JP2501936B2 - Illuminated liquid crystal display structure and assembling method thereof - Google Patents

Description

The present invention relates to an illumination type liquid crystal display structure for irradiating a liquid crystal display with light and a method for assembling the same. It is possible to increase the area of a display portion for displaying characters, symbols, etc. of the liquid crystal display, and it is easy. It is possible to improve the work efficiency by making the same in the assembly, and thereby to provide an illuminated type liquid crystal display structure and a method for assembling the same, which can reduce the manufacturing cost. In an illuminated type liquid crystal display structure for irradiating light, a rectangular parallelepiped light guide plate for diffusing light and emitting light, and a wiring pattern fixed to both side surfaces of the light guide plate via light emitting means and connected to the light emitting means A printed circuit board with a light emitting means, in which the light guide plate and the printed circuit board with a light emitting means are formed. The upper surface of the light guide plate is exposed,
Further, a surface light emitting means composed of a covering member for covering the printed circuit board with the light emitting means so that the lower end of the printed circuit board protrudes, and guide parts fixed to both ends of both side surfaces in the longitudinal direction of the covering member, and the surface light emitting means. And an elastic member having a large number of signal lines embedded therein, and a guide part of the surface emitting means on the surface emitting means via a reflection diffusion plate for diffusing light. The liquid crystal display is fixed by, and the signal line of the elastic member is connected to the signal terminal of the liquid crystal display.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminated type liquid crystal display structure for irradiating a liquid crystal display with light and a method for assembling the same.

2. Description of the Related Art In recent years, the use of mobile wireless devices such as car phones is rapidly expanding with the diversification of communication situations. An illuminated type liquid crystal display is used for the display portion of the handset portion of this type of automobile telephone. This liquid crystal display displays characters / symbols such as telephone numbers, and is configured to have an irradiation effect so that the characters / symbols displayed at night can be seen. By the way, it is desirable that the characters and symbols displayed on the liquid crystal display are as large or large as possible. Therefore, the size of the entire device is small and the display area of the liquid crystal display is desired to be as large as possible. There is also a demand for an assembly structure in which a liquid crystal display can be easily incorporated.

2. Description of the Related Art FIG. 3 is a schematic side view showing the structure of a conventional illuminated type liquid crystal display.

The illuminated type liquid crystal display 1 shown in this figure has a surface emitting LED (Light Emitting Diode) 3 mounted on a printed circuit board 2 on which a desired circuit is formed, a rubber connector 4, and a surface emitting LED 3 that reflects light. 7-segment type liquid crystal display 6 mounted via the diffusion plate 5, and surface emission
The LED 3, the rubber connector 4, and the liquid crystal display 6 are constituted by pressing metal fittings 7, 7 for fixing the liquid crystal display 6 to the printed circuit board 2. In addition, from the surface emitting LED3, the light emitting element (LE
A lead wire 3a for supplying a current to D) is projected, and is fixed by solder 8 on the back surface through the through hole of the printed board 2.

Here, the structure of the surface emitting LED 3 will be described with reference to FIGS. 4 (a) and 4 (b). Figure 4 (a) shows a surface-emitting LED3
Is a plan view, and (b) is a right side view.

In these figures, 3b is a rectangular parallelepiped recessed portion 3b.
An outer frame 1 is formed, and the outer frame 3b is made of a resin material coated with white. Reference numeral 3c denotes a light guide plate provided in the recess 3b1 of the outer frame 3b. The light guide plate 3c is made of a transparent resin material and has a function of diffusing light to emit light. 3d and 3d are LEDs, which are inserted and fixed in the lateral holes 3b2 formed in the outer frame 3b. This LED3d has
As described above, the lead wires 3a and 3a are connected to each other,
By supplying current to this lead wire 3a, LED3d
Is emitted, and the emitted light is diffused by the light guide plate 3c so that the upper surface of the light guide plate 3c emits light.

Next, returning to FIG. 3, description will be made. Rubber connector 4
Is made of silicone rubber, and a large number of carbon lines (conductors) for transmitting information signals to the liquid crystal display 6 are passed through the inside thereof. One end of each of the carbo lines is connected to the signal pattern of the circuit of the printed circuit board 2, and the other end is connected to the signal terminal of the liquid crystal display 6. Further, since this rubber connector 4 is elastic, even if an extra force is applied when fixing the liquid crystal display 6 with the holding metal fitting 7 at the end of assembly, the rubber connector 4 serves as a cushion and the liquid crystal display 6 is It will not be damaged.

