CN102943970A - Light-emitting diode (LED) emitting device coated with dyes - Google Patents

Abstract

A dye-coated LED light-emitting device, comprising at least one light source and a body made of transparent material, the plate body includes a light-emitting surface and a light-incident surface, the light source is arranged opposite to the light-incidence surface, and several microstructures are distributed on the light-emitting surface , the microstructure is a bump with multiple faces, and each of the multiple faces of the microstructure is coated with a dye of a different color. The LED light-emitting device makes observers observe different colors of light at different positions.

Description

A kind of LED lighting device coated with dye

technical field

The invention relates to a dye-coated LED light-emitting device, which belongs to the technical field of LED flat panel display and lighting.

Background technique

LED light-emitting devices are widely used in fields such as advertising signs and traffic signs, and can also be used as lighting displays for instrument panels. CN101469825B and US8002455B2 disclose a LED light-emitting panel, including a plurality of microstructures, by coating the same color dyes on the microstructures of the same display group, and coating different color dyes on the microstructures of different display groups, so that The luminous panel can display information with rich colors, and by switching the luminous color of the light source, different information can be displayed at different times on the same panel. This patent is an improvement on this patent, which is incorporated herein by reference in its entirety.

Contents of the invention

One aspect of the present invention provides a dye-coated LED lighting device, which has the functions described in CN101469825B and US8002455 B2, and the color of the light emitted by the LED lighting device can change with the position of the observer And change.

For the realization of the above functions, the present invention provides a dye-coated LED light-emitting device, which includes at least one light source and a body made of transparent materials. , several microstructures are distributed on the light-emitting surface, and the microstructures are coated with dyes for absorbing light of a color different from that of the dyes. It is characterized in that: the microstructures are bumps with multiple surfaces, and the light source Used to switchably provide at least two different colors of monochromatic light, the dye is a dye of a different color coated on each of the multiple faces of the microstructure, and the color of the dye is selected from the at least The color of two different colors of monochromatic light. Through the above technical solution, when the light source irradiates a variety of monochromatic lights of different colors, each surface of the microstructure is coated with dyes of different colors, and different surfaces can emit light of different colors at different angles, so that the observer can see the light at different angles. The colors of light observed at different locations are different.

The previous solution requires the light source to emit monochromatic light of at least two colors at the same time. As an improvement to the previous solution, according to another aspect of the present invention, a dye-coated LED lighting device is provided, which only needs the light source to emit One color of monochromatic light, that is, the color of the light emitted by the LED lighting device can be changed as the position of the observer changes.

For the realization of the above functions, the present invention provides a dye-coated LED light-emitting device, which includes at least one light source and a body made of transparent materials. , several microstructures are distributed on the light-emitting surface, and the microstructures are coated with dyes for absorbing light of a color different from that of the dyes. It is characterized in that: the microstructures are bumps with multiple surfaces, and the light source For switchably providing monochromatic light of at least one color, each of the multiple surfaces of the microstructure is coated with a different fluorescent material, and the fluorescent material is used to convert the monochromatic light emitted by the light source into Monochromatic light of another wavelength, the dye is a dye of the same color as the monochromatic light of another wavelength coated on the outside of the fluorescent material. Through the above technical solution, the monochromatic light is converted into monochromatic light of another wavelength by the fluorescent material. At the same time, by setting the color of the dye to the same color as the excited monochromatic light, only the excited light can Through the light-emitting device, only one color of monochromatic light can be used, that is, the light emitted by the LED light-emitting device can change with the change of the observer's position.

According to another aspect of the present invention, in the solution above, the light-emitting panel is a cuboid structure, the light incident surface is located on one bottom surface of the cuboid, and the light exit surface is located on the other bottom surface of the cuboid opposite to the light incident surface.

According to another aspect of the present invention, in the solution above, the light-emitting panel has a rectangular parallelepiped structure, the light incident surface is located on one side of the rectangular parallelepiped, and the light emitting surface is located on a bottom surface of the rectangular parallelepiped.

According to another aspect of the present invention, in the above solution, the light-emitting panel is a cuboid structure, the light-incident surface is located on one side of the cuboid, the light-emitting surface is a bottom surface of the cuboid, and on the other side opposite to the light-emitting surface A microstructure is arranged on one bottom surface, so that the other bottom surface becomes another light-emitting surface. Through such an arrangement, the light-emitting panel can realize double-sided light emission, so that observers can see the content of the light-emitting panel on both the front and back sides, and by setting different microstructure distributions on the front and back sides, the front side of the reflective panel can be made And the reverse side can display different content.

