CN113885254A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113885254A CN113885254A CN202111269209.4A CN202111269209A CN113885254A CN 113885254 A CN113885254 A CN 113885254A CN 202111269209 A CN202111269209 A CN 202111269209A CN 113885254 A CN113885254 A CN 113885254A
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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
- G02F1/133603—Direct backlight with LEDs
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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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Abstract
The invention discloses a backlight module and a display device, relating to the technical field of display, wherein the backlight module comprises: a substrate; the light-emitting units are positioned on one side of the substrate, which faces the light-emitting surface of the backlight module, and are arranged in an array; the light ray adjusting film is positioned on one side of the light-emitting unit, which is far away from the substrate; the first reflecting layer is positioned between the substrate and the light ray adjusting film, and the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module; the light ray adjusting film comprises a base film and a second reflecting layer arranged on one side of the base film, the reflecting surface of the second reflecting layer faces the backlight surface of the backlight module, and the vertical projection of the second reflecting layer on the substrate is at least partially overlapped with the vertical projection of the light emitting unit on the substrate. The invention solves the technical problem of uneven brightness of the backlight module in the prior art.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
The backlight module has an important application in the display technology field, and Light Emitting Diodes (LEDs) have a very wide application as a Light source of the backlight module due to advantages of high Light Emitting efficiency, low power consumption, wide color gamut, long service life, and the like.
Currently, backlight modules in the market can be roughly divided into a direct type backlight and a side type backlight. The side-in backlight is that the LED is arranged at the side edge of the light guide plate, the linear light source is converted into the light source through the light guide plate, and the light of the surface light source is homogenized through a series of optical films. The LEDs of the direct type backlight are arranged in a matrix and disposed right under the display panel to directly form a surface light source. However, in the direct type backlight, due to the array arrangement of the LEDs, a gap (gap) exists between two adjacent LEDs, and the light emitting angle of each LED is limited, so that the brightness of the front surface of the LED is the highest, and a dark situation may appear in the gap portion due to fewer light sources, which causes a phenomenon that a bright area and a dark area are alternately distributed on the display panel, that is, the display effect of the display screen appears a starry phenomenon.
Disclosure of Invention
In view of the above, the present invention provides a backlight module and a display device to solve the technical problem of uneven brightness of the backlight module in the prior art.
The invention provides a backlight module, comprising: a substrate; the light-emitting units are positioned on one side of the substrate, which faces the light-emitting surface of the backlight module, and are arranged in an array; the light ray adjusting film is positioned on one side of the light-emitting unit, which is far away from the substrate; the first reflecting layer is positioned between the substrate and the light ray adjusting film, and the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module; the light ray adjusting film comprises a base film and a second reflecting layer arranged on one side of the base film, the reflecting surface of the second reflecting layer faces the backlight surface of the backlight module, and the vertical projection of the second reflecting layer on the substrate is at least partially overlapped with the vertical projection of the light emitting unit on the substrate.
Based on the same idea, the invention also provides a display device which comprises the backlight module.
Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module provided by the invention comprises a light ray adjusting film and a first reflecting layer. The light adjusting film is located on one side, far away from the substrate, of the light emitting unit, the first reflection layer is located between the substrate and the light adjusting film, the light adjusting film comprises a base film and a second reflection layer arranged on one side of the base film, the reflection surface of the second reflection layer faces the backlight surface of the backlight module, the vertical projection of the second reflection layer on the substrate is at least partially overlapped with the vertical projection of the light emitting unit on the substrate, the reflection surface of the first reflection layer faces the light emitting surface of the backlight module, at least part of light emitted by the light emitting unit is reflected to the reflection surface of the first reflection layer through the second reflection layer, then the light is reflected through the first reflection layer again, and finally the light is emitted from the light emitting surface of the backlight module. The light emitted by the light emitting unit can be scattered through the first reflecting layer and the second reflecting layer, so that the light emitted by the backlight module is uniformly distributed, and the problem of nonuniform brightness of the backlight module in the prior art is solved.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic plan view of a backlight module according to the present invention;
FIG. 2 is a cross-sectional view of the backlight module of FIG. 1 taken along line A-A';
FIG. 3 is a partial schematic view of another backlight module according to the present invention;
FIG. 4 is a partial schematic view of another backlight module according to the present invention;
FIG. 5 is a partial schematic view of another backlight module according to the present invention;
FIG. 6 is a partial schematic view of another backlight module according to the present invention;
FIG. 7 is another cross-sectional view taken along A-A' of the backlight module shown in FIG. 1;
FIG. 8 is a cross-sectional view of the backlight module of FIG. 1 taken along line A-A';
FIG. 9 is a schematic plan view of a display device according to the present invention;
fig. 10 is a cross-sectional view of the display device of fig. 9 taken along B-B'.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic plan view of a backlight module according to the present invention, fig. 2 is a cross-sectional view of the backlight module shown in fig. 1 along a-a', and referring to fig. 1 and fig. 2, the present embodiment provides a backlight module for providing a light source to a display panel. The backlight module includes a substrate 10 and a plurality of light emitting units 20, and the light emitting units 20 emit light. The light emitting units 20 are located on one side of the substrate 10 facing the light emitting surface of the backlight module, and the plurality of light emitting units 20 are arranged in an array, so that the number of the light emitting units 20 can be increased, thereby increasing the light emitting brightness of the backlight module and improving the light emitting effect of the backlight module. Optionally, the light emitting units 20 may be arranged in an array along the row direction and the column direction of the substrate 10, so as to facilitate partition regulation and control of the light emitting units 20, for example, the light emitting units 20 arranged in the array are divided into a plurality of dimming areas, so that regulation and control of the light emitting brightness of each dimming area is easily achieved.
