JP3165378B2 - Surface illuminated display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface for guiding light from a light source to a predetermined display surface side, such as an industrial (especially industrial) display lamp, and for performing an optical display on the entire display surface. The present invention relates to an illuminated display device.

[0002]

2. Description of the Related Art In order to safely operate a system in a factory or the like, it is necessary for an operator to always operate, control, manage, operate, etc. machines while monitoring the state of the machines and facilities. There is. For this reason, a control panel or the like in a factory is provided with an indicator light for displaying the state of the system. Such indicators include "ON", "OFF", "Driving",
It has a light transmissive plate (name plate) on which characters such as "abnormal" are displayed, and by turning on a light source provided behind those name plates according to the operation state of the system,
An optical display is performed on the entire display surface, and is visually recognized by an operator. Indicators can take a variety of forms, typical of which are a single indicator for displaying a single piece of information, a collective indicator for displaying multiple pieces of information, and systems such as start / stop. There is an illuminated push button switch to which an operation function is added.

[0003] That is, the indicator light is a device for transmitting the state of the system to the operator on a control panel or the like, and is important as a man-machine interface for the operator to operate the system safely. It is in.

[0004] By the way, there is a demand for displaying such a display lamp in a color-coded manner. Because, usually, a plurality of indicator lights are attached to one control panel, etc., rather than displaying characters in a single color, color-code according to the purpose of the indicator lights and display characters together with the color. This can improve the visibility of the indicator light.

Therefore, conventionally, light of different wavelengths is used,
For example, LED light-emitting elements that emit red, green, and blue light are respectively prepared, and LED light-emitting elements of different types are combined with each other according to a desired color of display light,
Light of a desired color is obtained by superimposing the light emitted by each type of LED light emitting element.

[0006]

However, in the conventional method of obtaining light of a desired color by combining different types of LED light emitting elements, it is necessary to change the combination of LED light emitting elements for each desired light color. In addition, there is a problem that current control is required for each type of LED light emitting element, so that a complicated circuit is required. Further, since a complicated process is required in manufacturing, productivity is low and cost is high.

The present invention is intended to overcome the above-mentioned problems in the conventional surface-illuminated display device, and it is possible to obtain a clear display light of any color by a single color light source light.
An object of the present invention is to provide a surface-illuminated display device capable of improving productivity and reducing costs.

[0008]

The technical means for achieving the above object comprises a plurality of blue LEDs arranged in a matrix and emitting blue light as the first wavelength light.
An LED light source that, opposed to the LED light source, the LED
A second wavelength longer than the first wavelength by the light of the first wavelength incident through the incident surface, the second wavelength having an incident surface for receiving light from the light source, and an exit surface facing a predetermined display surface side; And a fluorescent plate that emits the light of the second wavelength from the emission surface, and the fluorescent plate interposed between the emission surface of the fluorescent plate and the display surface and emitted from the emission surface. A filter that removes the first wavelength light transmitted through the filter and transmits only the second wavelength light, and performs optical display on the entire display surface using the second wavelength light transmitted through the filter. It is characterized by the following.

[0009]

[0010] Bei a plurality of blue LED arranged in a matrix for emitting light <br/> of blue wavelength as the first wavelength light
A LED light source to obtain, facing the LED light source, the LE
A filter having an entrance surface for receiving light from the D light source and an exit surface facing a predetermined display surface side, and transmitting only light of a second wavelength longer than the first wavelength; Coated on a surface, receiving the light of the first wavelength,
A fluorescent material that emits light of a wavelength, wherein optical display is performed on the entire display surface by the light of the second wavelength transmitted through the filter.

[0011] Further, a light diffusing means for diffusing the light from the LED light source to the display surface side on an optical path of the light is further provided.

[0012]

In the above description, "removing the light of the first wavelength" is not limited to removing 100%, but it is sufficient that the light of the first wavelength is almost completely removed. . Further, the phrase “transmit only the light of the second wavelength” is not limited to the meaning that the light of the second wavelength is completely transmitted, but the transmitted light slightly includes the light of the first wavelength. The state is also included.

