CN105892146B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN105892146B CN105892146B CN201610344748.2A CN201610344748A CN105892146B CN 105892146 B CN105892146 B CN 105892146B CN 201610344748 A CN201610344748 A CN 201610344748A CN 105892146 B CN105892146 B CN 105892146B
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- 230000005284 excitation Effects 0.000 claims abstract description 57
- 238000006243 chemical reaction Methods 0.000 claims abstract description 56
- 239000002096 quantum dot Substances 0.000 claims description 26
- 230000031700 light absorption Effects 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 10
- 239000010408 film Substances 0.000 claims description 7
- 239000012788 optical film Substances 0.000 claims description 5
- 108010043121 Green Fluorescent Proteins Proteins 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
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- 238000002310 reflectometry Methods 0.000 description 2
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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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
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
-
- 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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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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)
- Liquid Crystal (AREA)
Abstract
The invention relates to a backlight module and a display device, and belongs to the technical field of display. The backlight module includes: the light conversion layer comprises a light conversion body, and the light conversion body is used for emitting excited light under the excitation of the excitation light; the semi-transparent layer is used for allowing one part of light irradiated on the semi-transparent layer to pass through and forbidding the other part of light to pass through. The invention solves the problem of poor display effect of the display device and improves the display effect of the display device. The invention is used for the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of display technology, people have higher and higher requirements on the display quality of display devices. Display devices using quantum dot technology or phosphor technology are increasingly appearing in people's lives because of their high luminous efficiency. The display device (such as a television, a desktop computer display, a tablet computer and the like) comprises a display panel and a backlight module, white light emitted by the backlight module can irradiate the light incident side of the display panel, and the display panel is used for adjusting the transmittance of the white light and filtering the color of the white light, so that the display panel displays images.
In the related art, the backlight module may include: the light conversion layer can be a quantum dot layer including a plurality of red quantum dots and a plurality of green quantum dots. The red quantum dots can emit red light under the excitation of the blue light, and the green quantum dots can emit green light under the excitation of the blue light. When the blue light emitted by the backlight source irradiates the quantum dot layer, one part of the blue light can excite the red quantum dots and the green quantum dots to respectively emit red light and green light to each direction, the other part of the blue light can directly penetrate through the quantum dot layer, and the red light, the green light and the blue light can be superposed to obtain white light, so that the light emitting side of the backlight module emits the white light. It should be noted that the light-emitting side of the backlight module may include a plurality of light-emitting regions, and the white light emitted from the light-emitting region at the center is: the blue light emitted by the light-emitting region, the red light and the green light emitted by the light-emitting region, and the red light and the green light emitted by the light-emitting regions around the light-emitting region are superposed.
In the related art, at the edge of the light-emitting side of the backlight module, the light-emitting areas around a certain light-emitting area emit less red light and green light, so that the light-emitting areas cannot emit white light, and the edge of the display panel cannot normally display, and therefore, the display device has poor display effect.
Disclosure of Invention
The invention provides a backlight module and a display device, aiming at solving the problem that the display effect of the display device is poor. The technical scheme is as follows:
in a first aspect, a backlight module is provided, which includes: a backlight source, a light guide layer, a semi-transparent layer and a light conversion layer,
the semi-transparent layer is positioned on the light emitting side of the light guide layer, the light conversion layer is positioned on the light emitting side of the semi-transparent layer, the light guide layer is used for guiding the excitation light emitted by the backlight source to be emitted from the light emitting side of the light guide layer, the light conversion layer comprises a light conversion body, and the light conversion body is used for emitting excited light under the excitation of the excitation light;
the semi-transparent layer is used for allowing one part of light irradiated on the semi-transparent layer to pass through and forbidding the other part of light to pass through.
Optionally, an orthographic projection of the semi-transparent layer on the light conversion layer is a preset ring shape, and an outer edge of the preset ring shape coincides with an edge of the light conversion layer.
Optionally, the semi-transparent layer is further configured to reflect the other portion of light.
Optionally, the backlight module further includes: a light-absorbing layer which absorbs light,
the light absorption layer is located on the light guiding layer and located on the opposite side of the light emergent side, and the light absorption layer is used for absorbing light.
Optionally, the orthographic projection of the light absorption layer on the light conversion layer is in a target ring shape, and the region where the preset ring shape is located in the region where the target ring shape is located.
Optionally, the light absorption layer is made of black ink.
Optionally, the excitation light includes blue light, and the excited light includes: red and green light.
