Light guide plate for mini-led backlight and dot processing process thereof

Abstract

The application relates to the field of light guide plate production and processing, in particular to a light guide plate for a Mini LED backlight source, which has the following specific scheme: the light guide plate can be various optical film materials, a plurality of dot grooves are arranged on a light splitting surface, the dot grooves are recessed towards the inside of the light guide plate body, the dot grooves correspond to and cover LED lamp beads, the gap between the light guide plate and the LED lamp beads is shortened, the light emitted by the LED lamp beads can be refracted in multiple directions through the dot grooves and enter the inside of the light guide plate body, the thickness of the backlight source is reduced, meanwhile, the recessed part is arranged on the groove wall of the dot groove and is recessed towards the end away from the dot groove, at this time, the groove wall of the dot groove forms a rough surface, the light is refracted and conducted to the blind area between the adjacent two dot grooves through the recessed part, so that the light in the blind area is increased, and the light in the blind area is reflected to a diffusion surface through reflection, so that the problem of uneven brightness caused by the gap between the LED lamp beads and the light guide plate is solved.

Description

Technical Field

[0001] This invention relates to the field of light guide plate manufacturing and processing, and in particular to a light guide plate for MiniLED backlight and its dot processing technology. Background Technology

[0002] With the rapid development of MiniLED display technology, MiniLED display products have begun to be applied to ultra-large high-definition displays, such as monitoring and command, high-definition broadcasting, high-end cinemas, medical diagnostics, advertising displays, conference and exhibitions, office displays, virtual reality, and other commercial fields. Mini LED backlights refer to backlights that use 100um-level LED chips, with a size between small-pitch LEDs and Micro LEDs, and a pixel pitch of less than 2.5 millimeters between adjacent LED chips.

[0003] In related technologies, MiniLED backlights include multiple beam-splitting films and LED light boards. The multiple beam-splitting films are directly stacked together and located on the LED light board, thus achieving beam-splitting and diffusion of the LED light board, so that the light emitted by multiple LED beads forms a surface light source.

[0004] Regarding the aforementioned technologies, the inventors believe that due to the large pitch angle between LED beads and the certain gap between the LED beads and multiple beam splitters, blind spots are generated in the gaps between the LED beads on the LED light board. These blind spots affect the overall brightness of the miniLED backlight, resulting in uneven brightness when the backlight emits light. Summary of the Invention

[0005] To address the problem of uneven brightness caused by the gap between the beam splitter and the lamp board, this application provides a light guide plate for a MiniLED backlight and its dot matrix processing technology.

[0006] In a first aspect, this application provides a light guide plate for a MiniLED backlight, employing the following technical solution:

[0007] A light guide plate for a MiniLED backlight includes a light guide plate body. The two opposite surfaces of the light guide plate body are a diffusion surface and a beam-splitting surface, respectively. The beam-splitting surface is provided with a plurality of dot grooves. Each of the plurality of dot grooves corresponds to an LED and covers the LED. The plurality of dot grooves are recessed toward the interior of the light guide plate body. The groove walls of the plurality of dot grooves are provided with a plurality of recesses for refracting light. The plurality of recesses are all arranged circumferentially along the groove walls of the dot grooves. The recesses are recessed toward the end away from the dot groove.

[0008] Through the above technical solution, multiple dot grooves are set on the beam-splitting surface. These grooves are recessed into the light guide plate body, corresponding to and covering the LED beads. This allows for quick positioning of the LED beads and the light guide plate, facilitating the assembly of the LED light board and the light guide plate, and optimizing the backlight assembly process. This shortens the gap between the light guide plate and the LED beads, allowing the light emitted by the LED beads to be refracted in multiple directions through the dot grooves into the light guide plate body, reducing the thickness of the backlight. Simultaneously, the recessed portion is located on the groove wall of the dot groove and is recessed towards the end furthest from the groove. This creates an uneven surface on the groove wall, allowing light to be refracted and transmitted to the blind area between two adjacent dot grooves, increasing the amount of light in the blind area. This light in the blind area is then reflected to the diffusion surface, further splitting the light and solving the problem of uneven brightness caused by the gap between the LED beads and the light guide plate.

[0009] Preferably, the plurality of recesses are arranged sequentially along the width direction of the dot groove wall from the opening of the dot groove to the bottom of the dot groove, and the depth of the plurality of recesses gradually increases along the height direction of the dot groove wall from the bottom of the dot groove to the opening of the dot groove.

