Light source module

Abstract

The invention provides a light source module. The light source module comprises a light guide plate, a light source, a plurality of micro grooves, a light-transmitting base material, a cover plate, an adhesion layer, an anti-adsorption adhesion layer and an adhesive layer, the light source is arranged on one side of the incident surface of the light guide plate. The plurality of micro grooves are arranged on the first surface of the light guide plate and located in the action area. The light-transmitting base material is arranged on the first surface. The cover plate is arranged on the side, back to the light guide plate, of the light-transmitting base material and connected with the light-transmitting base material through the adhesion layer. The anti-adsorption adhesion layer is arranged between the light-transmitting base material and the light guide plate and covers the active area of the first surface and the non-active area located on the periphery of the active area. The surface energy of the surface, facing the light guide plate, of the anti-adsorption adhesive layer is smaller than 300 mJ / m < 2 >. And the adhesive layer is arranged between the anti-adsorption adhesive layer and the light guide plate. The adhesive layer covers the non-active area of the first surface and does not cover the active area of the first surface.

Description

Technical Field

[0001] The present invention relates to a light source module, and in particular to a light source module suitable for being arranged on a reflective display panel. Background Art

[0002] In order to meet the needs of use in low ambient light, a display device equipped with a front light source has been proposed. The front light source includes a light guide plate arranged on one side of the display surface. In order to prevent the light guide plate from being damaged due to operation or unexpected external force, the front light source generally also provides a protective cover plate on the side of the light guide plate away from the display panel. However, during the process of attaching the cover plate to the light guide plate, the adhesive layer used for attachment is likely to flow into the surface microstructure of the light guide plate when it contacts the light guide plate, thereby affecting its light extraction efficiency. If a glue material with lower viscosity is selected as the adhesive layer, it is easy for the cover plate to separate from the light guide plate or the bonding condition to be poor after bonding. Summary of the Invention

[0003] The present invention is directed to a light source module, wherein the bonding relationship between the cover plate and the light guide plate is stable and does not affect the optical performance of the light guide plate.

[0004] According to an embodiment of the present invention, a light source module includes a light guide plate, a light source, a plurality of micro grooves, a light-transmitting substrate, a cover plate, an adhesive layer, an anti-adsorption and adhesion layer, and an adhesive layer. The light guide plate has a light incident surface and a first surface connected to each other. The first surface is provided with an active area and a non-active area located outside the active area. The light source is arranged on one side of the light incident surface of the light guide plate and is adjacent to the light incident surface. A plurality of micro grooves are arranged on the first surface of the light guide plate and are located within the active area. The light-transmitting substrate is arranged on the first surface. The cover plate is arranged on the side of the light-transmitting substrate facing away from the light guide plate. The adhesive layer connects the cover plate and the light-transmitting substrate. The light source module is suitable for being arranged on the display surface of a reflective display panel. The second surface of the light guide plate faces the display surface. The second surface is connected to the light incident surface and is opposite to the first surface. The anti-adsorption and adhesion layer is arranged between the light-transmitting substrate and the light guide plate, and covers the active area and the non-active area of ​​the first surface. The surface energy of the anti-adsorption and adhesion layer facing the surface of the light guide plate is less than 300 mJ / m 2 The adhesive layer is disposed between the anti-adsorption and adhesion layer and the light guide plate. The adhesive layer covers the non-active area of ​​the first surface and does not cover the active area of ​​the first surface.

[0005] In the light source module according to the embodiment of the present invention, the first surface of the light guide plate has a first roughness and a second roughness in the active area and the inactive area respectively, and the second roughness is greater than the first roughness.

[0006] In the light source module according to the embodiment of the present invention, micro gaps are defined between the first surface of the light guide plate in the inactive area and the surface of the anti-adsorption and adhesion layer, and the adhesive layer is filled in the micro gaps.

