Lateral light guide plate, backlight structure and electronic display

Abstract

The invention provides a side-entry light guide plate, a backlight structure and an electronic display, the light guide plate comprises a light guide plate body, the light guide plate body comprises a face part, a bottom part opposite to the face part and a side part located between the face part and the bottom part; the side part is used for receiving light provided by the light source assembly, the face part is used for radiating the light, the bottom is provided with first net points, the side part is provided with second net points, and the first net points and the second net points are used for changing the path of the light in the light guide plate body so that the light can reach the face part through the diffuse reflection effect. And the second lattice points are arranged in the light guide plate body. According to the light guide plate, the incident angle of the light source is actively regulated and controlled through the diffuse reflection effect of the second lattice points on the side part, so that upper-layer light originally transmitted along a fixed path is scattered for multiple times on the side part, and Hotspot period bright and dark fringes formed by light overlapping interference are effectively broken.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic display light guide, and particularly to a side-in type light guide plate, a backlight structure and an electronic display. Background Art

[0002] With the development trend of the thinning of display devices, the side-in type backlight module has been widely used in fields such as notebook computers (NB), tablet computers (TPC), monitors (MNT) and televisions (TV) due to its advantages such as compact structure and low energy consumption. The traditional side-in type backlight structure is composed of a back plate, a rubber frame, a light bar (including LED particles), a light guide plate (LGP), a brightness enhancement film, a diffusion film and a reflection film, etc. Among them, the light bar is arranged on the side of the light guide plate (such as Figure 6 ), and the light emitted by the LED enters through the side of the light guide plate.

[0003] In practical applications, such as Figure 7 , a single LED is limited by the light emitting angle (usually 120°), and the light rays of adjacent light sources are prone to overlapping interference during transmission, resulting in a periodic bright and dark "Hotspot" phenomenon on the display screen, such as Figure 8 and Figure 9 .

[0004] To solve this problem, the prior art mostly adjusts the light propagation path by setting microstructures (such as dot patterns, V-grooves or prism structures) at the bottom of the light guide plate. Specifically, such as Figure 4 , currently, the light guide plate mainly makes dot patterns W at the bottom of the LGP through processes such as injection molding, hot pressing, printing, and laser. Such as Figure 5 , taking hot pressing as an example, one side of the processed light guide plate will be covered with dot patterns W, and the density of the dot patterns near the light source entrance can be adjusted to optimize the Hotspot to a certain extent.

[0005] However, the microstructures on the bottom surface of the light guide plate can only indirectly adjust the bottom layer light through reflection, while the upper layer light incident from the side still propagates along the original path (such as Figure 4 ), resulting in the inability to completely eliminate the light intensity superposition at the junction of LED particles, and it is difficult to eliminate the Hotspot phenomenon. Summary of the Invention

[0006] The purpose of the present invention is to provide a side-in type light guide plate, a backlight structure and an electronic display that solve the Hotspot problem from the root of the light source propagation path to solve the above technical problems.

[0007] To achieve the above object, the present invention provides a side-entry light guide plate, which includes a light guide plate body. The light guide plate body includes a face, a bottom opposite to the face, and a side portion located between the face and the bottom; the side portion is used to receive the light provided by the light source assembly, the face is used to radiate the light, the bottom is provided with first light points, and the side portion is provided with second light points. The first light points and the second light points are used to change the path of the light in the light guide plate body, so that the light reaches the face with a diffuse reflection effect, and the second light points are arranged inside the light guide plate body.

[0008] Preferably, the second light points are distributed in any area between the face and the bottom.

[0009] Preferably, in the light guide plate body, the second light points are respectively arranged in different thickness layers between the face and the bottom.

[0010] Preferably, the second light points are formed in the light guide plate body based on the laser internal engraving process.

[0011] Preferably, the first light points are made by any one of injection molding, hot pressing, printing, and laser processes.

[0012] Preferably, several of the second light points are arranged in the light guide plate body to form any one or more of circular, elliptical, polygonal, or irregular geometric structures.

[0013] The present invention also provides a side-entry backlight structure, which includes a light source assembly and the side-entry light guide plate as described above. The light source assembly is arranged on the side portion of the light guide plate body.

[0014] Preferably, the light source assembly includes a lamp bar substrate and an LED light source arranged on the lamp bar substrate.

[0015] The present invention also provides an electronic display, which includes a liquid crystal module and a backlight module. The backlight module includes the side-entry light guide plate and the light source assembly as described above. The light source assembly is arranged on the side portion of the light guide plate body.

