JP3043743B1 - LCD module mounting structure - Google Patents

Abstract

A signal line land and a printed circuit board (L) of a printed circuit board are exposed to external stress, particularly, stress in a horizontal direction with respect to a printed circuit board surface.
Provided is a mounting structure of an LCD module which prevents separation and disconnection of a soldered portion of a CD TAB from a signal line electrode portion. One or more holes (33) are provided on an LCD TAB plate surface (3) of an LCD module (2), and holes (1) of the same size are formed on a printed board (1) at positions corresponding to the holes of the LCD TAB.
1 for inserting the LCD TAB hole 33 and the printed circuit board hole 11 into the frame 5 on which the LCD module 2 and the printed circuit board 1 are mounted, and hooking the LCD module 2 and the printed circuit board 1. A projection 51 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD,
An LCDTAB which is mounted on a printed circuit board and has a driver mounted thereon and joined to the LCD.
The present invention relates to a mounting structure of an LCD module in which a signal line terminal B and a signal line land of the printed circuit board are soldered, and more particularly to a mounting structure of an LCD module for preventing problems such as peeling and disconnection of the soldered portion. .

[0002]

2. Description of the Related Art In a conventional mounting structure of an LCD module, an LCDTAB (Tape) of the LCD module is used.
Only the signal line electrode portion of Automated Bonding is soldered and fixed to the signal line land of the printed circuit board.

[0003]

In the conventional mounting structure of the LCD module, the device may be impacted by dropping or improper handling.
When stress such as torsion is applied, the weight of the LCD module is directly applied to the soldered portion, so that problems such as peeling and disconnection of the soldered portion have occurred.
In particular, in a device with a high risk of falling, such as a mobile phone or a remote control equipped with an LCD TAB, the soldered portion often fails due to impact, twist, or the like.

[0004] The stress applied to the soldering portion will be described separately in the vertical direction and the horizontal direction with respect to the surface of the printed circuit board. The vertical stress is not particularly problematic because it is suppressed by a case or the like. Regarding the stress in the horizontal direction, only the signal line electrode portion of LCDTAB is soldered, and no other measures are taken, and there is no sufficient durability.

A mounting structure of an LCD module comprising an LCD TAB, a circuit board and a frame, wherein an electrical connection between an input terminal of the TAB board and an output terminal of the circuit board is opposite to the LCD side of the circuit board. What is arranged on the surface is disclosed in Japanese Utility Model Laid-Open No. 4-77133. In this mounting structure, when an external stress is applied to the electrical connection portion, the TAB substrate is easy to move, and it is difficult to prevent the electrical connection portion from peeling or breaking.

Further, an LCD module in which a terminal portion of a TAB unit on which an IC is mounted is joined to a terminal portion of a flexible substrate and which can be made small and thin regardless of the pad layout of the IC is disclosed in Japanese Utility Model Laid-Open No. 5-8545. It is indicated in the gazette. Also in the mounting structure of this LCD module, the TAB unit is easy to move when an external stress is applied to the joint, so that it is difficult to prevent the joint from peeling or breaking.

In the present invention, peeling and disconnection of the soldered portion between the signal line land of the printed circuit board and the signal line electrode section of the LCD TAB against external stress, particularly, stress in the horizontal direction with respect to the printed circuit board surface. It is an object of the present invention to provide a mounting structure of an LCD module for preventing the problem.

[0008]

According to the present invention, in order to achieve the above object, the LCD module LCDTA is used.
One or more holes are provided on the surface of the B plate, and the LCD module is provided on a printed circuit board at a position corresponding to the hole of the LCD TAB.
A hole having the same size as the hole of the LCD module is provided in the frame for mounting the LCD module and the printed circuit board.
AB and the hole in the printed circuit board, and the LC
A projection is provided for hooking the D module and the printed circuit board.

In the present invention, preferably, the LCD
One or more protrusions are provided on the printed circuit board side of the module, and the printed circuit board is provided with holes for inserting the protrusions of the LCD module and hooking the LCD module.

In the present invention, preferably, the frame also serves as a shield structure.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows L according to one embodiment of the present invention.
FIG. 3 is a development view of a mounting structure of a CD module. This structure includes a frame 5, a printed board 1 mounted on the frame, and an LCD module 2 mounted on the board.

The LCD module 2 includes an LCD 4 and the L
It consists of an LCD TAB3 bonded to a CD. LCD T
AB3 has signal line electrodes 32 to be soldered to the signal line lands 12 of the printed circuit board 1 on both sides of one end of the TAB plate, and is joined to the LCD 4 for displaying liquid crystal at one end of the TAB plate.
LC controlling LCD display near the center of the upper surface of the TAB plate
A D driver 31 (LSI) is mounted, and a signal line electrode 32 is mounted.
And a hole C33 for inserting the projection B51 of the frame near the LCD4.

The printed circuit board 1 has a signal line land 12 at a position in contact with a signal line electrode 32 of the LCD TAB, and a frame protrusion B51 of the same size at a position corresponding to the hole C33 of the LCD TAB. Hole A11 for insertion
Having.

The frame 5 has an LCD TA on its mounting surface side.
It has a projection B51 for inserting the hole C33 of B and the hole A11 of the printed circuit board and hooking the LCD module and the printed circuit board.

With this mounting, even if horizontal stress is applied to the printed circuit board surface, the LCD
The TAB 3 and the printed circuit board 1 are formed by a protrusion B5 of the frame.
1 to prevent the displacement between the printed circuit board 1 and the LCD TAB 3, so that the stress applied to the soldered portion between the signal line electrode of the LCD TAB and the signal line land of the printed circuit board can be sufficiently suppressed. Thus, peeling and disconnection of the soldered portion are avoided.

