CN114089562B - Diffusion plate, preparation method, backlight module and display device - Google Patents
Diffusion plate, preparation method, backlight module and display device Download PDFInfo
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- CN114089562B CN114089562B CN202111354601.9A CN202111354601A CN114089562B CN 114089562 B CN114089562 B CN 114089562B CN 202111354601 A CN202111354601 A CN 202111354601A CN 114089562 B CN114089562 B CN 114089562B
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 238000005282 brightening Methods 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000010408 film Substances 0.000 description 82
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 240000004282 Grewia occidentalis Species 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a diffusion plate, a preparation method, a backlight module and a display device, wherein the diffusion plate comprises the following components: a diffusion plate body; the brightness enhancement film is arranged in a dark light area of the diffusion plate body, the brightness enhancement film is used for adjusting part of light rays in a bright light area of the diffusion plate body to the dark light area, the dark light area is an area where a light source irradiates the diffusion plate body and the brightness value is smaller than a preset threshold value, and the bright light area is an area where the light source irradiates the diffusion plate body and the brightness value is larger than or equal to the preset threshold value. The invention can solve the technical problem that the direct type backlight module in the prior art has brighter central area and darker periphery, thereby causing the display of the direct type television to appear in four corners.
Description
Technical Field
The invention relates to the technical field of display, in particular to a diffusion plate, a preparation method, a backlight module and a display device.
Background
The liquid crystal display has many advantages such as power saving, no radiation, etc., and has been widely used, and it specifically includes a display panel and a backlight module. Since the display panel does not emit light, the backlight module is required to provide a light source for displaying images normally, so that the backlight module forms one of the key components in the liquid crystal display.
Currently, in a backlight module using light emitting diodes (LIGHT EMITTING diode, LEDs) as a backlight source, the LEDs of the direct type backlight module are arranged in a matrix manner, so that the arrangement tends to result in stronger brightness in the central area of the module, darker brightness around, and overlapping at four corners, so that shadows appear at four corners when the direct type television is displayed.
Disclosure of Invention
The embodiment of the invention solves the technical problem that the direct type backlight module in the prior art has brighter central area and darker periphery, so that the direct type television display has four-corner shadows.
In one aspect, the present invention provides a diffusion plate according to an embodiment of the present invention, the diffusion plate comprising:
A diffusion plate body;
The brightness enhancement film is arranged in a dark light area of the diffusion plate body, the brightness enhancement film is used for adjusting part of light rays in a bright light area of the diffusion plate body to the dark light area, the dark light area is an area where a light source irradiates the diffusion plate body and the brightness value is smaller than a preset threshold value, and the bright light area is an area where the light source irradiates the diffusion plate body and the brightness value is larger than or equal to the preset threshold value.
Optionally, the brightness enhancement film includes a prism surface having a plurality of prism structures, and the prism surface is attached to the lower surface of the diffusion plate body near the light source.
Optionally, the dark light area is an edge area near an edge line of the diffusion plate body, and a white area is reserved between the brightness enhancement film and the edge line.
Optionally, the width of the blank area is smaller than the width of the brightness enhancement film.
Optionally, the length direction of the brightness enhancement film is parallel to the edge line.
Optionally, the length direction of the brightness enhancement film and the edge line form an included angle, and the included angle between the length direction and the edge line is smaller than a preset included angle.
Optionally, when the number of the dark light areas is plural, and the edge lines corresponding to the dark light areas have an abutting relationship, two brightness enhancement films corresponding to two adjacent edge lines are attached to each other.
Optionally, the width of the brightness enhancement film is greater than the width of the dark light region.
Optionally, the brightness enhancement film and the dark light region are the same in shape and size.
In another aspect, the present invention provides a method for preparing a diffusion plate according to an embodiment of the present invention, the method comprising:
providing a diffusion plate body and a brightening membrane, wherein the diffusion plate body comprises a bright light area and a dark light area;
The brightness enhancement film is arranged in a dark light area of the diffusion plate body, so that the diffusion plate is obtained;
the brightness enhancement film is used for adjusting part of light rays in a bright area of the diffusion plate body to a dark area, the bright area is an area where a light source irradiates the diffusion plate body and the brightness value is larger than or equal to a preset threshold value, and the dark area is an area where the light source irradiates the diffusion plate body and the brightness value is smaller than the preset threshold value.
