JPH0114049Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a light-transmissive liquid crystal display in which the electrode leads of the liquid crystal display element are soldered to the wiring board, and the back side of the liquid crystal display element is illuminated to display information. It is related to the device.

FIG. 1 shows a typical conventional example of this type of device. In the figure, 1 is a liquid crystal display element;
2 is an electrode lead drawn out from both sides of the liquid crystal display element 1; 3 is a wiring board, for example a printed wiring board; 4 is a lead insertion hole provided on the wiring board 3 for inserting and soldering the electrode lead 2 therethrough; The hole 5 is a lamp serving as a light source, and 5 is a light guide plate made of a transparent synthetic resin or the like, which guides and reflects the light of the lamp 5 to illuminate the back surface of the liquid crystal display element 1.

The light guide plate 6 is fixed to the printed wiring board 3 by, for example, a screw body (not shown) that penetrates from the back side of the printed wiring board 3. Each electrode lead 2 of the liquid crystal display element 1 is inserted into each lead insertion hole 4.
It is inserted through the lead insertion hole 4 and soldered to a copper foil pattern (not shown) provided around the lead insertion hole 4 on the back side of the printed wiring board 3, thereby establishing an electrical connection with the pattern. Although not shown, a control circuit for driving the liquid crystal display element 1 and the like are mounted on the printed wiring board 3.

In the above configuration, the light from the lamp 5 spreads from the side surface of the light guide plate 6 to the entire light guide plate 6, and a scattering reflection film (not shown) printed in white is applied to the back surface of the light guide plate 6.
, and the back surface of the liquid crystal display element 1 is illuminated. In the liquid crystal display element 1, the voltage between the electrodes of the transparent electrodes (not shown) constituting the display pattern (not shown) is controlled by the control circuit to transmit or block light irradiated from the back side. By doing so, a predetermined display is performed.

By the way, in such a conventional device, as the number of electrode leads 2 of the liquid crystal display element 1 increases, it becomes difficult to insert the electrode leads 2 into the lead insertion holes 4 of the printed wiring board 3. is easily inferred. In addition, in the above configuration, the light guide plate 6 is fixed by screws, which has poor workability, and furthermore, as shown in FIG.
Since it is necessary to intervene, the electrode lead 2 is configured to be long, but if the electrode lead 2 is long,
The element 1 is susceptible to, for example, lateral displacement, resulting in poor vibration resistance.

This idea was made with these points in mind. An insulating frame having guide grooves for electrode leads is interposed between the liquid crystal display element and the wiring board, and the electrode leads of the liquid crystal display element are connected to the wiring board. The purpose of the present invention is to provide a liquid crystal display device that can be easily inserted into the lead insertion hole of the device, and can be easily assembled and improved in vibration resistance by holding the light guide plate and the liquid crystal display element in the frame. There is.

An embodiment of this invention will be described below based on the drawings.

FIG. 2 shows an example of a liquid crystal display device according to this invention, and the same parts as in FIG. In the figure, reference numeral 7 denotes a frame interposed between the liquid crystal display element 1 and the wiring board 3, which is made of insulating synthetic resin, etc., and is made of a hollow space 7a for press-fitting the light guide plate 6 and for lighting. It has a window 7b and the like. Guide grooves 8 are formed on both sides of the frame 7 to guide the electrode leads 2 of the liquid crystal display element 1 to the lead insertion holes 4 of the printed wiring board 3. The width of the guide groove 8 is approximately the same as the diameter of the insertion hole 4 on the element 1 side, and is smaller than the diameter of the insertion hole 4 on the printed wiring board 3 side, so that the width is tapered overall. It is formed.

L-shaped holding walls 9 are formed on the upper surface of the frame 7 to correspond to the four corners of the liquid crystal display element 1, and are press-fitted into positioning holes 10 formed in the printed wiring board 3 on the lower surface. A protrusion 11 is formed.

The assembly procedure for this device is as follows.

