JPH01260707A - Device for emitting white light - Google Patents

Abstract

PURPOSE:To enable pure white light to be obtained by transparent light by means of color mixing by letting a device be composed of LED, a transparent glass body which is dyeing agent penetrating and is high in transparency wherein each of dyeing agents of two color composing three primary colors formed by color mixing of luminous color from LED is penetrated into the respective front and rear surfaces of the glass body, and of a case which supports the glass body while letting it be faced with the luminous section of LED. CONSTITUTION:In a case 4 made of an insulating resin raw material formed into a box shape, the inner circumferential surface of a recessed section 4a wherein a red color LED 2 is embedded, is composed of an inclined surface the face of which is covered with a reflective film so as to be used as a reflector 3. The glass body 1 is composed of polymerizable fluid polymer including monomer, or oligomer, or mixture thereof which includes compound in a bisallyle family as an essential ingredient so as to be formed into a plane shape. In addition, a blue dyeing agent 11 and a green dyeing agent 12 are penetrated into the front and the rear surfaces of the glass body 1 respectively over an appropriate range. This constitution thereby permits the three primary colors by color mixing to be formed so that pure white light can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [a) Field of Industrial Application This invention relates to a display device using an LED, and particularly to a six-color light emitting device that emits white light to display a display.

(b) Conventional Technology When a large number of display lamps are used to display operating conditions on an operation panel, display lamps of multiple colors are required to distinguish them from each other, and display lamps that emit white light may be required. Therefore, some conventional display lamps are equipped with a diffuser plate such as an opaque milky white resin plate in front of the filament lamp. As a result, the light emitted from the filament lamp is diffused in the diffuser plate to obtain white light.

(C) Problems to be Solved by the Invention However, since the above-mentioned conventional display lamp uses a filament lamp as a light source, it consumes a large amount of power.
In addition, since heat generation is significant, the filament lamp tends to break and lamp replacement becomes complicated. Also,
Because white light was obtained by diffusing light with a diffuser plate,
Unlike the white light obtained by additively mixing the three primary colors of red, green, and blue, only an indistinct white color with a yellowish tinge was obtained.

The purpose of this invention is to obtain a white color by additively mixing the emitted light color of the LED and the dye color on the front and back surfaces of a transparent glass body having dye permeability and high light transmittance, thereby reducing power consumption and heat generation. It is an object of the present invention to provide a white light emitting device that can reduce the amount of light used, eliminate the need for replacement work, and obtain pure white light through additive color mixing using transmitted light.

(Means for Solving Problem d1) The white light emitting device of the present invention has an LED and each of two color dyes that constitute three primary colors of additive color mixture with the emitted light color of this LED permeated from each of the front and back surfaces. It is characterized by being constructed of a transparent glass body that is permeable to dyes and highly translucent, and a case that holds this glass body facing the light emitting part of the LED.

Moreover, the transparent glass body may be used as a hollow sealing body of the LED.

Furthermore, two LEDs that emit light in each of the two primary colors of the additive color mixture are stacked and arranged, and the dye of the remaining one of the three primary colors is infiltrated into the surface of the sealing body made of the transparent glass body. Alternatively, a fluorescent dye may be used as the dye. is a dye-permeable transparent glass body, and two-color dyes are permeated from each of the front and back surfaces.

These two colors of dye constitute the three primary colors of the additive color mixture together with the emitted light colors of the LED. The dye penetrating the glass body reflects external light, and the direction of the light reflection is equal to the light distribution direction of the white light of the LED. Therefore, when looking at the glass body from the outside, the LE
The three colors, the luminescent color D and the two dye colors, are mixed and appear to be white light.

The above effect is the same even when the transparent glass body impregnated with the above-mentioned two-color dyes is used as a hollow sealing body of an LED.

Furthermore, when two LEDs that emit light in two of the three primary colors of the additive color mixture are arranged in a stacked manner, the mixed light of the two colors is distributed above them. When these two LEDs are sealed with a transparent glass body having dye permeability and high light transmittance, the mixed light of the two colors is transmitted through the transparent glass body. At this time, if the transparent glass body is infiltrated with the remaining dye of the three additive primary colors, the light of the three additive primary colors will be mixed and distributed on the outside of the transparent glass body, resulting in white light. appear.

When a fluorescent dye is used as the dye that permeates the transparent glass body, the state of light mixing becomes better.

(f) Embodiment FIG. 1 is a side sectional view of a white light emitting device which is an embodiment of the present invention.

A red LED 2 is embedded inside a case 4 molded into a box shape from an insulating resin material. This red LE
D2 is exposed in the recess 4a of the case 4. This recess 4
A flat glass body 1 is fixed to the outer edge of a.

Further, the inner peripheral surface of the recess 4a is constituted by an inclined surface whose surface is coated with a reflective coating, and serves as a reflector 3. Further, lead wires 2a and 2b of the red LED 2 are exposed to the outside via a resistor 5.

