JPH0443388A - Structure and assembling method for lighting type liquid crystal display - Google Patents

Abstract

PURPOSE:To make the area of the display part of the liquid crystal display large by providing printed board which have lighting means on the right and left flanks of a face lighting means in contact. CONSTITUTION:An external frame 10a in a rectangular prism shape is formed of a resin material which is painted in white and a photoconductor plate 10b is provided in the recessed part 10a1 of the external frame 10a; and printed boards 10c where two LEDs 10d and 10d are fixed is fixed on the right and left flanks of the photoconductor plate 10c and the LEDs 10a and 10d are fitted in holes formed in the right and left flanks of the photoconductor plate 10c. Further, wiring patterns for supplying currents to the LEDs 10d are formed on the printed boards with the LEDs. Consequently, the area of the display part of the liquid crystal display 12 where character, symbols, etc., are displayed can be made large.

Description

[Detailed Description of the Invention] Summary: Regarding the structure of an illuminated type liquid crystal display that irradiates light onto the liquid crystal display and its assembly method, the area of the display portion of the liquid crystal display for displaying characters, symbols, etc. can be increased, and the area of the display part for displaying characters, symbols, etc. can be increased, and The purpose of the present invention is to provide an illuminated type liquid crystal display structure and its assembly method that can improve work efficiency and reduce manufacturing costs by allowing assembly to be performed quickly. In an illuminated type liquid crystal display structure that irradiates light, a rectangular parallelepiped-shaped light guide plate that diffuses and emits light, and a wiring pattern that is fixed to both sides of the light guide plate via a light emitting means and connected to the light emitting means are provided. a covering member that covers the formed printed circuit board with light emitting means, the light guide plate and the printed circuit board with light emitting means such that the upper surface of the light guide plate is exposed and the lower end of the printed circuit board with light emitting means protrudes; , and guide portions fixed to both ends of both longitudinal sides of the covering member;
an elastic member fixed by the guide portion of the surface emitting means and having a large number of signal lines embedded therein; The liquid crystal display is fixed by the guide portion of the means, 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 light onto a liquid crystal display and a method for assembling the same.

In recent years, with the diversification of communication circumstances, the applications of mobile radio devices such as car phones are rapidly expanding.

An illuminated type liquid crystal display is used for the display section of the handset section of this type of car phone. This liquid crystal display displays characters and symbols such as T-talk numbers, and is constructed with a lighting effect so that the displayed characters and symbols can be seen at night. By the way, it is better for the characters, symbols, etc. displayed on the liquid crystal display to be as large as possible or to be able to display as many as possible, so the overall size of the device should be small and the display area of the liquid crystal display should be as wide as possible. There is also a demand for an assembly structure in which a liquid crystal display can be easily incorporated.

BACKGROUND OF THE INVENTION FIG. 3 is a side view showing the EIA of a conventional illuminated type liquid crystal display.

The illuminated type liquid crystal display 1 shown in this figure is a surface-emitting LED mounted on a printed circuit board 2 on which a desired circuit is formed.
e) 3, a rubber connector 4, a 7-segment type liquid crystal display 6 placed on the surface-emitting LEDa through a reflective diffuser plate 5, and a printed circuit board that connects the surface-emitting LED 3, the rubber connector 4, and the liquid crystal display. 2 and a presser metal fitting 7.7. Also,
A lead wire 3a for supplying current to the light emitting element (LED) protrudes from the surface emitting LED 3, and is fixed on the back surface with solder 8 through a through hole of the printed circuit board 2.

Here, the structure of the surface-emitting LED 3 will be explained with reference to FIGS. 4(a) and (b)e FIG. 4(a) shows the surface-emitting LED
A plan view of the ED3, and (b) a right side view.

In these figures, 3b is a tapered concave 13 in a rectangular parallelepiped.
This outer frame 3b is made of a resin material coated with white paint.c3c
is a light guide plate provided in the recess 3bl of the outer frame 3b, and this light guide plate 3c is made of a transparent resin material,
It has the effect of diffusing light and emitting light. 3d, 3d is L
ED, and is inserted and fixed into a horizontal hole 3b2 formed in the outer frame 3b. The lead wires 3a, 3a are connected to the LED 3d as described above, and by supplying current to the lead wires 3a, the LED 3d emits light, and the emitted light is diffused by the light guide plate 30. The upper surface of the light guide plate 3C emits light.

