Collimation backlight source display module LGP dot microstructure and backlight source display module

Abstract

The invention discloses a collimating backlight display module LGP lattice point microstructure and a backlight display module, the LGP lattice point microstructure is characterized in that horseshoe-shaped lattice points are arranged on a light reflecting surface of a light guide film, and an inverse prism film is attached to a light emitting surface of the light guide film; the backlight source display module comprises a light guide film with the lattice point microstructure, an LED lamp, an inverse prism film and an upper diffusion film, the LED lamp is arranged on the light inlet face of the light guide film, the inverse prism film is attached to the light outlet face of the light guide film, and the upper diffusion film is arranged above the inverse prism film. The design limitation of a traditional light guide plate is broken through, the inverse prism technology and the LGP technology of an innovative collimation backlight source are adopted, the light guide plate is provided with a horseshoe-shaped lattice point microstructure, accurate guiding and transmission of light are achieved, refraction and reflection losses of the light in the light guide plate are effectively reduced, the accuracy of a light emitting path is ensured, and the light guide plate is suitable for large-scale popularization and application. And a core foundation is laid for improvement of subsequent lighting effect and uniformity.

Description

TECHNICAL FIELD

[0001] The application discloses a backlight display module, in particular a collimated backlight display module LGP dot microstructure and a backlight display module, which is suitable for the technical field of backlight display and touch integration modules. BACKGROUND

[0002] An LCD display module does not emit light by itself, and needs a backlight to provide light for imaging, therefore, the backlight display module is a core component of an LCD display module, and the backlight display module provides uniform, stable and controllable backlight for a liquid crystal panel, and determines the brightness, uniformity and color gamut of a screen.

[0003] Please refer to the accompanying drawings Figure 1 The accompanying drawings Figure 2 and the accompanying drawings Figure 3 The main body of the traditional backlight display module is a light guide film 1 (LGP), the light guide film 1 is provided with an LED lamp 2 on the side, the light guide film 1 is illuminated in a side-in light mode, the light guide film 1 is provided with a circular dot 11 at the bottom, and the light guide film 1 is provided with a V-CUT groove 12 at the top. The traditional backlight display module adopts a conventional light guide technology and is matched with a 4Film (optical film) frame, and usually includes a plurality of layers of structures such as a lower diffusion film 3, a lower light enhancement film 4, an upper light enhancement film 5 and an upper diffusion film 6. Due to the relatively complex structure, some inherent prominent problems usually exist, mainly including: the product thickness is large and the weight is heavy due to the superposition of the plurality of layers of film materials, it is difficult to meet the development demand of current display equipment thinning; the light efficiency is low, usually only 62%, which leads to high product power consumption; (3) the light uniformity is insufficient, usually only 78%, which affects the stability of the display effect; (4) the anti-peeping function is lacked, the privacy protection demand in special scenes cannot be met, and the use of the plurality of layers of film materials increases the production process complexity and cost.

[0004] In summary, in the field of the traditional backlight display module, the light efficiency and uniformity are always the key bottleneck restricting the performance improvement of the product. SUMMARY

[0005] In view of the poor light efficiency and uniformity of the backlight display module in the prior art, the application provides a collimated backlight display module LGP dot microstructure and a backlight display module, which adopts inverse prism technology and innovative LGP (light guide plate) technology of a collimated backlight, realizes accurate guidance and transmission of light by arranging a horseshoe-shaped dot microstructure on the light guide plate, effectively reduces the refraction and reflection loss of light in the light guide plate, and ensures the accuracy of the light path, thereby laying a core foundation for the improvement of the light efficiency and uniformity.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a collimated backlight display module LGP dot microstructure, the LGP dot microstructure is provided with a horseshoe-shaped dot on the light-reflecting surface of a light guide film, and an inverse prism film is attached to the light-emitting surface of the light guide film.

[0007] A backlight display module, which comprises a light guide film with the dot microstructure described above, an LED lamp, an inverse prism film and an upper diffusion film, the LED lamp is arranged at the light-incident surface of the light guide film, the inverse prism film is attached to the light-emitting surface of the light guide film, and the upper diffusion film is arranged above the inverse prism film.

[0008] The technical scheme adopted by the present application to solve its technical problems further comprises: The horseshoe-shaped dot adopts a concave structure.

[0009] The horseshoe-shaped dot is approximately an isosceles triangle, the base is directed to the light-incident surface of the light guide film, the two waists are respectively arc-shaped and protrude outward, the base is flush with the bottom surface of the light guide film, and the deeper the concave structure is, the closer to the top corner position, thereby forming a horseshoe shape directed to the light-incident surface of the light guide film.