The backlight module further includes a light adjusting film 30 and a first reflective layer 40. The light adjusting film 30 is located on a side of the light emitting unit 20 away from the substrate 10, and the first reflective layer 40 is located between the substrate 10 and the light adjusting film 30, wherein the light adjusting film 30 includes a base film 31 and a second reflective layer 32 disposed on a side of the base film 31, a reflective surface of the second reflective layer 32 faces a backlight surface of the backlight module, a vertical projection of the second reflective layer 32 on the substrate 10 at least partially overlaps a vertical projection of the light emitting unit 20 on the substrate 10, a reflective surface of the first reflective layer 40 faces a light exit surface of the backlight module, at least a portion of light emitted by the light emitting unit 20 is reflected to the reflective surface of the first reflective layer 40 by the second reflective layer 32, and then is reflected by the first reflective layer 40 again and finally exits from the light exit surface of the backlight module. The light emitted from the light emitting unit 20 can be scattered by the first reflective layer 40 and the second reflective layer 32, so that the light emitted from the backlight module is uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
It should be noted that, in an actual implementation process, the number of the light emitting units 20 in the backlight module may be many, and in fig. 1, for convenience of illustration, only a small number of the light emitting units 20 are exemplarily shown, but in an actual implementation process, the number and the arrangement manner of the light emitting units 20 may be determined according to an actual application environment, and the present invention is not limited thereto.
Optionally, in the light adjusting film 30, the base film 31 may be made of a pet (polyethylene terephthalate) material or a pc (polycarbonate) material, the reflective material is coated, printed, attached, or plated on the base film 31 to form the second reflective layer 32, and the material of the second reflective layer 32 may be a reflective metal material, for example, silver, aluminum, or the like.
In some alternative embodiments, the light emitting unit 20 is a Mini-LED (sub-millimeter light emitting diode) or a Micro-LED (Micro light emitting diode). It should be noted that, in this embodiment, the light emitting element 20 is exemplarily shown to be a Mini-LED or a Micro-LED, in other embodiments of the present invention, the light emitting element 20 may also be other types of LED chips, which is not described herein again.
With continued reference to fig. 1 and 2, in some alternative embodiments, the second reflective layer 32 includes a plurality of reflective structures 320, one reflective structure 320 corresponds to one light emitting unit 20, that is, in the backlight module, there is at least one light emitting unit 20 corresponding to one reflective structure 320. It should be noted that in the backlight module, each light emitting unit 20 may have one corresponding reflection structure 320, or some light emitting units 20 may have one corresponding reflection structure 320, and some light emitting units 20 do not correspond to the reflection structure 320.
The vertical projection of the reflective structure 320 on the substrate 10 and the vertical projection of the corresponding light emitting unit 20 on the substrate 10 at least partially overlap. At least part of the light emitted by the light emitting unit 20 in the backlight module is reflected to the reflective surface of the first reflective layer 40 by the reflective structure 320 corresponding thereto, and then reflected by the first reflective layer 40 again, and the light reflected again is emitted from the gap between two adjacent reflective structures 320, and finally emitted from the light emitting surface of the backlight module. The light emitted from the light emitting unit 20 can be scattered by the reflective structures 320 in the first reflective layer 40 and the second reflective layer 32, so that the light emitted from the backlight module is uniformly distributed, thereby solving the problem of non-uniform brightness of the backlight module in the prior art.
