JP2009075606A - Plane light-emitting display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a plane light-emitting device which has high light-emitting efficiency, uniform brightness on display surface, and high visibility and in which the using number of LED light sources is suppressed to minimum. <P>SOLUTION: This device comprises an LED light source 1, a light guide 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 guide plate 4 except the light incident surface 4a and the light-emitting surface 4b, and a display plate 7 mounted over the front surface of the light-emitting surface 4b of the light guide plate 4 to display a desired pattern by transmitting the light from the light-emitting surface 4b in the entire region. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a surface emitting display device using an LED light source and an assembling method thereof.

  FIG. 20 is a block diagram of a conventional surface-emitting display device disclosed in, for example, Japanese Patent Application Laid-Open No. 8-160892, where FIG. 20 (a) is a partial plan view of the device and FIG. 20 (b) is a portion of the device. It is sectional drawing and displays on one side. FIG. 21 is a diagram showing a light propagation state in the apparatus.

  In the figure, 1 is an LED light source, 14 is a light guide plate made of a highly translucent material such as acrylic resin, 9 is an LED fixing holder fitted into the end of the light guide plate 14, and 10 is on the surface of the light guide plate 14. Reference numeral 11 denotes a light emitting layer, and 12 denotes a frame provided on the peripheral surface of the light guide plate 14.

As shown in FIG. 20A, the light emitting layer 11 is composed of a dod pattern provided in a pattern display region X set almost at the center of the light guide plate surface, and each dot portion 11a scatters light. Light that is made of a reflective coating and hits the dot portion 11a is scattered and reflected here and returned into the light guide plate 14, and a part of the light enters the surface at a small incident angle and is emitted to the outside. go.
The dot pattern of the light emitting layer 11 is configured to be smaller in the vicinity of the LED light source 1 and larger as it is farther from the LED light source 1 so that the overall light amount on the surface of the light emitting layer 11 is substantially constant.

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

  On the surface of the light guide plate 14, as shown in FIG. 20A, a pattern display region X is set at the center, where the light emitting layer 11 is provided, and the other peripheral portion Y is The light is specularly reflected.

  The operation of light when the LED light source 1 is turned on in the surface-emitting display device configured as described above will be described with reference to FIG. The light from 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 while being specularly reflected between the front and back wall surfaces of the light guide plate 14, but is scattered and reflected when it hits the dot portion 11 a of the light emitting layer 11 and is 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 transmission 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 reflection region), light is emitted. Will be reflected back to this surrounding area. As described above, the character of the pattern filter 10 and the design pattern appear on the surface of the surface light emitting display device. At that time, the dot pattern of the light emitting layer 11 is configured so that the light reflectance becomes higher in the vicinity of the LED light source 1. As a result, the letters and designs that emerge are almost the same brightness.

Japanese Patent Laid-Open No. 8-160892 (paragraphs 0015 to 0022, FIGS. 1 and 2)

  Since the conventional surface-emitting display device as described above does not have a reflecting plate that covers the light guide plate 14, among the light reflected by the dot portions 11 a of the light emitting layer 11, the light directed to the characters of the surface pattern filter 10 and the design portion. Can be emitted to the surface, but the light of the pattern filter 10 and the light directed to the reflection region around the design portion are reflected by the reflection region, and light loss due to the reflectance occurs. In addition, there is a problem in that the light utilization efficiency is low because some of the light reflected by the reflection region is directed to other than the dot portion 11a and emitted to the back surface.

Even if the light emitting layer 11 is provided on the entire surface of the light guide plate 14, the light emission center direction of the LED light source 1 and the light emitting layer 11 are parallel to each other. There is a problem that there is a limit to the amount of light and unevenness in light brightness is likely to occur.
In addition, since the pattern filter 10 has a reflective portion, there are a portion that shines on the display board and a portion that does not shine, and it is difficult to see as a whole, and the visibility of the display itself is insufficient.
In addition, in order to brighten the display surface, it is necessary to use many high-power LED light sources 1 with high costs.
In addition, since there is a tolerance for work processing and assembly, it is not possible to bring all of the individual LED light sources 1 into contact with the light guide plate 14, and there is a problem that the incident efficiency is low.
Moreover, when the surface light emitting display device using the LED light source 1 and the fluorescent lamp are mixed, there is a problem that the sense of color uniformity is disturbed.
Further, it is not easy to improve the front luminance while securing an appropriate luminance even from an oblique direction.
In addition, the surface-emitting display device is assembled because the display plate is adhered to the case after the reflective member, the light guide plate, etc. are attached to the case, so the adhesive may adhere to the light guide plate, etc. There was a problem that a bug was discovered just before.

