JPH11344943A - Transmissible display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a transmissible display device which saves electric power by minimizing the number of light emitting diodes as far as possible and creates soft luminous designs, luminous pictures of characters and light sources. SOLUTION: The light emitting diode 3 is made to emit light in various states by a power source section for supplying electric power to the light emitting diode 3. An optical waveguide 1 for leading the luminous flux obtd. by this light emission is composed of a translucent or transparent flat plate and a groove or hole 2 for insertion of the light emitting diode 3 is formed on any side of this flat plate. The light emitting diode 3 is inserted into this hole 2 to make optical coupling dense. Light scattering parts 5, 8 are constituted over the entire surface or part of the flat plate and the transmitted light of the characters or designs is created by causing the light emission of the light scattering parts 5, 8 constituted in the entire part of the surface or part thereof. The transmitted light of various colors emitted from the light scattering parts is created by forming the plate into a multilayered structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art Recently, the efficiency of light emitting diodes (LEDs) has been rapidly improved, and they have been used as illuminating lamps. There is also an idea that an LED is not suitable for a lighting device because it has a good luminance but has a property that light travels straight forward, and thus irritates eyes. However, LED
The attraction of this is that it can display color and the elements are very small. In addition, since the power efficiency has been remarkably improved, it has become worthy of reexamination from the viewpoint that, when used in a portable device, a device with less battery wear can be obtained. However, the illumination means using LEDs which are currently frequently used are LEDs having strong coherence.
(Light emitting diode) directly sees the light, etc., so it lacks aesthetic composition or adversely affects the eyes. However, if the light emitted by the LED is a transparent column or flat plate as the light guide, the light flux travels with little attenuation in the light guide, and
If scratches or grooves are made on the surface parallel to the running surface, the light generated from the LED will be irregularly reflected by these scratches or grooves, or if a scattering part is created by mixing a fibrous medium with a different refractive index inside, the light flux It became clear that the scattered image clearly emerged in the right angle direction, whereby an illuminating device using flat indirect light with less emission unevenness was obtained. Further, when the light guide is made of a transparent material, pictures and characters can be seen from the front and back surfaces, and the evacuation lamp can be made of one light guide, so that the thickness can be reduced and the power consumption can be reduced. In addition, when the light guide is composed of many layers and light-emitting diodes having different light emission colors are used for each light guide, only the light-emitting surface and the light-emitting characters can be visually observed in various colors, and a signboard or a guide sign that has not existed in the past. can get. In addition, if this method is used for backlight devices for liquid crystal devices such as information devices, it is possible to reduce the power consumption of telephones, data collection devices (also called data capture devices) and illuminated touch panel devices, and it is evident that battery life is significantly extended. Became. The inventor has already reported that the number of diodes and power are relatively small, and that the entire three-dimensional light emission of a decorative wall combining glass alone or a glass plate with various media, or a multilayer structure of glass and resin can be achieved. Based on the above ideas, it was also clarified that the windows, signs, and floor luminaires that make the picture float in the space of the body and the transparent body could be easily configured based on the above idea.
By further improving this idea, the present invention provides a small-sized transmissive display device with small unevenness in the light emitting surface and low power consumption.

[0002]

