CN109407405B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN109407405B CN109407405B CN201811571717.6A CN201811571717A CN109407405B CN 109407405 B CN109407405 B CN 109407405B CN 201811571717 A CN201811571717 A CN 201811571717A CN 109407405 B CN109407405 B CN 109407405B
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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
- G02F1/133606—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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- 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)
- Optical Elements Other Than Lenses (AREA)
Abstract
The embodiment of the invention discloses a backlight module, which comprises: a backlight source for generating an outgoing light; the first area of the first brightness enhancement film is provided with a plurality of first light-gathering elements extending along a first direction, the second area of the first brightness enhancement film is provided with at least one second light-gathering element extending along the first direction, the refractive index of the second light-gathering element is larger than that of air, and under the same condition and under the irradiation of the same light beam, a light spot formed by the emergent light of the second light-gathering element on a preset plane is smaller than that formed by the emergent light of the first light-gathering element on the preset plane, so that the brightness difference between the edge area and the central area of a display picture is relieved, and the quality of the display picture is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device comprising the backlight module.
Background
High-Dynamic Range (HDR) images can provide more Dynamic ranges and image details than ordinary images, can better reflect visual effects in real environments, and gradually become an important research direction in the display field. However, in the display screen of the conventional display device adopting the HDR display mode, the peripheral region of the display screen is darker than the central region of the display screen, which affects the display screen quality of the display device.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a backlight module and a display device to improve the quality of a display image.
In order to solve the above problems, the embodiments of the present invention provide the following technical solutions:
a backlight module includes:
a backlight source for generating an outgoing light;
the first area of the first brightness enhancement film is provided with a plurality of first light-gathering elements extending along a first direction, the second area of the first brightness enhancement film is provided with at least one second light-gathering element extending along the first direction, the refractive index of the second light-gathering element is larger than that of air, and under the same condition and under the irradiation of the same light beam, the light spot formed by the emergent light of the second light-gathering element on a preset plane is smaller than that formed by the emergent light of the first light-gathering element on the preset plane.
Optionally, the first light-gathering element is a triangular prism, and the second light-gathering element is a convex lens.
Optionally, the second region includes a plurality of component regions, the component regions include a first component region and a second component region that are disposed opposite to each other, the first component region and the second component region are located on different sides of the first region, and a value range of a width of the component region along a second direction is 0mm to 3mm, including a right end point value, where the second direction is perpendicular to the first direction.
Optionally, a width of the second light condensing element along the second direction is the same as a width of the first light condensing element along the second direction.
Optionally, a width of the second condensing element along the second direction ranges from 24 μm to 40 μm, inclusive;
the number N of the second light condensing elements is equal to S/W, wherein S represents the width of the composition region along the second direction, and W represents the width of the second light condensing elements along the second direction.
Optionally, the brightness enhancement film further comprises:
a second brightness enhancement film on a side of the first brightness enhancement film toward the backlight, the second brightness enhancement film comprising a third region and a fourth region surrounding the third region, the third region of the second brightness enhancement film having a plurality of third light focusing elements extending in a second direction; wherein the second direction is perpendicular to the first direction.
Optionally, the fourth region of the second brightness enhancement film has a plurality of third light concentrating elements extending in a second direction.
Optionally, the third light condensing element is a triangular prism.
Optionally, a fourth region of the second brightness enhancement film has at least one fourth light-concentrating element extending along the second direction, a refractive index of the fourth light-concentrating element is greater than a refractive index of air, and under the same condition and under irradiation of the same light beam, a light spot formed by an emergent light ray of the fourth light-concentrating element on a preset plane is smaller than a light spot formed by an emergent light ray of the third light-concentrating element on the preset plane.
Optionally, the fourth light-condensing element is a convex lens.
Optionally, an orthographic projection of the first region on the second brightness enhancement film coincides with the third region, and an orthographic projection of the second region on the second brightness enhancement film coincides with the fourth region.
Optionally, the method further includes:
a color conversion layer between the brightness enhancement film and the backlight;
a diffuser film positioned between the color conversion layer and the brightness enhancement film.