[0010] Through the above technical solution, multiple recesses are arranged sequentially along the wall of the dot groove. The depth of the multiple recesses gradually increases from the bottom of the dot groove to the opening of the dot groove along the height direction of the dot groove, so as to change the conduction direction of the LED beads. This refracts some of the light near the beam splitting surface and guides it to the gap between two adjacent dot grooves, so that the light is reasonably distributed when it enters the light guide plate body through the dot groove refraction, thereby improving the light energy utilization rate.

[0011] Preferably, the depths of the plurality of recesses are arranged in a Bezier curve pattern.

[0012] Through the above technical solution, during the refraction of light emitted by LED beads through the recessed part, the depth of the recessed part changes with a Bezier curve, which can precisely control the depth of each recessed part, thereby optimizing the structure of the dot groove, making the distribution of light refracted into the light guide plate body more reasonable, and reducing light energy loss.

[0013] Preferably, the recessed portion includes a first recessed surface and a second recessed surface. The first recessed surface and the second recessed surface of the plurality of recessed portions are arranged sequentially along the wall of the dot groove from the opening of the dot groove to the bottom of the dot groove. The two opposite sides of the first recessed surface and the second recessed surface coincide and connect to form a bottom corner. The angle of the bottom corner is set in the range of 100°-110°.

[0014] With the above technical solution, the angle of the bottom corner is set within 80°-140°, which is conducive to the light being refracted by the first concave surface and then tending to be transmitted to the beam splitting surface, so that more light is transmitted to the gap between two adjacent dot grooves, thereby improving the refraction and diffusion effect of light and optimizing the beam splitting effect.

[0015] Preferably, the width of the first recessed surface is greater than the width of the second recessed surface.

[0016] Through the above technical solution, the width of the first concave surface is greater than the width of the second concave surface, which increases the light-receiving area of ​​the first concave surface, enabling the first concave surface to refract more light, causing more light to be refracted and tend to be transmitted to the beam splitter, and allowing more light to be transmitted to the blind area with less light.

[0017] Preferably, the dot groove is a conical groove, and the groove wall slopes from the groove opening to the bottom towards the end closer to the interior of the light guide plate body.

[0018] Through the above technical solution, the dot groove is set as a conical groove, and the groove wall is inclined from the groove opening to the bottom towards the end closer to the interior of the light guide plate body, which can refract the light emitted by the LED beads in multiple directions, thereby improving the light energy utilization rate.

[0019] Preferably, the first recessed surface is an arc-shaped surface, and the first recessed surface transitions from the side away from the groove wall of the dot pattern to the side that connects with the second recessed surface with a circular arc.

[0020] Through the above technical solution, the first concave surface is an arc-shaped surface, which can finely adjust the refraction direction of the light emitted by the LED lamp bead, increase the diffusion range of the light, and optimize the light transmission effect.

[0021] Preferably, the wall of the dot groove transitions from the groove opening to the bottom of the dot groove in an arc shape, and gradually protrudes towards the interior of the light guide plate body.

[0022] Through the above technical solution, the groove wall of the dot groove transitions from the groove opening to the bottom of the groove in an arc, so as to make a slight adjustment to the refraction direction of the first and second recessed surfaces in the recessed part, thereby increasing the diffusion range of light and allowing more light to be refracted into the light guide plate body.

[0023] Preferably, the diffusion surface is provided with spark patterns or sunburst patterns.

[0024] Through the above technical solution, the setting of spark patterns can increase the roughness of the diffusion surface, making the diffusion surface uneven, thereby improving the softness and uniformity of light emission.

[0025] Secondly, this application discloses a dot matrix process for a light guide plate used in MiniLED backlights.

[0026] A dot matrix process for a light guide plate used in a MiniLED backlight includes the following steps:

[0027] S1. The dot depressions are formed on the mold core;

[0028] S2. Cast the mold core to form a steel plate with raised dots;

[0029] S3. Transfer the steel plate with raised dots to the diffusion surface (2) of the light guide plate to form a dot groove (4).

[0030] The above technical solution involves forming dot depressions in the mold core and then casting a steel plate with dot protrusions. The steel plate is then transferred to the diffusion surface of the light guide plate to form the required dot grooves. This allows the dots to have an inwardly recessed structure, improving the production quality of the light guide plate and reducing production costs.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. Multiple dot grooves are set on the beam splitting surface. The multiple dot grooves are recessed into the light guide plate body. The groove wall of the dot groove is provided with multiple recessed parts, so that the light is refracted and transmitted to the blind area between two adjacent dot grooves through the recessed parts, thereby increasing the light in the blind area. At this time, the light in the blind area is reflected to the diffusion surface, so as to solve the problem of uneven brightness caused by the gap between the LED beads and the light guide plate.

