CN113885254B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113885254B CN113885254B CN202111269209.4A CN202111269209A CN113885254B CN 113885254 B CN113885254 B CN 113885254B CN 202111269209 A CN202111269209 A CN 202111269209A CN 113885254 B CN113885254 B CN 113885254B
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- 230000001105 regulatory effect Effects 0.000 description 3
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- 239000004417 polycarbonate Substances 0.000 description 2
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module and a display device, which relate 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 facing the light-emitting surface of the backlight module, and are arranged in an array; the light ray adjusting film is positioned at one side of the light emitting unit far away from the substrate; the first reflecting layer is positioned between the substrate and the light adjusting film, and the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module; the light adjusting film comprises a base film and a second reflecting layer arranged on one side of the base film, wherein the reflecting surface of the second reflecting layer faces to the backlight surface of the backlight module, and the vertical projection of the second reflecting layer on the substrate and the vertical projection of the light emitting unit on the substrate at least partially overlap. 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 important application in the technical field of display, and the light emitting diode (Light Emitting Diode, LED) has very wide application as a light source of the backlight module because of the advantages of high luminous efficiency, low power consumption, wide color gamut, long service life and the like.
Currently, backlight modules in the market can be roughly divided into direct type backlight and side-entry type backlight. The side-entry backlight is to arrange LEDs at the sides of a light guide plate, convert a linear light source into a light source through the light guide plate, and homogenize the light of a surface light source through a series of optical films. The LEDs of the direct type backlight are arranged in a matrix and disposed directly under the display panel to directly form a surface light source. However, due to the array arrangement mode of the LEDs, a gap exists between two adjacent LEDs, and the light emitting angle of each LED is limited, so that the brightness of the front face of the LED is the highest, the light source is less at the gap, and the bright area and the dark area are alternately distributed on the display panel, namely, the display effect of the display screen is the starlike 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 facing the light-emitting surface of the backlight module, and are arranged in an array; the light ray adjusting film is positioned at one side of the light emitting unit far away from the substrate; the first reflecting layer is positioned between the substrate and the light adjusting film, and the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module; the light adjusting film comprises a base film and a second reflecting layer arranged on one side of the base film, wherein the reflecting surface of the second reflecting layer faces to the backlight surface of the backlight module, and the vertical projection of the second reflecting layer on the substrate and the vertical projection of the light emitting unit on the substrate at least partially overlap.
Based on the same thought, 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 have the advantages that at least the following effects are realized:
the backlight module provided by the invention comprises a light adjusting film and a first reflecting layer. The light adjusting film is positioned on one side of the light emitting unit far away from the substrate, the first reflecting layer is positioned between the substrate and the light adjusting film, the light 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, the vertical projection of the second reflecting layer on the substrate and the vertical projection of the light emitting unit on the substrate are at least partially overlapped, the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module, and light emitted by the light emitting unit is at least partially reflected to the reflecting surface of the first reflecting layer through the second reflecting layer, then reflected again through the first reflecting layer and finally 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 uneven brightness of the backlight module in the prior art is solved.
Of course, it is not necessary for any one product to practice the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, 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 shown in FIG. 1 along A-A';
FIG. 3 is a schematic diagram of a portion of another backlight module according to the present invention;
FIG. 4 is a schematic diagram of a portion of a backlight module according to another embodiment of the invention;
FIG. 5 is a schematic diagram of a portion of a backlight module according to another embodiment of the invention;
FIG. 6 is a schematic diagram of a portion of a backlight module according to another embodiment of the invention;
FIG. 7 is another cross-sectional view of the backlight module shown in FIG. 1 along line A-A';
FIG. 8 is a further cross-sectional view of the backlight module shown in FIG. 1 along 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, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one 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 specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 is a schematic plan view of a backlight module according to the present invention, and fig. 2 is a cross-sectional view of the backlight module shown in fig. 1 along A-A', 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 comprises a substrate 10 and a plurality of light emitting units 20, wherein the light emitting units 20 are used for emitting light. The light emitting units 20 are arranged 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, the light emitting brightness of the backlight module is increased, and the light emitting effect of the backlight module is improved. Alternatively, 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 the zonal adjustment and control of the light emitting units 20, for example, the light emitting units 20 arranged in an array are divided into a plurality of dimming areas, so that the adjustment and control of the light emitting brightness of each dimming area is easy to be realized.
