Light-emitting module

Abstract

We provide light-emitting modules that can reduce chromaticity and brightness unevenness. [Solution] In a light-emitting module having a plurality of light-emitting means 25 arranged in a matrix, each light-emitting means 25 has a first light-emitting member 252 and two second light-emitting members 253 arranged on opposite sides of the first light-emitting member 252 and emitting light of a different color from the first light-emitting member 252, and both the first light-emitting member 252 and each second light-emitting member 253 are rectangular, and the length 253a of the third side of each of the two second light-emitting members 253 parallel to the first direction X is within the range of 35% to 55% of the length 252a of the first side of the first light-emitting member 252 parallel to the first direction X, and furthermore, the sum of the areas of the two second light-emitting members 253 in each light-emitting means 25 is less than or equal to the area of ​​the first light-emitting member 252.

Description

Technical Field

[0001] The present invention relates to a light-emitting module, and more particularly to a light-emitting module using a light-emitting diode.

Background Art

[0002] Most of the current display light sources, such as mobile phones, computer monitors, televisions, and even large electronic billboards, use light-emitting diodes (LEDs). For example, as described in Patent Document 1, in order to obtain a vivid color effect, in addition to white LEDs that emit white light, LEDs that emit the three primary colors (red, green, and blue) are stacked and mixed, and the mixing ratio of LEDs with different emission colors is adjusted to represent a desired color type.

[0003] However, in order to achieve a good color mixing effect and provide a highly reproducible display result, it is necessary to use light sources of three colors: red (R), green (G), and blue (B). However, when these light sources are arranged on a display, dead spots often occur in the color stacking due to layout constraints, resulting in color unevenness and brightness unevenness, which affect the viewing quality of viewers.

[0004] Therefore, how to suppress color unevenness and brightness unevenness of the light source to obtain a good color mixing effect has become one of the directions of current industrial development.

Prior Art Documents

Patent Documents

[0005] [[ID=z29]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of the above problems, an object of the present invention is to provide a light-emitting module capable of reducing color unevenness and brightness unevenness. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a light-emitting module having a packaging case, wherein a plurality of light-emitting means are arranged in a matrix on the surface of the bottom plate of the packaging case along a first direction and a second direction which are orthogonal to each other. Each of the aforementioned light-emitting means comprises a first light-emitting member and two second light-emitting members, each positioned on opposite sides of the first light-emitting member in the first direction, and emitting light of a different color from the first light-emitting member. Both the first light-emitting member and each of the second light-emitting members are rectangular, and The length of the third side of each of the two second light-emitting members that is parallel to the first direction is within the range of 35% to 55% of the length of the first side of the first light-emitting member that is parallel to the first direction. Furthermore, the present invention provides a light-emitting module in which the sum of the areas of the two second light-emitting members in each of the light-emitting means is less than or equal to the area of ​​the first light-emitting member. [Effects of the Invention]

[0008] The present invention allows for more uniform mixing of light and reduces chromaticity and brightness unevenness in the light-emitting means by adjusting the ratio of the side lengths and arrangement of the first light-emitting member and each of the second light-emitting members. [Brief explanation of the drawing]

[0009] [Figure 1] This is a top view showing a first embodiment of the light-emitting module of the present invention. [Figure 2] This is a cross-sectional view of the same embodiment. [Figure 3] This is a top view showing the configuration of a single light-emitting means in the light-emitting module of the same embodiment. [Figure 4] This is a cross-sectional view showing an example of the configuration of fluorescent particles in the light-emitting means of the light-emitting module of the same embodiment. [Figure 5]This is a cross-sectional view showing another example of the configuration of fluorescent particles in the light-emitting means in the light-emitting module of the same embodiment. [Figure 6] This is a cross-sectional view showing yet another configuration example of fluorescent particles in the light-emitting means in the light-emitting module of the same embodiment. [Figure 7] This is a top view showing an example of a variation of the light-emitting module of the present invention. [Figure 8] This is a cross-sectional view showing a second embodiment of the light-emitting module of the present invention. [Modes for carrying out the invention]

[0010] To more clearly illustrate the object, technical means, and advantages of the embodiments of the present invention, the technical means in the embodiments of the present invention will be described clearly and in detail below, in conjunction with the accompanying drawings of the embodiments of the present invention. It will be clear that the embodiments described are some embodiments of the present invention, and not all embodiments. Typically, the components of the embodiments of the present invention depicted and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided below in the accompanying drawings does not constitute any limitation on the scope of protection of the present invention, but merely illustrates selected embodiments of the present invention.

