Optical mask and display screen
By designing an optical mask with light-insulating substrate, light-transmitting substrate and optical coating, the problem of insufficient contrast improvement of black masks in the prior art is solved, and the contrast improvement of LED display screens and the consistency of black screens is improved, and users are enhanced. Experience.
Patent Information
- Application Number
- CN202323601795.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-27
AI Technical Summary
The existing black masks have limited improvement in contrast to LED displays, and cannot effectively improve the consistency and display effect of black screens.
An optical mask is designed, including a mask body and an optical coating. The mask body has a light-discreting substrate and a light-transmitting substrate, a avoidance hole is provided to avoid lamp beads, and a second surface is covered with anti-reflection and anti-glare layer to reduce reflection. Light and specular reflection to improve contrast.
Through the use of optical masks, the contrast and black screen consistency of the display module are significantly improved, and the user's viewing experience is enhanced.
Smart Images
Figure CN222300250U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of display screens, and in particular relates to an optical mask and a display screen. Background Art
[0002] LED display screens have the characteristics of high brightness, bright colors, high luminous efficiency, high contrast, short response time, wide operating temperature range and low energy consumption. They are widely used in stage display equipment, advertising display equipment, data visualization display equipment and commercial display equipment.
[0003] Structurally, the LED display screen is first composed of several independent LED lamp beads installed on the PCB in the form of PCB circuit connection to form a light board. Multiple light boards form a display panel, and then multiple display panels are spliced into independent boxes. Finally, multiple independent boxes are used to splice into the final complete screen. This special structure enables the LED display screen to have the significant advantages of flexible application in a variety of usage scenarios and high display integrity.
[0004] However, while having this advantage, this functional structure will also lead to other negative problems, such as the black screen modularization problem of LED display screens. The color difference of ink on the PCB between the light boards is the key factor leading to the black screen modularization problem. The current common solution in the industry is to install a black mask made by injection molding on the light board to cover the base color on the PCB. Because the black mask can open holes at the position of the lamp beads, it can effectively improve the black screen consistency of the screen without affecting the light output of the lamp beads. However, in addition to improving the black screen consistency, this black mask has no improvement or little improvement on the contrast of the LED display. Utility Model Content
[0005] The utility model aims to provide an optical mask and a display screen, aiming to solve the technical problem that the existing black mask has no improvement or only little improvement on the contrast of the display screen.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0007] In a first aspect, an optical mask is provided, which is arranged on a lamp board, wherein the lamp board includes a circuit board and lamp beads arranged on the circuit board, and the optical mask includes a mask body and an optical coating;
[0008] The mask body has a first surface and a second surface facing each other, and one side of the mask body along the direction from the first surface to the second surface includes a light-isolating substrate for shielding the circuit board and a light-transmitting substrate for transmitting light, and the mask body is provided with at least one avoidance hole on the first surface, and the avoidance hole at least passes through the light-isolating substrate, and each of the avoidance holes is used to avoid at least one of the lamp beads, and the first surface is used to abut against a side of the lamp board provided with the lamp beads;
[0009] An optical coating is coated on the second surface, and the optical coating includes an anti-reflection layer for reducing reflected light formed in the mask body by the light emitted by the lamp beads.
[0010] In one embodiment of the first aspect, a plurality of the avoidance holes are provided, and the plurality of the avoidance holes are arranged in an array, and each of the avoidance holes is used to accommodate one of the lamp beads.
[0011] In one embodiment of the first aspect, the light-isolating substrate is black, and the light-transmitting substrate is transparent.
[0012] In one embodiment of the first aspect, the optical coating further comprises an anti-glare layer for reducing specular reflection of the mask body.
[0013] In one embodiment of the first aspect, the anti-glare layer is located between the anti-reflection layer and the mask body.
[0014] In one embodiment of the first aspect, the haze of the anti-glare layer is 60%-90%.
[0015] In one embodiment of the first aspect, the avoidance hole is a blind hole.
[0016] In one embodiment of the first aspect, the depth of the avoidance hole is greater than the height of the lamp bead.
[0017] In one embodiment of the first aspect, the avoidance hole passes through the light-transmitting substrate.
[0018] In a second aspect, a display screen is provided, comprising the optical mask as described in the above embodiments.
