CN114442370B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN114442370B CN114442370B CN202111668265.5A CN202111668265A CN114442370B CN 114442370 B CN114442370 B CN 114442370B CN 202111668265 A CN202111668265 A CN 202111668265A CN 114442370 B CN114442370 B CN 114442370B
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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
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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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
- G02F1/133605—Direct backlight including specially adapted reflectors
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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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the invention discloses a backlight module and a display device, wherein the backlight module comprises: a substrate; the light-emitting device comprises a substrate, a plurality of light-emitting elements and a plurality of reflecting structures, wherein the light-emitting elements and the reflecting structures are arranged on one side of the substrate in an array manner, the reflecting structures are positioned in a gap area between the light-emitting elements, and the gap area at least partially surrounds the light-emitting elements; the protective layer is positioned on one side of the substrate, is positioned on the same side as the light-emitting element, and covers the vertical projection of the light-emitting element on the substrate by the vertical projection of the protective layer on the substrate; the protection layer is provided with a plurality of semi-transparent and semi-reflective structures on one side far away from the light-emitting element, the vertical projection of the semi-transparent and semi-reflective structures on the substrate overlaps with the vertical projection of the light-emitting element on the substrate, and the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light-emitting direction of the backlight module. The backlight module provided by the embodiment of the invention can reduce the brightness of the area where the light-emitting element is positioned, improve the brightness of the gap area, improve the uneven brightness of the backlight module and improve the light-emitting uniformity of the backlight module.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the continuous development of liquid crystal display technology, liquid crystal display devices have been widely used in various aspects of life. The liquid crystal display device comprises a backlight module and a display panel, wherein the backlight module provides a light source for the display panel and is an indispensable part of the liquid crystal display device.
Because of the power consumption, cost and thickness consideration, the backlight module is required to have the characteristics of low power consumption, low cost and thinner thickness, in order to reduce the power consumption and cost, the backlight module generally uses fewer light emitting elements, so that the interval between the light emitting elements is larger, the thickness of the backlight module is thinner, the light mixing distance is reduced, the phenomenon that the area where the light eyes of the light emitting elements are positioned is brighter and the other areas are darker is finally presented, the problem of uneven brightness appears in the backlight module, and the phenomenon similar to a 'star of all the world' is formed.
Disclosure of Invention
The embodiment of the invention provides a backlight module and a display device, which are used for solving the problem that uneven brightness appears in the display of the backlight module.
The embodiment of the invention provides a backlight module, which comprises:
a substrate;
a plurality of light emitting elements arranged in an array and a plurality of reflecting structures positioned at one side of the substrate, wherein the reflecting structures are positioned in a gap area between the light emitting elements, and the gap area at least partially surrounds the light emitting elements;
the protective layer is positioned on one side of the substrate, is positioned on the same side as the light-emitting element, and covers the vertical projection of the light-emitting element on the substrate in the vertical projection of the protective layer on the substrate; the light emitting device comprises a light emitting element, a protective layer and a substrate, wherein the light emitting element is arranged on the substrate, one side of the protective layer, which is far away from the light emitting element, is provided with a plurality of semi-transparent and semi-reflective structures, the vertical projection of the semi-transparent and semi-reflective structures on the substrate is overlapped with the vertical projection of the light emitting element on the substrate, the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light emitting direction of the backlight module.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the backlight module.
