Optical function board

Abstract

The optical function plate comprises an optical film and a diffusion plate, the optical film is arranged above the diffusion plate, the upper surface of the diffusion plate is provided with a microstructure sequence, the microstructure sequence is divided into a first sequence S1 and a second sequence S2, the microstructure of the first sequence S1 is different from the microstructure of the second sequence S2, the central brightness loss is small, and the brightness of the optical function plate is uniform. And the requirements of the two layers in the use of the backlight module can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of optical function plates, in particular to an optical function plate used in a backlight module structure. Background Art

[0002] In a direct-type backlight module, a diffuser plate and an optical film are the main optical components. In the existing backlight module design, the optical film and the diffuser plate need to be cut and assembled separately, and the steps are relatively cumbersome. If different optical films are involved, multiple cutting and assembly are required, which seriously affects the production efficiency. Therefore, an optical functional plate is proposed, which can combine the optical film and the diffuser plate into one, which can reduce the number of cutting times and assembly time, and greatly improve efficiency.

[0003] CN202123301268.3 discloses an optical functional plate used in a backlight module structure, relating to the technical field of optical functional plates, comprising: an optical plate body, one side of the optical plate body is provided with an eye protection structure, the other side of the optical plate body is provided with a fire-resistant heat dissipation structure, both sides of the optical plate body are provided with a reinforcement layer, the eye protection structure comprises a first protective plate and a second protective plate, the first protective plate is fixedly connected to the second protective plate, and the first protective plate is fixedly connected to one side of the optical plate body.

[0004] CN201620695847.0 discloses an optical functional plate, comprising: a first substrate layer, which is a thin layer made of single plastic particles and has good light transmittance; a second substrate layer, which is arranged below the first substrate layer and has good blemish concealing properties; the first substrate layer and the second substrate layer are co-extruded through an in-mold device, the thickness of the first substrate layer is greater than that of the second substrate layer, a non-smooth structure is formed on the upper surface of the first substrate layer, and the lower surface of the second substrate layer is a non-smooth plane.

[0005] CN201610519727.X An optical functional plate used in a backlight module structure, which is composed of a first substrate layer alone or a first substrate layer combined with a second substrate layer; the first substrate layer includes: a main layer and at least one functional layer; the main layer and the functional layer are co-extruded in an extruder mold, and a protruding structure is provided on the upper surface and / or lower surface of the first substrate layer, so that the upper surface and / or lower surface of the first substrate layer are non-smooth surfaces; the second substrate layer is bonded to the surface of the first substrate layer by UV glue.

[0006] The products on the market that combine optical film and diffuser have the following problems: 1. The center brightness loss is large. Compared with before lamination, due to the lack of air layer between the optical film and diffuser, the reflected light from the interface cannot be recycled, and the center brightness loss of the product after lamination is large; 2. The peeling force between the optical film and the diffuser is low.

[0007] In order to reduce the loss, microstructures are usually made on the surface of the diffuser to increase the air layer. However, the change from surface bonding to line bonding results in a reduction in the bonding surface, which greatly affects the peeling force between the optical film and the diffuser, often leading to delamination during cutting. Therefore, the center brightness and the brightness cannot be taken into account at the same time, which limits the use of the product. Summary of the invention

[0008] In order to solve the technical problem that the center brightness loss and the peeling force cannot be taken into account at the same time, the utility model provides an optical functional plate, which reduces the center brightness loss and avoids the generation of the peeling force problem.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0010] The utility model provides an optical functional plate, which comprises an optical film and a diffusion plate, wherein the optical film is placed above the diffusion plate, and a microstructure sequence is arranged on the upper surface of the diffusion plate, wherein the microstructure sequence is divided into a first sequence S1 and a second sequence S2, wherein the first sequence S1 is arranged in a middle position area, and the second sequence S2 is arranged in an edge area of ​​the diffusion plate sheet; the microstructure of the first sequence S1 is different from the microstructure of the second sequence S2.

[0011] Furthermore, the cross-section of the microstructure of the first sequence S1 is an isosceles right triangle, and has at least two structural heights, designed as a high-N-low structure, the number of structures with relatively low heights N≥5, the high structure height is H1, the low structure height is H2, H2≤H1, the structural spacing between the high and low structures is P1, and the spacing between adjacent low structures is P2; the second sequence S2 has an isosceles trapezoidal cross-section, and its structural height H3 is the same.

[0012] Furthermore, the number N of structures with relatively low heights in the first sequence is ≥6, or 7, 10, 15, or 20.

[0013] Furthermore, H1 of the first sequence is 50-300 μm, or 75 μm, 100 μm, 125 μm, 150 μm, 175 μm, 200 μm, 225 μm, or 250 μm.

[0014] Furthermore, H2 of the first sequence is 15~300μm, or 20μm, 25μm, 50μm, 100μm, 150μm, 175μm, 200μm, 225μm.

