CN1716046A - Planar light source device with secondary light guide - Google Patents

Abstract

A planar light source device with secondary light guidance includes a light source generating device, wherein the light source generating device includes at least two light-emitting components or two light-emitting components that can generate light of different colors; a light mixing device, which preliminarily mixes the light generated in the light source generating device to substantially generate a mixed line light source; and a planar light source generating device, wherein the planar light source generating device includes a light-scattering portion for receiving the mixed line light source and generating a planar light source.

Description

Planar light source device with secondary light guide

technical field

The invention relates to a planar light source device, in particular to a planar light source device with secondary light guide.

Background technique

Flat display devices such as liquid crystal displays are non-self-illuminating displays. Therefore, another device needs to provide a planar light source. This type of planar light source device is usually called a backlight assembly (Backlight). Backlight components can generally be divided into two types: direct light source type (Back Light Type) and side light source type (Edge Light Type); traditional direct light source type backlight components include lamps such as cold cathode tubes, diffusion However, in order to disperse the light uniformly to provide an appropriate light source for the liquid crystal display, it is necessary to precisely control the distance between each light source and the distance between the light source and the diffuser and prism to avoid uneven illumination distribution. The components of the side light source type backlight assembly need to add a light guide plate in addition to the components of the above-mentioned direct light source type backlight assembly to diffuse the light. However, the side light source type backlight assembly still has the problem of uneven illuminance distribution. question. In addition, the components formed by the above two backlight components are too complicated, which is also a problem in terms of manufacturing cost and component complexity.

In order to overcome the above problems, a side light-emitting diode is disclosed in Taiwan Patent No. 541726, which includes a light-emitting diode package and a lens. By means of the lens, the light emitted from the light-emitting diode package passes through the lens again The guide is horizontal and side light, combined with the light guide plate to redirect it. However, because the components are too complex, there is still a problem in terms of manufacturing cost.

In Taiwan Patent Publication No. 575722, a backlight assembly is disclosed, which includes a plurality of linear light sources, such as lamp tubes, or a plurality of point light sources, such as light-emitting diodes, a light guide plate, and multilayer optical films, such as diffusion sheets and A prism sheet, the light guide sheet has a plurality of grooves at its bottom for accommodating lamp tubes; Light enters the light guide plate and is diffused therein by total reflection. However, this component is only suitable for monochromatic light sources. If point light sources of different colors, such as red, green and blue light-emitting diodes, are mixed to produce white light as a backlight source, the backlight source produced by the above-mentioned backlight component will produce Inhomogeneous color mixing or partial light concentration occurs; besides, there are still problems in terms of manufacturing cost and component complexity.

Contents of the invention

The inventor of this case obtained an inspiration when thinking about how to solve the problems of the prior art, and thought that if a planar light source device with secondary light guiding is provided, a light mixing device is used to preliminarily mix light-emitting diodes of different colors into one After the one-line light source, a planar light source is generated by the planar light source generating device.

The planar light source device with secondary light guide of the present invention includes: a light source generating device, wherein the light source generating device includes at least two light emitting components or two light emitting components that can generate light of different colors; a light mixing device, the mixing The light device is used to initially mix the light generated in the light source generating device so that it generally generates a mixed line light source; the planar light source generating device, wherein the planar light source generating device includes a device for receiving the mixed light source and generating a plane The astigmatism of the light source.

Description of drawings

Figure 1a is a schematic diagram showing a planar light source device with secondary light guiding according to a preferred embodiment of the present invention;

Fig. 1b is a schematic diagram showing the cross section of the light source generating device and the light mixing device of the present invention;

Fig. 1c is a schematic diagram showing a light mixing device in an embodiment of the present invention;

Fig. 2a is a schematic diagram showing a planar light source device with secondary light guiding according to another preferred embodiment of the present invention;

Fig. 2b is a schematic diagram showing the cross-section of a light source generating device and a light mixing device in another embodiment of the present invention;

Fig. 3a is a schematic diagram showing a planar light source device with secondary light guiding according to another preferred embodiment of the present invention;

Fig. 3b is a schematic diagram showing a light source generating device and a light mixing device in another embodiment of the present invention.