According to the backlight module provided by the embodiment of the invention, the plurality of semi-transparent and semi-reflective structures are arranged on the side, far away from the light-emitting elements, of the protective layer, and the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light-emitting direction of the backlight module, part of light emitted by the light-emitting elements is reflected to the gap area between the light-emitting elements by the semi-transparent and semi-reflective structures, the reflection structure is arranged in the gap area between the light-emitting elements, and the part of light is reflected and emitted from the gap area by the reflection structure, so that the brightness of the area where the light-emitting elements are positioned can be reduced, the brightness of the gap area is improved, the brightness difference is reduced, the uneven brightness problem is solved, and the light-emitting uniformity of the backlight module is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments or the description of the prior art, and it is obvious that although the drawings in the following description are specific embodiments of the present invention, it is obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method, which are disclosed and suggested according to the various embodiments of the present invention, are extended and extended to other structures and drawings, and it is needless to say that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic top view of a backlight module according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view taken along section line AA' of FIG. 1;
FIG. 3 is another cross-sectional schematic view taken along section line AA' of FIG. 1;
FIG. 4 is a further schematic cross-sectional view taken along section line AA' in FIG. 1;
fig. 5 is a schematic top view of another backlight module according to an embodiment of the invention;
FIG. 6 is a schematic cross-sectional view taken along section line BB' in FIG. 5;
FIG. 7 is another cross-sectional schematic view taken along section line BB' in FIG. 5;
FIG. 8 is a further schematic cross-sectional view taken along section line AA' of FIG. 1;
fig. 9 is a schematic top view of a backlight module according to another embodiment of the invention;
FIG. 10 is a schematic cross-sectional view taken along section line CC' of FIG. 9;
FIG. 11 is a schematic top view of a backlight module according to another embodiment of the invention;
FIG. 12 is a schematic cross-sectional view taken along section line DD' in FIG. 11;
FIG. 13 is a schematic top view of an annular prism structure according to an embodiment of the present invention;
FIG. 14 is an enlarged partial schematic view of the loop structure set of FIG. 11;
fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described by means of implementation examples with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the basic concepts disclosed and suggested by the embodiments of the present invention are within the scope of the present invention.
In view of the problems mentioned in the background art, an embodiment of the present invention provides a backlight module, including: a substrate; the light-emitting device comprises a substrate, a plurality of light-emitting elements and a plurality of reflecting structures, wherein the light-emitting elements and the reflecting structures are arranged on one side of the substrate in an array manner, the reflecting structures are positioned in a gap area between the light-emitting elements, and the gap area at least partially surrounds the light-emitting elements; the protective layer is positioned on one side of the substrate, is positioned on the same side as the light-emitting element, and covers the vertical projection of the light-emitting element on the substrate by the vertical projection of the protective layer on the substrate; the protection layer is provided with a plurality of semi-transparent and semi-reflective structures on one side far away from the light-emitting element, the vertical projection of the semi-transparent and semi-reflective structures on the substrate overlaps with the vertical projection of the light-emitting element on the substrate, and the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light-emitting direction of the backlight module.
According to the backlight module provided by the embodiment of the invention, the plurality of semi-transparent and semi-reflective structures are arranged on the side, far away from the light-emitting elements, of the protective layer, and the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light-emitting direction of the backlight module, part of light emitted by the light-emitting elements is reflected to the gap area between the light-emitting elements by the semi-transparent and semi-reflective structures, the reflection structure is arranged in the gap area between the light-emitting elements, and the part of light is reflected and emitted from the gap area by the reflection structure, so that the brightness of the area where the light-emitting elements are positioned can be reduced, the brightness of the gap area is improved, the brightness difference is reduced, the uneven brightness problem is solved, and the light-emitting uniformity of the backlight module is improved.
The foregoing is the core idea of the present invention, and the following describes in detail the technical solution in the embodiment of the present invention with reference to the accompanying drawings in the embodiment of the present invention.
