wiring 12 are provided. A connection ball 13 having a conductive film formed on its surface is disposed between the connection terminals 12b.

Since the jumper wiring 12 is drawn outside the display area, it does not affect the display. The liquid crystal upper surface connection terminals 5 to 10 of the liquid crystal display panel are interposed by a connector 21 having an anisotropic conductive member 23b which is sandwiched between silicon rubbers 22 made of an insulating material and which is alternately layered with an insulating layer 23a. And is connected to the connection terminals 33 to 38 of the glass epoxy board 32 of the COB 31.

That is, in the connector 21, the contact point 24a and the contact point 24b, the contact point 25a and the contact point 25b, and the contact point 26a and the contact point 26 are provided by the anisotropic conductive member 23a.
b, the contact point 27a and the contact point 27b, the contact point 28a and the contact point 28b, the contact point 29a and the contact point 29b, and the like can be energized only in the vertical direction. The connection terminals 33 to 38 on the glass epoxy substrate 32 of the COB 31 are connected to the first driver IC 41 and the second driver IC 42 by the bonding wires 39 and 40. Here, although the six connection terminals of the glass epoxy board 32 are shown,
Only part of it is shown for clarity. That is, in practice, the lead terminals 41a are formed on the four sides of the first driver IC 41, and the lead terminals 41a are formed.
The bonding wires 39 are used to connect many connection terminals corresponding thereto.

Also, lead terminals 42a are formed on the four sides of the second driver IC 42, and the lead terminals 42a and many corresponding connection terminals are connected by bonding wires 40. There is. Therefore, the connection between the first driver IC 41 and the second driver IC 42 mounted on the COB 31 is as follows: connection terminal 33 → contact point 24b → contact point 24a → liquid crystal upper surface connection terminal 5 → connection ball 11 → internal liquid crystal jumper pattern 12 → connection ball 13 → liquid crystal upper surface connection terminal 9 → contact point 28a → contact point 2
8b → a circuit such as the connection terminal 37 of the second driver IC 42.

The layout of the terminals of the driver IC, the pattern of the liquid crystal, the layout of the liquid crystal upper surface connection terminals, etc. can be arbitrarily designed. As described above, the liquid crystal display panel 1
A jumper wiring 22 connected to a predetermined liquid crystal upper surface connecting terminal 5 provided on the back surface of the display liquid crystal glass upper surface plate 2 and connecting between other predetermined liquid crystal upper surface connecting terminals 9 arranged in parallel on the same back surface. , Using this jumper wiring 12,
Connection is made between the plurality of driver ICs mounted on the COB 31.

That is, in the past, two-layer wiring was provided on the COB 31 and the driver ICs were connected through the through holes. Instead, however, jumper wiring is provided on the liquid crystal display panel where the wiring pattern can be easily created. Are formed to add the circuit board function of COB.
Further, in this embodiment, the liquid crystal upper surface connection terminals 5 and 9 have an advantage that they can be connected to the jumper wirings 12 and used as wirings in the liquid crystal display panel.

FIG. 5 is a schematic exploded perspective view of a main part of a liquid crystal display module showing a second embodiment of the present invention. In this embodiment, as shown in FIG.
Is a display liquid crystal glass upper plate 52 and a liquid crystal glass lower plate 5.
4, the liquid crystal is sealed between the upper surface plate 52 and the lower surface plate 54 by the liquid crystal sealing adhesive 53.

The display liquid crystal glass upper plate 52 and the liquid crystal glass lower plate 54 are provided with conductors for performing liquid crystal display, that is, common lines and segment lines (not shown),
Further, the liquid crystal upper surface connection terminals 55 to 60 are arranged in parallel on the back surface of the display liquid crystal glass upper surface plate 52, and the liquid crystal upper surface connection terminal 55 is drawn outside the back surface of the display liquid crystal glass upper surface plate 52 and the liquid crystal. A jumper wiring 61 connected to the upper surface connection terminal 60 is provided. In other respects, the transistor has the same structure as the transistor of the first embodiment, and therefore, the same reference numerals are given and the description thereof is omitted.