[0010] The included angle between the inclined plane and the bottom surface of the light guide film is defined as the light-incident angle θ, and 30°< light-incident angle θ < 45°.

[0011] The length of the base of the horseshoe-shaped dot is 30 μm to 80 μm, preferably 55 μm, and the distance between the base and the top corner is 40 μm to 85 μm, preferably 62.5 μm.

[0012] The horseshoe-shaped dots are distributed in a matrix on the light guide film, the distance between the center points of adjacent horseshoe-shaped dots in the direction perpendicular to the light-incident surface of the light guide film is X, and the distance between the center points of adjacent horseshoe-shaped dots in the direction parallel to the light-incident surface of the light guide film is Y, the value of X gradually decreases from the light-incident side to the tail, and the value of Y is equidistant or locally slightly smaller.

[0013] The prisms of the inverse prism film are directed to the side of the light guide film.

[0014] The present application has the following beneficial effects: the present application breaks through the design limitations of traditional light guide plates, adopts the inverse prism technology and innovative LGP (light guide plate) technology of collimated backlight, sets the horseshoe-shaped dot microstructure on the light guide plate, realizes accurate guidance and transmission of light, effectively reduces the refraction and reflection loss of light in the light guide plate, ensures the accuracy of the light-emitting path, and lays a core foundation for the subsequent improvement of light efficiency and uniformity.

[0015] The present application deeply fuses the reverse prism technology and the collimation LGP technology, forms a synergistic mechanism through multiple rounds of optical performance testing and structure iterative optimization. The reverse prism structure has special light converging and guiding functions, can perform secondary optimization on the light guided by the collimation LGP, and further improves the parallelism and utilization rate of the light. After multiple rounds of optimization iteration, the synergistic technical scheme realizes significant performance improvement: the light efficiency is greatly improved from 62% of the traditional to 91%, the light utilization rate is increased by nearly 50%; the uniformity is improved from 78% to 88%, the brightness consistency of the display picture is significantly optimized, and the pain point of uneven brightness of the traditional module is effectively solved. The reverse prism structure not only realizes the improvement of light efficiency and uniformity, but also has a privacy function. Its special optical structure can limit the propagation angle of light, and only within a certain viewing angle range at the front, a clear picture can be seen, and the light is effectively blocked at the side viewing angle, so that natural privacy is realized without the need for additional privacy film, simplifying the product structure.

[0016] The collimation backlight display module structure in the present application is thinned and lightened, the overall thickness of the product is thinned by 0.1-0.2mm and the weight is lightened by 10-15g through the integration of film materials.

[0017] After the LED light is emitted through the special pattern of the LGP, the direction of the light emitted from the surface of the LGP has high convergence and concentration, the light efficiency is greatly improved from 62% to 91%, thereby realizing the reduction of product power consumption.

[0018] After the LED light is emitted through the special pattern of the LGP, the direction of the light emitted from the surface of the LGP has high convergence and concentration, and the reverse prism can narrow the light in the vertical direction, realizing the privacy function.

[0019] The present application will be further described below in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the traditional backlight display module structure in the prior art.

[0021] Figure 2 It is a schematic diagram of the A part of the traditional backlight display module structure in the prior art. Figure 1

[0022] Figure 3 It is a schematic diagram of the traditional backlight display module structure in the prior art.

[0023] Figure 4 It is a schematic diagram of the traditional backlight display module structure in the prior art.

[0024] Figure 5 It is a schematic diagram of the traditional backlight display module structure in the prior art. Figure 4 ​A magnified schematic diagram of the B-section structure.

[0025] Figure 6 This is a schematic diagram of a partial cross-sectional structure of the backlight display module in this invention (with light path indication).

[0026] Figure 7 This is a half-brightness view image using the FWHM of the present invention.

[0027] Figure 8 This is a flowchart illustrating the design and manufacturing process of the present invention.

[0028] In the diagram, 1-light guide film, 11-circular dots, 12-V-CUT groove, 13-horseshoe dots, 2-LED light, 3-lower diffuser film, 4-lower brightness enhancement film, 5-upper brightness enhancement film, 6-upper diffuser film, 7-reverse prism film. Detailed Implementation

[0029] This embodiment is a preferred embodiment of the present invention. All other embodiments that are the same as or similar to this embodiment in principle and basic structure are within the protection scope of the present invention.

[0030] Please refer to the appendix. Figure 4 Appendix Figure 5 and attached Figure 6 The present invention mainly protects a collimated backlight display module LGP dot microstructure, which has horseshoe-shaped dots 13 on the reflective surface of the light guide film 1 (i.e. LGP), and a reverse prism film 7 is attached to the light emitting surface of the light guide film 1.

