CN113641035A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113641035A CN113641035A CN202110306196.7A CN202110306196A CN113641035A CN 113641035 A CN113641035 A CN 113641035A CN 202110306196 A CN202110306196 A CN 202110306196A CN 113641035 A CN113641035 A CN 113641035A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 239000003086 colorant Substances 0.000 claims abstract description 7
- 239000002096 quantum dot Substances 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 23
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 15
- 230000005284 excitation Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a backlight module and a display device. The backlight module comprises a back plate and a light source module, wherein the back plate comprises a bottom plate; the light source module is arranged on the bottom plate and comprises a plurality of first light-emitting diodes and a plurality of second light-emitting diodes, each first light-emitting diode is provided with a first light-emitting element and a reflective lens arranged on the first light-emitting element, each second light-emitting diode is provided with a second light-emitting element and a refractive lens arranged on the second light-emitting element, and the plurality of first light-emitting diodes are at least positioned at the corners of the bottom plate; each first light-emitting element emits first light, and each second light-emitting element emits second light; the light source module is provided with a first wavelength conversion layer corresponding to the first light-emitting diodes, at least part of the first light is excited by the first wavelength conversion layer to emit third light, and the colors of the first light and the third light are different. The invention improves the light-emitting uniformity of the backlight module, so that the display device has better display effect.
Description
Technical Field
The present disclosure relates to backlight modules and display devices, and particularly to a backlight module and a display device with improved uniformity of light output.
Background
With the continuous development of liquid crystal display technology, the requirements for the backlight module supplying light sources to the liquid crystal display panel are also higher and higher. In the backlight module, light rays emitted by the light-emitting element are adjusted by the optical film material to form a surface light source, and the surface light source provides a backlight source for the display panel. Corner shadow easily appears in traditional backlight unit, influences backlight unit's light degree of consistency and display module's display effect. The design of HDR dynamic contrast and high color gamut module design and the design of quantum film backlight module derive the problem of dark corners.
Disclosure of Invention
The present invention provides a backlight module and a display device to solve the above problems.
In order to achieve the above object, the present invention provides a backlight module, which includes a back plate and a light source module. The back plate comprises a bottom plate; the light source module is arranged on the bottom plate and comprises a plurality of first light-emitting diodes and a plurality of second light-emitting diodes, each first light-emitting diode is provided with a first light-emitting element and a reflective lens arranged on the first light-emitting element, each second light-emitting diode is provided with a second light-emitting element and a refractive lens arranged on the second light-emitting element, and the plurality of first light-emitting diodes are at least positioned at the corners of the bottom plate; each first light-emitting element emits first light, and each second light-emitting element emits second light; the light source module is provided with a first wavelength conversion layer corresponding to the plurality of second light-emitting diodes, at least part of the first light is excited by the first wavelength conversion layer to emit third light, and the color of the first light is different from that of the third light.
As an optional technical solution, the light source module includes a circuit board, and the plurality of first light emitting diodes and the first wavelength conversion layer are disposed on the circuit board, wherein the first wavelength conversion layer is at least disposed below the reflective lenses of the plurality of first light emitting diodes.
As an optional technical solution, the first light emitting element is a blue LED, and the first wavelength conversion layer is a yellow fluorescent ink layer; or the first wavelength conversion layer is a quantum dot material layer of one of the three primary colors.
As an optional technical solution, the backlight module further includes a quantum dot film, the quantum dot film is located on the light source module, and the quantum dot film includes at least one of a red quantum dot material and a green quantum dot material.
As an optional technical solution, the second light emitting element is a blue LED, the light source module is provided with a second wavelength conversion layer corresponding to the plurality of second light emitting diodes, a part of the second light is emitted to the second wavelength conversion layer to be excited to generate a fourth light, and the color of the second light is different from that of the fourth light.
As an optional technical solution, the backlight module further includes a reflective paper, the reflective paper has an inclined portion, the back plate further has a side plate connected to the bottom plate, the inclined portion is located on the side plate, the inclined portion is provided with a third wavelength conversion layer corresponding to the plurality of first light emitting diodes, and a part of the first light is emitted to the inclined portion through the corresponding reflective lens and emitted from a corresponding corner through a fifth light excited by the third wavelength conversion layer.
