JP2001229723A - Plane light-emitting display device and method of assembling it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plane light-emitting display device that has enhanced light-emitting efficiency, uniform display brightness, and enhanced visual effect by using minimum number of LED light sources. SOLUTION: This device comprises an LED light source 1, light transmission plate 4 having a light incident surface 4a for receiving the light of the LED light source 1 and a light-emitting surface 4b for emitting the received light, a reflector 5 for enclosing at least a surface of the light transmission plate 4 except the light incident surface 4a and light-emitting surface 4b, and a display plate 7 mounted over the front surface of the light-emitting surface 4b of the light transmission plate 4 to display a desired pattern by transmitting the light from the light-emitting surface 4b through the entire region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-emitting display device using an LED light source and a method for assembling the same.

[0002]

2. Description of the Related Art FIG.
FIG. 1A is a configuration diagram of a conventional surface-emitting display device disclosed in Japanese Patent Application Publication No. 2 (1993) -207, in which FIG. 1A is a partial plan view of the same device, and FIG. Things. FIG. 21 is a diagram showing a light propagation state in the device.

In FIG. 1, reference numeral 1 denotes an LED light source; 14, a light guide plate made of a material having high translucency, such as acrylic resin; 9, an LED fixing holder fitted to an end of the light guide plate 14;
Denotes a pattern filter affixed on the surface of the light guide plate 14;
1 is a light emitting layer, and 12 is a frame provided on the peripheral surface of the light guide plate 14.

[0004] The light emitting layer 11 is formed of a dod pattern provided in a pattern display area X set substantially at the center of the light guide plate surface as shown in FIG.
Each dot portion 11a is made of a paint that scatters and reflects light, and the light hitting the dot portion 11a is scattered and reflected here and returned into the light guide plate 14, and some light enters the surface at a small incident angle. Then it is radiated to the outside. The dot pattern of the light emitting layer 11 is configured to be smaller near the LED light source 1 and larger as the distance from the LED light source 1 is increased so that the overall light amount on the surface of the light emitting layer 11 is substantially constant.

Reference numeral 13 denotes an LE for mounting the LED light source 1.
A plurality of LED light sources 1 are arranged along one side of the light guide plate 14. LED fixing holder 9 and LED
The inner surfaces 9a and 13a of the substrate 13 are coated with white paint metal plating or the like. The pattern filter 10 is made of a transparent plate material or a film-like member, and has a pattern such as a character and a design drawn on a surface thereof. The character and the design part are configured to transmit light. Are configured to reflect light.

Note that, on the surface of the light guide plate 14, FIG.
As shown in FIG. 0 (a), a pattern display area X is set in the center, and a light emitting layer 11 is provided here, and the other peripheral part Y is configured to specularly reflect light.

FIG. 2 shows the operation of light when the LED light source 1 is turned on in the surface-emitting display device configured as described above.
1 will be described. The light of the LED light source 1 is reflected in the LED light source fixing holder 9 and propagates toward the light guide plate 14. The light travels on the light guide plate 14 while being specularly reflected between the front and back wall surfaces.
1a, the light is scattered and reflected and emitted from the pattern filter 10 to the outside. In the radiating portion of the pattern filter 10, if the pattern is a character or design portion (light transmitting region), the light is radiated to the outside as it is, but if the pattern is a portion around the character or design portion (light reflecting region), the light is Is reflected by this surrounding part and returns. As described above, the character and design patterns of the pattern filter 10 emerge on the surface of the surface light emitting display device. At this time, the dot pattern of the light emitting layer 11 is configured such that the light reflectance increases as the LED pattern 1 approaches the LED light source 1. The letters and designs that emerge because of the overall brightness are almost the same.

[0008]

In the conventional surface-emitting display device as described above, since there is no reflector for covering the light guide plate 14,
Of the light reflected by the dot portions 11a of the light emitting layer 11, the characters of the pattern filter 10 on the surface and the light traveling toward the design portion can be emitted to the surface.
Light traveling toward the reflection area in the peripheral portion of the design part is reflected by the reflection area, and light loss due to the reflectance occurs. Also, of the light reflected by the reflection area, the dot portion 11a
There is also a problem that light utilization efficiency is low because some light is emitted to the back and goes to the back.