That is, it may be in a state where light of the second wavelength substantially occupies substantially visually.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

A. First Embodiment FIG. 1 is a perspective view showing a collective indicator light to which a first embodiment of a surface illuminated display device according to the present invention is applied. When the collective indicator light 1 is actually installed and used, the upper side of FIG. 1 is installed facing the operator side as a display surface side. However, here, for convenience of illustration, the display surface side is set up. Is shown.

The collective indicator light 1 is constructed by assembling a plurality of unit indicator lights 10a, 10b,... These unit indicators 10a, 10
b,..., 10i are different in size and display color, but have the same basic configuration.
, 10i correspond to the first embodiment of the surface illuminated display device according to the present invention. In the following, the configuration of the unit indicator lamp 10a will be described, and the description of the other configurations will be omitted.

FIG. 2 is an exploded perspective view of the unit indicator lamp 10a. FIG. 3 is a schematic sectional view of the unit indicator light 10a of FIG. In the unit display lamp 10a, a plurality of light sources 12 (LED light emitting elements) are arranged in a matrix inside a resin case 11 having a window W. Each light source 12 is mounted on the main surface of the printed circuit board and housed in the case 11, and its light emitting portion is exposed toward the upper surface of the case 11. These light sources 12
Emits light of any one of the wavelengths from the ultraviolet region to blue (first wavelength), in this case, light of the blue wavelength.

On the other hand, a frame 13 is arranged around the upper surface of the window W. This frame 13 is case 1
1 is fitted into the housing 2 of FIG. 1, and the composite plate 20 is fitted into the frame 13. The composite plate 20 has a structure in which a fluorescent plate 21, a transparent resin name plate 22, a filter 23, a milky white diffusion plate 24 (diffusion means), and a transparent resin cover plate 25 are superimposed from the light source 12 side. Has become. Characters and symbols to be displayed are written on the name plate 22.

Among them, the fluorescent plate 21 and the filter 23 are provided according to the main features of the present invention. The fluorescent plate 21 has an incident surface 21a that receives light from the light source 12 and an emission surface 21 that faces the display surface side (upper side in the figure).
b, and emits light of a second wavelength longer than the first wavelength by the light of the first wavelength incident through the incident surface 21a;
The light of the second wavelength is emitted from the emission surface 21b. Filter 2
3 removes the first wavelength light transmitted through the fluorescent plate 21 from the light emitted from the emission surface 21b of the fluorescent plate 21 and transmits only the second wavelength light. FIG. 4 schematically illustrates this optical phenomenon.

FIG. 4 is a schematic diagram showing the optical characteristics of the fluorescent plate 21 and the filter 23. The fluorescent plate 21 is formed by mixing a transparent resin material with a fluorescent material (color conversion paint) having a fluorescent characteristic described later and molding it into a sheet or plate shape, and the reference numeral FM in FIG. . When the fluorescent material FM returns to the ground state after being excited by the light L1 of the first wavelength shown by the solid line in the same figure, it emits the light L2 of the second wavelength longer than the first wavelength (broken line in the same figure). It has a fluorescent characteristic. Incident surface 21 of fluorescent screen 21
When the light L1 of the first wavelength from the light source 12 is incident on a, the incident light L1 is absorbed by the fluorescent material FM, and light (fluorescence) L2 of the second wavelength longer than the first wavelength is emitted, and the emission surface 21b
Is emitted.

The filter 23 is for removing the light L1 of the first wavelength transmitted through the fluorescent plate 21 and transmitting only the light L2 of the second wavelength to the display surface side as display light. The light L1 of the first wavelength incident on the filter 23 is
While the light L2 is sufficiently attenuated before reaching the surface 23a on the display surface side of the filter 23 and does not pass through the filter 23, the light L2 of the second wavelength passes through the filter 23 almost without being attenuated. Thus, light composed of the light L2 of the second wavelength is emitted from the surface 23a of the filter 23.

