Light emitting structure

Abstract

The invention provides a light-emitting structure. The light-emitting structure comprises a substrate, at least one light-emitting chip, a reflecting layer, a packaging adhesive, a reflective polarizer and a polarization conversion element, the light-emitting chip is disposed on the substrate, and the reflecting layer is disposed on the substrate. The packaging adhesive wraps the light-emitting chip and covers the reflecting layer. The reflective polarizer is disposed on the packaging adhesive, and the polarization conversion element is disposed on or in the packaging adhesive. The reflective polarizer is used for allowing light with a first polarization direction in the light emitted by the light-emitting chip to pass through and reflecting light with a second polarization direction in the light, and the polarization conversion element is used for changing the polarization direction of the light reflected by the reflective polarizer.

Description

Technical Field

[0001] The invention relates to a light-emitting structure. Background Art

[0002] In the prior art, the method of generating polarized light source is to use an absorbing polarizer or an absorbing polarizer to generate linear polarized light, which is to add an absorbing polarizer or an absorbing polarizer directly in front of the non-polarized light source to filter the non-polarized light into linear polarized light. However, this method will cause the energy of the light to be reduced by half.

[0003] In addition, if uniform polarized light is to be generated, a certain light mixing distance is required, so it is difficult to achieve a thin light source device, and the entire light source device is likely to be bulky. Summary of the invention

[0004] The present invention is directed to a light emitting structure which has higher light efficiency and has the advantages of being thin and lightweight.

[0005] One embodiment of the present invention provides a light-emitting structure, including a substrate, at least one light-emitting chip, a reflective layer, a packaging glue, a reflective polarizer, and a polarization conversion element. The light-emitting chip is disposed on the substrate, and the reflective layer is disposed on the substrate. The packaging glue encapsulates the light-emitting chip and covers the reflective layer. The reflective polarizer is disposed on the packaging glue, and the polarization conversion element is disposed on or in the packaging glue. The reflective polarizer is used to allow light with a first polarization direction in the light emitted by the light-emitting chip to pass through, and is used to reflect light with a second polarization direction in the light, and the polarization conversion element is used to change the polarization direction of the light reflected by the reflective polarizer.

[0006] One embodiment of the present invention provides a light-emitting structure, including a light guide plate, at least one light-emitting element, a light-transmitting layer, a reflective polarizer, and a first reflective layer. The light guide plate has a first surface, a second surface opposite to the first surface, and at least one light incident surface connecting the first surface and the second surface, wherein the second surface is provided with a light scattering microstructure layer. At least one light-emitting element is disposed beside at least one light incident surface and emits light toward at least one light incident surface. The light-transmitting layer is disposed on the first surface, wherein the refractive index of the light-transmitting layer is lower than the refractive index of the light guide plate. The light-transmitting layer is disposed between the light guide plate and the reflective polarizer. The first reflective layer is disposed on the second surface.

[0007] In the light-emitting structure of the embodiment of the present invention, a reflective polarizer is used to allow the light with a first polarization direction in the light emitted by the light-emitting chip to pass through, and to reflect the light with a second polarization direction in the light, and a polarization conversion element is used to change the polarization direction of the light reflected by the reflective polarizer, so that more light has the first polarization direction and can pass through the reflective polarizer. Therefore, the light-emitting structure of the embodiment of the present invention can have a higher light efficiency. In addition, in the light-emitting structure of the embodiment of the present invention, the reflective polarizer is configured on the packaging glue, so the light-emitting structure can be thinner and have a lighter weight. In the light-emitting structure of the embodiment of the present invention, the light-transmitting layer is configured on the first surface of the light guide plate, the light-transmitting layer is configured between the light guide plate and the reflective polarizer, and the second surface of the light guide plate is provided with a light scattering microstructure layer, so that the light reflected by the reflective polarizer can change the polarization direction by being scattered by the light scattering microstructure layer, thereby increasing the proportion of light passing through the reflective polarizer. Therefore, the light-emitting structure of the embodiment of the present invention can have a higher light efficiency. In addition, in the light emitting structure of the embodiment of the present invention, a reflective polarizer is configured above the first surface of the light guide plate, so the light emitting structure can be thinner and lighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a cross-sectional schematic diagram of a light emitting structure according to an embodiment of the present invention;

