CN116538466A - Lighting panel and car lamp - Google Patents

Lighting panel and car lamp Download PDF

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Publication number
CN116538466A
CN116538466A CN202310552240.1A CN202310552240A CN116538466A CN 116538466 A CN116538466 A CN 116538466A CN 202310552240 A CN202310552240 A CN 202310552240A CN 116538466 A CN116538466 A CN 116538466A
Authority
CN
China
Prior art keywords
light
functional layer
layer
lighting panel
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310552240.1A
Other languages
Chinese (zh)
Inventor
刘广超
高栋雨
陈立
孙震
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
Beijing BOE Technology Development Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
Beijing BOE Technology Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd, Chengdu BOE Optoelectronics Technology Co Ltd, Beijing BOE Technology Development Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202310552240.1A priority Critical patent/CN116538466A/en
Publication of CN116538466A publication Critical patent/CN116538466A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F21S43/145—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/255—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The present disclosure relates to an illumination panel and a vehicle lamp. The illumination panel comprises a light-emitting substrate, a first functional layer, a second functional layer and a cover plate. The light-emitting substrate comprises a plurality of light-emitting devices, the first functional layer is arranged on one side of the light-emitting substrate, the second functional layer is arranged on one side of the first functional layer, which is away from the light-emitting substrate, and the refractive index of the second functional layer is higher than that of the first functional layer and the refractive index of the second functional layer is also higher than that of the cover plate. The lighting panel and the car lamp can delay the service life attenuation speed of the lighting panel and the car lamp to a certain extent.

Description

Lighting panel and car lamp
Technical Field
The disclosure relates to the technical field of illumination, in particular to an illumination panel and a car lamp.
Background
The organic electroluminescent device has the advantages of self-luminescence, wide viewing angle, high contrast, light weight, thin weight and the like, so that the organic electroluminescent device has wide market prospect as a lighting device. For example, the organic electroluminescent device is applied to the field of automobile lamps and has good display effect. However, in use, the vehicle lamp is exposed to outdoor sunlight for a long time, and high-energy sunlight is incident to the organic electroluminescent device, so that the service life of the organic material is easily reduced and the organic material is easily disabled.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The purpose of the present disclosure is to provide an illumination panel and a vehicle lamp, which can delay the life decay speed of the illumination panel and the vehicle lamp to a certain extent.
According to one aspect of the present disclosure, there is provided an illumination panel comprising:
a light emitting substrate including a plurality of light emitting devices;
the first functional layer is arranged on one side of the light-emitting substrate;
the second functional layer is arranged on one side, away from the light-emitting substrate, of the first functional layer, and the refractive index of the second functional layer is higher than that of the first functional layer;
and the refractive index of the cover plate is lower than that of the second functional layer.
In one exemplary embodiment of the present disclosure, the first functional layer is configured to transmit light of a first color, including light emitted by the light emitting device, and reflect light of a second color.
In an exemplary embodiment of the present disclosure, the first functional layer includes a plurality of color filters distributed in an array, at least a portion of an orthographic projection of one color filter on the light emitting substrate overlaps the light emitting device, and the color filter is configured to transmit light of a first color and reflect light of a second color.
In one exemplary embodiment of the present disclosure, the lighting panel further includes:
an absorption layer including a plurality of light absorption portions and a light shielding portion separating the light absorption portions;
the absorption layer is arranged on one side of the first functional layer, which is close to the light-emitting substrate, and is provided with a plurality of light holes penetrating through the absorption layer along the direction perpendicular to the cover plate, and the light absorption parts are correspondingly filled in the light holes one by one;
the boundary of orthographic projection of the light-transmitting hole on the light-emitting substrate is positioned in the boundary of the light-emitting device, and the light-absorbing part can absorb ultraviolet light emitted into the light-absorbing part.
In one exemplary embodiment of the present disclosure,
the light absorbing part comprises an ultraviolet light absorber; or alternatively, the first and second heat exchangers may be,
the light absorption part comprises color conversion quantum dots, the color conversion quantum dots can absorb ultraviolet light after being excited by the ultraviolet light and emit light of a third color, and the light of the third color comprises light emitted by the light emitting device.
In an exemplary embodiment of the present disclosure, the light-transmitting hole is shrunk from an end facing away from the light-emitting substrate to an end near the light-emitting substrate, and a boundary of the light-transmitting hole is a boundary of an end of the light-transmitting hole facing away from the light-emitting substrate.