Next, returning to FIG. 2, the description will be continued. Light source 1
When the light of the first wavelength emitted from 2 enters the fluorescent plate 21, the fluorescent plate 21 receives the light of the first wavelength and emits light of the second wavelength. The light of the first wavelength transmitted through the fluorescent plate 21 together with the light of the second wavelength is transmitted through the name plate 22 to the filter 2.
3, the filter 23 removes the first wavelength light from the first and second wavelength lights, and substantially only the second wavelength light is emitted from the surface 23a of the filter 23.
Then, the light of the second wavelength transmitted through the filter 23 is guided to the display surface side via the milky white diffusion plate 24 and the cover plate 25, and an optical display is performed.

As described above, according to the indicator lamp (surface illuminated display device) 10a of this embodiment, the light for optical display on the display surface side is substantially composed of only the light of the second wavelength. Since the first wavelength light is not included, the color of the second wavelength light emitted by the fluorescent plate 21 can be purely extracted as the color of the display light, and as a result, the wavelengths differ from those of the related art. Compared to a method of obtaining light of a desired color by superposing a plurality of types of light, a clear light color can be obtained.

In addition, light of the first wavelength, here blue light, receives light of the second wavelength of various colors (for example, red, yellow,
Multiple types of fluorescent screens 2 that emit light of orange, green, etc.)
1 and a plurality of types of filters 23 according to the type of the fluorescent plate 21 are prepared.
By selecting from the above, it is possible to obtain light of various colors that cannot be obtained by a single type of LED light emitting element, from light of the first wavelength emitted by the light source 12, here blue light. As a result, light for display of a desired color can be obtained from light of the first wavelength (blue light) simply by replacing the fluorescent plate 21 and the filter 23. It is possible to improve the productivity and reduce the cost as compared with changing the combination of the types of the LED light emitting elements used together. The fluorescent screen 21
The combination of the filter and the filter 23 will be described with a specific example in a later embodiment.

Further, in this embodiment, the filter 23
Is diffused by the milky-white diffuser plate 24, and then emitted to the display surface side via the cover plate 25.
As a result, unevenness in the amount of light on the display surface is reduced.

In this embodiment, since the light of the first wavelength is light having a short wavelength having any one of the wavelengths from the ultraviolet region to blue, here blue light, the first wavelength Light of various colors can be created than the light of

In this embodiment, the milky white diffusion plate 24 is used as the diffusion plate, but a hologram diffusion plate may be used. Further, in this embodiment, the milky white diffusion plate 24 is provided on the display surface side of the fluorescent plate 21, the name plate 22 and the filter 23. However, the present invention is not limited to this, and the optical path from the light source 12 to the cover plate 25 is not limited. It is sufficient that the diffusion plate 24 is provided at any position.

B. Second Embodiment FIG. 5 is a perspective view showing an illuminated push button switch to which a second embodiment of the surface illuminated display device according to the present invention is applied, and FIG. 6 is a partial perspective exploded view of FIG. . FIG. 5 shows an example in which the illuminated push button switch 40 is mounted on a panel 70 such as a control panel. The illuminated push button switch 40 is of a separate type, and its components are an operation unit 60 inserted into the mounting hole 71 from the front side (operation side) of the panel 70 and an operation unit unit on the back side of the panel 70 The contact unit 50 is roughly divided into a contact unit 50 connected to the body 62 of the unit 60. Among them, the contact unit 50 has a built-in switch contact and the LED unit light source 54 is mounted. This LED
The unit light source 54 has a substantially cylindrical shape, and a plurality of L light sources that emit light of any one of the wavelengths from the ultraviolet region to blue (first wavelength), here a blue wavelength, are provided on the top.
The ED light emitting elements 54L are arranged. Also, a ring 55 used when attaching the operation unit 60 to the panel 70 is separately provided, and the operation unit 6
A lock lever 53 for fixing the connection after connecting the contact unit 50 with the contact unit 50 is provided. The contact unit 50 is electrically connected to required equipment via a terminal 52.

