JPH08320656A - Led light emitting display - Google Patents

Abstract

PURPOSE: To provide an LED light emitting display with which bright luminance is obtd., a display contrast is improved and display with good visibility is executable by providing this display with color filter parts capable of releasing most of the light emitted from LED light emitting elements outside through these parts and absorbing most of external light. CONSTITUTION: The LED light emitting elements 2 are housed in many through- holes 4a formed in a mask plate 4. A convex lens assembly plate 6 is adhered and fixed on the front surface side of this mask plate 4. Many convex lenses 6a are formed on the front surface of this convex lens assembly plate 6 in the positions corresponding to the respective through-holes 4a. The rear surfaces of the positions where the respective convex lenses 6a are formed in the convex lens assembly plate 6 are respectively coated with the color filter parts 7a of the same system color as the light emitting colors of the LED light emitting elements 2 in the respective through-holes 4a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED light emitting display using an LED [Light Emitting Diode] light emitting element installed in a bright place such as outdoors.

[0002]

2. Description of the Related Art FIG. 11 shows a structural example of a conventional LED light emitting display 1 using LED light emitting elements 2 of a plurality of light emitting colors.
The LED light emitting elements 2 are fixed to predetermined positions on the substrate 3, respectively. Then, a mask plate 4 is adhered and fixed to the front surface of the substrate 3, and each LED light emitting element 2 is housed in the bottom of a large number of through holes 4 a formed in the mask plate 4. The mask plate 4 has a front surface that is a light non-reflective surface such as black that suppresses the reflection of light, and also has a through hole 4
The inner peripheral surface of a is a light-reflecting surface such as white or silver.
In addition, a translucent sealing material 5 is filled and cured in each through hole 4a to seal the LED light emitting element 2 housed therein. On the front surface of the mask plate 4, a convex lens assembly plate 6 in which a large number of convex lenses 6a corresponding to each through hole 4a are formed is joined and fixed.

The light emitted from each LED light-emitting element 2 of the LED light-emitting display 1 is guided directly or after being reflected by the bottom surface or the inner peripheral surface of the through hole 4a of the mask plate 4, and then guided forward to form the convex lens collecting plate 6 It is condensed by the convex lens 6a and is emitted forward. Further, when external light entering from the outside reaches the surface of the mask plate 4 through the convex lens collecting plate 6, it is absorbed by the light non-reflecting surface. However, this external light is reflected by the convex lens 6a.
When entering the through hole 4a through the through hole, the light is reflected by the bottom surface and the inner peripheral surface and again passes through the convex lens 6a and is emitted to the outside. Therefore, the display contrast for distinguishing the lighting state and the extinguishing state of the LED light emitting element 2 is the brightness of the light emitted from the LED light emitting element 2 to the outside through the convex lens 6a (luminous intensity per unit area of the light emitting surface) and the external light. Is determined by the ratio with the brightness of the light when reflected by the inner peripheral surface of the through hole 4a and emitted again to the outside. When the LED light emitting display 1 is installed in a bright place, the light emission of the LED light emitting element 2 Since the external light is relatively strong with respect to the brightness, the display contrast is poor as it is.

Therefore, the conventional LE installed in a bright place
The D light emitting display 1 has a light transmittance of 40 to 40 between the front surface of the convex lens collecting plate 6 and the convex lens collecting plate 6 and the mask plate 4.
About 70% of smoke filters and brown filters were arranged. For example, when a smoke filter having a light transmittance of 50% is used, the brightness of the light emitted from the LED light emitting element 2 to the outside is reduced to 50% through the smoke filter, but the brightness of the light due to external light is reduced. Is reduced to 50% through the smoke filter at the time of incidence and is also reduced to 50% when reflected through the inner peripheral surface of the through hole 4a and passes through the smoke filter again, and is consequently emitted to the outside. Light is reduced to 25% (= 50% × 50%) of the incident light. Therefore, if such a smoke filter or a brown filter is used, the brightness of the light emitted from the LED light emitting element 2 is reduced, but the light emitted when the external light is reflected and emitted in the through hole 4a. Since the brightness is further reduced, this makes it possible to improve the display contrast.

[0005]

However, while the outside light becomes extremely strong in a particularly bright place such as outdoors, L
Since there is a limit to increase the light emission brightness of the ED light emitting element 2, it is difficult to obtain a sufficient display contrast in such a place even with the smoke filter or the brown filter. Further, if the light transmittance of the smoke filter or the brown filter is further reduced in order to increase the display contrast, the brightness of the light emitted from the LED light emitting element 2 becomes too low. Therefore, when the conventional LED light-emitting display 1 is installed in a particularly bright place such as outdoors, the absolute amount of the display brightness is insufficient and it is difficult to obtain a sufficient display contrast, and a display with good visibility can be performed. There was a problem that I could not do it.

