Light guide plate and backlight module thereof

Abstract

The invention discloses a light guide plate and a backlight module thereof. The light guide plate comprises a light incident surface, a first surface, a second surface and a plurality of side surfaces. The first surface is approximately perpendicular to the light-in surface and serves as a light-out surface of the light guide plate. The second surface is located on the other side opposite to the first surface, and the glossiness of the second surface is larger than 95. The plurality of side surfaces are not parallel to the first surface and are connected with the first surface and the second surface, and the glossiness of at least one of the plurality of side surfaces is greater than 95.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a light guide plate and a backlight module thereof. Background Art

[0002] Backlight modules have been widely used in display technology. In the existing backlight module design, whether it is a direct-lit or side-lit backlight module, its basic components will at least include components such as a light guide plate, a diffuser plate and a reflector plate to guide and diffuse the light, so that the light can be evenly irradiated to each area of ​​the display panel to achieve a better display effect.

[0003] As one of the key components of the backlight module, the light guide plate is usually made of plastic material. However, there are many problems with traditional light guide plate materials, some of which include poor optical performance, difficult processing, high production cost, and considerations of the heat resistance and stability of the material itself. In addition, since the backlight module must use additional components such as diffusers and reflectors to optimize optical performance, these additional components increase costs and manufacturing difficulties during the production process, and there will also be reliability issues in the assembly between components. Summary of the invention

[0004] The object of the present invention is to provide a light guide plate and a backlight module thereof to solve the above problems.

[0005] An embodiment of the present invention provides a light guide plate, comprising a light incident surface, a first surface, and a second surface. The first surface of the light guide plate is substantially perpendicular to the light incident surface and serves as a light emitting surface of the light guide plate, wherein the glossiness of the first surface is less than 1. The second surface of the light guide plate is located on the other side opposite to the second surface, wherein the glossiness of the second surface is greater than 95.

[0006] An embodiment of the present invention provides a backlight module suitable for providing a backlight source for a display panel. The backlight module is composed of a light guide plate and a light enhancement plate. The light guide plate includes a light incident surface, a first surface, and a second surface. The first surface of the light guide plate is substantially perpendicular to the light incident surface and serves as a light emitting surface of the light guide plate, wherein the glossiness of the first surface is less than 1. The second surface of the light guide plate is located on the other side opposite to the second surface, wherein the glossiness of the second surface is greater than 95.

[0007] An embodiment of the present invention provides a light guide plate, comprising a light incident surface, a first surface, a second surface, and a plurality of side surfaces. The first surface is substantially perpendicular to the light incident surface and serves as a light emitting surface of the light guide plate. The second surface is located on the other side relative to the first surface, wherein the glossiness of the second surface is greater than 95. The plurality of side surfaces are not parallel to the first surface and are connected to the first surface and the second surface, wherein the glossiness of at least one of the plurality of side surfaces is greater than 95.

[0008] In some embodiments of the present invention, a plurality of reflective film structures are formed on the light incident surface of the light guide plate, and the plurality of reflective film structures are arranged at fixed intervals, wherein the glossiness of each of the reflective film structures is greater than 95.

[0009] An embodiment of the present invention provides a backlight module, comprising the aforementioned light guide plate and a light emitting unit. The light emitting unit is disposed toward the light incident surface and comprises a plurality of light emitting elements, wherein the plurality of light emitting elements are arranged at fixed intervals.

[0010] In some embodiments of the present invention, a plurality of reflective film structures are formed on the light incident surface, and each of the reflective film structures is formed in a spacing region between adjacent light emitting elements.

[0011] Through the technical solution described in the present invention, the light guide plate and the backlight module thereof proposed in the embodiment of the present invention can effectively simplify the manufacturing process of the backlight module, thereby improving the production efficiency. At the same time, because the configuration of the diffusion plate and the reflection plate can be omitted, the influence of light uniformity and durability considerations that may be caused when connecting between components can also be improved at the same time.

[0012] In addition, by extending the reflective portion to the side surface of the light guide plate, the light source utilization rate of the light emitting portion can be further improved, so that the brightness of the backlight module can be further improved. Furthermore, by arranging a reflective film structure corresponding to the interval area between the light emitting elements on the light incident surface, the dark area problem of the light emitting portion can be improved, so that the light emitting effect of the backlight module is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a display device according to an embodiment of the present invention;

[0014] FIG. 2A to FIG. 2E Schematic diagram of the structure configuration of the backlight module according to different embodiments of the present invention;

[0015] FIG. 3A to FIG. 3D Schematic diagrams of configurations of light guide plates according to different embodiments of the present invention; and

[0016] Figure 4A and Figure 4B Schematic diagrams of light incident surface coating structures according to different embodiments of the present invention. DETAILED DESCRIPTION