The reflection diffusion plate 5 is for making the emission intensity of the upper surface of the surface emitting LED 3 uniform. Further, since the light emission intensity of the upper surface of the surface emitting LED 3 becomes strong in the vicinity of the LEDs 3d, 3d which are the light sources (circle part of the broken line shown in FIG. 4 (a)), the upper surface part is covered with the semitransparent light shielding plate 9. The emission intensity of the surface-emitting LED 3 is made almost uniform.

With such a configuration, the light of the surface-emitting LED 3 can be transmitted to the liquid crystal display 6 almost evenly through the reflection diffusion plate 5, so that the liquid crystal display 6 can be displayed even in the darkness at night. The displayed characters / symbols can be identified.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, in the above-mentioned illuminated type liquid crystal display structure, since the L-shaped lead wires 3a, 3a are projected from the side surface in the longitudinal direction of the surface emitting LED 3, the vertical width is correspondingly increased. There is a problem that the area of the display portion for displaying characters, symbols, etc. of the liquid crystal display 6 is inevitably reduced because the area needs to be narrowed.

Further, a semi-transparent light-shielding plate 9 is used in order to make the emission intensity of the surface-emitting LED 3 uniform, but the portion of the liquid crystal display 6 above the installation position of the semi-transparent light-shielding plate 9 (FIG. 4 (a)). Since the luminescence intensity of the part (shown by the broken line in FIG. 2) may be slightly different from that of the other parts, characters and symbols are not displayed. Therefore, since characters and symbols cannot be displayed in the portion up to the connection of the broken line circle shown by the one-dot chain line in FIG. 4 (a), the display portion of the liquid crystal display 6 becomes narrower accordingly.

If the liquid crystal display 6 is an alphanumeric type that displays characters / symbols and the like in dots, the above-mentioned problem will be further increased. because,
In the alphanumeric type, two light emitting diodes are required on each side of the surface emitting LED in the longitudinal direction.
This is because a pair of L-shaped lead wires will stick out and the semitransparent light-shielding plate 9 must also be installed on both side surfaces.

Further, when assembling the above-mentioned illuminated type liquid crystal display, it is easy to position each component by assembling the surface emitting LED 3, the rubber connector 4, the liquid crystal display 6 and the pressing metal 7 on the printed circuit board 2 in this order. Therefore, actually, the liquid crystal display 6 is attached to the holding metal fitting 7, then the surface emitting LED 3 is attached via the reflection diffusion plate 5 and the semitransparent light shielding plate 9, and further the rubber connector 4 is attached. Finally, The pressing metal fitting 7 was fixed to the printed circuit board 2 for assembly. However, even if the assembling is performed in this way, the assembling order is the reverse assembling, so that the assembling also takes time and the working efficiency is deteriorated. Therefore, there is a problem that the manufacturing cost becomes high.

The present invention has been made in view of the above circumstances, and it is possible to increase the area of a display portion for displaying characters and symbols of a liquid crystal display, and to make it possible to easily assemble it. It is an object of the present invention to provide an illumination type liquid crystal display structure and an assembling method thereof, which can improve work efficiency and thereby reduce manufacturing cost.

Means for Solving the Problems In an illumination type liquid crystal display structure for irradiating a liquid crystal display with light, a rectangular parallelepiped light guide plate that diffuses and emits light, and is fixed to both side surfaces of the light guide plate via light emitting means, And a printed circuit board with a light emitting means in which a wiring pattern connected to the light emitting means is formed, the light guide plate and the printed circuit board with the light emitting means, the upper surface of the light guide plate is exposed,
Further, the light emitting means is provided with a surface light emitting means including a covering member for covering the lower end portion of the printed board with the light emitting means so as to project, and guide portions fixed to both end portions of both side surfaces in the longitudinal direction of the covering member, and the surface emitting means. An elastic member fixed by the guide portion of the light emitting means and having a large number of signal lines embedded therein, and the surface emitting means of the surface emitting means via a reflection diffusion plate that diffuses light. The liquid crystal display is fixed by the guide portion, and the signal line of the elastic member is connected to the signal terminal of the liquid crystal display.

Further, in the assembly of the illuminated type liquid crystal display structure, the elastic member is fitted to the guide portion of the surface emitting means, and a wiring pattern is formed on the lower end portion of the stepped printed circuit board of the surface emitting means. The wiring pattern of the printed circuit board with the light emitting means and the wiring pattern of the printed circuit board are soldered while fitting the through hole of the printed circuit board, and the surface emitting means is fixed to the printed circuit board.
Then, on the surface emitting means, the signal line of the elastic member is connected to the signal terminal while interposing the reflection diffusion plate,
The liquid crystal display is fixed to the guide portion of the surface emitting means, and further, the whole is fixed to the printed board by a metal fitting.