Optionally, the disposing the brightness enhancement film on the dark light region of the diffuser body, so as to obtain the diffuser includes:
at least treating the lower surface, close to the light source, of the diffusion plate body where the dark light area is located to be a rough surface;
And attaching the brightening film to the rough surface so as to attach the brightening film to the dark light area of the diffusion plate body, thereby obtaining the diffusion plate.
In another aspect, the present invention provides a backlight module according to an embodiment of the present invention, wherein the backlight module includes the diffusion plate as described above.
In another aspect, the present invention provides a display device according to an embodiment of the present invention, where the display device includes the backlight module and a display panel stacked with the backlight module.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages: the present invention provides a diffusion plate comprising: the diffusion plate comprises a diffusion plate body and a brightening membrane, wherein the brightening membrane is arranged in a dark light area of the diffusion plate body, the brightening membrane is used for adjusting part of light rays in a bright light area of the diffusion plate body to the dark light area so as to improve the brightness value of the dark light area, the dark light area is an area where a light source irradiates the diffusion plate body and the brightness value is smaller than a preset threshold value, and the bright light area is an area where the light source irradiates the diffusion plate body and the brightness value is larger than or equal to the preset threshold value. In the above scheme, the brightness enhancement film is arranged on the dark light area of the diffusion plate body so as to adjust part of light rays in the bright light area of the diffusion plate body to the dark light area, so that the brightness intensity of the bright light area and the brightness intensity of the dark light area in the diffusion plate body are uniform and moderate, the technical problems that the central area of the direct type backlight module is strong in brightness, the periphery of the direct type backlight module is dark, shadows appear in four corners during display of the direct type television are solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a diffusion plate according to an embodiment of the present invention.
Fig. 2 and 3 are schematic structural views of two possible brightness enhancement films according to embodiments of the present invention.
FIG. 4 is a schematic illustration of one possible brightness enhancing film fit provided by an embodiment of the present invention.
Fig. 5 is a top view of a possible backlight module according to an embodiment of the invention.
Fig. 6 is a schematic structural diagram of another diffusion plate according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a backlight effect based on a diffusion plate according to an embodiment of the present invention.
Fig. 8 is a flow chart of a method for manufacturing a diffusion plate according to an embodiment of the invention.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
The applicant has also found in the course of proposing the present application that: due to the arrangement mode of LEDs in the direct type backlight module, bright edges, dark frames, dark corners and the like of the direct type television are always generated, and the phenomena can cause excessive uneven picture light rays and influence the appearance of a user. To solve these problems, the prior art generally adopts punching or silk-screening to adjust the distance between lamps, selects a reflective sheet with good diffuse reflection effect, reduces the transmittance of an optical film, and improves the concealing degree so as to alleviate these phenomena. However, these techniques are more likely to affect the display brightness of the television by sacrificing the total light quantity in the backlight module cavity to achieve the visual effect improvement.
In order to solve the above problems, the present invention provides a diffusion plate, a manufacturing method thereof, a backlight module and a display device. Fig. 1 is a schematic structural diagram of a diffusion plate according to an embodiment of the invention. The diffusion plate 10 as shown in fig. 1 includes: a diffusion plate body 100 and a brightness enhancement film 200. The diffusion plate body 100 includes a dark light area 101 and a bright light area 102, and the brightness enhancement film 200 is disposed on the dark light area 101 of the diffusion plate body 100, and is used for adjusting part of light in the bright light area 102 in the diffusion plate body 100 to the dark light area 101 so as to improve the brightness value of the dark light area 101 and reduce the brightness value of the bright light area 102, so that the dark light area 101 is not too dark and the bright light area 102 is not too bright, thereby ensuring uniformity of brightness of light in the diffusion plate 10.
In the present invention, the dark light area 101 refers to an area where the luminance value of the light source irradiated onto the diffuser plate body is smaller than a preset first threshold value, and the bright light area 102 refers to an area where the luminance value of the light source irradiated onto the diffuser plate body is greater than or equal to a preset second threshold value. In other words, the dark light region 101 refers to a region having a smaller luminance value when the diffusion plate body is irradiated with the light source, and the bright light region 102 refers to a region having a larger luminance value when the diffusion plate body is irradiated with the light source. The preset first threshold and the preset second threshold are both thresholds set by the system in a self-defining manner, for example, the thresholds may be set according to actual demands of the system, experience values set according to experience of a user, and the like, and the preset first threshold and the preset second threshold may be the same or different, so that the invention is not limited.