Explanation of reference symbols:

10 light source generating device

101 light emitting components

102 light-emitting components

103 light-emitting components

11 light mixing device

111 Department of Astigmatism

112 Department of Astigmatism

113 Department of Astigmatism

12 planar light source generators

121 reflective layer

13 Department of Astigmatism

131 reflective layer

21 light mixing device

211 Department of Astigmatism

212 Department of Astigmatism

213 Department of Astigmatism

22 planar light source generators

23 Department of Astigmatism

231 reflective layer

21 light mixing device

32 planar light source generating device

321 reflective layer

33 Department of Astigmatism

331 reflective layer

Detailed ways

Example 1

Referring to Fig. 1a, it is a cross-sectional view along the x-axis direction of a planar light source device 1 with secondary light guiding according to a preferred embodiment of the present invention, including: a light source generating device 10, wherein the light source generating device includes red, Light-emitting components 101, 102, and 103 for green and blue light rays; a light mixing device 11, which is used to initially mix the light generated in the light source generating device to generally generate a mixed line light source; The light source generating device 12, the lower part of the planar light source generating device 12 is an arc-shaped surface, the lower part of the planar light source generating device 12 includes a reflective layer 121, and the reflective layer 121 is used to generate The light at the bottom of the device can be reflected back to the planar light source generating device to enhance light mixing efficiency. The upper part of the planar light source generating device includes a light scattering part 13 for receiving the mixed line light source and generating a plane light source. The structure of the light scattering part 13 can be a groove, and the shape of the groove can be V-shaped, U-shaped or At least one shape made of waves or other alternative shapes is represented by a V-shaped groove in this embodiment; The side is an optically sparse medium, such as: air, etc., which will produce total reflection (Total Internal Reflection; TIR) at a certain angle. For example: when the groove is V-shaped, its angle is θ degrees; the critical angle of the material of the light mixing plate is θc degrees, then total reflection will occur when θ<2×(90-θc), similarly, when the concave When the shape of the groove is U-shaped or wavy, it will also produce total reflection at a certain angle to achieve the effect of astigmatism. In addition, a reflective layer 131 can also be formed on the V-shaped groove, which can also enhance its astigmatism effect.

Referring to FIG. 1b, it is a cross-sectional view of a structure of the above-mentioned light mixing device along the y-axis direction. The light mixing device includes a plurality of light-scattering parts 111, 112 and 113, and the number of light-scattering parts is substantially equal to the number of light source generating devices. ; As shown in Figure 1c, the structure of the astigmatism part can be a groove, and the shape of the groove can be at least one shape composed of V-shape, U-shape or wave shape or other alternative shapes. In the example, it is represented by a V-shaped groove; with the principle of the above-mentioned astigmatism part 13, when the light from the light source generating device travels to the astigmatism part, the light can be dispersed to both sides of the light mixing device 11 through the astigmatism part, so that each light source generates The light generated by the device is scattered to the side and mixed with each other to achieve the purpose of light mixing. The V-shaped grooves of the above-mentioned light-scattering parts 111, 112, and 113 and the V-shaped grooves of the light-scattering part 13 exist in a non-parallel state, preferably in a state where the two are perpendicular to each other. The flat light source produced by the device has the most uniform color mixing.

Example 2

Referring to Fig. 2a, it is a sectional view of a planar light source device 2 with secondary light guiding according to another preferred embodiment of the present invention, comprising: a light source generating device 10, a light mixing device 21, and the light mixing device 21 is used To preliminarily mix the light generated in the light source generating device to generally generate a mixed line light source; a planar light source generating device 22, wherein the upper part of the planar light source generating device 22 is two slopes and an astigmatism part inclined from outside to inside 23, used to receive the mixed line light source and generate a planar light source, the lower part of the planar light source generating device 22 includes a reflective layer, and the reflective layer is used to energy the light emitted to the bottom of the planar light source generating device Reflected back to the planar light source generating device to enhance light mixing efficiency. The structure of the diffusing part 23 is a groove, and the shape of the groove can be at least one shape formed by V-shape, U-shape or wave shape or other alternative shapes. In this embodiment, the V-shaped groove is used represent. In addition, a reflective layer 231 can also be formed on the V-shaped groove, which can also enhance its astigmatism effect.

