CN112987408A - Backlight module and display panel - Google Patents
Backlight module and display panel Download PDFInfo
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- CN112987408A CN112987408A CN202110358157.1A CN202110358157A CN112987408A CN 112987408 A CN112987408 A CN 112987408A CN 202110358157 A CN202110358157 A CN 202110358157A CN 112987408 A CN112987408 A CN 112987408A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- 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
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Abstract
The invention discloses a backlight module and a display panel, wherein the backlight module comprises a reflector plate, a diffusion plate and a plurality of light-emitting units, each light-emitting unit is arranged between the reflector plate and the diffusion plate, each light-emitting unit comprises a top light-emitting surface, a bottom surface and a plurality of side light-emitting surfaces, the top light-emitting surfaces are generally parallel to the diffusion plate, the vertical projection of the top light-emitting surfaces on the diffusion plate is smaller than the vertical projection of the bottom surfaces on the diffusion plate, gaps or contact exist between the top light-emitting surfaces and the diffusion plate, and the included angle between at least one side light-emitting surface and the bottom surface is an acute angle, so that the aims of good brightness uniformity, better image quality effect and thinner liquid crystal display product thickness can be.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a backlight module and a display panel.
Background
With the increasing demands of consumers on the image quality and product form of liquid crystal display products, the effects of ultra-thin and high image quality are gradually becoming the standard for high-end liquid crystal display products. The method comprises the following steps that at present, the number of partitions is increased through a direct type scheme to achieve a high image quality effect, and further in order to enable the display effect to be better, a quantum dot membrane is used, but the thickness of the quantum dot membrane is increased due to the fact that the quantum dot membrane has a certain thickness; in addition, in order to achieve a better image quality, the backlight is changed from the original white LED to a red LED, a green LED, and a blue LED, but the color uniformity is poor due to the LED characteristics.
Moreover, the liquid crystal display product is thinner by reducing the light mixing distance, but for the product with the light mixing distance of zero, the distance between the backlight source and the screen is short, the single-point energy is high, and the brightness uniformity of the whole display picture is poor.
Disclosure of Invention
The invention provides a backlight module and a display panel, which aim to achieve the aims of good color uniformity, good brightness uniformity, better image quality effect and thinner liquid crystal display product thickness.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a backlight module, including a reflective sheet, a diffuser plate, and a plurality of light emitting units, where each of the light emitting units is disposed between the reflective sheet and the diffuser plate, each of the light emitting units includes a top light emitting surface, a bottom surface, and a plurality of side light emitting surfaces, which are substantially parallel to the diffuser plate, a vertical projection of the top light emitting surface on the diffuser plate is smaller than a vertical projection of the bottom surface on the diffuser plate, a gap or a contact exists between the top light emitting surface and the diffuser plate, and an included angle between at least one of the side light emitting surfaces and the bottom surface is an acute angle.
According to one embodiment of the invention, each of the light emitting units comprises at least two different light emission colors; and the mixed light of each light-emitting unit or the mixed light of two adjacent light-emitting units is white.
According to one embodiment of the present invention, the light emitting unit includes four side light emitting faces; the light-emitting unit is in a quadrangular frustum pyramid structure.
According to one embodiment of the present invention, the light emitting unit includes a blue light source; the light emitting color of the top light emitting surface of each light emitting unit is blue; the plurality of light emitting units comprise a first light emitting unit and a second light emitting unit; the first light-emitting units and the second light-emitting units are arranged at intervals along the row direction and/or the column direction of the array;
the light emitting colors of adjacent side light emitting faces of the adjacent first light emitting unit and the adjacent second light emitting unit are different.
According to one embodiment of the invention, the light color of the side light emitting surface in the first light emitting unit is green; and the light emitting color of the side light emitting surface of the second light emitting unit is red.
According to one embodiment of the present invention, a side light emitting face of the first light emitting unit is provided with green phosphor; and a red fluorescent powder or new red fluorescent powder is arranged on the side light-emitting surface of the second light-emitting unit.
According to one embodiment of the present invention, the side light emitting surface of the light emitting unit is provided with a green quantum dot layer, and the side light emitting surface of the second light emitting unit is provided with a red quantum dot layer.
According to one embodiment of the invention, the luminous intensity of the top luminous surface of the luminous unit accounts for 7% -13% of the total luminous intensity, and the luminous intensity of the side luminous surface accounts for 19.5% -25.5% of the total luminous intensity; the first light emitting unit has a light emission intensity twice as high as that of the second light emitting unit.
According to one embodiment of the present invention, the green quantum dot layer and the red quantum dot layer each include at least one of a perovskite material, an inorganic perovskite material, and an inorganic-organic hybrid perovskite material.
According to one embodiment of the invention, the first light emitting unit comprises a first side light emitting face, a second side light emitting face, a third side light emitting face and a fourth side light emitting face; the first side light emitting surface and the second side light emitting surface are oppositely arranged; the third side luminous surface and the fourth side luminous surface are oppositely arranged; the second light emitting unit comprises a fifth side light emitting surface, a sixth side light emitting surface, a seventh side light emitting surface and an eighth side light emitting surface; the fifth side luminous surface and the sixth side luminous surface are oppositely arranged; the seventh side luminous surface and the eighth side luminous surface are oppositely arranged; the light emitting colors of the first side light emitting surface and the second side light emitting surface are red; the light emitting colors of the third side light emitting surface and the fourth side light emitting surface are green; the light emitting colors of the fifth side light emitting surface and the sixth side light emitting surface are green; the light emitting colors of the seventh side light emitting surface and the eighth side light emitting surface are red.
According to one embodiment of the invention, the device further comprises a plurality of white light auxiliary light sources; the first light emitting unit, the second light emitting unit and the white light auxiliary light source are sequentially and periodically arranged along the array row direction and/or the array column direction.