In one exemplary embodiment of the present disclosure,
the shape of the cross section of the light hole along the direction perpendicular to the cover plate is a trapezoid shrinking towards the light-emitting substrate, and the included angle between the waist of the trapezoid and the surface of the light shielding part deviating from the light-emitting substrate is 100-150 degrees.
In one exemplary embodiment of the present disclosure,
the distance between the boundary of the orthographic projection of the light-transmitting hole on the light-emitting substrate and the boundary of the light-emitting device is 0.88 to 1.056 micrometers.
In an exemplary embodiment of the present disclosure, the inner wall of the light transmitting hole is provided with a reflective layer.
According to one aspect of the present disclosure, there is provided a vehicle lamp comprising:
a circuit board;
the lighting panel of any one of the above, wherein the lighting panel is connected to the circuit board in a binding manner;
the shell is covered on the light-emitting side of the illumination panel.
According to the lighting panel and the vehicle lamp, the refractive index of the second functional layer is higher than that of the first functional layer and the cover plate, so that when the light rays of the external environment are incident on the lighting panel from the surface of the cover plate through adjusting the thickness of the second functional layer, the light reflected on the junction surface of the cover plate and the second functional layer and the light reflected on the junction surface of the first functional layer and the second functional layer interfere and strengthen, the reflectivity of the ambient light is enhanced, the ambient light emitted into the light-emitting substrate is reduced, the damage of the ambient light to the light-emitting device is avoided, and the service life attenuation speed of the lighting panel and the vehicle lamp is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic view of a light emitting substrate in an embodiment of a lighting panel of the present disclosure.
Fig. 2 is a schematic diagram of an embodiment of a lighting panel of the present disclosure.
Fig. 3 is a schematic view of an absorber layer in an embodiment of a lighting panel of the present disclosure.
Fig. 4 is a schematic diagram of a light emitting functional layer in an embodiment of the lighting panel of the present disclosure.
Fig. 5 is a schematic diagram of a light shielding portion and a light absorbing portion in an embodiment of an illumination panel of the disclosure.
Fig. 6 is a schematic diagram of an illumination panel and a circuit board according to an embodiment of the illumination panel of the present disclosure.
Fig. 7 is a schematic diagram of an illumination panel and a circuit board according to an embodiment of the illumination panel of the present disclosure.
Reference numerals illustrate:
1. a first functional layer; 2. a second functional layer; 21. a plano-convex lens; 22. a flat layer; 3. a cover plate; 4. a light emitting layer; 40. a light emitting device; 41. a first electrode, 42, a light-emitting functional layer, 43, a second electrode; 44. a pixel definition layer; 441. a pixel opening; 45. a first light emitting functional sub-layer; 451. a first hole transport layer; 452. a first luminescent material sub-layer; 453. a first electron transport layer; 46. a second light-emitting functional sub-layer; 461. a second hole transport layer; 462. a second luminescent material sub-layer; 463. a second electron transport layer;
5, a step of; a driving circuit layer; 6. an encapsulation layer; 60. frame glue; 7. an absorption layer; 71. a light shielding section; 72. a light absorption portion; 73. a reflective layer; 100. a circuit board.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.
According to one aspect of the present disclosure, a lighting panel is provided. Referring to fig. 1 to 2, the illumination panel may include a light emitting substrate, a first functional layer 1, a second functional layer 2, and a cover plate 3. The cover plate 3 may be made of transparent materials such as acryl or glass, the light-emitting substrate includes a plurality of light-emitting devices 40, and the light-emitting devices 40 are organic electroluminescent devices 40. The first functional layer 1 is arranged on one side of the light-emitting substrate, the second functional layer 2 is arranged on one side of the first functional layer 1, which is away from the light-emitting substrate, and the refractive index of the second functional layer 2 is higher than that of the first functional layer 1, and the refractive index of the second functional layer 2 is also higher than that of the cover plate 3.
In the lighting panel of the embodiment of the disclosure, the first functional layer 1, the second functional layer 2 and the cover plate 3 are sequentially and adjacently arranged on the light emitting side of the light emitting substrate, and when the light of the external environment enters the lighting panel from the surface of the cover plate 3, the light reflected at the interface surface of the cover plate 3 and the second functional layer 2 and the light reflected at the interface surface of the first functional layer 1 and the second functional layer 2 are coherent light; and the refractive index of the second functional layer 2 is higher than that of the first functional layer 1 and the cover plate 3, so that the optical path difference of the two reflected light beams can be adjusted by adjusting the thickness of the second functional layer 2, and interference enhancement is realized on the reflected light beams with specific wavelengths, thereby enhancing the reflectivity of the ambient light, reducing the ambient light injected into the light-emitting substrate, avoiding the damage of the ambient light to the light-emitting device 40, and delaying the service life attenuation speed of the lighting panel and the car lamp.