As an alternative solution, the third wavelength conversion layer contains a plurality of fluorescent ink dots.
As an optional technical solution, the plurality of fluorescent ink dots are uniformly arranged; or the density of the fluorescent ink dots is gradually increased along with the distance between the fluorescent ink dots and the corresponding corners of the backlight module; or, the size of the fluorescent ink dots gradually increases with the distance from the corresponding corner of the backlight module.
As an optional technical solution, the reflective paper further has a bottom portion, the inclined portion is connected to the bottom portion, the bottom portion is disposed on the bottom plate, the bottom portion has a plurality of first holes, and the plurality of first light emitting diodes and the plurality of second light emitting diodes are exposed from the plurality of first holes.
In addition, the invention also provides a display device which comprises the backlight module.
In the backlight module and the display device, at least the corners of the bottom plate are provided with the light emitting diodes with the light emitting elements and the reflective lenses arranged on the light emitting elements, and part of light rays emitted by the light emitting elements are reflected by the corresponding reflective lenses to be emitted to the corresponding corners of the backlight module so as to increase the light emission of each corner. Furthermore, the fluorescent ink layer is arranged corresponding to the light emitting diode, so that the blue phenomenon possibly occurring in the backlight module is avoided, and the light emitting uniformity of the backlight module is improved. When the backlight module is applied to the display device, the display device has a better display effect.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a cross-sectional view of a display device of the present invention;
FIG. 2 is a cross-sectional view of a backlight module according to the present invention;
FIG. 3 is a partial enlarged cross-sectional view of the backlight module of the present invention;
FIG. 4 is a top view of the backlight module of the present invention;
fig. 5 is a partially enlarged top view of the backlight module of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1 to 5, fig. 1 is a cross-sectional view of a display device according to the present invention; FIG. 2 is a cross-sectional view of a backlight module according to the present invention; FIG. 3 is a partial enlarged cross-sectional view of the backlight module of the present invention; FIG. 4 is a top view of the backlight module of the present invention; fig. 5 is a partially enlarged top view of the backlight module of the present invention. The display device 2000 of the present invention comprises a backlight module 1000 and a display panel 2100, wherein the display panel 2100 is disposed on the backlight module 1000. The backlight module 1000 provides a backlight source to the display panel 2100.
As shown in fig. 2 and 3, the backlight module 1000 includes a light source module 100 and a back plate 200. Backplate 200 includes a base plate 210. The light source module 100 is disposed on the bottom plate 210, and the light source module 100 includes a plurality of first light emitting diodes 110 and a plurality of second light emitting diodes 120, wherein, as shown in fig. 4, the plurality of first light emitting diodes 110 are at least located at corners of the bottom plate 210. Each first led 110 has a first light emitting element 111 and a reflective lens 112 disposed thereon. Each second led 120 has a second light emitting element 121 and a refractive lens 122 disposed thereon. The plurality of first light emitting diodes 110 emit first light, the plurality of second light emitting diodes 120 emit second light, the light source module 100 is provided with a first wavelength conversion layer 130 corresponding to the plurality of first light emitting diodes 110, at least a portion of the first light is emitted by exciting third light through the first wavelength conversion layer 130, and the first light and the third light are different in color.
As shown in fig. 2 and 3, the backlight module 1000 further includes a reflective paper 300, the reflective paper 300 has an inclined portion 310, the back plate 200 has a side plate 220 connected to the bottom plate 210, and the inclined portion 310 is disposed on the side plate 220. In practical operation, a portion of the third light generated by excitation through the first wavelength conversion layer 130 may be emitted from the corresponding first light emitting diode 110 to the adjacent inclined portion 310 of the reflective paper 300, and then emitted from the corresponding corner of the backlight module 1000 through reflection of the inclined portion 310 to the backlight module 1000, for example, to the display panel 2100 above the backlight module 1000.