FIG. 2 is a side sectional view of a transparent glass body that constitutes a part of the white light emitting device.

The glass body 1 is formed into a flat plate of a polymerizable liquid material containing a monomer or oligomer containing a bisallyl compound as an essential component, or a mixture thereof. The polymerizable liquid containing a bisallyl compound as an essential component or an oligomer or a mixture thereof is preferably a bis(allyl carbonate) monomer or oligomer of an aliphatic, cycloaliphatic or aromatic dihydric alcohol. Or a composition containing a mixture thereof and a polymerization initiator. Examples of this include a copolymer of nuclear/logen-substituted henzhendicarboxylic acid with sialylene glycol diallyl carbonate, described in JP-A No. 59-45312; One or more esters of rogane-substituted benzene dicarboxylic acid (for example, bisallyl 2,4-dichloroterephthalate, etc.) and a radically polymerizable aromatic ring-containing monopolymer with a refractive index of 1.55 or more as a homopolymer. Functional monomers (e.g. phenyl methacrylate)
A copolymer with one or more of the following, a type of specific bisallyl carbonate or bisβ-methylallyl carbonate (e.g. 1,4-bis(hydroxyethoxy)benzenebisallyl carbonate, etc.) described in JP-A-59-8710. A copolymer of the above and one or more radically polymerizable aromatic ring-containing monofunctional monomers (such as phenyl methacrylate) having a refractive index of 1°55 or more as a homopolymer, JP-A-59 -96109, a monomer prepared by reacting a monool (e.g. 4-benzyl-phenol) with an unsaturated carboxylic acid (chloride) (e.g. acrylic acid (chloride)) and a homopolymer having a refractive index of 1 Copolymers with radically polymerizable monomers of .55 or more (e.g. styrene), allyl esters of chlorobenzoic acid (e.g. diallyl 2,3-dichlorobenzoic acid) described in JP-A-59-96113; Copolymers with functional monomers (e.g. diallyl ester of tetrabromophthalic acid), copolymers described in JP-A-59-184210, diethylene glycol bisallyl carbonate and the general formula (wherein R is a dihydric alcohol) (the value of n or the average value of n is from 1 to 10, preferably from 2 to 10)
Contains a bis(allyl carbonate) monomer or oligomer of an aliphatic, alicyclic or aromatic dihydric alcohol represented by: or a mixture thereof a. Component a is
Preferably, the reaction product is a molar ratio of diallyl carbonate to divalent alcohol of 4:1 or less, more preferably 2:1.

The dihydric alcohol is preferably ethylene glycol,
1,3-propanediol, 1,4-butanediol,
1.6-hexanediol, diethylene glycol, polyethylene glycol, dipropylene glycol, propylene glycol, neopentyl glycol, trimethylbentanediol, cyclohexane dimetatool, bis(hydroxymethyl)tricyclodecane, 2.7-norbornanediol, α, α′-xylene diol, 1
, 4-bis(hydroxyethoxybenzene) and 2.
One or more types of 2-bis(4-(hydroxyethoxy)phenyl)propane are used.

Any polymerization initiator may be used, such as a photopolymerization initiator, a thermal polymerization initiator, a photo/thermal polymerization initiator, or a combination thereof.

In addition to photopolymerization initiators, photopolymerization initiators include electron beam and radiation polymerization initiators.

As a photopolymerization initiator, for example, 2-hydroxy-2-
Methyl-1-phenyl-propan-1-one is mentioned.

Examples of thermal polymerization initiators include peroxydicarbonates such as diisopropyl peroxydicarbonate, disecandabutyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, tertiary butyl perbenzoate, benzoyl peroxide, acetyl peroxide, etc. Organic peroxides such as diacyl peroxides and
Examples include radical initiators such as azobisisobutyronitrile.

Examples of the photo-thermal polymerization initiator include compounds of the following formula.

The amount of polymerization initiator used is 0°1 to 1 liter relative to the sealant.
The transparent glass body 1 having the above composition of Qwt%, preferably 1 to 6 wt%, has dye permeability, and when the temperature of the glass body 1 is increased, the distance between the molecules constituting the glass body 1 increases, and the dye The dye penetrates between the molecules. Thereafter, when the temperature is cooled to room temperature, the molecular spacing is again narrowed, and the staining agent is sealed inside the glass body 1. glass body 1
The vicinity of both the front and back surfaces are dyed blue and green due to the above-mentioned dye permeability property. That is, 2 g/I of each of the blue and green stains! Blue and green dyeing solutions are prepared by dissolving them in water at the following ratios, and the temperature is raised to approximately 83°C. The front and back surfaces of the glass body 1 are immersed in the blue and green dyeing solutions thus prepared for an appropriate time. As a result, the front and back surfaces of the glass body 1 are coated with a blue stain 11 and a green stain 1, as shown in the cross-sectional view of FIG.
2 penetrate into appropriate ranges. Further, the glass body having the above composition has a high light transmittance of about 98%.

