JPH0695084A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate the variations in mounting of a connecting substrate, to stabilize quality and to reduce the cost of production by providing positioning pins for positioning the connecting substrate by pressing one end thereof. CONSTITUTION:A connecting substrate mounting part 9 is provided with the positioning pins 4 for positioning the connecting substrate 1 by pressing one end thereof and the height of the positioning pins 4 is formed at the same thickness as the connecting substrate 1 or at a lower size. The positioning pins 4 are formed to a circular columnar or square columnar shape and are preferably provided at >=2 points on one flank of a back light housing 13. The connecting substrate mounting parts 9 which are provided on both flanks of the back light housing and are formed to have a specified inclination are provided with the positioning pins 4 of the same size as the thickness of the connecting substrate 1 or the size smaller than the thickness thereof respectively at two points on the flank of the back light and one end of the connecting substrate 1 is pressed to the positioning pins 4 and is thus positioned. The substrate is then fixed by a double coated adhesive tape 14. Then, the man-hours necessary for assembly are decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight structure which can be easily positioned when a connection substrate of a liquid crystal display device is attached. The present invention relates to a liquid crystal display device capable of mounting a connection board without variation and reducing the number of mounting steps.

[0002]

2. Description of the Related Art Conventionally, a connection board 1 to which an integrated circuit is connected
As shown in FIG. 3, it was positioned by alignment on the connection board mounting portions 19 formed on both side surfaces of the backlight housing 13 and having a certain inclination, and fixed by the double-sided adhesive tape.

In order to position the connection board 1 on the backlight housing 13, the connection board 1 to which a TAB (automatic bonding by tape carrier method) IC 12 is connected is held with both hands, and the bent portion of the TAB IC 12 is a backlight housing. Care is taken so that the end of the body 13 and the shield plate 2 do not come into contact with each other, and that the bent portion of the TAB IC 12 is properly bent.

Since the double-sided adhesive tape is attached to the connection board mounting portions 19 on both sides of the backlight housing 13,
The connection board 1 is positioned while floating from the connection board attachment portion 19 to determine the attachment position, and the connection board 1 is pressed and fixed to the connection board attachment portion 19 to which the double-sided adhesive tape 14 is attached.

The connection boards 1 thus attached to both side surfaces of the backlight housing 13 are connected to the signal processing board 7 by soldering via the connection jumper wires 6. The signal processing board 7 is screwed to the backlight housing 13
Fixed to.

[0006]

In the connection board mounting of such a conventional liquid crystal display device, since the connection board mounting position is not mechanically determined, it is necessary to adjust the alignment depending on the operator, the physical condition, and the poor condition. Variations occur, which causes variations in the mounting position, and there is a problem in quality stability.

In particular, since the connection board is attached with the TAB IC connected, when the bent portion comes into contact with the end face of the backlight due to the bending of the TAB IC,
There is a risk that the TAB IC may be rubbed by mechanical vibration or damaged by being pulled. Also TAB
Even if the IC comes into contact with the shield plate, there is a risk of damaging the TAB IC as well. Furthermore, since the TAB film is removed and the leads are exposed so that the bent portion of the TAB IC can be easily bent, there is a risk of short-circuiting and abnormal electrical characteristics when the metal shield plate is contacted. It was

As described above, the conventional mounting of the connection board requires careful work, which requires a large number of man-hours for the mounting work, thus increasing the manufacturing cost of the product.

The present invention solves such a problem, and an object of the present invention is to provide a device which can eliminate variations in attachment of a connecting board to stabilize the quality and reduce the manufacturing cost.

[0010]

According to the present invention, there is provided a liquid crystal panel, a plurality of integrated circuits connected by automatic bonding to the liquid crystal panel, and a connection board for connecting the plurality of integrated circuits to each other. A signal processing board that generates a signal to be displayed on the liquid crystal panel, a connection jumper wire that connects the signal processing board and the connection board, and the liquid crystal panel are held and formed on both side surfaces thereof with a predetermined inclination. Fix the connection board to the connection board attachment part,
In a liquid crystal display device including a backlight housing for supplying display light from an inscribed light source, and a shield plate for mounting and fixing the backlight housing, the connection board mounting portion includes the connection board. A positioning pin for positioning by contacting one end of the positioning pin is provided, and the height of the positioning pin is equal to or smaller than the thickness of the connection board.

It is desirable that the positioning pins have a cylindrical shape or a quadrangular prism shape, and that the positioning pins are provided at two or more locations on one side surface of the backlight housing.

[0012]

In the connection board mounting portion formed on both side surfaces of the backlight and formed with a certain inclination, positioning pins having a size equal to or lower than the thickness of the connection board are provided at two positions on each side surface of the backlight. The one end of the connection board is brought into contact with this positioning pin to perform positioning, and is fixed with a double-sided adhesive tape.