  The present invention has been made to solve the above-mentioned problems, and has high incidence efficiency of light from the LED light source to the light guide plate and high emission efficiency from the light guide plate, a bright display surface, and uneven brightness. High visibility, unification of colors with other light sources, front brightness can be improved, the number of LED light sources used can be minimized, and workability is good It is an object to obtain a light emitting display device and an assembling method thereof.

  A surface-emitting display device according to the present invention includes an LED light source, a light guide plate having an incident surface on which light from the LED light source is incident and an output surface from which the incident light is propagated and emitted, and the incident surface of the light guide plate. And a reflection member provided so as to cover at least one surface other than the emission surface, and provided on the front surface of the emission surface of the light guide plate. And a display board for displaying the pattern.

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

  In addition, a scattering surface is provided on at least one of the exit surface of the light guide plate or the surface facing the exit surface, and the scattering surface is a fine rough surface.

  In addition, the light guide plate is provided on at least one of the exit surface and the opposite surface of the exit surface, and has a rough surface with a pattern in which fine unevenness on the surface gradually becomes deeper as the distance from the entrance surface increases, and the light guide plate And a smooth surface that does not scatter.

  The LED light source is a white LED light source, and the display board has a region for attenuating the blue component of light from the white LED light source.

  In addition, a color adjustment filter that attenuates 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 adjustment filter is provided between the light exit surface of the light guide plate and the display plate.

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

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

  Moreover, the light emission part of a LED light source and the light-guide plate entrance surface are made to contact.

  Moreover, the light emission part of a LED light source is provided with a means to contact a light-guide plate entrance surface.

  Further, the means for bringing the light emitting part of the LED light source into contact with the light guide plate incident surface is integrally formed at one end in the LED substrate holder for holding the LED substrate, and the other end of the LED substrate is directed to the light guide plate incident surface direction. It is a leaf spring that biases.

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

  Further, an LED light source having a high light output is disposed in a region having a high transmittance.

  Further, an LED light source having a low light output is disposed in a region having a high transmittance.

  Also, a frame-like case having an open front and back and a back plate that holds the light guide plate on the back side of the case are provided.

  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 surface-emitting display device assembly method is the surface-emitting display device assembly method according to claim 16, wherein the display plate is fixed to the front side of the case, and then the light guide plate and the reflection member are mounted in the case. Next, the back plate is fixed to the back side of the case.

According to this invention, a light guide plate having an LED light source, an incident surface on which light from the LED light source is incident, and an exit surface from which the incident light is propagated and emitted;
A reflection member provided so as to cover at least one surface other than the incident surface and the exit surface of the light guide plate; provided on a front surface of the exit surface of the light guide plate; And a display board that transmits the entire region and displays an arbitrary pattern. Therefore, the emission efficiency is high, the display surface has no uneven brightness, and the visibility can be improved.

  In addition, since the light guide plate has a wedge shape that decreases in thickness in the light guide direction from the incident surface to the opposite surface of the incident surface, the emission efficiency can be further increased.

  Further, since at least one of the exit surface of the light guide plate or the surface opposite to the exit surface is provided with a scattering surface, and this scattering surface is a fine rough surface, the transmittance and the reflectance can be increased.

  In addition, the light guide plate is provided on at least one of the exit surface and the opposite surface of the exit surface, and has a rough surface with a pattern in which fine unevenness on the surface gradually becomes deeper as the distance from the entrance surface increases, and the light guide plate Since a smooth surface that does not scatter the light is provided, the luminance of the emitted light can be made uniform.

