Light guide plate device with random microstructure

Abstract

The light guide plate device comprises a light source device, a light guide plate and a first microstructure layer, the light source device is arranged on the side edge of the light guide plate, and the first microstructure layer is arranged on the light guide plate and located on the front face and / or the back face of the light guide plate. The first microstructure layer comprises a plurality of optical microstructures arranged on the surface of the light guide plate, the plurality of optical microstructures are randomly distributed, and the plurality of optical microstructures are tightly and fully paved on the front surface and / or the back surface of the light guide plate, and because the plurality of optical microstructures are arranged on the light guide plate, the functions of a traditional light guide film and the light guide plate are combined; according to the invention, the thickness and the number of layers of the device are greatly reduced without applying a laminating process, and through random arrangement of the plurality of optical microstructures, poor appearance caused by moire patterns is eliminated and the loss of transmittance is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of light-emitting devices, and in particular to a light guide plate device with a random microstructure. Background Art

[0002] With the development of science and technology, light guide plates have been widely used in lighting, display and other fields. However, the current surface of the light guide plate is designed with a dot matrix structure. Although this design can guide the propagation of light, the dot matrix structure is obvious and the problem of low light guide efficiency is more prominent. The conventional solution is to reduce the structural spacing. Reducing the diameter of the dots can improve the light guide efficiency and hide the dot matrix structure, but it will produce moiré. Moiré fringes are the visual result of interference between two lines or two objects at a constant angle and frequency. The method to eliminate moiré is to change the angle or frequency, but neither is suitable for light guide plates with microstructure sizes at the micron level. Therefore, how to solve the moiré problem caused by microstructures has become an important topic in the field of microstructure light guide plate design. Summary of the Invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention proposes a light guide plate device with a random microstructure.

[0004] In order to achieve the above technical effects, the present invention adopts the following scheme: A light guide plate device with a random microstructure includes a light source device, a light guide plate and a first microstructure layer, wherein the light source device is arranged on the side of the light guide plate, the first microstructure layer is arranged on the light guide plate and is located on the front and / or back of the light guide plate, and the first microstructure layer includes a plurality of optical microstructures arranged on the surface of the light guide plate, wherein the plurality of optical microstructures are randomly distributed, and the plurality of optical microstructures are tightly covered on the front and / or back of the light guide plate.

[0005] According to a preferred technical solution, an incident light introduction structure is provided between the light source device and the light guide plate, and the incident light introduction structure includes one of a second grating structure, a prism structure or a second microstructure layer.

[0006] According to a preferred technical solution, the light emitted by the light source device is incident from a side of the light guide plate.

[0007] In a preferred technical solution, the plurality of optical microstructures are a plurality of closely arranged first grating structures, the inclination angles of the plurality of first grating structures are set to be different, or the plurality of optical microstructures are a plurality of protrusions and / or pits.

[0008] According to a preferred technical solution, the protrusions and recesses are shaped like a cylindrical structure, a pyramidal structure, a spherical structure, an elliptical structure, a pyramidal structure, a pyramidal structure or a V-groove structure.

[0009] According to a preferred technical solution, the front and / or back surface of the light guide plate is further provided with a coating layer located on the surface of the first microstructure layer.

[0010] According to a preferred technical solution, the coating layer is a single-layer or multi-layer film structure.

[0011] According to a preferred technical solution, some of the optical microstructures are provided with diffusion particles.

[0012] According to a preferred technical solution, the luminous color of the light source device can be adjusted.

[0013] In a preferred technical solution, the method for randomly distributing optical microstructures on a light guide plate comprises the following steps: S1, preset width H, unit graphics and unit reference interval L; S2, randomly generate the vertex coordinates of several polygons with side length L; S3, determining whether the arrangement of the plurality of polygons covers the width, if so, proceeding to the next step, if not, returning to the previous step; S4, checking the coincident coordinates between the vertices of the polygons generated in step 2 and removing redundant coordinates; S5. Take the geometric center within the range of polygon vertex coordinate offset S; S6. Draw a unit figure at the geometric center coordinates; S7, assigning depth to the planar image according to a predetermined aspect ratio; S8. Export 3D drawings; S9. Processing a mold with several microstructures according to the 3D drawing; S10. Produce a light guide plate having a plurality of optical microstructures by using a mold.