Fig. 1 is a schematic top view of a backlight module according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional view along a sectional line AA' in fig. 1, and referring to fig. 1 and fig. 2, a backlight module 10 according to an embodiment of the present invention includes: a substrate 100; a plurality of light emitting elements 200 arranged in an array and a plurality of reflection structures 300 positioned at one side of the substrate 100, the reflection structures 300 being positioned at a gap region between the light emitting elements 200, the gap region at least partially surrounding the light emitting elements 200; a protective layer 400 located on one side of the substrate 100, wherein the protective layer 400 is on the same side as the light emitting element 200, and the vertical projection of the protective layer 400 on the substrate 100 covers the vertical projection of the light emitting element 200 on the substrate 100; the side of the protection layer 400 away from the light emitting element 200 is provided with a plurality of half-transparent and half-reflective structures 500, wherein the vertical projection of the half-transparent and half-reflective structures 500 on the substrate 100 overlaps with the vertical projection of the light emitting element 200 on the substrate 100, and the projection area of the half-transparent and half-reflective structures 500 on the substrate 100 is gradually reduced along the light emitting direction Y of the backlight module 10.
Specifically, referring to fig. 1 and 2, the backlight module 10 provided in the embodiment of the present invention includes a substrate 100, a light emitting element 200, a reflective structure 300, a protective layer 400, and a semi-transparent and semi-reflective structure 500, where the light emitting element 200 may be a light emitting diode, such as a Mini LED, a Micro LED, etc., and the light emitting diode has the characteristics of small volume, long service life, rich colors, low energy consumption, and wide application, and the light emitting element 200 provides a light source for the backlight module 10. The reflective structure 300 is located at a gap region between the light emitting elements 200, and the reflective structure 300 is capable of reflecting light incident to the surface thereof. The protection layer 400 and the light emitting element 200 are located at the same side of the substrate 100, and the vertical projection of the protection layer 400 on the substrate 100 covers the vertical projection of the light emitting element 200 on the substrate 100, and the protection layer 400 may be a protection adhesive layer such as an ultraviolet adhesive, so as to protect the light emitting element 200 and prevent the light emitting element 200 from being corroded by water vapor.
The side of the protection layer 400 away from the light emitting element 200 is provided with a plurality of half-transparent and half-reflective structures 500, and the vertical projection of the half-transparent and half-reflective structures 500 on the substrate 100 overlaps with the vertical projection of the light emitting element 200 on the substrate 100, i.e. a half-transparent and half-reflective structure 500 is correspondingly arranged above one light emitting element 200, so that the light emitted by the light emitting element 200 can be incident on the half-transparent and half-reflective structures 500, and part of the light is refracted out, and part of the light is reflected to the gap area. In addition, along the light emitting direction of the backlight module 10, the projection area of the transflective structure 500 on the substrate 100 is gradually reduced, that is, the transflective structure 500 is similar to a quadrangular pyramid structure, and along the light emitting direction Y of the backlight module 10, the transflective structure 500 has an inclined plane, so that the angle of the reflected light is convenient to be regulated. Specifically, by the cooperation of the half-transparent and half-reflective structure 500 and the reflective structure 300, a part of light emitted by the light emitting element 200 is reflected by the half-transparent and half-reflective structure 500 and then enters the gap region of the light emitting element 200, and the part of light is reflected by the reflective structure 300 and then exits from the gap region, so that the brightness of the region where the light emitting element 200 is located is reduced, the brightness of the gap region is improved, the brightness difference is reduced, the uneven brightness problem is improved, and the light emitting uniformity of the backlight module 10 is improved.
It should be noted that, the number, the distribution manner and the materials of the reflective structures 300 are not limited in the embodiments of the present invention, and those skilled in the art can set the reflective structures according to actual requirements, so long as the reflective structures 300 are located in the gap regions between the light emitting elements 200 and have a reflective function. In addition, the material and specific structure of the transflective structure 500 are not limited, as long as the light is incident on the transflective structure 500, and can be refracted out and reflected to the gap region.
According to the backlight module provided by the embodiment of the invention, the plurality of semi-transparent and semi-reflective structures are arranged on the side, far away from the light-emitting elements, of the protective layer, and the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light-emitting direction of the backlight module, part of light emitted by the light-emitting elements is reflected to the gap area between the light-emitting elements by the semi-transparent and semi-reflective structures, the reflection structure is arranged in the gap area between the light-emitting elements, and the part of light is reflected and emitted from the gap area by the reflection structure, so that the brightness of the area where the light-emitting elements are positioned can be reduced, the brightness of the gap area is improved, the brightness difference is reduced, the uneven brightness problem is solved, and the light-emitting uniformity of the backlight module is improved.