A display device, comprising:
the backlight module provided by any one of the above items, and a display panel located at the light-emitting side of the backlight module.
Compared with the prior art, the technical scheme has the following advantages:
in the technical solution provided by the embodiment of the present invention, the brightness enhancement film includes a first brightness enhancement film, the first brightness enhancement film includes a first region and a second region surrounding the first region, the first region of the first brightness enhancement film has a plurality of first light collecting elements extending along a first direction, the second region of the first brightness enhancement film has at least one second light collecting element extending along the first direction, and a refractive index of the second light collecting element is greater than a refractive index of air, so that the second light collecting element can have a light collecting effect on light rays incident on the second light collecting element, the light intensity of the second region is increased, and under the same condition and irradiation of the same light beam, light rays emitted from the second light collecting element form a light spot on a predetermined plane smaller than a light spot formed on the predetermined plane by light rays emitted from the first light collecting element, the light condensing effect of the second light condensing element is larger than that of the first light condensing element, so that the difference between the light intensity of the emergent light of the second area and the light intensity of the emergent light of the first area is reduced, the phenomenon that the edge area of a display picture of a display device comprising the backlight module is darker than the central area of the display picture is relieved, and the display quality of the display picture is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 2 is a top view of a first brightness enhancement film in a backlight module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a backlight module according to another embodiment of the invention;
fig. 4 is a schematic structural diagram of a backlight module according to another embodiment of the invention;
FIG. 5 is a schematic structural diagram of a backlight module according to still another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a backlight module according to another embodiment of the invention;
FIG. 7 is a schematic structural diagram of a backlight module according to still another embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a backlight module according to still another embodiment of the invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The existing display device generally comprises a display panel and a backlight module, wherein the backlight module is a direct type backlight module, comprises an LED array consisting of a plurality of LED light sources and a fluorescent film positioned on the light outlet side of the LED array, the LED light sources are blue LEDs and emit blue light, the fluorescent film is excited by the blue light emitted by the LED light sources and converts the blue light emitted by the LED light sources into light with a plurality of colors to be emitted, and the light with the plurality of colors is mixed to form white light so that the display panel can utilize the white light emitted by the backlight module to display a picture.
Specifically, in the backlight module, a plurality of LED light sources are arranged in an array, and light emitted from each LED light source is radial, so that the light intensity of the central area of the LED array is greater than the light intensity of the edge area of the LED array, and further the light energy of the central area of the LED array is greater than the light energy of the edge area of the LED array, which makes the edge area of a display picture of a display device including the backlight module darker than the central area of the display picture, thereby affecting the quality of the display picture.
It should be noted that, although the LED light source in the backlight module is usually a blue LED, the present invention is not limited thereto, and in other embodiments of the present invention, the LED light source in the backlight module may also be an LED emitting light of other colors, such as a red LED, a green LED, or a violet LED, as the case may be.
In view of the above, an embodiment of the present invention provides a backlight module, as shown in fig. 1, the backlight module includes:
a backlight 10, the backlight 10 being configured to generate outgoing light;
the brightness enhancement film is positioned on the light emitting side of the backlight 10 and comprises a first brightness enhancement film 20, and the first brightness enhancement film 20 is used for increasing the transmission amount of the light emitted by the backlight 10. Optionally, the first brightness enhancement film 20 includes a first region and a second region surrounding the first region, the first region of the first brightness enhancement film 20 has a plurality of first light-gathering elements 21 extending along the first direction X, the second region of the first brightness enhancement film 20 has at least one second light-gathering element 22 extending along the first direction X, the refractive index of the second light-gathering element 22 is greater than that of air, so that the second light-gathering element 22 can have a light-gathering effect on light rays impinging on the second light-gathering element 22, the light intensity of the second region is increased, and under the same condition and irradiation of the same light beam, emergent light rays of the second light-gathering element 22 form a light spot in a predetermined plane smaller than that of emergent light rays of the first light-gathering element 21, so that the light-gathering effect of the second light-gathering element 22 is greater than that of the first light-gathering element 21, therefore, the difference between the light intensity of the emergent light of the second area and the light intensity of the emergent light of the first area is reduced, the phenomenon that the edge area of a display picture of the display device comprising the backlight module is darker than the central area of the display picture is relieved, and the display quality of the display picture is improved.