According to one embodiment of the invention, the included angle between the side light emitting surface and the bottom surface ranges from 35 degrees to 75 degrees.
According to one embodiment of the present invention, the light emitting unit includes three side light emitting faces; the light-emitting unit is of a triangular frustum structure.
According to one embodiment of the present invention, the light emitting unit includes a blue light source; the light emitting color of the top light emitting surface is white, the light emitting colors of the three side light emitting surfaces are red, green and blue respectively, and the light emitting units are arranged in an array.
According to one embodiment of the invention, the three side light emitting faces are a red side light emitting face, a green side light emitting face and a blue side light emitting face, respectively; the top light-emitting surface is provided with YAG fluorescent powder; the red side light-emitting surface is provided with red fluorescent powder or new red fluorescent powder, and the green side light-emitting surface is provided with green fluorescent powder.
According to one embodiment of the invention, the three side light emitting faces are a red side light emitting face, a green side light emitting face and a blue side light emitting face, respectively; the LED module comprises a top light-emitting surface, a red side light-emitting surface and a green side light-emitting surface, wherein the top light-emitting surface is provided with a red green blue quantum dot layer, the red side light-emitting surface is provided with a red quantum dot layer, and the green side light-emitting surface is provided with a green quantum dot layer.
According to one embodiment of the present invention, the light emission intensity of the top emission surface accounts for 22% to 28% of the total light emission intensity of the light emission unit, the light emission intensity of the red side emission surface accounts for 19.5% to 25.5% of the total light emission intensity of the light emission unit, the light emission intensity of the green side emission surface accounts for 42% to 48% of the total light emission intensity of the light emission unit, and the light emission intensity of the blue side emission surface accounts for 4.5% to 10.5% of the total light emission intensity of the light emission unit.
According to one embodiment of the invention, the included angle between the side light emitting surface and the bottom surface is in a range of 35-90 degrees.
According to one embodiment of the invention, the device further comprises a plurality of white light auxiliary light sources; the plurality of white light auxiliary light sources are positioned between two adjacent rows and/or two adjacent columns of the light emitting units.
According to one embodiment of the present invention, a plurality of the white auxiliary light sources are located at midpoints of diagonal lines of adjacent four of the light emitting units.
According to one embodiment of the invention, a diffusing particle layer is disposed on the top light emitting face.
In order to achieve the above object, another embodiment of the present invention provides a display panel, which includes the backlight module as described above.
According to the backlight module and the display panel provided by the embodiment of the invention, the backlight module comprises a reflector plate, a diffusion plate and a plurality of light-emitting units, each light-emitting unit is arranged between the reflector plate and the diffusion plate, each light-emitting unit comprises a top light-emitting surface, a bottom surface and a plurality of side light-emitting surfaces which are generally parallel to the diffusion plate, the vertical projection of the top light-emitting surfaces on the diffusion plate is smaller than the vertical projection of the bottom surface on the diffusion plate, a gap or contact exists between the top light-emitting surfaces and the diffusion plate, and the included angle between at least one side light-emitting surface and the bottom surface is an acute angle, so that the aims of good brightness uniformity, better image quality effect and thinner liquid crystal display product thickness can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module proposed in the prior art;
FIG. 2 is a diagram illustrating the distribution of light intensity of LEDs in a backlight module according to the prior art;
fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
fig. 4 (a) is a schematic structural diagram of a light-emitting unit in a backlight module according to an embodiment of the invention; FIG. 4 (b) is a plan view of (a);
FIG. 5 is a schematic diagram of an arrangement of light-emitting units in a backlight module according to an embodiment of the invention;
FIG. 6 is a cross-sectional view illustrating an arrangement of light emitting units in a backlight module according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an arrangement of light-emitting units in a backlight module according to another embodiment of the invention;
FIG. 8 is a schematic diagram illustrating an arrangement of light-emitting units in a backlight module according to another embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating an arrangement of light-emitting units in a backlight module according to still another embodiment of the present invention;
FIG. 10 is a schematic diagram of an arrangement of light-emitting units in a backlight module according to another embodiment of the invention;
FIG. 11 is a schematic structural diagram of a light-emitting unit in a backlight module according to another embodiment of the present invention;
FIG. 12 is a schematic diagram illustrating an arrangement of light-emitting units in a backlight module according to another embodiment of the present invention;
FIG. 13 is a schematic diagram illustrating an arrangement of light-emitting units in a backlight module according to still another embodiment of the present invention;
fig. 14 is a schematic structural diagram of a display panel according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a backlight module proposed in the prior art. FIG. 2 is a diagram illustrating the distribution of light intensity of LEDs in a backlight module of the prior art. As shown in fig. 1 and 2, the backlight module in fig. 1 includes a diffusion plate 1, light emitting diodes 2 of different colors, and a reflection sheet 3, wherein the light emitting diodes 2 of different colors are disposed on the reflection sheet 3. Since the conventional led 2 has the strongest light intensity in the direction perpendicular to the diffuser plate 1 (as shown in fig. 2), the light intensity in the direction diverging outward becomes lower except in the direction perpendicular to the diffuser plate, and the light intensity distribution of the entire led 2 on the diffuser plate 1 is high in the middle and low on both sides. In order to make the brightness on the display screen uniform, the light emitting diodes 2 are arranged at a distance from the diffusion plate 1, so that the light emitted by each light emitting diode of the whole backlight module is uniformly mixed together, and the thickness of the whole backlight module is thicker. If the backlight module is desired to be thinned, as shown in fig. 1, the diffusion plate 1 is moved downward to reduce the distance between the light emitting diode 2 and the diffusion plate 1, and there is a problem that a single bright point and a single dark point appear on the display screen.