Even if the light emitting layer 11 is provided on the entire surface of the light guide plate 14, the light emitting layer 11 is scattered and reflected by the light emitting layer 11 on the light emitting surface because the light emitting center direction of the LED light source 1 is parallel to the light emitting layer 11. There is a problem that the amount of emitted light is limited and the brightness of the light tends to be uneven. In addition, since the pattern filter 10 has a reflective portion, there is a portion that shines on the display panel and a portion that does not shine, so that it is difficult to see as a whole, and the visibility of the display itself is insufficient. Further, in order to make the display surface bright, it is necessary to use many high-power LED light sources 1 which are expensive. In addition, due to tolerances in processing and assembling, individual light guide plates 14
There was a problem that the entire light source 1 could not be brought into contact and the incident efficiency was low. In addition, when the device using the LED light source 1 and the surface-emitting display device using the fluorescent lamp coexist, there is a problem that the sense of unity of colors is disturbed. Further, it has not been easy to improve the front luminance while securing an appropriate luminance even from an oblique direction. In addition, the assembly of the surface-emitting display device was completed after the reflective member and the light guide plate were attached to the case, and then the display plate was adhered to the case. There was a problem that a defect was discovered just before.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a high display efficiency and a high display efficiency in which light from an LED light source enters the light guide plate and exits from the light guide plate with high efficiency. Evenness, high visibility,
It is possible to obtain a surface-emitting display device with good workability and a method of assembling the same, in which the colors of other light sources can be unified, the front luminance can be improved, the number of LED light sources used can be minimized, and the workability is good. The purpose is to:

[0011]

A surface-emitting display device according to the present invention is a light guide plate having an LED light source, an incident surface on which the light of the LED light is incident, and an exit surface on which the incident light is propagated and emitted. A reflecting member provided so as to cover at least one or more surfaces of the light guide plate other than the incident surface and the output surface; and a reflection member provided on a front surface of the light output surface of the light guide plate, A display plate for transmitting an emitted light in all regions and displaying an arbitrary pattern.

The light guide plate has a wedge shape in which the thickness is reduced in the light guide direction from the incident surface to the opposite surface of the incident surface.

Further, a scattering surface is provided on at least one of the light emitting surface and the light emitting surface facing the light emitting plate, and the light scattering plate is a fine rough surface.

The light guide plate is provided on at least one of the exit surface or the opposite surface of the exit surface, and a rough surface having a pattern in which fine irregularities on the surface gradually become deeper as the distance from the entrance surface increases; And a smooth surface that does not scatter light.

The LED light source is a white LED light source,
The display plate has an area for attenuating the blue component of the light from the white LED light source.

Further, a color adjusting filter for attenuating the light intensity of a predetermined color component is provided between the LED light source and the incident surface of the light guide plate.

The color adjusting filter is provided between the light emitting surface of the light guide plate and the display plate.

In addition, a reflector is provided which surrounds the LED light source and guides the light from the LED light source in a specific direction, and the surface of the reflector is a scattering reflection surface.

Further, at least one light condensing sheet for condensing and emitting light from the light guide plate is provided between the light guide plate and the display plate.

The light emitting portion of the LED light source is brought into contact with the light guide plate incident surface.

Further, there is provided means for bringing the light emitting portion of the LED light source into contact with the light guide plate incident surface.

Further, the means for bringing the light emitting portion of the LED light source into contact with the light guide plate incident surface is provided by an LE holding the LED substrate.
One end is integrally formed in the D substrate holder, and the other end is a leaf spring for urging the LED substrate in the direction of the light guide plate incident surface.

In addition, LED light sources having different light outputs are provided corresponding to regions of the display panel having different transmittances.

An LED light source having a high light output is provided in a region having a high transmittance.

An LED light source having a low light output is provided in a region having a high transmittance.

[0026] Further, a frame-shaped case having an open front and back is provided, and a back plate for holding the light guide plate is provided on the back side of the case.

Further, the back side of the reflector for guiding the light from the LED light source in a specific direction is extended so as to hold the light guide plate, and the reflector and the back plate are integrated.

The method for assembling a surface-emitting display device according to the present invention is the method for assembling a surface-emitting display device according to claim 16, wherein the light guide plate and the reflecting member are placed in the case after the display plate is fixed to the front side of the case. Then, the back plate is fixed to the back side of the case.

[0029]

Embodiments of the present invention will be described below.

Embodiment 1 1 is a cross-sectional view of a surface-emitting display device according to Embodiment 1, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a diagram showing a light propagation state of a main part of the device. FIG.
In the figure, reference numeral 1 denotes an LED light source, which has a shape such as a bullet type or a chip type, and an arbitrary color such as white, blue, green, or red is used as a luminescent color. 2 is the LE on which the LED light source 1 is mounted
D substrate, 3 is a reflector that is a reflecting member that surrounds the LED light source 1 and guides the light from the LED light source 1 in a specific direction,
The surface of the reflector 3 is a scattering reflection surface such as a white PET resin or a high reflection polycarbonate resin.

A light guide plate 4 is made of a material having high translucency such as an acrylic resin, and allows light from the LED light source 1 to enter from the incident surface 4a, propagate along the surface, and exit from the exit surface 4b as a surface light source. The emission surface 4b has a rectangular shape, and one side surface is the incidence surface 4a. Then, the thickness is reduced in the light guide direction from the incident surface 4a to the opposing surface 4c of the incident surface 4a, and the rear surface 4d opposed to the emission surface 4b has a slanted wedge shape.