[0033] 2. The angle of the bottom corner is set within 80°-140°, which is conducive to the light rays being refracted by the first concave surface and then tending to be transmitted to the beam splitting surface, thus improving the refraction and diffusion effect of the light.

[0034] 3. The first concave surface is an arc-shaped surface, which can finely adjust the refraction direction of the light emitted by the LED beads, increase the diffusion range of the light, and optimize the light transmission effect. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural schematic diagram of a light guide plate for a MiniLED backlight according to this application;

[0036] Figure 2 This is another three-dimensional structural schematic diagram of a light guide plate for a MiniLED backlight according to this application;

[0037] Figure 3 This is a schematic diagram of the optical path of a light guide plate for a MiniLED backlight according to Embodiment 1 of this application;

[0038] Figure 4This is a frontal projection view of the dot groove of Embodiment 1 of a light guide plate for a MiniLED backlight according to this application;

[0039] Figure 5 This is a schematic diagram of the linear change of the recessed portion in Embodiment 1 of a light guide plate for a MiniLED backlight according to this application;

[0040] Figure 6 This is a Bezier curve variation diagram of Embodiment 1 of a light guide plate for a MiniLED backlight according to this application;

[0041] Figure 7 This is a schematic diagram of the optical path of a light guide plate for a MiniLED backlight according to Embodiment 2 of this application;

[0042] Figure 8 This is a frontal projection view of the dot groove of Embodiment 2 of a light guide plate for a MiniLED backlight according to this application;

[0043] Figure 9 This is a schematic diagram of the optical path of embodiment 3 of a light guide plate for a MiniLED backlight according to this application;

[0044] Figure 10 This is a schematic diagram of the optical path of embodiment 4 of a light guide plate for a MiniLED backlight according to this application;

[0045] Figure 11 This is a frontal projection view of the dot groove of Embodiment 4 of a light guide plate for a MiniLED backlight according to this application;

[0046] Figure 12 This is a frontal projection view of the dot groove of Embodiment 4 of a light guide plate for a MiniLED backlight according to this application;

[0047] Figure 13 This is a schematic diagram of the optical path of embodiment 5 of a light guide plate for a MiniLED backlight according to this application;

[0048] Figure 14 This is a frontal projection view of the dot groove of Embodiment 5 of a light guide plate for a MiniLED backlight according to this application;

[0049] Figure 15 This is a three-dimensional structural schematic diagram of Embodiment 6 of the light guide plate for a MiniLED backlight of this application;

[0050] Figure 16 This is a logic block diagram of a dot matrix processing technology for a light guide plate used in a MiniLED backlight according to this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Light guide plate body; 2. Diffusing surface; 3. Beam splitting surface; 4. Dot groove; 5. Recessed portion; 501. First recessed surface; 502. Second recessed surface; 6. LED lamp bead; 7. First beam splitting portion; 701. First inclined surface; 702. Second inclined surface; 8. Second beam splitting portion; 801. Third inclined surface; 802. Fourth inclined surface; 9. Orthographic projection surface of the dot groove; 10. Orthographic projection surface of the first recessed surface; 11. Orthographic projection surface of the second recessed surface; 12. Orthographic projection surface of the first inclined surface; 13. Orthographic projection surface of the second inclined surface; 14. Orthographic projection surface of the third inclined surface; 15. Orthographic projection surface of the fourth inclined surface; 16. First prism protrusion; 17. Second prism protrusion; 18. First surface. Detailed Implementation

[0053] The following is a detailed description of a light guide plate for a MiniLED backlight, with reference to the accompanying drawings.

[0054] Example 1:

[0055] Reference Figure 1 and Figure 2 A light guide plate for a MiniLED backlight includes a light guide plate body 1. The light guide plate body 1 can be made of optical film materials such as PC material or PMMA material, and the thickness of the light guide plate body 1 can be 0.4mm. The light guide plate body 1 includes a diffusion surface 2 and a beam splitting surface 3. The diffusion surface 2 is used for light emission, and the beam splitting surface 3 is used for light diffusion. In this embodiment, the LED lamp board is located below the beam splitting surface 3 and receives light through the beam splitting surface 3. Multiple dot grooves 4 are formed on the beam-splitting surface 3 to refract and diffuse light. The multiple dot grooves 4 are recessed into the light guide plate body 1. The multiple dot grooves 4 are arranged in a matrix and correspond one-to-one with the LED beads 6. The depth of the multiple dot grooves 4 is set in the range of 1um-20um. Each dot groove 4 covers the corresponding LED bead 6, which can effectively enable the light guide plate to be quickly positioned on the LED light board, reduce the offset between the light guide plate and the LED light board, split and diffuse the light emitted by the LED beads 6, reduce the gap between the LED beads 6 and the light guide plate, make the backlight thinner, facilitate the positioning and assembly between the LED light board and the light guide plate, optimize the assembly process of miniLED backlight, and solve the problem of poor beam splitting effect caused by the misalignment or the gap between the multiple beam splitting films installed on the backlight.

