CN115542608A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN115542608A CN115542608A CN202211236526.0A CN202211236526A CN115542608A CN 115542608 A CN115542608 A CN 115542608A CN 202211236526 A CN202211236526 A CN 202211236526A CN 115542608 A CN115542608 A CN 115542608A
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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
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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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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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)
Abstract
The invention discloses a backlight module and a display device. The backlight module includes: the backlight module comprises a backlight substrate, a plurality of light emitting units and a reflecting sheet which are arranged on the surface of the backlight substrate, and a diffusion plate and a light conversion film which are arranged on one side of the reflecting sheet far away from the backlight substrate; the frame comprises a bottom and a side wall; the backlight substrate comprises a central area and an edge area surrounding the central area, wherein a first compensation structure is arranged between the reflector plate and the light conversion film in the edge area, and/or a second compensation structure is arranged on the surface of the side wall adjacent to the light emitting unit; the first compensation structure comprises a light conversion structure; the second compensation structure comprises a light reflection structure and/or a light conversion structure; the light conversion structure is used for partially converting the first color light emitted by the light emitting unit into the second color light and the third color light. The invention can improve the problems of low edge brightness and blue light emission of the backlight module, thereby improving the problems of low edge brightness and blue light emission of 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
In recent years, a display device having a Liquid Crystal Display (LCD) and a Mini light emitting diode (Mini LED) backlight module has been increasingly applied to high-end displays due to advantages of high contrast, high color gamut and zone dimming.
Fig. 1 is a schematic view of a liquid crystal display device, as shown in fig. 1, the liquid crystal display device includes a backlight module 300 and a liquid crystal display panel 200. The backlight module 300 is a direct type backlight, the Mini LEDs 303 of the central area 301 of the backlight module 300 are provided with more Mini LEDs 303 in the upper, lower, left and right directions, so that the Mini LEDs 303 of the central area 301 are better subjected to the light compensation effect of other Mini LEDs 303, the light emitting brightness of the central area 301 is higher, the light emitting brightness of the central area 301 is close to white light, and the Mini LEDs 303 are not arranged on one side of the edge area 302 away from the central area 301, so that the Mini LEDs 303 of the edge area 302 are poorer subjected to the light compensation effect of other Mini LEDs 303, the light emitting brightness of the edge area 302 is lower, and the light emitting brightness is blue. When the liquid crystal display device adopting the backlight module displays a picture, the edge brightness of the liquid crystal display device is lower, and the color is blue.
Disclosure of Invention
The invention provides a backlight module and a display device, which are used for solving the problems of low edge brightness and blue light emission of the backlight module, and further solving the problems of low edge brightness and blue light emission of the display device.
According to an aspect of the present invention, there is provided a backlight module including:
the backlight module comprises a backlight substrate, a plurality of light emitting units and a reflecting sheet which are arranged on the surface of the backlight substrate, and a diffusion plate and a light conversion film which are arranged on one side of the reflecting sheet far away from the backlight substrate; further comprising a frame comprising a bottom and sidewalls; the backlight substrate comprises a central area and an edge area surrounding the central area, a first compensation structure is arranged between the reflector plate and the light conversion film in the edge area, and/or a second compensation structure is arranged on the surface, adjacent to the light emitting unit, of the side wall;
the vertical projection of the first compensation structure on the backlight substrate is positioned between the light emitting units, and the first compensation structure comprises a light conversion structure;
the second compensation structure comprises a light reflection structure and/or a light conversion structure;
wherein the light conversion structure is used for partially converting the first color light emitted by the light emitting unit into the second color light and the third color light.
Optionally, a plurality of first compensation structures are disposed between the reflective sheet and the light conversion film in the edge region, the plurality of first compensation structures are sequentially arranged along a direction away from the central region, and each first compensation structure surrounds the central region;
the second compensation structure is located in a gap between the reflection sheet and the diffusion plate.
Optionally, in the edge region, one side of each light emitting unit away from the central region and one side of each light emitting unit adjacent to the central region are both provided with one first compensation structure.
Optionally, the widths of the plurality of first compensation structures gradually increase in a direction away from the central region.
Optionally, the minimum width of the first compensation structure is 5% of the width of the reflector plate, and the maximum width of the first compensation structure is 15% of the width of the reflector plate, where the width of the reflector plate is the width of the reflector plate between two adjacent light-emitting units in the row direction or the column direction.
