JPH0132699Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a holding device for a conductive press-fitting connector in a liquid crystal display device, and more specifically, to a device for illuminating a liquid crystal display device from behind using a light guide plate. The present invention relates to a liquid crystal display device with back lighting.

[Problems to be solved by conventional techniques and ideas]

A conventional device of this type will be explained with reference to FIGS. 3 to 5.

FIG. 3 is a perspective view showing the connection relationship between the electrodes of the liquid crystal display panel and the conductive press-contact connector in this type of device. In general, the liquid crystal display board 1 is composed of a lower substrate 1a on which many electrodes 2 are arranged in parallel, and an upper substrate 1b which is stacked on top of the lower substrate 1a so that the electrodes 2 are exposed, and a liquid crystal material is sealed inside. has been done.
On the other hand, what electrically connects the external circuit board 4 and the liquid crystal display board is a rod-shaped conductive press-fitting connector 3 made by alternately laminating conductive rubber 3a and insulating rubber 3b, and connects each terminal on the circuit board 4. (not shown) and each electrode 2 of the lower substrate 1a so that each conductive rubber 3a is disposed at a position corresponding to the upper substrate 1a.
A conductive pressure welding connector 3 is placed on top of the circuit board 4.
The liquid crystal display board 1 is electrically connected to the circuit board 4 by compressing and holding the space between the lower board 1a and the lower board 1a.

FIG. 4 shows an example of a holding device for the conductive pressure connector 3 when a light guide plate 5 is provided behind the liquid crystal display plate 1 to guide light from a light source (not shown) for back illumination of the liquid crystal display plate 1. It shows.

As can be seen from the figure, a frame 6 is arranged on the liquid crystal display panel 1. The frame body 6 is partitioned into a plurality of chambers 6a and 6b, and the central chamber 6a accommodates the light guide plate 5, and the side chamber 6b accommodates the conductive pressure contact connector 3 having a rectangular cross section. As described above, the conductive pressure contact connector 3 is compressed between the circuit board 4 and the liquid crystal display board 1, but at this time, since the side part is restricted by the wall of the frame 6, It is designed to contact each terminal and each electrode on the liquid crystal display board 1 with equal pressure.

However, in this device, since the frame 6 is large and has a complicated shape, the mold is expensive and the manufacturing cost increases.

FIG. 5 shows another example of a holding device for a conductive pressure-connecting connector, in which the frame body 6 is formed of a thin iron plate or the like, and the interior is not partitioned into a plurality of chambers. The conductive pressure contact connector 3 is housed therein, and the conductive pressure contact connector 3 is directly sandwiched between the side wall 5a of the light guide plate 5 and the inner wall 6e of the frame 6.

In the case of this device, the frame body 6 has a relatively simple shape and can be molded using a thin iron plate, etc., so the manufacturing cost of the mold etc. is not very high, but it is generally made of synthetic transparent resin such as acrylic. The light guide plate 5 has a side wall 5a that is an inclined surface due to a draft angle that is difficult to avoid in manufacturing, and as a result, the side wall 5a and the inner wall surface of the frame 6 are not parallel, making it difficult to conduct electricity. There is a risk that poor conduction may occur due to the pressure welding connector 3 not being compressed uniformly. By the way, the light guide plate used in this type of device is 10mm thick.
If the draft angle is 5 degrees, there will be a difference of about 0.9 mm between the top and bottom of the side wall.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a holding device for a conductive press-fitting connector in a liquid crystal display device, which is inexpensive and ensures electrical continuity between a circuit board and a liquid crystal display board.

[Means for solving problems]

In order to achieve the above object, the present invention has a structure in which a liquid crystal display board and a light guide plate are stacked and housed in a frame, and a conductive pressure welding connector is inserted between a side wall of the light guide plate and a wall of the frame via a spacer. It is characterized by the insertion of

[Example of idea]

FIG. 1 is an exploded perspective view of an embodiment of the present invention. In the figure, a light guide plate 5 made of transparent acrylic is superimposed on a liquid crystal display panel 1 in which a liquid crystal material is sealed between a lower substrate 1a and an upper substrate 1b, and housed in a frame 6. The frame 6 has a U-shaped cross section with a display window 6c, a notch 6d, etc., and is integrally formed by press working from a thin iron plate, aluminum plate, or the like.

In the frame 6, the conductive pressure contact connector 3 is inserted between the both side walls 5a of the light guide plate 5 and the inner wall 6e of the frame 6 with a spacer 7 interposed therebetween. As is clear from the figure, the spacer 7 has an elongated plate shape, and has protruding walls 7a in a direction perpendicular to the longitudinal direction at both ends and a middle part thereof, and each conductive pressure welding connector 3 is connected to the spacer 7 by the protruding walls 7a. It forms a room for storage.

FIG. 2 is a cross-sectional view of the embodiment shown in FIG. Both sides of the electrically conductive pressure welding connector 3 are held parallel to each other by a spacer 7 having an inclined surface 7b equal to θ on one side. Further, the bent piece 7c formed at the upper end of the spacer 7 comes into contact with the upper surface of the light guide plate 5 when the spacer 7 is inserted, and the width of the gap into which the conductive pressure welding connector 3 is inserted, in other words, the side surface of the conductive connector 3 is It regulates the compressive force of

Therefore, if the end face of the frame 6 is fixed to the circuit board 4 with screws or adhesive, the conductive pressure connector 3 will receive an even compressive force in the vertical direction.
The terminals on the circuit board 4 and the electrodes 2 on the liquid crystal display board 1 are brought into strong pressure contact and electrically connected to each other.

In the above embodiment, the liquid crystal display panel 1 has the electrodes 2 on both sides, but it is obvious that the device may have the electrodes on only one side, and in that case, the spacer 7 also has the electrodes on one side. It will be inserted only in

In addition, if the spacer is made of a material with a light reflecting surface such as an aluminum plate or white resin, it is possible to prevent light from leaking from the end face of the light guide plate, improving the light collection efficiency of the light guide plate. do.

[Effect of idea]

Since the present invention is as described above, the conductive pressure welding connector receives a uniform compressive force by the spacer,
The circuit board and the liquid crystal display board can be electrically connected reliably, and the frame structure can be simplified, so costs do not increase unnecessarily and manufacturing can be done at low cost. It is possible.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2 is a sectional view of the embodiment of Fig. 1, and Fig. 3 is an exploded perspective view illustrating how the conductive insulation displacement connector is used in this type of device , Figure 4 is an exploded perspective view of the conventional example.
FIG. 5 is an exploded perspective view of another conventional example. 1... Liquid crystal display board, 2... Electrode, 3... Conductive pressure contact connector, 4... Circuit board, 5... Light guide plate,
5a... Side wall of light guide plate, 6... Frame, 6e... Inner wall of frame, 7... Spacer.

Claims (1)

[Scope of utility model registration request] A light guide plate is placed behind the liquid crystal display panel, back illumination is performed by the light guided by the light guide plate, and a conductive pressure welding connector is placed on the electrode on the liquid crystal display plate on the side where the light guide plate is placed. , a liquid crystal display is performed by a control signal obtained through a conductive pressure-welding connector, and the liquid crystal display board and the light guide plate are stacked and housed in a frame, and the side wall of the light guide plate and the inner wall of the frame A conductive pressure welding connector is inserted into the gap between the two through a spacer, and the conductive pressure welding connector is electrically connected to the electrodes on the liquid crystal display board with both side walls of the conductive pressure welding connector pressed in parallel. A holding device for a conductive pressure contact connector in a liquid crystal display device.