Optionally, the light conversion body includes: the red quantum dots are used for emitting red light under the excitation of the blue light, and the green quantum dots are used for emitting green light under the excitation of the blue light;
alternatively, the light conversion body includes: the fluorescent powder comprises red fluorescent powder particles and green fluorescent powder particles, wherein the red fluorescent powder particles are used for emitting red light under the excitation of the blue light, and the green fluorescent powder particles are used for emitting green light under the excitation of the blue light.
Optionally, the light guide layer is a lateral light guide plate.
Optionally, the backlight module further includes: an optical film layer and a reflecting film layer,
the optical film layer is positioned on the light emitting side of the light conversion layer, and the reflection film layer is positioned on one side, far away from the light guide layer, of the light absorption layer.
In a second aspect, there is provided a display device including: the backlight module of the first aspect.
In summary, the present invention provides a backlight module and a display device, in which a semi-transparent layer in the backlight module is located on a light-emitting side of a light-guiding layer, and a light-converting layer is located on the light-emitting side of the semi-transparent layer, when excitation light emitted from a backlight source is emitted from the light-emitting side of the light-guiding layer, light that does not pass through the semi-transparent layer can be directly emitted from the light-emitting side of the light-guiding layer to the light-converting layer, but only a part of the excitation light that passes through the semi-transparent layer can pass through the semi-transparent layer, so that less excitation light is irradiated on an edge of the light-converting layer, and more excitation light is irradiated on a center of the light-converting layer, thereby reducing the excitation light emitted from the edge of the light-converting layer, and making light emitted from a light-emitting area on the light-emitting side edge of the.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a backlight module provided in the related art;
fig. 2-1 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
fig. 2-2 is a schematic view of a partial structure of a backlight module according to an embodiment of the invention;
fig. 3-1 is a schematic structural diagram of another backlight module according to an embodiment of the invention;
fig. 3-2 is a schematic partial structure diagram of another backlight module according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a backlight module 1 provided in the related art, and for example, the backlight module 1 may include a backlight source (not shown in fig. 1), a light guide plate 11 and a light conversion layer 12.
For example, the backlight can emit blue light, the light guide plate 11 can be a side-in light guide plate, and the light conversion layer 12 can be a quantum dot layer including red quantum dots and green quantum dots, that is, the red quantum dots in the light conversion layer 12 can be excited by the blue light emitted from the backlight to emit red light in all directions (only one direction of red light is shown in the figure), and the green quantum dots in the light conversion layer 12 can be excited by the blue light emitted from the backlight to emit green light in all directions (only one direction of green light is shown in fig. 1). A portion of the blue light emitted by the backlight can pass directly through the light conversion layer 12 where the quantum dots are located. So that the light-emitting side of the light-converting layer 12 can emit white light in which red light, green light, and blue light are superimposed.
For example, the light-emitting side of the light-converting layer 12 may include a plurality of light-emitting regions, and the white light emitted from the light-emitting region P1 located at the center is: blue light (composed of blue light emitted from the light-emitting region P1) emitted from the top-view region L1 of the light-converting layer 12 in fig. 1, and yellow light (composed of red and green light emitted from the light-emitting region P1, and red and green light emitted from the light-emitting regions around the light-emitting region P1) emitted from the top-view region H1 of the light-converting layer 12 in fig. 1. At the edge of the light-emitting side of the light-converting layer 12, since the light-emitting regions around a certain light-emitting region P2 emit less red light and less green light, the light-emitting region P2 at the edge emits blue light and cannot emit white light. The blue light emitted from the light-emitting region P2 is composed of: blue light (composed of blue light emitted from the light-emitting region P2) emitted from the top-view region L2 of the light-converting layer 12 in fig. 1, and yellow light (composed of red and green light emitted from the light-emitting region P2, and red and green light emitted from the light-emitting regions around the light-emitting region P2) emitted from the top-view region H2 of the light-converting layer 12 in fig. 1.
As shown in fig. 2-1, an embodiment of the present invention provides a backlight module 0, where the backlight module 0 may include: a backlight (not shown in fig. 2-1), a light guiding layer 02, a semi-transmissive layer 03, and a light converting layer 04.