[0019] The technical effect of the utility model relative to the prior art is that when the optical mask is in use, it can be directly covered on the lamp board to form a part of the lamp board package, and the optical mask and the lamp board together form a display module, wherein the first surface of the mask body is attached to the mounting surface of the circuit board, and the avoidance hole avoids the lamp beads, so that the lamp beads are located in the avoidance hole. At this time, the light-isolating substrate of the mask body can block the pattern or element on the circuit board, and the light-transmitting substrate can be used to assist the anti-reflection layer to reduce or eliminate the reflected light on the optical surface of the mask body. The optical mask reduces the brightness of the corresponding area of the light-isolating substrate by setting the anti-reflection layer, thereby improving the contrast of the display module. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 is a cross-sectional view of a display screen provided by an embodiment of the utility model;
[0022] Figure 2 It is a bottom view of the optical mask provided by an embodiment of the utility model;
[0023] Figure 3 is a cross-sectional view of an optical mask provided by one embodiment of the utility model;
[0024] Figure 4 It is a side view of the injection mold provided by the embodiment of the utility model;
[0025] Figure 5 is a cross-sectional view of an optical mask provided by another embodiment of the present utility model;
[0026] Description of reference numerals:
[0027] 100, optical mask; 10, mask body; 11, light-isolating substrate; 12, light-transmitting substrate; 101, first surface; 102, second surface; 103, avoidance hole; 20, optical coating; 21, anti-reflection layer; 22, anti-glare layer; 80, light board; 81, circuit board; 82, lamp beads; 801, mounting surface; 90, injection mold; 91, bottom plate; 92, boss; 901, injection molding area. DETAILED DESCRIPTION
[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0029] In the description of the present invention, it is necessary to understand that the terms "height", "thickness", "up", "down", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] See also Figure 1 The embodiment of the utility model provides an optical mask 100, which can be covered on a light board 80, and the light board 80 includes a circuit board 81 and lamp beads 82 arranged on the circuit board 81, wherein the circuit board 81 has a mounting surface 801, and the lamp beads 82 are mounted on the mounting surface 801, and the optical mask 100 and the light board 80 can form a display screen together. In this embodiment, the lamp beads 82 can be LED lamp beads 82.
[0034] Please combine Figure 2 and Figure 3 The optical mask 100 includes a mask body 10 and an optical coating 20 .
[0035] The mask body 10 has a first surface 101 and a second surface 102 facing each other. The mask body 10 includes a light-isolating substrate 11 for shielding the circuit board 81 and a light-transmitting substrate 12 for transmitting light on one side of the direction from the first surface 101 to the second surface 102. The mask body 10 has at least one avoidance hole 103 on the first surface 101. The avoidance hole 103 at least passes through the light-isolating substrate 11. Each avoidance hole 103 is used to avoid at least one lamp bead 82. The first surface 101 is used to abut against the side of the lamp board 80 where the lamp bead 82 is provided. The cross-sectional shape of the avoidance hole 103 is not limited here. In the illustrated embodiment, the cross-sectional shape of the avoidance hole 103 is square. In other embodiments, the cross-sectional shape of the avoidance hole 103 can be circular, other polygonal, etc., and can be specifically set according to needs and the shape of the lamp bead 82.
[0036] The material of the mask body 10 can be thermoplastic resins such as polyamide (refractive index 1.53), polyphenylene sulfide (refractive index 1.64), polyethylene (refractive index 1.5), polypropylene (refractive index 1.49), polyvinyl chloride (refractive index 1.54), polybutylene terephthalate (refractive index 1.58), ethylene-acetic acid copolymer (refractive index 1.50-1.51) and thermosetting resins such as epoxy resin (refractive index 1.55-1.59) and phenolic resin (refractive index 1.5-1.6). The material of the light-isolating substrate 11 and the light-transmitting substrate 12 can be the same or different, and there is no limitation here.
[0037] The optical coating 20 is coated on the second surface 102, and the optical coating 20 includes an anti-reflection layer 21 for reducing the reflected light formed in the mask body 10 by the light emitted by the lamp beads 82. The anti-reflection layer 21 can be an anti-reflection film, and its main function is to reduce or eliminate the reflected light on the optical surface of the mask body 10, thereby increasing the light transmittance of the light-transmitting substrate 12 and reducing or eliminating the stray light in the light-transmitting substrate 12. Among them, the anti-reflection layer 21 can be directly formed on the second surface 102, and can also be formed on other coatings, which is not limited here.