[0016] Compared with the prior art, the side-entry light guide plate provided by the above technical solution not only has first light points arranged on the bottom of the light guide plate, but also has second light points arranged on the side portion of the light guide plate. Through the diffuse reflection of the second light points on the side portion, the active regulation of the incident angle of the light source is realized, so that the upper-layer light originally transmitted along a fixed path is scattered multiple times on the side portion, effectively breaking the Hotspot periodic bright and dark stripes formed by the overlapping interference of the light; in addition, the arrangement of the side portion light points reduces the edge light leakage phenomenon caused by the light directly penetrating the light guide plate. Combining the secondary modulation of the reflected light by the first light points on the bottom, the overall light efficiency can be further optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 5 is a side view of the light guide plate according to an embodiment of the present invention.

[0018] Figure 2 FIG. 9 is an effect diagram of the light guide plate processing light rays according to an embodiment of the present invention.

[0019] Figure 3 FIG. 13 is a schematic plan view of the planar structure of the electronic display according to an embodiment of the present invention.

[0020] Figure 4 FIG. 17 is an effect diagram of the light guide plate processing light rays in the prior art.

[0021] Figure 5 FIG. 21 is a plan view of the bottom of the light guide plate in the prior art.

[0022] Figure 6 FIG. 25 is a structural diagram of the light source arrangement of the light guide plate in the prior art.

[0023] Figure 7 FIG. 29 is Figure 6 the light emission effect diagram of a single LED particle in FIG.

[0024] Figure 8 FIG. 35 is Figure 6 the interference effect diagram of all LED particles emitting light in FIG.

[0025] Figure 9 FIG. 41 is for Figure 6 the display effect diagram of the display assembled with the light guide plate in FIG. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to explain in detail the technical content, structural features, achieved objectives and effects of the present invention, the following is a detailed description in conjunction with the embodiments and with reference to the accompanying drawings.

[0027] This embodiment discloses a side-entry light guide plate, which is used for various electronic display products such as notebook computers, tablet computers, displays, and televisions.

[0028] As shown in Figure 1 and Figure 2 , the light guide plate includes a light guide plate body 1, and the light guide plate body 1 includes a face 10, a bottom 11 opposite to the face 10, and a side 12 located between the face 10 and the bottom 11.

[0029] The side portion 12 is for receiving the light provided by the light source assembly 2, and the front portion 10 is for radiating the light. The bottom portion 11 is provided with a first dot pattern 13, and the side portion 12 is provided with a second dot pattern 14. The first dot pattern 13 and the second dot pattern 14 are for changing the path of the light within the light guide plate body 1 so that the light reaches the front portion 10 with a diffuse reflection effect. And the second dot pattern 14 is provided inside the light guide plate body 1.

[0030] This embodiment is based on the physical principle of light propagation in a medium and the diffuse reflection effect, aiming to solve the problems of poor light uniformity and difficulty in eliminating the Hotspot phenomenon in existing side-entry light guide plates.

[0031] In this regard, in addition to providing the first dot pattern 13 on the bottom portion 11 of the light guide plate body 1, a second dot pattern 14 is also provided inside the side portion 12 of the light guide plate body 1. It should be particularly noted here that the first dot pattern 13 in this embodiment can cover the entire surface of the bottom portion 11, and the second dot pattern 14 is only provided on the side portion 12 close to the light source assembly 2.

[0032] The second dot pattern 14 is a micro-structure located on the side portion 12 of the light guide plate body 1 and is located inside the light guide plate body 1 rather than on the surface. When the light is incident into the light guide plate body 1 through the side portion 12, especially the light rays propagating in the upper layer region of the light guide plate, they will directly encounter and be intercepted by the second dot pattern 14. Through the diffuse reflection effect, the second dot pattern 14 causes these light rays to scatter and re-direct multiple times inside the side portion 12, thus effectively breaking the limitation of the light rays propagating along a fixed path in the upper layer region of the light guide plate body 1 and solving the problem of difficult control of the upper layer light rays in the prior art.

[0033] Specifically, the first dot pattern 13 and the second dot pattern 14 act together to form a collaborative light path changing system. The first dot pattern 13 is mainly responsible for modulating the light rays reflected from the bottom portion 11 of the light guide plate, while the second dot pattern 14 focuses on directly scattering and controlling the light rays incident on the side portion 12, especially the upper layer light rays. This configuration of dual dot patterns enables more comprehensive and refined control of the propagation path of the light inside the light guide plate body 1, ensuring that the light finally radiates from the front portion 10 with a highly uniform diffuse reflection effect.

[0034] Through this structural improvement, the present invention significantly improves the light uniformity and effectively suppresses the Hotspot phenomenon, thereby providing a higher quality display effect. Or, on the premise of ensuring the picture effect, the A / P ratio (that is, the distance from the light emitting surface of the light source in the light source assembly 2 to the visible area of the display / the center line distance between each light source) can be further reduced, providing an optical optimization solution for the subsequent narrow bezel design of the display.