[0007] In a light source module according to an embodiment of the present invention, the light guide plate further comprises a first side surface adjacent to or opposite the light incident surface. The first side surface is connected to the first surface. The light-transmitting substrate comprises a substrate surface connected to the anti-adsorption layer and a second side surface connected to the substrate surface. The adhesive layer extends from the micro-slit to cover the first side surface of the light guide plate and the second side surface of the light-transmitting substrate.

[0008] In the light source module according to the embodiment of the present invention, a thickness of the micro slit along a normal direction of the first surface is less than or equal to 30 μm.

[0009] In the light source module according to the embodiment of the present invention, the material of the anti-adhesion layer includes methyl silicate, silane-siloxane, octyltrichlorosilane, tungsten disulfide, Teflon or antistatic coating.

[0010] In the light source module according to the embodiment of the present invention, the arithmetic mean roughness of the surface of the anti-adhesion layer is less than 0.1 μm.

[0011] In the light source module according to the embodiment of the present invention, the material of the anti-adhesion layer includes acrylate, urethane, thermoplastic elastomer or cycloolefin copolymer.

[0012] In the light source module according to the embodiment of the present invention, a plurality of microparticles are dispersed in the anti-adsorption and adhesion layer, and the particle size of each microparticle is less than or equal to 20 μm.

[0013] In a light source module according to an embodiment of the present invention, a plurality of protrusions are provided on the surface of the anti-adhesion layer. Each protrusion has a height relative to the surface along a normal direction of the surface and a width along any direction parallel to the surface. The height is greater than 0 μm and less than or equal to 10 μm, and the width is greater than 0 μm and less than or equal to 20 μm.

[0014] Based on the above, in a light source module of an embodiment of the present invention, an anti-adsorption and adhesion layer is provided between the light guide plate and the cover plate. Since the surface energy of the anti-adsorption and adhesion layer facing the light guide plate is less than 300 mJ / m 2 This prevents adsorption or adhesion between the transparent substrate and the light guide plate, which could cause image distortion or anomalies in the reflective display panel. Furthermore, the adhesive layer connecting the transparent substrate and the cover plate is also suitable for flattening microscopic unevenness between the cover plate and the light guide plate, preventing the formation of bubbles that could affect visual quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic top view of a light source module according to a first embodiment of the present invention;

[0016] Figure 2 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention;

[0017] Figure 3 yes Figure 2 An enlarged schematic diagram of a local area of ​​a light source module;

[0018] Figure 4 yes Figure 3 A schematic cross-sectional view of an anti-adsorption and adhesion layer according to another modified embodiment;

[0019] Figure 5 yes Figure 3 A schematic cross-sectional view of an anti-adsorption and adhesion layer according to another modified embodiment;

[0020] Figure 6 is a schematic top view of a light source module according to a second embodiment of the present invention;

[0021] Figure 7 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention;

[0022] Figure 8 yes Figure 7 An enlarged schematic diagram of a local area of ​​a light source module.

[0023] Description of Reference Numerals

[0024] 10, 10A: display device;

[0025] 100: reflective display panel;

[0026] 100ds: display surface;

[0027] 150, 250: adhesive layer;

[0028] 200, 200B: light source module;

[0029] 210: light guide plate;

[0030] 210is: light incident side;

[0031] 210s1: first surface;

[0032] 210s2: second surface;

[0033] 210ss, 230ss, 240ss: side;

[0034] 220: light source;

[0035] 230, 230A, 230B: anti-adsorption and adhesion layer;

[0036] 230s: surface;

[0037] 235: protrusion;

[0038] 240: light-transmitting substrate;

[0039] 240s: substrate surface;

[0040] 260: cover plate;

[0041] 270, 270B: adhesive layer;

[0042] AA: action area;

[0043] D: particle size;

[0044] GAP: micro gap;

[0045] H: height;

[0046] MG: microgrooves;

[0047] MP: microparticles;

[0048] NAA: non-active area;

[0049] t: thickness;

[0050] W: width;

[0051] X, Z: direction. DETAILED DESCRIPTION

[0052] 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.

