CN114089562A - 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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- CN114089562A CN114089562A CN202111354601.9A CN202111354601A CN114089562A CN 114089562 A CN114089562 A CN 114089562A CN 202111354601 A CN202111354601 A CN 202111354601A CN 114089562 A CN114089562 A CN 114089562A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000005282 brightening Methods 0.000 claims abstract description 12
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 230000002708 enhancing effect Effects 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 9
- 240000004282 Grewia occidentalis Species 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 76
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007650 screen-printing Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000004075 alteration Effects 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
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005855 radiation Effects 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
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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
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- 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
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- 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: a diffusion plate body; the brightening membrane is arranged in a dim light area of the diffusion plate body and used for adjusting partial light in the bright light area of the diffusion plate body to the dim light area, the dim light area is an area, with the brightness value smaller than a preset threshold value, irradiated on the diffusion plate body by a light source, and the bright light area is an area, with the brightness value larger than or equal to the preset threshold value, irradiated on the diffusion plate body by the light source. The invention can solve 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 displays four-corner shadows.
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
Liquid crystal displays (lcds) have many advantages such as power saving and no radiation, and are widely used, and particularly, they include 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 to normally display the image, and thus the backlight module constitutes one of the key components of the liquid crystal display.
At present, in the backlight module with emitting diode (LED) as the backlight, the LED of straight following formula backlight unit arranges as the matrix, and it is stronger that so arrange can lead to the regional brightness in module central authorities, and it is darker all around to the brightness is dark to overlap in four corners department, when making straight following formula TV show, the shadow can appear in the four corners.
Disclosure of Invention
The embodiment of the invention provides a diffusion plate, a preparation method, a backlight module and a display device, and solves the technical problem that four-corner shadows appear in direct type television display due to the fact that a central area of a direct type backlight module is brighter and the periphery of the direct type backlight module is darker in the prior art.
In one aspect, the present invention provides a diffusion plate according to an embodiment of the present invention, including:
a diffusion plate body;
the brightening membrane is arranged in a dim light area of the diffusion plate body and used for adjusting partial light in the bright light area of the diffusion plate body to the dim light area, the dim light area is an area, with the brightness value smaller than a preset threshold value, irradiated on the diffusion plate body by a light source, and the bright light area is an area, with the brightness value larger than or equal to the preset threshold value, irradiated on the diffusion plate body by the light source.
Optionally, the brightness enhancing film includes a prismatic surface having a plurality of prismatic structures, the prismatic surface being disposed adjacent to a lower surface of the diffuser body proximate to the light sources.
Optionally, the dark light region is an edge region close to an edge line of the diffuser plate body, and a blank region exists between the brightness enhancement film and the edge line.
Optionally, the width of the margin region is less than the width of the brightness enhancing film sheet.
Optionally, the length direction of the brightness enhancement film is parallel to the edge line.
Optionally, the length direction of the brightening membrane 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 there are a plurality of dark light regions and there is an abutting relationship between edge lines corresponding to the plurality of dark light regions, two brightness enhancement films corresponding to two adjacent edge lines are attached to each other.
Optionally, the width of the brightness enhancing film sheet is greater than the width of the dim zone.
Optionally, the brightness enhancing film and the dark light regions are each the same shape and size.
In another aspect, the present invention provides a method for manufacturing a diffusion plate, including:
providing a diffusion plate body and a brightening membrane, wherein the diffusion plate body comprises a bright light area and a dark light area;
arranging the brightness enhancement film on a dark light area of the diffuser plate body, thereby obtaining the diffuser plate;
the brightening membrane is used for adjusting part of light rays in a bright light area of the diffusion plate body to a dark light area, the bright light area is an area with a brightness value larger than or equal to a preset threshold value when a light source irradiates the diffusion plate body, and the dark light area is an area with a brightness value smaller than the preset threshold value when the light source irradiates the diffusion plate body.