Fig. 3 is another schematic cross-sectional view along the line AA' in fig. 1, and as shown in fig. 3, the substrate 100 is optionally integrally formed with the reflective structure 300.
In this embodiment, the substrate 100 and the reflective structure 300 can be manufactured simultaneously, and are integrally formed, so that no additional separate manufacturing of the reflective structure 300 is required, the process flow can be simplified, and the production efficiency can be improved. It will be appreciated that in other embodiments, the reflective structure 300 may be fabricated separately and formed separately (see FIG. 2).
Referring to fig. 1, alternatively, the geometric center line of the vertical projection of four light emitting elements 200 located in any two adjacent rows and two columns on the substrate 100 forms a quadrangle 11, and one reflective structure 300 is located at the geometric center of one quadrangle 11.
The luminance of the light eye of the light emitting element 200 is generally higher, the luminance of the gap area between the light emitting elements 200 is lower (the gap area can be understood as the area of the quadrangle 11 shown in fig. 1), the luminance of the gap area near the center of the gap area is lower than the luminance of the gap area far away from the center of the gap area, and the reflective structure 300 is arranged at the geometric center of the gap area relative to the reflective structure 300 arranged at other positions in the gap area, so that the luminance difference between the light emitting element 200 and the gap area is balanced, the uneven brightness problem is improved, and the structural shape of the half-transparent structure 500 is designed correspondingly, so that the light emitting uniformity of the backlight module 10 is improved through the mutual cooperation of the half-transparent structure 500 and the reflective structure 300. In addition, only one reflecting structure 300 is provided at the geometric center of the quadrangle 11, so that the number of reflecting structures 300 can be reduced, and the process can be simplified.
Referring to fig. 2 and 3, the reflective structure 300 may alternatively be convex toward a side near the protective layer 400.
In this embodiment, the reflective structure 300 may be protruded upward, that is, toward the side close to the protective layer 400, so that the reflective structure 300 with the protruded structure is easy to form and simple in process. Illustratively, the reflecting structure 300 may be an arc structure as shown in fig. 2 and 3, so that the light emitting angle of the light ray reflected by the arc structure can be conveniently adjusted by adjusting the radian of the arc structure, which is beneficial to the diffusion of the light beam, so that the backlight module 10 is more uniformly displayed. Specifically, the reflecting structure 300 may have a hemispherical shape, a conical shape or a cylindrical shape, and any shape of the reflecting structure 300 that can improve the uneven brightness is within the scope of the present invention.
Referring to fig. 2, optionally, a vertical distance h1 between a surface of the light emitting element 200 on a side away from the substrate 100 and the substrate 100 is greater than a maximum vertical distance h2 between the reflective structure 300 and the substrate 100 based on the above embodiment.
When the reflective structure 300 protrudes toward the side close to the protective layer 400, the maximum vertical distance h2 between the reflective structure 300 and the substrate 100 needs to be smaller than the vertical distance h1 between the surface of the light emitting element 200, which is far away from the side of the substrate 100, and the substrate 100, so as to ensure that the light reflected by the semi-transparent and semi-reflective structure 500 can reach the reflective structure 300, so that the reflective structure 300 can regulate the light emitting angle of the reflected light, ensure that the light is uniformly emitted from the gap area between the light emitting elements 200 after being reflected by the reflective structure 300, thereby improving the brightness of the gap area, balancing the brightness difference between the area where the light emitting element 200 is located and the gap area, and improving the light emitting uniformity of the backlight module 10.
Fig. 4 is a schematic cross-sectional view of fig. 1 along line AA', and as shown in fig. 4, the reflective structure 300 may alternatively be convex toward a side away from the protective layer 400.