  In addition, since the LED light source is a white LED light source and the display board has a region that attenuates the blue component of the light from the white LED light source, the green region B can be prevented from becoming blue-green. Even if a surface light emitting display device equipped with a white LED light source and a surface light emitting display device equipped with a fluorescent lamp light source are mixed, it is possible to avoid disturbing the sense of color uniformity.

  In addition, since a color adjustment filter that attenuates 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 region B can be prevented from becoming blue-green. Even if a surface light emitting display device equipped with a white LED light source and a surface light emitting display device equipped with a fluorescent lamp light source are mixed, it is possible to avoid disturbing the sense of color uniformity.

  In addition, since the color adjustment filter is provided between the exit surface of the light guide plate and the display plate, the green region B can be prevented from becoming blue-green, and a surface emitting display device equipped with a white LED light source is provided. Even if a surface emitting display device equipped with a fluorescent lamp light source is mixed, it is possible to prevent the color uniformity from being disturbed.

  Moreover, since the 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 plate can be improved.

  In addition, since at least one condensing sheet that condenses and emits light from the light guide plate is provided between the light guide plate and the display plate, the front luminance is improved while ensuring moderate luminance even from an angle. Can be made.

  In addition, since the light emitting portion of the LED light source and the light guide plate incident surface are brought into contact with each other, it is possible to improve the efficiency of incidence from the LED light source to the light guide plate, and to prevent variations in incident efficiency due to manufacturing variations. Can do.

  Moreover, since the light emitting portion of the LED light source is provided with means for contacting the light guide plate incident surface, the incident efficiency from the LED light source to the light guide plate can be improved. Can be prevented.

  Further, the means for bringing the light emitting part of the LED light source into contact with the light guide plate incident surface is integrally formed at one end in the LED substrate holder for holding the LED substrate, and the other end of the LED substrate is directed to the light guide plate incident surface direction. Therefore, it is possible to improve the incident efficiency from the LED light source to the light guide plate, and to prevent variations in incident efficiency due to manufacturing variations.

  In addition, since LED light sources with different light outputs are arranged corresponding to areas with different transmittance of the display panel, the number of high-cost LED light sources that are expensive is kept to a minimum, and the brightness is sufficiently uniform as a whole. Can be obtained and can be easily viewed.

  In addition, since the LED light source with high light output is arranged in the high transmittance region, it is possible to obtain sufficient brightness by minimizing the number of expensive high-power LED light sources used. Can be.

  In addition, since the LED light source with low light output is arranged in the region with high transmittance, the number of expensive high-power LED light sources used can be minimized and sufficient uniformity can be obtained for easy viewing. it can.

  In addition, since a frame-like case having an open front and back and a back plate for holding the light guide plate on the back side of the case, assembly can be facilitated.

  In addition, the back side of the reflector that guides 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, so that the number of parts can be reduced, Assembly can be facilitated.

  17. The method of assembling a surface-emitting display device according to claim 16, wherein a light guide plate and a reflective member are mounted in the case after the display plate is fixed to the front side of the case, and then the back plate is attached to the case. Because it is fixed to the back side of the, assembly can be facilitated.

Embodiment 1 FIG.
1 is a cross-sectional view of a surface-emitting display device showing Embodiment 1, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a view showing a light propagation state of the main part of the device. In FIG. 1, reference numeral 1 denotes an LED light source, the shape of which is a shell type or a chip type, and the emission color is any color such as white, blue, green, red, and the like. Reference numeral 2 denotes an LED substrate on which the LED light source 1 is mounted, 3 denotes 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, and the surface of the reflector 3 is white PET resin or high It is a scattering reflection surface such as a reflection polycarbonate resin.

  4 is a light guide plate made of a material having high translucency such as acrylic resin, and the light from the LED light source 1 is incident from the incident surface 4a and propagates along the surface to be emitted as a surface light source from the emission surface 4b. The exit surface 4b has a rectangular shape, and one side surface thereof is the entrance surface 4a. Then, the thickness decreases in the light guiding direction from the incident surface 4a to the opposing surface 4c of the incident surface 4a, and the back surface 4d facing the output surface 4b has a wedge shape.