[0015] Furthermore, P1 of the first sequence is 65~600μm, or 95μm, 125μm, 150μm, 175μm, 200μm, 225μm, 300μm, 450μm, 500μm, 550μm.

[0016] Furthermore, P2 of the first sequence is 30~600μm, or 45μm, 50μm, 75μm, 100μm, 125μm, 150μm, 200μm, 250μm, 300μm, 420μm, 500μm.

[0017] Furthermore, H3 of the second sequence is 15~300μm, or 20μm, 25μm, 50μm, 100μm, 150μm, 175μm, 200μm, 225μm.

[0018] Furthermore, a spacing between the second sequence and the first sequence is P3, and P3 is 65-600 μm, or 95 μm, 125 μm, 150 μm, 175 μm, 200 μm, 225 μm, 300 μm, 450 μm, 500 μm, or 550 μm.

[0019] Furthermore, the height H3 is the same as the relatively tall structure height in the first sequence.

[0020] Furthermore, a spacing P4 between symmetry centers of two adjacent structures of the second sequence is 100-500 μm, or 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, or 450 μm.

[0021] Furthermore, the length L2 of the lower base of the isosceles trapezoid of the second sequence is 150-300 μm, or 180 μm, 200 μm, 230 μm, 250 μm, 260 μm, 280 μm, or 290 μm.

[0022] Furthermore, the upper base length L1 of the isosceles trapezoid of the second sequence is 20-200 μm, or 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 180 μm, or 190 μm.

[0023] Furthermore, the optical film is an optical film with optical gain, including one of a diffusion film, a prism film, an optical composite film, a wide-viewing angle film, an anti-glare film, and an anti-blue light film.

[0024] Compared with the prior art, the product provided by the utility model has the following advantages or functions: small central brightness loss and no delamination when cut, which can take into account the requirements of both in the use of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of an optical functional plate; 101 is an optical film, 102 is a microstructure sequence, and 103 is a diffuser plate body.

[0026] Figure 2is a diffuser plate diagram with microstructure sequences; S1 is the first sequence of diffuser plate microstructures, and S2 is the second sequence of diffuser plate microstructures.

[0027] Figure 3 Schematic diagram of the structure of the microstructure sequence. DETAILED DESCRIPTION

[0028] In order to make it easier to understand the structure of the present invention and the functional features and advantages that can be achieved, the preferred embodiments of the present invention are described in detail with reference to the drawings as follows:

[0029] Example

[0030] like Figure 1 As shown, an optical functional plate is composed of an optical film and a diffusion plate, wherein the upper surface of the diffusion plate is provided with a microstructure sequence.

[0031] The optical film may be one of commercially available optical films with optical gain, preferably one of a diffusion film and a prism film.

[0032] The diffuser is divided into two parts: the diffuser body and the microstructure sequence. The diffuser is formed by mixing plastic particles, diffuser particles, anti-aging particles, etc. in proportion and extruding. The plastic particles are generally polymers or copolymers such as polymethyl methacrylate (PMMA), polystyrene (PS), polycarbonate (PC), methyl methacrylate-styrene copolymer (MS), polyethylene terephthalate (PET), and polypropylene (PP). The diffuser particles are generally composed of one or more of silicone microbeads, PBMA (polybutyl methacrylate) microbeads, melamine microbeads, titanium dioxide, zinc oxide, zirconium oxide, barium sulfate, and calcium carbonate. The anti-aging particles used are generally a variety of antioxidant organic substances.

[0033] The utility model provides an optical functional plate, which adopts the following process method, and the steps are as follows:

[0034] Mix the plastic particles, diffusion particles, anti-aging particles and other materials, put them into a granulator for granulation, and obtain particles of uniform size;

[0035] The particles are uniformly mixed with plastic particles in a specific ratio, and stirred for a specific time to obtain a mixed material;

[0036] The mixed materials are respectively put into an extruder to extrude the molten materials, and then pass through a roller engraved with a microstructure sequence, so that the required microstructure sequence is pressed out on the main body of the diffusion plate;

[0037] After the diffusion plate is pulled, it is cooled to be shaped, and then the membrane plate is attached.

[0038] Film lamination stage:

[0039] Method 1: UV adhesive is coated on the lower surface of the optical film, the optical film and the diffuser plate are pressed together, and cured by UV light to obtain a final product.

[0040] Method 2: Apply heat-curing glue on the lower surface of the optical film, press the optical film and the diffuser plate together, put them in a drying room, cure and shape them, and obtain the final product.

[0041] Method three: stick an optical double-sided adhesive (OCA) on the lower surface of the optical film, press the optical film and the diffuser plate together to obtain a final product.