With reference to fig. 1 and fig. 2, in some optional embodiments, one of the reflective structures 320 includes a first reflective structure 321, and the light emitted from the light emitting unit 20 is transmitted to the corresponding first reflective structure 321, then reflected to the first reflective layer 40 by the first reflective structure 321, and then reflected by the first reflective layer 40 again, and finally emitted from the light emitting surface of the backlight module.
Before the light adjusting film 30 and the first reflective layer 40 are adjusted, the amount of light in the area of the backlight module corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 is the largest. The vertical projection of the first reflection structure 321 on the substrate 10 and the vertical projection of the corresponding light-emitting unit 20 on the substrate 10 are at least partially overlapped, the light in the region with the largest light amount can be reflected by the first reflection structure 321, the reflected light is reflected again by the first reflection layer 40, and the reflected light is emitted from the region of the light adjustment film 30 where the reflection structure 320 is not disposed, and finally emitted from the light-emitting surface of the backlight module. That is, the light in the region with the largest light amount can be reflected by the first reflection structure 321, and then the light emitted by the light emitting unit 20 can be scattered by the first reflection layer 40, so that the light is prevented from being concentrated in a certain region, and the light emitted by the backlight module is uniformly distributed, thereby solving the problem of uneven brightness of the backlight module in the prior art.
With continued reference to fig. 1 and fig. 2, in some optional embodiments, the vertical projection of the light emitting unit 20 on the substrate 10 is located in the vertical projection of the corresponding first reflecting structure 321 on the substrate 10, that is, along the direction perpendicular to the plane of the substrate 10, the first reflecting structure 321 covers the corresponding light emitting unit 20, so that the area of the first reflecting structure 321 for adjusting the area with more light quantity is increased, the light emitted by the backlight module is more uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
Fig. 3 is a partial schematic view of another backlight module provided in the present invention, and referring to fig. 3, in some alternative embodiments, one of the reflective structures 320 further includes a second reflective structure 322, and in the same reflective structure 320, the second reflective structure 322 is disposed around the first reflective structure 321. Before the light adjusting film 30 and the first reflective layer 40 are adjusted, the amount of light in the area of the backlight module corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 is the largest, and the amount of light gradually decreases along the direction gradually away from the light emitting unit 20, that is, the amount of light in the edge area of the backlight module surrounding the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 is larger. The reflection structure 320 further includes a second reflection structure 322 surrounding the first reflection structure 321, the second reflection structure 322 can at least partially reflect light in the region with a large amount of light, the reflected light is reflected again by the first reflection layer 40, and the light reflected again is emitted from the region of the light adjustment film 30 where the reflection structure 320 is not disposed, and is finally emitted from the light emitting surface of the backlight module. The light in the area with a large light quantity can be adjusted through the second reflection structure 322, so that the problem that the brightness of the area is large due to the fact that the light quantity of the area is large is avoided, and the light emitted by the backlight module is further enabled to be distributed uniformly, so that the problem that the brightness of the backlight module in the prior art is uneven is solved.
With continued reference to fig. 3, in some alternative embodiments, one second reflective structure 322 includes a plurality of first reflective sub-portions 3221, the plurality of first reflective sub-portions 3221 being arranged around the first reflective structure 321, the first reflective sub-portions 3221 being smaller in size than the first reflective structure 321. The light in the area with a large amount of light can be partially reflected by the plurality of first reflective sub-portions 3221 in the second reflective structure 322, the reflected light is reflected again by the first reflective layer 40, and the light reflected again is emitted from the area of the light adjusting film 30 where the reflective structure 320 is not disposed, and finally emitted from the light emitting surface of the backlight module. That is, the second reflection structure 322 adjusts the light in the area with a large amount of light through the plurality of first reflection sub-portions 3221, so as to avoid the problem that the luminance of the area is large due to the large amount of light in the area, and further, the light emitted by the backlight module is uniformly distributed, thereby solving the problem of the backlight module in the prior art that the luminance is non-uniform.
With continued reference to fig. 3, in some alternative embodiments, the plurality of light emitting units 20 are arranged in an array along a first direction X and a second direction Y, the first direction X and the second direction Y intersecting. Optionally, the first direction X and the second direction Y are perpendicular.