In view of the above problems, the embodiment of the invention provides a backlight module 100. Fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the invention. As shown in fig. 3, the backlight module 100 includes a reflective sheet 101, a diffuser plate 103, and a plurality of light emitting units 102, each light emitting unit 102 is disposed between the reflective sheet 101 and the diffuser plate 103, each light emitting unit 102 includes a top light emitting surface 1021, a bottom surface 1022, and a plurality of side light emitting surfaces 1023 substantially parallel to the diffuser plate 103, a vertical projection of the top light emitting surface 1021 on the diffuser plate 103 is smaller than a vertical projection of the bottom surface 1022 on the diffuser plate 103, a gap or contact exists between the top light emitting surface 1021 and the diffuser plate 103, and an included angle α between at least one side light emitting surface 1023 and the bottom surface 1022 is an acute angle.
The area of the top light emitting surface 1021 of the light emitting unit 102 is set smaller than the area of the bottom surface 1022, and the top light emitting area of the light emitting unit 102 in the present application is reduced in the direction perpendicular to the light emitting direction of the diffusion plate 103 compared to the area of the light emitting diode in the related art, so that the amount of light emitted from the top light emitting surface of the light emitting diode 2 in the related art is reduced. And the included angle α between at least one side light emitting surface 1023 of the light emitting unit 102 and the bottom surface 1022 is an acute angle, so that the light emitted from the side light emitting surface 1023 of the light emitting unit 102 can be irradiated onto the diffusion plate 103 to compensate the light emitting amount of the top light emitting surface. Thus, the light intensity distribution of the whole light emitting unit 102 on the diffusion plate 103 is more uniform, the phenomenon that the light intensity distribution of the light emitting unit in the prior art is high in the middle and low on two sides is avoided, and the problem of single-point bright spots is solved. Therefore, the vertical distance between the light emitting unit 102 and the diffusion plate 103 can be made zero, which effectively reduces the thickness of the backlight module and makes the backlight module thinner.
It should be noted that the substantially parallel means that, in an ideal state, the top light emitting surface 1021 and the bottom surface 1022 of each light emitting unit 102 are parallel to the diffusion plate 103. While in other states, the top light emitting surface 1021 and the bottom surface 1022 of each light emitting unit 102 are both substantially parallel to the diffuser plate 103, errors may exist.
In addition, there is a gap or contact between the top light emitting surface 102 and the diffusion plate 103, and the gap may be close to zero, that is, the vertical distance between the top light emitting surface 102 and the diffusion plate 103 may be zero. The gap may be a relatively small distance, for example, 0.1mm to 0.5mm, or 0 to 10mm, or more than 10mm, and may be adjusted according to actual needs. Wherein the contacting may be a bonding, or a partial bonding.
An included angle between at least one side light emitting surface 1023 of the light emitting unit 102 and the bottom surface 1022 is an acute angle, that is, an included angle between one side light emitting surface 1023 of the light emitting unit 102 and the bottom surface 1022 may be an acute angle, an included angle between two side light emitting surfaces 1023 of the light emitting unit 102 and the bottom surface 1022 may be an acute angle, an included angle between three side light emitting surfaces 1023 of the light emitting unit 102 and the bottom surface 1022 may be an acute angle, or an included angle between four side light emitting surfaces 1023 of the light emitting unit 102 and the bottom surface 1022 may be an acute angle (as shown in fig. 4, the four side light emitting surfaces 1023 and the bottom surface 1022 are.
Note that the light emitting unit 102 may be a white light emitting unit. Different colors can be selected to be mixed into white light according to requirements.
According to an embodiment of the present invention, each light emitting unit 102 includes at least two different light emitting colors, and the mixed light of each light emitting unit 102 or the mixed light of two adjacent light emitting units 102 is white.
It is understood that, for one, each light emitting unit 102 includes at least two different light emitting colors, and the mixed light of each light emitting unit 102 is white, for example, the light emitting color may include two colors of magenta and green, or may include two colors of yellow and blue, or may include two colors of red and cyan, or may include three colors of red, green and blue. Secondly, each light emitting unit 102 includes at least two different light emitting colors, and the mixed light of two adjacent light emitting units 102 is white. Wherein, the color of the emergent light can be one of red, green and blue. For example, the light emitting color of each light emitting unit 102 may include two colors of red and green, or may include two colors of red and blue, or may include two colors of green and blue, and the two adjacent light emitting units 102 include three colors of red, green and blue.
The half-wave widths of different emergent light colors are smaller than that of the white light, the narrower the half-wave width of the color is, the higher the purity of the color is, the half-wave width of the white light after various different colors are mixed is smaller than that of the white light, and the purity of the mixed white light is higher than that of the common white light, so that the high color gamut can be realized. In addition, by arranging at least two different light emitting colors in each light emitting unit 102, the ratio of the colors can be controlled, so that the mixed light of each light emitting unit 102 or the mixed light of two adjacent light emitting units 102 can be mixed into white more easily. Moreover, each light emitting unit 102 is provided with at least two different light emitting colors, so that the colors in a unit area are more in variety and more uniform in mixing, and the chromaticity uniformity and the brightness uniformity are better.
According to an embodiment of the present invention, as shown in fig. 4, the light emitting unit 102 includes four side light emitting surfaces 1023; the light emitting unit 102 has a quadrangular frustum structure.
According to an embodiment of the present invention, as shown in fig. 5, the light emitting unit 102 includes a blue light source; the light emitting color of the top light emitting surface of each light emitting unit 102 is blue; the plurality of light emitting units 102 includes a first light emitting unit 104 and a second light emitting unit 105; the first light emitting unit 104 and the second light emitting unit 105 are arranged at intervals along the array row direction and/or the array column direction;
the adjacent side light emitting faces of the adjacent first light emitting unit 104 and the second light emitting unit 105 differ in light emission color.