Illustratively, the semi-transmissive layer 03 may be located on the light-emitting side of the light-guiding layer 02, the light-converting layer 04 is located on the light-emitting side of the semi-transmissive layer 03, the light-guiding layer 02 may be configured to guide the excitation light emitted from the backlight source to uniformly emit the excitation light from the light-emitting side of the light-guiding layer 02, and the light-converting layer 04 includes a light converter (not shown in fig. 2-1) configured to emit excited light in all directions under excitation of the excitation light emitted from the backlight source, and the excitation light and the excited light can be superimposed to form white light. The semi-transmissive layer 03 serves to allow a portion of light irradiated on the semi-transmissive layer 03 to pass therethrough and to inhibit another portion of light irradiated on the semi-transmissive layer 03 from passing therethrough.
In summary, in the backlight module provided in the embodiments of the present invention, the semi-transmissive layer is located on the light-emitting side of the light-guiding layer, and the light-converting layer is located on the light-emitting side of the semi-transmissive layer, when the excitation light emitted from the backlight source is emitted from the light-emitting side of the light-guiding layer, the light that does not pass through the semi-transmissive layer can be directly emitted from the light-emitting side of the light-guiding layer to the light-converting layer, but only a part of the excitation light that passes through the semi-transmissive layer can pass through the semi-transmissive layer, so that the excitation light that irradiates on the edge of the light-converting layer is less, and the excitation light that irradiates on the center of the light-converting layer is more, thereby reducing the excitation light that irradiates on the edge of the light-converting layer, and making the light emitted from the light-emitting region on.
Further, as shown in fig. 2-2, the semi-transmissive layer 03 may be annular, an orthographic projection of the semi-transmissive layer 03 on the light conversion layer 04 is a predetermined annular shape, and an outer edge of the predetermined annular shape coincides with an edge of the light conversion layer. For example, when the semi-transmissive layer 03 is formed, an annular semi-transmissive layer may be directly coated on the light exit side of the light guide layer 02. Or, a film layer made of the same material as the semi-transparent layer is coated on the light emergent side of the light guiding layer 02, and the film layer is processed by adopting a one-step composition process to obtain the annular semi-transparent layer 03.
Optionally, fig. 3-1 is a schematic structural diagram of another backlight module 0 according to an embodiment of the present invention, as shown in fig. 3-1, based on fig. 2-1, the backlight module 0 may further include a light absorbing layer 05, the light absorbing layer 04 is located on the light guiding layer 02 and located on the opposite side of the light exit side of the light guiding layer 02, and the light absorbing layer 05 is used for absorbing light irradiated on the light absorbing layer 05. Optionally, the material of the light absorbing layer 05 may be black ink, and in practical applications, the material of the light absorbing layer 05 may also be other materials having a light absorbing function, which is not limited in the embodiment of the present invention. The semi-transmissive layer 03 may reflect another part of light irradiated on the semi-transmissive layer 03 when the other part of light is prohibited from passing through the semi-transmissive layer 03.
For example, referring to fig. 3-2, the light absorbing layer 05 may also be in a ring shape, and referring to fig. 3-1, the orthographic projection of the light absorbing layer 05 on the light conversion layer 04 is in a target ring shape, and the area where the projection (preset ring shape) of the semi-transmissive layer 03 on the light conversion layer 04 is located in the area where the orthographic projection (target ring shape) of the light absorbing layer 05 on the light conversion layer 04 is located. Preferably, the preset ring shape may coincide with a center of the target ring shape, and a width of the preset ring shape may be smaller than a width of the target ring shape. When the semi-transmissive layer 03 reflects the excitation light that is not allowed to pass through, the light-absorbing layer 05 can be irradiated with the reflected light, and the light-absorbing layer 05 can absorb the reflected light. It should be noted that, when the light absorbing layer 05 is formed on the opposite side of the light emergent side of the light guiding layer 02, reference may be made to the specific step of forming the semi-transmissive layer 03 on the light emergent side of the light guiding layer 02, and details of the embodiment of the present invention are not described herein.
Further, when light is irradiated on the semi-transmissive layer 03, the semi-transmissive layer 03 can allow m% (m%) of light to pass therethrough and prohibit n% (n%) of light to pass therethrough, and the sum of m and n may be 100. In practical applications, the sum of m and n may not be 100, which is not limited in the embodiment of the present invention. Optionally, the ratio of the transmittance to the reflectance of the semi-permeable membrane may be adjusted according to the amount of blue light emitted from the edge of the light conversion layer, so as to solve the problem that the blue light is emitted from the edge of the light conversion layer. If more blue light is emitted from the edge of the light conversion layer, the reflectivity of the semi-permeable membrane to the blue light can be increased, and the transmissivity of the semi-permeable membrane to the blue light is reduced; if the blue light emitted from the edge of the light conversion layer is less, the reflectivity of the semi-permeable membrane to the blue light can be reduced, and the transmissivity of the semi-permeable membrane to the blue light can be increased.