[0009] Figure 2 is a cross-sectional schematic diagram of a light emitting structure according to another embodiment of the present invention;

[0010] Figure 3A is a top view schematically showing a light emitting structure according to another embodiment of the present invention;

[0011] Figure 3B for Figure 3A A cross-sectional schematic diagram of a light-emitting structure;

[0012] Figure 4 is a cross-sectional schematic diagram of a light emitting structure according to yet another embodiment of the present invention;

[0013] Figure 5 is a cross-sectional schematic diagram of a light emitting structure according to another embodiment of the present invention;

[0014] Figure 6 is a cross-sectional schematic diagram of a light emitting structure according to another embodiment of the present invention;

[0015] Figure 7 is a cross-sectional schematic diagram of a light emitting structure according to yet another embodiment of the present invention;

[0016] Fig. 8A is a top view schematically showing a light emitting structure according to another embodiment of the present invention;

[0017] Figure 8B for Fig. 8A A side view schematic diagram of a light emitting structure;

[0018] Fig. 9 is a cross-sectional schematic diagram of a light emitting structure according to another embodiment of the present invention;

[0019] Fig.10 is a cross-sectional schematic diagram of a light emitting structure according to yet another embodiment of the present invention;

[0020] Fig.11 is a cross-sectional schematic diagram of a light emitting structure according to another embodiment of the present invention;

[0021] Fig.12 FIG. 4 is a cross-sectional schematic diagram of a light emitting structure according to another embodiment of the present invention. DETAILED DESCRIPTION

[0022] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0023] Figure 1 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure according to an embodiment of the present invention. Figure 1 The light emitting structure 100 of this embodiment includes a substrate 110 and at least one light emitting chip 120 ( Figure 1 110), a reflective layer 130, a packaging glue 140, a reflective polarizer 150, and a polarization conversion element 160. The light emitting chip 120 is disposed on the substrate 110, and the reflective layer 130 is disposed on the substrate 110. The packaging glue 140 encapsulates the light emitting chip 120 and covers the reflective layer 130. In the present embodiment, the light emitting chip 120 is, for example, a light emitting diode chip, such as a white light emitting diode chip, a blue light emitting diode chip, a red light emitting diode chip, a green light emitting diode chip, or a light emitting diode of other emitting colors.

[0024] The reflective polarizer 150 is disposed on the encapsulant 140 , and the polarization conversion element 160 is disposed on or in the encapsulant 140 . In the present embodiment, the polarization conversion element 160 is disposed on the encapsulant 140 , and the polarization conversion element 160 is, for example, a light diffusion layer disposed between the encapsulant 140 and the reflective polarizer 150 .

[0025] The reflective polarizer 150 is used to allow the light P1 with the first polarization direction in the light 122 emitted by the light emitting chip 120 to pass through, and to reflect the light P2 with the second polarization direction in the light 122, and the polarization conversion element 160 is used to change the polarization direction of the light P2 reflected by the reflective polarizer 150. Specifically, although the light P2 reflected by the reflective polarizer 150 has the second polarization direction, the linear polarization characteristics of the second polarization direction will be destroyed by the diffusion effect of the light diffusion layer (i.e., the polarization conversion element 160), and converted into light 123 without polarization direction. In this way, the light with the first polarization direction in the light 123 diffused by the light diffusion layer can pass through the reflective polarizer 150, for example, it is reflected by the reflective layer 130 and then passes through the reflective polarizer 150. In this way, the proportion of the combined light 124 (including the light P1 with the first polarization direction in the light 122 and the light with the first polarization direction in the light 123) passing through the reflective polarizer 150 can be effectively increased, thereby effectively improving the light efficiency of the light emitting structure 100. In addition, in the light emitting structure 100 of the present embodiment, the reflective polarizer 150 is disposed on the packaging glue 140, so that the light emitting structure 100 can be thinner and lighter. In one embodiment, the first polarization direction is, for example, the P polarization direction, and the second polarization direction is, for example, the S polarization direction, but the present invention is not limited thereto.

[0026] In this embodiment, the light emitting structure 100 further includes a reflective frame 170 surrounding the light emitting chip 120 and surrounding the side of the packaging glue 140. The reflective frame 170 can reflect the lateral light 122 emitted by the light emitting chip 120 to improve the light efficiency of the light emitting structure 100.