[0017] The present invention proposes a light guide plate and a backlight module thereof, which can simultaneously possess the optical properties of a diffuser plate and a reflector plate, so that the manufacturing process of the backlight module can be effectively simplified. In order to make the above-mentioned purposes, features and advantages of the technical solution more obvious and easy to understand, the specific embodiments of the proposed technical solution are described in detail below in conjunction with the accompanying drawings. The following descriptions of the various embodiments of the technical solution of the present invention are only for illustration and illustration, and do not represent all embodiments of the present invention or limit the present invention to specific embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0018] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only intended to indicate relative positional relationships based on the accompanying drawings, and are not intended to limit the elements using the terms to only be implemented in a representative manner. When the absolute position of the object being described changes, the description of the relative position may also change accordingly.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] Figure 1 FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. Figure 1 The display device 10 of the present embodiment may be a non-self-luminous display device, such as a liquid crystal display device (LCD device), which includes a backlight module 100 and a display panel DP, wherein the backlight module 100 and the display panel DP are arranged on the xy plane, and the display panel DP is arranged on the backlight module 100 along the z axis. The backlight module 100 is used to provide sufficient brightness and uniformly distributed light to the display panel DP. The display panel DP is used to control and adjust the light passing therethrough, so as to present a corresponding image thereon. In the present embodiment, the display device 10 may be any electronic device having a display function, such as a television, a screen, a laptop computer or a mobile phone, but the present invention is not limited thereto.

[0021] The backlight module 100 includes a light emitting portion 110, wherein the light emitting portion 110 includes a plurality of light emitting elements LEDs arranged in an array. The light emitting elements LEDs can be used to emit light toward the display panel DP. In some embodiments, the light emitting elements LEDs can be white light, red light, green light or blue light emitting diodes (or light emitting diodes with a wavelength between white light, red light, green light or blue light), or a combination of the above light emitting diodes, but the present invention is not limited thereto.

[0022] In addition, in some embodiments, the backlight module 100 may further include a quantum dot film 120 and an optical adjustment layer 130, wherein the quantum dot film 120 is disposed on the light emitting portion 110, and the optical adjustment layer 130 is disposed on the quantum dot film 120, that is, the quantum dot film 120 is disposed between the light emitting portion 110 and the optical adjustment layer 130. In the embodiment provided with the quantum dot film 120, the light emitting element LEDs may be, for example, blue light emitting diodes.

[0023] The quantum dot film 120 is disposed on the light transmission path of the light emitting portion 110, and is used to adjust the wavelength of a portion of the light emitted by the light emitting element LEDs, and allows another portion of the light emitted by the light emitting element LEDs to pass directly without adjustment. For example, when the light emitting element LEDs emit light in the blue light wavelength range (e.g., 400nm to 520nm), the quantum dot film 120 can adjust the wavelength of the first portion of the received light to the red light wavelength range (e.g., 610nm to 720nm), adjust the wavelength of the second portion of the received light to the green light wavelength range (e.g., 520nm to 610nm), and directly output the third portion of the received light without adjustment, that is, maintaining it in the blue light wavelength range. In this way, the first to third portions of light emitted by the light emitting portion 110 can be mixed to form white light after passing through the quantum dot film 120.

[0024] The optical adjustment layer 130 is also located on the light transmission path of the light emitting unit 110 and is used to adjust the direction of the received light so that the transmitted light source is more uniform. In some embodiments, the optical adjustment layer 130 includes a plurality of optical microstructures and / or optical films for adjusting the direction of the light (further described in subsequent embodiments), but the present invention is not limited thereto.

[0025] The display panel DP includes, for example, a pixel array substrate, an opposite substrate, and a non-self-luminous display medium, wherein the pixel array substrate and the opposite substrate are arranged opposite to each other, and the non-self-luminous display medium is arranged between the pixel array substrate and the opposite substrate. In some embodiments, the non-self-luminous display medium may be, for example, liquid crystal, but the present invention is not limited thereto.

[0026] FIG. 2A to FIG. 2CSchematic diagram of the structure configuration of the backlight module according to different embodiments of the present invention, wherein Figure 2A The structure configuration of the direct-lit backlight module 100a, and Figure 2B and Figure 2C The backlight modules 100b and 100c are of the side-light type.

[0027] Please refer to Figure 2A , the backlight module 100a includes a light emitting portion 110a and an optical adjustment layer 130a, wherein the optical adjustment layer 130a includes a light guide plate 131a, a diffuser plate 132 and a reflector plate 133. In the present embodiment, the diffuser plate 132, the light guide plate 131a, the light emitting portion 110a and the reflector plate 133 are arranged in sequence from the side close to the display panel DP to the side far from the display panel DP on the z-axis, and the components are substantially parallel to each other. In other words, in the backlight module 100a, the diffuser plate 132 is closest to the display panel DP, and the reflector plate 133 is farthest from the display panel DP. From the perspective that the display panel DP is located at the uppermost side, it can be regarded that the light emitting portion 110a is arranged on the upper side of the reflector plate 133, the light guide plate 131a is arranged on the upper side of the light emitting portion 110a, and the diffuser plate 132 is arranged on the upper side of the light guide plate 131a.

