Lighting panel and vehicle light

Abstract

The present disclosure relates to a lighting panel and a vehicle lamp. The lighting 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 the side of the first functional layer away from the light-emitting substrate. 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 vehicle lamp of the present disclosure can slow down the life attenuation rate of the lighting panel and the vehicle lamp to a certain extent.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of lighting, and in particular, to a lighting panel and a vehicle lamp. BACKGROUND

[0002] Organic electroluminescent devices have the advantages of self-illumination, wide viewing angle, high contrast, thinness, etc., and thus have a broad market prospect as lighting devices. For example, organic electroluminescent devices are applied to the field of vehicle lamps, and have good display effects. However, in use, vehicle lamps are exposed to sunlight for a long time, and high-energy sunlight is incident to the organic electroluminescent devices, which can easily cause the organic materials to attenuate and fail.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and thus can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] The purpose of the present disclosure is to provide a lighting panel and a vehicle lamp, which can slow down the attenuation rate of the lighting panel and the vehicle lamp to a certain extent.

[0005] According to one aspect of the present disclosure, a lighting panel is provided, comprising:

[0006] A light-emitting substrate comprising a plurality of light-emitting devices;

[0007] A first functional layer disposed on one side of the light-emitting substrate;

[0008] A second functional layer disposed on the side of the first functional layer away from the light-emitting substrate, the refractive index of the second functional layer being higher than that of the first functional layer;

[0009] A cover plate, the refractive index of the cover plate being lower than that of the second functional layer.

[0010] In an exemplary embodiment of the present disclosure, the first functional layer is configured to transmit light of a first color and reflect light of a second color, the light of the first color including light emitted by the light-emitting devices.

[0011] In an exemplary embodiment of the present disclosure, the first functional layer comprises a plurality of arrayed color filters, at least part of the orthographic projection of a color filter on the light-emitting substrate overlaps with the light-emitting devices, and the color filter is configured to transmit light of a first color and reflect light of a second color.

[0012] In an exemplary embodiment of the present disclosure, the lighting panel further comprises:

[0013] An absorption layer comprising a plurality of light-absorbing portions and light-shielding portions separating the light-absorbing portions;

[0014] The absorbing layer is arranged on the side of the first functional layer close to the light-emitting substrate, and the absorbing layer is provided with a plurality of light-transmitting holes penetrating the absorbing layer in a direction perpendicular to the cover plate, and the light-absorbing portions are correspondingly filled in the light-transmitting holes.

[0015] The boundary of the orthographic projection of the light-transmitting hole on the light-emitting substrate is located within the boundary of the light-emitting device, and the light-absorbing portion can absorb the ultraviolet light entering the light-absorbing portion.

[0016] In an exemplary embodiment of the present disclosure,

[0017] The light-absorbing portion comprises an ultraviolet light absorber; or,

[0018] The light-absorbing portion comprises color conversion quantum dots, which can absorb ultraviolet light and emit light of a third color after being excited by ultraviolet light, and the light of the third color comprises the light emitted by the light-emitting device.

[0019] In an exemplary embodiment of the present disclosure, the light-transmitting hole is tapered from the end away from the light-emitting substrate to the end close to the light-emitting substrate, and the boundary of the light-transmitting hole is the boundary of the end of the light-transmitting hole away from the light-emitting substrate.

[0020] In an exemplary embodiment of the present disclosure,

[0021] The cross-sectional shape of the light-transmitting hole in the direction perpendicular to the cover plate is a trapezoid tapering toward the light-emitting substrate, and the included angle between the waist of the trapezoid and the surface of the light-blocking portion away from the light-emitting substrate is 100°-150°.

[0022] In an exemplary embodiment of the present disclosure,

[0023] 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 0.88-1.056 microns.

[0024] In an exemplary embodiment of the present disclosure, the inner wall of the light-transmitting hole is provided with a reflective layer.

