Double-sided light guide plate structure and backlight source

Abstract

The invention relates to a double-face light guide plate structure which comprises a light guide plate body, the light guide plate body comprises a main light emitting part, an auxiliary light emitting part and a light guide part obliquely connected with the main light emitting part and the auxiliary light emitting part, and the main light emitting part is configured to guide light to be emitted in the first direction; the light guide part is configured to guide part of light emitted by the light source to be emitted from a second direction, the second direction is opposite to the first direction, and a plurality of main light emitting parts are arranged around each auxiliary light emitting part. The double-sided light guide plate structure can fully utilize the light rays emitted by the light-emitting chip at all angles, in addition, due to the fact that the large-angle light rays emitted by the light source are guided through the light guide part to be emitted at the auxiliary light emitting part, the light source does not need to be additionally arranged at the position of the second light guide part, the practicability of the light-emitting chip can be reduced, and the cost is reduced. Therefore, heating of the backlight source can be reduced.

Description

Technical Field

[0001] The present application relates to the field of display lighting technology, and in particular to a double-sided light guide plate structure and a backlight source. Background Art

[0002] Double-sided light guide plates are used in many products due to their double-sided light guiding properties. For example, in the field of lighting, display devices, advertising signs, etc. Existing double-sided light guide plates use side-entry light input, which is combined with a lens structure to extract light from the light output surface. However, the side-entry light input structure requires a lens that can adjust the light output angle to be embedded in the center of the light guide plate so that the light is split and emitted to two opposite sides. This will cause a dark area in the center of the light guide plate, which cannot be used in some occasions that require high quality of the backlight source.

[0003] Therefore, it is necessary to provide a double-sided light guide plate structure that can solve the above problems. Summary of the invention

[0004] The present application provides a double-sided light guide plate structure to solve the technical problem of dark areas in the current double-sided light guide plate structure.

[0005] A double-sided light guide plate structure, comprising: A light guide plate body, the light guide plate body includes a main light emitting portion, a secondary light emitting portion and a light guide portion obliquely connected to the main light emitting portion and the secondary light emitting portion, the main light emitting portion is configured to guide light to be emitted from a first direction, the light guide portion is configured to guide light emitted by part of the light source to be emitted from a second direction, the second direction is opposite to the first direction, and a plurality of main light emitting portions are arranged around each secondary light emitting portion.

[0006] In one embodiment, the main light emitting portion includes a first surface and a second surface opposite to each other, and the light guide plate body is provided with a groove for arranging the light emitting chip, and the groove is provided at the position of the first light guide portion of the first surface.

[0007] In one of the embodiments, a transition portion is further provided between the main light emitting portion and the light guiding portion, and the transition portion can adjust the amount or transmission direction of light transmitted from the main light emitting portion to the auxiliary light emitting portion.

[0008] In one embodiment, the transition portion includes a light-transmitting box body, a medium sealed in the light-transmitting box body, and thermosensitive composite particles dispersed in the medium. The thermosensitive composite particles will be deposited in the light-transmitting box body or suspended in the medium to scatter light as the temperature changes.

[0009] In one embodiment, each main light emitting portion is connected to four light guiding portions, and the orthographic projection area of ​​the main light emitting portion is the same as the orthographic projection area of ​​the auxiliary light emitting portion.

[0010] In one embodiment, the light guiding portion can guide the light to be totally reflected therein.

[0011] In one embodiment, the auxiliary light emitting portion includes a first light adjustment surface and a first light emitting surface opposite to the first light adjustment surface, the first light adjustment surface is located on one side of the first surface, and the first light adjustment surface is configured to cause total reflection of light incident on its surface.

[0012] In one embodiment, the first light adjustment surface includes a first connecting arc surface and a second connecting arc surface surrounding the first connecting arc surface, the first connecting arc surface is convex in a direction away from the first light emitting surface, and the second connecting surface is trumpet-shaped.

[0013] In one embodiment, the first light adjustment surface includes a first connecting arc surface and a second connecting arc surface, the first connecting arc surface and the second connecting arc surface are centrally symmetrically arranged about the groove, and a sharp-angled light splitting portion is formed at the connection between the first connecting arc surface and the second connecting arc surface.

[0014] In one embodiment, the orthographic projection area of ​​the main light emitting portion is the same as the orthographic projection area of ​​the auxiliary light emitting portion.

[0015] In one embodiment, the second light emitting surface of the main light emitting portion and / or the first light emitting surface of the auxiliary light emitting portion are respectively provided with a light scattering particle layer.