The backlight module further includes a light adjusting film 30 and a first reflective layer 40. The light adjusting film 30 is located at a side of the light emitting unit 20 away from the substrate 10, 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 at one 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 and a vertical projection of the light emitting unit 20 on the substrate 10 are at least partially overlapped, a reflective surface of the first reflective layer 40 faces a light emitting surface of the backlight module, and light emitted by the light emitting unit 20 is at least partially reflected by the second reflective layer 32 to the reflective surface of the first reflective layer 40, and then is reflected again by the first reflective layer 40, and finally emitted from the light emitting surface of the backlight module. The light emitted by the light emitting unit 20 can be scattered by the first reflecting layer 40 and the second reflecting layer 32, 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 actual implementation process, the number of the light emitting units 20 in the backlight module may be many, and in fig. 1, only a small number of the light emitting units 20 are shown for convenience of illustration, but in the actual implementation process, the number and arrangement manner of the light emitting units 20 may be determined according to the actual application environment, which is not particularly limited in the present invention.
Alternatively, in the light adjusting film 30, the material of the base film 31 may be PET (Polyethylene terephthalate) material or PC (Polycarbonate) material, and the second reflective layer 32 is formed by coating, printing, attaching or plating a reflective material on the base film 31, and the material of the second reflective layer 32 may be a reflective metal material, illustratively, 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 illustrated as a Mini-LED or a Micro-LED, and in other embodiments of the present invention, the light emitting element 20 may be other types of LED chips, which are not described herein.
With continued reference to fig. 1 and 2, in some alternative embodiments, the second reflective layer 32 includes a plurality of reflective structures 320, where one reflective structure 320 corresponds to one light emitting unit 20, i.e., 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, one reflective structure 320 may be corresponding to each light emitting unit 20, or one reflective structure 320 may be corresponding to a part of the light emitting units 20, and a part of the light emitting units 20 may not correspond to the reflective structure 320.
The vertical projection of the reflective structure 320 on the substrate 10 and the vertical projection of the light emitting unit 20 corresponding thereto on the substrate 10 at least partially overlap. At least part of the light rays emitted by the light emitting units 20 in the backlight module are reflected to the reflecting surface of the first reflecting layer 40 through the reflecting structures 320 corresponding to the light rays, then the light rays are reflected again through the first reflecting layer 40, the light rays after being reflected again are emitted from the gap between the two adjacent reflecting structures 320, and finally the light rays are emitted from the light emitting surface of the backlight module. The light emitted by 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 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. 1 and fig. 2, in some alternative embodiments, one of the reflective structures 320 includes a first reflective structure 321, and light emitted from the light emitting unit 20 is transmitted to the corresponding first reflective structure 321 and then reflected by the first reflective structure 321 to the first reflective layer 40, and then reflected again by the first reflective layer 40, and finally emitted from the light emitting surface of the backlight module.
Before being adjusted by the light adjusting film 30 and the first reflecting layer 40, the backlight module has the greatest amount of light in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10. The vertical projection of the first reflecting structure 321 on the substrate 10 and the vertical projection of the corresponding light emitting unit 20 on the substrate 10 at least partially overlap, the light in the area with the largest light quantity can be reflected by the first reflecting structure 321, the reflected light is reflected again by the first reflecting layer 40, and the light after the re-reflection is emitted from the area without the reflecting structure 320 in the light adjusting film 30, and finally is emitted from the light emitting surface of the backlight module. Namely, the first reflecting structure 321 can reflect the light in the area with the greatest light quantity, and then the first reflecting layer 40 can scatter the light emitted by the light emitting unit 20, so that the light is prevented from being concentrated in a certain area, 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. 1 and fig. 2, in some alternative 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 on which the substrate 10 is located, the first reflecting structure 321 covers the light emitting unit 20 corresponding thereto, so that the area of the first reflecting structure 321 for adjusting the area with a larger amount of light is increased, so that the light distribution emitted by the backlight module is more uniform, and the problem of uneven brightness of the backlight module in the prior art is solved.