[0025] According to one aspect of the present disclosure, a vehicle lamp is provided, comprising:

[0026] A circuit board;

[0027] The lighting panel of any one of the above, the lighting panel is bound to the circuit board;

[0028] A housing, a cover is arranged on the light-emitting side of the lighting panel.

[0029] The illumination panel and the vehicle lamp of the present disclosure, the refractive index of the second functional layer is higher than that of the first functional layer and the cover plate, so by adjusting the thickness of the second functional layer, the light from the outside environment can be enhanced by the interference of the light reflected on the interface surface between the cover plate and the second functional layer and the light reflected on the interface surface between the first functional layer and the second functional layer when the light from the outside environment is incident on the illumination panel from the surface of the cover plate, thereby enhancing the reflectivity of the ambient light, reducing the ambient light entering the light-emitting substrate, avoiding the damage of the ambient light to the light-emitting device, and delaying the life attenuation speed of the illumination panel and the vehicle lamp.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present disclosure, and together with the specification, serve to explain the principles of the present disclosure. It is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0032] Figure 1 A schematic diagram of a light-emitting substrate in an embodiment of the illumination panel of the present disclosure.

[0033] Figure 2 A schematic diagram of an embodiment of the illumination panel of the present disclosure.

[0034] Figure 3 A schematic diagram of an absorbing layer in an embodiment of the illumination panel of the present disclosure.

[0035] Figure 4 A schematic diagram of a light-emitting functional layer in an embodiment of the illumination panel of the present disclosure.

[0036] Figure 5 A schematic diagram of a light-blocking part and a light-absorbing part in an embodiment of the illumination panel of the present disclosure.

[0037] Figure 6 A schematic diagram of an illumination panel and a circuit board in an embodiment of the illumination panel of the present disclosure.

[0038] Figure 7 A schematic diagram of an illumination panel and a circuit board in an embodiment of the illumination panel of the present disclosure.

[0039] Explanation of reference signs:

[0040] 1, first functional layer; 2, second functional layer; 21, plano-convex lens; 22, flat layer; 3, cover plate; 4, light-emitting layer; 40, light-emitting device; 41, first electrode; 42, light-emitting functional layer; 43, second electrode; 44, pixel definition layer; 441, pixel opening; 45, first light-emitting functional sub-layer; 451, first hole transport layer; 452, first light-emitting material sub-layer; 453, first electron transport layer; 46, second light-emitting functional sub-layer; 461, second hole transport layer; 462, second light-emitting material sub-layer; 463, second electron transport layer;

[0041] 5, driving circuit layer; 6, packaging layer; 60, frame glue; 7, absorbing layer; 71, light-shielding part; 72, light-absorbing part; 73, reflecting layer; 100, circuit board. DETAILED DESCRIPTION

[0042] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be embodied in many different 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 example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the specification. Moreover, the figures can not be to scale and some features can be exaggerated to show details of particular embodiments. The both the drawings and the detailed description are intended to serve an illustrative purpose, and not a limiting purpose.

[0043] The terms "one", "a", "an", "said", "the", and "s" are used to denote one or more elements, unless otherwise indicated; the terms "including", "has", and "having" are used to indicate an open-ended inclusion of elements, and that not all the elements listed are required; the terms "first", "second", and "third" and the like are merely used to identify elements, and do not require the objects to be limited in number.

[0044] According to one aspect of the present disclosure, a lighting panel is provided. Referring to Figures 1-2 As shown, the lighting panel can include a light-emitting substrate, a first functional layer 1, a second functional layer 2, and a cover plate 3. The cover plate 3 can be made of transparent materials such as acrylic or glass, and the light-emitting substrate includes a plurality of light-emitting devices 40, which are organic electroluminescent devices 40. The first functional layer 1 is disposed on one side of the light-emitting substrate, and the second functional layer 2 is disposed on the side of the first functional layer 1 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.