[0014] A preferred technical solution is that another method for randomly distributing the optical microstructures (7) on the light guide plate comprises the following steps: S1, preset format H, unit graphic size range D, minimum graphic interval L, and upper limit X of the number of graphics within unit size S; S2. Generate unit size S based on size range D and minimum interval L; S3, detecting and deleting overlapping unit graphics; S4, randomly deleting redundant unit graphics according to the preset upper limit X of the number of graphics; S5, determining whether the unit size S generated by the block filling the width H, if so, proceed to the next step, if not, return to step S4; S6, outputting a planar image of size H; S7, assigning depth to the planar image according to a predetermined aspect ratio; S8. Export 3D drawings; S9. Processing a mold with several microstructures according to the 3D drawing; S10. Produce a light guide plate having a plurality of optical microstructures by using a mold.

[0015] Compared with the prior art, the beneficial effects are: The present invention has a simple structure and is easy to use. Since a number of optical microstructures are arranged on the light guide plate, the functions of the traditional light guide film and the light guide plate are combined, and no bonding process is required, which greatly reduces the thickness and number of layers of the device. In addition, the random arrangement of the several optical microstructures eliminates the apparent defects caused by moiré patterns and reduces the loss of transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the present invention with single-side light input; Figure 2 This is a schematic diagram of the structure of the double-side light input of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention with four-side light input; Figure 4 is a side cross-sectional schematic diagram of the light guide surface of the present invention; Figure 5 is a schematic diagram of the first grating structure in the present invention; Figure 6 Schematic diagram of the optical microstructure generated on the plane when the disturbance value α is 50% in the embodiment; Figure 7 Schematic diagram of the optical microstructure generated on the format when the disturbance value α=5% in the embodiment; Figure 8 Schematic diagram of an optical microstructure generated within a unit size when the size range D is set to a fixed value and no upper limit X on the number of patterns is set in the embodiment; Figure 9 In the embodiment, when the size range D is set to a constant value and the upper limit of the number of graphics is set to X, a schematic diagram of the optical microstructure generated within the unit size; Figure 10 Schematic diagram of an optical microstructure generated within a unit size when the size range D is set to a variable value and no upper limit X on the number of patterns is set in the embodiment; Figure 11 Schematic diagram of an optical microstructure generated within a unit size when the size range D is set to a variable value and the upper limit X of the number of patterns is set in the embodiment; Figure 12 This is a method step of randomly distributing optical microstructures on a light guide plate in the present invention; Figure 13 This is another method step of randomly distributing optical microstructures on a light guide plate in the present invention.

[0017] Figure numerals: 1. light guide plate; 2. light source device; 3. first microstructure layer; 4. incident light introduction structure; 5. coating layer; 6. first grating structure; 7. optical microstructure. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] A light guide plate device with a random microstructure includes a light source device 2, a light guide plate 1 and a first microstructure layer 3. The light source device 2 is used to provide light and is arranged on the side of the light guide plate 1. After the light enters the light guide plate 1 from the light incident side of the light guide plate 1, the light is transmitted to the front and / or back of the light guide plate 1, and then emitted from the front and / or back of the light guide plate 1. The first microstructure layer 3 is arranged on the light guide plate 1 and is located on the front and / or back of the light guide plate 1, and is integrally formed with the light guide plate. The first microstructure layer 3 includes a plurality of optical microstructures 7 provided on the surface of the light guide plate 1. The plurality of optical microstructures 7 are closely arranged on the front and / or back of the light guide plate 1. The arrangement of the plurality of optical microstructures 7 is a random arrangement of equal density within a block grid. The random arrangement means that the positions of the optical microstructures 7 are random.

[0020] The light source used by the light source device 2 can be a light-emitting device such as LED, OLED, AMOLED, miniLED, etc., which is used to provide light. The light is incident into the light guide plate 1 from the light incident side of the light guide plate 1. The material of the light guide plate 1 is any one of PET, BOPET, PC, PS, PMMA and PVC, or other transparent polymer materials, with a thickness of 1-50mm. When the light is transmitted to the front and / or back of the light guide plate 1, it is scattered by the multiple optical microstructures 7 located on the surface of the light guide plate 1 and then emitted, and different patterns are displayed according to the different arrangements of the multiple optical microstructures 7. Since the multiple optical microstructures 7 are directly arranged on the light guide plate 1, the functions of the traditional light guide film and the light guide plate 1 are combined, and there is no need to apply a bonding process, which greatly reduces the thickness and number of layers of the device. The random arrangement of the multiple optical microstructures 7 eliminates the apparent poor appearance and transmittance loss caused by the moiré pattern.