[0053] The foregoing and other technical aspects, features, and benefits of the present invention will be more clearly understood in the following detailed description of a preferred embodiment with reference to the accompanying drawings. Directional terms such as up, down, left, right, front, and back, used in the following embodiments, are merely references to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0054] Figure 1 FIG. 1 is a schematic top view of a light source module according to a first embodiment of the present invention. Figure 2 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention. Figure 3 yes Figure 2 An enlarged schematic diagram of a local area of ​​a light source module. Figure 4 yes Figure 3 A cross-sectional schematic diagram of an anti-adsorption and adhesion layer of another modified embodiment. Figure 5 yes Figure 3 A cross-sectional view of an anti-adsorption and adhesion layer of another modified embodiment. Figure 1 The light source module 200 omits Figure 2The anti-adsorption and adhesion layer 230, the light-transmitting substrate 240, the adhesive layer 250 and the cover plate 260 are shown.

[0055] Please refer to Figure 1 、 Figure 2 and Figure 3 The display device 10 may include a reflective display panel 100 and a light source module 200. The light source module 200 is adapted to be disposed above the display surface 100ds of the reflective display panel 100. In other words, in this embodiment, the light source module 200 may serve as a front light module for the display device 10 to meet the illumination requirements of the reflective display panel 100 when ambient light is insufficient. For example, the light source module 200 may be bonded to the reflective display panel 100 via an adhesive layer 150, and the adhesive layer 150 may be made of, for example, an optically clear adhesive (OCA) or an optically clear resin (OCR).

[0056] The light source module 200 includes a light guide plate 210, a light source 220, and a plurality of microgrooves MG. The light guide plate 210 overlaps the display surface 100ds of the reflective display panel 100. The overlapping relationship herein refers to, for example, the overlap of the light guide plate 210 and the display surface 100ds along a normal direction (e.g., direction Z) of the display surface 100ds. Unless otherwise specified, the overlapping relationship between the two components is defined in the same manner, and the overlapping direction is not further described.

[0057] Specifically, the light guide plate 210 includes a light incident surface 210is, and a first surface 210s1 and a second surface 210s2 connected to and opposite to the light incident surface 210is. The light source 220 is disposed adjacent to and on one side of the light incident surface 210is of the light guide plate 210. The light guide plate 210 may be made of, for example, glass, polycarbonate (PC), poly(methyl methacrylate) (PMMA), or other suitable optically-grade, transparent materials.

[0058] The light source 220 is adapted to emit illumination light (not shown) toward the light incident surface 210is. A plurality of microgrooves MG are provided on the first surface 210s1 of the light guide plate 210, and the second surface 210s2 thereof faces the display surface 100ds of the reflective display panel 100. These microgrooves MG are recessed from the first surface 210s1. The aforementioned illumination light enters the light guide plate 210 through the light incident surface 210is, propagates laterally within the light guide plate 210, and is reflected by the optical surface of the light guide plate 210 defining these microgrooves MG. After that, it is emitted from the second surface 210s2 of the light guide plate 210 and illuminates the display surface 100ds of the reflective display panel 100, thereby serving as illumination light for the reflective display panel 100 when ambient light is insufficient.

[0059] To protect the light guide plate 210 from damage due to operation or unexpected external forces, the light source module 200 further includes a cover plate 260 disposed on one side of the first surface 210s1 of the light guide plate 210. It is particularly important to note that the connection between the cover plate 260 and the light guide plate 210 is achieved through a composite material layer consisting of an anti-adhesion layer 230, a light-transmitting substrate 240, an adhesive layer 250, and an adhesive layer 270.

