CN111240095A - Backlight module and display panel - Google Patents
Backlight module and display panel Download PDFInfo
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- CN111240095A CN111240095A CN202010170864.3A CN202010170864A CN111240095A CN 111240095 A CN111240095 A CN 111240095A CN 202010170864 A CN202010170864 A CN 202010170864A CN 111240095 A CN111240095 A CN 111240095A
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
The application discloses a backlight module and a display panel, wherein the backlight module and the display panel respectively comprise a light conversion functional layer; the light conversion function layer comprises a quantum dot light conversion layer and a scattering film layer arranged on at least one side of the quantum dot light conversion layer and used for enlarging the light outlet angle of the light conversion function layer. The application provides a backlight unit and display panel all can enlarge the visual angle to about 120, can improve big visual angle colour cast simultaneously, are favorable to the preparation to have the display device at wide visual angle.
Description
Technical Field
The application relates to the technical field of display panels, in particular to a backlight module and a display panel.
Background
The backlight is a light source located behind a Liquid Crystal Display (LCD) panel, and can affect the Display effect of the LCD. The backlight may be classified into an electroluminescent, Cold Cathode Fluorescent Lamp (CCFL) and a Light Emitting Diode (LED) according to a Light source used in the backlight. The backlight sources are classified into edge type and direct type backlight sources according to the installation position of the light source.
Taking a direct type backlight source as an example, an LED backlight source of a conventional quantum dot display structure sequentially includes an LED, a light guide plate, a quantum dot Film (QD Film), and a prism Film. The light emitted by the LED is uniformly emitted through the light guide plate and then is emitted through the quantum dot film and the prism film. The quantum dot film is used for providing quantum dots, the quantum dots can emit light under the excitation of light (such as blue light) emitted by the LED, and the light emitted by the quantum dots and the light emitted by the LED are mixed to form white light so as to provide a light source for the liquid crystal display.
The viewing angle of a common liquid crystal display is about 60 degrees, the viewing angle of the liquid crystal display after the quantum dot film is applied to the backlight module is about 80 degrees, and the viewing angle is improved. However, as the size of the liquid crystal display is increased, the probability of viewing the display screen from the side is increased, and the 80 ° viewing angle cannot meet the requirement, so that the development of a display device having a wide viewing angle is urgently needed.
Disclosure of Invention
The application provides a backlight unit and display panel can enlarge the visual angle to about 120, can improve big visual angle colour cast simultaneously, is favorable to the preparation to have the display device at wide visual angle.
On one hand, the application provides a backlight module, which comprises a light guide plate and a light conversion functional layer positioned on the light emergent side of the light guide plate; the light conversion function layer comprises a quantum dot light conversion layer and a scattering film layer arranged on at least one side of the quantum dot light conversion layer and used for enlarging the light outlet angle of the light conversion function layer.
Optionally, the backlight module further includes a prism film and a reflective polarization brightness enhancement film sequentially disposed on one side of the light conversion functional layer away from the light guide plate.
Optionally, the scattering film layer includes a first carrier layer and scattering particles dispersed in the first carrier layer.
Optionally, the material of the scattering particles comprises titanium dioxide; the refractive index of the scattering particles is greater than 1.5; the scattering particles have a diameter in the range of 200 to 1000 nanometers.
Optionally, the mass fraction of the scattering particles in the scattering film layer ranges from 3% to 50%; the thickness of the scattering film layer ranges from 5 to 50 microns.
On the other hand, the application also provides a display panel, which comprises a light conversion functional layer, and a polaroid and a display functional layer which are sequentially arranged on the light conversion functional layer; the light conversion function layer comprises a quantum dot light conversion layer and a scattering film layer arranged on at least one side of the quantum dot light conversion layer and used for enlarging the light outlet angle of the light conversion function layer.
Optionally, the display panel further includes a prism film located between the light conversion functional layer and the polarizer, and a reflective polarization brightness enhancement film located between the prism film and the polarizer.
Optionally, the scattering film layer includes a first carrier layer and scattering particles dispersed in the first carrier layer.
Optionally, the material of the scattering particles comprises titanium dioxide; the refractive index of the scattering particles is greater than 1.5; the scattering particles have a diameter in the range of 200 to 1000 nanometers.
