Display panel and display device

Abstract

The invention provides a display panel and a display device, specifically, the display panel comprises a substrate, a light-emitting device and a first anti-reflection layer, the light-emitting device comprises micro light-emitting diodes (Micro-LEDs), and the micro light-emitting diodes (Micro-LEDs) are arranged on one side of the substrate in an array; the first anti-reflection layer is arranged on the side, away from the substrate, of the light-emitting device, and the refractive index of the first anti-reflection layer is larger than 1.3. Wherein the first anti-reflection layer is located on one side of the light-emitting surface of the display panel, the number of light rays penetrating through the display panel when the light-emitting device emits light can be increased, the light transmittance of the display panel can be improved, then the reflectivity in the display panel is reduced, and the display consistency is improved.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a display panel and a display device. Background Art

[0002] Micro LED displays are miniaturized LED arrays. After the LED structure design is thin-filmed, miniaturized, and arrayed, it is transferred in large quantities to the driving substrate, and then a protective layer is generated using thin-film deposition technology to form LEDs with nanometer-level spacing. Compared with liquid crystal displays (LCDs) and organic light-emitting semiconductors (OLEDs), Micro LEDs have the advantages of higher brightness and efficiency, shorter response time, longer life, and a wider operating range. They are considered to be the development direction of displays and can be applied to terminal products such as televisions, augmented and virtual reality (AR / VR), car displays, wearable devices, and smartphones.

[0003] However, since the packaging solution for Micro-LED display panels is still immature, there are problems with excessive reflectivity and poor display consistency.

[0004] Therefore, there is an urgent need to improve the display panel to reduce the reflectivity in the display panel. Summary of the invention

[0005] The present application provides a display panel and a display device, which can reduce the reflectivity in the display panel and improve the display consistency.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a display panel, which includes a substrate, a light-emitting device and a first anti-reflection layer, wherein the light-emitting device includes a micro light-emitting diode Micro-LED, and the array is arranged on one side of the substrate; the first anti-reflection layer is arranged on the side of the light-emitting device away from the substrate, and the refractive index of the first anti-reflection layer is greater than 1.3.

[0007] Wherein, the refractive index of the first anti-reflection layer is less than or equal to 1.4.

[0008] Preferably, the ratio of the refractive index to the thickness of the first antireflection layer is 0.0065-0.028, wherein the unit of the thickness is nm.

[0009] The display panel further comprises a second anti-reflection layer, which is located on a side of the first anti-reflection layer away from the substrate, and protects the first anti-reflection layer from being disturbed by water vapor.

[0010] Preferably, the thickness of the second antireflection layer is greater than that of the first antireflection layer.

[0011] Preferably, the thickness of the second antireflection layer is 1-10 um.

[0012] Preferably, the refractive index ratio of the first antireflection layer and the second antireflection layer is 1.3-1.4:1.3-1.6;

[0013] Preferably, the ratio of the refractive index to the thickness of the second antireflection layer is 0.13-1.6, wherein the unit of the thickness is um.

[0014] The display panel further includes an encapsulation layer, which is at least partially located between the first anti-reflection layer and the light-emitting device, and the encapsulation layer protects the light-emitting device from being disturbed by water vapor.

[0015] Preferably, the side of the encapsulation layer facing away from the second encapsulation layer has a rough surface.

[0016] The first anti-reflection layer has a rough surface on a side facing away from the encapsulation layer, and / or the second anti-reflection layer has a rough surface on a side facing away from the first anti-reflection layer.

[0017] The light emitting device has a convex surface on the light emitting side, and the first anti-reflection layer covers the convex surface.

[0018] Preferably, the vertical cross-section of the raised surface is trapezoidal; or the vertical cross-section of the raised surface is semicircular, and the first anti-reflective layer and the raised surface are conformal.

[0019] The display panel further includes a third anti-reflection layer, which is located on a side of the first anti-reflection layer away from the light-emitting device. The third anti-reflection layer can further reduce the reflectivity of the display panel and improve the display effect.

[0020] Wherein, the third anti-reflection layer is silver glass, or a silver film layer.

[0021] Preferably, the refractive index of the third antireflection layer is 1.3-1.6.

[0022] Preferably, the ratio of the refractive index to the thickness of the third antireflection layer is 4.33-16, wherein the unit of the thickness is mm.

[0023] The refractive index ratio of the first antireflection layer, the second antireflection layer and the third antireflection layer is 1.3-1.4: 1.3-1.6: 1.3-1.6.

[0024] Preferably, the ratio of the refractive index to the thickness of the first antireflection layer, the second antireflection layer and the third antireflection layer is 6.5-28: 0.13-1.6: 0.0043-0.016, wherein the unit of thickness is um.