Reference numeral 5 denotes a scattering surface which is provided on the back surface 4d opposite to the emission surface 4b and scatters light from the LED light source 1, and 6 denotes at least one or more surfaces other than the incidence surface 4a and the emission surface 4b. It is a reflecting member made of a white PET sheet or the like that covers the surface, and in the present embodiment, the back surface 4d and the incident surface 4a
The surface other than the opposing surface 4c is not covered. Reference numeral 7 denotes a display plate which is provided on the front surface of the light exit surface 4b of the light guide plate 4, transmits the light exiting from the light exit surface 4b in the entire area, and displays an arbitrary pattern.
Is the case. In FIG. 1, the scattering surface 5 is the emission surface 4b.
Is provided on the back surface 4d opposed to the light emitting surface 4b.
Alternatively, a scattering surface may be provided on at least one of the emission surface 4b and the back surface 4d, and the scattering surface may be a fine rough surface.

Next, the operation of the embodiment will be described with reference to FIGS.
This will be described below. FIG. 3A shows a case of a conventional flat light guide plate, and FIG. 3B shows a case of a wedge type light guide plate of the present invention. As shown in FIG. 1, the light from the LED light source 1 is
The light including the light reflected by the reflector 3 enters the light guide plate 4 from the incident surface 4a of the light guide plate 4, and the incident light is emitted from the exit surface 4b.
It travels while scattering and reflecting between the light and the scattering surface 5 or the reflecting member 6.

The light r1 is totally reflected by the light exit surface 4b, then scattered and reflected by the scattering surface 5 or the reflecting member 6, and is incident on the light exit surface 4b at an angle smaller than the critical angle of total reflection. From the display panel 7 to be displayed through the display plate 7. At this time, a part of the light scattered and reflected is totally reflected again on the emission surface 4b, and scattered and reflected again on the scattering surface 5 or the reflecting member 6. As described above, the light emitted from the emission surface 4b sequentially illuminates the display panel while displaying the display while repeating the scattered reflection on the emission surface 4b and the scattering surface 5 or the reflection member 6. The light r2 is first scattered and reflected by the scattering surface 5 or the reflecting member 6, exits from the exit surface 4b, passes through the display plate 7, and raises an object to be displayed. At this time, a part of the light scattered and reflected is again reflected on the emission surface 4b, and the light is reflected on the emission surface 4b while repeating the reflection on the emission surface 4b and the scattered reflection on the scattering surface 5 or the reflection member 6 similarly to the light r1.
Are sequentially illuminated on the display panel for display.

As shown in FIG. 2, when the light r2 is incident on the scattering surface, the light r3 is scattered and reflected by the scattering surface 5, and the light is scattered and transmitted by the scattering surface 5, as shown in FIG. A light r4 exiting from the light guide plate 4 toward the reflection member 6,
There is light r5 scattered and reflected by the reflecting member 6 and returned to the light guide plate 4 again. In addition, the light scattered and reflected by the scattering surface 5 includes light that is guided through the light guide plate 4 and light that is directly emitted toward the emission surface 4b. A scattering surface is provided on at least one of the back surface 4d and the emission surface 4b, and the scattering surface is formed into a fine rough surface. The rough surface is formed as a transfer surface of a blasted mold surface, and a transmittance is obtained. And the reflectance can be increased. The scattering surface may be formed by printing, but in the case of printing, the reflection loss is large, and there is a limit to making the printed pattern fine, but when the scattering surface is formed by transferring the mold surface, The reflection loss is small, the surface can be made fine and rough, the dots are inconspicuous, and the printing process can be omitted.

Further, since the surface of the reflector 3 is made of a scattering reflection surface such as white PET resin or high reflection polycarbonate resin, the brightness (brightness) of the surface of the display panel 7 is about 5% as compared with the case of high reflection aluminum. Up.

Next, the propagation state of light between the conventional flat light guide plate and the wedge light guide plate of the present invention will be described with reference to FIG. In the case of the wedge-type light guide plate shown in FIG.
Since the back surface 4d facing b is inclined, the reflection angle of the back surface 4d becomes smaller than that of the conventional flat light guide plate of FIG.
The number of reflections in the light guide plate is large. Therefore, in the wedge-type light guide plate as in the present invention, the number of times of total reflection in the light guide plate 4 is large, and the angle of incidence of the light incident on the emission surface 4b becomes smaller during the light guide, and the light scattered and reflected becomes smaller. The light emitted from the light exit surface 4b and emitted from the light exit surface 4b increases, and the light emission efficiency is high. Therefore, the display panel is displayed bright and uneven on the whole.

As described above, the light guide plate 4 that receives the light from the LED light source 1 and emits the incident light,
Since the reflecting member 6 is provided on at least one surface other than the incident surface 4a and the outgoing surface 4b, the display surface has no uneven brightness, high visibility, and low power consumption. In addition, since the light guide plate 4 is formed in a wedge shape having a small thickness in the light guide direction from the incident surface 4a to the opposite surface of the incident surface 4a, the emission efficiency can be increased. In addition, the light guide plate 4
The light emitting surface 4a or at least one of the opposing surfaces of the light emitting surface 4a is provided with a scattering surface, and this scattering surface is a fine rough surface, so that the transmittance and the reflectance can be increased, and the dots become inconspicuous. In addition, the printing step can be omitted. Further, since the surface of the reflector 3 is a scattering reflection surface such as a white PET resin or a high reflection polycarbonate resin, the brightness of the surface of the display panel 7 can be improved.