Fig. 3 is a schematic view of a portion of another backlight module according to the present invention, and referring to fig. 3, in some alternative embodiments, a reflective structure 320 further includes a second reflective structure 322, where the second reflective structure 322 is disposed around the first reflective structure 321 in the same reflective structure 320. Before being adjusted by the light adjusting film 30 and the first reflecting layer 40, the backlight module has the greatest amount of light in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10, and gradually decreases in the direction gradually away from the light emitting unit 20, i.e. the backlight module has more light around the edge area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10. The reflective structure 320 further includes a second reflective structure 322 disposed around the first reflective structure 321, and the light in the area with a large amount of light can be at least partially reflected by the second reflective structure 322, and the reflected light is reflected again by the first reflective layer 40, and the light after being reflected again is emitted from the area of the light adjusting film 30 where the reflective structure 320 is not disposed, and finally is emitted from the light emitting surface of the backlight module. Namely, the second reflecting structure 322 can adjust the light in the area with more light quantity, so that the problem of uneven brightness of the backlight module in the prior art is solved, and the problem that the brightness of the area is larger due to the more light quantity of the area is avoided, and the light emitted by the backlight module is further distributed uniformly.
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 having a size smaller than the size of the first reflective structure 321. The light rays in the region with a large amount of light rays can be partially reflected by the plurality of first reflecting sub-portions 3221 in the second reflecting structure 322, the reflected light rays are reflected again by the first reflecting layer 40, and the light rays after the re-reflection are emitted from the region without the reflecting structure 320 in the light ray adjusting film 30, and finally are emitted from the light emitting surface of the backlight module. Namely, the second reflecting structure 322 is realized through the plurality of first reflecting sub-portions 3221 to adjust the light in the area with more light quantity, so that the larger brightness of the area caused by the more light quantity of the area is avoided, the light emitted by the backlight module is further distributed uniformly, and the problem of uneven brightness of the backlight module in the prior art is solved.
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, which intersect. Optionally, the first direction X and the second direction Y are perpendicular.
In the same reflecting structure 320, the arrangement density of the first reflecting sub-portions 3221 between the adjacent two light emitting units 20 arranged along the first direction X is d1, that is, the arrangement density of the first reflecting sub-portions 3221 within the interval q1 between the adjacent two light emitting units 20 arranged along the first direction X is d1; the arrangement density of the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the second direction Y is d2, that is, the arrangement density of the first reflective sub-portions 3221 within the interval q2 between the adjacent two light emitting units 20 arranged in the second direction Y is d2; the arrangement density of the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the third direction Z1 is d3, that is, the arrangement density of the first reflective sub-portions 3221 within the interval q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 is d3; the arrangement density of the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the fourth direction Z2 is d4, that is, the arrangement density of the first reflective sub-portions 3221 within the interval q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2 is d4; any two directions of the first direction X, the second direction Y, the third direction Z1 and the fourth direction Z2 are intersected. d1 In the same reflecting structure 320, the arrangement density of the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the first direction X and the arrangement density of the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the second direction Y are larger, and the arrangement density of the first reflective sub-portions 3221 within the interval q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 and the arrangement density of the first reflective sub-portions 3221 within the interval q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2 are smaller. Since the length of the interval q1 between the adjacent two light emitting units 20 arranged in the first direction X and the length of the interval q2 between the adjacent two light emitting units 20 arranged in the second direction Y are smaller than the length of the interval q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 and the length of the interval q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2, the amount of light in the interval q1 between the adjacent two light emitting units 20 arranged in the first direction X and the interval q2 between the adjacent two light emitting units 20 arranged in the second direction Y is larger than the amount of light in the interval q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 and the interval q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2. By arranging the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the first direction X and the first reflective sub-portions 3221 between the adjacent two light emitting units 20 arranged in the second direction Y in the same reflective structure 320, the arrangement density of the first reflective sub-portions 3221 in the interval q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 and the arrangement density of the first reflective sub-portions 3221 in the interval q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2 are greater than the arrangement density of the first reflective sub-portions 3221 in the first reflective structure, so that the light in the area with more light and the area with less light is differentially regulated by the plurality of first reflective sub-portions 3221 in the second reflective structure 322, and the light distribution emitted by the backlight module is further uniform, thereby solving the problem of uneven brightness of the backlight module in the prior art.