[0027] In this embodiment, the substrate 110 may be a printed circuit board (PCB), a resin substrate, a thin metal substrate or a flexible printed circuit board. The reflective polarizer 150 may be composed of a multilayer film stretched and stacked optical material, or a wire-grid polarizer with a periodic microstructure. The reflective layer 130 may be a reflective sheet attached to the substrate 110, or a reflective coating coated on the substrate 110. The reflective frame 170 may be a resin frame glue with high reflective material particles added or a plastic frame made by injection molding.

[0028] Figure 2 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Figure 2 The light emitting structure 100a of this embodiment is Figure 1The light emitting structure 100a of the present embodiment is similar to the light emitting structure 100, and the main differences between the two are as follows. In the light emitting structure 100a of the present embodiment, the polarization conversion element 160a is a light scattering particle doped in the packaging glue 140, and the light scattering particle can diffuse and scatter the light 122, and can destroy the linear polarization property of the second polarization direction of the light P2 reflected by the reflective polarizer 150, and convert it into a non-polarized direction.

[0029] Figure 3A is a top view schematically showing a light emitting structure according to another embodiment of the present invention, and Figure 3B for Figure 3A Please refer to Figure 3A and Figure 3B The light emitting structure 100b of this embodiment is Figure 2 In the light emitting structure 100b of the present embodiment, the packaging glue 140 encapsulates the plurality of light emitting chips 120, and the transmission axis direction D1 of the reflective polarizer 150 is the polarization direction of the combined light 124 having the first polarization direction.

[0030] Figure 4 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Figure 4 The light emitting structure 100c of this embodiment is Figure 3B The light emitting structure 100c of the present embodiment is similar to the light emitting structure 100b, and the main differences between the two are as follows. The light emitting structure 100c of the present embodiment also includes a wavelength conversion layer 180, which is disposed between the encapsulant 140 and the reflective polarizer 150, and is used to change the wavelength of the light 122, wherein the wavelength conversion layer 180 may be a phosphor layer or a quantum dot layer. For example, in the present embodiment, the light emitting chip 120 may be a blue light emitting diode, and the wavelength conversion layer 180 may be a yellow phosphor layer to convert the blue light emitted by the blue light emitting diode into yellow light, and the unconverted blue light and yellow light can be mixed into white light, but the present invention is not limited to this. In other embodiments, the light emitting chip 120 may also emit light 122 of other wavelength bands, such as light of other visible light bands or ultraviolet light, and the wavelength conversion layer 180 may also be a phosphor layer or a quantum dot layer of other colors, such as a phosphor layer or a quantum dot layer of red, green, blue or a combination thereof.

[0031] Figure 5 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Figure 5 The light emitting structure 100d of this embodiment is Figure 4The light emitting structure 100d of the present embodiment is similar to the light emitting structure 100c, and the main differences between the two are as follows. The light emitting structure 100d of the present embodiment further includes a wave plate 190, wherein the reflective polarizer 150 is disposed between the packaging glue 140 and the wave plate 190. In one embodiment, the wave plate 190 is, for example, a quarter wave plate, which can convert the first polarization direction (i.e., linear polarization) of the light 122 into a circular polarization direction or an elliptical polarization direction, thereby becoming light P1 having a circular polarization direction or an elliptical polarization direction.

[0032] Figure 6 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Figure 6 The light emitting structure 100e of this embodiment is Figure 3B The light emitting structure 100e of the embodiment is similar to the light emitting structure 100b, and the main differences between the two are as follows. In the light emitting structure 100e of the present embodiment, the polarization conversion element 160b is a wave plate, which is disposed between the reflective layer 130 and the packaging glue 140. In one embodiment, the polarization conversion element 160b is, for example, a quarter wave plate, and the light P2 in the light 122 that is reflected by the reflective polarizer 150 and has the second polarization direction D2 will sequentially pass through the quarter wave plate, be reflected by the reflective layer 130, and pass through the quarter wave plate again. Since the light P2 in the light 122 passes through the quarter wave plate twice, its polarization direction will be converted from the second polarization direction D2 to the first polarization direction D1, so that the light P2 in the light 122 can be converted into the light P1 with the first polarization direction D1 after passing through the quarter wave plate twice and continue to pass through the reflective polarizer 150 to become effective light.