2. Description of the Related Art FIG. 9 is a view for explaining the structure of a representative guide plate or the like according to the first prior art. Reference numeral 91 designates a sidelight method using a fluorescent light emitting linearly as a scattering light source. FIG. 1 illustrates an explanatory view of a so-called display device.
In this conventional example, it is mainly used for evacuation lights and signboards.
A scattered light source such as a fluorescent lamp or an incandescent light bulb is used.
Further, the scattered light source body 91 is incorporated in the reflection frame body 94, is slightly separated from the display unit 92, and is attached by a metal fitting (not shown) so as not to directly receive the heat of the light emitting body. In some cases, the frame 94 also incorporates an illumination controller or the like. Further, the display unit 2 is made of glass or plastics, and a picture is printed or engraved on the surface thereof. 9
The light from one is softened, or the light shield 96 is inserted between two display panels to prevent light interference between the two display panels. In some cases, the scattered light source 91 is incorporated into the frame 94, or light is directly applied to the surface of the display unit from the outside. Most of the light emitted from the scattered light source 91 configured as described above travels in the air, and the light is diffusely reflected by the cover body, but does not travel in the medium in a completely parallel state. FIG. 10 shows the light source 91 and the light emitting diode 9 based on the concept of learning the conventional example shown in FIG.
7 and 97 'illustrate a second conventional example. In the second conventional example, a large number of light emitting diodes 97 are provided.
Is attached to the printed circuit board 98 as shown,
Further, it is disposed in the reflection frame 99 and is attached to the display unit 92 by a metal fitting (not shown) slightly away from the display unit 92. An illumination controller and the like are sometimes incorporated in the frame 99. Reference numeral 94 denotes a decorative frame. However, the light emitting diode 9 shown in FIG.
7, the light emitted from the light emitting diode 97 basically has coherence, runs on the surface of the display surface 92, or has a strong directivity as shown in FIG. The light emission of the portion indicated by B on the display surface 92 where the light emitted from 97 'and 99 overlaps is abnormally strong, and uneven light occurs. In order to avoid the unevenness phenomenon that occurs in the second conventional example, it is necessary to arrange many light emitting diodes 97 not only on the lower side of the figure but also on the upper side and both side surfaces. Because of this, the power consumption of the entire panel is almost proportional to the number of light emitting diodes.
Even if the power consumption per light emitting diode is small, the power consumption of the entire panel becomes large. Therefore, in recent years, as a backlight of a liquid crystal display panel used in an information processing apparatus, an EL (electroluminescence) element which consumes less power and is based on surface light emission is used. However, a DC-AC converter and a special driving circuit are required, so that not only the cost becomes high but also the power consumption is not always small. On the other hand, in the conventional example in which a pattern is expressed using light emitting diodes based on the conventional concept, light emitting diodes are arranged in a matrix over the entire display surface of a plane, and this light emitting diode is less than the response of the human eye. Lights are sequentially turned on at a speed to make a picture, or a positive image is arranged on the surface of the light emitting diode to make a transmission image. However, in this method, a person looks directly at the light emitted from the light emitting diode and therefore feels very bright, and at the same time, becomes a very sharp dot-like pattern that disturbs emotions and is not suitable for humans. Also, a very large number of diodes are required. By the way, in recent years, the luminous efficiency of light-emitting diodes has shown great progress,
In order to reduce the light emitting state and improve the directivity,
Studies have been made on lighting lamps by attaching polyethylene or epoxy lenses to the light emitting diodes themselves. As a result, the luminous efficiency of the light emitting diode exceeds that of an incandescent light bulb, and can be applied to various fields. In view of the above, the present invention provides a small, lightweight, transmissive display device with little light emission unevenness and very low power consumption, which is suitable for industrial fields such as information equipment and display boards.

[0003]

According to the present invention, there is provided a transmission type display device for reducing the number of light-emitting diodes to save power and for producing a picture and an illuminated surface without uneven light emission.

[0004]

SUMMARY OF THE INVENTION At least one transparent or translucent flat optical waveguide on which one or more light emitting diodes are mounted, and one part for partially emitting the optical path. By forming a light-scattering portion with an uneven surface or minute unevenness, a required portion of each panel surface emits light.

A power supply unit for emitting light from the light emitting diodes, at least one or more light emitting diodes, and an inorganic transparent material such as quartz and glass, and an organic transparent material such as epoxy resin, polycarbonate and acrylic resin are arranged in series. At least one or more flat light guides that are transparent or translucent with respect to the light emitting source, or transparent or translucent when viewed visually. Further, the light-emitting diode mounting portion at the end of the light guide is made thicker than the flat plate as necessary, and furthermore, a light-emitting diode mounting hole or groove is formed and the light-emitting diode is inserted into the hole or groove. Then, by forming a minute light scattering surface on a part of the light guide or on the front surface or the back surface of the light path body, the coherent light flux is scattered by the light scattering surface, thereby causing the light guide surface to emit light in a planar manner, By using the scattered light, a transmissive display device having a uniform light emitting surface for making a transparent or translucent document placed on the panel surface visible even in the dark.

A power supply unit for emitting light from the light emitting diodes, at least one light emitting diode and at least one plate-shaped light guide which is transparent or translucent, and at least one plate-shaped light guide are provided. If necessary, the mounting hole for the light emitting diode is made slightly thicker than the flat plate, and the light emitting diode is inserted into the hole. Further, the light scattering portion formed on the front surface, the back surface, or the entire surface of the light guide path is formed of a transparent or translucent writing screen, and the light scattering portion is formed of minute projections or recesses. Is a transmissive display device that emits light in a planar or linear manner.

It is also possible to provide a transmissive display device having at least one or more flat light guides, forming cutouts along the plane of the flat plate, and uniformly emitting light on the entire panel surface. is there.