Embodiment 2 This embodiment shows a guide light using the surface-emitting display device shown in Embodiment 1, and FIGS. 4 and 5 are partially cutaway plan views of the guide light showing Embodiment 2. FIG. FIG. 1 showing Embodiment 1 in the drawing.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted. 1a is a bright high output LED light source, 1b is a dark low output LED
The light source A is a white region of the display panel 7 where the transmittance is high,
B is a green area having a low transmittance.

The high-power LED light source 1a is arranged in a white area A having a high transmittance of the display panel 7, and the low-output LED light source 1b is arranged in a green area B having a low transmittance. Therefore, the area A having a high transmittance becomes brighter, and the brightness of the entire display surface increases.

As described above, a high-cost high-power LED
By minimizing the number of light sources 1a used, it is possible to obtain sufficient brightness and make it stand out.

Embodiment 3 In the second embodiment, a bright LED light source with a high output is placed in a white area of the display panel with a high transmittance, and a dark LED with a low output in a green area B with a low transmittance.
In this embodiment, conversely, a low-output LED light source is provided in a white region of the display panel having a high transmittance, and a high-output LED light source is provided in a green region of a low transmittance. It is arranged. FIG. 6 is a partially broken plan view of the guide light showing the third embodiment. In the figure, the same parts as those of the second embodiment shown in FIG.

As shown in FIG. 6, a low-power LED light source 1b is provided in a white area A having a high transmittance of the display panel 7, and a high-power LED light source 1b is provided in a green area B having a low transmittance. I have. Therefore, the brightness of the high transmittance area A and the low transmittance green area B becomes uniform.

As described above, a high-cost LED with high cost
By minimizing the number of light sources 1a used, sufficient uniformity can be obtained, and the light source 1a can be easily viewed.

Embodiment 4 This embodiment has both the second and third embodiments, and FIG. 7 is a partially cutaway plan view of the guide light according to the fourth embodiment. In the figure, the same parts as those in FIG. 1 showing the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, on the display panel 7a in the left half of the figure, as in the second embodiment, a bright high-output LED light source 1a is placed in a region A where characters and arrows have a high transmittance, and a background transmittance that is not a character is transmitted. Dark low-output LED light sources are arranged in a low-area B, and a low-output LED is provided in a high-transmittance area A of a background other than a character or an arrow on the display panel 7b in the right half of the figure as in the third embodiment. As the light source, a high-output LED light source is disposed in a region B having a low transmittance in a character or arrow portion.
Therefore, the display becomes uniform and bright as a whole. In the figure, two high-power LED light sources 1a are used in the character portion, but the high-power LED light sources according to the number and size of the characters are used.
This is the number of light sources 1a.

As described above, a high-cost high-power LED
By keeping the number of light sources 1a used to a minimum, it is possible to obtain a sufficiently uniform brightness as a whole and to make it easier to see. Further, it is possible to easily use the LED light sources 1a and 1b having different outputs in detail according to display contents.

Embodiment 5 FIG. FIG. 8 is a cross-sectional view and a plan view of a surface-emitting display device according to a fifth embodiment, and FIG. 9 is a diagram illustrating a relationship between a change in depth of a rough surface depending on a distance from an incident surface side and luminance of an emission surface. 1 and 2 showing the first embodiment in FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted. Reference numeral 21 denotes a rough surface having a pattern provided on the back surface 4d opposite to the light exit surface 4b of the light guide plate 4, and having a pattern in which fine irregularities on the surface gradually become deeper as the distance from the incident surface increases, and 22 denotes a light incident surface 4a of the light guide plate 4. It is a smooth surface that is provided on the side and does not scatter light.
W and H are the horizontal and vertical ranges of the display surface area, and C is a portion S which is a shadow without light sneaking in due to the directivity of the LED light source 1.
Is the range from the incident surface. In FIG. 8, the rough surface 2
1 and the smooth surface 22 are provided on the back surface 4d facing the emission surface 4b, but the emission surface 4b and the back surface 4d facing the emission surface 4b are provided.
, Or only on the emission surface 4b.

In this configuration, the relationship between the change in the uneven depth of the rough surface 21 depending on the distance from the incident surface 4a side and the luminance of the emission surface 4b will be described with reference to FIG. FIG. 9A shows a change in luminance of the emission surface 4b when the roughness of the rough surface 21 is constant.
(B) shows a change in luminance in the case of a gradation pattern in which the roughness depth of the rough surface 21 according to the present embodiment gradually increases as the distance from the incident surface 4a increases. As shown in FIG. 9A, in the case where the roughness depth (dotted line) of the rough surface 21 is constant, as the distance from the entrance surface 4a increases, the luminance (solid line) of the exit surface 4b decreases, and the luminance becomes uniform. Not. On the other hand, FIG.
As shown in (b), in the case of a gradation pattern (dotted line) in which the fine irregularities on the surface gradually become deeper as the depth (dotted line) of the rough surface 21 becomes farther from the incident surface 4a, the incident surface 4
The luminance (solid line) is constant even when the distance from a increases.