[0045] The lighting panel of the embodiment of the present 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 substrate on the light-emitting side. When the light from the external environment is incident on the lighting panel from the surface of the cover plate 3, the light reflected on the surface between the cover plate 3 and the second functional layer 2 and the light reflected on the surface between 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. Therefore, by adjusting the thickness of the second functional layer 2, the optical path difference of the above two reflected lights can be adjusted, the reflection of the light of a specific wavelength is enhanced by interference, so as to enhance the reflection of the ambient light, reduce the ambient light incident on the light-emitting substrate, avoid the damage of the ambient light to the light-emitting device 40, and slow down the life attenuation speed of the lighting panel and the vehicle lamp.

[0046] The parts of the lighting panel will be described in detail as follows:

[0047] The light-emitting substrate can include a driving back plate and a light-emitting layer 4 arranged on one side of the driving back plate. The driving back plate includes a substrate and a driving circuit layer 5. The substrate is in a flat plate structure and can be made of a flexible material such as polyimide PI material or glass. The driving circuit layer 5 is arranged on one side of the substrate and is used to drive the light-emitting layer 4 to emit light. The light-emitting layer 4 is arranged on the side of the driving circuit layer 5 away from the substrate. The first functional layer 1 is arranged on the side of the light-emitting layer 4 away from the driving back plate, and the cover plate 3 is parallel to the substrate. The light-emitting layer 4 can include a plurality of arrayed light-emitting devices 40. Each light-emitting device 40 can include a first electrode 41, a light-emitting functional layer 42 and a second electrode 43 which are sequentially stacked in the direction away from the driving back plate. The "orthographic projection on the light-emitting substrate" in the present disclosure can be understood as the orthographic projection on the substrate, i.e. the orthographic projection on the cover plate 3.

[0048] In one embodiment of the present disclosure, referring to Figure 1 As shown in the figure, the driving circuit layer 5 can be arranged on the side of the first electrode 41 close to the cover 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 can include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer and an electron injection layer which are sequentially stacked in the direction away from the cover plate 3.

[0049] The lighting panel can be divided into at least a lighting area and a peripheral area outside the lighting area, and the driving circuit layer 5 can also include pixel circuits in the lighting area and pixel circuits in the peripheral area. The peripheral circuits are connected to the pixel circuits and used to input driving signals to the pixel circuits, and the pixel circuits are used to drive the light emitting devices 40 to emit light. The second electrode 43 can extend to the peripheral area and be connected to a power signal terminal to receive a power signal. When the lighting panel is in operation, the pixel circuits can be used to apply a data signal to the first electrode 41, and the power signal terminal can be used to apply a power signal to the second electrode 43, so that electrons and holes recombine in the light emitting material layer to emit light from the light emitting functional layer 42. The number of pixel circuits is the same as the number of light emitting devices 40, and each pixel circuit is connected to a corresponding light emitting device 40 to control the light emitting device 40 to emit light, so that the lighting panel can realize patterned display.

[0050] The light emitting devices 40 include, but are not limited to, blue light emitting devices 40 for emitting blue light, red light emitting devices 40 for emitting red light, and green light emitting devices 40 for emitting green light, etc. In an embodiment of the present disclosure, the light emitting material of the light emitting material layer can be one or more of red light fluorescent material, red light phosphorescent material, red light thermally activated delayed fluorescence material, and red light quantum dot material. For example, the light emitting material of the light emitting material layer can be red light phosphorescent material, which has a long lifetime and a high internal quantum efficiency. Specifically, the light emitting material can be one or more of red light iridium complex btp2Ir(acac), Ir(piq)3, Ir(tiq)3, and Ir(fliq)3.

[0051] In the lighting panel of an embodiment of the present disclosure, the first electrode 41 is made of indium tin oxide transparent conductive film, and the second electrode 43 is made of opaque metal material such as Mg:Ag. The light emitted from 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, and the microcavity effect between the first electrode 41 and the second electrode 43 is very weak, which has little effect on the spatial light intensity distribution of the light emitted from the light emitting functional layer 42. Therefore, there is no serious brightness decay at each observation angle, which is beneficial to the uniform light emission of the lighting panel at a large viewing angle.