[0038] The anti-reflection layer 21 can be attached to the second surface 102 by magnetron sputtering, sol-gel method or vapor deposition, and the material can be an anti-reflection material with a refractive index between the mask body 10 and air, such as magnesium fluoride, silicon dioxide, magnesium silicate, etc. The thickness of a single layer of the anti-reflection layer 21 can be selected to be 100-200nm, and the number of layers is 1-7 layers. The lower the light reflectivity of the anti-reflection layer 21, the better the effect of reducing reflection. In this embodiment, the overall visible light reflectivity of the anti-reflection layer 21 is less than 2%.
[0039] When in use, the optical mask 100 can be directly covered on the light board 80 to form a part of the light board 80 package. The optical mask 100 and the light board 80 together form a display module, wherein the first surface 101 of the mask body 10 is attached to the mounting surface 801 of the circuit board 81, and the avoidance hole 103 avoids the lamp beads 82, so that the lamp beads 82 are located in the avoidance hole 103. At this time, the light-isolating substrate 11 of the mask body 10 can block the pattern or element on the circuit board 81, and the light-transmitting substrate 12 can be used to assist the anti-reflection layer 21 to reduce or eliminate the reflected light on the optical surface of the mask body 10. The optical mask 100 reduces the brightness of the corresponding area of the light-isolating substrate 11 by setting the anti-reflection layer 21, thereby improving the contrast of the display module.
[0040] Optionally, the light transmittance of the light-isolating substrate 11 is less than 5% so as to shield the patterns or elements on the light board 80 , wherein the light-isolating substrate 11 can be doped with a colorant to reduce the light transmittance.
[0041] As one of the implementation modes, black colorant may be doped into the light-isolating substrate 11 . In this case, the light-isolating substrate 11 is black. In this case, the light-isolating substrate 11 can absorb light of various colors, thereby improving the black screen consistency of the light board 80 .
[0042] Optionally, the light transmittance of the transparent substrate 12 is greater than 85%, so as to assist the anti-reflection layer 21 in reducing the reflected light. The thickness of the transparent substrate 12 is between 50um and 200um.
[0043] As one implementation manner, the light-transmitting substrate 12 is not doped with any colorant, and the light-transmitting substrate 12 is transparent to improve the transmittance of light.
[0044] In some embodiments, see Figure 2 and Figure 3 The avoidance holes 103 are provided with a plurality of avoidance holes 103 arranged in an array, and each avoidance hole 103 is used to accommodate a lamp bead 82. Only one lamp bead 82 is arranged in one avoidance hole 103 to improve the black screen consistency of the display module. The avoidance holes 103 are arranged in an array in a manner that is compatible with the array arrangement of the lamp bead 82 on the circuit board 81. The depth of the avoidance holes 103 is greater than or equal to the height of the lamp bead 82.
[0045] In some embodiments, see Figure 2 and Figure 3 The optical coating 20 also includes an anti-glare layer 22 for reducing the specular reflection of the mask body 10. The anti-glare layer 22 reduces the reflection of the optical mask to the ambient light, effectively reduces the impact of glare on vision, and improves the viewing experience of the user.
[0046] Among them, the anti-glare layer 22 can be prepared by etching, spraying, rolling, coating or phase separation. In this embodiment, the anti-glare layer 22 can be prepared by a phase separation process. The anti-glare layer 22 prepared by this process has a fine surface, uniform particles, and better anti-reflection effect.
[0047] Optionally, the anti-glare layer 22 may have a thickness of 0-15 um and a haze value of 0-90%. When the haze value of the anti-glare layer 22 is 0, the anti-glare layer 22 may be used as a part of the transparent substrate 12, which is equivalent to the optical coating 20 having only the anti-reflection layer 21.
[0048] Furthermore, the haze of the anti-glare layer is 60%-90% to improve the anti-glare effect. The light reflectivity of the anti-glare layer 22 may be less than 0.2% to improve the anti-glare effect.
[0049] Optional, see Figure 3The anti-glare layer 22 is formed on the second surface 102. At this time, the anti-glare layer 22 is located between the anti-reflection layer 21 and the mask body 10. In this way, the anti-glare layer 22 can also assist the anti-reflection layer 21 to a certain extent to improve the effect of reducing reflection.