On the basis of the above embodiments, in an embodiment of the present invention, the refractive index of the first light condensing element 21 is greater than that of air, so that the first light condensing element 21 can have a light condensing effect on light emitted thereto, the light intensity of the first area is increased, and the power consumption of the backlight 10 is reduced under the same display screen brightness.
On the basis of any of the above embodiments, in an embodiment of the present invention, the refractive index of the second light-concentrating element 22 is greater than the refractive index of the first light-concentrating element 21, so that the light-concentrating effect of the second light-concentrating element 22 is greater than the light-concentrating effect of the first light-concentrating element 21; in this embodiment, the shapes of the second light concentrating element 22 and the first light concentrating element 21 may be the same or different, and the invention is not limited thereto as long as the light concentrating effect of the second light concentrating element 22 is ensured to be greater than that of the first light concentrating element 21.
In another embodiment of the present invention, the refractive index of the second light-concentrating element 22 is the same as that of the first light-concentrating element 21, and the shape of the second light-concentrating element 22 is different from that of the first light-concentrating element 21, so that the light-concentrating effect of the second light-concentrating element 22 is greater than that of the first light-concentrating element 21.
On the basis of the above embodiments, in an embodiment of the present invention, the material of the second light-condensing element 22 is the same as the material of the first light-condensing element 21, so that the second light-condensing element 22 and the first light-condensing element 21 can be manufactured in the same step, the process flow of the backlight module is simplified, and the cost of the backlight module is reduced.
In addition to any of the above embodiments, in one embodiment of the present invention, the first light collecting element 21 is a triangular prism, and the second light collecting element 22 is a convex lens, but the present invention is not limited to this, and in other embodiments of the present invention, the first light collecting element 21 and the second light collecting element 22 may have other shapes as long as the light collecting effect of the second light collecting element 22 is ensured to be greater than the light collecting effect of the first light collecting element 21.
On the basis of any of the above embodiments, in an embodiment of the present invention, as shown in fig. 2, the second region B includes a plurality of component regions, the plurality of component regions includes a first component region B1 and a second component region B2 which are oppositely disposed, the first component region B1 and the second component region B2 are located on different sides of the first region a, and a width of the component regions along a second direction Y is in a range of 0mm to 5mm, including a right end value, wherein the second direction Y is perpendicular to the first direction X. However, the present invention is not limited to this, and in other embodiments of the present invention, the width of the composition area along the second direction Y may also be in other ranges, specifically depending on a luminance-darker area in a display screen of a display device including the backlight module.
Optionally, in an embodiment of the invention, a width of the composition region along the second direction Y ranges from 0mm to 3mm, including a right end value, so as to reduce an area of the second region and increase an area of the first region on the basis of alleviating a luminance difference between the second region and the first region, thereby increasing uniformity of a light intensity subsection of light emitted from the backlight module.
On the basis of any of the above embodiments, in an embodiment of the invention, as shown in fig. 1, only one second light focusing element 22 may be disposed in the second region of the first brightness enhancement film 20 to simplify the process difficulty of the first brightness enhancement film 20, and in another embodiment of the invention, as shown in fig. 3, a plurality of second light focusing elements 22 may also be disposed in the second region of the first brightness enhancement film 20 to improve the light focusing effect of the second region, so as to improve the light intensity of the second region, which is not limited in this disclosure. In the embodiment of the present invention, the larger the number of the second condensing elements 22 disposed in the second region of the first brightness enhancement film 20 is, the better the condensing effect of the second region is, the stronger the intensity of the light emitted from the second region is, the more uniform the light intensity distribution is, and the better the quality of the display screen formed by the light emitted from the backlight module is.