In some cases, the light guide is composed of a number of layers having good transparency, and a light emitting diode having a different emission color is attached to each layer, and various color patterns between the layers are displayed on the panel surface.

The light scattering portion may be constituted by an uneven surface, the light scattering portion may be constituted by a cut along the contour of a picture or a character, and at least one or more light emitting diodes and quartz, glass, A series of transparent or translucent at least one polygonal column-shaped light guide such as epoxy resin, polycarbonate, acrylic resin, etc. can be added. By forming a pattern such as a character on one of the front and back surfaces with an uneven surface, and forming a light scattering portion having fine unevenness like a grain on one of the concave surface or the convex surface, the light scattering portion An optical image may be formed on the front or back surface of the panel to emit light at an arbitrary position on the panel surface.

[0010] The light scattering portion may be formed of a fine grain pattern.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[0012]

[Embodiment 1] FIG. 1 shows a configuration example of a first embodiment of a transmissive display device according to the present invention as a sectional view (a) and a front view (b). In the drawings, parts having the same functions are numbered with the same numerals, and the same numbers are similarly applied to the following figures. In FIG. 1, reference numeral 1 denotes a plate-shaped light guide made of a series of transparent or translucent organic or inorganic media such as quartz, glass, epoxy resin, polycarbonate, and acrylic resin. A hole 2 for inserting the light emitting diode 3 was formed on a part of any side surface of the light guide 1 by a minute uneven surface formed on the upper part of the path, for example, a light scattering part formed by a grain of sand. In the prototype example, an acrylic square plate of 10 mm square was used as the light guide 1, and a hole 2 having a depth of 7 mm and a diameter of 5 mm was formed substantially at the center as shown in the figure. Further, the light emitting diode 3 may be inserted so as to fit into the hole 2, and may be fixed in the hole 2 by using an instant adhesive in some cases. As shown in the cross-sectional and front views, the light emitting diode 3 is disposed in a hole 2 having a diameter of 5 mm formed in one light guide, and the light emitting diode 3 is connected to an electric control circuit (not shown) by a lead wire 4. , So that the light emitting diode emits light according to the control operation. In the case of a telephone, the control operation is an operation mode according to the operation function, such as a liquid crystal panel of an information device or a touch panel, in accordance with the function operation. Thus, when the power switch is turned on and the light emitting diode 3 emits light, the light flux is changed to the light guide path 1.
Drive inside. When this light beam reaches the light scattering portion formed by the cut 8, the light beam scatters, and this scattered light forms a clear light image along the groove 8 of the transparent light guide 1 and the light is scattered at this portion. Is refracted and spreads in the width direction of the surface, and at the same time, the directivity of light is reduced and the panel surface 6
The light spreads over the entire surface of the building. Subsequently, the luminous flux travels further straight and reaches the second scattering section 5, where the entire surface of the opening of the scattered light panel is made brighter and more uniform with a light amount equal to or greater than the backlight of the EL element according to the color of the light emitting diode. It was projected. The light thus produced transmits through the liquid crystal panel 9 and almost completely transmits through the portions of the characters and pictures displayed on the liquid crystal to be transmitted. Was. As shown in FIG. 1, backlights of various colors as well as a single color can be obtained by the following configuration.
That is, in FIG. 1, the lead wire 4 is simply shown as two lines as an example using a monochromatic light emitting diode. However, in a green and red two-element encapsulated light emitting diode, one common terminal and two drive lines are used. The panel surface has various colors by changing the voltage level and the light emission color of the diode according to each function. Was able to emit light. Although a lead-type light emitting diode is shown here, the luminous efficiency is further improved by incorporating a side surface type surface mounted light emitting diode or a diode chip. The power consumption of the prototype example described above is only 0.05 W per color light, and it has been confirmed that a backlight having good luminance can be formed with a small power of 1/10 or less as compared with an EL backlight. In addition, the control operation of the light emitting state is such that if the phone is in use, the state of battery wear is lit in red on the entire panel, and the normal panel display is green and an operation mode according to the operation function. It goes without saying that a liquid crystal panel of an information device or a touch panel follows the functional operation of the touch panel. Reference numeral 10 denotes a coverlay.