On the other hand, the operation section unit 60 includes an operation section main body 61 and a push section 80. A projecting ridge 51 formed on the inner wall of the mounting hole 51H is provided on the body 62 of the operation section main body 61.
An insertion groove 62a is provided so as to be able to fit with a. The body 62 of the operation unit unit 60 is inserted into the mounting hole 51H of the contact unit 50 while engaging the ridge 51a with the insertion groove 62a. It has become. When the lock lever 53 is rotated after the insertion is completed, the protrusion 51a is formed.
The protrusion (not shown) of the lock lever 53 disposed inside is rotated and fitted into a fixing groove 62b provided orthogonal to the insertion groove 62a, and the operation unit 60 and the contact unit 50 are connected to each other. Are connected and fixed. The body portion 62 has a male screw surface 62S formed thereon, and is screwed with the female screw surface 55S of the ring 55, whereby the operation portion main body 61 is mounted on the panel 70.

A rectangular receptacle 6 is provided on the upper part of the operation section main body 61.
3 is formed, and a push portion 80
Is accommodated. Although details of the push unit 80 will be described later, the push unit 80 opens and closes the contacts in the contact unit 50 by manually pressing the push unit 80 after assembly. The LED unit light source 54 may be turned on or off in response to the opening and closing of the contact. In addition, the LED unit light source 54 receives signals from an external device (such as a controller) to which the illuminated push button switch 40 is connected. It may be turned on or off in response. The operation surface 80S of the push section 80 is translucent,
The operation surface 80 is controlled by light from the ED unit light source 54.
Characters and the like displayed inside S are illuminated and recognized from the outside.

The disassembled state of the push section 80 is shown in FIG. In the figure, the lower part of the push part 80 is a through hole W
1, a fluorescent plate 82 having the same fluorescent characteristics as the fluorescent plate 21 in the first embodiment, and a colorless and transparent nameplate 8 formed of a resin such as acrylic.
3. The filter 84 and the hologram diffuser 85 are stacked in this order. And the operation surface 80 of FIG.
As a member that defines S, a colorless and transparent front plate 86 made of, for example, acrylic is provided. Required characters and the like are written on the name plate 83.

The LED unit light source 54 is inserted so as to face the fluorescent plate 82 through the through hole W1. Therefore, when the LED unit light source 54 is turned on, the light of the first wavelength from the LED light emitting element 54L is incident on the incident surface 82 of the fluorescent screen 82.
a. Then, the incident light is wavelength-converted into light of a second wavelength longer than the first wavelength by the fluorescent material (not shown) of the fluorescent plate 82 and emitted from the emission surface.
The light sequentially passes through the name plate 83, the filter 84, and the diffusion plate 85, and performs surface illumination display with a display color defined by the second wavelength on the display surface side. Here, the filter 84 of the above-described first embodiment that transmits only light of the second wavelength is used.
The filter 84 has the same optical characteristics as that of the first filter 3, and the light of the first wavelength transmitted through the fluorescent plate 82 without being wavelength-converted is removed by the filter 84. Only two wavelengths of light are emitted.

As described above, also in the second embodiment, light for display of an arbitrary clear color can be obtained from light of a single color of light (light of the first wavelength). The same effects as in the first embodiment, such as the possibility of cost reduction, are obtained.

C. Related Art Here, the related technology of the present invention will be described. What
The related technology described here constitutes an embodiment of the present invention.
It does not. FIG. 7 is a schematic sectional view showing a related technique of the surface illuminated display device of the present invention. In this surface illumination display device, a wavelength conversion plate 91 is used instead of the fluorescent plates 21 and 82 and the filters 23 and 84 in each of the above-described embodiments.
(Wavelength conversion member), and an LED light emitting element that emits light of a blue wavelength (first wavelength) is used as the light source 92 as in the above embodiments.

The wavelength conversion plate 91 is composed of a base material 93 and the fluorescent material FM of the first embodiment mixed in the base material 93.
And a fluorescent material FMa having the same fluorescent characteristics as described above. The base material 93 of the wavelength conversion plate 91 is colored in a predetermined color by mixing a pigment into a transparent resin such as acryl. Of the light incident on the base material 93, light of a predetermined color (second wavelength) Is transmitted almost without attenuating, but light other than a predetermined color is attenuated in the base material 93 and hardly passes through the base material 93. The base material 9
3, the fluorescent material FMa is mixed, so that when the light L1 of the first wavelength enters the wavelength conversion plate 91 from the incident surface 91a, the fluorescent material FMa receives the light L1 of the first wavelength and receives the first wavelength. Light L2 having a longer second wavelength is emitted, and substantially only light L2 having the second wavelength is emitted from the emission surface 91b.