On the basis of any of the above embodiments, in an embodiment of the present invention, the display device applied to the backlight module is a middle-small sized display device with a size not greater than 14 inches, in an embodiment of the present invention, the size of the LED light source ranges from 0.1mm to 0.5mm (that is, the width of the LED light source along the second direction Y ranges from 0.1mm to 0.5mm), and the distance between adjacent LED light sources ranges from 1mm to 1.5mm, so that under the existing process capability condition, the width of the composition region along the second direction Y ranges from 0mm to 3mm, including a right endpoint value, but the present invention is not limited thereto The distance between adjacent LED light sources and the size of the display device.
On the basis of the above embodiments, in an embodiment of the present invention, the width of the first light-gathering element 21 along the second direction Y ranges from 24 μm to 40 μm, inclusive, and the number of the first light-gathering elements in the first area ranges from 75 to 125, inclusive, so as to reduce the process difficulty of the first light-gathering element 21 on the basis of increasing the light intensity of the first area as much as possible.
On the basis of the above embodiments, in an embodiment of the present invention, the number of the second condensing elements 22 in the second region ranges from 1 to 125 inclusive, which is not limited in the present invention, as the case may be.
Continuing with FIG. 3, assuming that the width of the edge darkened area of the display device along the second direction Y is S, i.e., S represents the width of the component area along the second direction Y, then: the number N of the second condensing elements 22 is equal to S/W, where W represents the width of the second condensing elements 22 along the second direction Y.
Optionally, on the basis of the above embodiment, in an embodiment of the present invention, a width of the second light condensing element 22 along the second direction Y is the same as a width of the first light condensing element 21 along the second direction Y, so as to improve uniformity of luminance distribution of a display screen formed by using the emergent light of the backlight module, and improve display quality of the display screen.
Continuing with the example of the middle-small-sized display device applied to the backlight module as no greater than 14 inches, when the width of the second light-condensing element 22 along the second direction Y is the same as the width of the first light-condensing element 21 along the second direction Y, the width of the second light-condensing element 22 along the second direction Y ranges from 24 μm to 40 μm, inclusive, and the number of the second light-condensing elements 22 in the second region ranges from 75 to 125, inclusive, so as to not increase the process difficulty of the second light-condensing element 22 too much on the basis of increasing the light intensity of the second region as much as possible and reducing the light intensity difference between the second region and the first region, but the present invention is not limited thereto, depending on the situation.
In addition to any of the above embodiments, in an embodiment of the present invention, as shown in fig. 4, the brightness enhancement film further includes: and a second brightness enhancement film 30 positioned on a side of the first brightness enhancement film 20 facing the backlight 10 to further increase the transmission amount of light emitted from the backlight 10.
Optionally, in the embodiment of the present invention, the second brightness enhancement film 30 includes a third area and a fourth area surrounding the third area, as shown in fig. 5, the third area of the second brightness enhancement film 30 has a plurality of third light focusing elements 31 extending along a second direction Y, wherein the second direction Y is perpendicular to the first direction X.
In the embodiment of the present invention, the third area of the second brightness enhancement film 30 has a plurality of third light condensing elements 31 extending along the second direction Y, so as to further increase the intensity of the light emitted from the first area, and reduce the power consumption of the backlight 10 when displaying a display image with the same brightness.
In addition to the above embodiments, in an embodiment of the present invention, as shown in fig. 5, the fourth area of the second brightness enhancement film 30 also has a plurality of third light focusing elements 31 extending along the second direction Y, so as to increase the intensity of the light emitted from the second area and reduce the power consumption of the backlight 10 when displaying a display image with the same brightness.
Optionally, on the basis of any of the above embodiments, in an embodiment of the present invention, the refractive index of the third light condensing element 31 is greater than the refractive index of air, specifically, the third light condensing element 31 may be a triangular prism, but the present invention is not limited to this, and in another embodiment of the present invention, the third light condensing element 31 may also be a light condensing structure with another shape, as the case may be.