Referring to Fig. 2b, it is another structural cross-sectional view of the above-mentioned light mixing device, the light mixing device includes a plurality of astigmatism parts 211, 212 and 213, and the structure of the light mixing parts 211, 212 and 213 of the light mixing device is a cone As shown in Figure 2c, the number of the astigmatism parts is roughly equal to the number of light source generating devices, when the light from the light source generating device travels to the astigmatism part, the light can be dispersed to the side of the light mixing device 21 through the astigmatism part In this way, the light generated by each light source generating device is scattered to both sides and then mixed with each other to achieve the purpose of light mixing.

Example 3

As shown in Figure 3a, it is a cross-sectional view along the x-axis direction of a planar light source device 3 with secondary light guiding according to another preferred embodiment of the present invention, including: a light source generating device 10, a light mixing device 31, The light mixing device 31 is used to preliminarily mix the light generated in the light source generating device so that it generally produces a mixed line light source; a planar light source generating device 32, wherein the top of the planar light source generating device 32 is inclined from outside to inside It is composed of two slopes and astigmatism part 33, which is used to receive the mixed line light source and generate a plane light source. Layer 321, the reflective layer 321 is used to reflect the light directed towards the bottom of the planar light source generating device back to the planar light source generating device, so as to enhance light mixing efficiency. In addition, a reflective layer 331 can also be formed on the light-diffusion portion 33 to enhance its light-diffusion effect.

Referring to Fig. 3b, the light source generating device is embedded in the uniform light mixing device, which can reduce the light loss caused by the light generated by the light source generating device passing through the air to the uniform light mixing device.

In order to improve light mixing efficiency, in each of the above-mentioned embodiments, a reflective layer may also be included around the light mixing device to reflect the light from the side of the light mixing device projected by the light source generating device back to the light mixing device to enhance mixing. Light efficiency; Similarly, the lower plane of the above-mentioned light source generating device can also form a reflective layer to guide the light back to the uniform light mixing device. The shape of the reflective layer can be a U-shaped concave surface, further improving the reflection layer efficiency.

In addition, there may also be a printed distributed pattern on the side of the uniform light mixing device. With this pattern, the incident light generated by the light source generating device can be pre-mixed with each other through reflection and/or refraction.

In the above-mentioned embodiments, the light source generating device 10 can be various light sources, such as light-emitting diodes, fluorescent lamps, incandescent bulbs or halogen bulbs, etc., wherein the light source generating device includes at least two light-emitting components or two light sources that can generate light of different colors. The light emitting component and the light source generating device can be arranged periodically or in groups to generate a uniform light source.

The reflective plate mentioned above may be a metal layer, a mirror, or other devices or surface treatments that can generate light reflection. The material of the light mixing device can be acrylic resin (Acrylic Resin), cycloolefin polymer (COC), polymethyl methacrylate (PMMA), polycarbonate (PC), polyetherimide (Polyetherimide), fluorocarbon Polymer (Fluorocarbon Polymer) or silica gel (Silicone) constitutes at least one material in the material group or other alternative materials; the material of the planar light source generating device or the light mixing plate can be used as the material of the light mixing device, here No more details; the above-mentioned light source generating device can also be equipped with a heat dissipation device outside to achieve the function of heat dissipation; when the above-mentioned planar light source device with secondary light guide is applied to a large-size flat-panel display, it can be matched and combined with multiple The planar light source device for secondary light guide makes it form an array, so as to facilitate the utilization of large-size flat-panel displays.

The above are only preferred embodiments of the present invention, the scope of the present invention is not limited to these preferred embodiments, and any changes made according to the present invention all belong to the scope of the claims of the present invention, so any Those of ordinary skill in the technical field can of course make any changes without departing from the scope and spirit of the claims of the present invention.