[0033] Figure 7 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Figure 7 The light emitting structure 100f of this embodiment is Figure 6 The light emitting structure 100e of the embodiment is similar to the light emitting structure 100f of the embodiment, and the main difference between the two is that the light emitting structure 100f of the embodiment further includes a wave plate 190, wherein the reflective polarizer 150 is disposed between the packaging glue 140 and the wave plate 190. In one embodiment, the wave plate 190 is, for example, a quarter wave plate, which can transform the first polarization direction (i.e., linear polarization) of the light 122 into a circular polarization direction.

[0034] Fig. 8A is a top view schematically showing a light emitting structure according to another embodiment of the present invention, and Figure 8B for Fig. 8A Schematic side view of the light emitting structure. Fig. 8A and Figure 8B The light emitting structure 100g of this embodiment is Figure 3A and Figure 3BThe light emitting structure 100g of the present embodiment is similar to the light emitting structure 100b, and the main difference between the two is that the light emitting structure 100g of the present embodiment further includes a motor base 210, wherein the substrate 110 is disposed on the motor base 210, and the motor base 210 is used to rotate the substrate 110, thereby rotating the reflective polarizer 150. Specifically, the motor base 210 can rotate about the optical axis of the reflective polarizer 150, thereby rotating the first polarization direction D1. In this way, the light emitting structure 100g can be applied to more occasions and provide light 122 with a suitable polarization direction.

[0035] Fig. 9 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Fig. 9 The light emitting structure 100h of the present embodiment includes a light guide plate 220, at least one light emitting element 240, a light-transmitting layer 250, a reflective polarizer 150 and a first reflective layer 260. The light guide plate 220 has a first surface 222, a second surface 224 opposite to the first surface 222 and at least one light incident surface 226 connecting the first surface 222 and the second surface 224, wherein the second surface 224 is provided with a light scattering microstructure layer 230. At least one light emitting element 240 is disposed on the at least one light incident surface 226 and emits light toward the at least one light incident surface 226. The light-transmitting layer 250 is disposed on the first surface 222, wherein the refractive index of the light-transmitting layer 250 is lower than the refractive index of the light guide plate 220. The light-transmitting layer 250 is disposed between the light guide plate 220 and the reflective polarizer 150. The first reflective layer 260 is disposed on the second surface 224.

[0036] In this embodiment, the light 122 emitted by the light emitting element 240 enters the light guide plate 220 through the light incident surface 226. Since the refractive index of the light-transmitting layer 250 is lower than the refractive index of the light guide plate 220, when the light 122 enters the first surface 222 at an incident angle greater than the critical angle, it will be totally reflected by the first surface 222 and confined in the light guide plate 220. Similarly, when the light 122 enters the second surface 224 at an incident angle greater than the critical angle, it will also be totally reflected by the second surface 224 and confined in the light guide plate 220. In this way, the light 122 can be transmitted in the light guide plate 220 to the side surface 228 of the light guide plate 220 opposite to the light incident surface 226. However, when the light 122 enters the second surface 224 and irradiates the microstructure of the light scattering microstructure layer 230 on the second surface 224, the microstructure will destroy the total reflection, so that the light 122 is scattered. In this way, a portion of the light 122 can be scattered upwards and pass through the light-transmitting layer 250 to be transmitted to the reflective polarizer 150, while another portion of the light 122 is scattered downwards and then reflected upwards by the first reflective layer 260, and sequentially passes through the light guide plate 220 and the light-transmitting layer 250 to be transmitted to the reflective polarizer 150. The reflective polarizer 150 has the same effect on the scattered light that is scattered by the light-scattering microstructure layer 230 and reaches the reflective polarizer 150. Figure 1 As described in the embodiment of the present invention, it is used to allow the light P1 having the first polarization direction D1 in the scattered light to pass through, and to reflect the light P2 having the second polarization direction D2 in the scattered light. The light P2 reflected by the reflective polarizer 150 can be scattered by the light scattering microstructure layer 230 to change the polarization direction and become light without polarization direction, and the light P1 having the first polarization direction D1 can pass through the reflective polarizer 150, thereby increasing the proportion of the combined light 124 of the light 122 that finally passes through the reflective polarizer 150. Therefore, the light emitting structure 100h of this embodiment can have a higher light efficiency.