[0016] The present application also relates to a backlight source.

[0017] A backlight source comprises: a light source and a double-sided light guide structure as described above, wherein the light source is arranged corresponding to a main light emitting portion or to a secondary light emitting portion or to both the main light emitting portion and the secondary light emitting portion.

[0018] The double-sided light guide plate structure provided in this application can achieve the following technical effects: 1. By making the light guide plate body include a main light emitting portion, a secondary light emitting portion and a light guide portion obliquely connected to the main light emitting portion and the secondary light emitting portion, the main light emitting portion guides the light to be emitted from a first direction, and the light guide portion guides the light emitted by part of the light source to be emitted from a second direction, the second direction is opposite to the first direction, and a plurality of main light emitting portions are arranged around each secondary light emitting portion. The structure of the present application can make the light emitting chip be arranged corresponding to the main light emitting portion or corresponding to the position of the secondary light emitting portion, so that the small-angle light emitted by the light emitting chip can be emitted from the main light emitting portion or the secondary light emitting portion arranged opposite thereto, and the large-angle light can be emitted from the secondary light emitting portion or the main light emitting portion after being guided by the light guide portion, so that the light of each angle emitted by the light emitting chip can be fully utilized, and since the large-angle light emitted by the light source is guided by the light guide portion to form light emission at the secondary light emitting portion, there is no need to arrange an additional light source at the position of the second light guide portion, which can reduce the practical use of the light emitting chip, thereby reducing the heat generation of the backlight source, and the above structure will not cause a dark area of ​​the light guide plate.

[0019] 2. By controlling the shape of the first light adjustment surface included in the auxiliary light emitting portion, the forward light can be spread to both sides, thereby improving the light emitting uniformity of the double-sided light guide plate structure.

[0020] 3. The double-sided light guide plate structure provided in the present application, the main light emitting part includes a second light emitting surface, and the second light emitting surface and / or the first light emitting surface are respectively provided with a light scattering particle layer, which can adjust the output angle of the light through the scattering particles, and can further achieve the effect of uniform light.

[0021] 3. The double-sided light guide plate structure provided in the present application has a transition portion between the main light emitting portion and the light guiding portion, and the transition portion can adjust the amount of light or the transmission direction transmitted from the main light emitting portion to the auxiliary light emitting portion; the thermosensitive composite particles will change their state as the temperature changes, thereby enabling the auxiliary light emitting portion to present two light emitting effects, that is, a smaller strong light spot or a larger uniform light spot will be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional schematic diagram of a double-sided light guide plate structure provided in the first embodiment of the present application; Figure 2 is a cross-sectional schematic diagram of a double-sided light guide plate structure provided in the second embodiment of the present application; Figure 3 is a cross-sectional schematic diagram of a double-sided light guide plate structure provided in the third embodiment of the present application; Figure 4 is a cross-sectional schematic diagram of a double-sided light guide plate structure provided in the fourth embodiment of the present application; Figure 5 yes Figure 4 A schematic diagram of the working state of a double-sided light guide plate structure is provided.

[0023] Explanation of the reference numerals: 100, double-sided light guide plate structure; 1, light guide plate body; 10, main light emitting part; 12, auxiliary light emitting part; 14, light guide part; 101, first surface; 102, second surface; 103, groove; 120, first light adjustment surface; 122, first light emitting surface; 130, first connecting arc surface; 132, second connecting arc surface; 134, light splitting part; 110, second light emitting surface; 2, light source; 16, light scattering particle layer; 20, transparent circuit board; 22, light emitting chip; 16, transition part; 161, light-transmitting box body; 163, thermosensitive composite particles. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-5 The double-sided light guide plate structure and backlight source provided in this application are further described in detail.

[0025] Example 1 See also Figure 1 The present application relates to a backlight source, which includes: a light source 2 and a double-sided light guide plate structure 100, wherein the light source 2 includes a transparent circuit board 20 and an array of light-emitting chips 22 arranged on the surface of the transparent circuit board 20.

[0026] The double-sided light guide plate structure 100 includes a light guide plate body 1. The light guide plate body 1 includes a main light emitting portion 10, a secondary light emitting portion 12 arranged in an array, and a light guide portion 14 obliquely connected to the main light emitting portion 10 and the secondary light emitting portion 12. The main light emitting portion 10 is configured to guide light to be emitted from a first direction, and the light guide portion 14 is configured to guide light emitted from a part of the light emitting chip 22 to be emitted from a second direction, which is opposite to the first direction. A plurality of main light emitting portions 10 are arranged around each secondary light emitting portion 12.