[0011] Before explaining the present invention in detail, please note that in the following description, elements that perform the same role or function will be represented by the same number even if they do not have exactly the same configuration.

[0012] Furthermore, please note that in this specification, for the sake of explanation, terms such as "up," "down," "left," and "right," which indicate the relative positional relationships of each component, are used for explanatory purposes with reference to the examples in the drawings, and are not absolute terms that limit the configuration of the present invention.

[0013] Figs. 1 to 4 show a first embodiment of the light-emitting module 2 of the present invention. As shown in the figures, this light-emitting module 2 has a bottom plate 21, a peripheral wall 22 extending upward from the periphery of the bottom plate 21, a protective cover 23 disposed on the side of the peripheral wall 22 opposite to the bottom plate 21, and a plurality of light-emitting means 25. The bottom plate 21 and the peripheral wall 22 together define a hollow chamber 24 having an opening, and the protective cover 23 is made of a material through which light can pass and is disposed so as to cover the opening. The bottom plate 21, the peripheral wall 22, and the protective cover 23 together constitute a packaging case. Each light-emitting means 25 is disposed in the hollow chamber 24 and fixed to the bottom plate 21 so as to be arranged in a matrix along the first direction X and the second direction Y. And each light-emitting means 25 is electrically connected by a series connection, a parallel connection, or other methods.

[0014] The vertical distance between the surface of the protective cover 23 facing the light-emitting means 25 and the surface of the bottom plate 21 (that is, the surface of the bottom plate 21 on which the light-emitting means 25 are arranged) (in other words, the depth of the hollow chamber 24) is preferably 20 mm or more. Thereby, a sufficient space for light color mixing is provided, and color chromaticity unevenness and luminance unevenness can be reduced.

[0015] Specifically, each light-emitting means 25 has a substrate 251, two electrodes 251a formed on the substrate 251, a first light-emitting member 252, two second light-emitting members 253, a reflecting member 254, a packaging layer 256, fluorescent particles 257 contained in the packaging layer 256, and a plurality of leads 258. In all the light-emitting means 25, the arrangements of the first light-emitting member 252 and each second light-emitting member 253 are the same. In this embodiment, each light-emitting means 25 is arranged such that the first light-emitting member 252 and each second light-emitting member 253 are both arranged side by side along the first direction X.

[0016] The reflecting member 254 that reflects the light from the light-emitting means 25 as a light source is connected to the substrate 251 so as to surround the first light-emitting member 252 and each second light-emitting member 253, and defines a recessed portion 255 having an opening through which light is emitted on the side opposite to the substrate 251 together with the substrate 251. In this embodiment, the surface of the reflecting member 254 facing the first light-emitting member 252 and the second light-emitting members 253 is formed in a continuous curved shape, so that the light emitted from the first light-emitting member 252 and each second light-emitting member 253 can be uniformly reflected by the reflecting member 254. Therefore, the light can be more uniformly mixed, and the chromaticity unevenness and luminance unevenness of the light-emitting means 25 can be reduced.

[0017] The first light-emitting member 252 and each second light-emitting member 253 emit lights of different colors and are located in the recessed portion 255 and are electrically connected to the respective electrodes 251a by the respective leads 258.

[0018] In particular, by connecting the first light-emitting member 252 and each second light-emitting member 253 in series, a simple circuit can be realized.

[0019] Both the first light-emitting member 252 and each of the second light-emitting members 253 are rectangular in shape, and the two second light-emitting members 253 are arranged on both sides of the first direction X of the first light-emitting member 252, and the length 253a of the third side of each of the two second light-emitting members 253 parallel to the first direction X is within the range of 35% to 55% of the length 252a of the first side parallel to the first direction X of the first light-emitting member 252, and furthermore, the sum of the areas of the two second light-emitting members 253 in each light-emitting means 25 is less than or equal to the area of ​​the first light-emitting member 252. In this embodiment, an LED emitting green light is used as the first light-emitting member 252, and LEDs emitting blue light are used as each of the second light-emitting members 253, but this is merely an example, and it is possible to use LEDs emitting light of other colors. In Figure 1, an example configuration is shown in which the number of light-emitting means 25 arranged along the first direction X is greater than the number of light-emitting means 25 arranged along the second direction Y which is perpendicular to the first direction X. However, as shown in Figure 7, it is also possible to adopt a configuration in which the number of light-emitting means 25 arranged along the second direction Y is greater than the number of light-emitting means 25 arranged along the first direction X.