In fig. 5, a circle a represents the first light-emitting unit 104, and a circle B represents the second light-emitting unit 105. Preferably, the first light emitting unit 104 and the second light emitting unit 105 are arranged at intervals in the row direction and the column direction; because the light emitting colors of the adjacent side light emitting surfaces of the first light emitting unit 104 and the second light emitting unit 105 are different, further, the light emitting colors of the adjacent side light emitting surfaces of the adjacent first light emitting unit 104 and the adjacent second light emitting unit 105 can realize light mixing. In other embodiments, the first light emitting units 104 and the second light emitting units 105 may be arranged at intervals only in the row direction or only in the column direction, so that only the light emitting colors of the adjacent side light emitting surfaces of the first light emitting units 104 and the second light emitting units 105 adjacent to each other in the row direction or the column direction realize light mixing.
According to an embodiment of the present invention, as shown in fig. 6, the light color of the side light emitting face in the first light emitting unit 104 is green; the light emission color of the side light emission surface of the second light emission unit 105 is red.
That is, the light emission colors of the four side light emitting surfaces of the first light emitting unit 104 are all green, and the light emission colors of the four side light emitting surfaces of the second light emitting unit 105 are all red. The light emission colors of the top light emitting surfaces of the first light emitting unit 104 and the second light emitting unit 105 are both blue. In fig. 6, a region a is a light-emitting region on the top light-emitting surface of the first light-emitting unit 104, and a region b is a light-mixing region between the first light-emitting unit 104 and the second light-emitting unit 105. It should be noted that, the included angle between the side light emitting surfaces and the bottom surface of the light emitting units and the light emitting brightness of the side light emitting surfaces of each light emitting unit can be adjusted according to actual conditions, so that the brightness of the light emitting areas of the light mixing area and the top light emitting surface is substantially equal. Thereby making the display brightness of the display panel including the backlight module 100 more uniform. Moreover, the same light emitting unit emits light of two colors, the half-wave width of each color is narrower than the half-wave width of the white light, and further, the half-wave width of the white light mixed by two adjacent light emitting units is narrower than the half-wave width of the common white light, so that the color gamut is favorably improved.
Here, in this embodiment, the adjacent first and second light-emitting units 104 and 105 can be viewed as one light-emitting unit group, and the luminance of each light-emitting unit group is equal. Furthermore, the uniformity of the display brightness of the display screen of the display panel comprising the backlight module is better.
It is understood that, as shown in fig. 5 and 6 in conjunction, side light emitting surfaces adjacent to the first and second light emitting units 104 and 105 adjacent to each other are mixed with each other in the row direction, and side light emitting surfaces adjacent to the first and second light emitting units 104 and 105 adjacent to each other are mixed with each other in the column direction. The light emitting color of the side light emitting surface of the first light emitting unit 104 is green, the light emitting color of the side light emitting surface of the second light emitting unit 105 is red, the light emitting colors of the top light emitting surfaces are blue, the angles of the side light emitting surface and the bottom surface are adjusted according to actual conditions, and the light emitting intensity of each color is adjusted, for example: for the first light emitting unit 104 and the second light emitting unit 105 as a light emitting unit group, the ratio of the red, green and blue light intensities as a whole can be 3:6:1, and since the mixed light with the ratio of the red, green and blue light intensities being approximately 3:6:1 is white light, the mixed light of the light emitting module composed of the first light emitting unit 104 and the second light emitting unit 105 is white light. Because the colour in the luminescence unit group is more than two to the light-emitting colour of adjacent side light emitting face is different, makes the mixed light more even, thereby including this backlight unit's the display color homogeneity of display panel on the display screen better, luminance homogeneity is better.
In a specific embodiment, according to an embodiment of the present invention, the light emitting intensity of the top light emitting surface of the light emitting unit accounts for 7% -13% of the total light emitting intensity, and the light emitting intensity of the side light emitting surface accounts for 19.5% -25.5% of the total light emitting intensity; the light emission intensity of the first light emitting unit 104 is twice the light emission intensity of the second light emitting unit 105.
According to one embodiment of the invention, the included angle α between the side light emitting surface and the bottom surface is in a range of 35 ° to 75 °.
Preferably, an angle between a side light emitting surface and a bottom surface of the first light emitting unit 104 is preferably 55 °, an angle between a side light emitting surface and a bottom surface of the second light emitting unit 105 is preferably 55 °, a total light emitting intensity of the first light emitting unit 104 is twice of a total light emitting intensity of the second light emitting unit 105, a light emitting intensity of a top light emitting surface of the first light emitting unit 104 accounts for 10% of the total light emitting intensity of the first light emitting unit 104, a light emitting intensity of a top light emitting surface of the second light emitting unit 105 accounts for 10% of the total light emitting intensity of the second light emitting unit 105, a light emitting intensity of each side light emitting surface of the first light emitting unit 104 accounts for 22.5% of the total light emitting intensity of the first light emitting unit 104, a light emitting intensity of each side light emitting surface of the second light emitting unit 105 accounts for 22.5% of the total light emitting intensity of the second light emitting unit 105, and a ratio of red, green and blue light emitting intensities of the whole light emitting module composed of the first light emitting unit 104 and the second, because the mixed light with the luminous intensity ratio of red, green and blue being approximately 3:6:1 is white light, the effect that the mixed light is white light can be realized. Furthermore, the display color uniformity and the brightness uniformity on the display screen of the display panel comprising the backlight module are better.
According to one embodiment of the present invention, the side light emitting surface of the first light emitting unit 104 is provided with green phosphor; a side light emitting surface of the second light emitting unit 105 is provided with red phosphor or new red phosphor.