[0021] According to a preferred technical solution, an incident light introducing structure 4 is provided between the light source device 2 and the light guide plate 1, and the incident angle of the incident light is controlled by the incident light introducing structure 4. The incident light introducing structure 4 includes one of a second grating structure, a prism structure and a second microstructure layer.

[0022] Since the light from the light source device 2 is divergent light, part of it will be emitted directly from the edge of the glass if it is not blocked, affecting the overall uniformity of the light. Therefore, the incident angle of the light needs to be controlled.

[0023] In a preferred technical solution, the light emitted by the light source device 2 is incident from the side of the light guide plate 1 .

[0024] The light source device 2 is disposed on a side of the light guide plate 1, such that light emitted by the light source device 2 enters the light guide plate 1 from the side, is refracted within the light guide plate 1, and then exits from the front and / or back of the light guide plate 1, where the front and / or back refers to the front or back of the light guide plate 1. When the light source device 2 is disposed on a side of the light guide plate 1, it may be located on any one side, any multiple sides, or all sides of the light guide plate.

[0025] A preferred technical solution is that some of the optical microstructures 7 are some first grating structures 6, and the inclination angles of some first grating structures 6 are set to different levels, or some of the optical microstructures 7 are some pits or protrusions, and the aperture size of the pits and protrusions is 0.01um-100um.

[0026] The grating has visibility at special angles. By arranging and combining gratings at different tilt angles, the pattern can be bright and clear at different angles, and different clean and bright patterns can be seen at different angles. The pits and protrusions 7 destroy the flatness of the surface of the light guide plate 1, so that the light propagating inside the light guide plate 1 is scattered after passing through several optical microstructures 7. Due to the scattering characteristics of the pits and protrusions, the light is evenly scattered and can emit soft light on the side of the light guide plate 1, acting as an atmosphere light.

[0027] According to a preferred technical solution, the shapes of the pits and protrusions are cylindrical, pyramidal, spherical, elliptical, pyramidal, pyramidal or V-groove structures.

[0028] According to a preferred technical solution, the front and / or back surface of the light guide plate 1 is further provided with a coating layer 5 located on the surface of the first microstructure layer 3 .

[0029] The coating layer 5 covers the first microstructure layer 3 to protect the optical microstructure. The coating layer 5 prevents the optical microstructure from being exposed to the air and causing loss to affect its optical performance, thereby increasing its service life. The coating layer 5 can be coated on the outer surface or the inner surface of the first microstructure layer 3.

[0030] In a preferred technical solution, the coating layer 5 is a single-layer or multi-layer film structure.

[0031] Different film layers have different functions, such as anti-oxidation, heat insulation, anti-ultraviolet, anti-reflection, anti-reflection and other functions to improve the quality of the light guide plate 1, making the functions of the light guide plate 1 more diversified. The total thickness of the multi-layer coating is 0.001um-10um; the coating layer is processed to the front and / or back of the light guide plate by evaporation coating, magnetron sputtering coating, electroplating or one of other coating methods in the existing technology.

[0032] In a preferred technical solution, some of the optical microstructures 7 are provided with diffusion particles.

[0033] The diffusion particles are used to increase the light guiding performance. The diffusion particles can be made of organic materials or inorganic materials.

[0034] In a preferred technical solution, the luminous color of the light source device 2 can be adjusted.

[0035] In a preferred technical solution, the method for randomly distributing the optical microstructures 7 on the light guide plate comprises the following steps: S1, preset width H, unit graphics and unit reference interval L; S2, randomly generate the vertex coordinates of several polygons with side length L; S3, determining whether the arrangement of the plurality of polygons covers the width, if so, proceeding to the next step, if not, returning to the previous step; S4, checking the coincident coordinates between the vertices of the polygons generated in step 2 and removing redundant coordinates; S5. Take the geometric center within the range of polygon vertex coordinate offset S; S6. Draw a unit figure at the geometric center coordinates; S7, assigning depth to the planar image according to a predetermined aspect ratio; S8. Export 3D drawings; S9. Processing a mold with several microstructures according to the 3D drawing; S10. Produce a light guide plate having a plurality of optical microstructures by using a mold.