The following describes the parts of the lighting panel in detail:
the light-emitting substrate may include a driving back plate and a light-emitting layer 4 disposed at one side of the driving back plate. The driving backboard comprises a substrate and a driving circuit layer 5, the substrate is of a flat plate structure, and can be made of flexible materials such as polyimide PI materials or glass; the driving circuit layer 5 is disposed on one side of the substrate, and is used for driving the light-emitting layer 4 to emit light. The light-emitting layer 4 is arranged on one side of the driving circuit layer 5, which is away from the substrate, the first functional layer 1 is arranged on one side of the light-emitting layer 4, which is away from the driving backboard, and the cover plate 3 is parallel to the substrate. The light emitting layer 4 may include a plurality of light emitting devices 40 distributed in an array, and each light emitting device 40 may include a first electrode 41, a light emitting functional layer 42, and a second electrode 43 sequentially stacked in a direction away from the driving back plate. The term "orthographic projection onto the light-emitting substrate" in the present disclosure is understood to mean orthographic projection onto the substrate, i.e. onto the cover plate 3.
In one embodiment of the present disclosure, referring to fig. 1, the driving circuit layer 5 may be provided at a side of the first electrode 41 near the cap plate 3. For example, the first electrode 41 is an anode, the second electrode 43 is a cathode, and the light emitting functional layer 42 may include a hole injecting layer, a hole transporting layer, a light emitting material layer, an electron transporting layer, and an electron injecting layer, which are sequentially stacked in a direction away from the cap plate 3.
The illumination panel may be divided into at least an illumination area and a peripheral area outside the illumination area, and correspondingly, the driving circuit layer 5 may also include a pixel circuit inside the illumination area and a pixel circuit in the peripheral area, wherein the peripheral circuit is connected to the pixel circuit for inputting a driving signal to the pixel circuit, and the pixel circuit is used for driving the light emitting device 40 to emit light. The second electrode 43 may extend to the peripheral area and be connected to the power signal terminal for receiving a power signal. When the illumination panel is operated, a data signal may be applied to the first electrode 41 through the pixel circuit and a power signal may be applied to the second electrode 43 through the power signal terminal, so that electrons and holes are recombined at the light emitting material layer, thereby emitting light at the light emitting functional layer 42. The number of the pixel circuits is the same as the number of the light emitting devices 40, and is connected to each light emitting device 40 in a one-to-one correspondence for controlling the light emission of each light emitting device 40, respectively, so that the illumination panel can realize patterned display.
The light emitting device 40 includes, but is not limited to, a blue light emitting device 40 for emitting blue light, a red light emitting device 40 for emitting red light, a green light emitting device 40 for emitting green light, and the like. In one embodiment of the present disclosure, the luminescent material of the luminescent material layer may be one or more of a red fluorescent material, a red phosphorescent material, a red thermally activated delayed fluorescent material, a red quantum dot material. For example, the luminescent material of the luminescent material layer may be a red phosphorescent material, which has a longer lifetime and a higher internal quantum efficiency, and in particular, the luminescent material may be one or more of red iridium complexes btp2Ir (acac), ir (piq) 3, ir (tiq) 3, ir (fliq) 3.
In an illumination panel of one embodiment of the present disclosure, the first electrode 41 is made of an indium tin oxide transparent conductive film, and the second electrode 43 is made of an opaque metal material such as Mg: ag. The light emitted by the light emitting functional layer 42 is emitted from the transparent first electrode 41, the refractive index of the first electrode 41 is slightly larger than that of the organic material, the microcavity effect between the first electrode 41 and the second electrode 43 is very weak, and the influence on the spatial light emitting intensity distribution of the light emitted by the light emitting functional layer 42 is very low, so that serious brightness attenuation cannot occur under various observation angles, and the uniform light emission of the illumination panel under a large viewing angle is facilitated.