[0013]

Embodiment 2 FIG. 2 shows an example of the configuration of a transmission type display device according to a second embodiment of the present invention. Also,
(A) is a perspective view of the guide plate, (b) is a partially enlarged view of characters written in the perspective view, and is a schematic illustration in which a fine uneven portion is formed on the convex surface, and (c) is a fine uneven surface on the convex surface. Are respectively shown as schematic diagrams when the light scattering portion is formed. In the figure, parts having the same functions as those in FIG. 1 are numbered by the same numerals. In FIG. 2, reference numerals 1 and 1 ′ denote a two-plate optical waveguide formed by appropriately selecting a series of transparent or translucent organic or inorganic media such as quartz, glass, epoxy resin, polycarbonate, and acrylic resin. FIG.
Is a micro uneven surface formed on the upper part of the above-mentioned square plate light guide,
For example, in the light scattering portion formed of a grain, the light emitting diodes 3 and 3 ′ are inserted into grooves or holes formed on a part of any side surface of the light guide 1 not shown. Further, the light emitting diodes 3 and 3 'may be inserted so as to fit into the holes 2, and in some cases, the holes 2 may be inserted using an instant adhesive.
It may be fixed inside. Reference numerals 21 and 22 denote a second light scattering portion formed of a pattern such as a character. In the drawing, the light scattering portion 21 is configured to have a structure described later so that the first light guide 1 emits light of “acceptance”. Further, a light scattering section 32 is formed in the second light guide 1 ′ so as to emit light of “end”. Although the figure shows an example in which characters are engraved on the obliquely inclined surface, it may be configured on the viewing surface or the back surface. The light scattering portions 21 and 22 are formed by engraving a groove having a depth of about 1 mm along a contour of the character by using a razor machine, or as shown in an enlarged view in FIGS. The surface is formed as a convex 25 or a concave shape 26, and furthermore, a fine concave 25a and a convex 25b are formed on this surface.
Light scattering occurs at the boundary portion to emit light. Light emitting diode 3,
The light emission of 3 'was connected to an electric control circuit (not shown) via the lead wire 4, and the light emission state was selected by switching the light emitting diode to light. In the second embodiment configured as described above, the luminous flux emitted by the light emitting diode 3 or 3 'is scattered by the light scattering portion 21 or 22', and characters are raised on the panel surface. Now here first
When the light emitting diode 3 of the light guide emits green light, the green letters "accept" on the panel surface are vividly raised. At this time, since the light emitting diode 3 'of the light guide 1' arranged at the rear of the panel surface is not turned on,
The word "End" is almost transparent, and can be hardly seen from the panel unless carefully considered. When the light emitting diode 3 'of the first light guide 1 is cut off and the light emitting diode 3' of the second light guide 1 'comes into contact, the light emitting diode 3' is turned on, and the luminous flux enters the second light guide. The letters "" are illuminated in bright red, and the letters emerge on the panel. Further, in the figure, the character "END" is shown only on the front surface so as to be visible, but this light emitting state can be visually observed from various directions. In the figure, since the second light scattering portion 5 is formed on the upper surface, a linear glow made by the light emission of the first light guide is obtained in the upper portion of the panel surface together with the letters "accept". Here, in order to avoid complexity, an example in which the transparent optical waveguides 1 and 1 ′ having a two-layer structure are merely used has been described in detail. However, the layer structure is not limited to only two layers, and furthermore, the thickness of the optical waveguide is further reduced. Is suitably used for the purpose. As in the second embodiment, various patterns are drawn so that the light fluxes overlap the first light guide 1 and the second light guide 1 ', and the light emitting diodes 3 and 3' emit light at the same time. The interference diagram of this pattern is drawn as beautiful light emission.

[0014]