[0035] In addition, the arrangement of the dots at the side part 12 reduces the edge light leakage phenomenon caused by the direct penetration of light through the light guide plate. Combined with the secondary modulation of the reflected light by the first dots 13 at the bottom part 11, the overall light efficiency can be further optimized.

[0036] On the other hand, the second dots 14 are distributed in any area between the face part 10 and the bottom part 11.

[0037] In this embodiment, by distributing the second dots 14 in any area between the face part 10 and the bottom part 11, the second dots 14 can directly act on the light rays at different heights inside the light guide plate body 1. When the light enters from the side part 12, it will propagate by total internal reflection inside the light guide plate body 1. By arranging the second dots 14 at any height between the face part 10 and the bottom part 11, these dots can intercept and scatter the light rays on different propagation paths, especially those light rays that are far from the bottom part 11 and cannot be effectively regulated by the traditional dots at the bottom part 11.

[0038] This distribution method ensures that the light rays incident from the side part 12 can be fully scattered and mixed in the entire thickness direction, thereby more effectively eliminating the Hotspot phenomenon and improving the uniformity of the light emitted from the face part 10. Moreover, this flexible distribution of the second dots 14 makes the energy distribution of the light rays inside the light guide plate body 1 more balanced, thus overcoming the problem of uneven light distribution in the thickness direction in the prior art.

[0039] In addition, in terms of expandability and adaptability, the distribution of the second dots 14 in any area between the face part 10 and the bottom part 11 provides greater flexibility for the design of the light guide plate. In this way, according to different display sizes, thicknesses, and specific requirements for light uniformity, the distribution position and density of the second dots 14 can be precisely adjusted to achieve a customized light regulation scheme. This adaptability enables the present invention to better meet various complex and diverse application requirements, further enhancing the market competitiveness of the product.

[0040] Furthermore, the specific position and distribution density of the second dots 14 in the thickness direction can be precisely optimized according to the simulation results. For example, the propagation path and energy distribution of the light rays inside the light guide plate body 1 can be analyzed through optical simulation software to determine the distribution scheme of the second dots 14 that can most effectively eliminate the Hotspot phenomenon and improve the uniformity.

[0041] On the other hand, inside the light guide plate body 1, the second dots 14 are respectively arranged in different thickness layers between the face part 10 and the bottom part 11.

[0042] In this embodiment, by arranging the second dots 14 in layers in the thickness direction of the light guide plate body 1, fine regulation of the light rays at different vertical heights can be achieved.

[0043] When light is incident on the light guide plate body 1 from the side 12, the light will propagate along different thickness layers. By respectively arranging the second dot patterns 14 in these different thickness layers, each layer of dot patterns can specifically act on the light in that layer, causing it to undergo diffuse reflection.

[0044] For example, the second dot patterns 14 arranged near the face 10 can effectively scatter the upper-layer light that would otherwise directly penetrate and cause the Hotspot phenomenon. The second dot patterns 14 arranged in the middle or near the bottom 11 can further optimize the mixing and uniformity of the light. The second dot patterns 14 arranged in this layered manner work together, enabling the light to be fully scattered and redistributed in the thickness direction of the entire light guide plate body 1, thereby ensuring that the light radiates from the face 10 with higher uniformity, completely eliminating the Hotspot phenomenon, and significantly improving the quality of the display screen.

[0045] Specifically, the internal space can be divided into two layers, three layers, or more layers according to the thickness of the light guide plate body 1, and different densities or shapes of the second dot patterns 14 can be arranged in each layer. The spacing between layers can also be optimized according to the light propagation characteristics and the required uniformity.

[0046] On the other hand, the second dot patterns 14 are formed in the light guide plate body 1 based on the laser internal engraving process. The first dot patterns 13 are fabricated by any one of injection molding, hot pressing, printing, and laser processes.

[0047] The working principle of the laser internal engraving process is to use a laser beam with a high energy density. By focusing at a specific depth inside the transparent material, tiny, permanent damage or modified areas are generated at the focal point, thereby forming a three-dimensional microstructure with scattering function. When the laser beam penetrates the surface of the light guide plate body 1, its energy density is not sufficient to damage the surface. Only when it is precisely focused on the internal preset position will the second dot patterns 14 be formed at that point. These tiny damage points or modified areas formed inside have different optical properties from the surrounding base material. When light propagates to these areas, scattering and diffuse reflection will occur, thereby changing the light path.

[0048] In this embodiment, by adopting the laser internal engraving process to form the second dot patterns 14, precise control over the position, shape, size, and density of the second dot patterns 14 inside the light guide plate body 1 can be achieved. The laser internal engraving technology does not require processing on the surface of the light guide plate, avoiding the influence on the surface optical performance. At the same time, it can flexibly form scattering points at any depth and area inside the side 12 of the light guide plate body 1, and even can form multiple layers or gradient-distributed second dot patterns 14. This precise internal microstructure manufacturing ability enables the second dot patterns 14 to interact more effectively with the incident light, realizing fine control of the light path, thereby significantly improving the light emission uniformity and effectively eliminating the Hotspot phenomenon.