Optionally, the mass fraction of the scattering particles in the scattering film layer ranges from 3% to 50%; the thickness of the scattering film layer ranges from 5 to 50 microns
The backlight module and the display panel both comprise a light conversion functional layer, the light conversion functional layer comprises a quantum dot light conversion layer with a visual angle increasing effect, and a scattering film layer positioned on at least one side of the quantum dot light conversion layer, and scattering particles in the scattering film layer have a light diffusion effect, so that the visual angle can be further increased, the visual angle reaches about 120 degrees, meanwhile, the color cast of a large visual angle can be improved, the wide visual angle display requirement is met, and further, the display device can achieve a wide visual angle effect; in addition, the backlight module and the display panel provided by the application are also provided with the prism film and the reflection type polarization brightness enhancement film on the light emitting side of the light conversion function layer, and the composite structure of the prism film and the reflection type polarization brightness enhancement film has the characteristic of low polarization loss, so that the brightness can be effectively improved, the display brightness is prevented from being improved by increasing the brightness of a light emitting source, and the energy consumption and the cost are favorably saved; therefore, the present application is advantageous for manufacturing a display device having a wide viewing angle, high brightness, and low power consumption.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of another display panel provided in the embodiment of the present application.
Fig. 7 is a schematic structural diagram of another display panel provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
As shown in fig. 1, the present embodiment provides a direct-type backlight module 1, where the backlight module 1 includes a light source 2, a light guide plate 3 located at a light exit side of the light source 2, and an optical conversion function layer 4 located at the light exit side of the light guide plate 3 (i.e. the optical conversion function layer 4 is located at a side of the light guide plate 3 away from the light source 2); the light conversion function layer 4 includes a quantum dot light conversion layer 41 and scattering film layers 42 disposed on two sides of the quantum dot light conversion layer 41, and is used to enlarge the light emitting angle of the backlight module 1.
Specifically, the scattering film layer 42 is disposed on one side of the quantum dot light conversion layer 41 close to the light guide plate 3, and one side of the quantum dot light conversion layer 41 far from the light guide plate 3; and the quantum dot light conversion layer 41 becomes a composite film in a composite manner with the light guide plate 3 and the scattering film layer 42.
Specifically, the scattering film layer 42 includes a first carrier layer and scattering particles dispersed in the first carrier layer. Wherein, the first carrier is transparent resin organic matter, such as UV (ultraviolet) curing adhesive or pressure-sensitive adhesive; the material of the scattering particles comprises titanium dioxide; the refractive index of the scattering particles is greater than 1.5; the diameter of the scattering particles ranges from 200 to 1000 nanometers, and the mass fraction of the scattering particles in the scattering film layer 42 ranges from 3% to 50%; the thickness of the scattering film layer 42 ranges from 5 to 50 microns.
Specifically, the light emission source 2 includes a blue light source; the specific structure of the blue light source comprises a back plate 21 and a plurality of LED light emitting units 22 arranged on one side of the back plate 21 close to the light guide plate 3 and distributed in an array manner, and the LED light emitting units are used for emitting blue light; of course, the LED lighting unit 22 may be replaced by a Mini-LED lighting unit. Correspondingly, the quantum dot light conversion layer 41 includes a second carrier layer, and red light quantum dots and green light quantum dots dispersed in the second carrier layer; the second carrier layer is a transparent organic material of the resin type and may be the same as the material of the first carrier layer. The red light quantum dots and the green light quantum dots respectively emit red light and green light under the excitation of the blue light, and the excited red light and green light are mixed with the blue light emitted by the blue light source to form white light which can be used as a backlight source of the liquid crystal display panel.
Of course, the light emitting source 2 may also be an ultraviolet light source; namely, a plurality of LED light-emitting units or Mini-LED light-emitting units which are arranged on one side of the back plate close to the light guide plate and distributed in an array emit ultraviolet light. Correspondingly, the quantum dot light conversion layer 41 includes a second carrier layer, and red, green, and blue quantum dots dispersed in the second carrier layer. The red light quantum dots, the green light quantum dots and the blue light quantum dots respectively emit red light, green light and blue light under the excitation of ultraviolet light, and the excited red light, green light and blue light are mixed into white light. It should be noted that, in order to avoid the damage of the redundant ultraviolet light to the eyes of the user, a light filtering film may be further disposed on the light emitting side of the light conversion functional layer 4 to filter out the ultraviolet light that is not converted.