Optionally, the first compensation structure is disposed on a surface of the reflector plate away from the backlight substrate, or the first compensation structure is disposed on a surface of the diffuser plate.
Optionally, the sidewall includes a plurality of sub-sidewalls, and each sub-sidewall is provided with a second compensation structure.
Optionally, a plurality of the first compensation structures are connected into an integral structure through a connecting part.
Optionally, the light conversion structure includes a quantum dot film or a phosphor film.
Optionally, the backlight module further includes a lower brightness enhancement film, an upper brightness enhancement film and a brightness enhancement film, which are sequentially stacked;
the lower brightness enhancement film is arranged on one side, adjacent to the light conversion film, of the upper brightness enhancement film;
the light emitting unit is a mini LED.
According to another aspect of the present invention, a display device is provided, which includes a liquid crystal display panel and the backlight module according to any embodiment of the present invention.
According to the embodiment of the invention, the first compensation structure is arranged at the edge region of the backlight substrate and/or the second compensation structure is arranged on the side wall of the frame, the first light compensation structure can convert the blue light part emitted by the light emitting unit at the edge region into the red light and the green light, and the red light and the green light are reflected by the reflector plate to enter the diffusion plate, so that the light is fully diffused and refracted at different angles, the proportion of the red light and the green light in the edge region is increased, and the problems of light deflection at the edge region and lower brightness are solved. The second light compensation structure comprises a light reflection structure and/or a light conversion structure, the light reflection structure can reflect light irradiated to the frame back to the edge area, the light utilization rate of the edge is effectively improved, the problem of low edge brightness is solved, and the light conversion film can continuously convert the reflected blue light into red light and green light, so that the proportion of red light and green light of the edge area is increased, and the blue bias is improved; the light conversion structure can convert the blue light part irradiated on the frame into red light and green light, thereby increasing the proportion of the red light and the green light at the edge of the backlight module, and improving the problems of light out of the edge region, blue light deflection and lower brightness. Therefore, the embodiment of the invention can improve the problems of light blue-out and low brightness of the edge region of the backlight module by arranging the first compensation structure at the edge region and/or arranging the second compensation structure on the side wall of the frame, thereby improving the problems of light blue-out and low brightness of the edge of the liquid crystal display device.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a liquid crystal display device;
fig. 2 is a schematic top view of a backlight module according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of the backlight module shown in FIG. 2 along a section line AA;
FIG. 4 is a schematic cross-sectional view illustrating a backlight module according to another embodiment of the present invention;
FIG. 5 is a schematic top view illustrating another backlight module according to an embodiment of the present invention;
FIG. 6 is a schematic top view illustrating another backlight module according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view illustrating a backlight module according to another embodiment of the present invention;
FIG. 8 is an enlarged view of an edge region provided by an embodiment of the present invention;
FIG. 9 is a cross-sectional view of another backlight module according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a first compensation configuration provided by an embodiment of the present invention;
fig. 11 is a schematic cross-sectional view of a display device according to an embodiment of the invention;
fig. 12 is a schematic top view of a display device according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An embodiment of the present invention provides a backlight module, fig. 2 is a schematic top view of the backlight module provided in the embodiment of the present invention, fig. 3 is a schematic cross-sectional view of the backlight module in fig. 2 along a sectional line AA, fig. 4 is a schematic cross-sectional view of another backlight module provided in the embodiment of the present invention, and referring to fig. 2 to fig. 4, the backlight module includes:
a backlight substrate 10, a plurality of light emitting units 20 and a reflective sheet 30 disposed on a surface of the backlight substrate 10, and a diffuser plate 50 and a light conversion film 60 disposed on a side of the reflective sheet 30 away from the backlight substrate 10; the reflective sheet 30 is disposed between the light emitting units 20; the diffusion plate 50 is disposed at a side of the light conversion film 60 adjacent to the backlight substrate 10 with a gap between the diffusion plate 50 and the reflection sheet 30 and the light emitting unit 20; the light conversion film 60 serves to partially convert the first color light emitted from the light emitting unit 20 into second and third color lights;
further comprising a frame 100, the frame 100 comprising a bottom 101 and a side wall 102; the bottom 101 is disposed on a side of the backlight substrate 10 away from the light emitting unit 20, and the sidewall 102 partially surrounds the backlight substrate 10;
the backlight substrate 10 comprises a central region 11 and an edge region 12 surrounding the central region 11, a first compensation structure 41 (fig. 2 and 3) is disposed between the reflective sheet 30 and the light conversion film 60 in the edge region 12, and/or a second compensation structure 42 is disposed on a surface of the sidewall 102 adjacent to the light emitting unit 20;
the vertical projection of the first compensation structure 41 on the backlight substrate 10 is located between the light emitting units 20, the first compensation structure 41 includes a light conversion structure;
the second compensation structure 42 comprises a light reflecting structure and/or a light converting structure;
wherein the light conversion structure is used for partially converting the first color light emitted by the light emitting unit 20 into the second color light and the third color light.