Optionally, the disposing the brightness enhancement film on the dark light region of the diffuser plate body to obtain the diffuser plate comprises:
processing the lower surface of the diffusion plate body in which the dark light area is positioned, which is close to the light source, into a rough surface;
attaching the brightness enhancement film to the roughened surface to attach the brightness enhancement film to the dark light region of the diffuser plate body, thereby obtaining the diffuser plate.
In another aspect, the present invention provides a backlight module according to an embodiment of the present invention, which includes the diffuser 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 on the backlight module.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: the present invention provides a diffusion plate comprising: the brightening membrane is arranged in a dim light area of the diffusion plate body and used for adjusting partial light in a bright light area of the diffusion plate body to the dim light area so as to improve the brightness value of the dim light area, the dim light area is an area with the brightness value smaller than a preset threshold value when a light source irradiates the diffusion plate body, and the bright light area is an area with the brightness value larger than or equal to the preset threshold value when the light source irradiates the diffusion plate body. Among the above-mentioned scheme, set up the blast diaphragm on the dim light region of diffuser plate body to adjust the partial light in the bright light region of diffuser plate body to the dim light region, with the bright intensity who improves the dim light region, make the bright intensity of bright light region and the bright intensity of dim light region in the diffuser plate body even moderate, thereby improve the regional bright stronger, bright darker all around of central authorities of straight following formula backlight unit, and then technical problem such as shadow appears in the four corners when leading to straight following formula TV set demonstration.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a diffusion plate according to an embodiment of the present invention.
FIGS. 2 and 3 are schematic views of two possible brightness enhancing film configurations provided by embodiments of the present invention.
FIG. 4 is a schematic diagram of one possible brightness enhancing film lamination 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 diffuser plate according to an embodiment of the invention.
Fig. 8 is a schematic flow chart illustrating a method for manufacturing a diffuser plate according to an embodiment of the present invention.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The applicant has also found in the course of the present application that: due to the arrangement mode of the LEDs in the direct type backlight module, the direct type television always has the phenomena of bright edges, dark frames, dark corners and the like, and the phenomena can cause the picture light to be excessively uneven, thereby influencing the impression of a user. In order to solve these problems, in the prior art, the spacing between the lamps is usually adjusted by punching or silk-screen printing, a reflector with a good diffuse reflection effect is selected, the transmittance of the optical film is reduced, and the concealing degree is improved, so as to alleviate these phenomena. However, these techniques usually sacrifice the total light quantity in the cavity of the backlight module to achieve the improvement of the visual effect, and may possibly affect the display brightness of the television.
In order to solve the above problems, the present invention provides a diffusion plate, a method for manufacturing the same, a backlight module and a display device. Fig. 1 is a schematic structural diagram of a diffuser plate according to an embodiment of the present invention. The diffusion plate 10 shown in fig. 1 includes: a diffuser body 100 and a brightness enhancing film 200. The brightness enhancement film 200 is disposed on the dark light region 101 of the diffuser body 100, and is used for adjusting a portion of light in the bright light region 102 of the diffuser body 100 to the dark light region 101, so as to increase the brightness value of the dark light region 101, and decrease the brightness value of the bright light region 102, so that the dark light region 101 is not too dark, the bright light region 102 is not too bright, and the uniformity of the brightness of the light in the diffuser 10 is ensured.
The dark light region 101 is a region where the brightness value of the diffusion plate body irradiated by the light source is smaller than a preset first threshold, and the bright light region 102 is a region where the brightness value of the diffusion plate body irradiated by the light source is greater than or equal to a preset second threshold. In other words, the dark light region 101 refers to a region where the brightness value of the diffusion plate body is small when the diffusion plate body is irradiated by a light source, and the bright light region 102 refers to a region where the brightness value of the diffusion plate body is large when the diffusion plate body is irradiated by a light source. The preset first threshold and the preset second threshold are both thresholds set by a system in a self-defined manner, for example, the preset first threshold and the preset second threshold may be set according to actual needs of the system, or may be 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, which is not limited in the present invention.