In another embodiment of the present disclosure, the driving circuit layer 5 may also be disposed on a side of the second electrode 43 facing away from the cover plate 3. For example, the first electrode 41 is a cathode, the second electrode 43 is an anode, and the light emitting functional layer 42 may include an electron injection layer, an electron transport layer, a light emitting material layer, a hole transport layer, and a hole injection layer, which are sequentially stacked in a direction away from the cap plate 3. The first electrode 41 may be made of an indium tin oxide transparent conductive film, or made of a metal such as Ca/Ag; the second electrode 43 may be made of an opaque metal material, and light emitted from the light emitting functional layer 42 is emitted from the first electrode 41.
In one embodiment of the present disclosure, the light emitting layer 4 further includes a pixel defining layer 44 for defining the range of each light emitting device 40. Taking the driving circuit layer 5 disposed on the side of the first electrode 41 near the cover plate 3 as an example, the pixel defining layer 44 is provided with a plurality of pixel openings 441, and the pixel openings 441 expose the first electrodes 41 of the light emitting devices 40 in a one-to-one correspondence. In some embodiments, the light emitting function layer 42 is laminated on the region of the first electrode 41 within the pixel opening 441. The light emitting functional layers 42 of each light emitting device 40 are spaced apart independently from each other. The light emitting color of the different light emitting functional layers 42 may be different according to the light emitting material. The second electrode 43 may cover the light emitting function layer 42 such that the respective light emitting devices 40 may share the same second electrode 43. Each light emitting device 40 may be defined by the plurality of pixel openings 441 described above, and in the description of this disclosure, the boundary of any light emitting device 40 is the boundary of the light emitting functional layer 42 within its corresponding pixel opening 441.
In another embodiment of the present disclosure, the light emitting functional layer 42 of each light emitting device 40 may also belong to the same continuous light emitting film layer covering both the respective first electrode 41 and the surface of the pixel defining layer 44 facing away from the cover plate 3. The region of the light emitting film layer in the pixel opening 441 and stacked on the first electrode 41 is the light emitting functional layer 42 corresponding to the light emitting device 40, and the two adjacent light emitting functional layers 42 are connected through other regions of the light emitting film layer. That is, the light emitting devices 40 may share the same light emitting film layer, and the different light emitting functional layers 42 may emit the same color. For example, the light emitting device 40 may emit red light in each of the light emitting functional layers 42.
In some embodiments of the present disclosure, referring to fig. 4, each light emitting device 40 includes a first electrode 41, a second electrode 43, and a plurality of light emitting functional sublayers between the first electrode 41 and the second electrode 43, the same light emitting device 40 may share the same first electrode 41 and the same second electrode 43, i.e., the same light emitting unit may have only one first electrode 41 and one second electrode 43. For example, the light emitting functional layer 42 includes a first light emitting functional sub-layer 45 and a second light emitting functional sub-layer 46 sequentially connected in series in a direction away from the cover plate 3, and the first light emitting functional sub-layer 45 may include a first hole transporting layer 451, a first light emitting material sub-layer 452, and a first electron transporting layer 453 sequentially distributed in a direction away from the cover plate 3; the second light emitting functional sub-layer 46 may include a second hole transporting layer 461, a second light emitting material sub-layer 462, and a second electron transporting layer 463 sequentially distributed in a direction away from the cap plate 3. In other embodiments, each light emitting device 40 may also include more light emitting functional sublayers, and adjacent light emitting functional sublayers may share one or more of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. The specific number of the light emitting functional sub-layers is not particularly limited herein. The luminescent materials of the luminescent material sublayers may be the same or different.
Referring to fig. 1, the lighting substrate may further include an encapsulation layer 6, where the encapsulation layer 6 may cover each light emitting device 40, and is used to protect the light emitting layer 4 and prevent the light emitting device 40 from being corroded by external water and oxygen. Taking the driving circuit layer 5 disposed on the side of the first electrode 41 near the cover plate 3 as an example, the encapsulation layer 6 may be encapsulated by a thin film encapsulation manner, or encapsulated by a frame glue 60, and the encapsulation layer 6 may cover the second electrode 43 on the side of the light emitting layer 4 facing away from the cover plate 3.