[0056] The diffuser surface 2 is provided with spark patterns or etching patterns to enhance the roughness of the diffuser surface 2, enhance the atomization effect of the diffuser surface 2, and improve the softness and uniformity of the light output of the light guide plate. In this embodiment, the spark patterns can be formed by spark discharge machining, and the etching patterns can be formed by etching process.

[0057] Reference Figure 3Specifically, each dot groove 4 is a conical groove, the diameter of the groove opening of each dot groove 4 is larger than the diameter of the groove bottom, and the groove wall of each dot groove 4 is inclined from the groove opening to the bottom towards the end closer to the light guide plate body 1. The included angle between the groove wall of the dot groove 4 and the beam splitting surface 3 is set in the range of 110°-160°, and the included angle between the groove bottom of the dot groove 4 and the groove wall is set in the range of 110°-160°.

[0058] Furthermore, the wall of the dot groove 4 is provided with recessed portions 5, which are recessed towards the end away from the dot groove 4. The recessed portions 5 are arranged circumferentially along the wall of the dot groove 4, and each recessed portion 5 includes a first recessed surface 501 and a second recessed surface 502. In this embodiment, multiple recessed portions 5 can be provided. The first recessed surfaces 501 and second recessed surfaces 502 of the multiple recessed portions 5 are arranged alternately along the wall of the dot groove 4 from the opening to the bottom of the dot groove 4, and the width of the multiple recessed portions 5 gradually decreases from the opening to the bottom of the dot groove 4 along the width direction of the wall of the dot groove 4. The opposite sides of the first recessed surfaces 501 and second recessed surfaces 502 of two adjacent recessed portions 5 coincide and connect to form a bottom corner. In each recessed portion 5, the two opposite sides of the first recessed surface 501 and the second recessed surface 502 coincide and connect to form a apex angle. In this embodiment, the bottom angle ∅_1 is set in the range of 100°-110°, and the top angle ∅_2 is set in the range of 100°-120°. This setting is beneficial for the light emitted by the LED beads 6 to be refracted and guided into the gap between two adjacent dot grooves 4, thereby improving the light guiding effect.

[0059] Reference Figure 4 When the dot groove 4 is projected orthographically onto the beam-splitting surface 3, the orthographic projection surface of the dot groove 4 is circular. Specifically, the orthographic projection surface of the bottom of the dot groove 4 is circular. The orthographic projection surfaces 10 and 11 of the first and second recessed surfaces are both annular. The center of the orthographic projection surface of the bottom of the dot groove 4 coincides with the centers of the orthographic projection surfaces 10 and 11 of the first and second recessed surfaces. In this embodiment, the diameter of the orthographic projection surface of the bottom of the dot groove 4 is equal to the diameter of the inner circumference of the orthographic projection surface 11 of the second recessed surface closest to the bottom of the dot groove 4. The diameter of the orthographic projection surface 10 of the first recessed surface is larger than the diameter of the orthographic projection surface 11 of the second recessed surface.

[0060] Reference Figure 3When the top and bottom angles remain constant, the depth of the plurality of recesses 5 gradually increases from the bottom of the dot matrix groove 4 to the opening of the dot matrix groove 4 along the sidewall of the dot matrix groove 4. The width of the first recessed surface 501 and the second recessed surface 502 in each recessed part 5 are equal, and the width of both the first recessed surface 501 and the second recessed surface 502 of the plurality of recesses 5 gradually increases from the bottom of the dot matrix groove 4 to the opening along the width direction of the sidewall of the dot matrix groove 4. In this embodiment, the arrangement of the depth of the plurality of recesses 5 from the bottom of the dot matrix groove 4 to the opening of the dot matrix groove 4 along the sidewall of the dot matrix groove 4 is either linearly varied or varied by a Bezier progression curve.