[0037] In addition, in the light emitting structure 100h of the present embodiment, a reflective polarizer 150 is disposed above the first surface 222 of the light guide plate 220, so the light emitting structure 100h can be thinner and lighter.

[0038] In this embodiment, the light emitting structure 100h further includes a second reflective layer 270, wherein the light guide plate 220 has a side surface 228, which is opposite to the light incident surface 226 and connects the first surface 222 and the second surface 224, and the second reflective layer 270 is disposed on the side surface 228 to reflect the light 122 transmitted laterally in the light guide plate 220, so that the light 122 can be recycled and reused, thereby improving the light efficiency of the light emitting structure 100h. In one embodiment, the other two side surfaces adjacent to the light incident surface 226 and connecting the light incident surface 226 and the side surface 228 may also be provided with a reflective layer to further improve the recovery rate of the light 122, or in another embodiment, the other two side surfaces may not be provided with a reflective layer.

[0039] In this embodiment, the material of the light guide plate 220 may be plastic or glass, such as polymethyl methacrylate or optical glass. The first reflective layer 260 and the second reflective layer 270 may be reflective sheets or reflective coatings. In this embodiment, the light emitting element 240 may include Figure 1 The light emitting chip 120 can be electrically connected to the flexible printed circuit board and the driving circuit 242. In addition, the light emitting element 240 can be a light emitting diode that can emit white light, or can include light emitting diodes of multiple different light emitting colors (such as blue light, green light and red light emitting diodes), or can be a light emitting diode that emits light of a single color (such as any one of a blue light emitting diode, a green light emitting diode and a red light emitting diode).

[0040] Fig.10 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Fig.10 The light emitting structure 100i of this embodiment is Fig. 9The light emitting structure 100i of the embodiment is similar to the light emitting structure 100h, and the main difference between the two is that the light emitting structure 100i of the present embodiment further includes a wavelength conversion layer 180, which is disposed between the light-transmitting layer 250 and the reflective polarizer 150. The wavelength conversion layer 180 may be a phosphor layer or a quantum dot layer. For example, in the present embodiment, the light emitting element 240 may be a blue light emitting diode, and the wavelength conversion layer 180 may be a yellow phosphor layer to convert the blue light emitted by the blue light emitting diode into yellow light, and the unconverted blue light and yellow light can be mixed into white light, but the present invention is not limited to this. In other embodiments, the light emitting element 240 may also emit light 122 of other wavelengths, such as light of other visible light wavelengths or ultraviolet light, and the wavelength conversion layer 180 may also be a phosphor layer or a quantum dot layer of other colors, such as a phosphor layer or a quantum dot layer of red, green, blue or a combination thereof.

[0041] Fig.11 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Fig.11 The light emitting structure 100j of this embodiment is Fig.10 The light emitting structure 100i of the embodiment is similar to the light emitting structure 100j of the embodiment, and the main difference between the two is that the light emitting structure 100j of the embodiment further includes a wave plate 190, wherein the reflective polarizer 150 is disposed between the light-transmitting layer 250 and the wave plate 190. In one embodiment, the wave plate 190 is, for example, a quarter wave plate, which can convert the first polarization direction (i.e., linear polarization) of the light 122 into a circular polarization direction or an elliptical polarization direction.

[0042] Fig.12 FIG. 1 is a cross-sectional schematic diagram of a light emitting structure of another embodiment of the present invention. Fig.12 The light emitting structure 100k of this embodiment is Fig.10 The light emitting structure of 100i is similar, and the main difference between the two is Fig.10 The light guide plate 220 of the light emitting structure 100i of the present embodiment has only one light incident surface 226, while the light guide plate 220 of the light emitting structure 100k of the present embodiment has two opposite light incident surfaces 226, and two light emitting elements 240 are respectively arranged beside the two opposite light incident surfaces 226. In this way, the light quantity of the light P1 provided by the light emitting structure 100k can be increased. In other embodiments, three or four side surfaces of the light guide plate 220 can also be light incident surfaces 226, and a light emitting element 240 is arranged beside each light incident surface 226.