[0060] In detail, the light-transmitting substrate 240 is arranged between the light guide plate 210 and the cover plate 260. That is, the cover plate 260 is arranged on the side of the light-transmitting substrate 240 facing away from the light guide plate 210. The adhesive layer 250 connects the cover plate 260 and the light-transmitting substrate 240, that is, the cover plate 260 is bonded to the light-transmitting substrate 240 via the adhesive layer 250. It should be noted that in addition to being used to connect the cover plate 260 and the light-transmitting substrate 240, the adhesive layer 250 is also suitable for flattening the unevenness existing on the cover plate 260 and the light guide plate 210 at a microscopic scale to avoid the generation of bubbles that affect the visual effect. The material of the light-transmitting substrate 240 includes, for example, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), or other suitable flexible plastic materials. The material of the adhesive layer 250 includes, for example, optically clear adhesive (OCA) or optically clear resin (OCR).

[0061] It should be noted that an anti-adsorption and adhesion layer 230 is provided between the light-transmitting substrate 240 and the light guide plate 210. Since the surface energy of the surface 230s of the anti-adsorption and adhesion layer 230 facing the light guide plate 210 is less than 300 mJ / m 2 , which can avoid the phenomenon of adsorption or adhesion between the transparent substrate 240 and the light guide plate 210, thereby preventing the image of the reflective display panel 100 from being abnormal or distorted.

[0062] For example, the anti-adhesion layer 230 may be made of materials such as methyl silicate, silane-siloxane, octyltrichlorosilane, tungsten disulfide (WS2), Teflon (PTFE), or antistatic coatings, and may be formed on the light-transmitting substrate 240 by coating. The anti-adhesion layer 230 formed by coating with these materials may have a thickness ranging from 50 nm to 5000 nm, a surface 230s having a coefficient of friction less than 0.5, and an arithmetic mean roughness (Ra) less than 0.1 μm.

[0063] It is particularly important to note that before applying the anti-adhesion layer 230, the surface of the transparent substrate 240 to be coated can be modified using plasma treatment technology to form a nanometer-scale surface roughness on the surface to be coated. This can improve the film quality of the anti-adhesion layer 230 on the transparent substrate 240.

[0064] However, the present invention is not limited thereto. In another variant embodiment, the anti-adsorption and adhesion layer 230A having an uneven surface can also be formed chemically or physically, such as Figure 4 As shown. For example, in a modified embodiment, the surface 230s of the anti-adsorption and adhesion layer 230A may be provided with a plurality of protrusions 235, and the profiles of these protrusions 235 (e.g., the orthographic projection profile on the XZ plane) may be different from each other. Each of these protrusions 235 has a width W along any direction parallel to the surface 230s (e.g., direction X) and a height H relative to the surface 230s along the normal direction of the surface 230s (e.g., direction Z). Preferably, the width W may be greater than 0 μm and less than or equal to 20 μm, and the height H may be greater than 0 μm and less than or equal to 10 μm.

[0065] Please refer to Figure 5 In another variant embodiment, the anti-adhesion layer 230B can be made of a multifunctional (meth)acrylate, urethane, thermoplastic elastomer, cycloolefin copolymer, or other suitable resin material, and can be added with a plurality of microparticles MP. For example, these microparticles MP can be dispersed in the resin material and formed on the light-transmitting substrate 240 by coating. As a result, the anti-adhesion layer 230B formed will form very small spherical protrusions on its surface 230s. The anti-adhesion layer 230B formed in this manner can have a film thickness of less than or equal to 50 μm, and the particle size D of the microparticles MP can be less than or equal to 20 μm.

[0066] Please refer to Figure 1 、 Figure 2 and Figure 3In this embodiment, the adhesive layer 270 is disposed between the anti-adhesion layer 230 and the light guide plate 210, and is used to connect the anti-adhesion layer 230 and the light guide plate 210. Specifically, the first surface 210s1 of the light guide plate 210 defines an active area AA and a non-active area NAA located peripherally to the active area AA. For example, in this embodiment, the non-active area NAA may surround the active area AA, but this is not a limitation.

[0067] It is particularly noteworthy that both the active area AA and the non-active area NAA of the first surface 210s1 are covered by the anti-adhesion layer 230. In other words, the anti-adhesion layer 230 completely covers the first surface 210s1. However, the adhesive layer 270 only covers the non-active area NAA of the first surface 210s1 and does not cover the active area AA. In other words, in this embodiment, the adhesive layer 270 is disposed around the active area AA.