[0031] In this embodiment, since the light guide film 1 usually adopts a side-lighting method, the LED lamp 2 is set on the side of the light guide film 1. The conventional setting method is to set the LED lamp 2 on one side of the light guide film 1, and this side is defined as the light-incident surface of the light guide film 1 in this invention.

[0032] In this embodiment, the horseshoe-shaped dots 13 adopt a concave structure, that is, the horseshoe-shaped dots 13 are concave dots processed by embossing, laser melting or other methods.

[0033] In this embodiment, the horseshoe-shaped dot 13, viewed from above (i.e., from the light-emitting side of the light guide film 1), is horseshoe-shaped. Specifically, its shape is approximately an isosceles triangle (for ease of description, it is described according to the definition of a triangle). The base of the triangle faces the light-incident surface of the light guide film 1, and the two sides of the triangle are respectively outwardly convex arcs. Because the horseshoe-shaped dot 13 has a concave structure, the base of the triangle is flush with the bottom surface of the light guide film 1, and the concavity deepens towards the apex of the triangle, thus forming a horseshoe-shaped inclined plane facing the light-incident surface of the light guide film 1. The angle between the plane and the bottom surface of the light guide film 1 (more precisely, if multiple LED lights 2 are arranged in a line, it can be regarded as a line light source, and the light emitted by this light source is defined as a plane, which is usually parallel to the bottom surface of the light guide film 1) is defined as the light-facing angle θ. 30° < light-facing angle θ < 45°, which increases the probability of horizontal light hitting the dots, and achieves precise guidance and transmission of light in one output, effectively reducing the refraction and reflection loss of light inside the light guide plate, ensuring the accuracy of the light output path, thereby providing support for the improvement of light efficiency and uniformity, and simultaneously achieving the upper and lower anti-peeping effect.

[0034] In this embodiment, the length of the bottom edge of the horseshoe-shaped dot 13 is 30μm~80μm, preferably 55μm, and the distance between the bottom edge and the top corner is 45μm~85μm, preferably 62.5μm. In this embodiment, the radius of the two outwardly protruding arcs is 40μm~120μm, preferably R70μm.

[0035] In this embodiment, the horseshoe-shaped dots 13 are distributed in a matrix on the light guide film 1. The distance between adjacent horseshoe-shaped dots 13 (the distance between the center points of adjacent horseshoe-shaped dots 13, not the edge spacing) is defined as X in the direction perpendicular to the light-incident surface of the light guide film 1. The distance between adjacent horseshoe-shaped dots 13 (the distance between the center points of adjacent horseshoe-shaped dots 13, not the edge spacing) is defined as Y in the direction parallel to the light-incident surface of the light guide film 1. The X value can be equidistant, and the X value can be selected from 100μm to 250μm. Alternatively, the X value can be selected to gradually decrease from the light-incident side to the tail. The maximum value can be selected from 100μm to 250μm. Alternatively, the X value can be 250μm from the light-incident side and gradually decrease to 100μm at the tail, with a uniform change. The Y value is generally reduced at equal intervals or with local fine adjustments. The Y value can be selected from 75μm to 200μm to match the size of the horseshoe-shaped dots 13. Combined with the set light-facing angle θ, the probability of horizontal light hitting the dots is increased. Furthermore, the light is accurately guided and transmitted in a single output, effectively reducing the refraction and reflection loss of light inside the light guide plate and ensuring the accuracy of the light output path. This provides support for improving light efficiency and uniformity, and simultaneously achieves the upper and lower privacy protection effect.

[0036] In this embodiment, the prism of the reverse prism film 7 faces the light guide film 1.

[0037] This invention also protects a backlight display module, which mainly includes a light guide film 1 with the above-mentioned dot microstructure, an LED lamp 2, a reverse prism film 7, and an upper diffuser film 6. The LED lamp 2 is disposed at the light-incident surface of the light guide film 1, the reverse prism film 7 is attached to the light-emitting surface of the light guide film 1, and the upper diffuser film 6 is disposed above the reverse prism film 7. In this invention, a single reverse prism structure can directly replace the three key film materials of the lower diffuser film 3, the lower brightness enhancement film 4, and the upper brightness enhancement film 5 in the traditional 4Film frame. Through the integrated replacement of film materials, the overall thickness of the product is reduced by 0.1-0.2 mm, and the weight is reduced by 10-15 g.

[0038] The effects of using this invention can be seen in the appendix. Figure 7 , attached Figure 7 It can intuitively illustrate the screen's brightness performance at different angles.

[0039] Please refer to the appendix for details. Figure 8 The process from design to sample production of this invention includes the following steps: Step S1: Design the collimated light source structure; Step S2: Design the LGP structure; Step S3: Import LightTools software; Step S4: Arrange the LEDs evenly according to the AA size; Step S5: Load LGP dots and V-CUT slots; Step S6: Simulation and optimization of optical effects; Step S7: Mold development; Step S8: Complete sample preparation.