In the same reflective structure 320, the arrangement density of the first reflective sub-sections 3221 located between two adjacent light emitting cells 20 arranged in the first direction X is d1, i.e., the arrangement density of the first reflective sub-sections 3221 located within the pitch q1 between two adjacent light emitting cells 20 arranged in the first direction X is d 1; the arrangement density of the first reflector sections 3221 located between two adjacent light emitting units 20 arranged in the second direction Y is d2, that is, the arrangement density of the first reflector sections 3221 located within the pitch q2 between two adjacent light emitting units 20 arranged in the second direction Y is d 2; the arrangement density of the first reflector sections 3221 located between two adjacent light emitting units 20 arranged in the third direction Z1 is d3, that is, the arrangement density of the first reflector sections 3221 located within the pitch q3 between two adjacent light emitting units 20 arranged in the third direction Z1 is d 3; the arrangement density of the first reflector sections 3221 located between adjacent two of the light emitting cells 20 arranged in the fourth direction Z2 is d4, that is, the arrangement density of the first reflector sections 3221 located within the pitch q4 between adjacent two of the light emitting cells 20 arranged in the fourth direction Z2 is d 4; any two directions of the first direction X, the second direction Y, the third direction Z1 and the fourth direction Z2 intersect. d1 ═ d2 > d3 ═ d4, that is, in the same reflective structure 320, the arrangement density of the first reflector segments 3221 between two adjacent light-emitting units 20 arranged in the first direction X and the arrangement density of the first reflector segments 3221 between two adjacent light-emitting units 20 arranged in the second direction Y are large, and the arrangement density of the first reflector segments 3221 within the pitch q3 between two adjacent light-emitting units 20 arranged in the third direction Z1 and the arrangement density of the first reflector segments 3221 within the pitch q4 between two adjacent light-emitting units 20 arranged in the fourth direction Z2 are small. Since the length of the pitch q1 in the first direction X between the adjacent two light emitting cells 20 arranged in the first direction X and the length of the pitch q2 in the second direction Y between the adjacent two light emitting cells 20 arranged in the second direction Y are both smaller than the length of the pitch q3 in the third direction Z1 between the adjacent two light emitting cells 20 arranged in the third direction Z1 and the length of the pitch q4 in the fourth direction Z2 between the adjacent two light emitting cells 20 arranged in the fourth direction Z2, the amounts of light in the pitch q1 between adjacent two light emitting cells 20 arranged in the first direction X and the pitch q2 between adjacent two light emitting cells 20 arranged in the second direction Y are larger than the amounts of light in the pitch q3 between adjacent two light emitting cells 20 arranged in the third direction Z1 and the pitch q4 between adjacent two light emitting cells 20 arranged in the fourth direction Z2. By being disposed in the same reflection structure 320, the arrangement density of the first reflection sub-sections 3221 between the adjacent two light emitting units 20 arranged in the first direction X and the arrangement density of the first reflection sub-sections 3221 between the adjacent two light emitting units 20 arranged in the second direction Y are greater than the arrangement density of the first reflection sub-sections 3221 within the pitch q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 and the arrangement density of the first reflection sub-sections 3221 within the pitch q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2, therefore, the light rays in the region with a large light ray amount and the region with a small light ray amount are differentially adjusted through the plurality of first reflection sub-portions 3221 in the second reflection structure 322, so that the light rays emitted by the backlight module are further uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
Fig. 4 is a partial schematic view of another backlight module provided by the present invention, referring to fig. 4, in some optional embodiments, one second reflection structure 322 further includes a plurality of second reflection sub-portions 3222, the plurality of second reflection sub-portions 3222 are arranged around the first reflection structure 321, the first reflection sub-portion 3221 is located between the first reflection structure 321 and the second reflection sub-portion 3222, the size of the second reflection sub-portion 3222 is smaller than the size of the first reflection sub-portion 3221, and the second reflection sub-portion 3222 can be used to further fine-tune light in an area corresponding to the second reflection structure 322. That is, the light rays in the region with a large amount of light rays can be further finely adjusted by the plurality of second reflective sub-portions 3222 in the second reflective structure 322, so that the light rays emitted by the backlight module are further uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
Optionally, the arrangement manner of the plurality of second reflection sub-portions 3222 in the second reflection structure 322 may refer to the arrangement manner of the plurality of first reflection sub-portions 3221 in the second reflection structure 322 in the embodiment of the present invention, so that the light in the region with a large light amount and the light in the region with a small light amount are adjusted differently, which is not described herein again.