Fig. 4 is a schematic partial view of another backlight module according to the present invention, referring to fig. 4, in some alternative embodiments, one second reflective structure 322 further includes a plurality of second reflective sub-portions 3222, the plurality of second reflective sub-portions 3222 are arranged around the first reflective structure 321, the first reflective sub-portion 3221 is located between the first reflective structure 321 and the second reflective sub-portion 3222, the size of the second reflective sub-portion 3222 is smaller than that of the first reflective sub-portion 3221, and the second reflective sub-portion 3222 can be used to further fine-tune the light of the region corresponding to the second reflective structure 322. That is, the light rays in the area with more light rays can be further finely adjusted by the plurality of second reflecting sub-portions 3222 in the second reflecting structure 322, so that the light rays emitted by the backlight module are further distributed uniformly, 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 reflecting sub-portions 3222 in the second reflecting structure 322 may refer to the arrangement manner of the plurality of first reflecting sub-portions 3221 in the second reflecting structure 322 in the embodiment of the present invention, so that the light in the area with more light and the light in the area with less light are differentially adjusted, which is not described herein.
Fig. 5 is a schematic partial view of another backlight module according to 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.
The one reflecting structure 320 further includes a plurality of third reflecting structures 323, the plurality of third reflecting structures 323 are arranged around the first reflecting structure 321, and the second reflecting structure 322 is located between the first reflecting structure 321 and the third reflecting structure 323, and the size of the third reflecting structure 323 is smaller than the size of the first reflecting structure 321. The third reflecting structure 323 can reflect the light transmitted to the reflecting surface of the third reflecting structure 323, the reflected light is reflected again by the first reflecting layer 40, and the light after being reflected again is emitted from the area of the light adjusting film 30 where the reflecting structure 320 is not arranged, and finally is emitted from the light emitting surface of the backlight module. I.e. the third reflective structure 323 in the reflective structure 320 can be used to condition light in areas where the amount of light is high.
The vertical projection of the third reflective structure 323 on the substrate 10 is located between the vertical projections of the adjacent two light emitting units 20 arranged in the first direction X on the substrate 10, i.e., the vertical projection of the third reflective structure 323 on the substrate 10 is located within the vertical projection of the substrate 10 between the adjacent two light emitting units 20 arranged in the first direction X, and/or the vertical projection of the third reflective structure 323 on the substrate 10 is located between the vertical projections of the adjacent two light emitting units 20 arranged in the second direction Y, i.e., the vertical projection of the third reflective structure 323 on the substrate 10 is located within the vertical projection of the substrate 10 between the adjacent two light emitting units 20 arranged in the second direction Y. The light quantity of the area corresponding to the gap q1 between the two adjacent light emitting units 20 arranged along the first direction X and/or the area corresponding to the gap q2 between the two adjacent light emitting units 20 arranged along the second direction Y is more, and correspondingly, the third reflection structure 323 is arranged in the area corresponding to the gap q1 between the two adjacent light emitting units 20 arranged along the first direction X and/or the area corresponding to the gap q2 between the two adjacent light emitting units 20 arranged along the second direction Y, and the area with more light quantity can be adjusted through the third reflection structure 323, 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.
With continued reference to fig. 5, in some alternative embodiments, the vertical projection pattern of the light emitting unit 20 on the substrate 10 is square, and correspondingly, the first reflective structure 321 is square or circular in the vertical projection pattern of the substrate 10, before being adjusted by the light adjusting film 30 and the first reflective layer 40, the light quantity of the backlight module corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 is the greatest, and the first reflective structure 321 adopts a shape corresponding to the shape of the light emitting unit 20, so that the light in the area with the greatest light quantity can be reflected by the first reflective structure 321, and the light emitted by the backlight module is prevented from being concentrated in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10, so that the light distribution of the backlight module is uniform, 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 reflecting structure 321 on the substrate 10 is illustrated as a square or a circle, and in other embodiments of the present invention, the vertical projection pattern of the first reflecting structure 321 on the substrate 10 may also be configured as a star, a polygon, etc. according to actual production requirements, which will not be described herein.