In another embodiment of the present invention, as shown in fig. 6, a fourth region of the second brightness enhancement film 30 has at least one fourth light-gathering element 32 extending along the second direction, the refractive index of the fourth light-gathering element 32 is greater than that of air, so that the fourth light-gathering element 32 can have a light-gathering effect on light rays emitted to an incident surface thereof, the light intensity of the second region is increased, and under the same condition, under the same light beam irradiation, a light spot formed by emergent light rays of the fourth light-gathering element 32 on a predetermined plane is smaller than a light spot formed by emergent light rays of the third light-gathering element 31 on the predetermined plane, so that the light-gathering effect of the fourth light-gathering element 32 is greater than that of the third light-gathering element 31, thereby reducing a difference between the light intensity of emergent light rays of the second region and the light intensity of emergent light rays of the first region, the phenomenon that the edge area of the display picture of the display device comprising the backlight module is darker than the central area of the display picture is relieved, and the display quality of the display picture is improved.
On the basis of the above embodiments, in an embodiment of the invention, only one fourth light-gathering element may be disposed in the fourth region of the second brightness enhancement film 30, as shown in fig. 6, so as to simplify the process difficulty of the second brightness enhancement film 30; in another embodiment of the present invention, a plurality of fourth light-gathering elements may be disposed in a fourth area of the second brightness enhancement film 30, as shown in fig. 7, to improve the light-gathering effect of the fourth area, but the present invention is not limited thereto, as the case may be.
On the basis of any of the above embodiments, in an embodiment of the present invention, the refractive index of the fourth light condensing element 32 is greater than the refractive index of the third light condensing element 31, so that the light condensing effect of the fourth light condensing element 32 is greater than the light condensing effect of the third light condensing element 31; in this embodiment, the shapes of the fourth light condensing element 32 and the third light condensing element 31 may be the same or different, and the present invention is not limited thereto as long as the light condensing effect of the fourth light condensing element 32 is ensured to be larger than that of the third light condensing element 31.
In another embodiment of the present invention, the refractive indexes of the fourth light concentrating element 32 and the third light concentrating element 31 are the same, and the shape of the fourth light concentrating element 32 is different from that of the third light concentrating element 31, so that the light concentrating effect of the fourth light concentrating element 32 is greater than that of the third light concentrating element 31.
On the basis of the above embodiments, in an embodiment of the present invention, the material of the fourth light condensing element 32 is the same as the material of the third light condensing element 31, so that the fourth light condensing element 32 and the third light condensing element 31 can be manufactured in the same step, the process flow of the backlight module is simplified, and the cost of the backlight module is reduced.
In addition to any of the above embodiments, in one embodiment of the present invention, the third light condensing element 31 is a triangular prism, and the fourth light condensing element 32 is a convex lens, but the present invention is not limited to this, and in other embodiments of the present invention, the third light condensing element 31 and the fourth light condensing element 32 may have other shapes as long as the light condensing effect of the fourth light condensing element 32 is ensured to be greater than the light condensing effect of the third light condensing element 31.
In addition to any of the above embodiments, in one embodiment of the present invention, the orthographic projection of the first region on the second brightness enhancement film 30 coincides with the third region, so that the first region and the third region strictly correspond, and the orthographic projection of the second region on the second brightness enhancement film 30 coincides with the fourth region, so that the second region and the fourth region strictly correspond, but the present invention is not limited thereto, and in other embodiments of the present invention, the orthographic projection of the first region on the second brightness enhancement film 30 may not coincide with the third region, for example, the orthographic projection of the first region on the second brightness enhancement film 30 is slightly larger than or slightly smaller than the third region, as the case may be.
It should be noted that, in an alternative embodiment of the present invention, the second area of the first brightness enhancement film 20 has at least one second light focusing element 22, and the fourth area of the second brightness enhancement film 30 has a plurality of third light focusing elements 31, so as to improve the uniformity of the light intensity distribution of the second area, avoid the light emitted from the second area from being too concentrated, and reduce the uniformity of the brightness distribution of the edge area of the display screen of the display device that uses the light emitted from the backlight module to perform the screen display, on the basis of improving the light intensity of the edge area and reducing the difference of the light intensity of the light emitted from the second area and the first area.