For example, the excitation light emitted by the backlight source may be blue light, and the excited light converted by the light converter from the excitation light may include: red and green light. That is, the light emitted from the light-emitting side of the light conversion layer may include red light, green light, and blue light, and the red light, the green light, and the blue light can be superimposed to obtain white light.
In one aspect, the light converter in the light conversion layer 04 may include: red quantum dots (not shown in fig. 3-1) and green quantum dots (not shown in fig. 3-1), wherein the red quantum dots can be used for emitting red light to all directions under the excitation of blue light emitted by the backlight source; the green quantum dots can be used for emitting green light to all directions under the excitation of blue light emitted by the backlight source. On the other hand, the light converter in the light conversion layer 04 may include: red phosphor particles (not shown in fig. 3-1) and green phosphor particles (not shown in fig. 3-1), wherein the red phosphor particles can be used to emit red light in all directions under the excitation of blue light emitted by the backlight; the green phosphor particles can be used to emit green light in all directions under the excitation of blue light emitted by the backlight.
It should be noted that the light guiding layer 02 in the backlight module 0 provided in the embodiment of the present invention may be a side-in light guide plate, and since the light incident side of the side-in light guide plate is the left side or the right side of the side-in light guide plate, the backlight source may be disposed on the left side or the right side of the side-in light guide plate, so as to effectively reduce the thickness of the backlight module; in practical applications, the light guiding layer 02 may also be a diffuser, which is not limited in the embodiments of the present invention, and the light incident side of the diffuser is the front side or the back side of the diffuser, in which case, the backlight source may be disposed on the front side or the back side of the diffuser.
Further, the backlight module 0 may further include: the optical film layer 06 can be located on the light emitting side of the light conversion layer 04, and the reflection film layer 07 can be located on the side of the light absorption layer 05 away from the light guide layer 02.
In the backlight module provided by the embodiment of the invention, the semi-transparent layer allows one part of the blue light emitted from the edge of the light guide layer to pass through the semi-transparent layer, prohibits the other part of the light from passing through the semi-transparent layer, and reflects the other part of the light to the light absorption layer for absorption, so that the blue light emitted from the edge of the light guide layer is effectively reduced, and the blue light emitted from the center of the light guide layer is not reduced. When blue light is emitted into the light guide layer from the light incident side of the light guide layer and is emitted out of the light guide layer from the light emergent side of the light guide layer, because the semi-transparent layer is arranged at the light emergent side edge of the light guide layer, the semi-transparent layer can allow a part of the blue light in the light emitted out from the light emergent side edge of the light guide layer to pass through, reflect the other part of the blue light which is forbidden to pass through to the light absorption layer, and the light is absorbed by the light absorption layer. Therefore, more blue light enters the center of the light conversion layer and less blue light enters the edge.
The red quantum dots in the light conversion layer emit red light under the excitation of blue light, the green quantum dots in the light conversion layer emit green light under the excitation of the blue light, some blue light directly penetrates through the light conversion layer, and the red light, the green light and the blue light are superposed to form white light, so that the white light is emitted from the light emitting side of the light conversion layer. In particular, since more blue light enters the center of the light conversion layer and more red light and green light are excited in the center of the light conversion layer, more blue light, more red light and more green light can be superimposed into white light and emitted from the light emitting side of the light conversion layer; because less blue light enters the edge of the light conversion layer and less red and green light is excited out of the edge of the light conversion layer, less blue light, less red light, and less green light can still be superimposed into white light and emitted from the light emitting side of the light conversion layer. Therefore, the light emitted from the edge and the center of the light-emitting side of the light conversion layer is white light.
In summary, in the backlight module provided in the embodiments of the present invention, the semi-transmissive layer is located on the light-emitting side of the light-guiding layer, and the light-converting layer is located on the light-emitting side of the semi-transmissive layer, when the excitation light emitted from the backlight source is emitted from the light-emitting side of the light-guiding layer, the light that does not pass through the semi-transmissive layer can be directly emitted from the light-emitting side of the light-guiding layer to the light-converting layer, but only a part of the excitation light that passes through the semi-transmissive layer can pass through the semi-transmissive layer, so that the excitation light that irradiates on the edge of the light-converting layer is less, and the excitation light that irradiates on the center of the light-converting layer is more, thereby reducing the excitation light that irradiates on the edge of the light-converting layer, and making the light emitted from the light-emitting region on.