In practical applications, the shape and size of each of the dark light area 101 and the bright light area 102 are not limited by the present invention. For example, in an application scenario such as a direct type backlight module, the dark light area 101 may be a sector-shaped dark corner area located at four corners of the diffuser body 100, the bright light area 102 may be a central rectangular area located in the diffuser body 100, etc., which may be specifically determined according to practical situations, and the present invention is not limited thereto.
The brightness enhancement film 200 of the present invention, which may also be referred to as a prism film or a condensing film, is used to improve the brightness and uniformity of the light of the diffusion plate body 100, and may include, but is not limited to, a general prism sheet, a multifunctional prism sheet, a microlens film, a reflective polarizing brightness enhancement film, etc. The general prism sheet is used for adjusting part of light rays in the bright area 102 to the dark area 101 and guiding the light rays entering the dark area 101 so as to improve the brightness value of the dark area 101. The multifunctional prism sheet integrates the functions of the prism sheet and the diffusion sheet, and has better luminous efficiency than a common prism sheet. The microlens film sheet is obtained by integrating prism sheet and diffusion sheet functions into one film. The reflective polarizing brightness enhancement film may be made of materials with different refractive indices, and in the present invention, it may be used to adjust a portion of the light in the bright area 102 to the dark area 101 to improve the brightness value of the dark area 101.
In an exemplary embodiment, the brightness enhancement film 200 includes a first surface 201 and a second surface 202, where the first surface 201 and the second surface 202 are disposed opposite to each other, and the first surface 201 is a prism surface 201 having a plurality of prism structures for adjusting a portion of light in the bright area 102 to the dark area 101. The second surface 202 is not limited to the present invention, and may be, for example, a smooth surface, a prism surface with a plurality of prism structures, or the like. In practical applications, the prism surface 201 of the brightness enhancement film 200 may be attached to the lower surface of the diffuser body 100 near the light source. That is, the present invention attaches a prism surface with a prism structure in the brightness enhancement film 200 to the lower surface of the diffusion plate body 100, so as to better concentrate/adjust part of the light in the bright area 102 to the dark area 101.
For example, please refer to fig. 2 and 3, which illustrate two possible structures of the brightness enhancement film 200. As shown in fig. 2 and 3, the brightness enhancement film 200 includes a smooth surface and a prism surface, and the prism surface includes a plurality of prism structures thereon, which have a light-gathering effect, and the shape and size of the prism structures are not limited in the present invention. For example, as shown in fig. 2, the prismatic structures on the prismatic surface are saw-tooth shaped; as also shown in fig. 3, the prismatic structures on the prismatic surface are rounded.
Optionally, the shape, size and material of the brightness enhancement film 200 are not limited in the present invention, and may be determined according to practical requirements. To ensure the brightness adjustment effect, the width of the brightness enhancement film 200 is generally greater than the width of the dark light region 101. In an alternative embodiment, the brightness enhancement film 200 may also have the same shape and size as the dark region 101, in other words, the brightness enhancement film 200 has the same shape and size as the dark region 101. When the brightness enhancement film 200 is a prism sheet, the specification of the prism sheet is not limited, for example, the height of the prisms on the prism sheet may be 54 micrometers (um), the pitch of the prisms may be 50um, the thickness of the prism sheet may be 210um, etc., and the material may be CP71S-CN, etc.
In yet another example embodiment, the dark light region 101 is an edge region near an edge of the diffuser plate body 100. Accordingly, when the brightness enhancement film 200 is disposed, the brightness enhancement film 200 may be disposed in contact with the edge margin, i.e., the brightness enhancement film 200 is disposed immediately adjacent to the edge margin. Or the brightness enhancement film 200 is spaced from the edge, and a white area is reserved between the brightness enhancement film 200 and the edge, which is not limited by the present invention.
In practical applications, the shape and size of the diffusion plate body 100 are not limited, and can be set according to practical requirements. For example, the diffuser body 100 may be rectangular, square, diamond, etc. Taking the diffuser body 100 as an example, please refer to fig. 4, which illustrates a schematic diagram of a possible adhesion of the brightness enhancement film. As shown in fig. 4, normally, a dark area 101 appears around the diffuser body 100, i.e., the dark area 101 is four edge areas near four edges (an upper edge 1, a lower edge 2, a left edge 3, and a right edge 4 in the drawing) of the diffuser body 100. In the illustration, taking the edge as the right edge 4 as an example, when the brightness enhancement film 200 is disposed, the brightness enhancement film 200 is disposed in the edge area near the right edge 4, and a white area 300 is reserved between the brightness enhancement film 200 and the right edge 4. Wherein the white areas in the illustration represent the blank areas 300 and the gray areas represent the incremental film sheets 200 disposed on the edge areas.