[0061] like Figure 5 The graph shows a linear variation in the depth of the recessed portion 5, with the horizontal axis representing the height of the dotted groove 4 and the vertical axis representing the depth of the recessed portion 5. The linear equation is y = kx + b, where k represents the ratio of the depths of two adjacent recessed portions 5, and b is a constant. When the horizontal axis x is larger and the vertical axis y is smaller, the height of the dotted groove 4 is higher, and the depth of the recessed portion 5 is lower. This increases the light-receiving area of ​​the first recessed surface 501 and the second recessed surface 502, allowing more light to be refracted into the gap between two adjacent dotted grooves 4, thus reflecting the light to the diffuser surface 2 and improving the uneven brightness of the light emitted by the light guide plate.

[0062] When the depths of multiple recesses 5 are arranged in a manner that varies with a Bezier curve, such as Figure 6 The Bézier curve diagram shown has the horizontal axis representing the height of the dot groove 4 and the vertical axis representing the depth of the recess 5. Due to QUOTE This is the equation for an advanced Bézier curve. Where, QUOTE The position vectors of (n+1) reflective protrusions are set, which are used to control the depth of each recess 5. (i=0,1,2,3,...,n) is the Bernstein function. When the control point is QUOTE When changes occur, the depth of the recess 5 gradually decreases as the height of the dot groove 4 increases, thus enabling precise control of the light energy distribution and allowing more light to be refracted into the gap between two adjacent dot grooves 4.

[0063] Looking back Figure 3When the light guide plate is installed on the LED lamp board, the dot groove 4 covers the LED beads 6. At this time, some of the light emitted by the LED beads 6 is refracted into the interior of the light guide plate body 1 through the first recessed surface 501 of the multiple recessed parts 5. At this time, some of the light is located between two adjacent dots, and then reflected by the beam splitting surface 3 to the diffusion surface 2, where the light is refracted out. At the same time, some of the light is refracted into the interior of the light guide plate body 1 through the bottom of the dot groove 4 and tends to exit through the diffusion surface 2. Some of the light is refracted into the interior of the light guide plate body 1 through the second recessed surface 502, where it tends to exit through the diffusion surface 2. This can increase the diffusion effect of the light guide plate on the light emitted by the LED lamp board, thereby improving the brightness of the gap between two adjacent LED beads 6 and solving the problem of uneven brightness caused by the gap between the light guide plate and the lamp board.

[0064] The implementation principle of Embodiment 1 of the light guide plate for MiniLED in this application is as follows: By setting multiple dot grooves 4 on the beam splitting surface 3, each dot groove 4 corresponds to an LED bead 6, and each dot groove 4 covers the corresponding LED bead 6, so as to reduce the gap between the LED bead 6 and the dot groove 4. At this time, the light of the LED bead 6 can be refracted into the blind area through the dot groove 4. At the same time, the first concave surface 501 and the second concave surface 502 play a guiding and diffusion role for the light, splitting the light and guiding more light to the blind area, thereby making the brightness of the light emitted by the light guide plate uniform.

[0065] Example 2:

[0066] Reference Figure 7 Unlike Embodiment 1, the top angle remains unchanged while the bottom angle changes. The depth of the multiple recesses 5 gradually increases from the bottom to the opening of the dot groove 4 along the wall of the dot groove 4. In this embodiment, the arrangement of the depth of the multiple recesses 5 can also be set to change linearly or by a Bezier curve from the bottom to the opening of the dot groove 4 along the width direction of the wall of the dot groove 4. In this case, the recesses 5 form an isosceles V-shaped annular groove, and the width of the first recessed surface 501 gradually increases from the bottom to the opening of the dot groove 4 along the wall of the dot groove 4. The width of the first recessed surface 501 is greater than the width of the second recessed surface 502, thereby increasing the light-receiving area of ​​the first recessed surface 501, which is beneficial for guiding light and optimizing the overall effect of the recesses 5.

[0067] Reference Figure 8 When the dot groove 4 is projected onto the beam splitting surface 3, the projection surfaces 10 and 11 of the first concave surface are both annular. The projection surfaces 10 and 11 of the first concave surface coincide with the center of the circle along the projection surface of the bottom of the dot groove 4. At this time, the width of the projection surface 10 of the first concave surface is greater than the width of the projection surface 11 of the second concave surface, indicating that the light-receiving area of ​​the first concave surface 501 is greater than that of the second concave surface 502.

[0068] Reference Figure 7 Specifically, the first recessed surface 501 of the multiple recessed portions 5 gradually slopes away from the wall of the dot groove 4 from the bottom of the groove to the opening of the groove 4. At this time, the angle of the top corner is set in the range of 110°-160° and the angle of the bottom corner is set in the range of 30°-75°, which enhances the guiding effect of light. This allows more light to be refracted through the first recessed surface 501 into the interior of the light guide plate body 1 and then reflected between the two dot grooves 4 to the diffusion surface 2. This optimizes the light diffusion and splitting effect, increases the refraction and diffusion range of light, and allows more light to be refracted and transmitted to the blind area with less light. The light reflected from the blind area to the diffusion surface 2 improves the overall luminous brightness of the MiniLED backlight.