Next, the explanation will be given by returning to FIG. 3. The rubber connector 4 is
It is made of silicone rubber, and inside it,
A large number of carbon lines (conducting wires) that transmit information signals to the liquid crystal display 6 are passed through. One end of each of these carbon lines is connected to the signal pattern of the printed circuit board 20 circuit, and the other end is connected to the signal terminal of the liquid crystal display 6. Furthermore, since the rubber connector 4 is elastic, even if extra force is applied when fixing the liquid crystal display 6 with the presser metal fittings 7 at the end of assembly, the rubber connector 4 acts as a cushion and the liquid crystal display 6 is secured. It will not be damaged.

The reflective diffuser plate 5 is for equalizing the luminous intensity of the upper surface of the surface emitting LED 3. In addition, the light emission intensity on the top surface of the surface emitting LED 3 is determined by the light emission intensity near the LEDs 3d, 3d (
(inner part of the broken line shown in FIG. 4(a)) becomes strong, so the upper surface part is covered with a semi-transparent light-shielding plate 9, and the surface-emitting LED 3
This makes the emission intensity almost uniform.

According to such a configuration, the light from the surface emitting LED 3 can be almost evenly transmitted to the liquid crystal display 6 via the reflective diffuser plate 5, so even in darkness such as at night, the light from the surface emitting LED 3 can be transmitted to the liquid crystal display 6 almost evenly. Can identify displayed characters, symbols, etc.

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 protrude from the longitudinal side surface of the surface emitting LED 3,
Since the vertical width had to be narrowed, there was a problem in that the area of the display area on which 60 characters, symbols, etc. were displayed on the liquid crystal display was inevitably reduced.

In addition, a semitransparent light shielding plate 9 is used to make the light emission intensity of the surface emitting LED 3 uniform.
The part of the liquid crystal display 6 at the top of the installation position (the part inside the broken line shown in Fig. 4(a)) may have a slightly different luminous intensity compared to other parts, so it is difficult to display characters, symbols, etc. I try not to do that. Therefore, Fig. 4 (a
), the 6th minute to the tangent to the dashed circle indicated by the dashed-dotted line is marked with a letter.
Since it is not possible to display No. 8a, etc., a problem arises in that the display area of the liquid crystal display 6 becomes narrower.

The above-mentioned problem will be further exacerbated if the liquid crystal display 6 is of an alphanumeric type that displays characters, symbols, etc. in dots. This is because in the case of the alpha unimeric type, two light emitting diodes are required on each side of the surface emitting LED in the longitudinal direction, so two light emitting diodes are required on each side of the surface emitting LED in the longitudinal direction.
This is because the pair of L-shaped lead wires will protrude, and the translucent light shielding plates 9 must also be installed on both sides.

Furthermore, when assembling the above-mentioned illuminated type liquid crystal display, assembling the surface emitting ED 3, rubber connector 4, liquid crystal display 6, and presser metal fitting 7 on the printed circuit board 2 in this order makes it difficult to position each component. Since it is not easy, in reality, the liquid crystal display 6 is attached to the presser metal fitting 7, then the surface emitting LED 3 is attached via the reflective diffuser plate 5 and the semi-transparent light shielding plate 9, the rubber connector 4 is attached, and finally the The presser metal fitting 7 was fixed to the printed circuit board 2 during assembly. However, even if the assembly is performed in this manner, the assembly order is reversed, so the assembly still takes time and the work efficiency is poor. Therefore,! ! This poses a problem of high cost.

This proposal was made in view of these points,
It is possible to increase the area of the display part of the liquid crystal display that displays characters, symbols, etc., and by making it easier to assemble, it is possible to improve work efficiency, thereby reducing manufacturing costs. An object of the present invention is to provide an illuminated type liquid crystal display structure and an assembly method thereof.