FIG. 8 shows how the light of the first wavelength is converted into light of the second wavelength. In the figure, the horizontal axis indicates the traveling direction of the light, and the vertical axis indicates the intensity of the light. As shown in the figure, the light of the first wavelength incident on the wavelength conversion plate 91 is attenuated by the base material 93, and at the same time is converted into the light of the second wavelength by the fluorescent material FMa, and passes through the base material 93. Advance, exit surface 91b
Is reached, the intensity is almost zero. On the other hand, the intensity of the light of the second wavelength increases from the incident surface 91a to the emission surface 91b, so that substantially only the light of the second wavelength is emitted from the emission surface 91b. Has become.

According to this related technique , light for display of an arbitrary clear color can be obtained from a single color light source light (light of the first wavelength), and productivity can be improved and cost can be reduced. In addition to the same effects as those of the above-described first embodiment, the first wavelength light can be converted into the second wavelength light with a single wavelength conversion plate 91, which is excellent in miniaturization and cost reduction. It has the effect of being.

D. Third Embodiment FIG. 9 is a sectional view of a filter used in a surface-illuminated display device according to a third embodiment of the present invention. In the surface illuminated display device, as in the first and second embodiments described above, the fluorescent screen 2
Instead of using the light emitting elements 1 and 82, a fluorescent material FMb is applied to the incident surface 101a of the filter 101, and a light source (not shown) emits light of a blue wavelength (first wavelength) as in the above-described embodiments. An LED light emitting element that emits light is used.

The fluorescent material FMb has the same fluorescent characteristics as the fluorescent materials FM and FMa described above, and receives light of the first wavelength from the light source and emits light of the second wavelength longer than the first wavelength. I do. The filter 101 transmits substantially only the light of the second wavelength. As a result, the light of the first wavelength transmitted through the fluorescent material FMb applied to the incident surface 101a is sufficiently attenuated while traveling through the filter 101, and hardly exits from the exit surface 101b of the filter 101. On the other hand, since the light of the second wavelength emitted by the fluorescent material FMb travels through the filter 101 with almost no attenuation, substantially only the light of the second wavelength is emitted from the emission surface 101b. I have.

In the surface illuminated display device of the third embodiment,
The first embodiment, in which light for display of an arbitrary clear color can be obtained from a single color light source light (light of the first wavelength), and productivity can be improved and cost can be reduced. The same effect can be obtained, and the light of the first wavelength can be converted into the light of the second wavelength by one filter 101 coated with the fluorescent material FMb, so that it is excellent in miniaturization and cost reduction. To play.

E. Fourth Embodiment FIG. 10 shows a fourth embodiment of the present invention.
It is sectional drawing of the fluorescent screen and filter used for the surface illuminating display device of 4th Embodiment. In this surface illuminated display device, a fluorescent plate 111 having the same fluorescent characteristics as the fluorescent plates 21 and 82 described above and a filter 112 having the same characteristics as the filters 23 and 84 described above are integrally formed in a state where they are stacked. The light source (not shown), which is molded, has an LE that emits light of a blue wavelength (first wavelength), similarly to the above embodiments.
A D light emitting element is used.

The filter 112 is located on the emission surface side of the fluorescent plate 111, and receives only light of the first wavelength from the light source and substantially only emits light of the second wavelength longer than the first wavelength emitted by the fluorescent plate 111. The light is emitted from the emission surface of the filter 112.