As shown in fig. 2 and 3, the backlight module 100 may have a circuit board 101, a plurality of first light emitting diodes 110, a plurality of second light emitting diodes 120 and a first wavelength conversion layer 130 may be disposed on the circuit board 101, and the first wavelength conversion layer 130 is at least disposed below the reflective lenses 112 of the plurality of first light emitting diodes 110. In practical applications, the first wavelength conversion layer 130 may be a layer structure corresponding to the shape of the plurality of first light emitting diodes 110, each of the first light emitting elements 111 emits a first light, at least a portion of the first light is emitted onto the corresponding reflective lens 112 and then reflected onto the corresponding first wavelength conversion layer 130, and the portion of the first light is excited by the first wavelength conversion layer 130 to generate a third light. In this embodiment, the first light emitting element 111 is a blue LED, and the first wavelength conversion layer 130 is a yellow fluorescent ink layer, so that the first light is a blue light, and the third light is a white light. In another embodiment, the first wavelength conversion layer 130 is a quantum dot material layer of one of three primary colors. For example, the first wavelength conversion layer 130 is a red quantum dot material layer, the first light emitting element 111 is a blue LED, and thus the first light is a blue light and the third light is a red light; for example, the first wavelength conversion layer 130 is a green quantum dot material layer, and the first light emitting element 111 is a blue LED, so that the first light is a blue light and the third light is a green light.
In practical operation, if the first light emitting diode 110 including the blue LED and the reflective lens 112 is disposed only at the corner of the backlight module 1000, the light emitted from the blue LED is reflected by the corresponding reflective lens and emitted to the corner of the backlight module 1000, and the blue light causes the corner of the backlight module 1000 to turn blue. In the present invention, the first wavelength conversion layer 130 is correspondingly disposed, so that at least a portion of the first light (such as blue light) generated by the first light emitting element 111 is excited by the first wavelength conversion layer 130 to generate white light (or other color light) and then the white light (or other color light) is emitted to the corner of the backlight module 1000, thereby avoiding/reducing the problem of blue-tinged corner of the backlight module 1000.
In the backlight module 1000 of the present invention, at least the first light emitting diode 110 is disposed at the corner of the backlight module 1000, the first light emitting diode 110 has the first light emitting device 111 and the reflective lens 112 disposed thereon, and a part of the first light emitted by the first light emitting device 111 is reflected by the corresponding reflective lens 112 to be emitted to the corresponding corner of the backlight module 1000, so as to increase the light emission at each corner. Further, the first wavelength conversion layer 130 is disposed corresponding to the plurality of first light emitting diodes 110, so as to avoid a blue phenomenon that may occur in the backlight module 1000, and improve the uniformity of the light emitted from the backlight module 1000. When the backlight module 1000 is applied to the display device 2000, the display device 2000 has a better display effect.
In this embodiment, as shown in fig. 2 and 3, the backlight module 1000 further includes a quantum dot film 400, the quantum dot film 400 is located on the light source module 100 and the reflective paper 300, and the quantum dot film 400 includes at least one of a red quantum dot material and a green quantum dot material. The first light emitted from the first light emitting diodes 110 and the second light emitted from the second light emitting diodes 120 are emitted to the quantum dot film 400. In an embodiment, the first light emitting element 111 and the second light emitting element 121 may be blue LEDs, the first wavelength conversion layer 130 is a yellow fluorescent ink layer, and the light emitted to the quantum dot film 400 can excite the red quantum dot material and the green quantum dot material therein to generate pure red light and green light, so that the backlight module 1000 can provide a better backlight source, and the display device 2000 using the backlight module 1000 can have a better color performance.
In this embodiment, the plurality of second light emitting elements 121 are blue LEDs, and the light source module 100 is provided with a second wavelength conversion layer 140 corresponding to the plurality of second light emitting diodes 120. Generally, the second wavelength conversion layer 140 may be disposed on the circuit board 101 and correspondingly below the refractive lens 122 of the second light emitting diode 120. The second wavelength conversion layer 140 is, for example, a yellow fluorescent ink layer. Of the second light emitted by the second light emitting element 121, a part of the light is refracted by the corresponding refractive lens 122 and emitted to the quantum dot film 400, so as to excite and generate pure red light and green light, another part of the light is reflected when emitted to the refractive lens 122 and emitted to the second wavelength conversion layer 140, and the part of the second light is excited by the second wavelength conversion layer 140 to generate a fourth light, which is different from the second light in color, for example, white. The fourth light generated by the excitation can improve the utilization rate of the light generated by the second light emitting element 121. In practice, the first wavelength conversion layer 130 and the second wavelength conversion layer 140 may be formed on the surface of the circuit board 101 by, for example, screen printing, but not limited thereto.