[0027] In this embodiment, each main light emitting portion 10 is connected to four light guiding portions 14, and the orthographic projection area of ​​the main light emitting portion 10 is the same as the orthographic projection area of ​​the auxiliary light emitting portion 12, so as to ensure the uniformity of light emission from two opposite surfaces.

[0028] In a preferred embodiment, a reflective layer (not shown) is formed on the peripheral surface of the main light emitting portion 10 exposed by the light guiding portion 14, so that all light reaching the side wall of the main light emitting portion 10 can be reflected and emitted.

[0029] The light-guiding portion 14 can guide the light to be totally reflected therein. In a feasible embodiment, the light-guiding portion 14 is formed of two material layers with different refractive indices, so that the light incident therein can be confined to be transmitted inside it.

[0030] The light guide plate body 1 includes a first surface 101 and a second surface 102 opposite to each other. In the present embodiment, a groove 103 for arranging the light emitting chip is opened at the position of the main light emitting portion 10 of the first surface 101 .

[0031] In this embodiment, the auxiliary light emitting portion 12 includes a first light adjustment surface 120 and a first light emitting surface 122 opposite to the first light adjustment surface 120. The first light adjustment surface 120 and the first light emitting surface 122 are respectively connected to two opposite surfaces of the light guide portion 14. The first light adjustment surface 120 is concavely arranged in a direction close to the first light emitting surface 122. The first light adjustment surface 120 is a reflective surface to reflect the light of the light guide portion 14 to be emitted from the first light emitting surface 122. The first light adjustment surface 120 can be provided with a reflective layer so that all light incident on its surface can be reflected.

[0032] In this embodiment, the second light emitting surface 110 of the main light emitting portion 10 and / or the first light emitting surface 122 of the auxiliary light emitting portion 12 are respectively provided with a light scattering particle layer 16 .

[0033] The working principle of the double-sided light guide plate structure 100 provided in the present application is as follows: the light emitting chip 22 is arranged in the groove 103 of the main light emitting part 10, and there may be multiple light emitting chips 22 corresponding to each groove 103. The forward light L0 emitted from the light source 2 is directly emitted from the second light emitting surface 110 included in the main light emitting part 10, and the second light emitting surface 110 is provided with a light scattering particle layer 16, which diffuses the light emitted from the second light emitting surface 110 to both sides so that the light covers the area between two adjacent main light emitting parts 10; the large-angle light L1 and L2 emitted from the light source 2 are guided by the light guide part 14, totally reflected in the light guide part 14, and reach the first light adjustment surface 120, and the first light adjustment surface 120 reflects the light, thereby transmitting the light from the first light adjustment surface 120 to the first light adjustment surface 120. The light is emitted from the first light emitting surface 122, and the light with a large angle is guided by the light guiding portion 14 and then emitted from the auxiliary light emitting portion 12 or the main light emitting portion 10. The first light emitting surface 122 is provided with a light scattering particle layer 16, which diffuses the light emitted from the first light emitting surface 122 from the middle to both sides, so that the light covers the area between the two adjacent second light emitting surfaces 110. Therefore, the double-sided light guide plate structure 100 provided in the present application can make full use of the light at various angles emitted by the light emitting chip 22 through the cooperation of the main light emitting portion 10 and the auxiliary light emitting portion 12.

[0034] Example 2 See also Figure 2 This embodiment is basically the same as the first embodiment, except that, in this embodiment, the light source 2 is attached to the first surface 101 of the main light emitting portion 10. The first light adjustment surface 120 includes a first connecting arc surface 130 and a second connecting arc surface 132 surrounding the first connecting arc surface 130. The first connecting arc surface 130 is convex in a direction away from the first light emitting surface 122, and the second connecting arc surface 132 is horn-shaped.

[0035] The working principle of the double-sided light guide plate structure 100 provided in the present application is: the light source 2 is arranged in the groove 103 corresponding to the main light emitting part 10, and the forward light emitted from the light source 2 is directly emitted from the second light emitting surface 110 included in the main light emitting part 10. The second light emitting surface 110 is provided with a light scattering particle layer 16, which diffuses the light emitted from the second light emitting surface 110 to both sides so that the light covers the area between two adjacent main light emitting parts 10; the large-angle light emitted from the light source 2 is guided by the light guide part 14, and the light is totally reflected in the light guide part 14 to reach the first light adjustment surface 120. Since the first adjustment surface includes a first connecting arc surface 130 and a second connecting arc surface 132, the large-angle light emitted from the light emitting chip 22 is adjusted in angle by the second connecting arc surface 132 and emitted from the middle area of ​​the first emitting surface. The large-angle light emitted from the light source 2 is adjusted in angle by the first connecting arc surface 130 and then emitted from the edge area of ​​the first light emitting surface 122, thereby enabling the first light emitting surface 122 to be covered by light of various angles.