First, the light guide plate 6 is press-fitted into the space 7a of the frame 7 and fixed. At this time, the frame 7 and the light guide plate 6
It is also possible to provide uneven portions at appropriate positions on both sides to further strengthen the fixing force. Next, this frame 7 with the light guide plate 6 fixed thereon is attached to the printed wiring board 3.
Fix it in place. That is, the frame 7 is fixed to the board 3 by press-fitting the protrusion 10 formed on the frame 7 into the positioning hole 10 of the printed wiring board 3. At this time, the protrusion 11 is set to a length such that its tip protrudes from the back side of the positioning hole 10 of the printed wiring board 3, and the protruding tip portion is deformed by a method such as heat caulking. The frame body 7 may be fixed more securely. By fixing the frame 7 at a predetermined position on the printed wiring board 3 in this manner, the guide groove 8 and the lead insertion hole 4 are simultaneously aligned. Next, the liquid crystal display element 1 is attached to the printed wiring board 3. That is, each electrode lead 2 is inserted from the upper end opening side of the guide groove 8 and passed through the lead insertion hole 4 . At this time, the element 1 is held on the frame 7 by bringing the four glass end faces of the liquid crystal display element 1 into contact with the inner surfaces of the four L-shaped holding walls 9 provided on the frame 7. Fix it. After this, electrode lead 2
By soldering on the back side of the printed wiring board 3 to make electrical connections, a device as shown in FIG. 3 can be assembled.

In the liquid crystal display device assembled in this way, the light from the light source 5 is incident on the light guide plate 6 through the window 7b of the frame 7.
Perform the same operation as in Figure).

As is clear from the above description, the frame 7 is interposed between the liquid crystal display element 1 and the printed wiring board 3, and the protrusion 11 on the lower surface of the frame 7 is inserted into the positioning hole 10 of the printed wiring board 3. By press-fitting and fitting, the frame 7 with the light guide plate 6 fixed therein is fixed at a predetermined position on the printed wiring board, and the electrode leads 2 of the liquid crystal display element 1 are connected to the frame 7.
Since the electrode lead 2 is guided through the guide groove 8 provided in the lead insertion hole 4 of the printed wiring board 3, the electrode lead 2 can be inserted reliably and easily. Furthermore, since the light guide plate 6 can be fixed to the printed wiring board 3 via the frame body 7 by simply fitting it into the space 7a of the frame body 7, the light guide plate 6 can be fixed more easily than conventional screw fastening means. In addition, since the glass end surface of the liquid crystal display element 1 is brought into contact with the retaining wall 9 provided on the frame body 7, lateral displacement of the element 1 is suppressed, thereby improving vibration resistance. It is possible to improve the

As described above, this invention forms guide grooves for the electrode leads of the element in the frame interposed between the liquid crystal display element and the wiring board, so that the electrode leads can be easily inserted into the lead insertion holes of the wiring board. Moreover, since the frame body also has the function of positioning and fixing the light guide plate in a predetermined position with respect to the wiring board, and the service of holding the light guide plate and the liquid crystal display element, assembly is simplified and vibration resistance is achieved. Accordingly, it is possible to provide a liquid crystal display device that can improve performance.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional liquid crystal display device, FIG. 2 is an exploded perspective view showing an example of the liquid crystal display device according to the invention, and FIG. 3 is a perspective view after the structure shown in FIG. 2 is assembled. 1...Liquid crystal display element, 3...Wiring board, 5...
Light source, 6... Light guide plate, 7... Frame, 7a... Hollow space, 8... Guide groove, 9... Holding wall, 10... Positioning hole, 11... Protrusion. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A liquid crystal display element having a plurality of electrode leads, a wiring board having a lead insertion hole through which the electrode leads of the liquid crystal display element can be inserted and into which the electrode leads can be brazed, and a wiring board on the back side of the liquid crystal display element. a light guide plate positioned to guide and reflect light from a light source to illuminate the back surface of the liquid crystal display element; an insulating frame interposed between the liquid crystal display element and the wiring board; and the frame body. a cavity formed in the frame to fit and hold the light guide plate; a guide groove formed in the frame to guide the electrode lead of the liquid crystal display element to the insertion hole; a holding wall that comes into contact with a glass end surface of the liquid crystal display element to hold the liquid crystal display element; a lighting window that is formed on the frame and allows light from the light source to enter the light guide plate; and a light window that is formed on the wiring board. A liquid crystal display device comprising a positioning hole and a protrusion formed on the lower surface of the frame and press-fitted into the positioning hole.