Specifically, the backlight substrate 10 is provided with a driving circuit and the like for driving the light emitting unit 20 to emit light. Illustratively, the light emitting unit 20 may be a mini LED, and the backlight substrate 10 is formed with metal traces, where the metal traces include a cathode and an anode of the mini LED, a driving voltage control trace of the anode and the cathode, and the metal traces are used to implement on-off control of the mini LED, implement regional dimming, and the like.
The reflector 30 is used to increase the reflectivity of the optical surface, and reflect the peripheral light that is not scattered, so that the light enters the diffuser 50 again, thereby reducing the light loss. The diffusion plate 50 has a microstructure on the surface thereof, and the principle thereof is to combine a light diffuser and a scientific optical design, so that light rays incident to the diffusion plate 50 are sufficiently and diffusely reflected and refracted at different angles, and the diffusion plate 50 has optical characteristics of high diffusivity, high haze and high transmittance. The diffusion plate 50 and the reflection sheet 30 and the light emitting unit 20 have a gap therebetween, and a support structure (not shown) may be disposed at an edge of the backlight module to support the diffusion plate 50 such that the diffusion plate 50 and the reflection sheet 30 and the light emitting unit 20 have a gap therebetween.
The light conversion film 60 may be a quantum dot material film, or the light conversion film 60 may be a phosphor film. After the first color light emitted from the light emitting unit 20 is irradiated onto the light conversion film 60, a part of the first color light directly transmits through the light conversion film 60, and a part of the first color light is converted into the second color light and the third color light by the light conversion film 60. For example, the first color light may be blue light, the second color light and the third color light may be red light and green light, respectively, the light conversion film 60 converts the high-energy blue light part emitted by the light emitting unit 20 into red light and green light, and the color gamut expression may be greatly improved by finely adjusting the backlight, so that the color is more vivid.
The first compensation structure 41 is disposed between the reflective sheet 30 and the light conversion film 60 in the edge region 12, and/or the second compensation structure 42 is disposed on the surface of the sidewall 102 adjacent to the light emitting unit 20, and the first compensation structure 41 may be disposed only on the edge region 12, the second compensation structure 42 may be disposed only on the sidewall 102, or both the first compensation structure 41 and the second compensation structure 42 may be disposed on the sidewall 102 on the edge region 12.
First light compensation structure 41 can convert the blue light part that the luminescence unit 20 of marginal zone 12 sent into red light and green glow, the reflection that passes through reflector plate 30 again gets into diffuser plate 50, make light obtain the abundant diffuse reflection and the refraction of different angles, thereby increase ruddiness and the green glow's in marginal zone 12 proportion, improve marginal zone 12 and go out light bluish, and because the blue light proportion is higher, the visual effect is darker, increase red light and green glow proportion after, simultaneously can make the visual effect brighten, consequently through setting up first light compensation structure 41, can increase ruddiness and green glow's proportion in marginal zone 12 light-emitting, improve marginal zone 12 and go out light bluish and the lower problem of luminance.
Fig. 5 is a schematic top view of another backlight module according to an embodiment of the present invention, fig. 6 is a schematic top view of another backlight module according to an embodiment of the present invention, fig. 7 is a schematic cross-sectional view of another backlight module according to an embodiment of the present invention, and referring to fig. 4 to fig. 7, the second compensation structure 42 includes a light reflection structure 422 and/or a light conversion structure 421: the second compensation structure 42 may only include the light conversion structure 421 (fig. 4 and 5), the second compensation structure 42 may only include the light reflection structure 422 (fig. 6), or the second compensation structure 42 may include both the light reflection structure 422 and the light conversion structure 421 (fig. 7). Referring to fig. 7, when the second compensation structure 42 includes both the light reflection structure 422 and the light conversion structure 421, the light reflection structure 422 and the light conversion structure 421 may be sequentially arranged along the height direction of the sidewall 102. The second compensation structure 42 may be disposed on the entire sidewall 102 along the direction in which the sidewall 102 surrounds the backlight substrate 10, or may be disposed on a partial region of the sidewall, which is not specifically limited in this embodiment.