It should be further noted that, although the above embodiments describe the backlight module by taking the case where the brightness enhancement film includes the first brightness enhancement film 20 or includes both the first brightness enhancement film 20 and the second brightness enhancement film 30, the present invention is not limited thereto, and in other embodiments of the present invention, the brightness enhancement film may further include more brightness enhancement films, as the case may be.
On the basis of any of the above embodiments, in an embodiment of the present invention, as shown in fig. 1, the backlight 10 includes: the LED illumination device includes a substrate 11 and a plurality of LED light sources 12 fixed on one side of the substrate 11 facing the brightness enhancement film, where the plurality of LED light sources 12 are arranged in an array, and optionally, the LED light sources 12 are blue LEDs, but the present invention is not limited thereto, and in other embodiments of the present invention, the LED light sources 12 may also be LEDs emitting light of other colors, such as red LEDs, green LEDs, or violet LEDs, as the case may be. The backlight module is described below by taking the LED light source as a blue LED as an example.
On the basis of any of the above embodiments, in an embodiment of the present invention, as shown in fig. 8, the backlight module further includes:
the color conversion layer 40 is located between the brightness enhancement film and the backlight source 10, and the color conversion layer 40 is used for converting light emitted from the backlight source 10 into light of multiple colors and emitting the light, and the light of the multiple colors is mixed to form white light, so that the display device can display a picture by using the white light emitted from the backlight module. Optionally, the color conversion layer is a fluorescent film.
Specifically, when the backlight source 10 includes a plurality of blue LEDs, the color conversion layer includes red phosphor and green phosphor to partially convert the blue light emitted from the LED light source into red light and green light, and further mix the red light and the green light to form white light. It should be noted that, when the backlight 10 includes a plurality of red LEDs or violet LEDs, the types of the phosphors included in the color conversion layer 40 may also vary accordingly, as the case may be.
On the basis of any of the above embodiments, in an embodiment of the present invention, as shown in fig. 9, the backlight module further includes: and the diffusion film 50 is positioned between the color conversion layer 40 and the brightness enhancement film, so that the emergent light of the color conversion layer 40 is diffused by the diffusion film 50, and the uniformity of the emergent light of the backlight module is improved.
Accordingly, an embodiment of the present invention further provides a display device, as shown in fig. 10, where the display device includes: the backlight module 100 and the display panel 200 located at the light-emitting side of the backlight module 100 are provided in any of the embodiments.
Optionally, in an embodiment of the present invention, the display panel 200 is a liquid crystal display panel, but the present invention is not limited thereto, as long as the display panel 200 is a passive display panel.
On the basis of the foregoing embodiments, in one embodiment of the present invention, the display panel 200 only has a display function, and in another embodiment of the present invention, the display panel 200 not only has a display function, but also has a touch function.
In summary, in the backlight module and the display device provided in the embodiments of the present invention, the brightness enhancement film includes a first brightness enhancement film, the first brightness enhancement film includes a first region and a second region surrounding the first region, the first region of the first brightness enhancement film has a plurality of first light collecting elements extending along a first direction, the second region of the first brightness enhancement film has at least one second light collecting element extending along the first direction, and a refractive index of the second light collecting element is greater than a refractive index of air, so that the second light collecting element can have a light collecting effect on light rays incident to the second light collecting element, the light intensity of the second region is increased, and under the same condition and irradiation of the same light beam, emergent light rays of the second light collecting element form a light spot on a predetermined plane smaller than that of emergent light rays of the first light collecting element, the light condensing effect of the second light condensing element is larger than that of the first light condensing element, so that the difference between the light intensity of the emergent light of the second area and the light intensity of the emergent light of the first area is reduced, the phenomenon that the edge area of a display picture of a display device comprising the backlight module is darker than the central area of the display picture is relieved, and the display quality of the display picture is improved.