[0028] In some embodiments, the optical adjustment layer 130a may further include a light enhancement plate 134, wherein the light enhancement plate 134 is disposed on the upper side of the diffusion plate 132, that is, disposed between the display panel DP and the diffusion plate 132. In other words, in the embodiment with the light enhancement plate 134, the component closest to the display panel DP in the backlight module 100a may be the light enhancement plate 134. However, the present invention is not limited thereto.

[0029] Specifically, the light guide plate 131a is used to refract and / or reflect the light source provided by the light emitting portion 110a so that the light can be uniformly emitted from the light emitting surface of the light guide plate 131a. In other words, after the light source provided by the light emitting portion 110a passes through the light guide plate 131a, the light emitted toward the display panel DP can be more evenly emitted to each area of ​​the display panel DP compared to when there is no light guide plate 131a. In the present embodiment, the light emitting surface of the light guide plate 131a is the surface close to one side of the display panel DP; and the light incident surface of the light guide plate 131a is located on the other side opposite to the light emitting surface, that is, the surface close to the light emitting portion 110a. In other words, the backlight module 100a of the present embodiment is a direct-down configuration.

[0030] The light guide plate 131a of this embodiment may be made of any transparent material, such as glass or plastic material (such as PMMA, MS, PS, etc.), wherein the light guide plate 131a may include a plurality of optical microstructures, but the invention is not limited thereto.

[0031] The diffuser 132 is used to diffuse and refract the received light, so that the light can be further dispersed and evenly distributed to the entire display panel DP. In the configuration of this embodiment, one side of the diffuser 132 is configured on the light emitting surface of the light guide plate 131a, and the other side is configured corresponding to the display panel DP, so that the light emitted from the light emitting surface of the light guide plate 131a will be further and more evenly dispersed to each area of ​​the display panel DP after passing through the diffuser 132.

[0032] The diffuser plate 132 of this embodiment can be made of a plastic sheet or other transparent material with a roughened surface, but the invention is not limited thereto. The diffuser plate 132 can be connected / assembled with the light guide plate 131a by gluing or other bonding methods, but the invention is not limited thereto.

[0033] The reflector 133 is used to reflect the received light through an optical effect, so that the light not directed toward the display panel DP can be reflected into the light directed toward the display panel DP, thereby improving the light source utilization rate of the light emitting unit 110a. In the configuration of this embodiment, the light emitting unit 110a is configured on the reflective surface of the reflector 133, wherein part of the light emitted by the light emitting unit 110a through the light guide plate 131a is emitted in a direction that is not parallel to the z-axis (i.e., not directed toward the display panel DP).

[0034] The reflective plate 133 of the present embodiment can be implemented by using aluminum foil or a reflective material with a metal coating, wherein the reflective plate 133 can be connected / assembled with the light guide plate 131a by pasting or other bonding methods, but the present invention is not limited thereto. It should be noted that although the reflective plate 133 of the present embodiment is illustrated as a sheet, the present invention is not limited thereto. In some embodiments, the reflective plate can extend to the side of the light emitting portion 110a in response to the packaging structure of the backlight module 100a, thereby improving the reflection efficiency.

[0035] In the embodiment of the backlight module 100a including the light-enhancing plate 134, the light-enhancing plate 134 is used to increase the amount and incident angle of light through the optical effects of refraction and reflection, so that the received light can be further diffused toward the display panel DP, thereby improving the brightness and viewing angle of the overall light source. In the configuration of this embodiment, the light-enhancing plate 134 is configured on the diffusion plate 132 and is located between the display panel DP and the diffusion plate 132.

[0036] The light enhancement plate 134 of this embodiment can be implemented by using a transparent material coated with a high refractive index material, but the invention is not limited thereto. The light enhancement plate 134 can be connected / assembled with the diffusion plate 132 by gluing or other bonding methods, but the invention is not limited thereto.

[0037] More specifically, in the backlight module 100a, the light emitted by the light emitting portion 110a is emitted from the light emitting surface thereof through the optical effect of the light guide plate 131a, and is sequentially provided to the display panel DP through the diffusion plate 132 and the light enhancement plate 134. In addition, the light diffused from the periphery of the light emitting portion 110a and / or the light guide plate 131a and other components is reflected back to the light guide plate 131a by the reflection plate 133, and the light is emitted to the display panel DP through a light path similar to the above.