In this embodiment, the reflective structure 300 may be protruded downward, i.e. protruded toward a side far away from the protective layer 400, so that the reflective structure 300 with the protruded structure is easy to be formed and the process is simple. Similarly, the reflecting structure 300 may be any shape such as a hemisphere, a cone or a cylinder when protruding downward, and may perform its reflecting function.
The reflective structure 300 protrudes towards one side far away from the protective layer 400, so that light reflected by the semi-transparent and semi-reflective structure 500 can reach the reflective structure 300, the reflective structure 300 can regulate and control the light emergent angle of the reflected light, and the light can be uniformly emergent from the gap area between the light emitting elements 200 after being reflected by the reflective structure 300, so that the brightness of the gap area is improved, the brightness of the area where the light emitting elements 200 are positioned is reduced, the brightness difference is reduced, and the light emergent uniformity of the backlight module 10 is improved.
It should be noted that, in fig. 4, the reflective structure 300 and the substrate 100 are formed integrally, so that no additional separate manufacturing of the reflective structure 300 is needed, the process flow can be simplified, and the production efficiency can be improved. It is understood that in other embodiments, when the reflective structure 300 protrudes toward the side away from the protective layer 400, the reflective structure 300 may be separately manufactured and separately formed.
Fig. 5 is a schematic top view of another backlight module according to an embodiment of the present invention, fig. 6 is a schematic cross-sectional view along a sectional line BB 'in fig. 5, fig. 7 is another schematic cross-sectional view along a sectional line BB' in fig. 5, and referring to fig. 5 to fig. 7, optionally, the reflective structure 300 includes a first surface 31 and a second surface 32 opposite to each other in a direction perpendicular to a plane of the backlight module 10, and the first surface 31 is located on a side of the second surface 32 near the protective layer 400; the first surface 31 is provided with a reflective layer 600 on a side close to the protective layer 400.
When the reflective structure 300 protrudes toward the side close to the protective layer 400 or the reflective structure 300 protrudes toward the side far from the protective layer 400, the reflective layer 600 may be disposed on the surface of the reflective structure 300 close to the protective layer 400 by evaporation, i.e. the reflective layer 600 is disposed on the side of the first surface 31 close to the protective layer 400, and the light is reflected by the reflective structure 300 and the reflective layer 600, so as to enhance the reflection effect, further make the light exit uniformly from the gap area between the light emitting elements 200, thereby improving the brightness of the gap area and improving the uneven brightness of the backlight module 10.
Fig. 8 is a schematic cross-sectional view along line AA' in fig. 1, and as shown in fig. 8, the semi-transparent and semi-reflective structure 500 is optionally integrally formed with the protective layer 400.
In this embodiment, the semi-transparent and semi-reflective structure 500 is formed by the protective layer 400, so that no additional separate manufacturing of the semi-transparent and semi-reflective structure 500 is needed, and the method is simple and the cost is low. It should be understood that in other embodiments, the protective layer 400 may be formed first, and then the semi-transparent and semi-reflective structure 500 is formed on the surface of the protective layer 400 away from the substrate 100 by using a mold, i.e. the semi-transparent and semi-reflective structure 500 is made of the same material as the protective layer 400, so that the process is simplified and the cost is saved. In addition, a person skilled in the art may separately and additionally prepare the transflective structure 500 (refer to fig. 2) according to the need, and the materials of the transflective structure 500 and the protective layer 400 may be different.
Referring to fig. 1 and 2, alternatively, the half mirror structure 500 is orthogonally projected in the first direction Y as a quadrangle and orthogonally projected in the second direction X as a triangle; the first direction Y intersects with the direction of the plane of the backlight module 10, and the second direction X is parallel to the direction of the plane of the backlight module 10.