In other embodiments, the second wavelength conversion layer 140 can be a quantum dot material layer with one of three primary colors. For example, the second wavelength conversion layer 140 is a red quantum dot material layer, the second light emitting element 121 is a blue LED, and thus the second light is a blue light, and the fourth light is a red light; because the number of the second light emitting diodes 120 is large, the quantum dot film 400 may only include green quantum dot material, and thus the other portion of the second light (blue light) and the fourth light (red light) may emit the quantum dot film 400 and excite pure green light. For another example, the second wavelength conversion layer 140 is a green quantum dot material layer, and the second light emitting element 121 is a blue LED, so that the second light is a blue light, and the fourth light is a green light; because the number of the second light emitting diodes 120 is large, at this time, the quantum dot film 400 may only include the red quantum dot material, so that the other portion of the second light (blue light) and the fourth light (green light) may emit out of the quantum dot film 400 and excite the pure red light.
In the present invention, the first wavelength conversion layer 130 and the second wavelength conversion layer 140 can be one of the three primary colors, and the fabrication is convenient because only one quantum dot material layer is included. In practice, the first wavelength conversion layer 130 and the second wavelength conversion layer 140 may also be two layers of quantum dot materials with three primary colors, such as red quantum dot material and green quantum dot material, and in this case, the quantum dot film 400 may not be provided.
As shown in fig. 4, the inclined portion 310 of the reflective paper 300 is provided with a third wavelength conversion layer 320 corresponding to the plurality of first light emitting diodes 110. Typically, the first light emitting element 111 is a blue LED, and the third wavelength conversion layer 320 is a yellow fluorescent ink layer. In practical operation, after the first light emitted from the first light emitting element 111 is reflected by the corresponding reflective lens 112, a portion of the first light may be directly emitted from the side edge of the reflective lens 112. When the first light emitting device 111 is a blue LED, the portion of the first light may cause a slight corner bluing phenomenon in the backlight module 1000. In the present invention, the inclined portion 310 of the reflective paper 300 is provided with the third wavelength conversion layer 320 corresponding to the plurality of first light emitting diodes 110, the portion of the first light emitted from the side edge of the reflective lens 112 is emitted onto the inclined portion 310 of the reflective paper 300, and the inclined portion 310 is provided with the third wavelength conversion layer 320 corresponding to the first light emitting diode 110, so that the portion of the first light is excited by the third wavelength conversion layer 320 to generate the fifth light and is emitted from the corresponding corner. The blue first light is excited by the yellow fluorescent ink layer to generate a white fifth light, so that the phenomenon of blue at the corners of the backlight module 1000 can be further avoided, and the light uniformity of the backlight module 1000 is improved.
In practical operation, when the first light generated by the first light emitting element 111 is reflected by the corresponding reflective lens and emitted to the corresponding first wavelength conversion layer 130, and is excited to generate a third light, the third light can be emitted to the inclined portion 310 of the adjacent reflective paper 300. The third wavelength conversion layer 320 is disposed on the inclined portion 310, and the third light can be excited again to ensure that the third light is emitted from the corresponding corner after being excited completely.
As shown in fig. 4, the third wavelength conversion layer 320 includes a plurality of fluorescent ink dots 321. In this embodiment, the plurality of fluorescent ink dots 321 are uniformly arranged. In practical operation, the density of the fluorescent ink dots 321 may gradually increase with the distance from the corresponding corner of the backlight module 1000; alternatively, the size of the fluorescent ink dots 321 gradually increases with the distance from the corresponding corner of the backlight module 1000. Through such an arrangement, the light incident on the third wavelength conversion layer 320 can be completely excited, so that the phenomenon of blue at the corners of the backlight module is avoided while the dark at the corners of the backlight module is avoided, and the uniformity of the light output of the backlight module 1000 is ensured. In addition to increasing the excitation light, a wavelength conversion layer (e.g., fluorescent ink) is added on the circuit board 101 to reflect light from a single lamp under the synchronous consideration without generating dark blue, so as to increase the halo and white emission, balance the uniformity of the backlight module 1000, and locally improve the uniform light emission at four corners of the backlight module 1000.