In practical applications, the size and shape of the blank area 300 are not limited, and the respective widths of the blank area 300 and the brightness enhancement film 200 may be determined according to the dark area 101 (specifically, according to the width of the dark area 101), and typically, the width of the blank area 300 is smaller than the width of the brightness enhancement film 200.
For example, please refer to fig. 5, which illustrates a top view of a possible backlight module with the diffusion plate 10. The backlight module shown in fig. 5 includes: the back plate, the light source, the reflecting paper and the diffusion plate are sequentially stacked, the back plate has a certain inclined gradient, and the reflecting paper completely covers the back plate. In this example, the present invention may equally divide each of the oblique widths of the reflection paper (the oblique width of the edge is shown as a reference number ① in the drawing) by 4, wherein the width of the dark light region is 3 equal divisions, and the reflection paper is further extended by 1 equal division distance in the light source direction, and a total of 5 equal division distances (the reference number ② in the drawing) are obtained. In this example, the brightness enhancement film 200 may have a width of 4 equal parts, as shown in fig. ③, and the blank area 300 may have a width of 1 equal part, as shown in fig. ④. In this example, the ratio of the width of the brightness enhancement film 200 to the width of the blank area 300 is 4:1. Similarly, by adopting the above principle, the width of the brightness enhancement film 200 disposed on the dark light area of the other edge in the backlight module can be determined, which is not described in detail in the present invention.
In yet another exemplary embodiment, when the brightness enhancement film 200 is disposed, the brightness enhancement film 200 is disposed parallel to the edge line, specifically, the length direction of the brightness enhancement film 200 is disposed parallel to the edge line, for example, please refer to fig. 4, in which the length direction of the brightness enhancement film 200 is disposed parallel to the edge line.
In yet another example embodiment, when the brightness enhancement film 200 is disposed, the brightness enhancement film 200 is disposed at an angle with respect to the edge line, specifically, the length direction of the brightness enhancement film 200 is disposed at an angle with respect to the edge line, and the angle between the length direction and the edge line is smaller than a preset angle, which is set by system customization, for example, 3 ℃.
In yet another example embodiment, when there are a plurality of the dark areas 101 and there is an abutting relationship between the edge lines corresponding to the plurality of the dark areas 101, two brightness enhancement films 200 corresponding to two adjacent edge lines are closely attached to each other, in other words, the brightness enhancement films 200 corresponding to two adjacent edge lines need to be closely attached together during the transfer, without obvious attaching gaps or the like. In practical application, they can be made into an integral membrane without splicing, and corresponding lugs or positioning convex hulls can be designed on the integral membrane so as to facilitate installation and arrangement.
For example, please refer to fig. 6, which illustrates a schematic structure of a diffusion plate. The diffusion plate shown in fig. 6 includes a diffusion plate body 100 and brightness enhancement films 200 disposed on 4 edge regions of the diffusion plate body 100. As shown in fig. 6, 4 edge regions in the diffusion plate body 100 are an upper edge region near the upper edge line, a lower edge region near the lower edge line, a left edge region near the left edge line, and a right edge region near the right edge line, respectively, and have an abutting relationship therebetween. As shown, when the brightness enhancement films 200 corresponding to the adjacent edges are disposed, they need to be closely adhered to each other, and no obvious splice gap exists between them, which may require that the respective cut angles of the brightness enhancement films 200 of the adjacent edges are perpendicular to each other, for example, the cut angle of the brightness enhancement film corresponding to the upper/lower edge may be, for example, 0 °, and the cut angle of the brightness enhancement film corresponding to the left/right edge may be, for example, 90 °. In practical applications, to prevent interference patterns, the cutting angle of the brightness enhancement film may be rotated by a predetermined angle, for example, ±3°, etc.
In practical applications, the brightness enhancement film 200 in the horizontal direction, such as the brightness enhancement film corresponding to the upper/lower edge in fig. 6, can be used to concentrate/adjust the light in the vertical direction in the bright area to a smaller angle range, i.e. to the dark area, so as to increase the brightness of the light in the vertical direction in the dark area. Similarly, the brightness enhancement film 200 in the vertical direction, such as the brightness enhancement film corresponding to the left/right edge in fig. 6, can be used to concentrate/adjust the light in the horizontal direction in the bright area to a smaller angle range, thereby increasing the brightness of the light in the horizontal direction in the dark area.