[0025] Another technical solution adopted by the present application is: to provide a display device, which includes the display panel described in any one of the above embodiments.

[0026] The beneficial effect of the present application is: by adding a first anti-reflection layer to the display panel, and the first anti-reflection layer is arranged on the side of the light-emitting device away from the substrate, that is, the first anti-reflection layer is located on the light-emitting surface side of the display panel, the amount of light passing through the display panel when the light-emitting device emits light can be increased, the transmittance of the display panel can be improved, and then the reflectivity in the display panel can be reduced, thereby improving the display consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0028] Figure 1 is a schematic structural diagram of an embodiment of a display panel in the present application;

[0029] Figure 2 is a schematic structural diagram of another embodiment of a display panel in the present application;

[0030] Figure 3 is a structural schematic diagram of another embodiment of a display panel in the present application;

[0031] Figure 4 is a structural schematic diagram of yet another embodiment of a display panel in the present application;

[0032] Explanation of the reference numerals: 1 substrate; 2 electrode layer; 3 passivation layer; 4 insulating layer; 5 encapsulation layer; 51 first encapsulation layer; 52 second encapsulation layer; 53 third encapsulation layer; 54 rough surface; 61 first anti-reflection layer; 62 second anti-reflection layer; 63 third anti-reflection layer; 7 light-emitting device. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] See also Figure 1 and Figure 2 The present application provides a display panel, which includes a substrate 1, a light-emitting device 7 and a first anti-reflection layer 61, wherein the light-emitting device 7 includes a micro light-emitting diode Micro-LED, and the array is arranged on one side of the substrate 1; the first anti-reflection layer 61 is arranged on the side of the light-emitting device 7 away from the substrate 1, and the refractive index of the first anti-reflection layer 61 is greater than 1.3.

[0035] Specifically, the substrate 1 can be a rigid substrate 1, such as a substrate, or a flexible substrate 1, such as a polyimide film PI. A light-emitting device 7 is bound to one side of the substrate 1, and the light-emitting device 7 can be a Micro-LED, which can be arranged in an array on one side of the substrate 1. The display panel also includes an electrode layer 2, a passivation layer 3 and an insulating layer 4, wherein the electrode layer 2, the passivation layer 3 and the insulating layer 4 are sequentially stacked on the side of the substrate 1 facing the light-emitting device 7, and the Micro-LED is connected to the electrode layer 2 through the through holes of the passivation layer 3 and the insulating layer 4, so that the Micro-LED is electrically conductive, and the lighting, flashing or shutting down of the Micro-LED can be controlled. The passivation layer 3 can be used to protect the solder joints of the Micro-LED to prevent the solder joints from being corroded by water vapor. In addition, a first anti-reflection layer 61 can be provided on the side of the light-emitting device 7 away from the substrate 1, wherein the refractive index of the first anti-reflection layer 61 is greater than 1.3. The refractive index of the first antireflection layer 61 can be 1.31, 1.35, 1.4, 1.45, 1.5, 1.55, or 1.6. By controlling the refractive index of the first antireflection layer 61, the reflectivity of the display panel can be adjusted, which is beneficial to achieving low reflectivity in the display panel.

[0036] In one embodiment, by adding a first anti-reflection layer 61 to the display panel, and the first anti-reflection layer 61 is arranged on the side of the light-emitting device 7 facing away from the substrate 1, that is, the first anti-reflection layer 61 is located on the light-emitting surface side of the display panel, the amount of light passing through the display panel when the light-emitting device 7 emits light can be increased, the transmittance of the display panel can be improved, and then the reflectivity in the display panel can be reduced, thereby improving the display consistency.

[0037] In one embodiment, the refractive index of the first antireflection layer 61 is less than or equal to 1.4; specifically, the refractive index of the first antireflection layer 61 can be 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, 1.4. By controlling the refractive index of the first antireflection layer 61 to be between 1.3 and 1.4, the refractive index of the first antireflection layer 61 is relatively low, which can reduce the reflectivity of the display panel, increase the light output, and improve the display effect of the display panel.

[0038] Preferably, the ratio of the refractive index to the thickness of the first antireflection layer 61 is 0.0065 to 0.028, wherein the unit of thickness is nm. Specifically, the first antireflection layer 61 has a thickness of 50 to 200 nm, which is relatively thin and does not occupy too much space, thereby improving the integration of the display panel. By controlling the ratio of the refractive index to the thickness of the first antireflection layer 61 to be between 0.0065 and 0.028, it is beneficial to achieve the effect of the first antireflection layer 61 reducing the reflectivity of the display panel. The material of the first antireflection layer 61 can be lithium fluoride LiF or magnesium fluoride MgF2 , ensuring the effect of reducing the reflectivity of the display panel. The first anti-reflection layer 61 can be prepared by evaporation, such as electron beam evaporation, thermal evaporation, etc., or by magnetron sputtering. There are various preparation methods, which can be selected according to actual needs.