[0036] A specific embodiment of randomly distributed spherical optical microstructures 7 on the light guide plate: Based on any one of the random algorithms such as numerical algorithm, Sherwood algorithm, Las Vegas algorithm and Monte Carlo algorithm, a random point set is generated within the specified format. Under the premise of ensuring the aspect ratio, the point set is given a caliber and depth to draw the mold drawing. The specific steps are: use MATLAB or Python program software to establish a framework, first create a drawing area, define the filling range, that is, preset the format H and the unit reference interval L, H represents the area of ​​the drawing area, L represents the distance length of the interval, and the shape of the preset unit graphic is a circle, the unit graphic is the basic shape of the optical microstructure, and then according to the input L value, generate the vertex coordinates of several tightly arranged hexagons with L as the side length within the range of the format H, and judge whether the arrangement of the generated hexagons is correct. Cover the entire width H. If not, return to the previous step and regenerate the vertex coordinates of several hexagons with a side length of L. If so, continue to the next step, check the coincident coordinates in the vertex coordinates of the generated hexagons, and remove the duplicate redundant coordinates, import the random perturbation value α of the center of the circle (the perturbation value α determines the value range according to the required circle radius and the side length of the regular hexagon), and randomly generate the center of the circle with the vertex coordinate as the center and the perturbation value α as the radius at each hexagon vertex coordinate. That is, take the geometric center within the range of the hexagonal vertex coordinate offset S. After obtaining the position data of the center of the circle, draw a circle with a radius of R at the center position in the CAD software, check the drawing area, delete the circle that exceeds the drawing area, and give the circle a depth according to the predetermined depth-to-width ratio, and then export the 3D mold drawing.

[0037] Import the 3D drawing into the corresponding equipment, and use one of the processes including laser direct engraving, chemical etching, and photolithography to process a mold with several spherical microstructures. For example, using laser direct engraving, after importing the drawing into the etcher, fix the laser dot power according to the position of the circle, and engrave circles of the same depth on the rubber plate mold.

[0038] Then, any one of UV transfer technology, extrusion molding, hot pressing molding and printing technology is used to replicate the circular microstructure on the rubber plate mold on the light guide plate.

[0039] A preferred technical solution is that another method for randomly distributing the optical microstructures (7) on the light guide plate comprises the following steps: S1, preset format H, unit graphic size range D, minimum graphic interval L, and upper limit X of the number of graphics within unit size S; S2. Generate unit size S based on size range D and minimum interval L; S3, detecting and deleting overlapping unit graphics; S4, randomly deleting redundant unit graphics according to the preset upper limit X of the number of graphics; S5, determining whether the unit size S generated by the block filling the width H, if so, proceed to the next step, if not, return to step S4; S6, outputting a planar image of size H; S7, assigning depth to the planar image according to a predetermined aspect ratio; S8. Export 3D drawings; S9. Processing a mold with several microstructures according to the 3D drawing; S10. Produce a light guide plate having a plurality of optical microstructures by using a mold.

[0040] Another specific embodiment of randomly distributed spherical optical microstructures 7 on the light guide plate: Based on any one of the random algorithms such as numerical algorithm, Sherwood algorithm, Las Vegas algorithm and Monte Carlo algorithm, a random point set is generated within the specified format. Under the premise of ensuring the aspect ratio, the point set is given a caliber and depth to draw the mold drawing. The specific steps are: use MATLAB or Python program software to establish a framework, first create the drawing area, define the filling range, the size, spacing and density of the filling graphics, that is, preset the format H and the unit graphic size range D, the original size d of the unit graphic, the minimum graphic interval L, and the upper limit X of the number of graphics within the unit size S. H represents the area of ​​the drawing area, d represents the original size of the unit graphic, D represents the size change range of the unit graphic, L represents the distance length of the graphic interval, S represents the area size of the unit size, and X represents the unit size. The number of unit graphics in an inch is used to control the unit graphic density, and the shape of the unit graphics is preset to be a circle. The unit graphics are the basic shapes of the optical microstructures. Then, based on the input d, D, L, S, and X values, circles of different sizes generated based on the graphic size range D are drawn within the size S range with the minimum unit graphic spacing L as the basis. Specifically, the entire format H is divided into a number of unit sizes S. Unit graphics are drawn within the area of ​​each unit size with the minimum spacing L as the basis. The spacing between two adjacent unit graphics is random but not less than L. The size of each unit graphic is based on the original size d. Then, according to the size range D, it is proportionally increased or reduced to form unit graphics of different sizes. For example, if the original graphic is a size of 10, and the size range is set to 5-15, it will be proportionally reduced to 0.5-1.5 times.