[0040] If the sample tests negative, mass production can proceed.

[0041] This invention breaks through the design limitations of traditional light guide plates by using reverse prism technology and innovative collimated backlight LGP (light guide plate) technology. By setting horseshoe-shaped dot microstructures on the light guide plate, it achieves precise guidance and transmission of light, effectively reducing the refraction and reflection loss of light inside the light guide plate, ensuring the accuracy of the light path, and laying the core foundation for subsequent improvement of light efficiency and uniformity.

[0042] This invention deeply integrates reverse prism technology with collimated LGP technology, forming a synergistic mechanism through multiple rounds of optical performance testing and structural iteration optimization. The reverse prism structure possesses unique light-converging and guiding functions, enabling secondary optimization of the light rays exported by the collimated LGP, further improving the parallelism and utilization rate of the light. After multiple rounds of optimization and iteration, this synergistic technology solution achieves significant performance improvements: luminous efficacy increases dramatically from the traditional 62% to 91%, and light utilization rate increases by nearly 50%; uniformity increases from 78% to 88%, significantly optimizing the brightness consistency of the displayed image and effectively solving the pain point of uneven brightness in traditional modules. The reverse prism structure not only improves luminous efficacy and uniformity but also provides privacy protection. Its special optical structure limits the propagation angle of light, ensuring a clear image is only visible within a certain viewing angle from the front, while effectively blocking light from side views, thus achieving natural privacy protection without the need for an additional privacy film, simplifying the product structure.

[0043] The collimated backlight display module structure of this invention is thinner and lighter. Through the integrated replacement of film materials, the overall thickness of the product is reduced by 0.1~0.2mm and the weight is reduced by 10~15g.

[0044] After passing through the LGP's special pattern, the light emitted from the LED surface has a high degree of convergence and concentration, significantly increasing the luminous efficacy from 62% to 91%, thereby reducing product power consumption.

[0045] After passing through the LGP's special pattern, the light emitted from the LED surface has a high degree of convergence and concentration. When combined with a reverse prism, it can narrow the light in the vertical direction, thus achieving a privacy function.

Claims

1. A collimated backlight display module LGP dot microstructure, characterized in that: The LGP dot microstructure consists of horseshoe-shaped dots (13) on the reflective surface of the light guide film (1) and a reverse prism film (7) attached to the light emitting surface of the light guide film (1).

2. The collimated backlight display module LGP dot microstructure according to claim 1, characterized in that: The horseshoe-shaped dots (13) have a concave structure.

3. The collimated backlight display module LGP dot microstructure according to claim 1, characterized in that: The horseshoe-shaped dots (13) are approximately isosceles triangles, with the base facing the light-incident surface of the light guide film (1). The two sides are respectively arc-shaped protruding outwards, with the base flush with the bottom surface of the light guide film (1). The recess becomes deeper towards the apex, forming a horseshoe shape facing the light-incident surface of the light guide film (1). Inclined plane.

4. The collimated backlight display module LGP dot microstructure according to claim 3, characterized in that: The angle between the inclined plane and the bottom surface of the light guide film (1) is defined as the light-facing angle θ, where 30° < light-facing angle θ < 45°.

5. The collimated backlight display module LGP dot microstructure according to claim 3, characterized in that: The horseshoe-shaped dots (13) have a bottom edge length of 30μm~80μm, preferably 55μm, and a distance between the bottom edge and the top corner of 40μm~85μm, preferably 62.5μm.

6. The collimated backlight display module LGP dot microstructure according to claim 1, characterized in that: The horseshoe-shaped dots (13) are distributed in a matrix on the light guide film (1). The distance between the center points of adjacent horseshoe-shaped dots (13) is X in the direction perpendicular to the light incident surface of the light guide film (1). The distance between the center points of adjacent horseshoe-shaped dots (13) is Y in the direction parallel to the light incident surface of the light guide film (1). The value of X gradually decreases from the light incident side to the tail, and the value of Y decreases at equal intervals or with local fine-tuning.

7. The collimated backlight display module LGP dot microstructure according to claim 1, characterized in that: The prism of the reverse prism film (7) faces the light guide film (1) to the side.

8. A backlight display module, characterized in that: The backlight display module includes a light guide film (1) with a dot microstructure as described in any one of claims 1 to 7, an LED lamp (2), a reverse prism film (7), and an upper diffuser film (6). The LED lamp (2) is disposed at the light-incident surface of the light guide film (1), the reverse prism film (7) is attached to the light-outceasing surface of the light guide film (1), and the upper diffuser film (6) is disposed above the reverse prism film (7).

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