[0039] See also Figure 2 The display panel further includes a second anti-reflection layer 62, wherein the second anti-reflection layer 62 is located on the side of the first anti-reflection layer 61 away from the substrate 1, and protects the first anti-reflection layer 61 from water vapor interference. Specifically, the second anti-reflection layer 62 can be an organic layer, which mainly refers to a transparent polymer film prepared by ink jet printing (IJP) technology, and has the advantage of good encapsulation effect.

[0040] Preferably, the thickness of the second anti-reflection layer 62 is greater than the thickness of the first anti-reflection layer 61; by designing that the thickness of the second anti-reflection layer 62 is greater than the thickness of the first anti-reflection layer 61, the second anti-reflection layer 62 can compensate for the defect of the first anti-reflection layer 61 being susceptible to water vapor and oxygen, and protect the first anti-reflection layer 61 from interference from water and oxygen, thereby improving the service life of the display panel, while ensuring the advantage of low reflectivity in the display panel.

[0041] In one embodiment, the thickness of the second antireflection layer 62 is 1-10 um. The design that the second antireflection layer 62 covers the first antireflection layer 61 improves the water-proof oxygen performance of the first antireflection layer 61.

[0042] Preferably, the ratio of the refractive index to the thickness of the second antireflection layer 62 is 0.13 to 1.6, wherein the unit of the thickness is um. By controlling the ratio of the refractive index to the thickness of the second antireflection layer 62 to be between 0.13 and 1.6, it is beneficial to achieve a better effect of the second antireflection layer 62 in reducing the reflectivity of the display panel, and at the same time, it can also achieve a better packaging effect, thereby extending the service life of the display panel.

[0043] Preferably, the refractive index ratio of the first antireflection layer 61 and the second antireflection layer 62 is 1.3-1.4:1.3-1.6; by using the first antireflection layer 61 and the second antireflection layer 62 in combination, and the refractive indexes of the first antireflection layer 61 and the second antireflection layer 62 are both low, a better effect of reducing the reflectivity of the display panel can be achieved. At the same time, the refractive index of the first antireflection layer 61 can be greater than, less than or equal to the refractive index of the second antireflection layer 62.

[0044] See also Figure 3In one embodiment, the display panel further includes an encapsulation layer 5, which is at least partially located between the first anti-reflection layer 61 and the light-emitting device 7. The encapsulation layer 5 protects the light-emitting device 7 from water vapor interference and plays a role in protecting the light-emitting device 7. Among them, the side of the encapsulation layer 5 away from the light-emitting device 7 has a rough surface 54. The rough surface 54 can be processed by low-energy plasma on the side of the encapsulation layer 5 away from the light-emitting device 7. By improving the roughness of the side of the encapsulation layer 5 away from the light-emitting device 7, dizziness due to excessive brightness can be prevented, thereby improving the user's experience.

[0045] In one embodiment, the encapsulation layer 5 includes a first encapsulation layer 51, a second encapsulation layer 52 and a third encapsulation layer 53, wherein the first encapsulation layer 51 is located on the side of the light emitting device 7 away from the substrate 1, and is used to cover the exposed surface of the light emitting device 7 to protect the light emitting device 7 from water vapor corrosion. The second encapsulation layer 52 is located on the side of the first encapsulation layer 51 away from the light emitting device 7, and the orthographic projection of the second encapsulation layer 52 on the layer where the light emitting device 7 is located does not overlap with the light emitting device 7. In one embodiment, the second encapsulation layer 52 can be a black matrix to avoid crosstalk between light emitted by light emitting devices 7 of different colors. The third encapsulation layer 53 is located on the side of the second encapsulation layer 52 away from the light emitting device 7, and the third encapsulation layer 53 is located on the side of the second encapsulation layer 52 away from the light emitting device 7. The third encapsulation layer 53 can be made of a material with high light transmittance and high hardness, so that the light emitted by the light emitting device 7 can be emitted outward through the third encapsulation layer 53. At the same time, the third encapsulation layer 53 can protect the light emitting device 7 from being damaged in subsequent process steps.