Specifically, the quantum dots (for example, red, green, and blue quantum dots) in the quantum dot light conversion layer 41 include any one of core-shell structure quantum dots, composite quantum dots, and perovskite quantum dots. The quantum dot with the core-shell structure comprises a luminescent core and a protective shell layer, wherein the material of the luminescent core comprises ZnCdSe2、InP、Cd2SSe、CdSe、Cd2SeTe and InAs, and the material of the protective shell layer comprises CdS, ZnSe and ZnCdS2Any one or more of ZnS and ZnO. The composite quantum dot comprises a hydrogel loaded quantum dot structure or CdSe-SiO2. The quantum dots are divided into red light quantum dots, green light quantum dots and blue light quantum dots according to different luminescent colors, the materials of the red light quantum dots, the green light quantum dots and the blue light quantum dots can be the same, and the red light quantum dots, the green light quantum dots and the blue light quantum dots can emit light with different colors only by regulating and controlling the size of the quantum dots. Of course, the materials of the red light quantum dots, the green light quantum dots and the blue light quantum dots may also be different, and are not limited herein.
In this embodiment, the scattering film layers 42 are disposed on two sides of the quantum dot light conversion layer 41, and since the quantum dots in the quantum dot light conversion layer 41 have the effect of increasing the viewing angle, and the scattering particles in the scattering film layers 42 can further increase the viewing angle through the light diffusion effect, so that the viewing angle reaches about 120 °, and meanwhile, the color shift of the large viewing angle can be improved, the display requirement of the wide viewing angle can be met, and further, the display device can achieve the effect of the wide viewing angle; in addition, the quantum dot light conversion layer 41 is used in combination with the light guide plate 3 and the scattering film layer 42, so that barrier layers for blocking water and oxygen (protecting quantum dots) can be prevented from being arranged on two sides of the quantum dot light conversion layer 41, the using amount of an optical film is reduced, the structural design of the backlight module 1 is optimized, and the manufacturing cost is saved; in addition, the scattering film layer 42 and the quantum dot light conversion layer 41 are respectively provided with a first carrier layer and a second carrier layer, and the first carrier layer and the second carrier layer are transparent resin organic matters, so that the scattering film layer 42 and the quantum dot light conversion layer 41 are easy to obtain and prepare, and the mass production of the scattering film layer 42 and the quantum dot light conversion layer 41 is facilitated.
As shown in fig. 2, the present embodiment further provides a direct-type backlight module 10, which is different from the above embodiments in that the backlight module 10 further includes a prism film 51 and a reflective polarization brightness enhancement film 52 sequentially disposed on a side of the light conversion functional layer 4 away from the light guide plate 3.
Specifically, the prism film 51 and the reflection type polarization enhancement film 52 are composite film layers, also referred to as COP core layers 5. The reflective polarizing brightness enhancement film 52 may be replaced by other film layers with reflective brightness enhancement function. Of course, the light guide plate 3, the light conversion functional layer 4 and the COP core layer 5 may also be combined into a single composite film.
Specifically, when the backlight module 10 is assembled with a display panel to form a display device, the reflective polarized brightness enhancement film 52 on the backlight module 10 is disposed close to the lower polarizer of the display panel; the lower polarizer is specifically a polarizer on the side of the array substrate.
In this embodiment, the backlight module 10 has the advantages of increasing the viewing angle, optimizing the structure, saving the cost and being capable of mass production of the backlight module 1 of the above embodiment; in addition, because the COP core layer 5 has the characteristic of low polarization loss, the brightness can be effectively improved, the display brightness is prevented from being improved by increasing the brightness of the luminous source 2, and the energy consumption and the cost are saved; therefore, the backlight module 10 provided by the embodiment is beneficial to forming a display device which has a wide viewing angle, high brightness, low energy consumption and is suitable for mass production.
As shown in fig. 3 and 4, the present embodiment further provides a direct-type backlight module 100 and 100', which is different from the above embodiments in that the scattering film layer 42 in the light conversion functional layer 4 is disposed only on one side of the quantum dot light conversion layer 41. Specifically, as shown in fig. 3, the scattering film layer 42 may be disposed on a side of the quantum dot light conversion layer 41 close to the light guide plate 3, or, as shown in fig. 4, the scattering film layer 42 may be disposed on a side of the quantum dot light conversion layer 41 far from the light guide plate 3.