[0052] In another embodiment of the present disclosure, the driving circuit layer 5 can also be arranged on the side of the second electrode 43 away from the cover plate 3. For example, the first electrode 41 is a cathode, and the second electrode 43 is an anode. The light emitting functional layer 42 can include, in sequence from the direction away from the cover plate 3, an electron injection layer, an electron transport layer, a light emitting material layer, a hole transport layer, and a hole injection layer. The first electrode 41 can be made of indium tin oxide transparent conductive film or metal such as Ca / Ag, and the second electrode 43 can be made of opaque metal material. The light emitted from the light emitting functional layer 42 is emitted from the first electrode 41.

[0053] In one embodiment of the present disclosure, the light emitting layer 4 further comprises a pixel definition layer 44 for defining the range of each light emitting device 40. Taking the case that the driving circuit layer 5 is arranged on the side of the first electrode 41 close to the cover plate 3 as an example, the pixel definition layer 44 is provided with a plurality of pixel openings 441, each of which exposes the first electrode 41 of a corresponding light emitting device 40. In some embodiments, the light emitting functional 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 independently spaced from each other. The light emitting colors of different light emitting functional layers 42 can be different according to the light emitting materials. The second electrode 43 can cover the light emitting functional layers 42, so that each light emitting device 40 can share the same second electrode 43. Each light emitting device 40 can be defined by the above-mentioned pixel openings 441, and in the description of the present disclosure, the boundary of any light emitting device 40 is the boundary of the light emitting functional layer 42 within the corresponding pixel opening 441.

[0054] In another embodiment of the present disclosure, the light emitting functional layers 42 of each light emitting device 40 can also belong to the same continuous light emitting film layer, which covers the surfaces of each first electrode 41 and the pixel definition layer 44 away from the cover plate 3. The region of the light emitting film layer within the pixel opening 441 and laminated on the first electrode 41 is the light emitting functional layer 42 of the corresponding light emitting device 40, and the adjacent two light emitting functional layers 42 are connected through other regions of the light emitting film layer. That is, each light emitting device 40 can share the same light emitting film layer, and the light emitting colors of different light emitting functional layers 42 can be the same. For example, the light emitting colors of the light emitting functional layers 42 of the light emitting devices 40 can all be red.

[0055] In some embodiments of the present disclosure, it is referred to Figure 4As shown, each light emitting device 40 includes a first electrode 41, a second electrode 43, and a plurality of light emitting functional sub-layers between the first electrode 41 and the second electrode 43. The same light emitting device 40 can share the same first electrode 41 and the same second electrode 43, that is, the same light emitting unit can 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 which are connected in series in the direction away from the cover plate 3. The first light emitting functional sub-layer 45 can include a first hole transport layer 451, a first light emitting material sub-layer 452, and a first electron transport layer 453 which are arranged in the direction away from the cover plate 3 in sequence. The second light emitting functional sub-layer 46 can include a second hole transport layer 461, a second light emitting material sub-layer 462, and a second electron transport layer 463 which are arranged in the direction away from the cover plate 3 in sequence. In other embodiments, each light emitting device 40 can further include more light emitting functional sub-layers, and adjacent light emitting functional sub-layers can 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 light emitting functional sub-layers is not particularly limited herein. The light emitting materials of the light emitting material sub-layers can be the same or different.

[0056] Reference Figure 1 As shown, the illumination substrate can further include an encapsulation layer 6 which can cover the light emitting devices 40 for protecting the light emitting layer 4 and blocking water and oxygen in the external environment from corroding the light emitting devices 40. Taking the case where the driving circuit layer 5 is arranged on the side of the first electrode 41 close to the cover plate 3 as an example, the encapsulation layer 6 can be encapsulated in a thin film encapsulation manner or through a frame glue 60, and the encapsulation layer 6 can be arranged on the second electrode 43 on the side of the light emitting layer 4 away from the cover plate 3.