In view of the above circumstances, it is an object of the present invention to provide an LED light emitting display body which can obtain sufficient display brightness and display contrast even in a bright place such as outdoors and has good visibility.

[0007]

In order to solve the above-mentioned problems, LED light emitting elements are arranged at predetermined positions on a substrate, and one LED light emitting element on the substrate is housed in front of the substrate. A convex lens is formed by arranging mask plates each having a through hole at a corresponding position, and forming convex lenses on the front surface of the mask plate in a one-to-one correspondence with the through holes of the mask plate. L with a collecting plate
In the ED light emitting display, a color filter of the same color as the light emitting color of the LED light emitting element housed in the through hole of the mask plate corresponding to each convex lens is provided on the back surface of each convex lens forming position on the convex lens collecting plate. It is characterized by being placed.

[0008]

According to the above construction, the light emitted from the LED light-emitting element on the substrate passes directly through the color filter, or is reflected by the inner peripheral surface of the through hole and then passes through the color filter, and is collected by the convex lens. It is illuminated and emitted forward. At this time, L
The light from the ED light emitting element becomes light of only the wavelength component corresponding to the emitted color, and the color filter through which this light passes also has the same color as this emitted color. Therefore, most of the light from the LED light emitting element is transmitted to the outside through the color filter with high transmittance.

External light entering from the outside passes through the convex lens and the color filter, is reflected by the inner peripheral surface of the through hole, and is again emitted to the outside through the color filter and the convex lens.
However, since the outside light is usually white light containing wavelength components of various colors, when passing through the color filter twice, most wavelength components other than the color of the color filter are absorbed. Therefore, most of the incident light of this outside light is absorbed by the color filter, and only a small amount of light is emitted to the outside.

As a result, the LED light emitting display of the present invention is
Since most of the light emitted from the LED light emitting element passes through the color filter and is emitted to the outside, a bright display brightness can be obtained without impairing the light emitting brightness of the LED light emitting element. Moreover, most of the light incident from the outside is absorbed by the color filter and only a small amount of light is emitted to the outside, so that the display contrast can be improved.

When the LED light emitting elements on the substrate all have the same emission color, the color filters provided on the back surface of the convex lens assembly plate also have the same color. On the other hand, when using the LED light emitting elements of a plurality of light emitting colors, the color of each color filter may differ depending on the light emitting color of the corresponding LED light emitting element. In the case of using the LED light emitting elements of a plurality of such emission colors, an LED light emitting element for full color display using the LED light emitting elements of the RGB three primary colors and an LED light emitting element of red and green light emitting colors are used. LE used for displaying red, green and orange
There are D light emitting display and the like.

By the way, when the same color as the color filter of the present invention is applied to the surface or inside of each convex lens of the convex lens collecting plate, the same effect as above can be obtained. However, in this case, when the light emitted from one convex lens is viewed from an oblique direction, the more oblique the viewing position is, the more the light is occluded by the adjacent convex lenses of other colors, and the visibility becomes worse. That is, for example, as shown in FIG.
When the light A emitted from the D light emitting element 2 is obliquely emitted from the convex lens 6a, the red component is absorbed when passing through the adjacent green convex lens 6a.
The red light A cannot be seen from the oblique direction shielded by a. Therefore, in the present invention, the color filter is arranged on the back side of the convex lens assembly plate to prevent the visibility in the oblique direction from being deteriorated.

Further, the LED light-emitting display body of the present invention is such that one LED light-emitting element is housed in each through hole of the mask plate. LED to be housed in each through hole in this way
If the number of light emitting elements is limited to one, the inner peripheral surface of each through hole is
It is possible to form the LED light emitting element into such a shape and size that it can be reflected forward as efficiently as possible.

[0014]

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

FIGS. 1 to 9 show an embodiment of the present invention. FIG. 1 is a partial vertical cross-sectional view of an LED light emitting display,
2 is a partial rear view of the convex lens collecting plate coated with a filter film, FIG. 3 is a partial plan view of an LED light emitting display, and FIG. 4 is an exploded perspective view of a large-screen display device using the LED light emitting display. 6 is a longitudinal sectional view of the display device shown in FIG.
Is a front view showing another example of use of the LED light emitting display, FIG. 7 is a vertical sectional view of the LED light emitting display shown in FIG. 6, and FIG.
FIG. 9 is a partial perspective view of another large-screen display device using the D light emitting display body, and FIG. 9 is a circuit diagram showing the wiring of each LED light emitting element of the LED light emitting display body of FIG. The constituent elements having the same functions as those of the conventional example shown in FIG.

The LED light-emitting display 1 of this embodiment is RGB
(Red, green and blue) LED light emitting element 2 for each of the three primary colors
An arrangement in which a large number of are arranged will be described. As shown in FIG. 1, one LED light emitting element 2 is wire-fixed to each predetermined position on the front surface of the substrate 3. These LED light emitting elements 2 are regularly arranged so that the adjacent ones emit different colors. The substrate 3 is a copper-clad laminate having a glass fiber reinforced epoxy resin plate as a base material and a conductive pattern formed by means such as etching.
The D light emitting element 2 is connected and fixed to a predetermined position on the substrate using a conductive paste, and is wire-bonded and wired.

A mask plate 4 is bonded and fixed to the front surface of the substrate 3. The mask plate 4 is a plate-shaped rubber elastic molded product such as silicone rubber or a heat-resistant plastic molded product having a thickness of about 0.7 to 1.0 mm, and corresponds to each LED light emitting element 2 on the substrate 3. A large number of through holes 4a
Is provided. Therefore, by bonding and fixing the mask plate 4, each LED light emitting element 2 on the substrate 3 is housed one by one in the bottom portion of the through hole 4a. Each through hole 4a of the mask plate 4 is formed in a mortar shape in which the back side is made as narrow as possible and the front side is sufficiently widened in order to efficiently reflect and emit the light from the LED light emitting element 2 to the front side, and the inner circumference The surface is a light-reflecting surface such as white or silver.
Therefore, by making the area of the bottom of each through hole 4a, that is, the area of the surface of the substrate 3 as small as possible, most of the light emitted from the LED light-emitting element 2 housed here is reflected by the light reflection surface of the inner peripheral surface. It is efficiently released to the front. This light-reflecting surface may be coated with a white or silver-based paint later, but it can also be easily formed by previously mixing a white-based pigment (such as titanium oxide) in the mask plate. can do. In addition, a translucent sealing material 5 such as silicone rubber is filled and cured in each through hole 4a to seal the LED light emitting element 2 housed inside.

A convex lens collecting plate 6 is bonded and fixed to the front surface of the mask plate 4. The convex lens assembly plate 6 is a rubber elastic molded product such as a transparent silicone rubber or a synthetic resin molded product having a flat back surface of about 0.3 to 0.5 mm, and is joined and fixed to the front surface of the mask plate 4. At this time, a large number of convex lenses 6a that project in a substantially hemispherical shape on the front side are formed at positions corresponding to the through holes 4a on a one-to-one basis. Each convex lens 6a has a lens diameter that is approximately twice the diameter of the opening on the front side of the through hole 4a, and is arranged so as to be substantially concentric with the through hole 4a. In this case, it goes without saying that the curvature diameter, shape, size, etc. of the convex lens may be designed and arranged so as to obtain desired light distribution characteristics. The mask plate 4 and the sealing material 5 are preferably made of a rubber elastic body such as silicone having a large effect of absorbing and relaxing thermal stress.

On the back surface of the convex lens assembly plate 6,
The filter film 7 is coated. Filter membrane 7
As shown in FIG. 2, each of the convex lenses 6a is concentric with the convex lens 6a and has a diameter of ½ of the lens diameter.
The color filter portion 7a is formed in the above circular area. The color filter portion 7a is a color filter that efficiently transmits only light of the same color as the light emitting color of the LED light emitting element 2 in the corresponding through hole 4a when the convex lens collective plate 6 is bonded and fixed to the front surface of the mask plate 4. Is. Then, in the region of the filter film 7 other than the color filter portion 7a, a light non-reflective film portion 7b of black or the like that suppresses transmission and reflection of light is formed. Such a color coating or black coating of the color filter portion 7a and the light non-reflective film portion 7b can be easily performed by a relatively simple method such as screen printing or letterpress printing because the back surface of the convex lens assembly plate 6 is a flat surface. Can be formed. If the front surface of the mask plate 4 is a light non-reflective surface due to the application of black paint or the like, the light non-reflective film portion 7b is not necessary and nothing is coated here. Alternatively, the color filter portion 7a for each color is formed so as to extend to this area. The filter film 7 may be coated by painting or the like, a film forming the color filter portion 7a of each color may be attached to the back surface of the convex lens 6a, or the color filter portion 7a of each color may be formed in advance in each predetermined area. The above film may be attached to the back surface of the convex lens assembly plate 6. This color filter section 7
Ideally, a is an element that transmits all wavelength components of the light emitted by the corresponding LED light-emitting element 2 and blocks all other wavelength components, but such a complete color filter is prepared. LED light emitting element 2
Any color filter having a similar color may be used as long as the average transmittance of the wavelength component of the light emitted by the is sufficiently higher than the average transmittance of the other wavelength components.