  A scattering surface 5 is provided on a back surface 4d opposite to the emission surface 4b and is an uneven surface for scattering light from the LED light source 1, and 6 covers at least one surface other than the incidence surface 4a and the emission surface 4b. The reflecting member is a white PET sheet or the like, and in this embodiment, the surface other than the back surface 4d and the facing surface 4c of the incident surface 4a is not covered. Reference numeral 7 denotes a display plate provided on the front surface of the light exit surface 4b of the light guide plate 4 to transmit the light emitted from the light exit surface 4b in the entire region, and 8 denotes a case. In FIG. 1, the scattering surface 5 is provided on the back surface 4d facing the exit surface 4b. However, the scattering surface 5 may be provided on both the exit surface 4b and the back surface 4d facing the exit surface 4b, or on the exit surface 4b. However, at least one of the exit surface 4b and the back surface 4d is provided with a scattering surface, and this scattering surface is made into a fine rough surface.

  Next, the operation of the embodiment will be described with reference to FIGS. FIG. 3A shows a conventional flat light guide plate, and FIG. 3B shows a wedge light guide plate according to the present invention. As shown in FIG. 1, the light from the LED light source 1 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 enters the output surface 4b and the scattering surface. 5 or the reflecting member 6 while being scattered and reflected.

  The light r1 is totally reflected at the exit surface 4b, then scattered and reflected by the scattering surface 5 or the reflecting member 6, and light incident on the exit surface 4b at an angle smaller than the critical angle of total reflection is emitted from the exit surface 4b. Then, what is displayed through the display board 7 is highlighted. At this time, a part of the scattered and reflected light is again totally reflected by the exit surface 4 b and again scattered and reflected by the scattering surface 5 or the reflecting member 6. In this way, the light emitted from the emission surface 4b sequentially illuminates the display plate while being repeatedly scattered and reflected by the emission surface 4b and the scattering surface 5 or the reflecting member 6. In addition, the light r2 is first scattered and reflected by the scattering surface 5 or the reflecting member 6, is emitted from the emission surface 4b, passes through the display plate 7, and causes what is to be displayed. At this time, a part of the scattered and reflected light is reflected again on the exit surface 4b, and is emitted from the exit surface 4b while repeating the reflection on the exit surface 4b and the scattering reflection on the scattering surface 5 or the reflecting member 6 similarly to the light r1. The illuminated light sequentially illuminates the display board and displays.

As shown in FIG. 2, when the light r2 is incident on the scattering surface, the light r3 scattered and reflected by the scattering surface 5 is scattered and transmitted by the scattering surface 5, as shown in FIG. There are light r4 emitted from 4 toward the reflecting member 6, light r5 scattered and reflected by the reflecting member 6, and returned to the light guide plate 4 again. In addition to this, the light scattered and reflected by the scattering surface 5 includes the light that guides the light guide plate 4 and the light that exits in the direction of the exit surface 4b as it is.
A scattering surface is provided on at least one of the back surface 4d and the exit surface 4b, and the scattering surface is a fine rough surface. The rough surface is formed as a transfer surface of the blasted mold surface, and has a transmittance. In addition, the reflectance can be increased. The scattering surface may be formed by printing, but in the case of printing, the loss of reflection is large, and there is a limit to making the print pattern fine, but when the scattering surface is formed by transfer of the mold surface The loss of reflection is small, the surface can be made fine and rough, the dots are not noticeable, and the printing process can be omitted.

  Further, since the surface of the reflector 3 is a scattering reflection surface such as white PET resin or highly reflective polycarbonate resin, the brightness (luminance) of the surface of the display plate 7 is increased by about 5% compared to the case of highly reflective aluminum.

  Next, the light propagation state between the conventional flat light guide plate and the wedge light guide plate of the present invention will be compared and described with reference to FIG. In the case of the wedge-shaped light guide plate of FIG. 3 (b), the back surface 4d facing the exit surface 4b is inclined, so that the reflection angle of the back surface 4d is smaller than that of the conventional flat light guide plate of FIG. There are many reflections. Therefore, in the wedge-shaped light guide plate as in the present invention, the number of times of total reflection in the light guide plate 4 is large, the incident angle of the light incident on the output surface 4b becomes smaller while the light is guided, and the scattered and reflected light is output on the output surface. The light emitted from 4b and emitted from the emission surface 4b increases, and the emission efficiency is high. Therefore, the display board is displayed brightly and uniformly.