In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A backlight module, comprising:
a backlight source for generating an outgoing light;
the first area of the first brightness enhancement film is provided with a plurality of first light-gathering elements extending along a first direction, the second area of the first brightness enhancement film is provided with at least one second light-gathering element extending along the first direction, the refractive index of the second light-gathering element is greater than that of air, and under the same condition, under the irradiation of the same light beam, the light spot formed by the emergent light of the second light-gathering element on a preset plane is smaller than that formed by the emergent light of the first light-gathering element on the preset plane;
wherein the backlight comprises: the LED light source comprises a substrate and a plurality of LED light sources fixed on one side of the substrate, which faces a brightness enhancement film, wherein the LED light sources are arranged in an array manner, and light rays emitted by the LED light sources are in a radial shape; the first light-gathering element is a triangular prism, and the second light-gathering element is a convex lens.
2. The backlight module according to claim 1, wherein the second region comprises a plurality of component regions, the plurality of component regions comprises a first component region and a second component region which are oppositely arranged, the first component region and the second component region are located on different sides of the first region, and a width of the component regions along a second direction has a value ranging from 0mm to 3mm, including a right end value, wherein the second direction is perpendicular to the first direction.
3. A backlight module according to claim 2, wherein the width of the second condensing element along the second direction is the same as the width of the first condensing element along the second direction.
4. The backlight module according to claim 2, wherein the width of the second condensing element along the second direction ranges from 24 μm to 40 μm inclusive;
the number N of the second light condensing elements is equal to S/W, wherein S represents the width of the composition region along the second direction, and W represents the width of the second light condensing elements along the second direction.
5. The backlight module according to any of claims 1-4, wherein the brightness enhancement film further comprises:
a second brightness enhancement film on a side of the first brightness enhancement film toward the backlight, the second brightness enhancement film comprising a third region and a fourth region surrounding the third region, the third region of the second brightness enhancement film having a plurality of third light focusing elements extending in a second direction; wherein the second direction is perpendicular to the first direction.
6. A backlight module as recited in claim 5, wherein the fourth region of the second brightness enhancement film comprises a third plurality of light concentrating elements extending in a second direction.
7. A backlight module according to claim 5, wherein the third light focusing element is a triangular prism.
8. The backlight module as claimed in claim 5, wherein the fourth region of the second brightness enhancement film has at least one fourth light-collecting element extending along the second direction, the refractive index of the fourth light-collecting element is greater than that of air, and under the same condition, the spot formed by the emergent ray of the fourth light-collecting element on the predetermined plane is smaller than the spot formed by the emergent ray of the third light-collecting element on the predetermined plane under the irradiation of the same light beam.
9. The backlight module as claimed in claim 8, wherein the fourth light condensing element is a convex lens.
10. The backlight module as recited in claim 5 wherein an orthographic projection of the first region on the second brightness enhancement film coincides with the third region and an orthographic projection of the second region on the second brightness enhancement film coincides with the fourth region.
11. The backlight module of claim 1, further comprising:
a color conversion layer between the brightness enhancement film and the backlight;
a diffuser film positioned between the color conversion layer and the brightness enhancement film.
12. A display device, comprising:
a backlight module as claimed in any one of claims 1 to 11, and a display panel located at the light exit side of the backlight module.
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| CN201811571717.6A CN109407405B (en) | 2018-12-21 | 2018-12-21 | Backlight module and display device |
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| CN201811571717.6A CN109407405B (en) | 2018-12-21 | 2018-12-21 | Backlight module and display device |
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| CN109407405B true CN109407405B (en) | 2021-11-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114019720B (en) * | 2021-11-03 | 2024-01-19 | 惠州视维新技术有限公司 | Backlight module and display device |
| CN114236905A (en) | 2021-12-14 | 2022-03-25 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN114823807B (en) * | 2022-02-07 | 2024-12-03 | 武汉华星光电半导体显示技术有限公司 | Display Panel |
| CN114879408B (en) * | 2022-05-25 | 2023-05-02 | 厦门天马微电子有限公司 | Backlight module and display module |
| CN115343790A (en) * | 2022-08-04 | 2022-11-15 | 武汉华星光电技术有限公司 | Optical film and display device |
| CN119148283B (en) * | 2024-11-12 | 2025-03-11 | 苏州理湃科技有限公司 | Backlight module and AR equipment |
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| CN109407405A (en) | 2019-03-01 |
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