Each LED of the LED light-emitting display 1 having the above-mentioned configuration
The light emitted from the light emitting element 2 directly passes through the color filter portion 7a of the filter film 7 or the through hole 4a of the mask plate 4.
The light passes through the color filter portion 7a after being reflected by the inner peripheral surface thereof, is condensed by the convex lens 6a of the convex lens assembly plate 6, and is emitted forward. At this time, each color filter portion 7a
Since each is a color filter which efficiently transmits only the light of the emission color of the corresponding LED light emitting element 2, most of the light emitted from this LED light emitting element 2 is emitted to the outside. In addition, external light incident from the outside of the LED light-emitting display 1 passes through the convex lens 6a and the color filter portion 7a, is reflected by the inner peripheral surface of the through hole 4a, and is again colored.
It is emitted to the outside through a and the convex lens 6a. But,
Since this outside light is usually white light containing wavelength components of all colors, almost all wavelength components other than the color of the color filter portion 7a are absorbed when passing through the color filter portion 7a twice. Moreover, even for the wavelength component of the same color as that of the color filter portion 7a, the actual transmittance of this color filter portion 7a is less than 100%, so that it is higher than the light emitted from the LED light emitting element 2 due to the double transmission. It is absorbed by the match. Therefore, most of the incident light of this outside light is absorbed by the color filter portion 7a, and only a small amount of light is emitted to the outside.

As described above, according to the LED light emitting display 1 of this embodiment, the color filter portion 7a of the filter film 7 coated on the back surface of the convex lens collecting plate 6 is L.
Since most of the light emitted from the ED light emitting element 2 is transmitted and emitted to the outside, a bright display brightness can be obtained when the LED light emitting element 2 is turned on. Moreover, most of the light incident from the outside is absorbed by the color filter portion 7a, and only a small amount of light is emitted to the outside.
The brightness of the display unit when the D light emitting element 2 is turned off is sufficiently low. Therefore, even when the LED light emitting display 1 is installed outdoors in a bright environment, a high display contrast and a bright display brightness can be obtained.

In the LED light-emitting display body 1 having the above-described structure, the display portion formed by the through hole 4a accommodating the red light-emitting LED light-emitting element 2 and the convex lens 6a becomes a red (R) light-emitting region, and the green light-emitting LED light-emitting element 2 is The display portion including the through hole 4a and the convex lens 6a accommodated becomes a green (G) light emitting area, and the display portion including the through hole 4a and the convex lens 6a accommodating the blue LED light emitting element 2 becomes a blue (B) light emitting area. . Then, as shown in FIG. 3, a plurality of light emitting areas 8 for each of the three primary colors of RGB are collected to form a display dot area 9 such as a circle.
And a large number of the display dot areas 9 are arranged in a matrix, it is possible to form a large dot matrix type screen by color display. FIG.
Is an LED in which a large number of such display dot areas 9 are arranged.
This is an example of a display device having an 8 × 8 dot structure, in which the light emitting display bodies 1 are further arranged vertically and horizontally and a light shielding louver 10 is attached to the front side thereof. The light-shielding louver 10 is provided with openings 10a at positions corresponding to the respective display dot areas 9, and light-shielding eaves plates 10b projecting obliquely downward are provided above the openings 10a arranged in the horizontal direction. . The light-shielding eaves plate 10b is for preventing strong external light such as direct sunlight from above from directly irradiating the LED light emitting display body 1. And LED
By mounting this light-shielding louver 10 on the front surface of the light emitting display body 1, as shown in FIG. 5, a large number of convex lenses 6a of the convex lens assembly plate 6 are connected to the display dot area 9 through the opening 10a.
Each of them constitutes an indicator that is projected. Further, a large-screen display device is obtained by arranging a large number of such display devices.