In this embodiment, the backlight module 100 has the advantages of increasing the viewing angle, optimizing the structure, saving the cost and being capable of mass production of the backlight module 1 of the above embodiment; in addition, because the COP core layer 5 has the characteristic of low polarization loss, the brightness can be effectively improved, the display brightness is prevented from being improved by increasing the brightness of the luminous source 2, and the energy consumption and the cost are saved; therefore, the backlight module 10 provided by the present embodiment is beneficial to forming a display device with wide viewing angle, high brightness, low energy consumption and suitable for mass production
Of course, the light source 2 in the backlight module provided in the above embodiments may also be disposed on the side surface of the light guide plate 3, that is, the side-in type backlight module, and other structures are not changed. The light emitted from the light emitting source 2 enters the light guide plate 3 from the side surface of the light guide plate 3 and is uniformly emitted from the light emitting surface of the light guide plate 3.
The embodiment of the present application further provides a display device, where the display device includes the backlight module (including the backlight module 1, the backlight module 10, the backlight module 100, and the backlight module 100') provided in any one of the above embodiments, and a display panel arranged opposite to the backlight module; the backlight module is used for providing light sources for the display panel.
Specifically, the display panel comprises a liquid crystal display panel, and the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer, wherein the array substrate is arranged close to the backlight module, the color film substrate is arranged opposite to the array substrate, and the liquid crystal layer is arranged between the array substrate and the color film substrate.
When the backlight module does not include a COP core layer (a composite film of a prism film and a reflective polarizing brightness enhancement film), the COP core layer may be disposed in the display panel, and the COP core layer may be used in combination with a polarizer on the array substrate side; when the backlight module comprises the COP core layer, the COP core layer is not required to be arranged in the display panel. Specifically, the reflective polarizing brightness enhancement film in the COP core layer is disposed adjacent to the polarizer.
In the embodiment, on one hand, the quantum dots in the quantum dot light conversion layer have the effect of increasing the visual angle, and the scattering particles in the scattering film layer can further increase the visual angle through the light diffusion effect, so that the visual angle reaches about 120 degrees, and meanwhile, the color cast of a large visual angle can be improved; on the other hand, the COP core layer formed by the prism film and the reflection type polarized light brightness enhancement film has the characteristic of low polarization loss, so that the brightness can be effectively improved, the display brightness is prevented from being improved by increasing the brightness of a luminous source, and the energy consumption and the cost are saved; therefore, the display device provided by the embodiment of the application has the advantages of wide viewing angle, high brightness, low energy consumption and the like.
As shown in fig. 5 to 7, an embodiment of the present application further provides a display panel 6, where the display panel 6 includes a light conversion functional layer 4, and a polarizer 7, a display functional layer 8, a prism film 51, a reflective polarization brightness enhancement film 52, and a polarizer film 51, which are sequentially disposed on the light conversion functional layer 4; the light conversion function layer 4 includes a quantum dot light conversion layer 41, and a scattering film layer 42 disposed on at least one side of the quantum dot light conversion layer 41, and is used for enlarging a light emitting angle of the light conversion function layer 4.
Specifically, as shown in fig. 5, the scattering film layer 42 may be disposed on both sides of the quantum dot light conversion layer 41, that is, the scattering film layer 42 is disposed on the side of the quantum dot light conversion layer 41 close to the prism film 51, and the side of the quantum dot light conversion layer 41 far from the prism film 51; as shown in fig. 6, the scattering film layer 42 may also be provided only on the side of the quantum dot light conversion layer 41 close to the prism film 51; as shown in fig. 7, the scattering film layer 42 may also be provided only on the side of the quantum dot light-converting layer 41 away from the prism film 51.
Specifically, the scattering film layer 42 includes a first carrier layer and scattering particles dispersed in the first carrier layer. Wherein, the first carrier is transparent resin organic matter, such as UV (ultraviolet) curing adhesive or pressure-sensitive adhesive; the material of the scattering particles comprises titanium dioxide; the refractive index of the scattering particles is greater than 1.5; the diameter of the scattering particles ranges from 200 to 1000 nanometers, and the mass fraction of the scattering particles in the scattering film layer 42 ranges from 3% to 50%; the thickness of the scattering film layer 42 ranges from 5 to 50 microns.