On the basis of the foregoing example, the light sources of the first light emitting unit 104 and the second light emitting unit 105 are blue light sources, and after the green phosphor is disposed on the side light emitting surface of the first light emitting unit 104, the light emitting color of the side light emitting surface of the first light emitting unit 104 is green, and similarly, after the red phosphor or the new red phosphor is disposed on the side light emitting surface of the second light emitting unit 105, the light emitting color of the side light emitting surface of the second light emitting unit 105 is red. In this example, the overall achieved color gamut is less than or equal to 93% DCI-P3. The light emission intensity of each light emitting surface can be adjusted by adjusting the concentration of the phosphor and the thickness of the coating.
According to one embodiment of the present invention, the side light emitting surface of the light emitting unit is provided with a green quantum dot layer, and the side light emitting surface of the second light emitting unit is provided with a red quantum dot layer.
On the basis of the foregoing example, the light sources of the first light emitting unit 104 and the second light emitting unit 105 are blue light sources, and the light emission color of the side light emitting surface of the first light emitting unit 104 is green after the green quantum dot layer is provided on the side light emitting surface of the first light emitting unit 104, and similarly, the light emission color of the side light emitting surface of the second light emitting unit 105 is red after the red quantum dot layer is provided on the side light emitting surface of the second light emitting unit 105. In the example, the half-wave width of light excited by the quantum dots is narrower, the purity of the emitted light is higher, and the overall achieved color gamut is greater than 94% DCI-P3, namely the example can achieve the effect of high color gamut. The light emission intensity of each light emitting surface can be adjusted by adjusting the concentration of the quantum dot layer and the thickness of the coating.
In addition, when the green quantum dot layer is provided on the side light emitting surface of the first light emitting unit 104, a mixed material of the green quantum dots and the epoxy resin may be included, and when the red quantum dot layer is provided on the side light emitting surface of the second light emitting unit 105, a mixed material of the red quantum dots and the epoxy resin may be included.
According to one embodiment of the present invention, the green quantum dot layer and the red quantum dot layer each include at least one of a perovskite material, an inorganic perovskite material, and an inorganic-organic hybrid perovskite material.
In the foregoing examples, a novel hybrid perovskite quantum dot material, the core of which is formed of R1NH3AB3 or (R2NH3)2AB4, R1 is methyl, R2 is an organic molecular group, a is at least one selected from Ge, Sn, Pb, Sb, Bi, Cu, or Mn, B is at least one selected from Cl, Br, and I, a and B constitute a coordination octahedral structure, R1NH3 or R2NH3 is filled in the gap of the coordination octahedral structure, and the surface ligand is an organic acid or an organic amine. Compared with the prior inorganic quantum dot material, the hybrid quantum dot material has very high quantum yield, narrower half-peak width and higher luminescent color purity. And because the organic-inorganic hybrid perovskite material combines the advantages of organic and inorganic materials, the organic-inorganic hybrid perovskite material not only has good thermal stability, mechanical property and electromagnetic property of inorganic components, but also has the advantages of easy processing and film forming of organic components and the like, and the preparation process is relatively simple. Similar perovskite materials are also inorganic perovskite and inorganic-organic hybrid perovskite materials, which have chemical formulas mainly of inorganic perovskite CsPbX3(x ═ Cl/Br/I) and organic-inorganic hybrid perovskite materials CH3NH3PbX3(x ═ Cl/Br/I), CH3NH3PbX3(x ═ Cl/Br/I). Therefore, at least one of perovskite materials, inorganic perovskite materials and inorganic-organic hybrid perovskite materials is added into the red quantum dot layer and the green quantum dot layer, and the perovskite materials have great advantages when being applied to backlight, so that not only can high color gamut be realized, but also the backlight cost can be greatly reduced.
According to one embodiment of the present invention, the first light emitting unit 104 includes a first side light emitting face, a second side light emitting face, a third side light emitting face, and a fourth side light emitting face; the first side luminous surface and the second side luminous surface are oppositely arranged; the third side luminous surface and the fourth side luminous surface are oppositely arranged; the second light emitting unit 105 includes a fifth side light emitting face, a sixth side light emitting face, a seventh side light emitting face, and an eighth side light emitting face; the fifth side light emitting surface and the sixth side light emitting surface are oppositely arranged; the seventh side luminous surface and the eighth side luminous surface are oppositely arranged; the light emitting colors of the first side light emitting surface and the second side light emitting surface are red; the light emitting colors of the third side light emitting surface and the fourth side light emitting surface are green; the light emitting colors of the fifth side light emitting surface and the sixth side light emitting surface are green; the light emitting colors of the seventh side light emitting face and the eighth side light emitting face are red.
That is, in the orientation of the quadrangular frustum shown in fig. 4, the first side light emitting surface of the first light emitting unit 104 may be a left side light emitting surface, the second side light emitting surface may be a right side light emitting surface, the third side light emitting surface may be a front side light emitting surface, and the fourth side light emitting surface may be a rear side light emitting surface, wherein the light emitting colors of the left side light emitting surface and the right side light emitting surface are red, and the front side light emitting surface and the rear side light emitting surface are green. The fifth side light emitting surface of the second light emitting unit 105 may be a left side light emitting surface, the sixth side light emitting surface may be a right side light emitting surface, the seventh side light emitting surface may be a front side light emitting surface, and the eighth side light emitting surface may be a rear side light emitting surface, wherein the light emitting colors of the left side light emitting surface and the right side light emitting surface are green, and the front side light emitting surface and the rear side light emitting surface are red.
Note that red phosphor or new red phosphor is provided on the first side light emitting surface and the second side light emitting surface of the first light emitting unit 104, and green phosphor is provided on the third side light emitting surface and the fourth side light emitting surface, or a red quantum dot layer is provided on the first side light emitting surface and the second side light emitting surface, and a green quantum dot layer is provided on the third side light emitting surface and the fourth side light emitting surface.