Also, C from the incident surface including the shadow portion S
Area cannot be used as a display surface because of uneven brightness. Therefore, when light is emitted to the outside at this portion, a loss occurs. However, by making the area of C from the incident surface a smooth surface 22, the light is totally reflected without being scattered on this surface, and the light is reflected in the direction of the display surface area. The display surface is brightened without causing any loss due to light guiding.

As described above, the back surface 4d of the light guide plate 4 is provided with the rough surface 21 in which the fine irregularities gradually become deeper as the distance from the incident surface increases, and the smooth surface 22 which does not scatter light on the incident surface 4a side. The brightness of the emission surface can be made uniform.
Further, the display surface can be made bright.

Embodiment 6 FIG. This embodiment shows a guide light using the surface-emitting display device described in Embodiment 1, and FIG. 10 shows a guide light according to Embodiment 6. In the figure, 1C is a white LED light source, 7 is a display plate, and 8 is a case. The display plate 7 is a plate made of a milky half-color or a transparent material such as an acrylic resin or a polycarbonate resin having high translucency, and may have a matte surface. A is a white area of the display panel 7, and B is a green area. The green area B is printed with green ink, or
The green ink was formed by attaching the green seal, and the transmittance of light of the blue component of the green ink and the green seal was reduced.

Conventionally, when the white LED light source 1C is used, since the light of the white LED light source 1C has a large blue component, the green area B is bluish green (xy chromaticity coordinates (x, y) = (0.1
7, 0.34)), but by performing the above, the green region B becomes green instead of bluish green even when light having a large amount of blue component specific to the white LED light source 1C passes through. ((X,
y) = (0.24, 0.51)). The white area A is adjusted by the color of the white LED light source 1C itself. In addition, white LED
In the light source 1C, light emitted from the LED elements in the white LED light source 1C is generally blue light, and the blue light causes the phosphor disposed in the white LED light source 1C to emit yellow light. The yellow light by the phosphor and the blue light emitted by the LED element are combined into white light, but the white light of the white LED light source 1C has a large blue component at present.

As described above, since the region having the blue component of the light from the white LED light source is attenuated, the green region B can be prevented from becoming blue-green, and the white LE can be prevented.
Even if the surface-emitting display device equipped with the D light source 1C and the surface-emitting display device equipped with the fluorescent lamp light source coexist, it is possible to prevent the unification of colors from being disturbed.

Embodiment 7 FIG. FIG. 11 shows a guide light according to the fourth embodiment. FIG. 10 showing Embodiment 6 in the drawing.
The same parts as those in FIG. 1 is L
The ED light source 23 is a color adjustment filter between the LED light source 1 and the incident surface of the light guide plate 4 for attenuating a part of the blue light to make the same light as the fluorescent lamp. As described above, since the light can be converted into light of the same color as the fluorescent lamp, it is possible to prevent the green area B from becoming bluish green. Further, the color adjustment filter may be provided between the emission surface of the light guide plate 4 and the display plate.

As described above, the color adjustment for attenuating a part of the blue light between the white LED light source 1C and the entrance surface 4a of the light guide plate 4 or between the exit surface of the light guide plate 4 and the display plate. Since the filter 23 is provided, it is possible to prevent the green region B from becoming bluish green, and even if the surface emitting display device equipped with the white LED light source 1C and the surface emitting display device equipped with the fluorescent lamp light source coexist. It is possible not to disturb the sense of unity of colors. In this embodiment, the case of a white LED light source has been described, but a general LED light source may use a color adjustment filter that attenuates the light intensity of a specific color component.

Embodiment 8 FIG. FIG. 12 is a sectional view of a surface-emitting display device according to the eighth embodiment. In the figure, the same parts as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 25 denotes a light condensing sheet that condenses and emits light from the light guide plate 4 between the light guide plate 4 and the display plate 7. The light-condensing sheet 25 uses a diffusion sheet, a prism sheet, or the like, and uses one or more sheets.

FIG. 13 shows the relationship between the angular distribution of the luminance of the display surface of the display panel 7 when the diffusion sheet is used as the light-condensing sheet 25 and when it is not used, where 0 degrees indicates the front direction. As shown in the figure, when the light-collecting sheet 25 is not used, the front luminance is low, but the light using the light-collecting sheet 25 can increase the front luminance without significantly lowering the luminance in the oblique direction. In this case, the front luminance is 1.3 to 1.4 times that when the light-collecting sheet 25 is not used. The prism sheet is used for a special purpose because of its high light-collecting ratio.