As described above, the light guide plate 4 that receives the light of the LED light source 1 and emits the incident light, and the reflecting member 6 on at least one surface other than the incident surface 4a and the output surface 4b of the light guide plate 4 are provided. Therefore, the display surface has no uneven brightness, high visibility, and low power consumption.
Moreover, since the light guide plate 4 has a wedge shape with a reduced 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.
Further, since at least one of the exit surface 4a of the light guide plate 4 and the surface facing the exit surface 4a is provided with a scattering surface, and this scattering surface is a fine rough surface, the transmittance and the reflectance can be increased. The dots are not noticeable and the printing process can be omitted.
Moreover, since the surface of the reflector 3 is a scattering reflection surface such as a white PET resin or a highly reflective polycarbonate resin, the brightness of the surface of the display plate 7 can be improved.

Embodiment 2. FIG.
This embodiment shows a guide lamp using the surface-emitting display device shown in the first embodiment, and FIGS. 4 and 5 are partially broken plan views of the guide lamp showing the second embodiment.
In the figure, the same parts as those in FIG. 1a is an LED light source with a high bright output, 1b is a dark low-power LED light source, A is a white region with a high transmittance of the display board 7, and B is a green region with a low transmittance.

  And the high output LED light source 1a is arrange | positioned in the white area | region A with a high transmittance | permeability of the display board 7, and the low output LED light source 1b is each arrange | positioned in the green area | region B with a low transmittance | permeability. Accordingly, the region A having a high transmittance becomes brighter and the brightness of the entire display surface increases.

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

Embodiment 3 FIG.
In the second embodiment, a bright LED light source having a high output and a dark LED light source having a low output of the green region B having a low transmittance are arranged in a white region having a high transmittance on the display panel. Conversely, the form is such that a low-power LED light source is disposed in a white region with a high transmittance of the display panel, and a high-power LED light source is disposed in a green region with a low transmittance.
FIG. 6 is a partially broken plan view of the guide lamp showing the third embodiment. In FIG. 6, the same parts as those in FIG.

  As shown in FIG. 6, a low output LED light source 1b is disposed in the white area A of the display plate 7 where the transmittance is high, and a high output LED light source 1b is disposed in the green area B where the transmittance is low. Accordingly, the brightness of the region A with high transmittance and the green region B with low transmittance are uniform.

  As described above, it is possible to obtain sufficient uniformity and make it easy to see by minimizing the number of high-cost high-power LED light sources 1a used.

Embodiment 4 FIG.
The present embodiment combines the second and third embodiments, and FIG. 7 is a partially broken plan view of the guide lamp showing the fourth embodiment.
In the figure, the same parts as those in FIG.

In the figure, in the left half of the display board 7a, as in the second embodiment, a bright high-power LED light source 1a is provided in a high-transmittance area A of characters and arrows, and a non-character background low-transmittance area. A dark low-power LED light source is disposed in B, and in the display plate 7b on the right half of the figure, a low-power LED light source is provided in a high-transmittance area A in the background that is not letters or arrows, as in the third embodiment. A high-power LED light source is provided in each region B having a low transmittance of characters and arrows.
Therefore, the display becomes uniform and bright as a whole.
In the figure, two high-power LED light sources 1a are used for the character portion. However, the number of high-power LED light sources 1a corresponding to the number and size of characters is used.

  As described above, it is possible to obtain a sufficiently uniform brightness as a whole and to make it easy to see by minimizing the number of expensive high-power LED light sources 1a used. In addition, the LED light sources 1a and 1b having different outputs depending on the display contents can be used easily.