Fig. 5 is a partial schematic view of another backlight module provided by the present invention, and referring to fig. 5, in some alternative embodiments, a plurality of light emitting units 20 are arranged in an array along a first direction X and a second direction Y, where the first direction X and the second direction Y intersect. Optionally, the first direction X and the second direction Y are perpendicular.
One reflective structure 320 further includes a plurality of third reflective structures 323, the plurality of third reflective structures 323 are arranged around the first reflective structure 321, the second reflective structure 322 is located between the first reflective structure 321 and the third reflective structure 323, and the third reflective structure 323 has a size smaller than that of the first reflective structure 321. The third reflective structure 323 can reflect the light transmitted to the reflective surface of the third reflective structure 323, the reflected light is reflected again by the first reflective layer 40, and the reflected light is emitted from the area of the light adjusting film 30 where the reflective structure 320 is not disposed, and finally emitted from the light emitting surface of the backlight module. That is, the third reflective structure 323 in the reflective structure 320 can be used to adjust light in an area with a large amount of light.
The perpendicular projection of the third reflective structure 323 on the substrate 10 is located between the perpendicular projections of the adjacent two light-emitting units 20 arranged along the first direction X on the substrate 10, i.e., the perpendicular projection of the third reflective structure 323 on the substrate 10 is located within the perpendicular projection of the gap q1 between the adjacent two light-emitting units 20 arranged along the first direction X on the substrate 10, and/or the perpendicular projection of the third reflective structure 323 on the substrate 10 is located between the perpendicular projections of the adjacent two light-emitting units 20 arranged along the second direction Y on the substrate, i.e., the perpendicular projection of the third reflective structure 323 on the substrate 10 is located within the perpendicular projection of the gap q2 between the adjacent two light-emitting units 20 arranged along the second direction Y on the substrate 10. The light quantity of the region corresponding to the gap q1 between two adjacent light-emitting units 20 arranged along the first direction X and/or the region corresponding to the gap q2 between two adjacent light-emitting units 20 arranged along the second direction Y is relatively large, and accordingly, the third reflective structure 323 can be arranged in the region corresponding to the gap q1 between two adjacent light-emitting units 20 arranged along the first direction X and/or the region corresponding to the gap q2 between two adjacent light-emitting units 20 arranged along the second direction Y, and the region with relatively large light quantity can be adjusted through the third reflective structure 323, so that the light emitted by the backlight module is further uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
With reference to fig. 5, in some optional embodiments, the vertical projection pattern of the light emitting unit 20 on the substrate 10 is square, accordingly, the vertical projection pattern of the first reflective structure 321 on the substrate 10 is square or circular, before the adjustment of the light adjusting film 30 and the first reflective layer 40, the amount of light in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 in the backlight module is the largest, and the first reflective structure 321 adopts the shape corresponding to the shape of the light emitting unit 20, which is beneficial for reflecting the light in the area with the largest amount of light through the first reflective structure 321, so as to avoid concentrating the light in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 in the backlight module, so that the light emitted by the backlight module is uniformly distributed, thereby solving the problem of non-uniform brightness of the backlight module in the prior art.
It should be noted that, in the present embodiment, the vertical projection pattern of the first reflective structure 321 on the substrate 10 is exemplarily shown to be a square or a circle, in other embodiments of the present invention, the vertical projection pattern of the first reflective structure 321 on the substrate 10 may also be arranged to be a star, a polygon, etc. according to actual production requirements, and the present invention is not described herein one by one.
With continued reference to fig. 5, in some alternative embodiments, the distance between two adjacent light emitting units 20 arranged along the first direction X in the first direction X is d1, and the distance between two adjacent light emitting units 20 arranged along the second direction Y in the second direction Y is d2, where d1 is d 2. Thus, the amounts of light in the pitch q1 between the adjacent two light emitting cells 20 arranged in the first direction X and the pitch q2 between the adjacent two light emitting cells 20 arranged in the second direction Y are larger than the amounts of light in the pitch q3 between the adjacent two light emitting cells 20 arranged in the third direction Z1 and the pitch q4 between the adjacent two light emitting cells 20 arranged in the fourth direction Z2, that is, the pitch q1 between the adjacent two light emitting cells 20 arranged in the first direction X and the pitch q2 between the adjacent two light emitting cells 20 arranged in the second direction Y are both larger.