In practical applications, the shapes and sizes of the dark light region 101 and the bright light region 102 are not limited in the present invention. For example, in an application scenario of the direct-type backlight module, the dim light area 101 may be a fan-shaped dim angle 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, and the like, which may be determined according to practical situations, and the invention is not limited thereto.
The brightness enhancement film 200, which may also be referred to as a prism film or a light-gathering film, is used to improve the brightness and uniformity of the diffuser body 100, and may include, but is not limited to, a general prism sheet, a multifunctional prism sheet, a micro-lens film, a reflective polarization brightness enhancement film, and the like. The general prism sheet is configured to adjust a portion of light in the bright area 102 to the dark area 101, and guide the light incident into the dark area 101, so as to increase 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 compared with the common prism sheet. The microlens film is obtained by integrating prism sheet and diffusion sheet functions into one film. The reflective brightness enhancement film can be made of materials with different refractive indexes, and can be used for adjusting part of light in the bright area 102 into the dark area 101 to improve the brightness value of the dark area 101 in the present invention.
In an exemplary embodiment, the brightness enhancing film 200 includes a first surface 201 and a second surface 202, 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 light region 102 into the dark light region 101. The second surface 202 is not limited in the present invention, and may be a smooth surface, a prism surface having 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 on the side close to the light source. That is, in the present invention, a prism surface of the brightness enhancement film 200 having a prism structure is attached to the lower surface of the diffuser 100, so as to better converge/adjust a portion of the light in the bright region 102 to the dark region 101.
For example, reference is made to FIGS. 2 and 3 which show two possible brightness enhancing film sheet 200 configurations. 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 for light gathering, 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-toothed; as further shown in fig. 3, the prismatic structures on the prism surface are rounded.
Alternatively, the shape, size and material of the brightness enhancement film 200 may not be limited, and may be determined according to actual requirements. To ensure the brightness adjustment effect, the width of the brightness enhancement film 200 is typically larger than the width of the dim area 101. In an alternative embodiment, the brightness enhancing film 200 may also be the same shape and size as the dim area 101, in other words, the brightness enhancing film 200 is the same shape and size as the dim area 101. When the brightness enhancement film 200 is a prism sheet, the specification of the prism sheet is not limited in the present invention, for example, the height of the prism peak on the prism sheet may be 54 micrometers (um), the pitch of the prism peak may be 50um, the thickness of the prism sheet may be 210um, and the like, and the material thereof may be CP71S-CN, and the like.
In yet another exemplary embodiment, the dim light area 101 is an edge area near the edge of the diffuser plate body 100. Accordingly, when the brightness enhancing film 200 is disposed, the brightness enhancing film 200 may be disposed in contact with the edge margins, i.e., the brightness enhancing film 200 is disposed immediately adjacent the edge margins. Alternatively, the brightness enhancement film 200 and the edge are disposed at intervals, and a blank area exists between the brightness enhancement film 200 and the edge, which is not limited in the present invention.
In practical applications, the shape and size of the diffuser 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. For example, the diffuser body 100 is rectangular, and fig. 4 is a schematic view showing a possible lamination of brightness enhancement films. As shown in fig. 4, dark light regions 101 are usually present around the diffuser body 100, i.e., the dark light regions 101 are four edge regions near four edges (shown as an upper edge 1, a lower edge 2, a left edge 3, and a right edge 4 in the figure) in the diffuser body 100. Taking the edge as the right edge 4 as an example, when the brightness enhancing film 200 is disposed, the brightness enhancing film 200 is disposed in the edge region near the right edge 4, and a margin region 300 exists between the brightness enhancing film 200 and the right edge 4. In the figure, the white areas represent the margin areas 300, and the gray areas represent the incremental diaphragms 200 arranged on the edge areas.
In practice, the size and shape of the blank area 300 is not limited, and the width of each of the blank area 300 and the brightness enhancing film 200 may be determined according to the width of the dim light area 101 (specifically, according to the width of the dim light area 101), and generally the width of the blank area 300 is smaller than the width of the brightness enhancing film 200.
For example, please refer to fig. 5, which shows a top view of a possible backlight module with the diffuser plate 10. The backlight module shown in fig. 5 includes: the backlight module comprises a back plate, a light source, reflecting paper and a diffusion plate which are sequentially stacked, wherein the back plate has a certain inclination, and the reflecting paper completely covers the back plate. In this example, the present invention can divide the width of each oblique side of the reflective paper (the oblique side width of the upper edge is shown as an example, and is shown as number (r)) by 4, wherein the width of the dark light region is 3, and the width of the dark light region is extended in the direction of the light source by 1, and the total of 5 equal distances (shown as number (r)) are provided. In this example, the brightness enhancing film sheet 200 may have a width equal to 4, specifically, as shown by the number (c) in the figure, and the blank area 300 may have a width equal to 1, specifically, as shown by the number (r) in the figure. In this example, the ratio of the width of the brightness enhancing film sheet 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 region of other edge edges in the backlight module can be determined, which is not described in detail herein.
In yet another exemplary embodiment, the brightness enhancing film 200 is disposed parallel to the edge lines, specifically the length of the brightness enhancing film 200 is disposed parallel to the edge lines, for example, see FIG. 4 for the length of the brightness enhancing film 200.
In yet another exemplary embodiment, when the brightness enhancing film 200 is disposed, the brightness enhancing film 200 is disposed at an angle to the edge line, specifically, the length direction of the brightness enhancing film 200 is disposed at an angle to the edge line, the angle between the length direction and the edge line is smaller than a predetermined angle, and the predetermined angle is set by a system user, for example, 3 ℃.
In another exemplary embodiment, when there are a plurality of dark light regions 101, and there is an abutting relationship between edge lines corresponding to a plurality of dark light regions 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 transferring, and there is no obvious attaching gap or the like. In practical application, the film can be made into an integral film without splicing, and the integral film can be provided with corresponding lugs or positioning convex hulls so as to facilitate installation and arrangement.
For example, please refer to fig. 6, which shows a schematic structural diagram of a diffuser plate. The diffuser plate shown in FIG. 6 includes a diffuser plate body 100 and brightness enhancement films 200 disposed on 4 edge regions of the diffuser plate body 100. As shown in fig. 6, the 4 edge regions of the diffuser plate body 100 are an upper edge region near an upper edge line, a lower edge region near a lower edge line, a left edge region near a left edge line, and a right edge region near a right edge line, which are adjacent to each other. As shown, when the brightness enhancing film sheets 200 corresponding to adjacent edge edges are disposed, they are closely fitted, there is no obvious splicing gap, and it may be required that the respective cutting angles of the brightness enhancing film sheets 200 of the adjacent edges are perpendicular to each other, for example, the cutting angle of the brightness enhancing film sheet corresponding to the upper/lower edge edges may be 0 ° for example, and the cutting angle of the brightness enhancing film sheet corresponding to the left/right edge edges may be 90 ° for example. In practical applications, the cutting angle of the brightness enhancement film may be a predetermined angle, such as ± 3 ° or the like, for preventing interference fringes.
In practice, a brightness enhancement film 200 in the horizontal direction, such as the brightness enhancement film corresponding to the top/bottom edge in FIG. 6, can be used to focus/adjust the light in the vertical direction in the bright area to a smaller angular range, i.e., in the dim area, thereby increasing the light brightness in the vertical direction in the dim area. Similarly, a vertically oriented brightness enhancing film 200, such as the brightness enhancing film corresponding to the left/right edge in FIG. 6, may be used to focus/adjust the horizontal light in the bright area to a smaller angular range, thereby increasing the horizontal light brightness in the dim area.