[0038] Please refer to Figure 2B The backlight module 100b includes a light emitting portion 110b and an optical adjustment layer 130b, wherein the optical adjustment layer 130b includes a light guide plate 131b, a diffuser plate 132, and a reflector plate 133. In the present embodiment, the diffuser plate 132, the light guide plate 131b, and the reflector plate 133 are arranged in sequence from the side close to the display panel DP to the side far from the display panel DP on the z-axis, and the components are substantially parallel to each other. The light emitting portion 110b is arranged on the side of the light guide plate 131b, wherein the light emitting direction of the light emitting portion 110b is not parallel to the normal direction of the planes of the diffuser plate 132, the light guide plate 131b, and the reflector plate 133. More specifically, the light emitting direction of the light emitting portion 110b of the present embodiment may be substantially perpendicular to the normal direction of the planes of the diffuser plate 132, the light guide plate 131b, and the reflector plate 133. In the backlight module 100b, the diffuser 132 is closest to the display panel DP, and the reflector 133 is farthest from the display panel DP. From the viewpoint that the display panel DP is located at the uppermost side, it can be considered that the light guide plate 131b is disposed on the upper side of the reflector 133, the diffuser 132 is disposed on the upper side of the light guide plate 131b, and the light emitting portion 110b is disposed on the side of the light guide plate 131b.

[0039] In some embodiments, the optical adjustment layer 130b may also include a light enhancement plate 134, wherein the light enhancement plate 134 is disposed on the upper side of the diffusion plate 132, that is, disposed between the display panel DP and the diffusion plate 132. In other words, in the embodiment with the light enhancement plate 134, the component closest to the display panel DP in the backlight module 100b may be the light enhancement plate 134. However, the present invention is not limited thereto.

[0040] Specifically, the light guide plate 131b is used to refract and / or reflect the light source provided by the light emitting portion 110b so that the light can be uniformly emitted from the light emitting surface of the light guide plate 131b. In other words, after the light source provided by the light emitting portion 110b passes through the light guide plate 131b, the light emitted toward the display panel DP can be more evenly emitted to each area of ​​the display panel DP compared to when there is no light guide plate 131b. In the present embodiment, the light emitting surface of the light guide plate 131b is the surface close to the display panel DP; and the light incident surface of the light guide plate 131b is the side surface that is perpendicular / non-parallel to the light emitting surface, that is, the surface close to the light emitting portion 110b. In other words, compared to the aforementioned Figure 2A In the embodiment, the backlight module 100b of the present embodiment is of a side-lighting type. Figure 2B The light emitting portion 110b is shown to be disposed on the right side of the light guide plate 131b, but the present invention is not limited thereto. In other embodiments, the light emitting portion 110b may also be disposed on other sides of the light guide plate (such as the left side, top side, and bottom side in the figure).

[0041] For details about the structure and connection configuration of the light guide plate 131b of this embodiment, please refer to the above Figure 2A The description of the light guide plate 131a of the embodiment will not be repeated here.

[0042] The diffuser 132 is used to diffuse and refract the received light, so that the light can be further dispersed and evenly distributed to the entire display panel DP. In the configuration of this embodiment, one side of the diffuser 132 is configured on the light emitting surface of the light guide plate 131b, and the other side is configured corresponding to the display panel DP, so that the light emitted from the light emitting surface of the light guide plate 131b will be further and more evenly dispersed to each area of ​​the display panel DP after passing through the diffuser 132.

[0043] For the structural composition / connection configuration of the diffuser plate 132 of this embodiment, please refer to the above Figure 2A The description of the embodiments will not be repeated here.

[0044] The reflector 133 is used to reflect the received light through an optical effect, so that the light not directed toward the display panel DP can be reflected into the light directed toward the display panel DP, thereby improving the light source utilization rate of the light emitting portion 110b. In the configuration of this embodiment, the light guide plate 131b is configured on the reflector 133, wherein the surface of the light guide plate 131b opposite to the light emitting surface faces the reflective surface of the reflector 133, so that part of the light emitted by the light guide plate 131b that is not directed toward the display panel DP is reflected to the light guide plate 131b.

[0045] For the structural composition / connection configuration embodiment of the reflector 133 of this embodiment, please refer to the above Figure 2A The description of the embodiments will not be repeated here.

[0046] In the embodiment of the backlight module 100b including the light-increasing plate 134, the light-increasing plate 134 is used to increase the amount and incident angle of light through the optical effects of refraction and reflection, so that the received light can be further diffused toward the display panel DP, thereby improving the brightness and viewing angle of the overall light source. In the configuration of this embodiment, the light-increasing plate 134 is configured on the diffusion plate 132 and is located between the display panel DP and the diffusion plate 132.

[0047] For the structural composition / connection configuration of the brightness enhancement plate 134 of this embodiment, please refer to the above Figure 2A The description of the embodiments will not be repeated here.