With continued reference to fig. 5, in some alternative embodiments, the distance in the first direction X between two adjacent light emitting units 20 arranged in the first direction X is d1, and the distance in the second direction Y between two adjacent light emitting units 20 arranged in the second direction Y is d2, where d1=d2. Thus, the amount of light within the interval q1 between the adjacent two light emitting units 20 arranged in the first direction X and the interval q2 between the adjacent two light emitting units 20 arranged in the second direction Y is greater than the amount of light within the interval q3 between the adjacent two light emitting units 20 arranged in the third direction Z1 and the interval q4 between the adjacent two light emitting units 20 arranged in the fourth direction Z2, that is, the interval q1 between the adjacent two light emitting units 20 arranged in the first direction X and the amount of light within the interval q2 between the adjacent two light emitting units 20 arranged in the second direction Y are both greater.
The third reflection structure 323 is arranged in the area corresponding to the interval q1 between two adjacent light emitting units 20 arranged along the first direction X between the vertical projections of the substrate 10 and the vertical projections of the substrate 10, wherein the vertical projections of the part of the third reflection structure 323 are positioned along the first direction X, and the light quantity of the area is regulated through the third reflection structure 323, so that the light rays emitted by the backlight module are uniformly distributed, and the problem of uneven brightness of the backlight module in the prior art is solved.
Similarly, the third reflecting structure 323 is disposed in the region corresponding to the interval q2 between two adjacent light emitting units 20 arranged along the second direction Y, where the vertical projection of the substrate 10 is located between the vertical projections of the substrate 10 and 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 reflecting 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 schematic partial view of another backlight module according to the present invention, 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 being adjusted by the light adjusting film 30 and the first reflecting layer 40, the light quantity in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 in the backlight module is the greatest, the first reflecting structure 321 adopts a shape corresponding to the shape of the light emitting unit 20, so that the light in the area with the greatest light quantity can be reflected by the first reflecting structure 321, the light is prevented from being concentrated in the area corresponding to the vertical projection of the light emitting unit 20 on the substrate 10 in the backlight module, 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 reflecting structure 321 on the substrate 10 is illustrated as a rectangle or an ellipse, and in other embodiments of the present invention, the vertical projection pattern of the first reflecting structure 321 on the substrate 10 may also be configured as a star, a polygon, etc. according to actual production requirements, which will not be described herein.
With continued reference to fig. 6, in some alternative embodiments, the length of the vertical projection pattern of the light emitting units 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 units 20 arranged along the first direction X in the first direction X is d3, and the distance between two adjacent light emitting units 20 arranged along the second direction Y in the second direction Y is d4, wherein d3 > d4. Thus, the amount of light in the space q1 between the adjacent two light emitting units 20 arranged in the first direction X is larger than the amount of light in the space q2 between the adjacent two light emitting units 20 arranged in the second direction Y, that is, the amount of light in the space q1 between the adjacent two light emitting units 20 arranged in the first direction X is larger.
The third reflection structure 323 is arranged in the area corresponding to the interval q1 between two adjacent light emitting units 20 arranged along the first direction X between the vertical projections of the substrate 10 and the vertical projections of the substrate 10, wherein the vertical projections of the third reflection structure 323 on the substrate 10 are positioned between the two adjacent light emitting units 20 arranged along the first direction X, and the light quantity of the area is regulated by the third reflection structure 323, so that the light rays emitted by the backlight module are 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 hollowed-out portion 41, and the vertical projection pattern of the light emitting unit 20 on the substrate 10 is located in the vertical projection pattern of the hollowed-out portion 41 on the substrate 10, so as to avoid that the arrangement of the first reflective layer 40 affects 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, the vertical projection pattern of the light emitting unit 20 on the substrate 10 overlaps with the vertical projection pattern of the hollowed-out portion 41 on the substrate 10, so that the area of the hollowed-out 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, which is beneficial to increasing the amount of light emitted from the light emitting surface of the backlight module and improving 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 hollowed-out portion 41 on the substrate 10, the hollowed-out portion 41 is marked at the boundary between the first reflective layer 40 and the light emitting unit 20 in fig. 7. In the related embodiment of the present invention, the labeling manner of the hollowed-out portion 41 is also applicable, and the present invention will not be described in detail.