[0020] Furthermore, the length 253b of the fourth side of each second light-emitting member 253 parallel to the second direction Y can be set to be within the range of 90% to 120% of the length 252b of the second side of the first light-emitting member 252 parallel to the second direction Y, and it is more preferable that the sum of the areas of the two second light-emitting members 253 in each light-emitting means 25 is within the range of 70% to 100% of the area of ​​the first light-emitting member 252.

[0021] The package layer 256 can be made of a light-transmitting material such as epoxy resin or silicone, and the package layer 256 is filled into the recessed portion 255 so as to cover the first light-emitting member 252, each second light-emitting member 253, and each lead 258.

[0022] Each fluorescent particle 257 is arranged within the package layer 256 and is configured to emit light of a different color from the first light-emitting member 252 and each second light-emitting member 253. Specifically, the fluorescent particles 257 used in this embodiment are those that absorb light (green light and blue light in this embodiment) incident from the first light-emitting member 252 and each second light-emitting member 253, convert it into red light, and emit it. The material used as the fluorescent particle is, for example, KSF (fluoride red phosphor K2SiF6:Mn 4+ Examples include quantum dots or nitride phosphors.

[0023] Furthermore, as shown in Figures 4 to 6, the position in which each fluorescent particle 257 is placed within the package layer 256 can be varied by adjusting the manufacturing process.

[0024] For example, when forming the package layer 256 by solidifying the liquid packaging material, extending the solidification time of the liquid packaging material containing the fluorescent particles 257 allows the fluorescent particles 257 in the liquid packaging material to settle, so that, as shown in Figure 4, the fluorescent particles 257 in the package layer 256 are positioned closer to the surfaces of the substrate 251, the first light-emitting member 252, and each of the second light-emitting members 253.

[0025] Furthermore, by pre-dispersing each fluorescent particle 257 within the liquid packaging material, when the package layer 256 is formed from the liquid packaging material, the fluorescent particles 257 within the package layer 256 will be uniformly distributed as shown in Figure 5.

[0026] Furthermore, as shown in Figure 6, by first forming a first packaging material layer 256a in the lower part of the recessed portion 255 without fluorescent particles 257 using a liquid packaging material, and then forming a second packaging material layer 256b on the upper surface of the first packaging material layer 256a on which each fluorescent particle 257 is arranged, the fluorescent particles 257 in the package layer 256, which consists of the first packaging material layer 256a and the second packaging material layer 256b, are concentrated on the side closer to the aperture from which light is emitted.

[0027] In this invention, by designing the ratio of the side lengths and arrangement of the first light-emitting member 252 and each of the second light-emitting members 253, as well as the depth of the hollow chamber 24, the emission range from the first light-emitting member 252 to the opening can cover the emission range from each of the second light-emitting members 253 to the opening. This allows for more uniform mixing of light and reduces chromaticity and brightness unevenness of the light-emitting means 25.

[0028] In particular, since each first light-emitting member 252 and each second light-emitting member 253 of the light-emitting module 2 of the present invention emits light with a relatively short wavelength, such as green light or blue light, and emits red light with a relatively long wavelength when the fluorescent particle 257 is KSF, the light-emitting module 2 of the present invention can more precisely control the mixing of light.

[0029] In some embodiments, the color coverage of the light-emitting module 2 of the present invention meets certain color rendering index criteria. For example, the coverage of the Rec.2020 color space is 75% or more, the coverage of the DCI-P3 color space is 90% or more, the coverage of the sRGB color space is 97% or more, and the area ratio of the NTSC format is 100% or more.

[0030] As shown in Figure 8, a second embodiment of the light-emitting module 2 of the present invention may further have a lens 26 positioned on each light-emitting means 25 so as to face the surface of the protective cover 23.