6 and 7 show another example of use of the LED light emitting display body 1 of this embodiment. In this case,
The substrate 3, the mask plate 4, and the convex lens assembly plate 6 are formed into a circular shape having substantially the same diameter, and a plurality of light emitting regions of each color (LED light emitting element 2, through hole 4a and convex lens 6a) are arranged therein to form a single unit. Consists of display dots. This LE
The D light-emitting display body 1 is fitted into substantially the center of a cylindrical case frame body 11 having an eaves-like shape with its front end cut obliquely so as to shield external light from above. It has become. By arranging a large number of the LED light emitting display bodies 1 in a matrix, it is possible to configure a large screen of a dot matrix system in which each LED light emitting display body 1 is used as a display dot.

FIG. 8 and FIG. 9 show still another example of use of the LED light emitting display body 1 of this embodiment. In this case, as shown in FIG. 8, the substrate 3, the mask plate 4, and the convex lens assembly plate 6 are formed in a horizontally long rectangular shape, and a plurality of light emitting regions of each color (only the convex lens 6a is shown in FIG. 8) are provided therein. A plurality of arranged display dot areas 9 such as a square are provided in a horizontal row to form a display device. As shown in FIG. 9, assuming that each LED light emitting element 2 here has two colors, for example, red light emission and green light emission, the red light emitting LED is provided for each display dot area 9.
The light emitting element 2R and the green light emitting LED light emitting element 2G are connected in series. Therefore, this LED light emitting display 1
Controls the lighting of the LED light-emitting element 2 for each display dot area 9 and also L in the same display dot area 9.
Lighting can be controlled for each emission color of the ED light emitting element 2.

As shown in FIG. 8, the LED light emitting display 1 is fixed to the front surface of a horizontally long mounting frame 12. Further, a frame body 13 having an opening for each display dot area 9 is attached to the front surface of the LED light emitting display body 1 fixed to the attachment frame 12, and the attachment frame 12 is attached.
A hood frame 14 for blocking the irradiation of external light from above is provided at the upper end of the so as to form a display device having a plurality of dots in one horizontal line. This display has a vertical back wall 15
It is installed by attaching to. By arranging a large number of the display devices in the vertical and horizontal directions and arranging the display dot areas 9 in a matrix, a large screen of the dot matrix system can be constructed.

[0026]

As is apparent from the above description, in the LED light emitting display of the present invention, most of the light emitted from the LED light emitting element passes through the color filter and is emitted to the outside, but most of the external light is emitted. Is absorbed by this color filter, so that it is possible to obtain a bright display luminance, improve the display contrast, and perform display with good visibility.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, which is an LED
It is a partial longitudinal cross-sectional view of a light emitting display.

FIG. 2 shows an embodiment of the present invention and is a partial rear view of a convex lens assembly plate coated with a filter film.

FIG. 3 shows an embodiment of the present invention, in which an LED
It is a partial top view of a light emitting display body.

FIG. 4 shows an embodiment of the present invention, in which an LED
FIG. 7 is an exploded perspective view of a large-screen display device using a light emitting display body.

5 is a vertical sectional view of the display device shown in FIG. 4, showing an embodiment of the present invention.

FIG. 6 shows an embodiment of the present invention, in which an LED
It is a front view which shows the other usage example of a light emitting display body.

7 is a longitudinal sectional view of the LED light emitting display body shown in FIG. 6, showing an embodiment of the present invention.

FIG. 8 shows an embodiment of the present invention, in which an LED
It is a partial perspective view of another large-screen display device using a light emitting display.

9 is a circuit diagram showing an embodiment of the present invention and showing wiring of each LED light emitting element of the LED light emitting display body of FIG. 8. FIG.

FIG. 10 is a partial vertical cross-sectional view of an LED light-emitting display body for explaining the operation of the present invention.

FIG. 11 is a partial vertical cross-sectional view of an LED light emitting display, showing a conventional example.

[Explanation of symbols]

 1 LED light emitting display 2 LED light emitting element 4 Mask plate 4a Through hole 6 Convex lens assembly plate 6a Convex lens 7 Filter film 7a Color filter part

Claims (1)

[Claims] 1. An LED light emitting element is arranged at a predetermined position on a substrate, and an LE on the substrate is provided on the front surface of the substrate.
D: A mask plate having a through hole is arranged at a position for accommodating one light emitting element, and a convex lens corresponding to each through hole of the mask plate is provided on the front surface of the mask plate. In an LED light-emitting display in which a convex lens collecting plate formed so as to project to the side is arranged, each convex lens is housed in a corresponding through hole of the mask plate on the back surface of the convex lens collecting plate at the position where each convex lens is formed. An LED light-emitting display body, in which a color filter having a color similar to that of the LED light-emitting element is arranged.