[0068] On the other hand, in this embodiment, the first surface 210s1 of the light guide plate 210 has a first roughness and a second roughness in the active area AA and the non-active area NAA, respectively, and the second roughness of the first surface 210s1 in the non-active area NAA is greater than the first roughness in the active area AA (e.g. Figure 3 ), where the roughness is, for example, the arithmetic mean roughness (Ra), but is not limited thereto. Therefore, a micro-gap GAP can be defined between the first surface 210s1 of the light guide plate 210 in the inactive area NAA and the surface 230s of the anti-adhesion layer 230, and the adhesive layer 270 fills the micro-gap GAP. For example, the thickness t of any portion of the micro-gap GAP along the normal direction (e.g., direction Z) of the first surface 210s1 can be less than or equal to 30 μm.

[0069] It is particularly noted that by roughening the surface of the non-active area NAA of the light guide plate 210 , the adhesion between the adhesive layer 270 and the light guide plate 210 can be effectively improved. For example, the peeling force between the two can reach more than 200g / 25mm.

[0070] However, the present invention is not limited to this. In another embodiment, the anti-adsorption and adhesion layer can also be fixed on the light guide plate by surface melting / melting. The surface melting / melting method can be a physical method (such as heating) or a chemical method (such as solvent), and can be a single-sided or double-sided processing method. In addition, the melting / melting position can be any area in the non-active area or the active area and without micro-grooves. For example, in the process of bonding the anti-adsorption and adhesion layer to the light guide plate, a heating element (such as a laser system) can be used to heat (such as irradiate) local areas of two surfaces located on the anti-adsorption and adhesion layer and the light guide plate and opposite to each other. After the two surfaces are melted, the anti-adsorption and adhesion layer and the light guide plate are pressed together to achieve a fixed relationship between the anti-adsorption and adhesion layer and the light guide plate.

[0071] Some other embodiments will be listed below to illustrate the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the aforementioned embodiments and will not be repeated below.

[0072] Figure 6 FIG. 1 is a schematic top view of a light source module according to a second embodiment of the present invention. Figure 7 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. Figure 8 yes Figure 7 An enlarged schematic diagram of a local area of ​​the light source module. For clear presentation, Figure 6 The light source module 200B omits Figure 7 The anti-adsorption and adhesion layer 230, the light-transmitting substrate 240, the adhesive layer 250 and the cover plate 260 are shown.

[0073] Please refer to Figure 6 、 Figure 7 and Figure 8 The display device 10A of this embodiment is Figure 2 The only difference between the display device 10 is that the configuration of the adhesive layer of the light source module is different. Specifically, the light guide plate 210 of the light source module 200B also has a side 210ss connecting the first surface 210s1 and the second surface 210s2. The anti-adsorption adhesion layer 230 also has a side 230ss connecting the surface 230s. The light-transmitting substrate 240 has a substrate surface 240s connected to the anti-adsorption adhesion layer 230 and a side 240ss connected to the substrate surface 240s. It is particularly noteworthy that in this embodiment, in addition to filling the micro gap GAP between the anti-adsorption adhesion layer 230 and the light guide plate 210, the adhesive layer 270B further extends from the micro gap GAP to cover the side 210ss of the light guide plate 210, the side 230ss of the anti-adsorption adhesion layer 230 and the side 240ss of the light-transmitting substrate 240 (such as Figure 8 As shown in FIG. 1 , the fixing relationship between the anti-adsorption and adhesion layer 230 and the light guide plate 210 can be further strengthened.

[0074] However, the present invention is not limited thereto. In another variant embodiment, the adhesive layer may further cover the side surfaces of the reflective display panel 100 (or adhesive layer 150) and the side surfaces of the adhesive layer 250. It is particularly noted that in this embodiment, the adhesive layer 270B does not cover the side surface of the light guide plate 210 facing the light source 220 (i.e., the light incident surface 210is). In other words, the adhesive layer 270B in this embodiment does not surround the active area AA of the light guide plate 210.