[0041] Detect and delete overlapping and intersecting circles within the unit size S. Randomly delete circles exceeding the preset upper limit X of the number of graphics. Determine whether the unit size S generated by the blocks covers the entire format H. If not, return to the previous step and regenerate the unit size S. If so, continue to the next step, output the plane image of the format H, assign depth to the circles according to the predetermined depth-to-width ratio, and then export the 3D mold drawing.

[0042] The 3D drawing is imported into the corresponding equipment, and a mold with several spherical microstructures is processed using one of the processes including laser direct engraving, chemical etching, and photolithography. For example, using photolithography technology, after the drawing is imported into the photolithography machine, circles of different diameters and the same aspect ratio are engraved on the plastic plate according to the size and position of the circles.

[0043] Then, any one of UV transfer technology, extrusion molding, hot pressing molding and printing technology is used to replicate the circular microstructure on the rubber plate mold on the light guide plate.

[0044] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0046] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A light guide plate device having a random microstructure, characterized in that: The invention comprises a light source device (2), a light guide plate (1), and a first microstructure layer (3), wherein the light source device (2) is arranged on the side of the light guide plate (1), the first microstructure layer (3) is arranged on the light guide plate (1) and is located on the front and / or back of the light guide plate (1), and the first microstructure layer (3) comprises a plurality of optical microstructures (7) arranged on the surface of the light guide plate (1), the plurality of optical microstructures (7) are randomly distributed, and the plurality of optical microstructures (7) cover the front and / or back of the light guide plate (1).

2. The light guide plate device with random microstructure according to claim 1, wherein: An incident light introduction structure (4) is provided between the light source device (2) and the light guide plate (1), and the incident light introduction structure (4) comprises one of a second grating structure, a prism structure or a second microstructure layer.

3. The light guide plate device with random microstructure according to claim 1, wherein: The light emitted by the light source device (2) is incident from the side of the light guide plate (1).

4. The light guide plate device with random microstructure according to claim 1, wherein: The plurality of optical microstructures (7) are a plurality of closely arranged first grating structures (6), the tilt angles of the plurality of first grating structures (6) are set to be different, or the plurality of optical microstructures (7) are a plurality of protrusions and / or pits.

5. The light guide plate device with random microstructure according to claim 4, wherein: The shapes of the protrusions and the pits are cylindrical, pyramidal, spherical, elliptical, pyramidal, pyramidal or V-groove structures.

6. The light guide plate device with random microstructure according to claim 1, wherein: The front and / or back surface of the light guide plate (1) is further provided with a coating layer (5) located on the surface of the first microstructure layer (3).

7. The light guide plate device with random microstructure according to claim 6, wherein: The coating layer (5) is a single-layer or multi-layer film structure.

8. The light guide plate device with random microstructure according to claim 1, wherein: Some of the optical microstructures (7) are provided with diffusion particles.

9. The light guide plate device with random microstructure according to claim 1, wherein: The method for randomly distributing optical microstructures (7) on a light guide plate comprises the following steps: S1, preset width H, unit graphics and unit reference interval L; S2, randomly generate the vertex coordinates of several polygons with side length L; S3, determining whether the arrangement of the plurality of polygons covers the width, if so, proceeding to the next step, if not, returning to the previous step; S4, checking the coincident coordinates between the vertices of the polygons generated in step 2 and removing redundant coordinates; S5. Take the geometric center within the range of polygon vertex coordinate offset S; S6. Draw a unit figure at the geometric center coordinates; S7, giving depth to the planar image according to a predetermined aspect ratio; S8. Export 3D drawings; S9. Processing a mold with several microstructures according to the 3D drawing; S10. Produce a light guide plate having a plurality of optical microstructures by using a mold.

10. The light guide plate device with random microstructure according to claim 1, wherein: The method for randomly distributing optical microstructures (7) on a light guide plate comprises the following steps: S1, preset format H, unit graphic size range D, minimum graphic interval L, and upper limit X of the number of graphics within unit size S; S2. Generate unit size S based on size range D and minimum interval L; S3, detecting and deleting overlapping unit graphics; S4, randomly deleting redundant unit graphics according to the preset upper limit X of the number of graphics; S5, determining whether the unit size S generated by the block division fills the width H, if so, proceeding to the next step, if not, returning to step S4; S6, outputting a planar image of size H; S7, assigning depth to the planar image according to a predetermined aspect ratio; S8. Export 3D drawings; S9. Processing a mold with several microstructures according to the 3D drawing; S10. Produce a light guide plate having a plurality of optical microstructures by using a mold.

Images