Claims (27)

1. planar light source device with secondary leaded light comprises:

One light-source generation device, wherein this light-source generation device comprises at least two luminescence components;

One light mixing device, this light mixing device makes it produce a blend light source substantially in order to the light that is produced in this light-source generation device of preliminary mixing;

One planar light-source generation device, wherein this flat light source generation device comprises one in order to receive this blend light source and to produce the astigmatic portion of a planar light source.

2. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: this light-source generation device is a point-like light source.

3. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: comprise an astigmatic portion in the structure of this light mixing device.

4. the planar light source device with secondary leaded light as claimed in claim 3 is characterized in that: the quantity of this astigmatism portion equals the quantity of this light-source generation device.

5. the planar light source device with secondary leaded light as claimed in claim 3 is characterized in that: this astigmatism portion is a groove.

6. the planar light source device with secondary leaded light as claimed in claim 5 is characterized in that: the profile of this groove can be V-arrangement, U-shaped or the wavy at least a shape that constitutes or other replaceable shape.

7. the planar light source device with secondary leaded light as claimed in claim 3 is characterized in that: this astigmatism portion be for a circular cone inward recess cave-shaped.

8. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: there is the distributed graphic of a printing in the side of this light mixing device.

9. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: this astigmatism portion is a groove.

10. the planar light source device with secondary leaded light as claimed in claim 9 is characterized in that: the profile of this groove can be V-arrangement, U-shaped or the wavy at least a shape that constitutes or other replaceable shape

11. the planar light source device with secondary leaded light as claimed in claim 3 is characterized in that: the astigmatic portion on this reflecting plate and the astigmatic portion of flat light source generation device are orthogonal.

12. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: also have one around this flat light source generation device in order to limit the advance reflection horizon of direction of one of this mixing light.

13. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: on this astigmatism portion, also comprise a reflection horizon.

14. the planar light source device with secondary leaded light as claimed in claim 13 is characterized in that: this reflection horizon can produce the device or the surface-treated surface of light reflection for metal level, minute surface or other.

15. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: this light-source generation device outside also has a heat abstractor in order to the function that reaches device radiation.

16. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: around this light mixing device, also comprise a reflection horizon.

17. the planar light source device with secondary leaded light as claimed in claim 16 is characterized in that: this reflection horizon can produce the device or the surface-treated surface of light reflection for metal level, minute surface or other.

18. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: the bottom of this flat light source generation device is an arcwall face.

19. the planar light source device with secondary leaded light as claimed in claim 18 is characterized in that: this arcwall face can be a reflection horizon.

20. the planar light source device with secondary leaded light as claimed in claim 19 is characterized in that: this curved reflecting surface can produce the device or the surface-treated surface of light reflection for metal level, minute surface or other.

21. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: two luminescence components of this light-source generation device produce the light of different colours.

22. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: the lower plane of this light-source generation device comprises a reflection horizon.

23. the planar light source device with secondary leaded light as claimed in claim 22 is characterized in that: this reflection horizon can produce the device or the surface-treated surface of light reflection for metal level, minute surface or other.

24. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: this light-source generation device can embed in this light mixing device.

25. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: the material of this light mixing device can be at least a material or other the replaceable material in acryl resin, cyclic olefin polymer, polymethylmethacrylate, polycarbonate, polyethers vinegar imines, fluorocarbon polymer or the silica gel institute constituent material cohort.

26. the planar light source device with secondary leaded light as claimed in claim 1 is characterized in that: the material of this flat light source generation device can be at least a material or other the replaceable material in acryl resin, cyclic olefin polymer, polymethylmethacrylate, polycarbonate, polyethers vinegar imines, fluorocarbon polymer or the silica gel institute constituent material cohort.

27. the planar light source device with secondary leaded light as claimed in claim 4 is characterized in that: the material of this light mixing plate can be at least a material or other the replaceable material in acryl resin, cyclic olefin polymer, polymethylmethacrylate, polycarbonate, polyethers vinegar imines, fluorocarbon polymer or the silica gel institute constituent material cohort.

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