[0057] In an 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 1.6-2.0. Reference Figures 1-4 As shown, the second functional layer 2 can include a lens array which is arranged on the side of the cover plate 3 close to the light emitting layer 4 and includes a plurality of plano-convex lenses 21 which protrude in the direction away from the cover plate 3; and the second functional layer 2 further includes a flat layer 22 arranged on the side of the lens array away from the cover plate 3. The lens array can improve the light extraction efficiency of the illumination panel. For Figure 1 As shown in the illumination panel, the plano-convex lenses 21 of the lens array are arranged in an inverted manner relative to the light emitting direction of the illumination panel, that is, the flat surface of the plano-convex lens 21 is close to the cover plate 3, and the curved surface is close to the light emitting layer 4. This 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, which is conducive to simplifying the manufacturing process. In other embodiments of the present disclosure, it can be understood that the curved surface of the plano-convex lens 21 can be close to the cover plate 3, and the flat surface can be close to the light emitting layer 4.

[0058] The refractive index of the first functional layer 1 is lower than that of the second functional layer 2. In one embodiment of this disclosure, the refractive index of the first functional layer 1 can be 1.2 to 1.6. To enhance the interference between the light reflected from the interface between the cover plate 3 and the second functional layer 2 and the light reflected from the interface between the first functional layer 1 and the second functional layer 2, the thickness of the second functional layer 2 is d1 = λ / (4*n1), that is, the thickness of the second functional layer 2 is one-quarter of the wavelength of the reflected light. In one embodiment, the value of d1 is in the range of 10nm to 120nm, and in particular, the value of d1 can be in the range of 25nm to 60nm, which can reflect the high-energy violet to ultraviolet light 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, then the interference of ultraviolet light with a wavelength of 338.4nm is enhanced on both sides of the second functional layer 2, which can reduce the short-wavelength ultraviolet light entering the lighting panel.

[0059] In one embodiment of this disclosure, the first functional layer 1 is filled with scattering particles, which can be oxide particles, nitride particles, etc., which can improve the scattering ability of the first functional layer 1, increase the maximum light emission angle, make the light emitted from the light-emitting layer 4 more dispersed, and reduce the brightness difference from different viewing angles. Specifically, the scattering particles can be titanium oxide or silicon oxide particles, which have excellent scattering characteristics and relatively stable performance.

[0060] In one embodiment of this disclosure, the lighting panel further includes an absorption layer 7, which is disposed on the side of the first functional layer 1 near the light-emitting layer 4. (See reference...) Figure 1 As shown, the absorption layer 7 includes a plurality of light-transmitting holes penetrating the absorption layer 7 in a direction perpendicular to the cover plate 3, and light-shielding portions 71 located between each light-transmitting hole. The light-transmitting holes correspond to the light-emitting device 40 in a direction perpendicular to the cover plate 3. Each light-transmitting hole is filled with a light-absorbing portion 72, which absorbs ultraviolet light incident into the light-absorbing portion 72 and allows light emitted by the light-emitting device 40 to pass through. The light-shielding portion 71 can be made of black material and is used to absorb light incident into the light-shielding portion 71, as well as light incident from the light-emitting layer 4 into the light-shielding portion 71.

[0061] The light-absorbing portion 72 may include an ultraviolet absorber. For example, the light-absorbing portion 72 may be entirely made of polyimide, polyethylene terephthalate, silicon oxide, or silicon nitride, and may be doped with one or more of the following ultraviolet absorbers: salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, and hindered amines. In one embodiment, the main material of the light-absorbing portion 72 is silicon oxide and silicon nitride, and is doped with 0.5% benzotriazole.

[0062] In another embodiment of this disclosure, the light-absorbing portion 72 may include color-converting quantum dots. These quantum dots, when excited by ultraviolet light, can absorb ultraviolet light and emit light of a specific wavelength. Preferably, color-converting quantum dots, when excited by ultraviolet light, emit light that matches the light emitted by the light-emitting device 40. This allows the light-absorbing portion 72 to enhance the brightness of the lighting panel while simultaneously absorbing ultraviolet light. Furthermore, since the color-converting quantum dots are closer to the cover plate 3 than to the light-emitting device 40, and emit light in all directions after being excited, the uniformity of light emitted from the lighting panel can also be improved.