[0046] Further, the first anti-reflection layer 61 has a rough surface 54 on the side facing away from the encapsulation layer 5, and / or the second anti-reflection layer 62 has a rough surface 54 on the side facing away from the first anti-reflection layer 61. Since the surface of the encapsulation layer 5 on the side facing away from the light-emitting device 7 is a rough surface 54, when the first anti-reflection layer 61 and the second anti-reflection layer 62 are subsequently prepared, the first anti-reflection layer 61 and the second anti-reflection layer 62 both have a rough surface 54, and the rough surface 54 can diffusely reflect the light passing through the first anti-reflection layer 61 and the second anti-reflection layer 62, thereby preventing the user from being dizzy when the brightness of the display panel is too high.

[0047] See also Figure 4, the light-emitting device 7 has a convex surface on the light-emitting side. Specifically, the first encapsulation layer 51 is at least partially located on the side of the light-emitting device 7 away from the substrate 1, and is used to cover the exposed surface of the light-emitting device 7 to protect the light-emitting device 7 from water vapor erosion, so that the first encapsulation layer 51 is convexly arranged on the light-emitting side of the light-emitting device 7, and the second encapsulation layer 52 is arranged on both sides of the light-emitting side of the light-emitting device 7, and the second encapsulation layer 52 does not cover the light-emitting side of the light-emitting device 7, so that the upper surface of the first encapsulation layer 51 covering the light-emitting side of the light-emitting device 7 is higher than the upper surface of the second encapsulation layer 52 facing away from the substrate 1, that is, the height between the upper surface of the first encapsulation layer 51 covering the light-emitting side of the light-emitting device 7 and the substrate 1 is greater than the height between the upper surface of the second encapsulation layer 52 and the substrate 1, so that the light-emitting device 7 has a convex surface on the light-emitting side, and the third encapsulation layer 53 and the first anti-reflection layer 61 cover the convex surface. When the first anti-reflection layer 61 covers the raised surface, the light emitted by the light emitting device 7 needs to pass through the first anti-reflection layer 61 to be emitted. The refractive index of the first anti-reflection layer 61 is relatively low, which can achieve the effect of increasing the amount of light emitted. Specifically, the light emitting device 7 has a raised surface on the light emitting side, so that the refraction degree of the light by the raised surface located at the side of the light emitting device 7 is increased, and the propagation direction of the light emitted from the side of the light emitting device 7 can be adjusted to propagate away from the substrate 1, so that the light extraction efficiency of the light emitting device 7 is higher, thereby improving the brightness of the display panel.

[0048] Preferably, the vertical cross-section of the raised surface is trapezoidal; or the vertical cross-section of the raised surface is semicircular, and the first anti-reflection layer 61 is conformal to the raised surface. When the raised surface is trapezoidal or semicircular, the refractive index increases at the side of the raised surface, so that the degree of refraction of the light passing through the side of the raised surface becomes larger, so that the emitted light is refracted in a predetermined direction, that is, propagated to the side away from the substrate 1. Therefore, the trapezoidal or semicircular raised surface can be used to change the angle of the light emitted from the light emitting device 7 to diverge to the side, so that the light is irradiated in a predetermined direction. The predetermined direction is the direction away from the substrate 1, that is, toward Figure 1 The light propagates above the light emitting device 7.

[0049] Please continue reading Figure 2 The display panel further includes a third anti-reflection layer 63, which is located on the side of the first anti-reflection layer 61 away from the light emitting device 7, wherein the third anti-reflection layer 63 can further reduce the reflectivity of the display panel and improve the display effect. Specifically, the third anti-reflection layer 63 can be stacked on the side of the second anti-reflection layer 62 away from the first anti-reflection layer 61.

[0050] Furthermore, the third anti-reflection layer 63 is silver glass or a silver film layer, wherein the preparation process of the silver glass can be atomized spraying or directly attached, and the silver film layer can be prepared by atomized liquid spraying. Low-reflection silver AG glass has a lower reflectivity, can reduce the reflectivity of light, and can reduce the interference of ambient light, improve the clarity of the display screen, make the image clearer and more realistic, and let the viewer enjoy a better visual effect. In addition, both the silver glass and the silver film layer can achieve the effect of reducing the reflectivity of the display panel and improving the display effect.

[0051] Preferably, the refractive index of the third antireflection layer 63 is 1.3-1.6; specifically, the refractive index of the third antireflection layer 63 can be 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, etc. The third antireflection layer 63 has a lower refractive index, which is conducive to achieving a better display effect in the display panel.

[0052] Preferably, the ratio of the refractive index to the thickness of the third antireflection layer 63 is 4.33 to 16, wherein the unit of the thickness is mm. In one embodiment, the thickness of the third antireflection layer 63 may be 0.1 to 0.3 mm. By controlling the ratio of the refractive index to the thickness of the third antireflection layer 63 to be between 4.33 and 16, it is beneficial to achieve a better effect of the third antireflection layer 63 in reducing the reflectivity of the display panel and improving the display effect.