[0069] The implementation principle of Embodiment 2 of the light guide plate for MiniLED backlight of this application is as follows: the first concave surface 501 is larger than the second concave surface 502, so that the light-receiving area of ​​the first concave surface 501 is larger than the light-receiving area of ​​the second concave surface 502. The depth of the concave part 5 gradually increases. At this time, the first concave surface 501 gradually tilts towards the gap between two adjacent dot grooves 4, so that the light emitted by the LED lamp bead 6 is refracted by the first concave surface 501 and guided to the blind area, thereby improving the light guiding effect of the light guide plate.

[0070] Example 3:

[0071] Reference Figure 9 Unlike embodiment 2, the groove wall of the dot groove 4 transitions from the groove opening to the bottom of the dot groove 4 in an arc shape, and gradually protrudes towards the interior of the light guide plate body 1. In this embodiment, the radius of curvature of the groove wall of the dot groove 4 is set in the range of 100um-200um, preferably 150um. This setting can further optimize the light guiding effect of the recessed part 5, so that the first recessed surface 501 closer to the beam splitting surface 3 can be more inclined to guide to the blind area, thereby increasing the diffusion range of light and further improving the uneven brightness of the light output from the light guide plate.

[0072] The implementation principle of Embodiment 3 of the light guide plate for MiniLED in this application is as follows: by setting the groove wall of the dot groove 4 to be arc transition, the multiple recesses 5 are arranged sequentially along the arc length direction of the groove wall of the dot groove 4. This makes the distribution of light refraction into the gap between two adjacent dot grooves 4 more reasonable, so as to optimize the diffusion effect.

[0073] Example 4:

[0074] Reference Figure 10Unlike Embodiments 1 and 2, both the first recessed surface 501 and the second recessed surface 502 are arc-shaped surfaces. In this embodiment, the first recessed surface 501 and the second recessed surface 502 are arc-shaped transitions from the side edge connected to the groove wall of the dot groove 4 to the side edge that overlaps with it, and gradually protrude towards the end away from the dot groove 4.

[0075] The arc length of the first concave surface 501 is greater than that of the second concave surface 502 to increase the light-receiving area of ​​the first concave surface 501. The radius of curvature of the first concave surface 501 is greater than that of the second concave surface 502. The radius of curvature of the first concave surface 501 is set in the range of 100um-200um, and the radius of curvature of the second concave surface 502 is set in the range of 40um-80um. This increases the refraction and diffusion range of light by the first concave surface 501 and the second concave surface 502, thus optimizing the diffusion effect of light.

[0076] Reference Figure 11 When the dot groove 4 is projected onto the beam splitting surface 3, the projection surface 10 of the first recessed surface and the projection surface 11 of the second recessed surface in each recessed part 5 are both annular. The projection surface 10 of the first recessed surface and the projection surface 11 of the second recessed surface coincide with the center of the projection surface of the bottom of the dot groove 4. The width of the first recessed surface 501 is greater than the width of the second recessed surface 502.

[0077] Reference Figure 12 Furthermore, the first recessed surface 501 and the second recessed surface 502 can be arc-shaped transitions from the side edge connected to the groove wall of the dot groove 4 to the side edge that overlaps with it, and gradually recess towards the end away from the dot groove 4. In this embodiment, the connection between the first recessed surface 501 and the second recessed surface 502 forms a bottom corner. The bottom angle is set within the range of 10°-35°. The first recessed surface 501 and the second recessed surface 502 in two adjacent recessed portions 5 connect to form a apex angle. The apex angle setting range is 80°-100°.

[0078] The implementation principle of Embodiment 4 of the light guide plate for MiniLED backlight of this application is as follows: by setting the first concave surface 501 and the second concave surface 502 as arc surfaces, the refraction and diffusion range of light is further increased, the diffusion effect of the concave part 5 is optimized, and the light splitting effect is improved.

[0079] Example 5:

[0080] Reference Figure 13Unlike Embodiments 2 and 4, the wall of the dot groove 4 is provided with a plurality of first beam splitting parts 7 and second beam splitting parts 8. The plurality of first beam splitting parts 7 and the plurality of second beam splitting parts 8 are arranged sequentially from the bottom of the dot groove 4 along the width direction of the wall of the dot groove 4.