As described above, since the condensing sheet is provided between the light guide plate 4 and the display plate 7, it is possible to improve the front luminance while securing a proper luminance even from an oblique direction.

Embodiment 9 FIG. 14 is a partial sectional view of the surface-emitting display device according to the sixth embodiment. In the figure, the same parts as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 35 denotes an LED substrate holder for housing the LED substrate 2, and reference numeral 26 denotes a light emitting portion of the LED light source 1.
Is a leaf spring to be brought into contact with the incident surface 4a. The leaf spring is 26
Has one end integrally formed in the LED substrate holder 35 and the other end for urging the LED substrate 2 in the direction of the light guide plate incident surface 4a, and is provided at two locations on the left and right. And LE
When the D-board holder 35 is set at a predetermined position, the LED
The light emitting portion of the light source 1 is brought into contact with the incident surface 4a of the light guide plate 4 and the LED substrate 2 is pressed by the plate spring 26 to make uniform contact.

As described above, conventionally, the LED light source 1
Although it was not easy to bring the light emitting portion of the LED light source 4 into uniform contact with the incident surface 4a of the light guide plate 4, the light emitting portion of the LED light source 1 was formed by the plate spring 26 having one end integrally formed in the LED substrate holder 35. Is uniformly contacted with the incident surface 4a of the light guide plate 4, so that the incidence rate from the LED light source 1 to the light guide plate 4 can be improved. In addition, it is possible to prevent a variation in incidence efficiency due to a variation in manufacturing.

Embodiment 10 FIG. FIG. 15 shows Embodiment 10
FIG. 16 is a longitudinal sectional view of the surface-emitting display device,
FIG. 17 is an assembly view of a surface-emitting display device, FIG. 18 is a longitudinal sectional view of the surface-emitting display device, and FIG. 19 is a cross-sectional view of a conventional surface-emitting display device. In the figure, the same portions as those in FIG. 1 showing the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 15, 1
6, reference numeral 31 denotes a frame-shaped case having open front and back sides;
Are a back plate for holding the light guide plate provided on the back side of the case 31;
3 is an adhesive.

The assembling of the surface-emitting display device having this structure will be described with reference to FIG. First, the display panel 7 is bonded to the front side of the case 31 with the adhesive 33. Next, the light collecting sheet 25, the light guide plate 4, and the reflecting member 6 are mounted in this order from the back side of the display plate 7,
Finally, the back plate 32 is fixed to the back side of the case 31. Conventionally, as shown in FIG. 19, a case 34 with a bottom is provided. In this case 34, the reflection member 6, the light guide plate 4, and the light collecting sheet 25 are mounted in this order, and finally, the display plate 7 is attached to the case 34 with an adhesive 33.
Was adhered to. Therefore, the adhesive 34 is
5, it was not easy to prevent the light from flowing into the light guide plate 4, the reflection member and the like. In the assembly of the surface-emitting display device of the present embodiment, the adhesive 34 does not flow to the light-collecting sheet 25, the light guide plate 4, the reflection member, and the like, so that the assembly can be facilitated.

Note that, as shown in FIG.
The back side of the reflector 3 that guides light from a specific direction may be extended to hold the light guide plate, and the reflector 3 and the back plate may be integrated into a back plate / reflector 36. By doing so, Alternatively, the reflection member 6 may be omitted.

[0065]

As described above, according to the present invention, the LE
A D light source, a light guide plate having an incident surface on which light of the LED light source is incident, and an exit surface from which the incident light is propagated and emitted, and at least one or more of the light guide plate other than the incident surface and the exit surface A reflecting member provided to cover the surface of
A display plate that is provided on the front surface of the light exit surface of the light guide plate and transmits the light emitted from the light exit surface in the entire region and displays an arbitrary pattern. There is no unevenness and visibility can be improved.

Further, since the light guide plate has a wedge shape in which the thickness is reduced in the light guide direction from the incident surface to the opposite surface of the incident surface, the emission efficiency can be further increased.

In addition, a scattering surface is provided on at least one of the light-emitting surface and the light-emitting surface of the light guide plate, and the light-scattering surface is a fine rough surface, so that the transmittance and the reflectance can be increased. .

The light guide plate is provided on at least one of the exit surface and the opposite surface of the exit surface, and the light guide plate has a rough surface having a pattern in which the fine irregularities gradually become deeper as the distance from the entrance surface increases. Since it is provided with a smooth surface that does not scatter light, it is possible to make the luminance of emitted light uniform.

The LED light source is a white LED light source,
Since the display panel has an area for attenuating the blue component of the light from the white LED light source, the green area B can be prevented from becoming bluish green, and the surface light emitting display equipped with the white LED light source can be prevented. Even if the device and the surface-emitting display device equipped with the fluorescent lamp light source are mixed, it is possible to prevent the unification of colors from being disturbed.

Further, since a color adjusting filter for attenuating the light intensity of a predetermined color component is provided between the LED light source and the incident surface of the light guide plate, the green area B is prevented from becoming blue-green. Therefore, even if a surface-emitting display device equipped with a white LED light source and a surface-emitting display device equipped with a fluorescent lamp light source are mixed, the unification of colors can be prevented.