Embodiment 5 FIG.
FIG. 8 is a cross-sectional view and a plan view of the surface-emitting display device according to the fifth embodiment, and FIG.
In FIG. 8, the same parts as those in FIGS. 1 and 2 showing the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. 21 is provided on the back surface 4d, which is the surface opposite to the exit surface 4b of the light guide plate 4, and has a rough surface with a pattern in which fine irregularities on the surface gradually become deeper as the distance from the entrance surface increases, and 22 indicates the entrance 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 horizontal and vertical ranges of the display surface area, and C is a range from the incident surface including a portion S that is not affected by light and is shaded due to the directivity of the LED light source 1. In FIG. 8, the rough surface 21 and the smooth surface 22 are provided on the back surface 4d facing the exit surface 4b, but provided on both the exit surface 4b and the back surface 4d facing the exit surface 4b or only on the exit surface 4b. May be.

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

  Further, the range of C from the incident surface including the shadow portion S cannot be used as a display surface portion because of uneven brightness. Therefore, if light is emitted to the outside at this portion, a loss occurs, but by setting the range C from the incident surface to the smooth surface 22, the light is totally scattered without being scattered on this surface, and the light is directed toward the display surface area. As a result, the display surface is brightened.

  As described above, the back surface 4d of the light guide plate 4 includes the rough surface 21 in which fine unevenness of the surface gradually becomes deeper as the distance from the incident surface increases, and the smooth surface 22 that does not scatter light on the incident surface 4a side. The brightness can be made uniform. In addition, the display surface can be brightened.

Embodiment 6 FIG.
This embodiment shows a guide light using the surface-emitting display device shown in the first embodiment, and FIG. 10 shows the guide light showing the sixth embodiment.
In the figure, 1C is a white LED light source, 7 is a display board, and 8 is a case. The display board 7 is a board made of a semi-transparent or transparent material such as highly translucent acrylic resin or polycarbonate resin, and the surface may be satin.
A is a white area | region of the display board 7, B is a green area | region. The green region B is formed by printing with green ink or pasting a green seal, and lowers the light transmittance of the blue component of the green ink and green seal.

  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 region B is blue-green (xy chromaticity coordinates (x, y) = (0.17, 0.34). However, even if light having a large blue component peculiar to the white LED light source 1C passes, the green region B does not become blue-green but becomes green ((x, y ) = (0.24, 0.51)). The white area A is adjusted by the color of the white LED light source 1C itself. In the white LED light source 1C, the light emitted from the LED elements in the white LED light source 1C is generally blue light, and the phosphor disposed in the white LED light source 1C emits yellow light by the blue light. . The yellow light by the phosphor and the blue light emitted from the LED element are combined to become white light, but the white light of the current white LED light source 1C has a large blue component.

  As described above, since a region for attenuating the blue component of light from the white LED light source is provided, the green region B can be prevented from becoming bluish green, and the surface light emitting device equipped with the white LED light source 1C is provided. Even if a display device and a surface emitting display device equipped with a fluorescent lamp light source are mixed, it is possible to avoid disturbing the sense of color uniformity.

Embodiment 7 FIG.
FIG. 11 shows a guide light showing a fourth embodiment. In the figure, the same parts as those in FIG. Reference numeral 1 denotes an LED light source, and reference numeral 23 denotes a color adjustment filter between the LED light source 1 and the incident surface of the light guide plate 4 to attenuate a part of blue light to the same light as the fluorescent lamp.
Thus, since it can convert into the light of the same color as a fluorescent lamp, it can prevent the green area | region B becoming blue-green. Further, the color adjustment filter may be provided between the exit surface of the light guide plate 4 and the display plate.

As described above, the color adjustment filter 23 that attenuates part of the blue light is provided between the white LED light source 1C and the incident surface 4a of the light guide plate 4 or between the output surface of the light guide plate 4 and the display plate. Since it is provided, it is possible to prevent the green area B from becoming blue-green, and the color is unified 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 are mixed. You can avoid disturbing the feeling.
In this embodiment, the case of a white LED light source is shown. However, 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 cross-sectional view of a surface light emitting display device according to an eighth embodiment. In the figure, the same parts as those in FIG. Reference numeral 25 denotes a condensing sheet that condenses and emits light from the light guide plate 4 between the light guide plate 4 and the display plate 7. As the condensing sheet 25, a diffusion sheet or a prism sheet is used, and one or more sheets are used.