Fig. 8 is a further cross-sectional view of the backlight module shown in fig. 1 along A-A', referring to fig. 1 and 8, in some alternative embodiments, the backlight module further includes a light collecting sheet 50, where the light collecting sheet 50 is located on a side of the light adjusting film 30 facing away from the substrate 10, and the light collecting sheet 50 may be used to refract the light emitted from the light adjusting film 30, improve the viewing angle distribution of the light, concentrate the light onto the front viewing angle, increase the luminous flux of the front viewing angle, and increase the light utilization rate.
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 shown in fig. 9 along line B-B', and referring to fig. 9 and 10, a display device 1000 is provided according to the present invention, including the backlight module 100 according to the above embodiment of the present invention. The embodiment of fig. 9 is only an example of a mobile phone, and the display device 1000 is described, and it is to be understood that the display device 1000 provided in the embodiment of the present invention may be any other display device 1000 having a display function, such as a computer, a television, a vehicle-mounted display device, etc., which is not particularly limited in this respect. 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 the specific description of the backlight module 100 in the above embodiments may be referred to in detail, which is not repeated herein.
The display device further includes a display panel 200, the display panel 200 is located on the light emitting side of the backlight module 100, and the backlight module 100 is configured to provide a light source for the display panel 200.
According to the embodiment, the backlight module and the display device provided by the invention have the following beneficial effects:
the backlight module provided by the invention comprises a light adjusting film and a first reflecting layer. The light adjusting film is positioned on one side of the light emitting unit far away from the substrate, the first reflecting layer is positioned between the substrate and the light adjusting film, the light 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, the vertical projection of the second reflecting layer on the substrate and the vertical projection of the light emitting unit on the substrate are at least partially overlapped, the reflecting surface of the first reflecting layer faces the light emitting surface of the backlight module, and light emitted by the light emitting unit is at least partially reflected to the reflecting surface of the first reflecting layer through the second reflecting layer, then reflected again through the first reflecting layer and finally 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 uneven brightness of the backlight module in the prior art is solved.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the 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 (16)
1. A backlight module, comprising:
a substrate;
the light-emitting units are positioned on one side of the substrate facing 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 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, wherein the reflecting surface of the second reflecting layer faces to the backlight surface of the backlight module, and the vertical projection of the second reflecting layer on the substrate and the vertical projection of the light emitting unit on the substrate are at least partially overlapped;
the second reflecting layer comprises a plurality of reflecting structures, one reflecting structure comprises a first reflecting structure and a second reflecting structure, and one reflecting structure comprises a plurality of first reflecting sub-parts;
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;
the arrangement density of the first reflecting sub-portions between two adjacent light emitting units arranged in the first direction is d1, the arrangement density of the first reflecting sub-portions between two adjacent light emitting units arranged in the second direction is d2, the arrangement density of the first reflecting sub-portions between two adjacent light emitting units arranged in the third direction is d3, the arrangement density of the first reflecting sub-portions between two adjacent light emitting units arranged in the fourth direction is d4, d1=d2 > d3=d4, wherein any two directions of the first direction, the second direction, the third direction, and the fourth direction intersect.
2. A backlight module according to claim 1, wherein,
one of the reflective structures corresponds to one of the light emitting units;
the vertical projection of the reflecting structure on the substrate and the vertical projection of the corresponding light emitting unit on the substrate are at least partially overlapped.
3. A backlight module according to claim 2, wherein,
the vertical projection of the first reflecting structure on the substrate and the vertical projection of the corresponding light emitting unit on the substrate are at least partially overlapped.
4. A backlight module according to claim 3, wherein,
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 vertical projection of the light emitting unit on the substrate.
5. A backlight module according to claim 3, wherein,
in the same reflecting structure, the second reflecting structure is disposed around the first reflecting structure.