For another example, please refer to fig. 7, which illustrates a schematic diagram of a possible diffuser plate-based backlight effect. As shown in fig. 7, an integral brightness enhancement film is disposed on the diffusion plate (i.e., the diffusion plate body 100), wherein the white area in the drawing is a bright area 102 on the diffusion plate body 100, and the rest is a dark area 101. The size of the bright area 102 in the illustration depends on the arrangement mode of the LED light bars arranged below the diffusion plate, and when the arrangement area of the LED light bars is larger, the bright area 102 is larger; conversely, when the LED light bar arrangement area is smaller, the bright area 102 is smaller. And an integral brightness enhancement film 200 is disposed on the dark light region 101 to adjust part of the light in the bright region 102 in the diffusion plate to the dark light region 101, so as to improve the brightness of the light in the dark light region 101.
By implementing the present invention, the present invention provides a diffusion plate including: the diffusion plate comprises a diffusion plate body and a brightening membrane, wherein the brightening membrane is arranged in a dark light area of the diffusion plate body, the brightening membrane is used for adjusting part of light rays in a bright light area of the diffusion plate body to the dark light area so as to improve the brightness value of the dark light area, the dark light area is an area where a light source irradiates the diffusion plate body and the brightness value is smaller than a preset threshold value, and the bright light area is an area where the light source irradiates the diffusion plate body and the brightness value is larger than or equal to the preset threshold value. In the above scheme, the brightening film is arranged on the dark light area of the diffusion plate body so as to adjust part of light rays in the bright light area of the diffusion plate body to the dark light area, thereby improving the brightness intensity of the dark light area and ensuring that the brightness intensity of the bright light area and the brightness intensity of the dark light area in the diffusion plate body are uniform and moderate. Compared with the prior art, the backlight module can also reduce the light loss in the cavity of the backlight module and improve the light utilization rate; the number of holes or silk-screen printing of the reflecting sheet is reduced, the cost of cutting or silk-screen printing of the reflecting sheet is reduced, and meanwhile, the technical problems that the central area of the direct type backlight module is strong in brightness and the periphery of the direct type backlight module is dark in brightness, and shadows appear at four corners during display of a direct type television are solved.
Fig. 8 is a schematic flow chart of a method for manufacturing a diffusion plate according to an embodiment of the invention. The method as shown in fig. 8 includes the following implementation steps:
S801, providing a diffusion plate body 100 and a brightness enhancement film 200, wherein the diffusion plate body 100 includes a dark light region 101 and a bright light region 102.
The dark light region 101 in the present invention refers to a region where the luminance value of the light source irradiated onto the diffuser body is smaller than a preset first threshold value. The bright area 102 is an area where the luminance value of the light source irradiated onto the diffusion plate body is greater than or equal to a preset second threshold value. The preset first threshold and the preset second threshold are both thresholds set by a system in a self-defining way, and may be the same or different, which is not limited by the present invention.
S802, disposing the brightness enhancement film 200 in the dark light region 101 of the diffuser body 100, thereby obtaining the diffuser 10. The brightness enhancement film 200 is used for adjusting part of light in the bright area 102 of the diffusion plate body 100 to the dark area 101 to improve the light brightness of the dark area 101, so that the dark area 101 is not too dark and the bright area 102 is not too bright, thereby ensuring the uniformity of the light brightness in the diffusion plate 10.
In an exemplary embodiment, at least the lower surface of the diffusion plate body 100 near the light source in the dark light region 101 may be treated as a rough surface, or the entire lower surface of the diffusion plate body 100 near the light source may be directly treated as a rough surface to increase surface roughness and friction. And further, the brightness enhancement film 200 is attached to the rough surface corresponding to the dark light area 101, so that the brightness enhancement film 200 is better and more firmly attached to the dark light area 101 of the diffusion plate body 100, thereby obtaining the diffusion plate 10. In practical applications, the bonding embodiment of the present invention is not limited, for example, glue of the same type as that used in manufacturing the diffusion plate body 100 is coated on the dark light area 101 (i.e. the corresponding rough surface) of the diffusion plate body 100, and then the brightness enhancement film with the corresponding shape and size is cut in advance, and the prism face is bonded with the rough surface and dried.
The embodiments of the present invention may be described with reference to the embodiments described in fig. 1 to 7, and details thereof are not described herein.