[0042] Center brightness test method:

[0043] The optical functional board provided by this patent is cut into A4 size, placed in the backlight module, and its central brightness gain is tested using a CS-2000 luminance meter (manufacturer: Konica Minolta).

[0044] Edge peeling force test:

[0045] According to the national standard GB / T 2792-2014 "Test method for peel strength of adhesive tape", the 180° peel test method is adopted.

[0046] Example 1

[0047] The utility model provides an optical function plate, which is composed of an optical film and a diffusion plate. A microstructure sequence is arranged on the upper surface of the diffusion plate.

[0048] The microstructure sequence is divided into a first sequence S1 and a second sequence S2, wherein the first sequence S1 is arranged in the middle position area, and the second sequence S2 is arranged in the edge area of ​​the diffuser sheet. The microstructure cross section of the first sequence S1 is an isosceles right triangle, designed as a one-high-five-low structure, the height H1 of the high structure is 75μm, the height H2 of the low structure is 50μm, the structure spacing P1 between the high and low structures is 125μm, and the spacing P2 between adjacent low structures is 100μm; the second sequence S2 is an isosceles trapezoid with equal height in cross section, and its structure height H3 is 75μm; the spacing P3 between the second sequence and the first sequence is 162.5μm, and the spacing P4 between the symmetry centers of two adjacent structures in the second sequence is 225μm.

[0049] The optical film is an ordinary prism film (manufacturer: Ningbo Jizhi Technology Model P250ML).

[0050] Example 2

[0051] The utility model provides an optical function plate, which is composed of an optical film and a diffusion plate. A microstructure sequence is arranged on the upper surface of the diffusion plate.

[0052] The microstructure sequence is divided into a first sequence S1 and a second sequence S2. The first sequence S1 is set in the middle position area, and the second sequence S2 is set in the edge area of ​​the diffuser sheet. The microstructure cross section of the first sequence S1 is an isosceles right triangle, designed as a one-high-ten-low structure, the height H1 of the high structure is 75μm, the height H2 of the low structure is 50μm, the structure spacing P1 between the high and low structures is 125μm, and the spacing P2 between adjacent low structures is 100μm; the second sequence S2 is an isosceles trapezoid with equal height in cross section, and its structure height H3 is 75μm; the spacing P3 between the second sequence and the first sequence is 162.5μm, and the spacing P4 between the symmetry centers of two adjacent structures in the second sequence is 225μm;

[0053] The optical film is an ordinary prism film (manufacturer: Ningbo Jizhi Technology Model P250ML).

[0054] Example 3

[0055] The utility model provides an optical function plate, which is composed of an optical film and a diffusion plate. A microstructure sequence is arranged on the upper surface of the diffusion plate.

[0056] The microstructure sequence is divided into a first sequence S1 and a second sequence S2, wherein the first sequence S1 is arranged in the middle position area, and the second sequence S2 is arranged in the edge area of ​​the diffuser sheet. The microstructure cross section of the first sequence S1 is an isosceles right triangle, designed as a one-high-five-low structure, the height H1 of the high structure is 37.5μm, the height H2 of the low structure is 25μm, the structural spacing P1 of the high and low structures connected is 62.5μm, and the spacing P2 of the adjacent low structures is 50μm; the second sequence S2 is an isosceles trapezoid with equal height in cross section, and its structural height H3 is 37.5μm; the spacing P3 between the second sequence and the first sequence is 81.25μm, and the spacing P4 between the symmetry centers of two adjacent structures in the second sequence is 112.5μm;

[0057] The optical film is an ordinary prism film (manufacturer: Ningbo Jizhi Technology Model P250ML).

[0058] Example 4

[0059] The utility model provides an optical function plate, which is composed of an optical film and a diffusion plate. A microstructure sequence is arranged on the upper surface of the diffusion plate.

[0060] The microstructure sequence is divided into a first sequence S1 and a second sequence S2, the first sequence S1 is set in the middle position area, and the second sequence S2 is set in the edge area of ​​the diffuser sheet. The microstructure cross section of the first sequence S1 is an isosceles right triangle, designed as a one-high-five-low structure, the height H1 of the high structure is 74μm, the height H2 of the low structure is 50μm, the structure spacing P1 between the high and low structures is 125μm, and the spacing P2 between adjacent low structures is 100μm; the second sequence S2 is an isosceles trapezoid with equal height in cross section, and its structure height H3 is 86.88μm; the spacing P3 between the second sequence and the first sequence is 100μm, and the spacing P4 between the symmetry centers of two adjacent structures in the second sequence is 100μm.

[0061] The optical film is an ordinary prism film (manufacturer: Ningbo Jizhi Technology Model P250ML).

[0062] Comparative Example 1

[0063] The utility model provides an optical function plate, which is composed of an optical film and a diffusion plate. A microstructure sequence is arranged on the upper surface of the diffusion plate.