Part of the third reflective structures 323 are located between the vertical projections of the two adjacent light-emitting units 20 arranged along the first direction X on the substrate 10 in the vertical projection of the substrate 10, that is, the third reflective structures 323 are arranged in the region corresponding to the distance q1 between the two adjacent light-emitting units 20 arranged along the first direction X, and the light quantity in the region is adjusted through the third reflective structures 323, so that the light emitted by the backlight module is uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
Similarly, a part of the third reflective structure 323 is located between the vertical projections of the two adjacent light-emitting units 20 arranged along the second direction Y on the substrate 10 in the vertical projection of the substrate 10, that is, the third reflective structure 323 is arranged in the region corresponding to the distance q2 between the two adjacent light-emitting units 20 arranged along the second direction Y, and the light quantity in the region is adjusted by the third reflective structure 323, so that the light emitted by the backlight module is uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
Fig. 6 is a partial schematic view of another backlight module provided by the present invention, and referring to fig. 6, in some alternative embodiments, a vertical projection pattern of the light emitting unit 20 on the substrate 10 is rectangular, and correspondingly, a vertical projection pattern of the first reflective structure 321 on the substrate 10 is rectangular or elliptical. Before the light adjusting film 30 and the first reflection layer 40 are adjusted, the light quantity in the area of the backlight module corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 is the largest, the first reflection structure 321 adopts the shape corresponding to the shape of the light emitting unit 20, which is beneficial for reflecting the light in the area with the largest light quantity through the first reflection structure 321, and avoiding the light from concentrating in the area of the backlight module corresponding to the vertical projection of the light emitting unit 20 on the substrate 10, so that the light emitted by the backlight module is uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
It should be noted that, in the present embodiment, the vertical projection pattern of the first reflective structure 321 on the substrate 10 is exemplarily shown to be rectangular or elliptical, and in other embodiments of the present invention, the vertical projection pattern of the first reflective structure 321 on the substrate 10 may also be arranged to be star-shaped, polygonal, etc. according to actual production requirements, and the present invention is not described herein one by one.
With continued reference to fig. 6, in some alternative embodiments, the length of the vertical projection pattern of the light emitting cells 20 on the substrate in the first direction X is greater than the width thereof in the second direction Y, the distance between two adjacent light emitting cells 20 arranged along the first direction X in the first direction X is d3, and the distance between two adjacent light emitting cells 20 arranged along the second direction Y in the second direction Y is d4, wherein d3 > d 4. Accordingly, the amount of light within the pitch q1 between two adjacent light emitting cells 20 arranged in the first direction X is greater than the amount of light within the pitch q2 between two adjacent light emitting cells 20 arranged in the second direction Y, that is, the amount of light within the pitch q1 between two adjacent light emitting cells 20 arranged in the first direction X is greater.
The third reflective structure 323 is located between the vertical projections of the two adjacent light-emitting units 20 arranged along the first direction X on the substrate 10 in the vertical projection of the substrate 10, that is, the third reflective structure 323 is arranged in the region corresponding to the distance q1 between the two adjacent light-emitting units 20 arranged along the first direction X, and the light quantity in the region is adjusted by the third reflective structure 323, so that the light emitted by the backlight module is uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
With continued reference to fig. 2, in some alternative embodiments, the first reflective layer 40 is provided with a hollow portion 41, and the vertical projection pattern of the light emitting unit 20 on the substrate 10 is located within the vertical projection pattern of the hollow portion 41 on the substrate 10, so as to avoid the arrangement of the first reflective layer 40 from affecting the connection between the light emitting unit 20 and the circuit layer in the substrate 10.
Fig. 7 is another cross-sectional view of the backlight module shown in fig. 1 along a-a', referring to fig. 7, optionally, a vertical projection pattern of the light emitting unit 20 on the substrate 10 overlaps a vertical projection pattern of the hollow portion 41 on the substrate 10, so that the area of the hollow portion 41 in the first reflective layer 40 is reduced while the arrangement of the light emitting unit 20 is not affected, thereby increasing the area of the first reflective layer 40 for reflecting light, facilitating improvement of the amount of light emitted from the light emitting surface of the backlight module, and facilitating improvement of the light utilization rate. Note that, since the vertical projection pattern of the light emitting unit 20 on the substrate 10 overlaps the vertical projection pattern of the hollow portion 41 on the substrate 10, the hollow portion 41 is marked at the boundary between the first reflective layer 40 and the light emitting unit 20 in fig. 7. In the embodiments related to the present invention, the labeling manner of the hollow portion 41 is also applicable, and the description of the present invention is omitted.