[0036] Example 3 See also Figure 3 This embodiment is basically the same as the first embodiment, except that, in this embodiment, the light source 2 is arranged close to the main light emitting portion 10 of the first surface 101, and the first light adjustment surface 120 includes a first connecting arc surface 130 and a second connecting arc surface 132. The first connecting arc surface 130 and the second connecting arc surface 132 are centrally symmetrically arranged about the groove 103, and a sharp-angled light splitting portion 134 is formed at the connection between the first connecting arc surface 130 and the second connecting arc surface 132.

[0037] The working principle of the double-sided light guide plate structure 100 provided in the present application is as follows: the forward light emitted from the light source 2 is directly emitted from the second light emitting surface 110 included in the main light emitting portion 10, and the second light emitting surface 110 is provided with a light scattering particle layer 16, which diffuses the light emitted from the second light emitting surface 110 to both sides so that the light covers the area between two adjacent main light emitting portions 10; the large-angle light emitted from the light source 2 is guided by the light guide portion 14, and the light is totally reflected in the light guide portion 14 to reach the first light adjustment surface 120. Since the first light adjustment surface 120 includes a first connecting arc surface 130 and The second connecting arc surface 132, the first connecting arc surface 130 and the second connecting arc surface 132 are centrally symmetrically arranged about the groove 103, and a sharp-angled splitter portion 134 is formed at the connection between the first connecting arc surface 130 and the second connecting arc surface 132, so that light with a large angle is totally reflected in the light guide portion 14 and incident on the first connecting arc surface 130, and the center of the first connecting arc surface 130 is located on the inner side of the light guide plate body 1. This structural design ensures that light incident on the first connecting arc surface 130 or the second connecting arc surface 132 can be totally reflected and finally emitted from the first light emitting surface 122.

[0038] The spectrometer 134 can effectively split the light incident from the light source into multiple directions, optimizing the light transmission path. After the light enters, according to the angle change of the spectrometer 134, the light can be distributed to different areas of the light guide plate, thereby enhancing the uniformity of the light. The design of the spectrometer 134 ensures that the light propagates along a predetermined path, effectively avoiding the concentration or uneven distribution of light, and increasing the brightness and uniformity of the display. Through the structural design of the sharp-angle spectrometer 134, the light can be more efficiently propagated and reflected inside the light guide plate, reducing light loss and improving the overall light utilization efficiency.

[0039] Example 4 See also Figure 4 The structure of the fourth embodiment is basically the same as that of the third embodiment, except that, in this embodiment, a transition portion 10 is further provided between the main light emitting portion 10 and the light guiding portion 14. The transition portion 10 can adjust the amount or transmission direction of light transmitted from the main light emitting portion 10 to the auxiliary light emitting portion 12.

[0040] Specifically, the transition part 16 includes a light-transmitting box body 161, a medium (not shown) sealed in the light-transmitting box body 161, and thermosensitive composite particles 163 dispersed in the medium. The medium can be an aqueous solution, the thermosensitive composite particles 163 are temperature-responsive particles, and the thermosensitive composite particles 163 are PNIPAM-metal nanoparticle composite particles. The metal nanoparticles are located in the core, and PNIPAM is a light-transmitting thermosensitive polymer that wraps the metal nanoparticles. The metal nanoparticles can be gold or a rate material.

[0041] When the temperature is below its LCST (lower critical solution temperature), PNIPAM behaves hydrophilically, disperses in water, and the particles are suspended; when the temperature rises to above its LCST, PNIPAM undergoes a phase transition and behaves hydrophobic, causing the polymer particles to aggregate and settle.