Embodiment 3 FIG. 3 is an expanded view of the configuration example of the first embodiment of the transmission type display device according to the present invention. FIG.
FIG. 2 shows a sectional view (a) and a front view (b) as in FIG. Further, FIG. 3C is a bird's-eye view of the cut 11, the light guide 31, and the light emitting diode 3 as another arrangement example. In the drawings, parts having the same functions are numbered with the same numerals. In FIG. 3, reference numeral 1 denotes a square plate-shaped light guide made of a series of transparent or translucent organic or inorganic media such as quartz, glass, epoxy resin, polycarbonate, and acrylic resin. The optical waveguide 13 is divided into 1, 1 'divided by the above and a light guide 13 thicker than that.
Reference numeral 5 denotes a light-scattering part formed of fine irregularities, for example, a grain of sand, which is formed on the upper part of the above-mentioned square plate light guide.
A groove or hole 2 for inserting the light emitting diode 3 was formed in a part of any side surface of the light emitting diode 3. Further, the light emitting diode may be inserted so as to fit into the hole 2, or may be fixed in the hole 2 using an instant adhesive in some cases. Further, in the second embodiment, as shown in the cross-sectional view, a notch 11 is formed in the light guide 1 so as to have a taper substantially parallel to the panel surface. As shown in the sectional view and the surface view of FIGS. 3A and 3B, the light emitting diode 3 is disposed in the hole 2 formed in the light guide 13 and the light emitting diode 3 is disposed.
Is connected to an electric control circuit (not shown) via a lead wire 4 so that the light emitting diode emits light in accordance with a control operation. On the opposite surface of the notch 11, light scattering surfaces 10, 10 'having minute unevenness were formed on both surfaces or one of the surfaces. Also, if necessary, a light scattering portion is provided on the back surface of the light guides 1, 1 '. In the drawing, reference numeral 12 denotes a gap between the decorative frame 7 and the light guide path 1. In this figure, a configuration in which the gap 12 is wide is illustrated. Without providing 12,
The light guide path 1 ′ is arranged so as to be substantially in contact with the decorative frame 7.
In the second embodiment configured as described above, the luminous flux emitted from the light emitting diode 2 first scatters and is refracted by the light scattering portion 8 ′ formed near the light emitting diode 3 in the cut 11, and is refracted. By causing the spread in the width direction, the directivity of light is softened, and the light spreads over the entire panel surface. Then, this light is further scattered by the light scattering portions 10 and 10 ′ constituted by minute concave and convex surfaces of the cut portions, and causes the entire panel surface to emit light. Although not shown, a medium such as a positive film having a pattern formed on a transparent film may be inserted into the cut 11. In addition, the control operation of the light emission state follows the operation function of a telephone, and the functional operation of a liquid crystal panel of an information device or a touch panel.

[0015]

Fourth Embodiment FIG. 4 is a diagram similar to FIGS. 1 and 3 showing a configuration example of a fourth embodiment in which the thickness of the light guide of the transmission type display device according to the present invention is smaller than the diameter of the light emitting diode. They are shown as a sectional view (a) and a front view (b). In the figure, the parts having the same functions already described in detail are numbered by the same numerals. FIG. 4 illustrates one light guide. Reference numeral 5 denotes a light scattering portion formed on the back surface of the above-mentioned square plate light guide, for example, a fine uneven surface formed on the back surface of the light guide, and a light guide 41 for attaching the light emitting diode 3 continuous with the light guide 1. The portion was thicker than the groove or hole 2 for inserting a light emitting diode and thicker than the light guide 1. The light guide 41 is provided on any side surface, and at least one groove or hole 2 for inserting the light emitting diode 3 is formed in a part of the light guide 41. Further, the light emitting diode 3 may be inserted so as to fit into the hole 2, and may be fixed in the hole 2 by using an instant adhesive in some cases. The diode 2 emits light in the manner described in detail in the first and second embodiments, and the light flux is first scattered and refracted by the scattering portion 8 ′ due to the step between the light guide portions 1 and 41, and is refracted and spreads in the width direction of the surface. By producing
The directivity of light is softened, and the light spreads over the entire panel surface 6. Then, this light is further scattered by the light scattering portion 10 formed by the minute uneven surface formed on the light guide portion 1, so that the entire surface of the panel surface 6 emits light. Further, the control operation of the light emission state is an operation mode according to the operation function of a telephone, and is based on the function operation of a liquid crystal panel of an information device or a touch panel.

[0016]

Embodiment 5 FIG. 5 is a modification of the third embodiment of the transmissive display device according to the present invention, and is a sectional view (a) and a front view (b).
This is shown in FIG. Note that, in the same manner as in the above-described embodiment, parts having the same functions are denoted by the same numerals in the drawings. In FIG. 5, the structure and function described in FIG. 4 are omitted, but the portion of the light guide where the light emitting diode 3 is attached is sufficiently thicker than the hole 2 for inserting the light emitting diode and larger than the light guide 1. As shown in the figure, the tapered portion 51 was formed. Further, the diode 2 emits light in the manner described in detail in the first and second embodiments, and the luminous flux is dispersed by the scattering portion 8 ′ of the tapered portion 51 due to the step between the light guides 1 and 51.
First, light is scattered and refracted, and spreads in the width direction of the surface, so that the directivity of light is softened and the light spreads over the entire surface of the panel surface 6. The light emitted from the tapered portion 51 emits light widely like the scattering portion 52 shown by a solid portion in FIG. Then, this light is transmitted to the light scattering portion 10 formed by the minute uneven surface formed on the light guide portion 1.
Causes further scattering, causing the entire panel surface 6 to emit light.
The light guide 1 may be square, fan-shaped, arc-shaped, or polygonal, as long as it is suitable for its use.