Specifically, the quantum dot light conversion layer 41 includes a second carrier layer and quantum dots dispersed in the second carrier layer; the quantum dots at least comprise red light quantum dots and green light quantum dots. The second carrier layer is a transparent organic material such as resin, and may be the same as the first carrier layer. The red light quantum dots and the green light quantum dots can respectively emit red light and green light under the excitation of an excitation light source (such as blue light or ultraviolet light). Of course, the quantum dots may also include blue quantum dots, which may emit blue light under excitation of an excitation light source (e.g., ultraviolet light).
Specifically, the quantum dots in the quantum dot light conversion layer 41 include any one of core-shell structure quantum dots, composite quantum dots, and perovskite quantum dots. The quantum dot with the core-shell structure comprises a luminescent core and a protective shell layer, wherein the material of the luminescent core comprises ZnCdSe2、InP、Cd2SSe、CdSe、Cd2SeTe and InAs, and the material of the protective shell layer comprises CdS, ZnSe and ZnCdS2Any one or more of ZnS and ZnO. The composite quantum dot comprises a hydrogel loaded quantum dot structure or CdSe-SiO2. The quantum dots are divided into red light quantum dots, green light quantum dots and blue light quantum dots according to different luminescent colors, the materials of the red light quantum dots, the green light quantum dots and the blue light quantum dots can be the same, and the red light quantum dots, the green light quantum dots and the blue light quantum dots can emit light with different colors only by regulating and controlling the size of the quantum dots. Of course, the materials of the red light quantum dots, the green light quantum dots and the blue light quantum dots may also be different, and are not limited herein.
Specifically, the prism film 51 and the reflection type polarization enhancement film 52 are composite film layers, also referred to as COP core layers 5. The reflective polarizing brightness enhancement film 52 may be replaced by other film layers with reflective brightness enhancement function.
Specifically, the display function layer 8 includes an array substrate, a liquid crystal layer, and a color film substrate sequentially disposed on the polarizer 7; certainly, the display function layer 8 further includes an upper polarizer disposed on any side of the color film substrate, and correspondingly, the polarizer 7 between the reflective polarization brightness enhancement film 52 and the array substrate is a lower polarizer; in one embodiment, the polarization directions of the upper polarizer and the lower polarizer are opposite. Note that, when the color filter layer in the display function layer 8 is provided on the array substrate side, the color filter substrate is to be replaced with a transparent counter substrate.
Specifically, the light conversion functional layer 4, the prism film 51, the reflective polarizing and brightness enhancing film 52, and the polarizer 7 may be combined into an integral film.
In this embodiment, the light conversion functional layer 4, the prism film 51, and the reflection type polarization brightness enhancement film 52 are used in combination with the polarizer 7 on the array substrate side; on one hand, the quantum dots in the quantum dot light conversion layer 41 have the effect of increasing the viewing angle, and the scattering particles in the scattering film layer 42 can further increase the viewing angle through the light diffusion effect, so that the viewing angle reaches about 120 degrees, and meanwhile, the large-viewing-angle color cast can be improved; on the other hand, the COP core layer 5 formed by the prism film 51 and the reflection type polarization brightness enhancement film 52 has the characteristic of low polarization loss, can effectively improve the brightness, avoids improving the display brightness by increasing the brightness of a light emitting source, and is beneficial to saving energy consumption and cost; therefore, the present application provides a new display panel 6 with wide viewing angle, high brightness, and low power consumption, which is suitable for mass production.
The application also provides a display device, which comprises the display panel in the embodiment and a backlight unit arranged opposite to the display panel; the light-emitting side of the backlight unit is disposed adjacent to the light conversion functional layer.