Green phosphors are disposed on the fifth side light emitting surface and the sixth side light emitting surface of the second light emitting unit 105, and red phosphors or new red phosphors are disposed on the seventh side light emitting surface and the eighth side light emitting surface, or green quantum dot layers are disposed on the fifth side light emitting surface and the sixth side light emitting surface, and red quantum dot layers are disposed on the seventh side light emitting surface and the eighth side light emitting surface.
In addition, the light emission color of the left and right light emitting surfaces of the first light emitting unit 104 may be green, and the front and rear light emitting surfaces may be red. The light emission color of the left and right light emitting surfaces of the second light emitting unit 105 is red, and the front and rear light emitting surfaces are green. It is sufficient that the adjacent side light emitting surfaces of the adjacent first light emitting unit 104 and the second light emitting unit 105 have different light emission colors. Therefore, the color mixing of each light-emitting unit can be more uniform, and the image quality of the display screen is better.
It should be noted that, green phosphor is disposed on the first side light emitting surface and the second side light emitting surface of the first light emitting unit 104, and red phosphor or new red phosphor is disposed on the third side light emitting surface and the fourth side light emitting surface, or a green quantum dot layer is disposed on the first side light emitting surface and the second side light emitting surface, and a red quantum dot layer is disposed on the third side light emitting surface and the fourth side light emitting surface.
Red phosphor or new red phosphor is disposed on the fifth side light emitting surface and the sixth side light emitting surface of the second light emitting unit 105, and green phosphor is disposed on the seventh side light emitting surface and the eighth side light emitting surface, or a red quantum dot layer is disposed on the fifth side light emitting surface and the sixth side light emitting surface, and a green quantum dot layer is disposed on the seventh side light emitting surface and the eighth side light emitting surface.
Here, the arrangement of the first light emitting unit 104 and the second light emitting unit 105 in this example is preferably still the arrangement illustrated in fig. 5. I.e., in the row direction and the column direction, the first light emitting unit 104 is arranged at an interval from the second light emitting unit 105. The light emitting unit group area composed of the first light emitting unit 104 and the second light emitting unit 105 in this example has more colors, and the light after mixing is more uniform, so that the color gamut of this example is high, the light mixing is uniform, and the uniformity of the light chromaticity is good.
According to one embodiment of the present invention, as shown in fig. 7 and 8, a plurality of white light auxiliary light sources 106 are further included; the first light emitting unit 104, the second light emitting unit 105, and the white auxiliary light source 106 are sequentially and periodically arranged along the array row direction and/or the array column direction.
As shown in fig. 7, in which the circle a represents the first light-emitting unit 104, the circle B represents the second light-emitting unit 105, and the circle white represents the white auxiliary light source 106, the first light-emitting unit 104, the second light-emitting unit 105, and the white auxiliary light source 106 are sequentially and periodically arranged along the row direction and the column direction of the array. Since the outer sides of the white light auxiliary light sources 106 are coated with the YAG fluorescent powder, the photoelectric conversion efficiency of the YAG fluorescent powder is higher than that of fluorescent powder of other colors and quantum dots, and further, the example can improve the light efficiency and has higher cost performance, and the color gamut is higher than 95% DCI-P3.
As shown in fig. 8, the first light emitting unit 104, the second light emitting unit 105, and the white auxiliary light source 106 are sequentially and periodically arranged only in the row direction of the array.
In addition, the first light emitting unit 104, the second light emitting unit 105, and the white auxiliary light source 106 may be sequentially and periodically arranged only in the column direction of the array (not shown in the figure).
The cost can be reduced by replacing one of the light emitting units with the white light auxiliary light source 106, wherein the white light auxiliary light source 106 can be in a quadrangular frustum pyramid structure.
According to one embodiment of the present invention, as shown in fig. 9 and 10, a plurality of white light auxiliary light sources 106 are further included; a plurality of white light auxiliary light sources 106 are positioned between two adjacent rows and/or two adjacent columns of light emitting cells.
As shown in fig. 9, the plurality of white auxiliary light sources 106 are only located between the light emitting units of two adjacent rows.
As shown in fig. 10, the plurality of white auxiliary light sources 106 are only located between the light emitting units of two adjacent columns.
In addition, a plurality of white auxiliary light sources 106 may be positioned between two adjacent rows or two columns of light emitting units. It should be noted that, in the backlight module, at least one row and/or one column of white light auxiliary light sources 106 are disposed, and each row of white light auxiliary light sources 106 is located between two adjacent rows of light emitting units. Each column of white light auxiliary light sources 106 is located between two adjacent columns of light emitting units.
The YAG fluorescent powder is coated on the outer side of the white light auxiliary light source 106, and the photoelectric conversion efficiency of the YAG fluorescent powder is higher than that of fluorescent powder of other colors and quantum dots, so that the light efficiency can be improved by adding one row of white light auxiliary light sources 106 or one row of white light auxiliary light sources 106, the cost performance is high, the cost can be reduced, and the color gamut can reach 95% DCI-P3 at most.
According to an embodiment of the present invention, as shown in fig. 11, the light emitting unit 202 includes three side light emitting surfaces; the light emitting unit 202 has a triangular mesa structure. The light emitting unit 202 includes a top light emitting face 2021, three side light emitting faces 2023, and a bottom face 2022.
According to one embodiment of the present invention, the light emitting unit 202 includes a blue light source; the light emitting color of the top light emitting surface is white, the light emitting colors of the three side light emitting surfaces are red, green and blue respectively, and the plurality of light emitting units are arranged in an array.