[0031] Lens 26 can be a refractive lens or a reflective lens. By arranging each lens 26, the emission range of light from each light-emitting means 25 can be widened, and the configuration of the first light-emitting member 252 and each second light-emitting member 253 of each light-emitting means 25 maintains the effect of uniform light emission, thus solving the problem of chromaticity unevenness and brightness unevenness that conventional light-emitting means have, which worsen with the arrangement of lenses. The specific configurations of the refractive lenses and reflective lenses are prior art to those skilled in the art, so a detailed explanation will be omitted.

[0032] In summary, the light-emitting module 2 of the present invention, through the ratio of the side lengths and arrangement of the first light-emitting member 252 and each of the second light-emitting members 253, allows the emission range from the first light-emitting member 252 to the aperture to cover the emission range from each of the second light-emitting members 253 to the aperture. This enables more uniform color mixing of light and reduces chromaticity and brightness unevenness of the light-emitting means 25. Furthermore, by using an LED that emits green light as the first light-emitting member 252, an LED that emits blue light as each of the second light-emitting members 253, and KSF that emits red light as the fluorescent particles 257, all of which have short wavelengths, the light-emitting module 2 of the present invention has the advantage of excellent color rendering, and the objective of the present invention is reliably achieved.

[0033] Although embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications are possible without departing from its essence. [Explanation of Symbols]

[0034] 2 Light-emitting modules 21 Bottom plate 22 Peripheral wall 23 Protective cover 24 Hollow Chamber 25 Light-emitting means 251 circuit boards 251a Electrode 252 First light-emitting member 252a Length of the first side 252b Length of the second side 253 Second light-emitting element 253a Length of the third side 253b Length of the fourth side 254 Reflective material 255 Recessed area 256 package layers 256a First packaging material layer 256b Second packaging material layer 257 Fluorescent particles 258 Reeds 26 lenses X First direction Y Second direction

Claims

1. A light-emitting module having a packaging case, wherein a plurality of light-emitting means are arranged in a matrix on the surface of the bottom plate of the packaging case along a first direction and a second direction that are orthogonal to each other. Each of the aforementioned light-emitting means comprises a first light-emitting member and two second light-emitting members, each positioned on opposite sides of the first light-emitting member in the first direction, and emitting light of a different color from the first light-emitting member. Both the first light-emitting member and each of the second light-emitting members are rectangular, and The length of the third side of each of the two second light-emitting members that is parallel to the first direction is within the range of 35% to 55% of the length of the first side of the first light-emitting member that is parallel to the first direction. Furthermore, the light-emitting module wherein the sum of the areas of the two second light-emitting members in each of the light-emitting means is less than or equal to the area of ​​the first light-emitting member.

2. The light-emitting module according to claim 1, wherein the arrangement of the first light-emitting member and each of the second light-emitting members is the same in all of the light-emitting means.

3. The light-emitting module according to claim 1, wherein the length of the fourth side of each second light-emitting member parallel to the second direction is 90% to 120% of the length of the second side of the first light-emitting member parallel to the second direction.

4. The light-emitting module according to claim 1, wherein the sum of the areas of the two second light-emitting members in each of the light-emitting means is 70% to 100% of the area of ​​the first light-emitting member.

5. Each of the light-emitting means comprises a substrate on which the first light-emitting member and each of the second light-emitting members are arranged, A reflective member is connected to the substrate so as to surround the first light-emitting member and each of the second light-emitting members, and defines an aperture from which light is emitted on the side opposite to the substrate, The package layer covering the first light-emitting member and each of the second light-emitting members, The package layer comprises a plurality of fluorescent particles arranged within the package layer, The light-emitting module according to claim 1, wherein each of the fluorescent particles emits light of a different color from the first light-emitting member and each of the second light-emitting members.

6. The light-emitting module according to claim 5, wherein the surface of the reflective member facing the first light-emitting member is formed in a continuous curved shape.

7. The light-emitting module according to claim 1, wherein the packaging case has a peripheral wall extending upward from the outer edge of the bottom plate, and a protective cover positioned on the side of the peripheral wall opposite to the bottom plate and made of a material through which light can pass, and the bottom plate and the peripheral wall define a hollow chamber in which each of the light-emitting means is housed.

8. The light-emitting module according to claim 7, wherein the distance between the surface of the protective cover facing each of the light-emitting means and the surface of the bottom plate is 20 mm or more.

9. The light-emitting module according to claim 1, wherein each of the second light-emitting members of each of the light-emitting means is arranged on both sides of each of the first light-emitting members in the first direction.

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