[0048] More specifically, in the backlight module 100b, the light emitted by the light emitting portion 110b is emitted from the light emitting surface thereof through the optical effect of the light guide plate 131b, and is sequentially provided to the display panel DP through the diffusion plate 132 and the light enhancement plate 134. In addition, the light diffused from the periphery of the light emitting portion 110b and / or the light guide plate 131b and other components is reflected back to the light guide plate 131b by the reflection plate 133, and the light is emitted to the display panel DP through a light path similar to the above.

[0049] Compared to Figure 2A For the direct-type backlight module 100a, the light emitting portion 110b of the backlight module 100b of this embodiment is located at the side of the light guide plate 131b instead of overlapping with the light guide plate 131b / reflection plate 133, so the thickness of the backlight module 100b can be effectively reduced.

[0050] Please refer to Figure 2C The backlight module 100c includes a light emitting portion 110c and an optical adjustment layer 130c. Figure 2A and Figure 2B , the optical adjustment layer 130c of this embodiment may only include the light guide plate 131c and the reflective plate 133. Specifically, the light emitting surface (i.e., the light emitting surface or the surface close to the display panel DP) of the light guide plate 131c of this embodiment is specially surface-treated so that the light emitting surface of the light guide plate 131c has the optical properties of the diffusion plate (such as 132), so the backlight module 100c of this embodiment can omit the configuration of the diffusion plate, and the optical adjustment layer 130c only includes the light guide plate 131c and the reflective plate 133.

[0051] In some embodiments, the optical adjustment layer 130c may also include a light enhancement plate 134, wherein the light enhancement plate 134 is disposed on the upper side of the light guide plate 131c, that is, disposed between the display panel DP and the light guide plate 131c, and one side of the light enhancement plate 134 is oriented toward the light emitting surface of the light guide plate 131c, and the other side of the light enhancement plate 134 is oriented toward the display panel DP. In other words, in the embodiment with the light enhancement plate 134, the component closest to the display panel DP in the backlight module 100c may be the light enhancement plate 134. However, the present invention is not limited thereto.

[0052] More specifically, the light guide plate 131c of this embodiment is made of glass material, which is a material that is transparent, brittle and has a certain hardness. The upper surface of the light guide plate 131c has the optical properties of a diffuser after surface treatment. Figure 2A and Figure 2B The diffusion plate 132 can be omitted in the backlight module 100c of this embodiment.

[0053] Please refer to Figure 2D The backlight module 100d includes a light emitting portion 110d and an optical adjustment layer 130d. Figure 2A and Figure 2B , the optical adjustment layer 130d of this embodiment may only include the light guide plate 131d and the diffuser plate 132. Specifically, the surface of the light guide plate 131d of this embodiment opposite to the light emitting surface is specially surface treated so that the light guide plate 131d may have the optical properties of the reflector plate (such as 133), so the backlight module 100d of this embodiment may omit the configuration of the reflector, and the optical adjustment layer 130d may only include the light guide plate 131d and the diffuser plate 132.

[0054] In some embodiments, the optical adjustment layer 130d may also include a light enhancement plate 134, wherein the light enhancement plate 134 is disposed on the upper side of the diffusion plate 132, that is, disposed between the display panel DP and the diffusion plate 132. In other words, in the embodiment with the light enhancement plate 134, the component closest to the display panel DP in the backlight module 100d may be the light enhancement plate 134. However, the present invention is not limited thereto.

[0055] More specifically, this embodiment also adopts a light guide plate 131d made of glass, and the surface on the other side opposite to the light emitting surface is surface-treated so that the surface has the optical properties of a reflector. Figure 2A and Figure 2B The reflector 133 can be omitted in the backlight module 100d of this embodiment. Figure 2E The backlight module 100e includes a light emitting portion 110e and an optical adjustment layer 130e. Figure 2Aand Figure 2B , the optical adjustment layer 130e of this embodiment may only include the light guide plate 131e. Specifically, the upper surface (i.e., the light emitting surface or the surface close to the display panel DP) and the lower surface (i.e., the other side surface opposite to the light emitting surface) of the light guide plate 131e of this embodiment are respectively subjected to special surface treatments, so that the light guide plate 131e can have the optical properties of both the diffusion plate (such as 132) and the reflection plate (such as 133). Therefore, the backlight module 100e of this embodiment can omit the configuration of the diffusion plate and the reflection plate, and the optical adjustment layer 130e only includes the light guide plate 131e.

[0056] In some embodiments, the optical adjustment layer 130e may also include a light enhancement plate 134, wherein the light enhancement plate 134 is disposed on the upper side of the light guide plate 131e, that is, disposed between the display panel DP and the light guide plate 131e, and one side of the light enhancement plate 134 faces the light emitting surface of the light guide plate 131e, and the other side of the light enhancement plate 134 faces the display panel DP. In other words, in the embodiment with the light enhancement plate 134, the component closest to the display panel DP in the backlight module 100e may be the light enhancement plate 134. However, the present invention is not limited thereto.