[0043] In summary, in the light-emitting structure of the embodiment of the present invention, a reflective polarizer is used to allow the light with the first polarization direction in the light emitted by the light-emitting chip to pass through, and the light with the second polarization direction in the light is reflected, and a polarization conversion element is used to change the polarization direction of the light reflected by the reflective polarizer, so that more light has the first polarization direction and can pass through the reflective polarizer. Therefore, the light-emitting structure of the embodiment of the present invention can have a higher light efficiency. In addition, in the light-emitting structure of the embodiment of the present invention, the reflective polarizer is configured on the packaging glue, so the light-emitting structure can be thinned and have a lighter weight. In the light-emitting structure of the embodiment of the present invention, the light-transmitting layer is configured on the first surface of the light guide plate, the light-transmitting layer is configured between the light guide plate and the reflective polarizer, and the second surface of the light guide plate is provided with a light scattering microstructure layer, so the light reflected by the reflective polarizer can change the polarization direction by being scattered by the light scattering microstructure layer, thereby increasing the proportion of light passing through the reflective polarizer. Therefore, the light-emitting structure of the embodiment of the present invention can have a higher light efficiency. In addition, in the light emitting structure of the embodiment of the present invention, a reflective polarizer is configured above the first surface of the light guide plate, so the light emitting structure can be thinner and lighter.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light emitting structure, characterized in that: include: substrate; At least one light-emitting chip is disposed on the substrate; A reflective layer, disposed on the substrate; Packaging glue, encapsulating the light-emitting chip and covering the reflective layer; A reflective polarizer, disposed on the packaging adhesive; as well as A polarization conversion element is disposed on or within the packaging glue, wherein the reflective polarizer is used to allow light with a first polarization direction in the light emitted by the light-emitting chip to pass through, and is used to reflect light with a second polarization direction in the light, and the polarization conversion element is used to change the polarization direction of the light reflected by the reflective polarizer.

2. The light emitting structure according to claim 1, characterized in that: The polarization conversion element is a light diffusion layer, which is disposed between the packaging glue and the reflective polarizer.

3. The light emitting structure according to claim 1, characterized in that: The polarization conversion element is light scattering particles doped in the packaging glue.

4. The light emitting structure according to claim 1, characterized in that: It also includes a reflective frame surrounding the light-emitting chip and surrounding the side of the packaging glue.

5. The light emitting structure according to claim 1, characterized in that: The invention also comprises a wavelength conversion layer, which is arranged between the packaging glue and the reflective polarizer and is used for changing the wavelength of the light.

6. The light emitting structure according to claim 1, characterized in that: A wave plate is also included, wherein the reflective polarizer is configured between the packaging glue and the wave plate.

7. The light emitting structure according to claim 1, characterized in that: The polarization conversion element is a wave plate, and is disposed between the reflective layer and the packaging glue.

8. The light emitting structure according to claim 7, characterized in that: The wave plate is a quarter wave plate.

9. The light emitting structure according to claim 1, characterized in that: It comprises a motor base, wherein the substrate is arranged on the motor base, and the motor base is used to rotate the substrate, thereby rotating the reflective polarizer.

10. A light emitting structure, characterized in that: include: A light guide plate having a first surface, a second surface opposite to the first surface, and at least one light incident surface connecting the first surface and the second surface, wherein the second surface is provided with a light scattering microstructure layer; At least one light-emitting element is disposed beside the at least one light-incident surface and emits light toward the at least one light-incident surface; A light-transmitting layer, disposed on the first surface, wherein the refractive index of the light-transmitting layer is lower than the refractive index of the light guide plate; A reflective polarizer, wherein the light-transmitting layer is disposed between the light guide plate and the reflective polarizer; and The first reflective layer is disposed on the second surface.

11. The light emitting structure according to claim 10, characterized in that: It also includes a second reflective layer, wherein the light guide plate has a side surface, opposite to the light incident surface and connecting the first surface and the second surface, and the second reflective layer is configured on the side surface.

12. The light emitting structure according to claim 10, characterized in that: The invention also comprises a wavelength conversion layer, which is arranged between the light-transmitting layer and the reflective polarizer.

13. The light emitting structure according to claim 10, characterized in that: A wave plate is also included, wherein the reflective polarizer is disposed between the light-transmitting layer and the wave plate.

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