[0053] In one embodiment, the refractive index ratio of the first antireflection layer 61, the second antireflection layer 62 and the third antireflection layer 63 is 1.3-1.4: 1.3-1.6: 1.3-1.6. In one embodiment, the ratio of the refractive index and thickness of the first antireflection layer 61, the second antireflection layer 62 and the third antireflection layer 63 is 6.5-28: 0.13-1.6: 0.0043-0.016, wherein the unit is um. Specifically, the refractive index of the first antireflection layer 61 is 1.3-1.4, the refractive index of the second antireflection layer 62 is 1.3-1.6, and the refractive index of the third antireflection layer 63 is 1.3-1.6. The thickness of the first antireflection layer 61 is 50-200 nm; the thickness of the second antireflection layer 62 is 1-10 um, and the thickness of the third antireflection layer 63 is 0.1-0.3 mm. In the present application, through the combined application of the first anti-reflection layer 61, the second anti-reflection layer 62 and the third anti-reflection layer 63, the three anti-reflection layers can all play a role in reducing the reflectivity in the display panel, so that the transmittance of the light emitted by the light-emitting device 7 is high, thereby improving the display effect of the display panel.

[0054] The present application also provides a display device, which includes a display panel according to any one of the above embodiments. Therefore, the display device has all the features and advantages of the display panel described above. Specifically, the display device includes a mobile or fixed terminal such as an electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a smart bracelet, a smart watch, a super personal computer, and a navigator.

[0055] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: include: Substrate, Light-emitting devices, including micro light-emitting diodes Micro-LED, arrayed on one side of the substrate; The first anti-reflection layer is arranged on a side of the light-emitting device away from the substrate, and the refractive index of the first anti-reflection layer is greater than 1.

3.

2. The display panel according to claim 1, characterized in that: The refractive index of the first antireflection layer is less than or equal to 1.4; Preferably, the ratio of the refractive index to the thickness of the first antireflection layer is 0.0065-0.028, wherein the unit of the thickness is nm.

3. The display panel according to claim 2, characterized in that: Also includes: A second anti-reflection layer, located on a side of the first anti-reflection layer away from the substrate; Protecting the first anti-reflection layer from water vapor interference; Preferably, the thickness of the second antireflection layer is greater than the thickness of the first antireflection layer; Preferably, the thickness of the second antireflection layer is 1 to 10 um; Preferably, the refractive index ratio of the first antireflection layer and the second antireflection layer is: 1.3～1.4：1.3～1.6； Preferably, the ratio of the refractive index to the thickness of the second antireflection layer is 0.13-1.6, wherein the unit of the thickness is um.

4. The display panel according to claim 3, characterized in that: Also includes: an encapsulation layer, at least part of which is located between the first anti-reflection layer and the light-emitting device, and the encapsulation layer protects the light-emitting device from water vapor interference; Preferably, a side of the encapsulation layer facing away from the substrate has a rough surface.

5. The display panel according to claim 4, characterized in that: The first anti-reflection layer has a rough surface on a side facing away from the encapsulation layer, and / or the second anti-reflection layer has a rough surface on a side facing away from the first anti-reflection layer.

6. The display panel according to claim 3, characterized in that: The light emitting device has a convex surface on the light emitting side, and the first anti-reflection layer covers the convex surface; Preferably, the vertical cross-section of the convex surface is trapezoidal; or the vertical cross-section of the convex surface is semicircular, and the first anti-reflective layer is conformal to the convex surface.

7. The display panel according to claim 6, characterized in that: Also includes: The third anti-reflection layer is located on a side of the first anti-reflection layer away from the light-emitting device.

8. The display panel according to claim 7, characterized in that: The third anti-reflection layer is silver glass or a silver film layer; Preferably, the refractive index of the third antireflection layer is 1.3-1.6; Preferably, the ratio of the refractive index to the thickness of the third antireflection layer is 4.33-16, wherein the unit of the thickness is mm.

9. The display panel according to claim 8, characterized in that: The refractive index ratio of the first antireflection layer, the second antireflection layer and the third antireflection layer is 1.3-1.4:1.3-1.6:1.3-1.6; Preferably, the ratio of the refractive index to the thickness of the first antireflection layer, the second antireflection layer and the third antireflection layer is 6.5-28: 0.13-1.6: 0.0043-0.016, wherein the unit of thickness is um.

10. A display device, characterized in that: A display panel comprising any one of claims 1-9.

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