Further, since the color adjusting filter is provided between the light emitting surface of the light guide plate and the display plate, the green region B can be prevented from becoming bluish green, and the surface light emitting device having the white LED light source is mounted. Even when a display device and a surface-emitting display device equipped with a fluorescent lamp light source are mixed, it is possible to prevent the unification of colors from being disturbed.

Further, since a reflector surrounding the LED light source and guiding the light from the LED light source in a specific direction is provided, and the surface of the reflector is a scattering reflection surface, the brightness of the display surface of the display panel can be improved. .

Further, since at least one condensing sheet for condensing and emitting light from the light guide plate is provided between the light guide plate and the display plate, a proper brightness can be ensured even from an oblique direction. Brightness can be improved.

Further, since the light emitting portion of the LED light source is brought into contact with the light guide plate incident surface, the efficiency of incidence from the LED light source to the light guide plate can be improved. Can be prevented.

Further, since means for bringing the light emitting portion of the LED light source into contact with the light guide plate incident surface is provided, the efficiency of incidence from the LED light source to the light guide plate can be improved. Can be prevented.

The means for bringing the light emitting portion of the LED light source into contact with the light guide plate incident surface is provided by an LE holding the LED substrate.
One end is integrally formed in the D substrate holder, and the other end is a leaf spring for urging the LED substrate in the direction of the light guide plate incident surface, so that the efficiency of incidence from the LED light source to the light guide plate can be improved. In addition, it is possible to prevent a variation in incidence efficiency due to a variation in manufacturing.

Further, since the LED light sources having different light outputs are provided corresponding to the regions of the display panel having different transmittances, the number of high-power LED light sources which are expensive can be minimized.
It is possible to obtain a sufficiently uniform brightness as a whole and to make it easy to see.

Further, since an LED light source having a high light output is provided in a region having a high transmittance, a high-power LED having a high cost is provided.
By using a minimum number of light sources, it is possible to obtain sufficient brightness and make it stand out.

Further, since an LED light source having a low light output is disposed in a region having a high transmittance, a high-power LED having a high cost is provided.
By minimizing the number of light sources used, it is possible to obtain sufficient uniformity and make it easier to see.

Further, since a frame-shaped case with open front and back sides and a back plate for holding the light guide plate on the back side of the case are provided, assembly can be facilitated.

Further, since the back side of the reflector for guiding the light from the LED light source in a specific direction is extended to hold the light guide plate, and the reflector and the back plate are integrated, the number of parts can be reduced. Also, assembly can be facilitated.

In the method of assembling a surface-emitting display device according to claim 16, after the display plate is fixed to the front side of the case, the light guide plate and the reflection member are mounted in the case.
Next, since the back plate is fixed to the back side of the case, assembly can be facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a surface-emitting display device according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a diagram illustrating a light propagation state of the surface-emitting display device of FIG. 1;

FIG. 4 is a partially broken plan view of a surface-emitting display device according to a second embodiment of the present invention.

FIG. 5 is a partially broken plan view of a surface-emitting display device according to a second embodiment of the present invention.

FIG. 6 is a partially broken plan view of a surface-emitting display device according to a third embodiment of the present invention.

FIG. 7 is a partially broken plan view of a surface-emitting display device according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view and a plan view of a surface-emitting display device according to a fifth embodiment of the present invention.

FIG. 9 is a diagram illustrating a relationship between a change in the depth of the unevenness of the rough surface depending on the distance from the incident surface and the luminance of the emission surface.

FIG. 10 is a partially broken front view of a guide light according to a sixth embodiment of the present invention.

FIG. 11 is a partially broken front view of a guide light according to a seventh embodiment of the present invention.

FIG. 12 is a sectional view of a surface-emitting display device according to an eighth embodiment of the present invention.

FIG. 13 is a relational diagram of an angular distribution of display surface luminance of a display panel when a light-collecting sheet is used as a diffusion sheet and when a light-scattering sheet is not used.

FIG. 14 is a partial sectional view of a surface-emitting display device according to a ninth embodiment of the present invention.

FIG. 15 is a longitudinal sectional view of a surface-emitting display device according to a tenth embodiment of the present invention.

FIG. 16 is a transverse sectional view of a surface-emitting display device according to a tenth embodiment of the present invention.

FIG. 17 is an assembly explanatory view of a surface-emitting display device according to a tenth embodiment of the present invention.

FIG. 18 is a longitudinal sectional view of a surface-emitting display device according to a tenth embodiment of the present invention.

FIG. 19 is a cross-sectional view of a conventional surface-emitting display device.

FIG. 20 is a configuration diagram of a conventional surface-emitting display device.

21 is a diagram showing a light propagation state of the surface-emitting display device of FIG.