In the surface illuminated display device of the fourth embodiment,
The first embodiment, in which light for display of an arbitrary clear color can be obtained from a single color light source light (light of the first wavelength), and productivity can be improved and cost can be reduced. The same effect is obtained, and the fluorescent plate and the filter are integrated, so that the number of parts is reduced and the assembling process can be simplified.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the embodiments described below, five types of fluorescent plates and filters are prepared, and the first wavelength light is actually incident on each fluorescent plate and filter. (Light of the second wavelength). In each of the embodiments, the light sources are all shown in FIG.
The values of the x component and the y component of the chromaticity coordinates when the spectrum has a spectrum shown by a solid line in the middle and is expressed by using the color expression by the CIEXYZ color system are x = 0.131 and y = 0.120. An LED light emitting element that emits blue light (light of a first wavelength) is used, and the light emitted by the light source is provided with a fluorescent plate, a transparent resin name plate, a filter, a milky white diffusion plate, and a cover plate. The light of the second wavelength emitted from the cover plate is guided to a composite plate having the same configuration as the composite plate 20 of the first embodiment. In FIGS. 11 to 13, the vertical axis indicates the light intensity, and the horizontal axis indicates the wavelength of the light.

In the first embodiment, Acrylite (fluorescent color) product number 995 manufactured by Mitsubishi Rayon was used for the fluorescent plate, and a red filter was used for the filter. As a result, it has a spectrum indicated by a solid line in FIG. 12, and the values of the x component and the y component of the chromaticity coordinates are x = 0.592 and y =
0.280 red light was obtained.

In the second embodiment, a fluorescent plate (sample No. 95005) manufactured by Kawasaki Sanko Kasei was used for the fluorescent plate, and a yellow filter was used for the filter. As a result, FIG.
2 has a spectrum indicated by a dashed line, and the values of the x component and the y component of the chromaticity coordinates are x = 0.476, y
= 0.516 yellow light was obtained.

In the third embodiment, Acrylite (fluorescent color) product number 994 manufactured by Mitsubishi Rayon was used for the fluorescent plate, and a red filter was used for the filter. As a result, it has a spectrum indicated by a two-dot chain line in FIG. 12, and the values of the x component and the y component of the chromaticity coordinates are x = 0.386,
Red light with y = 0.133 was obtained.

In the fourth embodiment, a fluorescent plate (sample No. 95004) manufactured by Kawasaki Sanko Kasei was used as the fluorescent plate, and a yellow filter was used as the filter. As a result, FIG.
3 has a spectrum indicated by a solid line, and the values of the x component and the y component of the chromaticity coordinates are x = 0.473 and y =
A yellow light of 0.491 was obtained.

In the fifth embodiment, a fluorescent plate manufactured by Kawasaki Sanko Kasei (sample No. 90612) was used as the fluorescent plate, and a green filter was used as the filter. As a result, FIG.
3 has a spectrum indicated by a dashed line, and the values of the x component and the y component of the chromaticity coordinates are x = 0.131, y
= 0.630 green light was obtained.

As shown by the above experimental results, various colors of light can be obtained from the blue light of the light source by changing the type of fluorescent plate and filter used.

[0051]

According to the first aspect of the present invention, the light for optical display on the display surface side substantially consists only of the light of the second wavelength, and does not include the light of the first wavelength. because, it is possible to purely retrieve the color of the second wavelength of light the fluorescent plate is <br/> emission as the color of the light for display, resulting in superposition a plurality of types of light having different wavelengths as in the prior art As compared with a method of obtaining light of a desired color, a clear light color can be obtained.

In addition, receiving light of the first wavelength, light of various second wavelengths (for example, light of red, yellow, orange, green, etc.)
By preparing a plurality of types of fluorescent plates that emit light and a plurality of types of filters according to the type of the fluorescent plate, by selecting a fluorescent plate and a filter to be used according to a desired color of display light from among these. From the light of the first wavelength emitted by the light source, light of various colors that cannot be obtained by a single type of LED light emitting element can be obtained. As a result, the L used in accordance with the color of the display light as in the related art is used.
Compared to changing the combination of types of ED light emitting elements,
Productivity can be improved and cost can be reduced.

[0053]

According to the invention of claim 2 , the above-mentioned claim 1 is provided.
In addition to the effects of the invention, the fluorescent material is applied to the incident surface of the filter, so that the structure can be simplified by eliminating the need for using a fluorescent plate, and it is excellent in miniaturization and cost reduction. It works.