According to the present invention, the printed circuit board with the light emitting means is closely attached to the left and right side surfaces of the surface light emitting means, and the surface of the surface light emitting means may be narrowed by the thickness of the printed circuit board with the light emitting means. Since the left and right surface-changing portions are not the portions that actually display characters, symbols, etc. of the liquid crystal display mounted on the surface emitting means, the area of the display portion of the liquid crystal display can be increased.

Further, since the assembling method of the present invention is a method of fitting each component into the through hole and the guide portion, the assembling can be easily performed and the assembling can be performed with a certain accuracy. Can be improved.

Example Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 (a) is a schematic side view showing the structure of an illuminated type liquid crystal display according to an embodiment of the present invention, and FIG. 1 (b) is a view seen from the arrow Y direction shown in (a). In these figures, parts corresponding to the parts of the conventional example shown in FIG.

The illuminated type liquid crystal display 1A shown in FIGS. 1 (a) and 1 (b) is a surface emitting LED 1 mounted on a printed circuit board 2.
An alphanumeric liquid crystal display mounted on the 0 and the rubber connectors 11 and 11 on both sides thereof and the surface emitting LED 10 via the semitransparent light-shielding plates 9 and 9 and the reflective diffusion plate 5.
It is composed of 12 and pressing metal fittings 7, 7.

Here, the structure of the surface emitting LED 10 is shown in FIG.
This will be described with reference to (c). Figure 2 (a) shows surface emission
A plan view of the LED 10, (b) is a partially cutaway front view of (a),
(C) is a right view of (a).

In these figures, 10a is a rectangular parallelepiped outer frame, which is made of a resin material coated with white. Reference numeral 10b is a light guide plate provided in the recess 10a1 of the outer frame 10a. 10c is a printed circuit board with LEDs to which two LEDs 10d and 10d are fixed, and is fixed to the left and right side surfaces of the light guide plate 10c. The LEDs 10d and 10d are fitted into holes provided on the left and right side surfaces of the light guide plate 10c. ing. In addition, the printed circuit board with LED
A wiring pattern for supplying a current to 10d is formed.

Reference numeral 10e is an L-shaped guide portion, which is fixed to both ends of the front and back surfaces of the outer frame 10a. The guide portion 10e serves as a guide for fixing the liquid crystal display 12 and the rubber connector 11, and the rubber connector 11 is fitted into the portions indicated by arrows Y1 and Y1 in FIG. The liquid crystal display 12 is fitted in the portion indicated by arrow Y2 in FIG.

Next, returning to FIG. 1, description will be made. Rubber connector 11
Is formed of silicone rubber like the conventional example, and a large number of carbon lines for transmitting information signals to the liquid crystal display 12 are passed through the inside thereof. One end of each of these carbon lines is connected to the signal pattern of the circuit of the printed circuit board 2, and the other end is connected to the signal terminal of the liquid crystal display 12.

Further, as in the case of the conventional example, the emission intensity on the upper surface of the surface emitting LED 10 is in the vicinity of the LEDs 10d, 10d which are the light sources (Fig. 2 (a)).
Since the circled portion (shown by the broken line) is strong, the upper surface portion is covered with the semitransparent light-shielding plate 9 so that the emission intensity of the surface-emitting LED 10 is as uniform as possible.

As described above, according to the configuration as described above, it is possible to increase the area of the display portion for displaying characters / symbols, etc. of the liquid crystal display 12. This is because in the conventional example shown in FIG. 3, since the L-shaped lead wires 3a, 3a protrude from the side surface (front surface or back surface) of the surface emitting LED 3 in the longitudinal direction, the vertical width is narrowed accordingly. However, in the embodiment of the present invention shown in FIG. 1, the LED-equipped printed circuit board 10c is provided on the left and right side surfaces of the surface-emitting LED 10. Because they were in close contact,
It suffices to narrow the width of the surface-emitting LED 10 by the thickness of the printed circuit board 10c. Moreover, the left and right side portions that have narrowed this width are not the portions that actually display characters, symbols, etc. of the liquid crystal display 12, so this In view of this, the area of the display portion becomes larger than that of the conventional one.

Furthermore, the parts of the semi-transparent light-shielding plates 9 on the left and right sides of the surface-emitting LED 10 are not the parts that actually display characters, symbols, etc.
From this, the area of the display portion can be further increased as compared with the conventional case.