For example, referring to fig. 1 and 2, the three-dimensional structure of the half mirror structure 500 may be a rectangular pyramid, and in particular, the half mirror structure 500 may have a quadrilateral vertical projection along the first direction Y and a triangular vertical projection along the second direction X. The setting of the half-transparent and half-reflecting structure 500 is a rectangular pyramid with symmetrical structure, so that the side of the half-transparent and half-reflecting structure 500 facing the gap area is an inclined surface, so that part of light emitted by the light emitting element 200 is reflected to the gap area, and the position distribution of the reflecting structure 300 is designed correspondingly in the gap area, so that the light incident to the gap area is reflected by the reflecting structure 300 and emitted from the gap area through the cooperation of the half-transparent and half-reflecting structure 500 and the reflecting structure 300, thereby reducing the brightness of the area where the light emitting element 200 is located, improving the brightness of the gap area, reducing the brightness difference, improving the uneven brightness problem of the backlight module 10 and improving the light emitting uniformity of the backlight module 10.
Fig. 9 is a schematic top view of a backlight module according to another embodiment of the present invention, and fig. 10 is a schematic cross-sectional view taken along a section line CC' in fig. 9, referring to fig. 9 and 10, optionally, the half-transparent half-reflective structure 500 includes a plurality of side surfaces 51, and one or more prism structures 700 are disposed on a side of each side surface 51 away from the substrate 100; the perpendicular projection of the prismatic structure 700 onto the substrate 100 overlaps with the perpendicular projection of the reflective structure 300 onto the substrate 100.
For example, referring to fig. 9 and 10, in order to better improve the problem of uneven brightness, one or more prism structures 700 may be disposed at the side 51 of the transflective structure 500, and one or more prism structures 700 may be disposed at the side of the reflective structure 300 away from the substrate 100, the one or more prism structures 700 may form a saw-tooth-like shape on the projection of the side 51, and the prism structures 700 may be disposed corresponding to the reflective structure 300, i.e., the vertical projection of the prism structures 700 on the substrate 100 overlaps the vertical projection of the reflective structure 300 on the substrate 100, so that the brightness of the gap region may be further improved by the cooperation of the prism structures 700 and the reflective structure 300. Specifically, the light is reflected by the reflecting structure 300 and then enters the prism structure 700 above the reflecting structure 300, the prism structure 700 can reflect and refract the light entering the prism structure 300 for multiple times, and the times of reflection and refraction are increased, so that the light utilization rate is improved, and meanwhile, the light emitting angle is also reduced, so that the light intensity of the area where the prism structure 700 is located, namely the gap area, can be improved, the brightness difference between the area where the light emitting element 200 is located and the gap area is further balanced, and the light emitting uniformity of the backlight module 10 is improved.
It should be noted that, in the actual process, the prism structure 700 may be directly formed on the side surface 51 of the half-transparent half-reflecting structure 500 by using a mold, that is, the prism structure 700 may also be formed by the protective layer 400, so that no additional separate manufacturing of the prism structure 700 is required, the process may be simplified, and the cost may be saved. It is understood that the prism structure 700 may be separately and additionally manufactured, and the materials of the prism structure 700 and the materials of the half mirror structure 500 and the protective layer 400 may be different.
Referring to fig. 9 and 10, alternatively, the vertical projection of the prism structure 700 on the substrate 100 does not overlap with the vertical projection of the light emitting element 200 on the substrate 100.
Since the brightness of the area where the light emitting elements 200 are located is generally higher and the brightness of the gap area between the light emitting elements 200 is lower, the prism structure 700 may be disposed only at the position corresponding to the reflective structure 300 in the gap area, and the prism structure 700 does not need to be disposed at the position corresponding to the light emitting elements 200, so as to increase the brightness of the gap area, reduce the brightness of the area where the light emitting elements 200 are located, and improve the uneven brightness.