[0075] In summary, in a light source module according to an embodiment of the present invention, an anti-adsorption and adhesion layer is provided between the light guide plate and the cover plate. Since the surface energy of the anti-adsorption and adhesion layer facing the light guide plate is less than 300 mJ / m 2 This prevents adsorption or adhesion between the transparent substrate and the light guide plate, which could cause image distortion or anomalies in the reflective display panel. Furthermore, the adhesive layer connecting the transparent substrate and the cover plate is also suitable for flattening microscopic unevenness between the cover plate and the light guide plate, preventing the formation of bubbles that could affect visual quality.

[0076] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above 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 source module, characterized in that: include: The light guide plate has a light incident surface and a first surface connected to each other, wherein the first surface is provided with an active area and a non-active area located outside the active area; a light source, disposed on one side of the light incident surface of the light guide plate and adjacent to the light incident surface; a plurality of micro grooves, disposed on the first surface of the light guide plate and located within the active area; A light-transmitting substrate is disposed on the first surface; a cover plate, disposed on a side of the light-transmitting substrate facing away from the light guide plate; an adhesive layer connecting the cover plate and the light-transmitting substrate, wherein the light source module is adapted to be disposed on a display surface of a reflective display panel, the second surface of the light guide plate faces the display surface, and the second surface is connected to the light incident surface and opposite to the first surface; The anti-adsorption and adhesion layer is disposed between the light-transmitting substrate and the light guide plate and covers the active area and the non-active area of ​​the first surface. The surface energy of the anti-adsorption and adhesion layer facing the light guide plate is less than 300 mJ / m 2 ; as well as The adhesive layer is disposed between the anti-adsorption and adhesion layer and the light guide plate, and the adhesive layer covers the non-active area of ​​the first surface but does not cover the active area of ​​the first surface.

2. The light source module according to claim 1, wherein: The first surface of the light guide plate has a first roughness and a second roughness in the active area and the non-active area respectively, and the second roughness is greater than the first roughness.

3. The light source module according to claim 2, wherein: A micro gap is defined between the first surface of the light guide plate and the surface of the anti-adsorption and adhesion layer in the non-active area, and the adhesive layer is filled in the micro gap.

4. The light source module according to claim 3, wherein: The light guide plate also has a first side surface adjacent to or relative to the light incident surface, the first side surface is connected to the first surface, the light-transmitting substrate has a substrate surface connected to the anti-adsorption adhesion layer and a second side surface connected to the substrate surface, and the adhesive layer extends from the micro-gap to cover the first side surface of the light guide plate and the second side surface of the light-transmitting substrate.

5. The light source module according to claim 3, wherein: A thickness of the micro slit along a normal direction of the first surface is less than or equal to 30 μm.

6. The light source module according to claim 1, wherein: The material of the anti-adsorption and adhesion layer includes methyl silicate, silane-siloxane, octyltrichlorosilane, tungsten disulfide, Teflon or antistatic coating.

7. The light source module according to claim 6, wherein: The arithmetic mean roughness of the surface of the anti-adsorption and adhesion layer is less than 0.1 μm.

8. The light source module according to claim 1, wherein: The material of the anti-adsorption and adhesion layer includes multifunctional acrylate, urethane, thermoplastic elastomer or cycloolefin copolymer.

9. The light source module according to claim 8, wherein: The anti-adsorption and adhesion layer is dispersed with a plurality of microparticles, and the particle size of each of the microparticles is less than or equal to 20 μm.

10. The light source module according to claim 1, wherein: The surface of the anti-adsorption and adhesion layer is provided with a plurality of protrusions, each of the plurality of protrusions has a height relative to the surface along the normal direction of the surface and a width along any direction parallel to the surface, the height is greater than 0 μm and less than or equal to 10 μm, and the width is greater than 0 μm and less than or equal to 20 μm.

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