Further, when assembling this illuminated type liquid crystal display 1A, first, in a predetermined through hole on the printed circuit board 2,
While inserting the lower end portion of the printed circuit board with LED 10c, the wiring pattern of the printed circuit board 2 and the wiring pattern of the printed circuit board with LED 10c are soldered to fix the surface emitting LED 10.
Next, the rubber connector 11 and the liquid crystal display 12 are fitted and fixed in the guide portion 10e of the surface emitting LED 10. Finally, the holding metal fitting 7 fixes the whole. Therefore, the assembly can be easily performed. Further, since this assembly method is a method of fitting each component into the through hole and the guide portion 10e, the assembly can be performed with a certain accuracy. Thereby, the assembling accuracy can be improved.

Furthermore, since the length of the rubber connector 11 can be made substantially the same as the length of the surface emitting LED 10 in the longitudinal direction (front and back surfaces), the number of internal signal lines is increased accordingly, and a multi-signal type liquid crystal is provided. It can also be used for displays.

In the case of a 7-segment type liquid crystal display, of the two rubber connectors 11 shown in FIG.
One rubber connector 11 may be used as a spacer.

EFFECTS OF THE INVENTION As described above, according to the present invention, there is an effect that the area of a display portion for displaying characters, symbols, etc. of a liquid crystal display can be increased.

Moreover, since the assembly can be easily performed, the work efficiency can be improved, and thus the manufacturing cost can be reduced.

Further, since the assembling accuracy can be improved, there is an effect that the functionally high reliability can be obtained. Besides, there is an effect that it is possible to deal with multiple signals.

[Brief description of drawings]

FIG. 1 (a) is a schematic side view showing the structure of an illuminated type liquid crystal display according to an embodiment of the present invention, FIG. 1 (b) is a view seen from the arrow Y direction shown in FIG. (A) is the surface emission shown in FIGS. 1 (a) and (b).
FIG. 2 (b) is a plan view of the LED, FIG. 2 (b) is a partially cutaway front view of FIG. 2 (a), FIG. 2 (c) is a right side view of FIG. 2 (a), and FIG. FIG. 4 (a) is a plan view of the surface emitting LED shown in FIG. 3, and FIG. 4 (b) is a right side view of FIG. 4 (a). is there. 2 ... Printed circuit board, 5 ... Reflective diffusion plate, 7 ... Holding metal fitting, 10 ... Surface emitting means, 10a ... Covering member, 10b ... Light guide plate, 10c ... Printed board with light emitting means, 10d. Light emitting means, 10e ...... guide part, 11 ... elastic member, 12 ... liquid crystal display.

Continuation of the front page (56) Reference JP-A-2-85880 (JP, A) JP-A-3-148630 (JP, A) Actual development Sho-60-150585 (JP, U)

Claims (2)

(57) [Claims] 1. A light guide plate (10b) in the shape of a rectangular parallelepiped that diffuses light and emits light in an illuminated type liquid crystal display structure for irradiating a liquid crystal display (12) with light.
And a printed circuit board (10c) with a light emitting means, which is fixed to both side surfaces of the light guide plate (10b) through the light emitting means (10d) and has a wiring pattern connected to the light emitting means (10d).
And the light guide plate (10b) and the printed circuit board with the light emitting means (1
0c) is coated so that the upper surface of the light guide plate (10b) is exposed and the lower end of the printed circuit board (10c) with light emitting means is projected, and the length of the coating member (10a). Surface emitting means (10) consisting of guide portions (10e) fixed to both ends of the side surface in the direction, and guide portions (10e) of the surface emitting means (10) are fixed, and a large number of An elastic member (11) in which a signal line is embedded, and a guide portion of the surface emitting means (10) on the surface emitting means (10) via a reflection diffusion plate (5) that diffuses light. 10e)
An illumination type liquid crystal display structure characterized in that the liquid crystal display (12) is fixed by and the signal line of the elastic member (11) is connected to the signal terminal of the liquid crystal display (12). 2. A guide portion (10e) of the surface emitting means (10).
The elastic member (11) is fitted to the printed circuit board (10) with the light emitting means of the surface light emitting means (10).
The lower end of c) is fitted into the through hole of the printed circuit board (2) on which the wiring pattern is formed, and the wiring pattern of the printed circuit board (10c) with the light emitting means and the printed circuit board (2).
The surface light emitting means (10) is fixed to the printed circuit board (2) by soldering with the wiring pattern, and the reflective diffuser plate (5) is interposed on the surface light emitting means (10) and The signal line of the elastic member (11) is connected to the signal terminal thereof, and the liquid crystal display (12) is fixed to the guide portion (10e) of the surface emitting means (10). The method for assembling an illuminated type liquid crystal display structure according to claim 1, characterized in that it is fixed to the printed circuit board (2) by a pressing metal fitting (7).