  FIG. 13 shows the relationship between the angle distribution of the display surface luminance of the display panel 7 when the diffusion sheet is used as the light collecting sheet 25 and when it is not used, and 0 degrees indicates the front direction. As shown in the figure, when the condensing sheet 25 is not used, the front luminance is low, but the one using the condensing sheet 25 can increase the front luminance without reducing the luminance in the oblique direction so much. In this case, the front luminance is 1.3 to 1.4 times that when the condensing sheet 25 is not used. Note that the prism sheet is used for special purposes because it has a high concentration ratio.

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

Embodiment 9 FIG.
FIG. 14 is a partial cross-sectional view of a surface light emitting display device showing Embodiment 6. In FIG. In the figure, the same parts as those in FIG. Reference numeral 35 denotes an LED board holder that houses the LED board 2, and 26 denotes a leaf spring that brings the light emitting portion of the LED light source 1 into contact with the incident surface 4 a of the light guide plate 4.
One end of the leaf spring 26 is integrally formed in the LED substrate holder 35, and the other end urges 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. When the LED substrate holder 35 is set at a predetermined position, the light emitting portion of the LED 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 leaf spring 26 so as to be in uniform contact. Can do.

  Thus, conventionally, it was not easy to make the light emitting portion of the LED light source 1 uniformly contact the incident surface 4a of the light guide plate 4 in terms of work, but one end was integrally formed in the LED substrate holder 35. Since the light emitting portion of the LED light source 1 is uniformly brought into contact with the incident surface 4a of the light guide plate 4 by the leaf spring 26, 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 variations in incident efficiency due to manufacturing variations.

Embodiment 10 FIG.
15 is a longitudinal sectional view of a surface light emitting display device showing Embodiment 10, FIG. 16 is a transverse sectional view, FIG. 17 is an assembly view of the surface light emitting display device, FIG. 18 is a longitudinal sectional view of the surface light emitting display device, and FIG. FIG. 2 is a cross-sectional view of a conventional surface light emitting display device.
In the figure, the same reference numerals are given to the same portions as those in FIG.
In FIGS. 15 and 16, reference numeral 31 denotes a frame-like case having an open front and back, 32 denotes a back plate for holding a light guide plate provided on the back side of the case 31, and 33 denotes an adhesive.

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

  In addition, as shown in FIG. 18, the back side of the reflector 3 that guides light from the LED light source 1 in a specific direction is extended so as to hold the light guide plate, and the reflector 3 and the back plate are integrated. The reflector 36 may be used, and the reflection member 6 may be omitted by doing in this way.

It is sectional drawing of the surface emitting display apparatus which shows Embodiment 1 of this invention. It is the elements on larger scale of FIG. It is the figure which showed the propagation state of the light of the surface emitting display apparatus of FIG. It is a partially broken top view of the surface emitting display apparatus which shows Embodiment 2 of this invention. It is a partially broken top view of the surface emitting display apparatus which shows Embodiment 2 of this invention. It is a partially broken top view of the surface emitting display apparatus which shows Embodiment 3 of this invention. It is a partially broken top view of the surface emitting display apparatus which shows Embodiment 4 of this invention. It is sectional drawing and the top view of the surface emitting display apparatus which show Embodiment 5 of this invention. FIG. 6 is a relationship diagram between a change in roughness depth of a rough surface depending on a distance from an incident surface side and luminance of an output surface. It is a partially broken front view of the guide light which shows Embodiment 6 of this invention. It is a partially broken front view of the guide light which shows Embodiment 7 of this invention. It is sectional drawing of the surface emitting display apparatus which shows Embodiment 8 of this invention. It is a related figure of the angle distribution of the display surface brightness | luminance of the display board when not using a condensing sheet as a diffusion sheet. It is a fragmentary sectional view of the surface emitting display apparatus which shows Embodiment 9 of this invention. It is a longitudinal cross-sectional view of the surface emitting display apparatus which shows Embodiment 10 of this invention. It is a cross-sectional view of a surface-emitting display device showing Embodiment 10 of the present invention. It is assembly explanatory drawing of the surface emitting display apparatus which shows Embodiment 10 of this invention. It is a longitudinal cross-sectional view of the surface emitting display apparatus which shows Embodiment 10 of this invention. It is a cross-sectional view of a conventional surface emitting display device. It is a block diagram of the conventional surface emitting display apparatus. It is the figure which showed the propagation state of the light of the surface emitting display apparatus of FIG.