[0042] The thermosensitive composite particles 163 change their state as the temperature changes, so that the auxiliary light-emitting portion 12 can present two light-emitting effects. When the thermosensitive composite particles 163 absorb heat, they are deposited in the box body, and the box body is a parallelogram, so they are deposited at the corners of the light-transmitting box body 161 ( Figure 4 The enlarged view of the circular area) will not affect the penetration of the light emitted from the main light emitting portion 10, and the light spot of the auxiliary light emitting portion 12 is basically the same as that of the third embodiment, that is, the light spot is smaller and the brightness is stronger; when the temperature is lower than the lower critical solution temperature (LCST) of PNIPAM, the thermosensitive composite particles 163 are hydrophilic, and the thermosensitive composite particles 163 are dispersed in the liquid to achieve scattering of light and thus achieve uniform light ( Figure 5The enlarged view of the circular area) can adjust the angle at which the light reaches the first connecting arc surface 130 and the second connecting arc surface 132, so that the light can be incident on the first connecting arc surface 130 and the second connecting arc surface 132 at various angles, and reflected at the first connecting arc surface 130 and the second connecting arc surface 132, so that the light spot formed when it is emitted from the auxiliary light-emitting portion 12 is relatively soft. The LCST temperature of the thermosensitive composite particles 163 is around 35 degrees. In other words, uniform light can be achieved when the temperature of the medium is controlled to be lower than 35 degrees, and a strong light spot can be achieved when the temperature is higher than 35 degrees. Therefore, the heating state of the double-sided light guide plate structure 100 can also be judged by the shape of the light spot.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-sided light guide plate structure, characterized in that: include: A light guide plate body (1), the light guide plate body (1) comprising a main light emitting portion (10), a secondary light emitting portion (12) arranged in an array, and a light guide portion (14) obliquely connected to the main light emitting portion (10) and the secondary light emitting portion (12), the main light emitting portion (10) being configured to guide light to be emitted from a first direction, the light guide portion (14) being configured to guide light emitted by a part of the light source to be emitted from a second direction, the second direction being opposite to the first direction, and a plurality of main light emitting portions (10) being arranged around each secondary light emitting portion (12).

2. The double-sided light guide plate structure according to claim 1, characterized in that: A transition portion (10) is also provided between the main light emitting portion (10) and the light guiding portion (14), and the transition portion (10) can adjust the amount or transmission direction of light transmitted from the main light emitting portion (10) to the auxiliary light emitting portion (12).

3. A double-sided light guide plate structure according to claim 2, characterized in that: The transition portion (16) comprises a light-transmitting box body (161), a medium sealed in the light-transmitting box body (161), and thermosensitive composite particles (163) dispersed in the medium. The thermosensitive composite particles (163) will be deposited in the light-transmitting box body (161) or suspended in the medium to scatter light as the temperature changes.

4. The double-sided light guide plate structure according to claim 2, characterized in that: Each main light emitting portion (10) is connected to four light guiding portions (14); the orthographic projection area of ​​the main light emitting portion (10) is the same as the orthographic projection area of ​​the auxiliary light emitting portion (12).

5. The double-sided light guide plate structure according to claim 4, characterized in that: The auxiliary light emitting portion (12) comprises a first light adjustment surface (120) and a first light emitting surface (122) opposite to the first light adjustment surface (120); the first light adjustment surface (120) is located on one side of the first surface (101); and the first light adjustment surface (120) is configured to cause total reflection of light incident on its surface.

6. The double-sided light guide plate structure according to claim 5, characterized in that: The first light adjustment surface (120) comprises a first connecting arc surface (130) and a second connecting arc surface (132) surrounding the first connecting arc surface (130); the first connecting arc surface (130) is convex in a direction away from the first light emitting surface (122); and the second connecting surface is horn-shaped.

7. The double-sided light guide plate structure according to claim 5, characterized in that: The first light adjustment surface (120) comprises a first connecting arc surface (130) and a second connecting arc surface (132); the first connecting arc surface (130) and the second connecting arc surface (132) are centrally symmetrically arranged with respect to the groove (103); and a light splitting portion (134) with a sharp angle is formed at the connection between the first connecting arc surface (130) and the second connecting arc surface (132).

8. The double-sided light guide plate structure according to claim 7, characterized in that: The main light emitting portion (10) comprises a first surface (101) and a second surface (102) which are opposite to each other. The light guide plate body (1) is provided with a groove (103) for arranging a light emitting chip. The groove (103) is provided at the position of the first light guide portion (14) of the first surface (101).

9. The double-sided light guide plate structure according to claim 7, characterized in that: The main light emitting portion (10) comprises a second light emitting surface (110), and the second light emitting surface (110) and / or the first light emitting surface (122) are respectively provided with a light scattering particle layer (16).

10. A backlight source, characterized in that: include: A light source (2) and a double-sided light guide structure as claimed in any one of claims 1 to 9, wherein the light source (2) is arranged corresponding to the main light emitting portion (10).

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