[0063] In one embodiment of this disclosure, the boundary of the orthographic projection of the light-transmitting 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 part 71 blocks the pixel definition layer 44 on the side of the pixel definition layer 44 near the cover plate 3, which can prevent ambient light from shining on the pixel definition layer 44 and causing air leakage in the pixel definition layer 44, shrinking the edge of the pixel opening 441, and shortening the lifespan of the light-emitting layer 4 or even causing it to fail. Further, in one embodiment, the light-transmitting hole shrinks from the end away from the cover plate 3 to the end closer to the cover plate 3, and the boundaries of the orthographic projections of the light-transmitting hole on the cover plate 3 on both the side closer to the cover plate 3 and the side away from the cover plate 3 are located within the boundary of the orthographic projection of the light-emitting device 40 on the cover plate 3.

[0064] For example, refer to Figures 3-5 As shown, the cross-sectional shape of the light-transmitting hole along the direction perpendicular to the cover plate 3 is a trapezoid that tapers towards the cover plate 3. On the cross-section of the lighting panel, the boundary of the orthographic projection of the side of the light-absorbing portion 72 facing away from the cover plate 3 coincides with the boundary of the orthographic projection of the light-emitting device 40 on the cover plate 3. The boundary of the orthographic projection of the side of the light-absorbing portion 72 closest to the cover plate 3 is located within the boundary of the orthographic projection of the light-emitting device 40 on the cover plate 3, and the distance between the two is b. In one embodiment of this disclosure, the value of b ranges from 0.176 μm to 1.76 μm, and the angle α between the waist of the trapezoidal cross-section of the light-transmitting hole in the direction perpendicular to the cover plate 3 and the surface of the light-shielding portion 71 facing away from the cover plate 3 is 100° to 150°. In one embodiment, α is 100° to 150°, b ranges from 0.88 μm to 1.056 μm, and the thickness of the corresponding absorption layer 7 is 0.5 μm to 6 μm. This ensures that the light-shielding part 71 effectively blocks the pixel definition layer 44 without affecting the light emission of the light-emitting device 40 to the outside of the illumination panel. The spacing c between the light-emitting devices 40 in the light-emitting layer 4 can range from 18 μm to 25 μm. Preferably, to optimize the matching effect with the light-absorbing part 72, the spacing c between the light-emitting devices 40 can range from 19 μm to 22 μm.

[0065] In one embodiment of this disclosure, reference is made to Figure 5As shown, the inner wall of the light-transmitting opening is provided with a reflective layer 73, so as to avoid the light emitted by the light-emitting device 40 being absorbed by the light-blocking part 71 when the light irradiates the inner wall of the light-transmitting opening, thereby improving the light-emitting efficiency of the illumination panel.

[0066] It should be noted that due to the upper limit of the manufacturing process precision, the actual shape of the cross section of the light-transmitting hole in 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, etc. As long as it is within the error range allowed by the manufacturing precision, it should still be regarded as a trapezoid. Thus, it can be further explained that the concepts of plane, perpendicular, etc. mentioned in the present disclosure are within the range allowed by the manufacturing process precision.

[0067] In other embodiments, the shape of the cross section of the light-transmitting hole in the direction perpendicular to the cover plate 3 may not be a trapezoid, for example, it may also be a rectangle or other shapes.

[0068] In an embodiment of the present disclosure, the first functional layer 1 can include a color filter part. At least part of the projection of the color filter part on the cover plate 3 overlaps with the light-emitting device 40, and the color filter part can be used to transmit light of a specific waveband. The light that can be transmitted by the color filter part corresponds to the light emitted by the light-emitting device 40, for example, the light-emitting device 40 is used to emit red light, and the color filter part is configured to transmit red light and reflect other non-red light.