[0017]

Embodiment 6 FIG. 6 is a further modification of the fifth embodiment of the transmissive display device according to the present invention, and is a sectional view showing the same. As in the above-described embodiments, parts having the same functions are denoted by the same numerals in the drawings. In FIG. 6, the description of the same configuration and functions as those of FIG. 5 is omitted, but the light guide 51 at the end of the light guide 1 is formed thick. The thick light guide path 51 is provided on the illustrated side surface, and at least one groove or hole 2 for inserting the light emitting diode 3 is formed in a part of the light guide section 51. Further, the light emitting diode 3 may be inserted so as to fit into the hole 2, and may be fixed in the hole 2 by using an instant adhesive in some cases. Further, in the sixth embodiment, the light guide 1
The light emitting efficiency is improved by attaching a reflecting mirror made of metal or the like to the back of the thin portion of the thin film viewed from the viewing surface. Then, the diode 2 emits light in the manner described in detail in the first and second embodiments, and the luminous flux is first scattered and refracted by the scattering portion 8 ′ due to the step between the light guides 1 and 51, and is refracted in the width direction of the surface. The spread of light causes the directivity of light to be softened and light to spread over the entire panel surface. The light is reflected on the surface of the light guide portion 1 and further scattered by the light scattering portion 10 composed of minute uneven surfaces formed on the back surface of the light guide portion 1 viewing surface, so that the entire panel surface emits light. Let it. The light guide 1 may be square, fan-shaped, arc-shaped, polygonal, or of any shape. Further, the control operation of the light emitting state is in accordance with the operation function of the telephone,
If it is a liquid crystal panel of an information device or a touch panel, it follows the functional operation thereof.

[0018]

[Embodiment 7] FIG. 7 shows an example in which the above-described embodiment is applied to a specific case, for example, an evacuation lamp. The symbols in the figure for the same functions already described in FIG. 7 are numbered by the same numerals. In FIG. 7, reference numeral 1 denotes a square plate-shaped light guide, and a material may be selected as needed using a series of transparent or translucent organic or inorganic media such as quartz, glass, epoxy resin, polycarbonate, and acrylic resin. In the trial production, a transparent acrylic resin having a thickness of 1 cm was used. When using such a resin for the light guide path 1, it is preferable to perform an antistatic agent or a UV cut treatment on the surface. Also, if possible, dye using a dye with the same color system or low attenuation as the luminous body, or use a paint or printing ink in which an organic colorant is a coloring material to make a document, background, etc. the front, back, or top surface When printed on the surface of the light guide, the luminous flux running on the light guide surface is less attenuated. In the figure, reference numeral 5 denotes a light scattering portion formed by a fine uneven surface, for example, unevenness such as a grain of sand, formed on the upper part of the above-mentioned square plate light guide. In the seventh embodiment, a person 5 'is shown in the figure. , And a picture or character 5 ″. Further, the light scattering portions 5 'and 5''are constituted by the convex portions 25 or the concave portions 26 already shown in FIGS. 2 (b) and 2 (c).
With the structure 5a, the entire pattern or character emits light. However, the fine irregularities are sharp and sharp, and are strong. . Conversely, if patterns and characters are composed of convex surfaces and fine concave and convex surfaces are formed on other concave surfaces, the background part other than characters and patterns will emit light, and already solid patterns and characters will be printed. By using the above method and combining with the luminescent characters and patterns, a panel surface with a good aesthetic appearance can be constructed. Then, the side surface of the light guide 1 is formed with minute unevenness or the twill portion is chamfered, so that the second scattering portion 73 is formed.
As shown in the figure, a partial emphasis line can also be formed by making the outline part emit light intensely. On the side surface of the light guide 1 in the decorative frame 7, high-intensity light-emitting diodes 3, 3 ′,
Hole 2, 2 ', 2'',2''' for inserting 3 ''
Was configured. High brightness light emitting diode 3, 3 '3'',
3 ″ ″ is coupled to the electric circuit unit 72 and emits light by an operation described later. Further, the light emitting diodes 3 and 3 'may be inserted into the holes 2 so as to fit into the holes 2, and may be fixed in the holes 2 using an instantaneous adhesive in some cases. If the light emitting diode has a high brightness type, an evacuation lamp that emits very strong light can be configured. However, the brightness could be improved when fixed using a cyanoacrylate-based transparent instant adhesive. The present invention can be effectively applied to applications in which a picture or a character in a sign is visually observed from both sides like the evacuation lamp of the seventh embodiment. In other words, in the illustrated evacuation lamp, people and characters can be recognized from both sides. Furthermore, in the case of symmetric characters such as "emergency exit" characters, only the characters or patterns were formed on one of the front and back surfaces, and the same patterns and characters transmitted from the front and back surfaces were correctly read.