[Explanation of symbols]

1 LED light source, 1a high output LED light source, 1b low output LED light source, 1C white LED light source, 2 LED board,
Reference Signs List 3 reflector, 4 light guide plate, 5 scattering surface, 6 reflecting member, 7 display plate, 8 case, 21 rough surface, 22 smooth surface, 23 color adjustment filter, 25 light collecting sheet, 26
Leaf spring, 31 frame-shaped case, 32 back plate, 35 LE
D board holder, 36 Back plate combined reflector.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F21V 8/00 601 F21V 8/00 601G G02B 6/00 G02B 6/00 D 331 331 G09F 13/18 G09F 13 / 18 D // F21Y 101: 02 F21Y 101: 02 (72) Inventor Hitoshi Ishikawa 2--14-40 Ofuna, Kamakura City, Kanagawa Prefecture Inside Mitsubishi Electric Lighting Corporation (72) Inventor Yoshihito Iseki Ofuna, Kamakura City, Kanagawa Prefecture 2-chome No.14-40 Mitsubishi Electric Lighting Co., Ltd. F-term (reference) 2H038 AA41 AA55 BA06 5C096 AA03 AA21 AA22 BA01 BB23 BC11 CB03 CC06 CD02 CE06 CF06 CG16 CH01 DA01 FA03

Claims (18)

[Claims] 1. An LED light source, a light guide plate having an incident surface on which light from the LED light source is incident, and an exit surface on which the incident light is propagated and emitted, and other than the incident surface and the exit surface of the light guide plate A reflecting member provided so as to cover at least one surface of the light guide plate; and a light guide plate provided on a front surface of the light emitting surface, transmitting light emitted from the light emitting surface in all regions, and displaying an arbitrary pattern. A surface-emitting display device, comprising: a display panel. 2. The surface-emitting display device according to claim 1, wherein the light guide plate has a wedge shape that is thinner in a light guide direction from the incident surface to the opposite surface of the incident surface. 3. The light guide plate according to claim 1, wherein a scattering surface is provided on at least one of the light emitting surface and the light emitting surface facing the light emitting plate, and the scattering surface is a fine rough surface. Surface-emitting display device. 4. A light guide plate is provided on at least one of an exit surface and an opposite surface of the exit surface, and a rough surface having a pattern in which fine irregularities on the surface gradually become deeper as the distance from the entrance surface increases; The surface-emitting display device according to any one of claims 1 to 3, further comprising: a smooth surface provided so as not to scatter light. 5. The LED light source according to claim 1, wherein the LED light source is a white LED light source, and the display panel has an area for attenuating a blue component of light from the white LED light source. The surface-emitting display device according to any one of the preceding claims. 6. Between an LED light source and an incident surface of a light guide plate,
The surface-emitting display device according to any one of claims 1 to 4, further comprising a color adjustment filter that attenuates the light intensity of a predetermined color component. 7. The color adjusting filter according to claim 1, wherein the color adjusting filter is provided between the light emitting surface of the light guide plate and the display plate.
A surface-emitting display device according to any one of the above. 8. A reflector surrounding the LED light source and guiding light from the LED light source in a specific direction, wherein the surface of the reflector is a scattering reflection surface.
8. The surface-emitting display device according to any one of claims 1 to 7. 9. The light guide plate according to claim 1, further comprising at least one light-collecting sheet for collecting and emitting light from the light guide plate between the light guide plate and the display plate. The surface-emitting display device according to any one of the preceding claims. 10. The surface-emitting display device according to claim 1, wherein a light-emitting portion of the LED light source is brought into contact with a light guide plate incident surface. 11. The apparatus according to claim 1, further comprising means for bringing a light emitting portion of the LED light source into contact with a light guide plate incident surface.
10. The surface-emitting display device according to any one of claims 9 to 9. 12. The means for bringing a light emitting portion of an LED light source into contact with a light guide plate incident surface includes an LED holding an LED substrate.
One end is integrally formed in the substrate holder, and the other end is the L
12. The surface-emitting display device according to claim 11, comprising a leaf spring for urging the ED substrate in the direction of the light guide plate incident surface. 13. The surface-emitting display device according to claim 1, wherein LED light sources having different light outputs are arranged corresponding to regions of the display panel having different transmittances. 14. An L region having a high light output in a region having a high transmittance.
14. The surface-emitting display device according to claim 13, further comprising an ED light source. 15. An L region having a low light output in a region having a high transmittance.
14. The surface-emitting display device according to claim 13, further comprising an ED light source. 16. The surface light emitting device according to claim 1, further comprising: a frame-shaped case having an open front and back, and a back plate for holding a light guide plate on the back side of the case. Display device. 17. A reflector for guiding light from an LED light source in a specific direction, the back side of which is extended to hold the light guide plate, and the reflector and the back plate are integrated. Surface emitting display device. 18. The method for assembling a surface-emitting display device according to claim 16, wherein a light guide plate and a reflection member are mounted in the case after the display plate is fixed to a front side of the case, and then the back plate is mounted. Is fixed to the back side of the case.