As a result, the number of steps required for assembling the connection board of the liquid crystal display device can be reduced, and stable quality can be maintained.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1A is a perspective view showing the configuration of an embodiment of the present invention,
(B) is an enlarged cross-sectional view showing the configuration of the main part of the embodiment of the present invention.

The embodiment of the present invention includes a liquid crystal panel 17, a plurality of TAB ICs 12 connected by automatic bonding to the liquid crystal panel 17, and a plurality of TAB ICs 1.
A connection board 1 that connects the two to each other, a signal processing board 7 that generates a signal to be displayed on the liquid crystal panel 17, and a connection jumper wire 6 that connects the signal processing board 7 and the connection board 1.
A backlight for holding the liquid crystal panel 17 and fixing the connection board 1 to the connection board attachment portions 9 formed on both side surfaces thereof with a predetermined inclination and supplying light for display by the light source 15 inscribed therein. A housing 13 and a shield plate 2 for mounting and fixing the backlight housing 13 are provided. Further, as a feature of the present invention, positioning is performed by bringing one end of the connection board 1 into contact with the connection board attachment portion 9. The positioning pin 4 is provided, and the height of the positioning pin 4 is equal to or smaller than the thickness of the connection board 1.

The positioning pin 4 has a cylindrical shape as shown in FIG. 2 (a) or a quadrangular shape as shown in FIG. 2 (b), and is provided at two or more positions on one side surface of the backlight housing 13. To be

As shown in FIG. 1B, the TAB IC 12 connected to the liquid crystal panel 17 is connected to the connection substrate 1 by soldering although not shown. A double-sided adhesive tape 14 is attached to a part of the connection board mounting portion 9, and one end of the connection board 1 is brought into contact with the positioning pin 4 and pressed against the double-sided adhesive tape 14 to be fixed to the backlight housing 13.

The position of the positioning pin 4 is set at an appropriate position on the connection board mounting portion 9 of the backlight housing 13 depending on the state of the connection board 1 to be mounted, and the height thereof is the same as the thickness of the connection board 1. Alternatively, because of the small size, the place where the TAB IC 12 is arranged does not have to be between the TAB ICs 12 to be arranged.

As described above, since the fixed position of the connection board 1 can be set only by contacting the positioning pin 4, the operator does not need to align the connection board 1.

[0020]

As described above, according to the present invention, the positioning pins are brought into contact with each other and fixed, whereby the connection board can be mounted accurately and the time required for the mounting work can be shortened. Further, since there is no variation in the mounting position, it is possible to prevent the bent portion of the TAB IC from coming into contact with the end face of the backlight and the shield plate, and it is possible to maintain stable quality.

[Brief description of drawings]

FIG. 1A is a perspective view showing a configuration of an embodiment of the present invention,
FIG. 6B is an enlarged cross-sectional view showing the configuration of the main part of the embodiment of the present invention.

FIG. 2A is a partial perspective view showing a cylindrical positioning pin provided on a connection board mounting portion according to the embodiment of the present invention;
FIG. 6B is a partial perspective view showing a positioning pin having a rectangular prism shape.

FIG. 3 is a perspective view showing a configuration of a conventional example.

[Explanation of symbols]

 1 Connection Board 2 Shield Plate 3 Caulking Claw 4 Positioning Pin 5 Display Hole 6 Connection Jumper Wire 7 Signal Processing Board 8 Mounting Hole 9, 19 Connection Board Mounting Portion 10 Shield Plate Caulking Portion 11 IC Chip 12 TAB IC 13 Backlight Housing Body 14 Double-sided adhesive tape 15 Light source 16 Diffuser 17 Liquid crystal panel

Claims (2)

[Claims] 1. A liquid crystal panel, a plurality of integrated circuits connected by automatic bonding to the liquid crystal panel, a connection board connecting the plurality of integrated circuits to each other, and a signal to be displayed on the liquid crystal panel. A signal processing board, a connection jumper wire connecting the signal processing board and the connection board, and a connection board mounting portion formed on both side surfaces thereof with a predetermined inclination while holding the liquid crystal panel. In a liquid crystal display device comprising a backlight housing for fixing and fixing the backlight housing to supply light for display by a light source inscribed therein, and a shield plate for mounting and fixing the backlight housing. , A positioning pin for positioning by bringing one end of the connection board into contact is provided, and the height of the positioning pin is equal to or greater than the thickness of the connection board. A liquid crystal display device characterized in that it is formed in a lower dimension. 2. The liquid crystal display device according to claim 1, wherein the positioning pin has a cylindrical shape or a quadrangular prism shape, and is provided at two or more locations on one side surface of the backlight housing.