[0016]

An embodiment according to the present invention will be described. FIG.
FIG. 3 is a development view of the mounting structure of the LCD module. As described in the embodiment of the present invention, this structure includes a frame 5, a printed board 1 mounted on the frame, and an LCD module 2 mounted on the board.

The LCD module 2 includes an LCD 4 and an LCD
TAB3. The LCD TAB 3 has five signal line electrodes 32 to be soldered to the signal line lands 12 of the printed circuit board 1 on both sides of one end of the TAB plate, and is joined to the LCD for displaying liquid crystal at one end of the TAB plate. Driver 31 for controlling the display of the LCD near the center of the upper surface of the LCD
(LSI), and a hole C33 for inserting the projection B51 of the frame from the signal line electrode 32 toward the LCD4.
Having.

The printed circuit board 1 is provided with five signal line lands 12 at positions in contact with the signal line electrodes 32 of the LCD TAB.
A hole A for inserting the projection B51 of the frame in the same size at a position corresponding to the hole C33 of the LCD TAB.
11

The frame 5 has an LCD TA on the mounting surface side.
It has two protrusions B51 for inserting the LCD module and the printed board through the hole C33 of B and the hole A11 of the printed board.

In the mounting structure of this embodiment, the hole A
11 is inserted through the projection B51 of the frame.
With the LCD driver mounting surface of DTAB facing up, the LCD
The projecting portion B51 of the frame is inserted into the hole C33 of the TAB and mounted, and the signal line electrode 32 and the signal line land 12 are mounted.
Is soldered (Example 1). By being mounted in this manner, horizontal displacement of the LCD module can be sufficiently prevented.

When the LCD module and / or the printed circuit board are laminated, it is necessary to further prevent the displacement of the LCD module. Therefore, the hole of the LCD TAB, the hole of the printed circuit board, and the projection of the frame are respectively provided. It is preferable that a plurality of portions be provided and mounted in the same manner as in the first embodiment (second embodiment). As a result, the prevention of displacement of the LCD module can be further enhanced.

In order to further prevent the displacement of the LCD module, as shown in FIG. 2, one or more projections are provided on the printed circuit board side of the LCD module, and the printed circuit board is provided with one or more projections. An example is shown in which a projection is inserted, a hole for engaging the LCD module is provided, a projection A21 of the LCD module is inserted into a hole B13 of the printed board, and the LCD module is mounted on the printed board. It is preferable to mount them in the same manner as in 1 and 2 (Example 3). For example, a clamper (that is, a protrusion A21) is provided in the LCD module 2, a hole B13 corresponding to the clamper is provided in the printed circuit board 1, the clamper is inserted into the hole, and both holes of the printed circuit board are sandwiched between both clampers. May be fixed. As a result, the prevention of displacement of the LCD module can be further enhanced.

The frame 5 can also be used as a shield structure. For example, the frame may be a case such as a mobile phone or a remote controller, and a printed circuit board and an LCD module may be directly mounted on the case in the same manner as in the first to third embodiments (fourth embodiment). Thereby, the stress applied to the LCD module and the printed board is buffered, and downsizing becomes possible.

[0024]

According to the LCD TAB mounting structure of the present invention, since the LCD module and the printed board are firmly locked by the frame, the signal of the LCD TAB is applied even when a stress is applied in the horizontal direction to the board surface. The pressure applied to the soldering portion between the line electrode and the signal line land on the printed circuit board can be sufficiently suppressed, and problems such as peeling and disconnection of the soldering portion can be prevented.

Further, by using the frame also as a shield structure, the stress applied to the LCD module and the printed board is buffered, and downsizing becomes possible.

In particular, in a device such as a portable telephone on which an LCD module is mounted, which is liable to be impacted or twisted due to a drop or the like, the present invention can be used to prevent problems such as peeling of a soldered portion and disconnection. can do.

[Brief description of the drawings]

FIG. 1 is a development view of a mounting structure of an LCD module according to one embodiment of the present invention.

FIG. 2 is a development view of a mounting structure of the LCD module in which a projection of the LCD module is inserted into a hole of a printed circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 LCD module 3 LCD TAB 4 LCD 5 Frame 11 Hole A 12 Signal line land 13 Hole B 21 Projection A 31 LCD driver 32 Signal line electrode 33 Hole C 51 Projection B

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/14

Claims (4)

(57) [Claims] An LCD and an LCD driver mounted on said LCD;
An LCD module mounting structure comprising an LCD TAB joined to a CD, mounted on a printed circuit board, and soldered with signal line terminals of the LCD TAB and signal line lands of the printed circuit board, One or two or more holes are provided on the plate surface of the LCD TAB, and holes having the same size as the holes of the LCD module are provided on the printed circuit board at positions corresponding to the holes of the LCD TAB. A mounting structure for an LCD module, comprising: a frame having a protrusion for inserting the hole in a printed board and hooking the LCD module and the printed board. 2. The mounting structure of an LCD module according to claim 1, wherein said LCD module and / or said printed circuit board are laminated and mounted on said frame. 3. The mounting structure of an LCD module according to claim 1, wherein one or more projections are provided on a printed circuit board side of the LCD module, and the projections of the LCD module are provided on the printed circuit board. A mounting structure of an LCD module, wherein a hole for inserting the LCD module and hooking the LCD module is provided. 4. The mounting structure for an LCD module according to claim 1, wherein the frame also serves as a shield structure.