Fig. 8 is a further cross-sectional view of the backlight module shown in fig. 1 along a-a', and referring to fig. 1 and 8, in some optional embodiments, the backlight module further includes a light-focusing sheet 50, the light-focusing sheet 50 is located on a side of the light-adjusting film 30 away from the substrate 10, and the light-focusing sheet 50 can be used for refracting light emitted from the light-adjusting film 30, improving the viewing angle distribution of the light, concentrating the light onto a front viewing angle, increasing the luminous flux of the front viewing angle, and increasing the utilization rate of the light.
Fig. 9 is a schematic plan view of a display device according to the present invention, fig. 10 is a cross-sectional view of the display device along B-B' of fig. 9, and referring to fig. 9 and fig. 10, the present embodiment provides a display device 1000 including the backlight module 100 according to the above embodiment of the present invention. The embodiment of fig. 9 only uses a mobile phone as an example to describe the display device 1000, and it should be understood that the display device 1000 provided in the embodiment of the present invention may also be other display devices 1000 having a display function, such as a computer, a television, a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1000 provided in the embodiment of the present invention has the beneficial effects of the backlight module 100 provided in the embodiment of the present invention, and specific reference may be made to the specific description of the backlight module 100 in the foregoing embodiments, and details of the embodiment are not repeated herein.
The display device further includes a display panel 200, the display panel 200 is located at a light emitting side of the backlight module 100, and the backlight module 100 is used for providing a light source for the display panel 200.
By the embodiment, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module provided by the invention comprises a light ray adjusting film and a first reflecting layer. The light adjusting film is located on one side, far away from the substrate, of the light emitting unit, the first reflection layer is located between the substrate and the light adjusting film, the light adjusting film comprises a base film and a second reflection layer arranged on one side of the base film, the reflection surface of the second reflection layer faces the backlight surface of the backlight module, the vertical projection of the second reflection layer on the substrate is at least partially overlapped with the vertical projection of the light emitting unit on the substrate, the reflection surface of the first reflection layer faces the light emitting surface of the backlight module, at least part of light emitted by the light emitting unit is reflected to the reflection surface of the first reflection layer through the second reflection layer, then the light is reflected through the first reflection layer again, and finally the light is emitted from the light emitting surface of the backlight module. The light emitted by the light emitting unit can be scattered through the first reflecting layer and the second reflecting layer, so that the light emitted by the backlight module is uniformly distributed, and the problem of nonuniform brightness of the backlight module in the prior art is solved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (17)
1. A backlight module, comprising:
a substrate;
the light-emitting units are positioned on one side of the substrate, which faces the light-emitting surface of the backlight module, and are arranged in an array;
the light ray adjusting film is positioned on one side, far away from the substrate, of the light emitting unit;
the first reflecting layer is positioned between the substrate and the light ray adjusting film, and the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module;
the light ray adjusting film comprises a base film and a second reflecting layer arranged on one side of the base film, the reflecting surface of the second reflecting layer faces the backlight surface of the backlight module, and the vertical projection of the second reflecting layer on the substrate is at least partially overlapped with the vertical projection of the light emitting unit on the substrate.
2. The backlight module according to claim 1,
the second reflecting layer comprises a plurality of reflecting structures, and one reflecting structure corresponds to one light emitting unit;
the vertical projection of the reflecting structure on the substrate and the vertical projection of the light-emitting unit corresponding to the reflecting structure on the substrate at least partially overlap.
3. The backlight module according to claim 2,
one of the reflecting structures comprises a first reflecting structure, and the vertical projection of the first reflecting structure on the substrate at least partially overlaps with the vertical projection of the corresponding light-emitting unit on the substrate.
4. The backlight module according to claim 3,
the vertical projection of the light-emitting unit on the substrate is positioned in the vertical projection of the first reflecting structure corresponding to the light-emitting unit on the substrate.
5. The backlight module according to claim 3,
one of the reflective structures further comprises a second reflective structure, and in the same reflective structure, the second reflective structure is disposed around the first reflective structure.
6. The backlight module according to claim 5,
one of the second reflective structures includes a plurality of first reflective subsections arranged around the first reflective structure;
the first reflector portion has a size smaller than a size of the first reflective structure.