For another example, please refer to fig. 7, which shows a schematic diagram of a possible backlight effect based on a diffuser plate. As shown in fig. 7, the diffuser plate (i.e., the diffuser plate body 100) is provided with an integrated brightness enhancement film, and the white area in the drawing is a bright area 102 on the diffuser plate body 100, and the rest areas are dark areas 101. In the figure, the size of the bright light area 102 depends on the arrangement mode of the LED light bars disposed below the diffusion plate, and when the arrangement area of the LED light bars is larger, the bright light area 102 is larger; on the contrary, when the LED light bar arrangement area is smaller, the bright area 102 is also smaller. And an integral brightness enhancement film 200 is disposed on the dim light region 101 to adjust part of the light in the bright light region 102 of the diffuser plate to the dim light region 101, so as to improve the brightness of the dim light region 101.
By carrying out the present invention, there is provided a diffusion plate comprising: the brightening membrane is arranged in a dim light area of the diffusion plate body and used for adjusting partial light in a bright light area of the diffusion plate body to the dim light area so as to improve the brightness value of the dim light area, the dim light area is an area with the brightness value smaller than a preset threshold value when a light source irradiates the diffusion plate body, and the bright light area is an area with the brightness value larger than or equal to the preset threshold value when the light source irradiates the diffusion plate body. In the above-mentioned scheme, set up the brightening diaphragm in the dim light region of diffuser plate body to adjust the partial light in the bright light region of diffuser plate body to the dim light region, with the bright intensity in improvement dim light region, make the bright intensity in bright light region and the bright intensity in dim light region in the diffuser plate body even moderate. Compared with the prior art, the backlight module has the advantages that the light loss in the cavity of the backlight module can be reduced, and the light utilization rate is improved; reduce the reflector plate and punch or silk screen printing quantity, reduced the reflector plate and cut or the expense of silk screen printing, it is bright stronger, bright darker all around still to have solved straight following formula backlight unit's central zone simultaneously, and then shadow etc. technical problem appear in the four corners when leading to straight following formula TV set demonstration.
Fig. 8 is a schematic flow chart illustrating a method for manufacturing a diffuser plate according to an embodiment of the present invention. The method as shown in fig. 8 comprises the following implementation steps:
s801, providing a diffuser plate body 100 and a brightness enhancement film sheet 200, wherein the diffuser plate body 100 comprises a dark light region 101 and a bright light region 102.
The dark light region 101 refers to a region where the brightness value of the diffusion plate body irradiated by the light source is smaller than a preset first threshold value. The bright area 102 is an area where the brightness value of the light source irradiated on 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-defined manner, and may be the same or different, and the present invention is not limited.
S802, arranging the brightness enhancement film 200 in the dim light area 101 of the diffuser plate body 100, and thus obtaining the diffuser plate 10. The brightness enhancement film 200 is used to adjust a portion of light in the bright region 102 of the diffuser plate 100 to the dark region 101, so as to improve the brightness of the dark region 101, so that the dark region 101 is not too dark and the bright region 102 is not too bright, thereby ensuring the uniformity of the brightness of the light in the diffuser plate 10.
In an exemplary embodiment, at least the lower surface of the diffusion plate body 100 where the dim light region 101 is located near the light source may be processed into a rough surface, or the entire lower surface of the diffusion plate body 100 near the light source may be directly processed into a rough surface, so as to increase the surface roughness and the friction. And then attaching the brightness enhancement film 200 to the corresponding rough surface of the dim light region 101, so as to attach the brightness enhancement film 200 to the dim light region 101 of the diffuser plate body 100 better and more firmly, thereby obtaining the diffuser plate 10. In practical applications, the present invention is not limited to the above-mentioned bonding embodiment, for example, glue of the same type as that used in manufacturing the diffuser body 100 is coated on the dark light region 101 (i.e., the corresponding rough surface) of the diffuser body 100, and then the brightness enhancement film sheet cut in advance to have a corresponding shape and size is bonded and dried by the prism surface and the rough surface.
For the content that is not introduced or described in the embodiments of the present invention, reference may be made to the related descriptions in the embodiments described in fig. 1 to fig. 7, and the description of the present invention is omitted here.