FIG. 8 is a diagram showing an operation function of the power supply circuit section of the power supply for the evacuation lamp. Reference numeral 81 denotes a commercial power supply. The voltage of the commercial power supply 81 is 100 V or more. I have. Since the light emitting diode cannot be turned on at such a high voltage, the voltage is reduced to the appropriate voltage of the light emitting diode by the step-down transformer 84 connected to the primary side of the commercial power supply 81. In this figure, two power supply circuits are shown as power supplies for light emitting diodes. In addition, since a DC power supply is required to constantly turn on the light emitting diode, a rectifier circuit 85, 86 composed of a smoothing capacitor and a rectifier (not shown) includes a power transformer 2
The secondary side is electrically coupled and converted to a DC voltage. The DC voltage thus produced is applied to the light emitting diode 3a (blue and green of the high brightness light emitting diode are 3.4V). When the voltage is applied to 3b (red of the high brightness light emitting diode is 2.4 V), the light emitting diode is turned on with a desired brightness. However, in the case of an emergency light, the emergency light must be lit for at least 30 minutes even if the commercial power is turned off.
0 is required. The auxiliary power supply 90 is electrically connected to a commercial power supply disconnection detection circuit 88 in which a well-known power supply voltage detection IC is incorporated. The auxiliary power detection circuit 88
Is also electrically connected to the switching circuit 89 so that the commercial power switching circuit 89 can receive the power supply from the auxiliary power supply 90 while sending a disconnection signal to the DC power switching circuit 89. Reference numeral 82 denotes a fuse, 83 denotes a main switch, and 87 denotes an inspection switch for the auxiliary power supply 90. As described above, the lighting circuit shown in FIG. 8 is configured such that the commercial power supply 81 is normally supplied, the main switch 83 is closed, and the inspection switch 87
Is also in the closed state, the AC voltage stepped down by the step-down transformer is sent to the rectifier circuits 85 and 86. The rectifier circuit 86 sends a power supply voltage suitable for green or blue 3a to the light emitting diode 3a, and the light emitting diode 3a emits light.
Similarly, the light emitting diode 3b that emits light at a low voltage also emits light at the same time. Therefore, the evacuation lamp emits light in a mixed color of red and green. If the evacuation lamp emits only green light, the red light emitting diode 3a is not required. When it is desired to light only the red light emitting diode 3b as a display when the commercial power supply 81 is turned off, the detection state is detected by the detection circuit 88, and the auxiliary power supply 90 is connected via the power supply switching circuit 89. Power is supplied to the 3b light emitting diode. Further, even if the commercial power supply 81 is normal, if the check switch 87 is turned off, the state becomes the same as when the secondary side of the transformer is cut off. If the auxiliary power supply and the circuit are normal, the above-mentioned lighting state should be obtained. However, if there is any abnormality, the diode does not light. As described above, the opening and closing of the inspection switch 87 and the light emitting diodes 3a and 3b
The inspection work is performed by confirming the light emission state of. In the seventh embodiment configured as described above, the light emitting diode 3 always emits light if there is no abnormality in the power supply or the like. The light beam from the light emitting diode is first scattered and refracted by the light scattering section 5, and the light image creates a picture or character on the surface. Then, the light further proceeds straight to reach the second light scattering portion formed at the end of the plate, and causes the side surface to emit light. As described in detail above, in the present invention, the light emitting diode having coherence and the transparent or semi-transparent light guide are efficiently coupled, and the light scattering portion on the light guide uniformly emits light such as a pattern or character. In addition, the present invention provides a transmissive display device that can be used for a liquid crystal backlight used in an information processing device or the like because it can not only obtain a surface light emission but also form a uniform surface light emission.