As shown in fig. 12, the light emitting units 202 are represented by circles C, and the light emitting units 202 are arranged in an array. The light emitting units 202 include a red side light emitting surface, a green side light emitting surface, a blue side light emitting surface and a white top light emitting surface, and the brightness of each light emitting unit 202 can be more uniform by adjusting the light emitting intensity of each side light emitting surface. It should be noted that, the light emitting colors of the adjacent side light emitting surfaces of the two adjacent light emitting units are different, so that a better light mixing effect can be achieved.
According to one embodiment of the present invention, the light emission intensity of the top emission surface accounts for 22% to 28% of the total light emission intensity of the light emission unit, the light emission intensity of the red side emission surface accounts for 19.5% to 25.5% of the total light emission intensity of the light emission unit, the light emission intensity of the green side emission surface accounts for 42% to 48% of the total light emission intensity of the light emission unit, and the light emission intensity of the blue side emission surface accounts for 4.5% to 10.5% of the total light emission intensity of the light emission unit.
According to one embodiment of the invention, the included angle between the side light emitting surface and the bottom surface ranges from 35 degrees to 90 degrees.
Preferably, the light emission intensity of the top emission surface of each light emission unit 202 accounts for 25% of the total light emission intensity of the light emission unit, the light emission intensity of the red side emission surface accounts for 22.5% of the total light emission intensity of the light emission unit, the light emission intensity of the green side emission surface accounts for 45% of the total light emission intensity of the light emission unit, and the light emission intensity of the blue side emission surface accounts for 7.5% of the total light emission intensity of the light emission unit. The angle between the side light emitting surface and the bottom surface of each light emitting unit 202 is 45 °.
With the above arrangement, the ratio of the red, green, and blue emission intensities of each light-emitting unit 202 can be made approximately 3:6: 1. Since the mixed light with the red, green and blue luminous intensity ratio of approximately 3:6:1 is white light, each light emitting unit 202 can be made to mix light into white light, so that the display color of the display screen is more uniform, and the display brightness is more uniform.
According to an embodiment of the present invention, the three side light emitting faces are a red side light emitting face, a green side light emitting face, and a blue side light emitting face, respectively; YAG fluorescent powder is arranged on the top light emitting surface; the red side luminous surface is provided with red fluorescent powder or new red fluorescent powder, and the green side luminous surface is provided with green fluorescent powder. The color gamut can be achieved to 93% DCI-P3 by setting the phosphors.
According to an embodiment of the present invention, the three side light emitting faces are a red side light emitting face, a green side light emitting face, and a blue side light emitting face, respectively; the top luminous surface is provided with a red, green and blue quantum dot layer, the red side luminous surface is provided with a red quantum dot layer, and the green side luminous surface is provided with a green quantum dot layer. By arranging the quantum dot layer, the color gamut can be larger than 94% DCI-P3 due to narrower half-wave width and higher luminescent color purity of light excited by the quantum dots, so that high color gamut is realized.
Note that in the foregoing example, the light emission intensity of the light emitting surface of each light emitting unit 202 can be controlled by adjusting the angle between the side light emitting surface and the bottom surface of the light emitting unit 202, and the thickness and concentration of the applied phosphor, or the thickness and concentration of the applied quantum dot layer.
According to an embodiment of the present invention, as shown in fig. 13, a plurality of white light auxiliary light sources 203 are further included; a plurality of white light auxiliary light sources 203 are positioned between two adjacent rows and/or two adjacent columns of light emitting cells.
According to an embodiment of the present invention, as shown in fig. 13, a plurality of white light auxiliary light sources 203 are located at the midpoints of the diagonal lines of adjacent four light emitting units 202. The arrangement shown in fig. 13 can improve light efficiency.
According to one embodiment of the invention, a diffusing particle layer is disposed on the top light emitting face.
In the foregoing example, the top light emitting surface of each of the quadrangular frustum light emitting units and the triangular frustum light emitting unit is provided with the diffusion particle layer, so that the light in the middle region is more uniform.
In addition, the maximum size of the outer shape of each quadrangular frustum light-emitting unit or triangular frustum light-emitting unit, i.e., the package size, is less than or equal to 3 mm x3 mm, the side length of each side is greater than or equal to 50 micrometers and less than or equal to 200 micrometers, preferably 70 micrometers, and the height is greater than or equal to 20 micrometers and less than or equal to 40 micrometers, preferably 20 micrometers.
Fig. 14 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 14, the display panel 200 according to the embodiment of the invention includes the backlight module 100 as described above. The display panel 200 further includes a display module 204. The display panel 200 including the backlight module 100 as described above can achieve more uniform color and more uniform brightness.
In summary, according to the backlight module and the display panel provided by the embodiments of the present invention, the backlight module includes a reflective sheet, a diffuser plate and a plurality of light emitting units, each of the light emitting units is disposed between the reflective sheet and the diffuser plate, each of the light emitting units includes a top light emitting surface, a bottom surface and a plurality of side light emitting surfaces, which are substantially parallel to the diffuser plate, a vertical projection of the top light emitting surface on the diffuser plate is smaller than a vertical projection of the bottom surface on the diffuser plate, a gap or a contact exists between the top light emitting surface and the diffuser plate, and an included angle between at least one of the side light emitting surfaces and the bottom surface is an acute angle, so that a goal of good luminance uniformity, better image quality effect and thinner liquid crystal display product thickness can be.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (22)
1. A backlight module is characterized by comprising a reflector plate, a diffusion plate and a plurality of light-emitting units, wherein each light-emitting unit is arranged between the reflector plate and the diffusion plate and comprises a top light-emitting surface, a bottom surface and a plurality of side light-emitting surfaces which are generally parallel to the diffusion plate, the vertical projection of the top light-emitting surfaces on the diffusion plate is smaller than that of the bottom surface on the diffusion plate, a gap exists between the top light-emitting surfaces and the diffusion plate, or at least one side light-emitting surface is in contact with the diffusion plate, and the included angle between the side light-emitting surfaces and the bottom surface is an acute angle.