According to the third aspect of the present invention, since the light diffusing means for diffusing the light traveling from the light source to the display surface side is provided on the optical path, unnecessary light amount unevenness on the display surface is reduced. can do.

[0056]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a collective indicator light to which a first embodiment of a surface illuminated display device according to the present invention is applied.

FIG. 2 is an exploded perspective view of a unit indicator light constituting the collective indicator light of FIG.

FIG. 3 is a schematic sectional view of the unit indicator light of FIG. 2;

FIG. 4 is a schematic diagram showing optical characteristics of a fluorescent plate.

FIG. 5 is a perspective view showing an illuminated push button switch to which a second embodiment of the surface illuminated display device according to the present invention is applied;

FIG. 6 is a partial perspective exploded view of FIG. 5;

FIG. 7 is a schematic cross-sectional view showing a related technique of the surface illumination display device according to the present invention.

FIG. 8 is a diagram showing a state in which light of a first wavelength is converted into light of a second wavelength by the wavelength conversion plate of the related art .

FIG. 9 is a cross-sectional view showing a configuration of a filter in a third embodiment of the surface illumination display device according to the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a fluorescent plate and a filter in a fourth embodiment of the surface illumination display device according to the present invention.

FIG. 11 is a graph showing a spectrum of light emitted from a blue LED light emitting element.

FIG. 12 is a graph showing a spectrum of fluorescence (light of a second wavelength) obtained from light (light of a first wavelength) from a blue LED light emitting element.

FIG. 13 is a graph showing a spectrum of fluorescence (light of a second wavelength) obtained from light (light of a first wavelength) from a blue LED light emitting element.

[Explanation of symbols]

10a, 10b,..., 10i Unit indicator light (surface illumination display device) 12, 92 Light source 21, 82, 111 Fluorescent plate 23, 84, 101, 112 Filter 24 Milky white diffuser (light diffuser) 21a, 82a, 91a, 101a Incident surface 21b, 82b, 91b, 101b Emissive surface 40 Illuminated push button switch 54 LED unit light source 85 Hologram diffuser (diffusing means) 91 Wavelength converter (wavelength converter) 93 Base material FM, FMa, FMb Fluorescent material L1 First Light of one wavelength L2 Light of second wavelength

Continuation of the front page (56) References JP-A-3-98083 (JP, A) JP-A-2-158091 (JP, A) JP-A-3-17694 (JP, A) JP-A-6-149165 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G09F 13/04, 13/20

Claims (3)

(57) [Claims] 1. A plurality of blue LEDs arranged in a matrix and emitting light of a blue wavelength as light of a first wavelength.
An LED light source, an incident surface facing the LED light source and receiving light from the LED light source, and an emission surface facing a predetermined display surface side, wherein the first wavelength is incident through the incident surface. A fluorescent plate that emits light of a second wavelength longer than the first wavelength by the light of the above, and emits the light of the second wavelength from the emission surface; and a fluorescent plate interposed between the emission surface of the fluorescent plate and the display surface. A filter that removes the light of the first wavelength transmitted through the phosphor plate from light emitted from the emission surface, and transmits only the light of the second wavelength; and a filter of the second wavelength transmitted through the filter. A surface illuminated display device, wherein an optical display is performed on the entire display surface by light. 2. A light of a blue wavelength is emitted as light of a first wavelength.
Equipped with multiple blue LEDs arranged in a matrix that emits light
An LED light source, facing the LED light source, receiving light from the LED light source;
And a light-emitting surface facing a predetermined display surface.
And transmits only light of a second wavelength longer than the first wavelength.
A filter that is applied to the entrance surface of the filter and has the first wavelength.
A fluorescent material that receives light and emits light of the second wavelength;
Wherein the table by the light of the second wavelength transmitted through the filter
Surface illumination characterized by optical display over the entire display surface
Display device. 3. Proceeding from said LED light source to said display surface side.
Light diffusing means for diffusing the light on the optical path of the light.
The surface illumination according to claim 1, wherein the surface illumination is provided.
Optical display.