Fig. 11 is a schematic top view of a backlight module according to an embodiment of the present invention, fig. 12 is a schematic cross-sectional view taken along a line DD' in fig. 11, and fig. 13 is a schematic top view of an annular prism structure according to an embodiment of the present invention, and referring to fig. 11 to fig. 13, optionally, a plurality of prism structures 700 located on different sides 51 and having a vertical distance h3 from the substrate 100 are connected to form an annular prism structure 71; the plurality of annular prism structures 71 form a plurality of annular structures 72 sharing a geometric center in a vertical projection of the substrate 100; the annular prism structure 71 is projected as a triangle in cross section in its extending direction E.
Specifically, if the vertical distance h3 between the same prism structure 700 on the same side 51 of the half mirror structure 500 and the substrate 100 is equal, a plurality of stripe-shaped prism structures 700 on different sides 51 of the half mirror structure 500 and equal to the vertical distance h3 between the two prism structures 100 may be connected to form a ring-shaped prism structure 71, and the ring-shaped prism structure 71 is projected as a ring-shaped structure 72 on the vertical direction of the substrate 100. Referring to fig. 13, the cross section of the annular prism structure 71 at the section line OO 'passing through the geometric center O point thereof is triangular, that is, the cross section of the annular prism structure 71 along the extending direction E thereof is projected as a triangle, wherein the extending direction E can be understood as a direction intersecting the section line OO', that is, when the annular prism structure 71 is circular, the extending direction E is a tangential direction of the annular prism structure 71. The annular prism structure 71 can omnidirectionally reflect and refract the light reflected by the reflecting structure 300 for multiple times, so that the light in the gap area is more uniform, and the light emitting uniformity of the backlight module 10 is improved.
Further, referring to fig. 11, when a plurality of prism structures 700 are disposed on each side 51 of the half mirror structure 500, the vertical projection of all the prism structures 700 or the plurality of annular prism structures 71 on the substrate 100 may form a plurality of annular structures 72 sharing a geometric center. By reasonably designing the number and layout of the prism structures 700 or the annular prism structures 71, the light homogenizing effect of the gap area can be further enhanced, and the light emitting uniformity of the backlight module 10 can be improved.
It should be noted that, fig. 11 and fig. 13 only show that the projection edge of the annular prism structure 71 is circular, which is not limited, and the shape of the annular prism structure 71 is related to the three-dimensional structure of the half-transparent half-reflecting structure 500, and a worker in the art may design according to practical working requirements, for example, the projection edge of the annular prism structure 71 may be any shape such as a polygon, and any shape capable of improving the brightness unevenness and improving the overall display effect is within the scope of the present invention. In addition, the shape and angle of the serrations in the prism structure 700 shown in fig. 12 are merely examples, and any shape and angle that facilitates light gathering and brightness enhancement in the gap region may be used.
Referring to fig. 11 and 12, alternatively, the perpendicular projection of the prismatic structure 700 onto the substrate 100 covers at least the perpendicular projection of the reflective structure 300 onto the substrate 100.
In order to better realize the transition of brightness between the area where the light emitting element 200 is located and the gap area, so that the brightness is more uniform, besides the prism structure 700 is arranged at the position corresponding to the reflecting structure 300, the prism structure 700 can be correspondingly arranged at other positions in the gap area, so that the transition of brightness is realized, and the starlike phenomenon is improved.
Fig. 14 is an enlarged partial schematic view of the ring structure group in fig. 11, and referring to fig. 11 and 14, alternatively, a plurality of ring structures 72 sharing a geometric center form a group of ring structure groups 73, and the distances h4 between any two adjacent ring structures 72 in the same group of ring structure groups 73 are equal.