[0069] In an embodiment, the second functional layer 2 can include a color filter part and a scattering part other than the color filter part, the color filter part corresponds to the light-absorbing part 72 and the light-emitting device 40 in the direction perpendicular to the cover plate 3, and the boundary of the orthographic projection of the light-emitting device 40 on the cover plate 3 is within the boundary of the orthographic projection of the color filter part on the cover plate 3. The scattering part can be filled with the aforementioned transparent scattering particles. In another embodiment, the second functional layer 2 as a whole can be configured to transmit light of a specific waveband, for example, the light-emitting device 40 is used 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.

[0070] According to another aspect of the present disclosure, a vehicle lamp is provided, which refers to Figures 6-7 As shown, it includes a circuit board 100, the illumination panel of any one of the above embodiments, and a housing. The illumination panel is bound to the circuit board 100, and the housing is provided on the light-emitting side of the illumination panel. The specific structure and advantages of the illumination panel have been described in detail in the above embodiments of the illumination panel, and will not be described here; the illumination panel as a whole can be rhombic, triangular, rectangular, or other shapes, and the housing can be transparent, red, or other colors. The vehicle lamp of the present disclosure can be a tail lamp, or other warning lights, decorative lights, etc., and can also be used as an indicator light on a traffic kiosk or other facilities.

[0071] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. 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

1. A lighting panel, characterized in that, include: A light-emitting substrate, comprising multiple light-emitting devices; The first functional layer is disposed on one side of the light-emitting substrate; The second functional layer is disposed on the side of the first functional layer away from the light-emitting substrate, and the refractive index of the second functional layer is higher than that of the first functional layer. A cover plate, wherein the refractive index of the cover plate is lower than that of the second functional layer; An absorption layer includes multiple light-absorbing portions and light-blocking portions that separate the light-absorbing portions; The absorption layer is disposed on the side of the first functional layer near the light-emitting substrate. The absorption layer has a plurality of light-transmitting holes that penetrate the absorption layer in a direction perpendicular to the cover plate. The light-absorbing part is filled in each of the light-transmitting holes in a corresponding manner. The boundary of the orthographic projection of the light-transmitting hole on the light-emitting substrate is located within the boundary of the light-emitting device. The light-absorbing part can absorb ultraviolet light incident into the light-absorbing part. 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.

2. The lighting panel according to claim 1, characterized in that, The first functional layer is used to transmit light of a first color and reflect light of a second color, wherein the first color of light includes the light emitted by the light-emitting device.

3. The lighting panel according to claim 2, characterized in that, The first functional layer includes a plurality of arrayed color filters, at least a portion of the orthographic projection of one of the color filters onto the light-emitting substrate overlaps with the light-emitting device, and the color filters are used to transmit light of a first color and reflect light of a second color.

4. The lighting panel according to claim 1, characterized in that, The light-absorbing part includes an ultraviolet light absorber; or... The light-absorbing part includes color-converting quantum dots. When excited by ultraviolet light, the color-converting quantum dots can absorb ultraviolet light and emit light of a third color, which includes the light emitted by the light-emitting device.

5. The lighting panel according to claim 1, characterized in that, The light-transmitting hole narrows from the end away from the light-emitting substrate to the end closer to the light-emitting substrate, and the boundary of the light-transmitting hole is the boundary of the end of the light-transmitting hole away from the light-emitting substrate.

6. The lighting panel according to claim 5, characterized in that, The cross-sectional shape of the light-transmitting hole along the direction perpendicular to the cover plate is a trapezoid that tapers towards the light-emitting substrate, and the angle between the waist of the trapezoid and the surface of the light-shielding part away from the light-emitting substrate is 100°~150°.

7. The lighting panel according to claim 1, characterized in that, The inner wall of the light-transmitting hole is provided with a reflective layer.

8. A vehicle light, characterized in that, include: Circuit board; The lighting panel according to any one of claims 1 to 7, wherein the lighting panel is bonded to the circuit board; The outer casing covers the light-emitting side of the lighting panel.

Images