According to another aspect of the present invention, a light-emitting panel is provided, including at least one light source and a board body made of transparent material, the board body includes a light-emitting surface and a light-incident surface, the light source is arranged opposite to the light-incidence surface, and the light-emitting surface Several microstructures are distributed on the surface, and the feature is that the light source is used to switchably provide at least one monochromatic light of different colors. The several microstructures form a plurality of display groups, and at least one display group is coated with For the fluorescent material of the wavelength, the dye of the same color as the excited monochromatic light is coated on the display group coated with the fluorescent material, and the dye of the same color as the light source is coated on the display group not coated with the fluorescent material. With such an arrangement, when the light source only provides monochromatic light of one color, different groups can display different colors.

According to another aspect of the present invention, in the above solution, the material of the board body is one of polymethyl methacrylate, polycarbonate, resin material, glass, silicone, and epoxy resin.

According to another aspect of the present invention, in the above solution, the light source includes at least one monochromatic solid-state light emitting element.

According to another aspect of the present invention, in the above solution, the monochromatic light solid-state light-emitting element is one of red light, orange light, yellow light, green light, indigo light, blue light, and purple light LED.

According to another aspect of the present invention, in the above solution, the dye is a light-transmitting dye.

According to another aspect of the present invention, in the above solution, a layer of material with high reflectivity is plated on the position where there is no microstructure on the surface of the panel to form a reflective layer.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a light emitting device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a microstructure according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a microstructure according to another embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention.

Detailed ways

The LED lighting device will be further described below with reference to the accompanying drawings. Furthermore, it should be understood that the features of the various embodiments described herein are not mutually exclusive and can exist in various combinations and permutations.

As shown in Figure 1, the LED lighting device coated with dye includes a light source 1 and a plate body 2 made of transparent material. The plate body 2 includes a light-emitting surface 3, a bottom surface 4 opposite to the light-emitting surface 3, a side surface 5 between the light-emitting surface 3 and the bottom surface 4, and several microstructures located on the light-emitting surface 3, and the microstructures are bumps 6. The board material can be polymethyl methacrylate (PMMA), polycarbonate (PC), resin material (resin), glass (glass), organic silicon (silicone), epoxy resin (epoxy) and other polymers, The light transmittance reaches at least 70%, and the refractive index can be 1.4-1.7. The LED lighting device adopts the form of a side light source, the side 5 is the light incident surface, the light incident surface is adjacent to the light exit surface 3 , and the light source 1 is arranged opposite to the side surface 5 . The light source 1 includes a plurality of monochromatic solid-state light-emitting elements of different colors, and can switchably provide at least two monochromatic lights of different colors, such as red light, orange light, yellow light, green light, indigo light, blue light or purple LED , and its installation form can be SMD (SMD) and so on. The light emitted by the light source 1 is incident into the plate body 2 through the side surface 5 of the plate body 2, and propagates in the plate body 2. Based on the principle of total reflection, the light will reciprocate in the plate body 2 . The light-emitting surface 3 of the LED lighting device is distributed with several bumps 6. The bumps 6 are in the shape of multiple surfaces, such as triangular pyramids, quadrangular pyramids, regular tetrahedrons, cubes, etc. The bumps 6 destroy the original shape. Some smooth planes do not have total reflection, so when the light touches the bump 6, it will pass through the LED light emitting device.

Fig. 2 has shown the structure of bump 6 in a kind of embodiment, and the different faces of bump 6 are coated with the dyestuff 61,62 of different colors, and the color of the dyestuff of this different color is selected from the single of different colors that light source provides. The color of shade, when light passes through a dye of a single color, light of a color different from the dye is absorbed by the dye, and light of the same color as the dye is filtered out of the dye. For example, 61 on the left side of the bump 6 is red dye, and 62 on the right side of the bump 6 is yellow dye. When the light source 1 includes a red LED and a yellow LED, when the red light emitted by the red LED passes through the bump 6, The red light can filter out the left side of the bump 6, and its exit angle is α ₁ , while the yellow light emitted by the yellow LED cannot pass through the left side of the bump 6; the yellow light emitted by the yellow LED passes through the bump 6, the yellow light can filter out the right side of the bump 6, and its emission angle is α ₂ , while the red light emitted by the red LED cannot pass through the right side of the bump 6 . In this way, the red LED and the yellow LED of the light source are turned on at the same time. In the area A with only red light, the observer sees only red light; in the mixed area B of red light and yellow light, the observer sees red light. Orange light mixed with yellow light; and in region C where there is only yellow light, the observer sees yellow light.