In practical applications, as shown in fig. 2 and 4, the reflective paper 300 further has a bottom portion 330, the inclined portion 310 is connected to the bottom portion 330, the bottom portion 330 is disposed on the bottom plate 210, the bottom portion 330 has a plurality of first holes 331, and the first light emitting diodes 110 and the second light emitting diodes 120 are exposed from the plurality of first holes 331.
As shown in fig. 4, the first light emitting diodes 110 are disposed at four corners of the backlight module 1000. In practical operation, the leds near the four side edges of the backlight module 1000 may be all leds with reflective lenses; alternatively, the backlight module 1000 is provided with a plurality of light emitting diodes having reflective lenses at four corners, but not limited thereto.
In the backlight module and the display device, at least the corners of the bottom plate are provided with the light emitting diodes with the light emitting elements and the reflective lenses arranged on the light emitting elements, and part of light rays emitted by the light emitting elements are reflected by the corresponding reflective lenses to be emitted to the corresponding corners of the backlight module so as to increase the light emission of each corner. Furthermore, the fluorescent ink layer is arranged corresponding to the light emitting diode, so that the blue phenomenon possibly occurring in the backlight module is avoided, and the light emitting uniformity of the backlight module is improved. When the backlight module is applied to the display device, the display device has a better display effect.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A backlight module is characterized by comprising:
a back plate comprising a bottom plate; and
the light source module is arranged on the bottom plate and comprises a plurality of first light-emitting diodes and a plurality of second light-emitting diodes, each first light-emitting diode is provided with a first light-emitting element and a reflective lens arranged on the first light-emitting element, each second light-emitting diode is provided with a second light-emitting element and a refractive lens arranged on the second light-emitting element, and the plurality of first light-emitting diodes are at least positioned at the corners of the bottom plate;
each first light-emitting element emits first light, and each second light-emitting element emits second light; the light source module group is provided with a first wavelength conversion layer corresponding to the plurality of first light-emitting diodes, at least part of the first light is excited by the first wavelength conversion layer to emit third light, and the color of the first light is different from that of the third light.
2. A backlight module according to claim 1, wherein: the light source module comprises a circuit board, wherein the plurality of first light emitting diodes and the first wavelength conversion layer are arranged on the circuit board, and the first wavelength conversion layer is at least correspondingly arranged below the reflective lenses of the plurality of first light emitting diodes.
3. A backlight module according to claim 1 or 2, characterized in that: the first light-emitting element is a blue light LED, and the first wavelength conversion layer is a yellow fluorescent ink layer; or the first wavelength conversion layer is a quantum dot material layer of one of the three primary colors.
4. A backlight module according to claim 1, wherein: the backlight module also comprises a quantum dot film, the quantum dot film is positioned on the light source module, and the quantum dot film comprises at least one of red quantum dot materials and green quantum dot materials.
5. A backlight module according to claim 1, wherein: the second light emitting element is a blue light LED, the light source module is provided with a second wavelength conversion layer corresponding to the second light emitting diodes, part of the second light rays are emitted to the second wavelength conversion layer to be excited to generate fourth light rays, and the color of the second light rays is different from that of the fourth light rays.
6. A backlight module according to claim 1, wherein: the backlight module also comprises a reflective paper, the reflective paper comprises an inclined part, the back plate also comprises a side plate connected with the bottom plate, the inclined part is positioned on the side plate, the inclined part is provided with a third wavelength conversion layer corresponding to the plurality of first light-emitting diodes, and part of the first light is emitted to the inclined part through the corresponding reflective lens and is emitted from the corresponding corner through exciting a fifth light through the third wavelength conversion layer.
7. A backlight module according to claim 6, wherein: the third wavelength conversion layer contains a plurality of fluorescent ink dots.
8. A backlight module according to claim 7, wherein: the plurality of fluorescent ink dots are uniformly arranged; or the density of the fluorescent ink dots is gradually increased along with the distance between the fluorescent ink dots and the corresponding corners of the backlight module; or, the size of the fluorescent ink dots gradually increases with the distance from the corresponding corner of the backlight module.
9. A backlight module according to claim 6, wherein: the reflective paper further comprises a bottom part, the inclined part is connected with the bottom part, the bottom part is arranged on the bottom plate, the bottom part is provided with a plurality of first holes, and the plurality of first light-emitting diodes and the plurality of second light-emitting diodes are exposed out of the plurality of first holes.
10. A display device comprising the backlight module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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