[0081] In this embodiment, the first beam splitter 7 includes a first inclined surface 701 and a second inclined surface 702, wherein the width of the first inclined surface 701 is greater than the width of the second inclined surface 702. At this time, the opposite sides of the first inclined surface 701 and the second inclined surface 702 in the first beam splitter 7 coincide and connect to form a first bottom angle, the range of which is 30°-75°. Both the first inclined surface 701 and the second inclined surface 702 are inclined from the wall of the dot groove 4 to the opposite sides towards the end away from the dot groove 4. The angle between the first inclined surface 701 and the beam splitter 3 is set in the range of 100°-140°, and the angle between the second inclined surface 702 and the beam splitter 3 is set in the range of 110°-140°.

[0082] The second beam splitter 8 includes a third inclined surface 801 and a fourth inclined surface 802. The opposite sides of the third inclined surface 801 and the fourth inclined surface 802 overlap and connect. The third inclined surface 801 transitions in an arc from the side overlapping with the second inclined surface 802 to the opposite sides towards the end away from the dot groove 4, and gradually concaves towards the end closer to the dot groove 4. The fourth inclined surface 802 transitions in an arc from the side overlapping with the first inclined surface 701 to the opposite sides towards the end away from the dot groove 4, and gradually convexes towards the end closer to the dot groove 4. The arc length of the third inclined surface 801 is less than the arc length of the fourth inclined surface 802. In this embodiment, the radius of curvature of the third inclined surface 801 is set in the range of 100um-200um, and the radius of curvature of the fourth inclined surface 802 is set in the range of 40um-80um. Adjacent fourth inclined surfaces 802 overlap and connect with the first inclined surface 701 to form a first apex angle. The adjacent second inclined surface 702 and the third inclined surface 801 have their opposite sides connected to form the second apex. The two opposite sides of the third inclined surface 801 and the fourth inclined surface 802 coincide and connect to form the second base angle. The angle of the first base angle is greater than the angle of the second base angle. The setting range is 100°-160°, second bottom corner QUOTE The setting range is 100°-160°.

[0083] The angles of the apex and bottom corners remain unchanged. The depth of the first beam splitter 7 is lower than the depth of the second beam splitter 8. Specifically, the depth difference between the first beam splitter 7 and the second beam splitter 8 is set within the range of 3um-8um. The depths of the multiple first beam splitters 7 and the multiple second beam splitters 8 gradually increase from the bottom of the dot groove 4 to the opening of the dot groove 4.

[0084] Reference Figure 14 When the dot groove 4 is projected onto the dot surface, the projection surfaces 12, 13, 14, and 15 of the first inclined surface are all annular, and their centers coincide. Between two adjacent first inclined recesses 5 and second beam splitters 8, the diameter of the projection surface 12 of the first inclined surface is greater than that of the projection surface 13 of the second inclined surface, which is greater than that of the projection surface 14 of the third inclined surface, which is greater than that of the projection surface 15 of the fourth inclined surface. The width of the projection surface 12 of the first inclined surface is greater than that of the projection surface 13 of the second inclined surface, which is greater than that of the projection surface 14 of the third inclined surface, which is greater than that of the projection surface 15 of the fourth inclined surface.

[0085] Reference Figure 15 When the light emitted by the LED bead 6 is refracted by the first inclined surface 701 and the second inclined surface 702 into the blind zone between two adjacent dot slots 4, part of the light is diffused and split. Part of the light is refracted by the third inclined surface 801 and guided into the gap between the two adjacent dot slots 4. The light from the second inclined surface 702 is also guided, causing part of the light refracted from the second inclined surface 702 to change its transmission direction and tend to exit the beam splitting surface 3. The fourth inclined surface 802 refracts and guides part of the light to tend to exit the diffuser surface 2. This can effectively distribute the light energy reasonably, improve the light energy utilization rate, enhance the brightness, and improve the uniformity of light output.

[0086] The implementation principle of Embodiment 5 of the light guide plate for MiniLED backlight of this application is as follows: by setting multiple first beam splitters 7 and second beam splitters 8, the light emitted by LED beads 6 is refracted and diffused. The first beam splitters 7 and second beam splitters 8 work together to improve light energy utilization, enhance light brightness, and improve light output uniformity.

[0087] Example 6:

[0088] Unlike Embodiment 1, the beam-splitting surface 3 is provided with a plurality of first prism protrusions 16 and a plurality of second prism protrusions 17. The plurality of first prism protrusions 16 are all triangular prisms, and the opposite sides of two adjacent first prism protrusions 16 are connected, and the opposite sides of two adjacent second prism protrusions 17 are connected. In this embodiment, the height of the first prism protrusion 16 is equal to that of the second prism protrusion 17. The plurality of first prism protrusions 16 and the plurality of second prism protrusions 17 are perpendicularly intersecting to form an inwardly recessed diffusion portion.