[0057] More specifically, the light guide plate 131e of this embodiment is similar to the aforementioned Figure 2C and Figure 2D In the embodiment, the upper surface of the glass light guide plate 131e has the optical properties of a diffuser after surface treatment, and the lower surface has the optical properties of a reflector after surface treatment. Figure 2A and Figure 2B The diffusion plate 132 and the reflection plate 133 may be omitted in the backlight module 100 e of this embodiment.

[0058] Through the above FIG. 2C to FIG. 2E The configuration can further simplify the manufacturing process of the backlight module 100c / 100d / 100e, thereby improving the production efficiency. At the same time, because the configuration of the diffusion plate and / or the reflection plate is omitted, the light uniformity effect and durability considerations that may be caused when connecting between components can also be improved at the same time.

[0059] For example, if the light guide plate and the diffuser / reflector are assembled by gluing, the optical performance of the backlight module may be affected by air bubbles during the gluing process. Furthermore, uneven pressure between components may be caused by uneven adhesive coating during gluing (more serious in the case of large-sized panels), which may also cause the problem of reduced optical performance. By omitting the configuration of the diffuser and reflector, the above problems can be improved at the same time.

[0060] Below FIG. 3A to FIG. 3DFurther explain the specific structural example of the above light guide plate, wherein FIG. 3A to FIG. 3D Schematic diagram of the configuration of the light guide plate of different embodiments of the present invention. Figure 3A The light guide plate 231 includes a support portion 2311, an optical microstructure 2312, and a reflective portion 2313, wherein the optical microstructure 2312 is formed on one side of the support portion 2311, and the reflective portion 2313 is formed on the other side of the support portion 2311. The surface of the light guide plate 231 on which the optical microstructure 2312 is formed is a first surface S1, which faces the display panel DP (i.e., faces the light enhancement plate 134); the surface of the light guide plate 231 on which the reflective portion 2313 is formed and located on the other side of the support portion 2311 is a second surface S2. In this embodiment, the first surface S1 is the light emitting surface of the light guide plate 231.

[0061] Specifically, the first surface S1 of the light guide plate 231 (i.e., the surface of the optical microstructure 2312) is frosted to have a rough structure RS, thereby reducing the glossiness of the first surface S1, so that the light passing through the first surface S1 is scattered and refracted, and thus has the optical characteristics of a diffuser. In some embodiments, the glossiness of the frosted first surface S1 may be, for example, less than 20; in some preferred embodiments, the glossiness of the first surface S1 may be less than 1, for example, between 0.85 and 0.9, but the present invention is not limited thereto.

[0062] More specifically, since the light guide plate 231 is made of glass, a rough structure RS can be formed on the first surface S1 by a frosting method such as sandblasting, grinding wheel, chemical etching, wet grinding, and texture printing. For example, in some embodiments, by soaking the first surface S1 of the light guide plate 231 with hydrofluoric acid, a rough structure RS can be formed on the surface / first surface S1 of the optical microstructure 2312 without damaging the optical microstructure 2312. Figure 3A The rough structure RS shown in the figure. In this way, the glossiness of the first surface S1 / light emitting surface can be reduced by roughening the surface of the optical microstructure 2312 while ensuring the light guiding performance of the light guide plate 231, thereby giving the first surface S1 the optical properties of scattering and refraction of the diffuser.

[0063] In some embodiments, the support portion 2311 of the light guide plate 231 and the optical microstructure 2312 may be integrally formed.

[0064] In some embodiments, in addition to the above-mentioned frosting method for forming the rough structure RS on the first surface S1 , the rough structure RS may also be formed by laser cutting and / or 3D printing, but the present invention is not limited thereto.

[0065] On the other hand, the second surface S2 of the light guide plate 231 is subjected to a coating process, so that a layer of reflective film is covered on the second surface S2 to form a reflective portion 2313. The reflective portion 2313 reflects light toward the first surface of the light guide plate 231, wherein the material of the reflective film can be a high-gloss metal material, such as aluminum or silver, but the present invention is not limited thereto. After the above-mentioned coating process, the reflective portion 2313 formed on the light guide plate 231 will have the optical properties of a reflective plate, and thus can replace the reflective plate 2313 formed on the light guide plate 231. Figure 2A and Figure 2B The reflecting plate 133 shown in FIG.

[0066] In some embodiments, the glossiness of the reflective portion 2313 may be greater than 95, for example.

[0067] The light guide plate 231 of this embodiment can be applied to Figure 2E In addition, if the light guide plate 231 of this embodiment performs the above-mentioned frosting treatment or other surface roughening treatment only on the first surface S1 to reduce the glossiness to the optical properties of a diffusion plate, it can be used for example Figure 2C If the light guide plate 231 of the present embodiment is only coated on the second surface S2 to improve the glossiness to have the optical properties of the reflective plate, it can be used as Figure 2D In the backlight module 100d.