In one embodiment of the present disclosure, the cover plate 3 is made of glass, and the refractive index n1 of the second functional layer 2 is 1.6 to 2.0. Referring to fig. 1 to 4, the second functional layer 2 may include a lens array provided at one side of the cover plate 3 near the light emitting layer 4 and including a plurality of plano-convex lenses 21 protruding toward a direction away from the cover plate 3; the second functional layer 2 further comprises a planar layer 22 covering the side of the lens array facing away from the cover plate 3. The lens array can improve the light extraction efficiency of the illumination panel. For the illumination panel shown in fig. 1, the plano-convex lenses 21 of the lens array are all arranged in a manner that the plane is close to the cover plate 3, the curved surface is close to the light-emitting layer 4, and the direction of the light emitted by the illumination panel is inverted, so that the structure can directly arrange the lens array on the cover plate 3, then form the flat layer 22, and then form the first functional layer 1 on the surface of the flat layer 22, thereby being beneficial to simplifying the manufacturing process. In other embodiments of the present disclosure, it is understood that the planar convex lens 21 may be disposed such that the curved surface thereof is close to the cover plate 3 and the flat surface thereof is close to the light emitting layer 4.
The refractive index of the first functional layer 1 is lower than that of the second functional layer 2, and in one embodiment of the present disclosure, the refractive index of the first functional layer 1 may be 1.2 to 1.6. In order to enhance interference between the light reflected by the interface surface of the cover plate 3 and the second functional layer 2 and the light reflected by the interface surface of the first functional layer 1 and the second functional layer 2, the thickness d1=λ/(4×n1) of the second functional layer 2, i.e. the thickness of the second functional layer 2 is a quarter of the wavelength of the reflected light. In one embodiment, d1 has a value ranging from 10nm to 120nm, and in particular, d1 may have a value ranging from 25nm to 60nm, and may reflect light rays in the ultraviolet light band from ultraviolet light having relatively high energy in sunlight. For example, if the thickness d1 of the second functional layer 2 is 47nm, the refractive index n1 of the second functional layer 2 is 1.8, and the refractive index n2 of the first functional layer 1 is 1.5, the interference of ultraviolet light having a wavelength of 338.4nm on both side surfaces of the second functional layer 2 is enhanced, and ultraviolet light having a short wavelength entering the illumination panel can be reduced.
In one embodiment of the present disclosure, the first functional layer 1 is filled with scattering particles, which may be oxide particles, nitride particles, or the like, and the scattering ability of the first functional layer 1 may be improved, the maximum light-emitting angle may be increased, the light emitted from the light-emitting layer 4 may be more dispersed, and the brightness difference of different viewing angles may be reduced. Specifically, the scattering particles can be titanium oxide or silicon oxide particles, have excellent scattering characteristics, and have stable performance.
In one embodiment of the present disclosure, the lighting panel further comprises an absorption layer 7, the absorption layer 7 being provided on a side of the first functional layer 1 adjacent to the light emitting layer 4. Referring to fig. 1, the absorbing layer 7 includes a plurality of light-transmitting holes penetrating the absorbing layer 7 in a direction perpendicular to the cover plate 3, and light-shielding portions 71 between the light-transmitting holes. The light-absorbing portions 72 are filled in each light-transmitting hole corresponding to the light-emitting device 40 in a direction perpendicular to the cover plate 3, and the light-absorbing portions 72 are capable of absorbing ultraviolet light incident into the light-absorbing portions 72 and transmitting light emitted from the light-emitting device 40. The light shielding portion 71 may be a black material for absorbing light incident on the light shielding portion 71 and also for absorbing light incident on the light shielding portion 71 by the light emitting layer 4.
The light absorbing portion 72 may include an ultraviolet absorber, for example, the light absorbing portion 72 is entirely made of polyimide, polyethylene terephthalate, silicon oxide, or silicon nitride, and is doped with one or more of salicylate-based, benzophenone-based, benzotriazole-based, substituted acrylonitrile-based, triazine-based, and hindered amine-based ultraviolet absorbers. In one embodiment, the light absorbing portion 72 is comprised of silicon oxide and silicon nitride as the host material and is doped with 0.5% benzotriazole.
In another embodiment of the present disclosure, the light absorbing portion 72 may include color conversion quantum dots capable of absorbing ultraviolet light and emitting light of a specific wavelength after being excited by the ultraviolet light. Preferably, color conversion quantum dots that emit light corresponding to the light emitted from the light emitting device 40 after being excited by ultraviolet light may be used, so that the light absorbing portion 72 may enhance the brightness of the illumination panel while having an ultraviolet light absorbing function. In addition, the color conversion quantum dots are closer to the cover plate 3 than the light emitting device 40, and the color conversion quantum dots emit light in all directions after being excited, so that the uniformity of the light emitted from the illumination panel can be improved.