Referring to fig. 4 to 7, the light reflection structure 422 may reflect the light irradiated to the frame 100 back to the edge region, so as to improve the light utilization rate of the edge region and improve the problem of low brightness of the edge region, and the reflected light may be reflected by the reflection sheet 30 and enter the diffusion plate 50 and the light conversion film 60, and the light conversion film 60 may continuously convert the reflected blue light into red light and green light, thereby increasing the ratio of the red light to the green light of the edge region 12 and improving the bluish color.
In the embodiment of the present invention, the first compensation structure 41 is disposed on the edge region 12 of the backlight substrate 10 and/or the second compensation structure 42 is disposed on the sidewall of the frame 100, the first compensation structure 41 can convert a blue light portion emitted by the light emitting unit 20 in the edge region into red light and green light, and the red light and the green light are reflected by the reflector sheet 30 and enter the diffuser plate 50, so that the light is fully diffused and refracted at different angles, thereby increasing the ratio of the red light to the green light in the edge region, and improving the problems of light bluish light exiting from the edge region and low luminance. The second light compensation structure 42 includes a light reflection structure 422 and/or a light conversion structure 421, the light reflection structure 422 can reflect the light irradiated to the frame 100 back to the edge region, so as to effectively utilize and improve the light utilization rate of the edge and improve the problem of low edge brightness, and the light conversion film 60 can continuously convert the reflected blue light into red light and green light, thereby increasing the ratio of red light and green light in the edge region and improving the blue bias; the light conversion structure 421 can convert the blue light irradiated onto the frame 100 into red light and green light, thereby increasing the ratio of the red light and the green light at the edge of the backlight module, and improving the problems of light deflection and low brightness at the edge region. Therefore, the embodiment of the invention can improve the problems of light blue-out and low brightness at the edge region of the backlight module by arranging the first compensation structure 41 at the edge region and/or arranging the second compensation structure 42 on the side wall of the frame 100, thereby improving the problems of light blue-out and low brightness at the edge of the liquid crystal display device.
It should be noted that the top view of the backlight module provided in this embodiment only exemplarily shows the light emitting unit and the reflective sheet, and does not limit the present invention.
Alternatively, referring to fig. 2 and 3, a plurality of first compensation structures 41 are disposed between the reflection sheet 30 and the light conversion film 60 in the edge region 12, the plurality of first compensation structures 41 are sequentially arranged in a direction away from the central region 11, and each first compensation structure 41 surrounds the central region 11.
By such arrangement, the blue light emitted by the light emitting unit 20 in the edge region 12 can be converted into red light and green light more, the ratio of the red light to the green light is further increased, and the problems of blue bias and low brightness are solved. And the first compensation structure 41 is arranged to surround the central region 11, so that blue light in each direction of the edge region 12 can be converted into red light and green light more, and each region of the edge region 12 can better improve the problems of blue bias and low brightness.
Alternatively, referring to fig. 7, the second compensation structure 42 is positioned in a gap between the reflective sheet 30 and the diffusion plate 50.
Specifically, since the gap is closer to the light emitting unit 20, more light is irradiated onto the sidewall 102 at the gap, and the second compensation structure 42 is disposed on the sidewall 102 at the gap, so that the light utilization rate can be further improved, the brightness of the edge region can be improved, more red light and green light can be obtained through conversion, and the blue bias can be better improved.
Alternatively, referring to fig. 5 and 6, the sidewall 102 includes a plurality of sub-sidewalls, and each sub-sidewall has the second compensation structure 42 disposed thereon.
Specifically, the sidewall 102 may include three sub-sidewalls, i.e., three sub-sidewalls on the left side, the right side and the upper side, and each sub-sidewall may be provided with the second compensation structure 42. The second compensation structures 42 disposed on the plurality of sub-sidewalls may be connected to each other or independent from each other, and this embodiment is not particularly limited. The second compensation structures 42 are arranged on each sub-side wall, so that light emitted to the frame along each direction can be reflected or converted by the second compensation structures 42, the light utilization rate is further improved, the edge area brightness is improved, and the blue bias is improved.