Fig. 3 shows the structure of the bump 6 in another embodiment. The difference from Fig. 2 is that fluorescent materials 611 and 621 are coated before the dyes 61 and 62. The fluorescent materials 611 and 621 are used to convert the monochromatic light emitted by the light source into monochromatic light of another wavelength, and the colors of the dyes 61 and 62 are the colors of the monochromatic light excited by the fluorescent materials 611 and 621 respectively. For example, the light source 1 includes a blue LED, the fluorescent material 611 is a material that converts blue light into red light, and 61 is a red dye; the fluorescent material 621 is a material that converts blue light into yellow light, and 62 is a yellow dye. In this way, as long as the blue LED with only one monochromatic light is turned on, it can be realized. In the area A with only red light, the observer sees only red light; in the mixed area B of red light and yellow light, the observer sees is orange light mixed with red and yellow light; and in region C where there is only yellow light, the observer sees yellow light.

Fig. 4 shows another embodiment of the present invention, as shown in Fig. 4, the LED lighting device that is coated with dye comprises light source 1, plate body 2 that transparent material is made, and plate body 2 is cuboid structure, and this plate body 2 It includes a light-emitting surface 31 located on the side of the plate body, another light-emitting surface 32 opposite to the light-emitting surface 3, a side surface 5 between the light-emitting surface 31 and the light-emitting surface 32, and several microstructures 6 located on the light-emitting surfaces 31 and 32. Preferably, the microstructure 6 can be a concave point, a convex point or a combination of a concave point and a convex point, and the shape of the concave point or the convex point can be a cone, a triangular pyramid, a quadrangular pyramid, a regular tetrahedron, a cube, a hemisphere shape etc. Through such an arrangement, the light-emitting device can realize double-sided light emission, so that the observer can see the content of the light-emitting device on both the front and back sides, and by setting different microstructure distributions on the front and back sides, the front side of the light-emitting device can be made And the reverse side can display different content.

In order to make the light pass through the microstructure as much as possible without leaking from other places, a layer of high reflectivity material, such as mercury, Al, Ag, Au, Cu, etc., can be plated on the position where there is no microstructure on the surface of the panel to form reflection layer.

The bumps in the above embodiments can be made by lithography, that is, according to the required text or pattern shape, dot design, make a negative, then print the negative on the surface of the light-emitting surface, and finally bake or irradiate with ultraviolet rays. Thus forming bumps. The bumps in the above embodiments can also be formed by molding.

The pits in the above embodiments can be realized by performing semiconductor processing methods on the surface, such as etching, laser engraving, embossing, and the like. The so-called etching method includes the following steps: first, cover a layer of protective film on the light-emitting surface; secondly, remove the protective film in the area to be etched through exposure plate making and development; finally, add a chemical solution to the area where the protective film is removed to achieve dissolution and corrosion. , thus forming pits.

In addition, those skilled in the art can also make other changes within the spirit of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims (9)

1. A dye-coated LED light-emitting device, comprising at least one light source, a plate body made of transparent materials, the plate body includes a light-emitting surface and a light-incident surface, the light source is arranged opposite to the light-incidence surface, and several light sources are distributed on the light-emitting surface A microstructure coated with a dye that absorbs light of a different color than the dye. 2. A dye-coated LED light-emitting device according to claim 1, wherein the microstructure is a bump with multiple surfaces, and the light source is used to switchably provide at least two different colors monochromatic light, the dye is a dye of a different color coated on each of the plurality of faces of the microstructure, and the color of the dye is selected from the colors of the monochromatic light of at least two different colors. 3. A dye-coated LED lighting device according to claim 1, wherein the microstructure is a bump with multiple surfaces, and the light source is used to switchably provide at least one color Monochromatic light, each of the multiple surfaces of the microstructure is coated with a different fluorescent material, the fluorescent material is used to convert the monochromatic light emitted by the light source into monochromatic light of another wavelength, the The dye is a dye of the same color as the monochromatic light of another wavelength coated on the outside of the fluorescent material. 4. A dye-coated LED light-emitting device according to claim 2 or 3, wherein the light-emitting panel is a cuboid structure, the light-incident surface is located at a bottom surface of the cuboid, and the light-emitting surface is located at the bottom of the cuboid The upper surface is opposite to the other bottom surface of the incident surface. 5. A dye-coated LED light-emitting device according to claim 2 or 3, characterized in that: the light-emitting panel is a cuboid structure, the light-incident surface is located on the side of the cuboid, and the light-emitting surface is located on the side of the cuboid a base. 6. A dye-coated LED lighting device according to claim 4 or 5, characterized in that: the material of the board is polymethyl methacrylate, polycarbonate, resin material, glass, silicone , One of the epoxy resins. 7. A dye-coated LED lighting device according to claim 6, wherein the light source comprises at least one monochromatic solid-state light-emitting element. 8. A dye-coated LED light-emitting device according to claim 8, characterized in that: said monochromatic solid-state light-emitting element is red light, orange light, yellow light, green light, indigo light, blue light, purple light One of the LEDs. 9 . The dye-coated LED lighting device according to claim 8 , wherein the dye is a light-transmitting dye.

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