Means for Solving Problems In an illuminated type liquid crystal display structure that irradiates light onto a liquid crystal display, there is a rectangular parallelepiped-shaped light guide plate that diffuses and emits light, and a light guide plate that is fixed to both sides of the light guide plate via light emitting means. , and a printed circuit board with a light emitting means on 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, and the printed circuit board with the light emitting means A surface emitting means comprising a covering member that covers so that the lower end thereof protrudes, and a guide portion fixed to both ends of both longitudinal sides of the covering member, and is fixed by the guide portion of the surface emitting means. is,
and an elastic member in which a large number of signal lines are embedded, and the liquid crystal display is fixed on the surface emitting means by a guide portion of the surface emitting means via a reflective diffuser plate that diffuses light. and a signal line of the elastic member is connected to a signal terminal of the liquid crystal display.

Further, in assembling the illuminated type liquid crystal display structure, the elastic S material is fitted into the guide portion of the surface emitting means, and a wiring pattern is formed on the lower end of the printed circuit board with the light emitting means of the surface emitting means. At the same time, the wiring pattern of the printed circuit board with the light emitting means and the wiring pattern of the printed circuit board are soldered to fix the surface light emitting means to the printed circuit board. Then, the liquid crystal display is fixed to the guide portion of the surface emitting means by connecting the signal line of the elastic member to the signal terminal of the surface emitting means through the reflective diffusion plate, and is fixed to the printed circuit board using a presser 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 side portions are not the portions of the liquid crystal display placed on the surface emitting means that actually display characters, symbols, etc., the area of the display portion of the liquid crystal display can be increased.

Furthermore, since the assembly method of the present invention is a method in which each component is fitted into a through hole and a guide portion, it is possible to assemble the container and to assemble it with a certain degree of accuracy. can be improved.

Embodiment Hereinafter, an embodiment 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.
FIG. 2 is a view seen from the direction of arrow Y shown in FIG. In these figures, parts corresponding to those of the conventional example shown in FIG. 3 are given the same reference numerals.

The illuminated type liquid crystal display IA shown in FIGS.
DIO and the rubber connectors 11.11 on both sides thereof, an alphanumeric type liquid crystal display 12 placed on the surface-emitting LEDIO via a translucent light-shielding plate 9.9 and a reflective diffuser plate 5, and a presser metal fitting 7. 7.

Here, the configuration of surface emitting LEDIO is shown in Fig. 2(a).
This will be explained with reference to (C). FIG. 2(a) is a plan view of the surface-emitting LEDIO, FIG. 2(b) is a partially cutaway front view of FIG. 2(a), and FIG. 2(c) is a right side view of FIG. 2(a).

In these figures, 10a is a rectangular parallelepiped-shaped outer frame, which is made of a white-painted resin material. 10b is a light guide plate provided in the recess 1f [510a1] of the outer frame 10a. IOC has 2 LED lods, 10d
A pre-printed circuit board with an LED fixed to it, a light guide plate 10
Fixed to the left and right sides of C, LED lod, 10
d are fitted into holes provided on the left and right side surfaces of the light guide plate 10C.

In addition, we also offer pre-printed circuit boards with LEDs, LEDIO (i to
A wiring pattern is formed to supply the current.

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

Next, the explanation will be given by returning to FIG. 1. The rubber connector 11 is made of silicone rubber as in 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 printed circuit board 20 circuit, and the other end is connected to the signal terminal of the liquid crystal display 12.

Furthermore, like the conventional example, the light emission intensity on the top surface of the surface-emitting LEDIO is equal to that of the LED lod that is the light source.

Since the area near 10d (the part of the broken circle shown in ¥21 (a)) becomes strong, the upper surface thereof is covered with a semi-transparent light shielding plate 9 to make the light emission intensity of the surface-emitting LEDIO as uniform as possible. .

According to the above-described configuration, the area of the display portion of the liquid crystal display 120 that displays 120 characters, symbols, etc. can be increased. This is because in the conventional example shown in FIG. 3, the L-shaped lead wires 3a and 3a protrude from the longitudinal side surface (front or back surface) of the surface-emitting LED 3, which reduces the vertical width. However, in the embodiment of the present invention shown in FIG. Since it is placed in close contact with the side surface, the width of the surface-emitting LEDIOQ only needs to be narrowed by the thickness of the printed circuit board 10c, and the left and right side portions where the width is narrowed are the portions of the liquid crystal display 12 where characters, symbols, etc. are actually displayed. Therefore, in view of this, the area of the display portion becomes larger than in the past.