Optionally, in the edge region, a first compensation structure 41 is disposed on a side of each light emitting unit 20 away from the central region 21 and a side of each light emitting unit adjacent to the central region 21.
By such arrangement, the blue light emitted by each light-emitting unit 20 in the edge region 12 can be converted into red light and green light more, the ratio of the red light to the green light is further increased, and the problems of partial blue and low brightness are solved.
Fig. 8 is an enlarged view of an edge region provided by an embodiment of the present invention, and optionally, referring to fig. 8, the widths D1 of the plurality of first compensation structures 41 gradually increase in a direction away from the central region 11.
Specifically, the closer to the edge of the backlight module, the fewer the light-emitting units 20 in the edge region are located on the side of the light-emitting unit 20 away from the central region 11, the smaller the compensation effect of the other light-emitting units 20 on the light-emitting units 20 in the edge region is, the lower the brightness of the backlight module is, the more blue the backlight module emits light, and by arranging the light-emitting units in the direction away from the central region 21, the width D1 of the plurality of first compensation structures 41 is gradually increased, so that the more blue light is converted by the first compensation structures 41 at the position away from the central region 21, the more red light and green light is converted, and thus the problem of blue bias and low brightness can be better improved in the whole edge region 12.
In addition, the widths D1 of the plurality of first compensation structures 41 may be increased linearly or stepwise (that is, the widths D1 of some adjacent first compensation structures 41 may be equal), and the present embodiment is not limited in particular.
Optionally, the minimum width of the first compensation structure 41 is 5% of the width D2 of the reflective sheet, and the maximum width is 15% of the width D2 of the reflective sheet, where the width D2 of the reflective sheet is the width of the reflective sheet 30 between two adjacent light emitting units 20 along the row direction X or the column direction Y.
Specifically, too large a width of the first compensation structure 41 may cause excessive reduction of blue light, cause red or green bias, cause overcompensation, and the first compensation structure 41 may affect the reflection of light by the reflective sheet 30. Too small a width of the first compensation structure 41 may result in too little red light and green light being converted, resulting in insufficient compensation, and too small a width may result in high difficulty of manufacturing process. Minimum width through setting up first compensation structure 41 is 5% of reflector plate width D2, and maximum width is 15% of reflector plate width D2, can convert right amount of blue light into ruddiness and green glow guaranteeing, and on the better basis of compensating to partly blue and luminance low, can reduce the technology degree of difficulty, avoids first compensation structure 41 to influence the reflex action of reflector plate 30.
Fig. 9 is a cross-sectional view of another backlight module according to an embodiment of the present invention, and optionally, referring to fig. 3 and 9, the first compensation structure 41 is disposed on a surface of the reflective sheet 30 away from the backlight substrate 10 (fig. 3), or the first compensation structure 41 is disposed on a surface of the diffuser plate 50 (fig. 9). The first compensation structure 41 may be disposed on the surface of the reflection sheet 30 or the diffusion plate 50 according to process requirements, and the embodiment is not particularly limited.
Fig. 10 is a schematic diagram of a first compensation structure according to an embodiment of the present invention, and optionally, referring to fig. 10, a plurality of first compensation structures 41 are connected to form an integral structure through a connection portion 43.
Specifically, the first compensation structures 41 are connected to form one film through the connection portion 43, so that after the diffusion plate 50 is formed, the whole film is disposed on the surface of the diffusion plate 50 away from the backlight substrate 10, and the first compensation structures 41 are attached or silk-screened to the surface of the reflection sheet or the diffusion plate one by one without using a silk-screening or attaching procedure.
Optionally, the light conversion structure comprises a quantum dot film or a phosphor film.
Specifically, the light conversion efficiency of the quantum dot material and the fluorescent powder material is high, and the light conversion structure comprising the quantum dot film or the fluorescent powder can improve the conversion efficiency of red light and green light and further improve the problems of partial blue and low brightness.
Optionally, with continuing reference to fig. 9, the backlight module further includes:
a lower brightness enhancement film 70, an upper brightness enhancement film 80, and a brightness enhancement film 90, which are sequentially stacked;
the lower brightness enhancement film 70 is disposed on a side of the upper brightness enhancement film 80 adjacent to the light conversion film 60.