7. The backlight module according to claim 6,
the plurality of light emitting units are arranged in an array along a first direction and a second direction, and the first direction and the second direction are intersected;
an arrangement density of the first reflector segment between adjacent two of the light emitting units arranged in the first direction is d1, an arrangement density of the first reflector segment between adjacent two of the light emitting units arranged in the second direction is d2, an arrangement density of the first reflector segment between adjacent two of the light emitting units arranged in the third direction is d3, an arrangement density of the first reflector segment between adjacent two of the light emitting units arranged in the fourth direction is d4, d 1-d 2 > d 3-d 4, wherein any two directions of the first direction, the second direction, the third direction and the fourth direction intersect.
8. The backlight module according to claim 6,
one of the second reflective structures further includes a plurality of second reflector segments arranged around the first reflective structure with the first reflector segment positioned between the first reflective structure and the second reflector segment;
the size of the second reflector sub-portion is smaller than the size of the first reflector sub-portion.
9. The backlight module according to claim 5,
the plurality of light emitting units are arranged in an array along a first direction and a second direction, and the first direction and the second direction are intersected;
one of the reflective structures further comprises a plurality of third reflective structures arranged around the first reflective structure, and the second reflective structure is located between the first reflective structure and the third reflective structure;
the size of the third reflecting structure is smaller than that of the first reflecting structure;
the vertical projection of the third reflecting structure on the substrate is positioned between the vertical projections of the two adjacent light-emitting units arranged along the first direction on the substrate, and/or the vertical projection of the third reflecting structure on the substrate is positioned between the vertical projections of the two adjacent light-emitting units arranged along the second direction on the substrate.
10. The backlight module according to claim 9,
the vertical projection pattern of the light-emitting unit on the substrate is square;
the vertical projection pattern of the first reflecting structure on the substrate is square or circular.
11. The backlight module according to claim 10,
a distance between two adjacent light emitting units arranged along the first direction is the same as a distance between two adjacent light emitting units arranged along the second direction;
a part of the vertical projection of the third reflecting structure on the substrate is positioned between the vertical projections of the two adjacent light-emitting units arranged along the first direction on the substrate;
and the vertical projection of part of the third reflecting structure on the substrate is positioned between the vertical projections of the two adjacent light-emitting units arranged along the second direction on the substrate.
12. The backlight module according to claim 9,
the vertical projection pattern of the light-emitting unit on the substrate is rectangular;
the vertical projection pattern of the first reflecting structure on the substrate is rectangular or elliptical.
13. The backlight module according to claim 12,
the length of the vertical projection pattern of the light-emitting unit on the substrate in the first direction is larger than the width of the vertical projection pattern of the light-emitting unit in the second direction;
the distance between two adjacent light-emitting units arranged along the first direction is smaller than the distance between two adjacent light-emitting units arranged along the second direction;
the vertical projection of the third reflecting structure on the substrate is positioned between the vertical projections of the two adjacent light-emitting units arranged along the first direction on the substrate.
14. The backlight module according to claim 1,
the first reflecting layer is provided with a hollow part, and the vertical projection pattern of the light-emitting unit on the substrate is positioned in the vertical projection pattern of the hollow part on the substrate.
15. The backlight module according to claim 1,
the backlight module further comprises a light-gathering piece, and the light-gathering piece is located on one side, deviating from the substrate, of the light adjusting film.
16. The backlight module according to claim 1,
the light emitting unit is a Mini-LED or a Micro-LED.
17. A display device, characterized in that the display device comprises a backlight module according to any one of claims 1-16.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111269209.4A CN113885254B (en) | 2021-10-29 | 2021-10-29 | Backlight module and display device |
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| CN202111269209.4A CN113885254B (en) | 2021-10-29 | 2021-10-29 | Backlight module and display device |
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| CN113885254A true CN113885254A (en) | 2022-01-04 |
| CN113885254B CN113885254B (en) | 2023-12-29 |
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| CN115963663A (en) * | 2022-12-29 | 2023-04-14 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
| WO2023168738A1 (en) * | 2022-03-10 | 2023-09-14 | 武汉华星光电技术有限公司 | Backlight module and display apparatus |
| CN117008377A (en) * | 2023-10-08 | 2023-11-07 | 合肥泰沃达智能装备有限公司 | Direct type backlight source with zero light mixing distance and display equipment using direct type backlight source |
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Also Published As
| Publication number | Publication date |
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| CN113885254B (en) | 2023-12-29 |
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