[0068] Please refer to Figure 3B , the light guide plate 331 includes support parts 3311a and 3311b, an optical microstructure 3312 and a reflective part 3313, wherein the optical microstructure 3312 is formed between the support parts 3311a and 3311b, and the optical microstructure 3312 and the reflective part 3313 are formed on opposite sides of the support part 3311a. The surface of the support part 3311b away from the optical microstructure 3312 is the first surface S1, and the first surface S1 faces the display panel DP (i.e., faces the light enhancement plate 134); the surface of the light guide plate 331 on which the reflective part 3313 is formed and located on the other side of the support part 3311a is the second surface S2. In this embodiment, the first surface S1 is the light emitting surface of the light guide plate 331.

[0069] Specifically, this embodiment and the aforementioned Figure 3A The embodiment is similar, the main difference is that the optical microstructure 3312 of this embodiment is formed between the two layers of support parts 3311a and 3311b (that is, located in the glass material), so the rough structure RS of this embodiment is formed on the support part 3311b instead of being formed on the surface of the optical microstructure 3312.

[0070] In this embodiment, the first surface S1 of the light guide plate 331 (i.e., the upper surface of the support portion 3311b / the surface on the side away from the optical microstructure 3312) is frosted to have a rough structure RS, thereby reducing the glossiness of the first surface S1, so that the light passing through the first surface S1 is scattered and refracted, and thus has the optical characteristics of a diffuser. Similarly, in some embodiments, the glossiness of the frosted first surface S1 can be, for example, less than 20; in some preferred embodiments, the glossiness of the first surface S1 can be less than 1, for example, between 0.85 and 0.9, but the present invention is not limited thereto.

[0071] On the other hand, the formation and configuration of the reflector 3313 can refer to the above Figure 3A The description of the embodiments will not be repeated here.

[0072] From the perspective of the light guide plates 231 and 331 as a whole, the light guide plates 231 / 331 can be regarded as including a light incident surface, a first surface S1 and a second surface S2. The first surface S1, as the light emitting surface of the light guide plate 231 / 331, is substantially perpendicular to the light incident surface, and the second surface S2 is located on the other side opposite to the light emitting surface. The glossiness of the first surface S1 is less than 20, and the glossiness of the second surface S2 is greater than 80. In some embodiments, the glossiness of the first surface S1 is less than 1, and the glossiness of the second surface S2 is greater than 95. In some embodiments, the glossiness of the first surface S1 is between 0.85 and 0.9, and the glossiness of the second surface S2 is greater than 95.

[0073] Similar to the above-mentioned embodiment, the light guide plate 331 of this embodiment can be applied to Figure 2E In addition, if the light guide plate 331 of the present embodiment performs the above-mentioned frosting treatment or other surface roughening treatment only on the first surface S1 to reduce the glossiness to the optical properties of a diffusion plate, it can be used for example Figure 2C If the light guide plate 331 of the present embodiment is only coated on the second surface S2 to improve the glossiness to have the optical properties of the reflective plate, it can be used as Figure 2D In the backlight module 100d.

[0074] Please refer to Figure 3C The light guide plate 431 of this embodiment includes a supporting portion 4311, an optical microstructure 4312 and a reflecting portion 4313, wherein the cross-sectional structure of this embodiment is shown as similar to Figure 3A The structure of the embodiment is for illustration only, but the present invention is not limited thereto. The light guide plate 431 of the embodiment may also have the following structure: Figure 3B structure.

[0075] This embodiment and the aforementioned Figure 3A and Figure 3B The embodiments are substantially the same, with the main difference being that the reflective portion 4313 of this embodiment is not only formed on the second surface S2 , but also extends to at least a portion of the side surface of the light guide plate 431 .

[0076] Specifically, the side surfaces mentioned here are, for example, surfaces S3 to S5 of the light guide plate 431 other than the light incident surface S0 that are substantially perpendicular (or non-parallel) to the first surface S1 and / or the second surface S2. Figure 3C From a perspective, the side surfaces include, for example, a lower surface S3 , a left surface S4 , and an upper surface S5 of the light guide plate 431 .

[0077] In this embodiment, the reflective film on the reflective portion 4313 extends from the second surface S2 to at least one of the side surfaces S3 to S5. In some embodiments, the reflective film covers the second surface S2 and all the side surfaces S3 to S5. Through the configuration of the reflective portion 4313, not only the light toward the second surface S2 will be reflected back to the direction of the display panel, but also the light in other directions can be reflected by the reflective film on the side surfaces S3 to S5, so that the utilization rate of the light source can be further improved, and thus the brightness of the backlight module can be further improved.

[0078] The light guide plate 431 of this embodiment can be applied to Figure 2D In the backlight module 100d (the first surface S1 is not subjected to surface roughening treatment), or in the case of Figure 2E In the backlight module 100e (the first surface S1 is subjected to surface roughening treatment), the present invention is not limited thereto.