[0021]

As described above in detail, in the transmission type display device obtained by the present invention, since the optical path is transparent, the transmission type display device has a multilayer structure, and light emitting diodes of different coloring light are arranged in each layer. By superimposing the light emission, patterns of various colors can be easily formed. In addition, even in applications that require confirmation of the light emission state from both the front and back surfaces, such as evacuation lights, not only can the display surface be easily configured with a single light guide, but also display with very little power Since the device can be configured, there is a great power saving effect. Furthermore, since the light is scattered light, a display device that is gentle on the eyes and has good brightness can be obtained. In addition, since a transparent body is used for the light guide, providing a light scattering portion at the center of the surface not only enables the construction of various colors and pictures as if the pictures and characters appeared in the space, but also the light guide The light-transmitting display device is effective in that a light scattering portion is formed on the entire surface of the light guide even if the light guide is thin, so that a backlight used for a lightweight portable device can be obtained.

[Brief description of the drawings]

FIG. 1A is a sectional view of a first embodiment. (B) Front view of the first embodiment.

FIG. 2A is a perspective view of a second embodiment. (B) An example in which minute projections and depressions are formed on the projections. (C) An example in which a concave portion and a fine concave / convex portion are further formed in the concave portion.

FIG. 3A is a sectional view of a third embodiment. (B) Front view of the third embodiment. (C) Bird's-eye view of the cut.

FIG. 4A is a sectional view of a fourth embodiment. (B) Front view of the fourth embodiment.

FIG. 5A is a sectional view of a fifth embodiment. (B) Front view of the fifth embodiment.

FIG. 6 is a sectional view of a sixth embodiment.

FIG. 7A is a sectional view of an evacuation lamp according to a seventh embodiment. (B) Front view of an evacuation lamp according to a seventh embodiment.

FIG. 8 is an electric circuit diagram of the evacuation light.

FIG. 9A is a front view of a first conventional example. (B) Cross-sectional view of a first conventional example.

FIG. 10A is a front view of a second conventional example. (B) Sectional view of a second conventional example.

[Explanation of symbols]

1, 1 ′, 1 ″, 1 ″, 21, 22, 31, 41,
51, 73 Light guide. 2, 2 ', 2''holes. 3, 3 ', 3a, 3b, 97, 97' light emitting diodes. 4 Lead wire of light emitting diode. 5, 8, 10, 10 '31, 41, 51, 73 Light scattering part. 5 ', 5'', 25a, 25b Light scattering part by characters and pictures. 4 Lead wire of diode. 6 Panel surface and display surface. 7 Decorative frame. 8, 8 'Notch light scattering part. 9 LCD panel. 11 Cut. 12 void. 13 Coverlay. 25 recess. 26 convex part. 25 Tapered part. 71 bars. 72 Power supply unit. 78 98 printed circuit board. 81 Commercial power supply. 82 fuses. 83, 87 switches. 84 Step-down transformer. 85, 86 Rectifier circuit. 88 Detector. 89 Switching unit. 90 Auxiliary power supply. 91 Fluorescent light. 92 Display unit. 94, 99 reflective frame. 96 Light shield. A Luminous flux. B Light overlapping part. EL Electroluminescence. IC integrated circuit. UV Ultraviolet light. LED light emitting diode.

Claims (6)

[Claims] 1. A power supply for emitting light from a light emitting diode, and at least one transparent or translucent flat light guide on which at least one light emitting diode is mounted, and a surface of the light guide. Alternatively, a uniform light emitting surface is formed by forming a light scattering portion with a minute uneven surface on one portion or the entire surface of the back surface, and a written image of a portion corresponding to the surface of the light emitting surface can be visually recognized as a transmission image. A transmissive display device characterized by the following. 2. A light emitting diode at an end of the light guide, comprising a power supply unit for causing the light emitting diode to emit light, at least one light emitting diode, and at least one transparent or translucent flat light guide. The mounting portion is slightly thicker than the flat plate to form a mounting hole for the light emitting diode, and the light emitting diode is inserted into the hole, and forms a light scattering portion on the front or back surface of the light guide. A transmissive display device characterized in that the light scattering portion is formed of a transparent or translucent writing screen, emits light in a planar or linear manner, and is visible in the dark. 3. The transmissive display device according to claim 1, wherein at least one or more flat light guides are provided, and cutout portions are formed in the flat plate in parallel with a plane direction. 4. The transmission type display device according to claim 1, wherein the light scattering portion has a grain pattern. 5. A light-scattering section comprising a plurality of independent laminated multi-plates, each of which is provided with a light-emitting diode, so that the light-emitting diodes can emit light individually or at once. The transmission type display device according to claim 1. 6. A flat light guide comprising at least two or more flat light guides, each of which is provided with a light emitting diode having a different emission color, and wherein a light buffer image is formed between the flat light guides. 6. The transmission display device according to any one of claims 1, 2, and 5.