In one embodiment of the present disclosure, the boundary of the orthographic projection of the light hole on the cover plate 3 is located within the boundary of the orthographic projection of the light emitting device 40 on the cover plate 3, that is, the light shielding portion 71 shields the pixel defining layer 44 on the side of the pixel defining layer 44 close to the cover plate 3, so that the ambient light can be prevented from irradiating the pixel defining layer 44 to cause the air leakage of the pixel defining layer 44, and the edge of the pixel opening 441 is shrunk, so that the service life of the light emitting layer 4 is shortened or even disabled. Further, in one embodiment, the light hole is shrunk from one end facing away from the cover plate 3 to one end close to the cover plate 3, and the boundary between the side of the light hole close to the cover plate 3 and the orthographic projection of the side facing away from the cover plate 3 on the cover plate 3 is located within the boundary of the orthographic projection of the light emitting device 40 on the cover plate 3.
For example, referring to fig. 3 to 5, the shape of the light-transmitting hole in a cross section in a direction perpendicular to the cover plate 3 is a trapezoid that is shrunk toward the cover plate 3. In the cross-section of the illumination panel, the boundary of the front projection of the side of the light-absorbing portion 72 facing away from the cover plate 3 on the cover plate 3 coincides with the boundary of the front projection of the light-emitting device 40 on the cover plate 3, and the boundary of the front projection of the side of the light-absorbing portion 72 facing towards the cover plate 3 on the cover plate 3 is located within the boundary of the front projection of the light-emitting device 40 on the cover plate 3, with a distance b. In one embodiment of the present disclosure, the value of b ranges from 0.176 μm to 1.76 μm, and the angle α between the trapezoid waist of the cross section of the light-transmitting hole perpendicular to the cover plate 3 and the surface of the light-shielding portion 71 facing away from the cover plate 3 is from 100 ° to 150 °. In one embodiment, α is 100 ° to 150 °, and b is in the range of 0.88 μm to 1.056 μm, and the thickness of the corresponding absorption layer 7 is 0.5 μm to 6 μm, so that the light-shielding effect of the light-shielding portion 71 on the pixel defining layer 44 is ensured without affecting the light-emitting device 40 to emit light to the outside of the illumination panel. The interval c between the light emitting devices 40 of the light emitting layer 4 may have a value ranging from 18 μm to 25 μm, and in order to optimize the matching effect with the light absorbing portion 72, it is preferable that the interval c between the light emitting devices 40 has a value ranging from 19 μm to 22 μm.
In one embodiment of the present disclosure, referring to fig. 5, the inner wall of the light-transmitting opening is provided with a reflective layer 73 to prevent light emitted from the light-emitting device 40 from being absorbed by the light-shielding portion 71 when it is irradiated to the inner wall of the light-transmitting opening, so that the light-emitting efficiency of the illumination panel can be improved.
It should be noted that, due to the upper limit of the precision of the manufacturing process, the actual shape of the cross section of the light-transmitting hole along the direction perpendicular to the cover plate 3 may not be a trapezoid without any error, for example, the waist of the trapezoid may be a curve or a broken line. The shape should be regarded as trapezoid as long as it is within an error allowed by the manufacturing accuracy. Thus, it can be further explained that the concepts of plane, vertical, etc. mentioned in this disclosure are within the allowable range of manufacturing process accuracy.
In other embodiments, the shape of the cross section of the light hole along the direction perpendicular to the cover plate 3 may be other than trapezoid, for example, rectangular or other shape.
In one embodiment of the present disclosure, the first functional layer 1 may include a color filter. At least part of the projection of the color filter portion on the cover plate 3 overlaps the light emitting device 40, and the color filter portion may be used to transmit light of a specific wavelength band. The color filter portion may transmit light corresponding to light emitted from the light emitting device 40, for example, the light emitting device 40 is configured to emit red light, and the color filter portion is configured to transmit red light and reflect other non-red light.
In one embodiment, the second functional layer 2 may include a color filter portion corresponding to the light absorbing portion 72 and the light emitting device 40 in a direction perpendicular to the cover plate 3 and a scattering portion other than the color filter portion, and a boundary of the orthographic projection of the light emitting device 40 on the cover plate 3 is within a boundary of the orthographic projection of the color filter portion on the cover plate 3. The scattering portion may be filled with the transparent scattering particles. In another embodiment, the second functional layer 2 as a whole may be configured to transmit light of a specific wavelength band, for example, the light emitting device 40 is configured to emit red light, and the second functional layer 2 as a whole is configured to transmit red light and reflect other non-red light rays.