[0079] Please refer to Figure 3D The light guide plate 531 of this embodiment includes a supporting portion 5311, an optical microstructure 5312 and a reflecting portion 5313, wherein this embodiment is similar to the aforementioned Figure 3C Therefore, the relevant configuration description can refer to the description of the above embodiment, and will not be repeated here. Figure 3C The main difference between the embodiments is that the light guide plate 531 of the embodiment further includes reflective film structures 5314 arranged at intervals on its light incident surface S0.

[0080] Specifically, the reflective film structure 5314 on the light incident surface S0 is formed corresponding to the position of the light emitting element LEDs on the light emitting portion 110, wherein the reflective film structure 5314 is formed in the interval area between adjacent light emitting element LEDs to avoid blocking the light path of the light emitting element LEDs. By forming the reflective film structure 5314 arranged at intervals in the interval area between adjacent light emitting element LEDs, the light guide plate 531 can effectively improve the dark light area between the light emitting element LEDs, so that the light emission of the backlight module is more uniform.

[0081] The light guide plate 531 of this embodiment can also be applied to Figure 2D The backlight module 100d or Figure 2E In the backlight module 100e, the present invention is not limited thereto. Figure 3C and Figure 3D Although the embodiment depicts the light incident surface S0 as the right side surface of the light guide plate (i.e., the light emitting portion 110 is disposed on the right side of the light guide plate), the present invention is not limited thereto. In other embodiments, the light emitting portion 110 can be disposed on any one or more side surfaces according to design requirements, wherein the side surface on which the light emitting portion 110 is disposed is regarded as the light incident surface.

[0082] Below Figure 4A and Figure 4B The configuration example of the reflective film structure 5314 on the light incident surface S0 is further described. Figure 4A In this embodiment, the reflective film structure 5314a may be formed into a rectangular pattern and located in the spacing area between two adjacent light emitting elements. In other words, the width of the reflective film structure 5314a is selected based on the distance between adjacent light emitting elements, and the height of the reflective film structure 5314 is determined based on the thickness of the light guide plate.

[0083] Please refer to Figure 4B In this embodiment, the reflective film structure 5314b may be formed into a circular / elliptical pattern and is also located in the spacing area between two adjacent light-emitting elements. In other words, the diameter / long axis length of the reflective film structure 5314b is selected based on the distance between adjacent light-emitting elements.

[0084] In summary, the light guide plate and its backlight module proposed in the embodiment of the present invention perform special treatments on the two side surfaces of the light guide plate made of glass material respectively, so that the light emitting surface of the light guide plate can have low glossiness, and the other surface relative to the light emitting surface has high glossiness, thereby having the optical properties of both the diffuser plate and the reflector plate. Therefore, the manufacturing process of the backlight module using the light guide plate can be effectively simplified, thereby improving production efficiency. At the same time, because the configuration of the diffuser plate and the reflector plate is omitted, the light uniformity effect and durability considerations that may be caused when the components are connected can also be improved at the same time.

[0085] In addition, by extending the reflective portion to the side surface of the light guide plate, the light source utilization rate of the light emitting portion can be further improved, so that the brightness of the backlight module can be further improved. Furthermore, by arranging a reflective film structure corresponding to the interval area between the light emitting elements on the light incident surface, the dark area problem of the light emitting portion can be improved, so that the light emitting effect of the backlight module is more uniform.

[0086] Although the present invention has been disclosed using the above-mentioned embodiments, they are not intended to limit the present invention. Any person skilled in the art may make various changes and modifications to the above-mentioned embodiments without departing from the spirit and scope of the present invention, and the changes and modifications still fall within the technical scope protected by the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. A light guide plate, characterized in that: include: Light-entering surface; A first surface, substantially perpendicular to the light incident surface and serving as a light emitting surface of the light guide plate; A second surface, located on the other side of the first surface, wherein the glossiness of the second surface is greater than 95; as well as A plurality of side surfaces are not parallel to the first surface and are connected to the first surface and the second surface, wherein the glossiness of at least one of the plurality of side surfaces is greater than 95.

2. The light guide plate according to claim 1, wherein: A plurality of reflective film structures are formed on the light incident surface, and the plurality of reflective film structures are arranged at fixed intervals, wherein the glossiness of each of the reflective film structures is greater than 95.

3. A backlight module, characterized in that: include: The light guide plate as claimed in claim 1; as well as The light-emitting portion is arranged toward the light-incident surface and includes a plurality of light-emitting elements, wherein the plurality of light-emitting elements are arranged at fixed intervals.

4. The backlight module according to claim 3, wherein: A plurality of reflective film structures are formed on the light incident surface, and each of the reflective film structures is formed in a spacing region between adjacent light emitting elements.

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