By arranging the same annular structure group 73, the distances h4 between any two adjacent annular structures 72 are equal, so that the annular prism structures 72 are uniformly distributed in the gap area, thereby being beneficial to further realizing uniform transition of brightness between the area where the light-emitting element 200 is positioned and the gap area and improving the light emitting uniformity of the backlight module 10.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, and fig. 15 is a schematic structural diagram of the display device provided by the embodiment of the present invention, as shown in fig. 15, the display device 20 includes the backlight module 10 provided by any embodiment of the present invention, and has corresponding functions and beneficial effects of the backlight module 10.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (13)
1. A backlight module, comprising:
a substrate;
a plurality of light emitting elements arranged in an array and a plurality of reflecting structures positioned at one side of the substrate, wherein the reflecting structures are positioned in a gap area between the light emitting elements, and the gap area at least partially surrounds the light emitting elements;
the protective layer is positioned on one side of the substrate, is positioned on the same side as the light-emitting element, and covers the vertical projection of the light-emitting element on the substrate in the vertical projection of the protective layer on the substrate; a plurality of semi-transparent and semi-reflective structures are arranged on one side, away from the light-emitting element, of the protective layer, the vertical projection of the semi-transparent and semi-reflective structures on the substrate overlaps with the vertical projection of the light-emitting element on the substrate, and the projection area of the semi-transparent and semi-reflective structures on the substrate is gradually reduced along the light emitting direction of the backlight module;
the vertical projection of the semi-transparent and semi-reflective structure along the first direction is quadrilateral and the vertical projection along the second direction is triangular; the first direction is intersected with the direction of the plane of the backlight module, and the second direction is parallel to the direction of the plane of the backlight module;
the semi-transparent and semi-reflective structure comprises a plurality of side surfaces, and one side of each side surface, which is far away from the substrate, is provided with one or more prism structures;
the vertical projection of the prism structure on the substrate overlaps with the vertical projection of the reflection structure on the substrate.
2. A backlight module according to claim 1, wherein the substrate is integrally formed with the reflective structure.
3. A backlight module according to claim 1, wherein the geometric center lines of the vertical projection of four light emitting elements on the substrate in any two adjacent rows and two columns form a quadrilateral, and one of the reflecting structures is located at the geometric center of one of the quadrilateral.
4. A backlight module according to claim 1, wherein the reflective structure is convex towards a side close to the protective layer.
5. A backlight module according to claim 4, wherein a vertical distance between a surface of the light emitting element away from the substrate and the substrate is greater than a maximum vertical distance between the reflective structure and the substrate.
6. A backlight module according to claim 1, wherein the reflective structure is convex towards a side remote from the protective layer.
7. A backlight module according to claim 4 or 6, wherein the reflecting structure comprises a first surface and a second surface which are oppositely arranged in a direction perpendicular to a plane of the backlight module, and the first surface is positioned at one side of the second surface close to the protective layer;
and a reflecting layer is arranged on one side of the first surface, which is close to the protective layer.
8. A backlight module according to claim 1, wherein the semi-transparent and semi-reflective structure is integrally formed with the protective layer.
9. A backlight module according to claim 1, wherein the vertical projection of the prism structure on the substrate does not overlap with the vertical projection of the light emitting element on the substrate.
10. The backlight module according to claim 1, wherein a plurality of the prism structures located at different sides and having equal vertical distances from the substrate are connected to form an annular prism structure;
and the vertical projection of the annular prism structures on the substrate forms a plurality of annular structures sharing the geometric center, and the cross section projection of the annular prism structures in the extending direction is triangular.
11. A backlight module according to claim 10, wherein the vertical projection of the prismatic structure onto the substrate at least covers the vertical projection of the reflective structure onto the substrate.
12. A backlight module according to claim 11, wherein a plurality of the annular structures sharing a geometric center form a group of annular structures, and the spacing between any two adjacent annular structures in the same group of annular structures is equal.
13. A display device comprising a backlight module according to any one of claims 1-12.
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| CN114967238B (en) * | 2022-07-26 | 2023-01-03 | 惠科股份有限公司 | Display device, backlight module and control method thereof |
| CN115808821A (en) * | 2022-11-29 | 2023-03-17 | 维沃移动通信有限公司 | Backlight module, display device and electronic equipment |
| CN115685625B (en) * | 2022-11-30 | 2024-05-07 | 武汉天马微电子有限公司 | Backlight module and display device |
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