[0050] In some embodiments, see Figure 3 The avoidance hole 103 is a blind hole, that is, the avoidance hole 103 is through to the second surface 102. In this case, the avoidance hole 103 is in a groove shape, and the avoidance hole 103 can be only opened on the light-isolating substrate 11, or can extend to the light-transmitting substrate 12, which is not limited here. Figure 1 When the optical cover 100 is covered on the lamp board 80, the optical cover 100 and the circuit board 81 together form a plurality of accommodating cavities formed with avoidance holes 103, and the lamp beads 82 are located in the accommodating cavities. The optical coating 20 covers the second surface 102, so the optical coating 20 can be located directly above the lamp beads 82 to improve the effect of reducing reflection, thereby further improving the contrast of the display module.
[0051] Optional, see Figure 1 , the depth of the avoidance hole 103 is greater than the height of the lamp bead 82, so that a certain distance can be spaced between the light-transmitting substrate 12 and the lamp bead 82, so as to improve the reflection reduction effect of the anti-reflection layer 21 through the air between the light-transmitting substrate 12 and the lamp bead 82. In practical applications, the depth of the avoidance hole 103 can also be set according to the height of the lamp bead 82 on the lamp board 80. In this embodiment, the depth of the avoidance hole 103 can be 110%-150% of the height of the lamp bead 82.
[0052] In this embodiment, the method for preparing the optical mask 100 includes:
[0053] S1, opening the injection mold 90 (such as Figure 4 ), the injection mold 90 includes a bottom plate 91 and a convex column 92 protruding from the bottom plate 91, and the area on the bottom plate 91 where the convex column 92 is not provided forms an injection area 901 of the injection mold 90, wherein the height of the convex column 92 is 110%-150% of the height of the lamp bead 82;
[0054] S2, spraying a release agent on the injection mold 90;
[0055] S3, injecting the injection material for forming the light-isolating substrate 11 into the injection area 901 in the injection mold 90, wherein the injection thickness is equal to the height of the convex column 92;
[0056] S4, thermally curing the light-isolating substrate 11, but not leaving the mold;
[0057] S5. Injecting a molding material for forming a light-transmitting substrate 12 onto the solidified light-isolating substrate 11 in the injection mold 90. The molding material of the light-transmitting substrate 12 covers the light-isolating substrate 11 and the convex pillars 92. The thickness of the injection molding of the light-transmitting substrate 12 is 50-200 um.
[0058] S6, thermally curing the light-transmitting substrate 12, and then separating the injection-molded light-isolating substrate 11 from the light-transmitting substrate 12 to complete the preparation of the mask body 10;
[0059] S7, preparing an anti-glare layer 22, the anti-glare layer 22 can be prepared by etching, spraying, rolling, coating or phase separation, among which the phase separation process is preferred, and the thickness of the anti-glare layer 22 is 0-15 μm;
[0060] S8. Prepare an anti-reflection layer 21 on the anti-glare layer 22. The anti-reflection layer 21 can be prepared by magnetron sputtering, sol-gel method or vapor deposition, and the material is an anti-reflection material with a refractive index between 1 and 1.6, such as magnesium fluoride, silicon dioxide, and magnesium silicate. The single layer thickness of the anti-reflection layer 21 is 100-200 nm, the number of layers is 1-7, and the overall visible light reflectivity is less than 2%;
[0061] S9, complete the preparation.
[0062] In some embodiments, see Figure 5 The avoidance hole 103 passes through the transparent substrate 12, and the avoidance hole 103 is a through hole. When the optical cover 100 is assembled with the light board 80, there is no shielding above the lamp beads 82, so the optical cover 100 reduces the light loss of the lamp beads 82 compared with the above embodiment, and the preparation method is simpler.
[0063] The height of the light-isolating substrate 11 is less than the height of the lamp bead 82 and greater than 95% of the height of the lamp bead 82 , and the thickness of the light-transmitting substrate 12 is 50-200 um.