6. A backlight module according to claim 5, wherein,
the plurality of first reflector sub-portions are arranged around the first reflective structure;
the first reflector sub-portion has a size smaller than a size of the first reflective structure.
7. A backlight module according to claim 6, wherein,
one of the second reflective structures further comprises a plurality of second reflective sub-sections arranged around the first reflective structure with the first reflective sub-section between the first reflective structure and the second reflective sub-section;
the second reflector sub-portion has a smaller size than the first reflector sub-portion.
8. A backlight module according to claim 5, wherein,
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 with the second reflective structure between the first and third reflective structures;
the third reflective structure has a size smaller than the size of the first reflective structure;
the vertical projection of the third reflecting structure on the substrate is positioned between the vertical projections of two adjacent light emitting units arranged along the first direction and/or the vertical projection of the third reflecting structure on the substrate is positioned between the vertical projections of two adjacent light emitting units arranged along the second direction.
9. The backlight module according to claim 8, wherein,
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 round.
10. The backlight module according to claim 9, wherein the backlight module comprises,
the interval between two adjacent light emitting units arranged along the first direction is the same as the interval between two adjacent light emitting units arranged along the second direction;
the vertical projection of part of the third reflecting structure on the substrate is positioned between the vertical projections of two adjacent light emitting units arranged along the first direction;
and the vertical projection of part of the third reflecting structure on the substrate is positioned between the vertical projections of two adjacent light emitting units arranged along the second direction.
11. The backlight module according to claim 8, wherein,
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.
12. The backlight module according to claim 11, wherein,
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 on the substrate in the second direction;
the interval between two adjacent light emitting units arranged along the first direction is smaller than the interval 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 two adjacent light emitting units arranged along the first direction.
13. A backlight module according to claim 1, wherein,
the first reflecting layer is provided with a hollowed-out part, and the vertical projection pattern of the light emitting unit on the substrate is positioned in the vertical projection pattern of the hollowed-out part on the substrate.
14. A backlight module according to claim 1, wherein,
the backlight module further comprises a condensing sheet, wherein the condensing sheet is positioned at one side of the light adjusting film, which is away from the substrate.
15. A backlight module according to claim 1, wherein,
the light-emitting unit is Mini-LED or Micro-LED.
16. A display device, characterized in that the display device comprises a backlight module according to any one of claims 1-15.
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| CN114566092B (en) * | 2022-03-10 | 2024-03-08 | 武汉华星光电技术有限公司 | Backlight module and display device |
| CN115047678B (en) * | 2022-06-30 | 2024-01-16 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN115963663A (en) * | 2022-12-29 | 2023-04-14 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110023686A (en) * | 2009-08-28 | 2011-03-08 | 엘지전자 주식회사 | Optical assembly, backlight unit and display apparatus thereof |
| CN106842701A (en) * | 2017-01-11 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of backlight module and liquid crystal display |
| CN107656398A (en) * | 2017-10-13 | 2018-02-02 | 惠州市华星光电技术有限公司 | Liquid crystal display and its backlight module |
| CN109407407A (en) * | 2018-12-21 | 2019-03-01 | 厦门天马微电子有限公司 | Display device |
| KR20200133087A (en) * | 2019-05-16 | 2020-11-26 | 희성전자 주식회사 | Backlight unit having hole pattern reflect sheet |
-
2021
- 2021-10-29 CN CN202111269209.4A patent/CN113885254B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110023686A (en) * | 2009-08-28 | 2011-03-08 | 엘지전자 주식회사 | Optical assembly, backlight unit and display apparatus thereof |
| CN106842701A (en) * | 2017-01-11 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of backlight module and liquid crystal display |
| CN107656398A (en) * | 2017-10-13 | 2018-02-02 | 惠州市华星光电技术有限公司 | Liquid crystal display and its backlight module |
| CN109407407A (en) * | 2018-12-21 | 2019-03-01 | 厦门天马微电子有限公司 | Display device |
| KR20200133087A (en) * | 2019-05-16 | 2020-11-26 | 희성전자 주식회사 | Backlight unit having hole pattern reflect sheet |
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