[0064] The microstructure sequence is a microprism structure, the cross section of the microprism structure is an isosceles triangle with equal height, the spacing between adjacent structures is 125 μm, and the microstructure height is 75 μm.

[0065] The optical film is an ordinary prism film (manufacturer: Ningbo Jizhi Technology Model P250ML).

[0066] Comparative Example 2

[0067] The utility model provides an optical function plate, which is composed of an optical film and a diffusion plate. No microstructure sequence is arranged on the upper surface of the diffusion film.

[0068] The optical film is an ordinary prism film (manufacturer: Ningbo Jizhi Technology Model P250ML).

[0069] Table 1 Example

[0070]

[0071] It can be concluded from the test results of the above embodiments 1 to 5 and comparative example 1 that the optical functional plate provided by the utility model has excellent edge peeling force and better center brightness gain than an optical functional plate with a micro-prism structure of the same height.

[0072] It can be concluded from the test results of the above-mentioned embodiments 1 to 5 and comparative example 2 that the optical functional plate without a microstructure sequence, although it has excellent edge peeling force, has a very serious loss of center brightness. The optical functional plate provided by the utility model has very good center brightness gain and relatively good peeling force, which can solve the problem of edge cutting and delamination.

[0073] The above is only a preferred embodiment of the utility model, and is not intended to limit the protection scope of the utility model. All equivalent changes and modifications made according to the content of the utility model are included in the patent scope of the utility model.

Claims

1. An optical functional plate, comprising an optical film and a diffuser, wherein the optical film is placed above the diffuser, and a microstructure sequence is arranged on the upper surface of the diffuser, wherein the microstructure sequence is divided into a first sequence S1 and a second sequence S2, wherein the first sequence S1 is arranged in the middle position area, and the second sequence S2 is arranged in the edge area of ​​the diffuser sheet; characterized in that: The microstructure of the first sequence S1 is different from the microstructure of the second sequence S2.

2. The optical functional plate according to claim 1, characterized in that: The cross-section of the microstructure of the first sequence S1 is an isosceles right triangle, and has at least two structural heights, designed as a high-N-low structure, the number of structures with relatively low heights N≥5, the high structure height is H1, the low structure height is H2, H2≤H1, the structural spacing between the high and low structures is P1, and the spacing between adjacent low structures is P2; the second sequence S2 has an isosceles trapezoidal cross-section, and its structural height H3 is the same.

3. The optical functional plate according to claim 2, characterized in that: The number N of relatively low height structures in the first sequence is ≥6, or 7, 10, 15, 20.

4. The optical functional plate according to claim 2, characterized in that: The H1 of the first sequence is 50 to 300 μm, or 75 μm, 100 μm, 125 μm, 150 μm, 175 μm, 200 μm, 225 μm, or 250 μm.

5. The optical functional plate according to claim 2, characterized in that: The H2 of the first sequence is 15 to 300 μm, or 20 μm, 25 μm, 50 μm, 100 μm, 150 μm, 175 μm, 200 μm, or 225 μm.

6. The optical functional plate according to claim 2, characterized in that: P1 of the first sequence is 65-600μm, or 95μm, 125μm, 150μm, 175μm, 200μm, 225μm, 300μm, 450μm, 500μm, 550μm.

7. The optical functional plate according to claim 2, characterized in that: P2 of the first sequence is 30-600μm, or 45μm, 50μm, 75μm, 100μm, 125μm, 150μm, 200μm, 250μm, 300μm, 420μm, 500μm.

8. The optical functional plate according to claim 2, characterized in that: The H3 of the second sequence is 15-300μm, or 20μm, 25μm, 50μm, 100μm, 150μm, 175μm, 200μm, 225μm.

9. The optical functional plate according to claim 1 or 2, characterized in that: The spacing between the second sequence and the first sequence is P3, and P3 is 65-600μm, or 95μm, 125μm, 150μm, 175μm, 200μm, 225μm, 300μm, 450μm, 500μm, or 550μm.

10. The optical functional plate according to claim 1 or 2, characterized in that: The distance P4 between the symmetry centers of two adjacent structures of the second sequence is 100-500 μm, or 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, or 450 μm.

11. The optical functional plate according to claim 2, characterized in that: The length L2 of the lower base of the isosceles trapezoid of the second sequence is 150-300 μm, or 180 μm, 200 μm, 230 μm, 250 μm, 260 μm, 280 μm, or 290 μm.

12. The optical functional plate according to claim 2, characterized in that: The upper base length L1 of the second sequence of isosceles trapezoids is 20 to 200 μm, or 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 180 μm, or 190 μm.

13. The optical functional plate according to claim 1 or 2, characterized in that: The optical film is an optical film with optical gain, including one of a diffusion film, a prism film, an optical composite film, a wide-viewing angle film, an anti-glare film, and an anti-blue light film.

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