When the red LED 2 of the white light emitting device configured as described above is driven, the red light from the red LED 2 passes through the glass body 1 having sufficient transparency and is distributed to the outside. Further, the blue and green dyes that have penetrated into the inside of the glass body 1 reflect external light, and this reflected light is distributed in the same direction as the red light of the LED 2.

As a result, on the outside of the white light emitting device, the three colors red, green, and blue, which constitute the three primary colors of additive color mixture, are mixed and perceived as white light.

In this example, the dye-permeable transparent glass body was formed into a flat plate shape, but this transparent glass body may also be used as a hollow sealing body for an LED, as shown in FIG. In this case, the hollow sealing body 31 shown in the figure is formed by molding a glass body having the composition described above into a hollow shape, and then impregnating each of the two colors of the three additive primary colors into the outer and inner surfaces. If this hollow sealing body 31 covers the LED 32 that emits the remaining one of the three primary colors, when the light emitted from the LED 32 permeates through the hollow sealing body 31, the three primary colors of additive color mixture will be mixed, and the hollow sealing White light is obtained outside the body 31. For example, red L
When ED is used, blue and green dyes are permeated into the front and back surfaces of the hollow sealing body 31, respectively. Also, red LE
When a green LED is used instead of D, the same effect can be obtained by infiltrating the front and back surfaces of the hollow sealing body 31 with blue and red dyes, respectively.

Furthermore, as shown in FIG. 5, LEDs 42a and 42b that emit light in two of the three additive primary colors are stacked and arranged.

42b is sealed with a glass body having the above composition to form the sealing body 41, and then a white light emitting device may be constructed by infiltrating the sealing body 41 with a single color dye of the remaining three primary colors. In this case, as shown in FIG. 5, the GaP green LED 41a and the GaAs
The electrodes 51 and 52 are bonded to the ED 41b using a silver paste 53. At this joint surface, electrode 51.
52 is partially arranged, red LED 4 l b
The light passes through the green LED 41a, and the light passes through the green LED 41a.
The light is distributed upward along with the light. At this time, the sealing body 41
By impregnating the surface with blue dye, white light can be obtained by mixing the three primary colors in an additive mixture. L.E.
In D41a and 41b, part of the light emitted is distributed in the horizontal direction, but about 70% is distributed upward, thereby making it possible to obtain white light.

Note that the transparent glass body 1, the hollow sealing body 31, and the sealing body 4
When a fluorescent dye is used as the dye to be infiltrated into 1, the state of additive color mixing becomes better and the visibility of white light becomes higher.

(g) Effect of the Invention According to the invention described in Claims 1 and 2, additive color mixing is achieved by the two-color dyes that have penetrated into the front and back surfaces of the glass body or the inside and outside surfaces of the hollow sealing body and the light emitted from the LED. White light can be obtained by composing the three primary colors. This white light is clear white light obtained by light transmitted through the transparent glass body of the LED. Furthermore, by using LEDs, it is possible to reduce power consumption and eliminate the need to replace lamps due to broken filaments.

Further, according to the invention described in claim 3, white light can be obtained by forming three primary colors in an additive color mixture by the light emission of the two-color LEDs arranged in a stacked manner and the dye permeated into the sealing body. In this case, after sealing the two-color LED, the sealed body can be immersed in a dye to produce a white light emitting device, and the manufacturing process thereof can be simplified.

Furthermore, according to the invention described in claim 4, by using the fluorescent dye, it is possible to improve the mixing state with the emitted light color of the LED.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a white light emitting device which is an embodiment of the invention as claimed in claim 1, FIG. 2 is a sectional view of a transparent glass body constituting a part of the white light emitting device, and FIG. The figure is a side sectional view showing a white light emitting device which is an embodiment of the invention as claimed in claim 2. Further, FIG. 4 is a side view showing a white light emitting device as an embodiment of the invention as claimed in claim 3, and FIG. 5 is a diagram showing the configuration of an LED of the same white light emitting device. 1-Transparent glass body, 2-Red LED. 4-Case, 11-Blue dye, 12-Green dye, 31-Hollow sealed body, 41- Sealed body.

Claims (4)

[Claims] (1) A dye-permeable and highly translucent transparent glass body in which an LED and two color dyes constituting the three additive primary colors of the LED's emitted light are permeated from the front and back surfaces, respectively; A white light emitting device characterized by comprising: a case that holds the glass body facing the light emitting part of the LED; (2) Hollow part of a transparent glass body with dye permeability and high translucency, in which the LED and the two color dyes constituting the three primary colors of the additive color mixture are permeated from the front and back surfaces respectively. A white light emitting device comprising: a sealing body; (3) Two stacked LEDs that emit two colors from each of the three primary colors in the additive color mixture, and dye penetrating and high light transmittance that allows the remaining one color of the three primary colors in the additive color mixture to penetrate from the surface. 1. A white light-emitting device comprising: a sealed transparent glass body; (4) The white light emitting device according to any one of claims 1 to 3, wherein the dye is a fluorescent dye.