By implementing the embodiment of the invention, the brightening membrane is arranged on the dark light area of the diffusion plate body, so that part of light in the bright light area of the diffusion plate body is adjusted to the dark light area, the brightness intensity of the dark light area is improved, the brightness intensity of the bright light area in the diffusion plate body and the brightness intensity of the dark light area are uniform and moderate, and 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, and shadow appears at four corners when the direct type television is displayed are solved.
In addition, an embodiment of the present invention further provides a backlight module, where the backlight module includes the diffuser plate described in the above embodiments, which is specifically described in the embodiments described in fig. 1 to fig. 7, and is not described herein again.
The embodiment of the invention also provides a display device which comprises the backlight module and a display panel which is stacked 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A diffuser plate, comprising:
a diffusion plate body;
the brightening membrane is arranged in a dark light area of the diffusion plate body and used for adjusting partial light in a bright light area of the diffusion plate body to the dark light area, the dark light area is an area with the brightness value smaller than a preset first threshold value when a light source irradiates the diffusion plate body, and the bright light area is an area with the brightness value larger than or equal to a preset second threshold value when the light source irradiates the diffusion plate body.
2. The diffuser plate of claim 1, wherein the brightness enhancing film comprises a prismatic surface having a plurality of prismatic structures, the prismatic surface being disposed adjacent to a lower surface of the diffuser plate body adjacent to the light sources.
3. The diffuser plate of claim 1 wherein the dark light regions are edge regions proximate to edge lines of the diffuser plate body, with a blank region between the brightness enhancing film and the edge lines.
4. A diffuser plate as recited in claim 3 wherein the width of the blank area is less than the width of the brightness enhancing film sheet.
5. A diffuser plate according to claim 3, wherein the length of the brightness enhancing film is parallel to the edge lines.
6. A diffuser plate according to claim 3, wherein the length of the brightness enhancing film is disposed at an angle to the edge line, and the angle between the length and the edge line is less than a predetermined angle.
7. The diffuser plate as claimed in claim 3, wherein when there are a plurality of dark light regions and there is an abutting relationship between the edge lines corresponding to the plurality of dark light regions, two brightness enhancement films corresponding to two adjacent edge lines are attached to each other.
8. The diffuser plate of claim 1 wherein the width of the brightness enhancing film sheet is greater than the width of the dim zone.
9. The diffuser plate of claim 1 wherein the brightness enhancing film and the dark light region are each the same shape and size.
10. A method for preparing a diffusion 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;
arranging the brightness enhancement film on a dark light area of the diffuser plate body, thereby obtaining the diffuser plate;
the brightening membrane is used for adjusting part of light rays in a bright light area of the diffusion plate body to a dark light area, the dark light area is an area with a brightness value smaller than a preset first threshold value when the light source irradiates the diffusion plate body, and the bright light area is an area with a brightness value larger than or equal to a preset second threshold value when the light source irradiates the diffusion plate body.
11. The method of claim 10, wherein the disposing the brightness enhancing film in the dark area of the diffuser plate body to obtain the diffuser plate comprises:
processing the lower surface of the diffusion plate body in which the dark light area is positioned, which is close to the light source, into a rough surface;
attaching the brightness enhancement film to the roughened surface to attach the brightness enhancement film to the dark light region of the diffuser plate body, thereby obtaining the diffuser plate.
12. A backlight module, characterized in that the backlight module comprises a diffuser plate as claimed in any one of the preceding claims 1 to 9.
13. A display device, comprising the backlight module as claimed in claim 12, and a display panel stacked on 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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| CN202111354601.9A CN114089562B (en) | 2021-11-16 | 2021-11-16 | Diffusion plate, preparation method, backlight module and display device |
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| CN114089562A true CN114089562A (en) | 2022-02-25 |
| CN114089562B CN114089562B (en) | 2024-04-19 |
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| CN114089562B (en) | 2024-04-19 |
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