Explanation of symbols

  1 LED light source, 1a high power LED light source, 1b low power LED light source, 1C white LED light source, 2 LED substrate, 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 condensing sheet, 26 leaf spring, 31 frame-shaped case, 32 back plate, 35 LED substrate holder, 36 back plate combined reflector.

Claims (18)

An LED light source;
A light guide plate having an incident surface on which light from the LED light source is incident and an output surface from which the incident light is propagated and emitted;
A reflective member provided to cover at least one surface other than the incident surface and the light exit surface of the light guide plate;
A display plate that is provided in front of the light exit surface of the light guide plate, transmits the light emitted from the light exit surface in the entire region, and displays an arbitrary pattern;
A surface-emitting display device comprising:   2. The surface-emitting display device according to claim 1, wherein the light guide plate has a wedge shape whose thickness is reduced in a light guide direction from the incident surface to the opposite surface of the incident surface.   3. The surface-emitting display device according to claim 1, wherein a scattering surface is provided on at least one of the exit surface of the light guide plate or an opposing surface of the exit surface, and the scattering surface 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 unevenness of the surface gradually deepens as the distance from the entrance surface increases;
A smooth surface provided on the incident surface side that does not scatter light;
The surface-emitting display device according to claim 1, further comprising:   5. The surface-emitting display according to claim 1, wherein the LED light source is a white LED light source, and the display board has a region for attenuating a blue component of light from the white LED light source. apparatus.   5. The surface emitting display device according to claim 1, further comprising a color adjustment filter that attenuates light intensity of a predetermined color component between the LED light source and the incident surface of the light guide plate. .   5. The surface-emitting display device according to claim 1, wherein the color adjustment filter is provided between an emission surface of the light guide plate and the display plate.   8. A surface-emitting display device according to claim 1, further comprising a reflector that surrounds the LED light source and guides light from the LED light source in a specific direction, and the surface of the reflector is a scattering reflection surface. .   9. The surface-emitting display according to claim 1, further comprising at least one condensing sheet for condensing and emitting light from the light guide plate between the light guide plate and the display plate. apparatus.   The surface-emitting display device according to claim 1, wherein a light emitting portion of the LED light source and a light guide plate incident surface are brought into contact with each other.   10. The surface emitting display device according to claim 1, further comprising means for bringing a light emitting portion of the LED light source into contact with an incident surface of the light guide plate.   The means for bringing the light emitting portion of the LED light source into contact with the light guide plate entrance surface is integrally formed at one end in the LED substrate holder that holds the LED substrate, and the other end attaches the LED substrate toward the light guide plate entrance surface. 12. The surface-emitting display device according to claim 11, wherein the surface-emitting display device is a leaf spring.   13. The surface emitting display device according to claim 1, wherein LED light sources having different light outputs are disposed corresponding to regions having different transmittances of the display panel.   14. The surface emitting display device according to claim 13, wherein an LED light source having a high light output is disposed in a region having a high transmittance.   14. The surface emitting display device according to claim 13, wherein an LED light source having a low light output is disposed in a region having a high transmittance.   The surface-emitting display device according to claim 1, further comprising: a frame-like case having front and back openings; and a back plate that holds a light guide plate on the back side of the case.   17. The surface-emitting display device according to claim 16, wherein a rear surface side of a reflector for guiding light from the LED light source in a specific direction is extended so as to hold a light guide plate, and the reflector and the back plate are integrated. .   17. The method of assembling a surface-emitting display device according to claim 16, wherein after attaching the display plate to the front side of the case, the light guide plate and the reflecting member are mounted in the case, and then the back plate is attached to the back side of the case. A method of assembling a surface-emitting display device, characterized by being fixed to the surface.

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