[0089] Specifically, the diffuser includes four first surfaces 18. The side of each first surface 18 closest to the beam-splitting surface 3 is connected to the beam-splitting surface 3. The opposite sides of two adjacent first surfaces 18 are connected. The angle between two adjacent first surfaces 18 is set in the range of 30°-80°. The included angle between each first surface 18 and the beam-splitting surface 3 is set in the range of 40°-70°.

[0090] When light is dispersed from the beam-splitting surface 3 to the diffusion surface 2, the four first surfaces 18 are inclined and can diffuse and refract the light to adjust the direction of the light again, so that the light can be emitted more evenly and the brightness of the light output can be improved.

[0091] The implementation principle of Embodiment 6 of the light guide plate for MiniLED backlight of this application is as follows: by setting multiple first prism protrusions 16 and second prism protrusions 17 to form an inwardly recessed diffusion part, the light is diffused after being refracted by the diffusion part, so as to guide the light again and make the light more uniform.

[0092] This application also discloses a dot matrix processing technology for a light guide plate used in MiniLED backlights.

[0093] Reference Figure 16 A dot matrix processing technology for a light guide plate used in a MiniLED backlight includes the following steps:

[0094] S1. The dot depressions are formed on the mold core;

[0095] S2. Cast the mold core to form a steel plate with raised dots;

[0096] S3. The steel plate with raised dots is transferred to the diffusion surface 2 of the light guide plate to form a dot groove 4.

[0097] The principle of the dot processing technology for a light guide plate for a MiniLED backlight is as follows: dot recesses are formed in the mold core, and then a steel plate with dot protrusions is formed by casting. The steel plate is then transferred to the diffusion surface of the light guide plate to form the required dot grooves. This allows the dots to have an inwardly recessed structure, which improves the production quality of the light guide plate and reduces production costs.

[0098] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A light guide plate for a MiniLED backlight, comprising a light guide plate body (1), wherein the opposite two surfaces of the light guide plate body (1) are a diffusion surface (2) and a beam-splitting surface (3), characterized in that, The beam-splitting surface (3) is provided with a plurality of dot grooves (4), each of which corresponds to and covers an LED bead (6). The plurality of dot grooves (4) are recessed into the light guide plate body (1). The groove walls of the plurality of dot grooves (4) are provided with a plurality of recesses (5) for refracting light. The plurality of recesses (5) are arranged circumferentially along the groove walls of the dot grooves (4). The recesses (5) are recessed towards the end away from the dot grooves (4). The plurality of recesses (5) are arranged sequentially from the groove opening to the bottom of the dot grooves (4) along the width direction of the groove walls. The depth of the plurality of recesses (5) gradually increases from the bottom to the groove opening along the height direction of the groove walls. The depth of the plurality of recesses (5) varies with a Bezier curve.

2. A light guide plate for a MiniLED backlight according to claim 1, wherein the recessed portion (5) includes a first recessed surface (501) and a second recessed surface (502), and the first recessed surface (501) and the second recessed surface (502) of the plurality of recessed portions (5) are arranged sequentially along the wall of the dot groove (4) from the opening of the dot groove (4) to the bottom of the dot groove (4), and the opposite sides of the first recessed surface (501) and the second recessed surface (502) overlap and connect to form a bottom corner, wherein the angle of the bottom corner is set in the range of 100°-110°.

3. A light guide plate for a MiniLED backlight according to claim 2, characterized in that: The width of the first recessed surface (501) is greater than the width of the second recessed surface (502).

4. The light guide plate for a MiniLED backlight according to claim 1, characterized in that: The dot groove (4) is a conical groove, and the groove wall of the dot groove (4) is inclined from the groove opening to the bottom towards the end closer to the interior of the light guide plate body (1).

5. A light guide plate for a MiniLED backlight according to claim 2, characterized in that: The first recessed surface (501) is an arc-shaped surface, and the first recessed surface (501) transitions from the side edge away from the groove wall of the dot groove (4) to the side edge connected to the second recessed surface (502) with a circular arc.

6. A light guide plate for a MiniLED backlight according to claim 1, characterized in that: The groove wall of the dot groove (4) transitions from the groove opening to the bottom of the dot groove (4) in an arc, and gradually protrudes towards the interior of the light guide plate body (1).

7. A light guide plate for a MiniLED backlight according to claim 1, characterized in that: The diffusion surface (2) is provided with spark patterns or sunburst patterns.

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