According to another aspect of the present disclosure, there is provided a vehicle lamp, as shown with reference to fig. 6 to 7, including a circuit board 100, an illumination panel of any one of the above, and a housing. The illumination panel is bound and connected to the circuit board 100, and the housing covers the light emitting side of the illumination panel. The specific structure and advantages of the lighting panel have been described in detail in the embodiments of the lighting panel above, and will not be described in detail herein; the whole lighting panel can be diamond, triangle, rectangle or other shapes, and the shell can be transparent or red or other colors. The car lamp can be a car tail lamp, other warning lamps, decorative lamps and the like, and can also be used as an indicator lamp and the like on facilities such as traffic sentry boxes and the like.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A lighting panel, comprising:
a light emitting substrate including a plurality of light emitting devices;
the first functional layer is arranged on one side of the light-emitting substrate;
the second functional layer is arranged on one side, away from the light-emitting substrate, of the first functional layer, and the refractive index of the second functional layer is higher than that of the first functional layer;
and the refractive index of the cover plate is lower than that of the second functional layer.
2. A lighting panel as recited in claim 1, wherein said first functional layer is configured to transmit light of a first color and reflect light of a second color, said light of said first color comprising light emitted by said light emitting device.
3. A lighting panel as recited in claim 2, wherein said first functional layer comprises a plurality of color filter portions distributed in an array, at least a portion of a front projection of a color filter portion onto said light-emitting substrate overlapping said light-emitting device, said color filter portion being configured to transmit light of a first color and reflect light of a second color.
4. A lighting panel as recited in any one of claims 1-3, wherein the lighting panel further comprises:
an absorption layer including a plurality of light absorption portions and a light shielding portion separating the light absorption portions;
the light absorption parts are filled in the light holes in a one-to-one correspondence manner;
the boundary of orthographic projection of the light-transmitting hole on the light-emitting substrate is positioned in the boundary of the light-emitting device, and the light-absorbing part can absorb ultraviolet light which is injected into the light-absorbing part.
5. A lighting panel as recited in claim 4, wherein,
the light absorbing part comprises an ultraviolet light absorber; or alternatively, the first and second heat exchangers may be,
the light absorption part comprises color conversion quantum dots, the color conversion quantum dots can absorb ultraviolet light after being excited by the ultraviolet light and emit light of a third color, and the light of the third color comprises light emitted by the light emitting device.
6. A lighting panel as recited in claim 4, wherein said light-transmitting aperture is constricted from an end facing away from said light-emitting substrate to an end adjacent to said light-emitting substrate, and wherein a boundary of said light-transmitting aperture is a boundary of an end of said light-transmitting aperture facing away from said light-emitting substrate.
7. A lighting panel as recited in claim 6, wherein,
the shape of the cross section of the light hole along the direction perpendicular to the cover plate is a trapezoid shrinking towards the light-emitting substrate, and the included angle between the waist of the trapezoid and the surface of the light shielding part deviating from the light-emitting substrate is 100-150 degrees.
8. A lighting panel as recited in claim 7, wherein,
the distance between the orthographic projection boundary of the light-transmitting hole on the light-emitting substrate and the boundary of the light-emitting device is 0.88 to 1.056 micrometers.
9. The lighting panel of claim 8, wherein the inner wall of the light-transmitting aperture is provided with a reflective layer.
10. A vehicle lamp, comprising:
a circuit board;
the lighting panel of any one of claims 1 to 9, which is tie-connected to the circuit board;
and the shell is covered on the light emitting side of the illumination panel.
CN202310552240.1A 2023-05-16 2023-05-16 Lighting panel and car lamp Pending CN116538466A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310552240.1A CN116538466A (en) 2023-05-16 2023-05-16 Lighting panel and car lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310552240.1A CN116538466A (en) 2023-05-16 2023-05-16 Lighting panel and car lamp

Publications (1)

Publication Number Publication Date
CN116538466A true CN116538466A (en) 2023-08-04

Family

ID=87450375

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310552240.1A Pending CN116538466A (en) 2023-05-16 2023-05-16 Lighting panel and car lamp

Country Status (1)

Country Link
CN (1) CN116538466A (en)

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