Furthermore, translucent light-shielding plates 90 on the left and right sides of the surface-emitting LEDIO
Since this part is not a part that actually displays letters, number 8a, etc., the area of the display part can be made even larger than in the past.

In addition, when assembling this illuminated type liquid crystal display 1Δ, first insert the
Insert the end of the pre-printed board with LED 10C and solder the wiring pattern of the printed board 2 and the line pattern of the pre-printed board with LED 10c to create a surface-emitting LED.
Fix IO. Next, guide R1 of surface emitting LEDIO
The rubber connector 11 and the liquid crystal display 12 are fitted and fixed into Oe. Finally, fix the whole thing with a presser metal fitting 7. Therefore, assembly can be easily performed. Also,
Since this assembly method is a method in which each component is fitted into the through hole and the guide R10e, assembly can be performed with a certain degree of precision, thereby improving assembly precision.

Furthermore, since the length of the rubber connector 11 can be made almost the same as the length in the longitudinal direction (front and back sides) of the surface-emitting LEDIO, the number of internal signal lines increases accordingly.
It is also compatible with multi-signal type liquid crystal 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.

As described in detail, the present invention has the effect of increasing the area of the display portion of the liquid crystal display that displays characters, symbols, etc.

Furthermore, since it can be easily assembled, work efficiency can be improved, and manufacturing costs can thereby be reduced.

Furthermore, since assembly accuracy can be improved, there is an effect that high functional reliability can be obtained. others,
This has the effect of being able to handle a large amount of signals.

[Brief explanation of the drawing]

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 direction of arrow Y shown in FIG. 2(a), and FIG. (a) is from the surface shown in Fig. 1 (a) and (b) *
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. 3 is a conventional 4(a) is a plan view of the surface emitting LED shown in FIG. 3; FIG. 4(b) is a right side view of FIG. 4(a). be. 0a...Covering member, Ob...Light guide plate, Oc...Print with light emitting means Od...Light emitting means, Oe...Guide portion, 1...Elastic member, 2...Liquid crystal display. board,

Claims (1)

[Claims] 1. In an illuminated type liquid crystal display structure that irradiates light to a liquid crystal display (12), a rectangular parallelepiped-shaped light guide plate (10b) that diffuses light and emits light.
and light emitting means (10d) on both sides of the light guide plate (10b).
A printed circuit board with a light emitting means (10c) fixed through the light emitting means and on which a wiring pattern connected to the light emitting means (10d) is formed, the light guide plate (10b) and the printed circuit board with the light emitting means (10c). , a covering member (10a) that covers the light guide plate (10b) so that the upper surface thereof is exposed and the lower end of the printed circuit board with light emitting means (10c) protrudes;
A surface emitting means (1) comprising guide parts (10e) fixed to both ends of both longitudinal sides of the covering member (10a).
0); and an elastic member (11) fixed by the guide portion (10e) of the surface emitting means (10) and having a large number of signal lines embedded therein, the surface emitting means (10) On top is a reflective diffuser plate (
5) of the surface emitting means (10).
), the liquid crystal display (12) is fixed thereto, and the signal line of the elastic member (11) and the signal terminal of the liquid crystal display (12) are connected. 2. Fitting the elastic member (11) into the guide portion (10e) of the surface emitting means (10), and fitting the printed circuit board (1) with the light emitting means of the surface emitting means (10).
The lower end of the printed circuit board (10c) 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 with light emitting means (10c) and the printed circuit board (10c) are fitted.
The surface light emitting means (10) is fixed to the printed circuit board (2) by soldering to the wiring pattern 2), and the surface light emitting means (10) is placed on the surface light emitting means (10) through the reflective diffuser plate (5). ,
The signal line of the elastic member (11) is connected to the signal terminal, and the liquid crystal display (12) is fixed to the guide part (10e) of the surface emitting means (10). 2. The method of assembling an illuminated type liquid crystal display structure according to claim 1, characterized in that the structure is fixed to the printed circuit board (2) by means of presser fittings (7).