[0049] Laser internal engraving can use femtosecond lasers, picosecond lasers or nanosecond lasers. Different types of lasers vary in processing accuracy, efficiency and their impact on materials, and can be selected according to specific requirements. Parameters such as the energy of the laser, pulse frequency, scanning speed, and the depth and shape of the focus point can all be precisely adjusted to control the size and scattering characteristics of the second dot 14.

[0050] It should be noted that nano-scale scattering particles (such as titanium dioxide, alumina, etc.) can also be doped into the material of the light guide plate body 1 to achieve internal scattering by controlling the doping concentration and particle size. Microreplication technology can also be used to pre-design and form microstructures inside the light guide plate body 1.

[0051] On the other hand, a single second dot is in the shape of a round dot, and several of these second dots are arranged in the light guide plate body to form any one or more of the structures such as a circle, an ellipse, a polygon or an irregular geometric body.

[0052] For circular or elliptical structures: They can provide relatively uniform scattering and are suitable for areas that require extensive light diffusion. The elliptical structure can be optimized according to the angle of the incident light to achieve more directional scattering, thereby guiding the light more effectively.

[0053] For polygon structures: Such as squares, triangles, hexagons, etc., their edges and corners can produce more complex diffraction and reflection effects, which are suitable for scenarios that require scattering at specific angles or directions and help to break the light propagation law.

[0054] For irregular geometric structures: They can provide highly random scattering, effectively break the periodic propagation of light, and have unique advantages in eliminating Hotspot and improving light uniformity, especially in the light overlapping area.

[0055] In this embodiment, by strategically arranging several of these different-shaped structures inside the light guide plate body, such as forming an array, a gradient distribution or a specific pattern, the scattering direction and intensity of the light can be precisely controlled. This combination and arrangement method enables the second dots to more effectively change the path of the light in the light guide plate body, making it reach the surface by diffuse reflection effect, thereby achieving better overall light emission uniformity and effectively suppressing the Hotspot phenomenon.

[0056] In another preferred embodiment of the present invention, a side-in type backlight structure is also disclosed, which includes a light source assembly 2 and the side-in type light guide plate disclosed in the above embodiment, and the light source assembly 2 is arranged on the side part 12 of the light guide plate body 1.

[0057] Specifically, the light source assembly 2 includes a lamp bar substrate 20 and an LED light source 21 arranged on the lamp bar substrate 20.

[0058] In another preferred embodiment of the present invention, an electronic display is also disclosed, such as Figure 1 and Figure 3 , which includes a liquid crystal module 30 and a backlight module. The backlight module includes a side-in type light guide plate and a light source assembly 2 disclosed in the above embodiment, and the light source assembly 2 is disposed on the side portion 12 of the light guide plate body 1.

[0059] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A side-entry light guide plate, characterized in that, It includes a light guide plate body, which includes a face, a bottom opposite to the face, and a side portion located between the face and the bottom; the side portion is used to receive the light provided by the light source assembly, the face is used to radiate the light, the bottom is provided with first light points, and the side portion is provided with second light points. The first light points and the second light points are used to change the path of the light in the light guide plate body so that the light reaches the face with a diffuse reflection effect, and the second light points are arranged inside the light guide plate body.

2. The side-entry light guide plate according to claim 1, characterized in that, The second light points are distributed in any area between the face and the bottom.

3. The side-in type light guide plate according to claim 1, wherein Inside the light guide plate body, the second light points are respectively arranged in different thickness layers between the face and the bottom.

4. The side-entry light guide plate according to claim 1, wherein, The second light points are formed inside the light guide plate body based on the laser internal engraving process.

5. The side-entry light guide plate according to claim 1, wherein The first light points are made by any one of injection molding, hot pressing, printing, and laser processes.

6. The side-in type light guide plate according to claim 1, wherein, A plurality of the second light points are arranged in the light guide plate body to form any one or more structural bodies of a circle, an ellipse, a polygon, or an irregular geometric body.

7. A side-entry backlight structure, characterized in that, It includes a light source assembly and the side-in type light guide plate according to any one of claims 1 to 6, and the light source assembly is arranged on the side portion of the light guide plate body.

8. The side-entry backlight structure according to claim 7, characterized in that, The light source assembly includes a light bar substrate and an LED light source arranged on the light bar substrate.

9. An electronic display, characterized in that, It includes a liquid crystal module and a backlight module, and the backlight module includes the side-in type light guide plate according to any one of claims 1 to 6 and a light source assembly, and the light source assembly is arranged on the side portion of the light guide plate body.

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