Therefore, the connection between the first driver IC 41 and the second driver IC 42 mounted on the COB 31 is as follows.
Connection terminal 33 → contact point 24b → contact point 24a → liquid crystal upper surface connection terminal 55 → jumper wiring 61 → liquid crystal upper surface connection terminal 60 → contact point 29a → contact point 29b → second driver I
It is composed of a circuit like the connection terminal 38 of C42. With this configuration, a conductive film is formed on the surface, which is provided between the liquid crystal upper surface connection terminal 5 and the first connection terminal 12a of the jumper wiring 12 (jumper pattern) as shown in the first embodiment. Connection ball 11, second connection terminal 12b of liquid crystal upper surface connection terminal 9 and jumper wiring 12
The connection balls 13 and the like having a conductive film formed on the surface therebetween are not necessary, and there is an advantage that the connection wiring can be simplified.

As described above, according to the present invention, the wiring in the liquid crystal display panel can be easily miniaturized with a thin film.
It is easy to add a circuit board function of COB to a liquid crystal display panel. In particular, it is possible to form a plurality of fine thin film jumper wirings in the liquid crystal display panel by using a wiring designing method in the liquid crystal display panel, which has a great practical effect.

Further, the present invention can be applied to a liquid crystal display panel using a TAB or flip chip mounting method. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

[0023]

As described in detail above, according to the present invention, the following effects can be achieved. (1) One layer of wiring to the driver IC of the COB is sufficient, and unlike the conventional case, it is not necessary to form a through hole, the configuration can be simplified, and the reliability of connection can be improved. Moreover, since it is not necessary to form through holes, inexpensive substrate materials can be used.

(2) Wiring in the liquid crystal display panel is easy. That is, it is possible to easily form a plurality of fine thin film jumper wirings at low cost.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of a main part of a liquid crystal display module showing a first embodiment of the present invention.

FIG. 2 is an exploded schematic perspective view of the liquid crystal display module showing the first embodiment of the present invention.

FIG. 3 is a sectional view of a COB of a conventional liquid crystal display module.

FIG. 4 is a mounting plan view of a COB of a conventional liquid crystal display module.

FIG. 5 is a schematic exploded perspective view of a main part of a liquid crystal display module showing a second embodiment of the present invention.

[Explanation of symbols]

1,51 Liquid crystal display panel 2,52 Liquid crystal glass upper surface plate for display 3,53 Liquid crystal sealing adhesive 4,54 Liquid crystal glass lower surface plate 5-10,55-60 Liquid crystal upper surface connection terminal 11,13 Connection ball 12,61 Jumper wiring 12a First connection terminal 12b Second connection terminal 21 Connector 22 Silicon rubber 23a Insulating layer 23b Anisotropic conductive member 24a, 24b, 25a, 25b, 26a, 26b, 2
7a, 27b, 28a, 28b, 29a, 29b Contact point 31 COB (chip on board) 32 Glass epoxy substrate 33-38 Connection terminal 39, 40 Bonding wire 41 First driver IC 41a, 42a Lead terminal 42 Second Driver IC

Claims (3)

[Claims] 1. (a) A plurality of driver ICs for driving liquid crystal
A chip-on-board on which is mounted, (b) a liquid crystal display panel arranged above the chip-on-board, and (c) a lower contact portion is connected to a connection terminal of the chip-on-board,
A connector having an anisotropic conductive member whose upper contact portion is connected to a connection terminal of the liquid crystal display panel, and (d) a predetermined connection terminal provided on the back surface of the liquid crystal display glass upper surface plate of the liquid crystal display panel. And a jumper wiring for connecting between other predetermined connection terminals arranged in parallel on the same back surface, and (e) connecting the plurality of driver ICs on the chip-on-board by using the jumper wiring. Liquid crystal display module characterized by. 2. The liquid crystal display module according to claim 1, wherein the jumper wiring is formed on a lower surface plate of liquid crystal glass. 3. The liquid crystal display module according to claim 1, wherein the jumper wiring is formed on the back surface of the display liquid crystal glass upper surface plate.