According to the embodiment of the invention, the brightening film is arranged on the dark light area of the diffusion plate body, so that part of light rays in the bright light area of the diffusion plate body are adjusted to the dark light area, the bright intensity of the dark light area is improved, the bright intensity of the bright light area and the bright intensity of the dark light area in the diffusion plate body are uniform and moderate, the technical problems that the central area of the direct type backlight module is strong in brightness and the periphery of the direct type backlight module is dark in brightness, and shadows appear at four corners during display of the direct type television are further solved.
In addition, the embodiment of the present invention further provides a backlight module, which includes the diffusion plate described in the above embodiment, and the specific reference is made to the related description in the embodiment described in the foregoing fig. 1 to 7, which is not repeated here.
The embodiment of the invention also provides a display device which comprises the backlight module and a display panel laminated with the backlight module.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (11)
1. A diffuser plate, the diffuser plate comprising:
A diffusion plate body;
The brightness enhancement film is arranged in a dark light area of the diffusion plate body and is used for adjusting part of light rays in the bright light area of the diffusion plate body to the dark light area, the dark light area is an area, irradiated by a light source, of which the brightness value is smaller than a preset first threshold value, and the bright light area is an area, irradiated by the light source, of which the brightness value is larger than or equal to a preset second threshold value;
The brightness enhancement film comprises a prism surface with a plurality of prism structures, and the prism surface is attached to the lower surface, close to the light source, of the diffusion plate body; the dark light area is an edge area close to an edge line of the diffusion plate body, and a white area is reserved between the brightness enhancement film and the edge line; and the respective widths of the blank-keeping area and the brightness enhancement film are determined according to the width of the dark light area.
2. The diffuser plate of claim 1 wherein the white space has a width that is less than the width of the brightness enhancing film.
3. The diffuser plate of claim 1, wherein the length of the brightness enhancement film is disposed parallel to the edge line.
4. The diffuser plate of claim 1 wherein the length of the brightness enhancement film is disposed at an angle to the edge line, the angle between the length and the edge line being less than a predetermined angle.
5. The diffuser plate of claim 1, wherein when there are a plurality of the dark regions and there is an abutting relationship between edge lines corresponding to the plurality of the dark regions, two brightness enhancement films corresponding to two adjacent edge lines are disposed in a fitting manner.
6. The diffuser plate of claim 1 wherein the brightness enhancing film has a width that is greater than the width of the dark area.
7. The diffuser plate of claim 1, wherein the brightness enhancement film and the dark-light region are each the same shape and size.
8. A method of making a diffuser plate, the method comprising:
providing a diffusion plate body and a brightening membrane, wherein the diffusion plate body comprises a bright light area and a dark light area;
The brightness enhancement film is arranged in a dark light area of the diffusion plate body, so that the diffusion plate is obtained, the brightness enhancement film comprises a prism surface with a plurality of prism structures, and the prism surface is attached to the lower surface, close to a light source, of the diffusion plate body; the dark light area is an edge area close to an edge line of the diffusion plate body, and a white area is reserved between the brightness enhancement film and the edge line; the respective widths of the blank-keeping areas and the brightness enhancement films are determined according to the widths of the dark light areas;
the brightness enhancement film is used for adjusting part of light rays in a bright area of the diffusion plate body to a dark light area, wherein the dark light area is an area where the light source irradiates the diffusion plate body and the brightness value is smaller than a preset first threshold value, and the bright area is an area where the light source irradiates the diffusion plate body and the brightness value is larger than or equal to a preset second threshold value.
9. The method of claim 8, wherein disposing the brightness enhancement film in a dark area of the diffuser body to obtain the diffuser comprises:
at least treating the lower surface, close to the light source, of the diffusion plate body where the dark light area is located to be a rough surface;
And attaching the brightening film to the rough surface so as to attach the brightening film to the dark light area of the diffusion plate body, thereby obtaining the diffusion plate.
10. A backlight module comprising a diffuser plate according to any one of claims 1-7.
11. A display device comprising a backlight module according to claim 10 and a display panel laminated with the backlight module.
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| CN202111354601.9A CN114089562B (en) | 2021-11-16 | 2021-11-16 | Diffusion plate, preparation method, backlight module and display device |
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| CN205619125U (en) * | 2016-05-17 | 2016-10-05 | 四川长虹电器股份有限公司 | Direct type backlight module |
| CN206038948U (en) * | 2016-09-29 | 2017-03-22 | 广州创维平面显示科技有限公司 | Prism piece, have its straight following formula backlight unit and LCD |
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| CN114089562A (en) | 2022-02-25 |
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