Specifically, the backlight unit includes a light emitting source and a light guide plate; the backlight source is arranged on one side of the light guide plate, which is far away from the light conversion functional layer, namely the direct type; or the light guide plate is arranged on the side surface of the light guide plate, namely, the side entrance type light guide plate is arranged. Taking the direct type backlight unit as an example, the light source includes a blue light source; the specific structure of the blue light source comprises a back plate and a plurality of LED light-emitting units which are arranged on one side of the back plate close to the light guide plate and distributed in an array manner, and the LED light-emitting units are used for emitting blue light; of course, the LED lighting unit may be replaced by a Mini-LED lighting unit; correspondingly, the quantum dot light conversion layer comprises red light quantum dots and green light quantum dots which are dispersed in the second carrier layer; the red light quantum dots and the green light quantum dots respectively emit red light and green light under the excitation of the blue light, and the excited red light and green light are mixed with the blue light emitted by the blue light source to form white light which is used as a backlight source of the display panel. Of course, the light emitting source may also be an ultraviolet light source for emitting ultraviolet light; correspondingly, the quantum dot light conversion layer comprises red light quantum dots, green light quantum dots and blue light quantum dots which are dispersed in the second carrier layer; the red light quantum dots, the green light quantum dots and the blue light quantum dots respectively emit red light, green light and blue light under the excitation of ultraviolet light, and the excited red light, green light and blue light are mixed into white light.
It should be noted that, when the light emitting source is an ultraviolet light source, in order to avoid the damage of the redundant ultraviolet light to the eyes of the user, a filter film may be further disposed on the light emitting side of the light conversion functional layer to filter the unconverted ultraviolet light.
In the embodiment, on one hand, the quantum dots in the quantum dot light conversion layer have the effect of increasing the visual angle, and the scattering particles in the scattering film layer can further increase the visual angle through the light diffusion effect, so that the visual angle reaches about 120 degrees, and meanwhile, the color cast of a large visual angle can be improved; on the other hand, the COP core layer formed by the prism film and the reflection type polarized light brightness enhancement film has the characteristic of low polarization loss, so that the brightness can be effectively improved, the display brightness is prevented from being improved by increasing the brightness of a luminous source, and the energy consumption and the cost are saved; therefore, the display device provided by the embodiment of the application has the advantages of wide viewing angle, high brightness, low energy consumption and the like.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The backlight module and the display panel provided by the embodiment of the present application are described in detail above, and a specific example is applied to illustrate the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. The backlight module is characterized by comprising a light guide plate and a light conversion functional layer positioned on the light emergent side of the light guide plate; the light conversion function layer comprises a quantum dot light conversion layer and a scattering film layer arranged on at least one side of the quantum dot light conversion layer and used for enlarging the light outlet angle of the light conversion function layer.
2. The backlight module according to claim 1, further comprising a prism film and a reflection type polarization brightness enhancement film sequentially disposed on a side of the light conversion function layer away from the light guide plate.
3. The backlight module of claim 1, wherein the scattering film layer comprises a first carrier layer and scattering particles dispersed in the first carrier layer.
4. The backlight module of claim 3, wherein the material of the scattering particles comprises titanium dioxide; the refractive index of the scattering particles is greater than 1.5; the scattering particles have a diameter in the range of 200 to 1000 nanometers.
5. The backlight module of claim 3, wherein the scattering particles are present in the scattering film layer in a mass fraction ranging from 3% to 50%; the thickness of the scattering film layer ranges from 5 to 50 microns.
6. A display panel is characterized by comprising a light conversion functional layer, and a polaroid and a display functional layer which are sequentially arranged on the light conversion functional layer; the light conversion function layer comprises a quantum dot light conversion layer and a scattering film layer arranged on at least one side of the quantum dot light conversion layer and used for enlarging the light outlet angle of the light conversion function layer.
7. The display panel according to claim 6, further comprising a prism film between the light conversion functional layer and the polarizer, and a reflective polarizing brightness enhancement film between the prism film and the polarizer.
8. The display panel of claim 6, wherein the scattering film layer comprises a first carrier layer and scattering particles dispersed in the first carrier layer.
9. The display panel of claim 8, wherein the material of the scattering particles comprises titanium dioxide; the refractive index of the scattering particles is greater than 1.5; the scattering particles have a diameter in the range of 200 to 1000 nanometers.
10. The display panel of claim 8, wherein the scattering particles are present in the scattering film layer in a mass fraction ranging from 3% to 50%; the thickness of the scattering film layer ranges from 5 to 50 microns.
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Application publication date: 20200605 |