2. A backlight module according to claim 1, wherein each of the light-emitting units comprises at least two different colors of emergent light; and the mixed light of each light-emitting unit or the mixed light of two adjacent light-emitting units is white.
3. A backlight module according to claim 2, wherein the light emitting unit comprises four side light emitting faces; the light-emitting unit is in a quadrangular frustum pyramid structure.
4. A backlight module according to claim 3, wherein the light emitting unit comprises a blue light source; the light emitting color of the top light emitting surface of each light emitting unit is blue; the plurality of light emitting units comprise a first light emitting unit and a second light emitting unit; the first light-emitting units and the second light-emitting units are arranged at intervals along the row direction and/or the column direction of the array;
the light emitting colors of adjacent side light emitting faces of the adjacent first light emitting unit and the adjacent second light emitting unit are different.
5. The backlight module according to claim 4, wherein the light emitting color of the side light emitting surface in the first light emitting unit is green; and the light emitting color of the side light emitting surface of the second light emitting unit is red.
6. The backlight module according to claim 5, wherein a side light emitting surface of the first light emitting unit is provided with green phosphor; and a red fluorescent powder or new red fluorescent powder is arranged on the side light-emitting surface of the second light-emitting unit.
7. The backlight module as claimed in claim 5, wherein the side light emitting surface of the light emitting unit is provided with a green quantum dot layer, and the side light emitting surface of the second light emitting unit is provided with a red quantum dot layer.
8. The backlight module according to any one of claims 5-7, wherein the luminous intensity of the top luminous surface of the luminous unit accounts for 7% -13% of the total luminous intensity, and the luminous intensity of the side luminous surface accounts for 19.5% -25.5% of the total luminous intensity; the first light emitting unit has a light emission intensity twice as high as that of the second light emitting unit.
9. The backlight module of claim 7, wherein the green quantum dot layer and the red quantum dot layer each comprise at least one of a perovskite material, an inorganic perovskite material, and an inorganic-organic hybrid perovskite material.
10. The backlight module according to claim 4, wherein the first light emitting unit comprises a first side light emitting face, a second side light emitting face, a third side light emitting face and a fourth side light emitting face; the first side light emitting surface and the second side light emitting surface are oppositely arranged; the third side luminous surface and the fourth side luminous surface are oppositely arranged; the second light emitting unit comprises a fifth side light emitting surface, a sixth side light emitting surface, a seventh side light emitting surface and an eighth side light emitting surface; the fifth side luminous surface and the sixth side luminous surface are oppositely arranged; the seventh side luminous surface and the eighth side luminous surface are oppositely arranged; the light emitting colors of the first side light emitting surface and the second side light emitting surface are red; the light emitting colors of the third side light emitting surface and the fourth side light emitting surface are green; the light emitting colors of the fifth side light emitting surface and the sixth side light emitting surface are green; the light emitting color of the seventh side light emitting surface and the eighth side light emitting surface is red.
11. The backlight module according to claim 4, further comprising a plurality of white light auxiliary light sources; the first light emitting unit, the second light emitting unit and the white light auxiliary light source are sequentially and periodically arranged along the array row direction and/or the array column direction.
12. A backlight module according to claim 3, wherein the side light emitting surface forms an angle with the bottom surface in the range of 35 ° to 75 °.
13. A backlight module according to claim 2, wherein the light emitting unit comprises three side light emitting faces; the light-emitting unit is of a triangular frustum structure.
14. A backlight module according to claim 13, wherein the light-emitting unit comprises a blue light source; the light emitting color of the top light emitting surface is white, the light emitting colors of the three side light emitting surfaces are red, green and blue respectively, and the light emitting units are arranged in an array.
15. A backlight module according to claim 13, wherein the three side light emitting faces are a red side light emitting face, a green side light emitting face and a blue side light emitting face; the top light-emitting surface is provided with YAG fluorescent powder; the red side light-emitting surface is provided with red fluorescent powder or new red fluorescent powder, and the green side light-emitting surface is provided with green fluorescent powder.
16. A backlight module according to claim 13, wherein the three side light emitting faces are a red side light emitting face, a green side light emitting face and a blue side light emitting face; the LED module comprises a top light-emitting surface, a red side light-emitting surface and a green side light-emitting surface, wherein the top light-emitting surface is provided with a red green blue quantum dot layer, the red side light-emitting surface is provided with a red quantum dot layer, and the green side light-emitting surface is provided with a green quantum dot layer.
17. The backlight module according to any one of claims 14-16, wherein the top emission surface has a luminous intensity of 22-28%, the red side emission surface has a luminous intensity of 19.5-25.5%, the green side emission surface has a luminous intensity of 42-48%, and the blue side emission surface has a luminous intensity of 4.5-10.5%.
18. A backlight module according to claim 13, wherein the side light emitting surfaces form an angle with the bottom surface ranging from 35 ° to 90 °.
19. The backlight module according to claim 4 or 14, further comprising a plurality of white light auxiliary light sources; the plurality of white light auxiliary light sources are positioned between two adjacent rows and/or two adjacent columns of the light emitting units.
20. A backlight module according to claim 19, wherein a plurality of the white light auxiliary light sources are located at midpoints of diagonal lines of adjacent four of the light emitting units.
21. A backlight module according to claim 1, wherein the top light emitting surface is provided with a layer of diffusing particles.
22. A display panel comprising the backlight module according to any one of claims 1-21.
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| CN116430622A (en) * | 2023-04-26 | 2023-07-14 | 富盛光电（吴江）有限公司 | Light diffusion plate and direct type backlight module |
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Application publication date: 20210618 |