[0064] In this embodiment, the method for preparing the optical mask 100 includes:
[0065] S1, opening the injection mold 90 (such as Figure 4 ), the injection mold 90 includes a bottom plate 91 and a convex column 92 convexly disposed on the bottom plate 91, and the area on the bottom plate 91 where the convex column 92 is not disposed forms an injection area 901 of the injection mold 90, wherein the height of the convex column 92 may be greater than the height of the lamp bead 82;
[0066] S2, spraying a release agent on the injection mold 90;
[0067] S3, injecting the injection material for forming the light-transmitting substrate 12 into the injection area 901 in the injection mold 90, with the injection thickness being 50-200 um;
[0068] S4, thermally curing the light-transmitting substrate 12, but not leaving the mold;
[0069] S5, injecting the injection material for forming the light-isolating substrate 11 above the solidified light-transmitting substrate 12 in the injection mold 90, wherein the injection thickness is less than the height of the lamp bead 82 and greater than 95% of the height of the lamp bead 82;
[0070] S6, thermally curing the light-isolating substrate 11, and then separating the molded light-isolating substrate 11 and the light-transmitting substrate 12, thereby completing the preparation of the mask body 10;
[0071] S7, preparing an anti-glare layer 22, the anti-glare layer 22 can be prepared by etching, spraying, rolling, coating or phase separation, among which the phase separation process is preferred, and the thickness of the anti-glare layer 22 is 0-15 μm;
[0072] S8. Prepare an anti-reflection layer 21 on the anti-glare layer 22. The anti-reflection layer 21 can be prepared by magnetron sputtering, sol-gel method or vapor deposition, and the material is an anti-reflection material with a refractive index between 1 and 1.6, such as magnesium fluoride, silicon dioxide, and magnesium silicate. The single layer thickness of the anti-reflection layer 21 is 100-200 nm, the number of layers is 1-7, and the overall visible light reflectivity is less than 2%;
[0073] S9, complete the preparation.
[0074] In other embodiments, when preparing the optical mask 100 , the light-isolating substrate 11 may be prepared first, and then the light-transmitting substrate 12 may be prepared, and then the optical coating 20 may be prepared after film separation, which is not limited here.
[0075] The present invention also provides a display screen, including the optical mask 100 provided in the above embodiments. The optical mask 100 has the same structural features and functions as the optical masks 100 in the above embodiments, which will not be described in detail here.
[0076] The above description is only a preferred embodiment of the utility model, and only specifically describes the technical principle of the utility model. These descriptions are only for explaining the principle of the utility model and cannot be interpreted as limiting the protection scope of the utility model in any way. Based on the explanation here, any modification, equivalent replacement and improvement made within the spirit and principle of the utility model, and other specific implementation methods of the utility model that can be associated with the technicians in this field without creative labor, should be included in the protection scope of the utility model.
Claims
1. An optical mask, which is mounted on a lamp board, wherein the lamp board comprises a circuit board and lamp beads arranged on the circuit board, characterized in that: The optical mask comprises: A mask body, comprising a first surface and a second surface facing each other, wherein one side of the mask body along the direction from the first surface to the second surface comprises a light-isolating substrate for shielding the circuit board and a light-transmitting substrate for transmitting light, the mask body is provided with at least one avoidance hole on the first surface, the avoidance hole at least passes through the light-isolating substrate, each avoidance hole is used to avoid at least one lamp bead, and the first surface is used to abut against a side of the lamp board provided with the lamp bead; An optical coating is coated on the second surface, wherein the optical coating comprises an anti-reflection layer for reducing reflected light formed in the mask body by the light emitted by the lamp beads.
2. The optical mask according to claim 1, wherein: There are a plurality of the avoidance holes, which are arranged in an array, and each of the avoidance holes is used to accommodate a lamp bead.
3. The optical mask according to claim 1, wherein: The light-isolating substrate is black, and the light-transmitting substrate is transparent.
4. The optical mask according to claim 1, wherein: The optical coating also includes an anti-glare layer for reducing specular reflection of the mask body.
5. The optical mask according to claim 4, characterized in that: The anti-glare layer is located between the anti-reflection layer and the mask body.
6. The optical mask according to claim 4, characterized in that: The haze of the anti-glare layer is 60%-90%.
7. The optical mask according to any one of claims 1 to 6, characterized in that: The avoidance hole is a blind hole.
8. The optical mask according to claim 7, wherein: The depth of the avoidance hole is greater than the height of the lamp bead.
9. The optical mask according to any one of claims 1 to 6, characterized in that: The avoidance hole passes through the light-transmitting substrate.
10. A display screen, characterized in that: Comprising the optical mask according to any one of claims 1 to 9.