Specifically, lower membrane 70 that adds lustre to, last membrane 80 that adds lustre to and brightness enhancement film 90 are used for concentrating the light of diffuser plate 50 scattering to the backlight module is positive, reaches the purpose that improves front luminance to with the light that is not utilized outside the visual angle, utilize the reflection recycle of light, reduce the loss of light, indirectly reach the effect of energy-conserving low carbon and environmental protection.
Fig. 11 is a schematic cross-sectional view of a display device according to an embodiment of the present invention, and fig. 12 is a schematic top view of the display device according to the embodiment of the present invention, and referring to fig. 11 and 12, the display device includes a liquid crystal display panel 200 and a backlight module 300 according to any embodiment of the present invention.
According to the embodiment of the invention, the problems of light-out bluing and lower brightness of the edge area of the backlight module can be solved by arranging the first compensation structure on the edge area and/or arranging the second compensation structure on the side wall of the frame, so that the problems of light-out bluing and lower brightness of the edge of the display device are solved.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A backlight module, comprising:
the backlight module comprises a backlight substrate, a plurality of light emitting units and a reflecting sheet which are arranged on the surface of the backlight substrate, and a diffusion plate and a light conversion film which are arranged on one side of the reflecting sheet far away from the backlight substrate;
further comprising a frame comprising a bottom and sidewalls;
the backlight substrate comprises a central area and an edge area surrounding the central area, a first compensation structure is arranged between the reflector plate and the light conversion film in the edge area, and/or a second compensation structure is arranged on the surface, adjacent to the light emitting unit, of the side wall;
the vertical projection of the first compensation structure on the backlight substrate is positioned between the light-emitting units, and the first compensation structure comprises a light conversion structure; the second compensation structure comprises a light reflection structure and/or a light conversion structure; wherein the light conversion structure is used for partially converting the first color light emitted by the light emitting unit into the second color light and the third color light.
2. A backlight module according to claim 1, wherein:
a plurality of first compensation structures are arranged between the reflector plate and the light conversion film in the edge region, the first compensation structures are sequentially arranged along the direction far away from the central region, and each first compensation structure surrounds the central region;
the second compensation structure is located in a gap between the reflection sheet and the diffusion plate.
3. A backlight module according to claim 2, wherein:
in the edge region, one side of each light-emitting unit, which is far away from the central region, and one side of each light-emitting unit, which is close to the central region, are both provided with one first compensation structure.
4. A backlight module according to claim 2, wherein:
the width of the first compensation structures is gradually increased along the direction far away from the central area.
5. The backlight module according to claim 4, wherein:
the minimum width of the first compensation structure is 5% of the width of the reflector plate, and the maximum width of the first compensation structure is 15% of the width of the reflector plate, wherein the width of the reflector plate is the width of the reflector plate between two adjacent light-emitting units in the row direction or the column direction.
6. A backlight module according to claim 1, wherein:
the diffusion plate is arranged on one side of the light conversion film adjacent to the backlight substrate;
the first compensation structure is arranged on the surface of the reflector plate far away from the backlight substrate, or the first compensation structure is arranged on the surface of the diffusion plate.
7. A backlight module according to claim 1, wherein:
the side wall comprises a plurality of sub side walls, and each sub side wall is provided with a second compensation structure.
8. A backlight module according to claim 1, wherein:
the first compensation structures are connected into an integral structure through connecting parts; the light conversion structure comprises a quantum dot film or a phosphor film.
9. The backlight module according to claim 1, wherein:
the backlight module also comprises a lower brightness enhancement film, an upper brightness enhancement film and a brightness enhancement film which are sequentially stacked;
the lower brightness enhancement film is arranged on one side, adjacent to the light conversion film, of the upper brightness enhancement film;
the light emitting unit is a mini LED.
10. A display device comprising a liquid crystal display panel and the backlight module of any one of claims 1 to 9.
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| CN202211236526.0A CN115542608A (en) | 2022-10-10 | 2022-10-10 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211236526.0A CN115542608A (en) | 2022-10-10 | 2022-10-10 | Backlight module and display device |
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| CN115542608A true CN115542608A (en) | 2022-12-30 |
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| CN202211236526.0A Pending CN115542608A (en) | 2022-10-10 | 2022-10-10 | Backlight module and display device |
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| CN116540452A (en) * | 2023-05-31 | 2023-08-04 | 惠科股份有限公司 | Backlight module and display device |
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