As shown in fig. 4, an embodiment of the present invention provides a display device 10, and the display device 10 may include: the backlight module 0 shown in fig. 2-1 or fig. 3-1. Further, the display device may further include a display panel 11, and the backlight module 0 may be disposed on the light incident side of the display panel 11.
In summary, in the backlight module in the display device according to the embodiment of the invention, the semi-transmissive layer is located on the light-emitting side of the light-guiding layer, and the light-converting layer is located on the light-emitting side of the semi-transmissive layer, when the excitation light emitted from the backlight source is emitted from the light-emitting side of the light-guiding layer, the light that does not pass through the semi-transmissive layer can be directly emitted from the light-emitting side of the light-guiding layer to the light-converting layer, but only a part of the excitation light that passes through the semi-transmissive layer can pass through the semi-transmissive layer, so that the excitation light that irradiates on the edge of the light-converting layer is less, and the excitation light that irradiates on the center of the light-converting layer is more, thereby reducing the excitation light that irradiates from the edge of the light-converting layer, and making the light emitted from the light-emitting area on the.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (6)
1. A backlight module is characterized in that the backlight module comprises: a backlight source, a light guide layer, a semi-transparent layer, a light absorbing layer and a light conversion layer,
the semi-transparent layer is positioned on the light emitting side of the light guide layer, the light conversion layer is positioned on the light emitting side of the semi-transparent layer, the light guide layer is used for guiding the excitation light emitted by the backlight source to be emitted from the light emitting side of the light guide layer, the light conversion layer comprises a light conversion body, and the light conversion body is used for emitting excited light under the excitation of the excitation light;
the semi-transparent layer is used for allowing one part of the excitation light irradiated on the semi-transparent layer to pass through and reflecting the other part of the excitation light;
the light absorption layer is positioned on the light guide layer and is positioned on the opposite side of the light emergent side, and the light absorption layer is used for absorbing the other part of the excitation light;
the orthographic projection of the semi-transparent layer on the light conversion layer is in a preset ring shape, and the outer edge of the preset ring shape is superposed with the edge of the light conversion layer;
the orthographic projection of the light absorption layer on the light conversion layer is in a target ring shape, and the area where the preset ring is located in the area where the target ring is located.
2. The backlight module according to claim 1,
the light absorption layer is made of black ink.
3. The backlight module according to claim 1,
the excitation light comprises blue light, and the excited light comprises: red and green light.
4. The backlight module according to claim 3,
the light conversion body includes: the red quantum dots are used for emitting red light under the excitation of the blue light, and the green quantum dots are used for emitting green light under the excitation of the blue light;
alternatively, the light conversion body includes: the fluorescent powder comprises red fluorescent powder particles and green fluorescent powder particles, wherein the red fluorescent powder particles are used for emitting red light under the excitation of the blue light, and the green fluorescent powder particles are used for emitting green light under the excitation of the blue light.
5. A backlight module according to claim 1, further comprising: an optical film layer and a reflecting film layer,
the optical film layer is positioned on the light emitting side of the light conversion layer, and the reflection film layer is positioned on one side, far away from the light guide layer, of the light absorption layer.
6. A display device, characterized in that the display device comprises: a backlight module according to any of claims 1 to 5.
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| CN107065305A (en) * | 2017-05-23 | 2017-08-18 | 上海中航光电子有限公司 | Backlight module, display module and display device |
| CN107203064A (en) * | 2017-07-03 | 2017-09-26 | 厦门天马微电子有限公司 | A kind of display device |
| CN107340638A (en) * | 2017-08-09 | 2017-11-10 | 厦门天马微电子有限公司 | Backlight module, display module and display device |
| CN110556054A (en) * | 2018-05-31 | 2019-12-10 | 青岛海信电器股份有限公司 | flexible Micro LED display device |
| KR102562566B1 (en) * | 2018-08-08 | 2023-08-02 | 삼성전자주식회사 | Display apparatus |
| CN109521604A (en) * | 2018-12-21 | 2019-03-26 | 厦门天马微电子有限公司 | A kind of backlight module and display device |
| US11762235B2 (en) | 2020-03-30 | 2023-09-19 | Beijing Boe Optoelectronics Technology Co., Ltd. | Backlight module and display device |
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Address after: 266555, No. 218, Bay Road, Qingdao economic and Technological Development Zone, Shandong Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555, No. 218, Bay Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |