Display panel and display device

Abstract

The utility model discloses a display panel and a display device. The display panel comprises a substrate; the light-emitting device layer is located on one side of the substrate, and the light-emitting device layer comprises a plurality of light-emitting units; the insulating layer is located on the side, away from the substrate, of the light-emitting device layer; the insulating layer comprises a first insulating layer and a second insulating layer, the first insulating layer corresponds to the light-emitting unit and is of a wide-end-up structure, and the upper portion of the first insulating layer is far away from the substrate; the second insulating layer is arranged around the first insulating layer, and the second insulating layer is in contact with the first insulating layer; the refractive index of the first insulating layer is larger than that of the second insulating layer. The light emitting efficiency of the display panel can be remarkably improved.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display panels can be made lighter and thinner, and have better flexibility and curvature, so OLED display technology will be the future development trend.

[0003] Currently, a polarizer is disposed on the light-emitting side of an OLED display panel, but the polarizer will cause a significant loss in the light-emitting efficiency of the OLED display panel. Utility Model Content

[0004] The utility model provides a display panel and a display device to solve the problem of large light extraction efficiency loss of an OLED display panel.

[0005] In a first aspect, the utility model provides a display panel, the display panel comprising:

[0006] substrate;

[0007] A light emitting device layer, located on one side of the substrate, the light emitting device layer includes a plurality of light emitting units;

[0008] The insulating layer is located on a side of the light-emitting device layer away from the substrate; the insulating layer includes a first insulating layer and a second insulating layer, the first insulating layer is arranged corresponding to the light-emitting unit, the first insulating layer is a structure of being wide at the top and narrow at the bottom, and the upper part of the first insulating layer is arranged away from the substrate;

[0009] The second insulating layer is disposed around the first insulating layer, and the second insulating layer is in contact with the first insulating layer; and the refractive index of the first insulating layer is greater than the refractive index of the second insulating layer.

[0010] Optionally, the insulating layer further comprises:

[0011] A third insulating layer, the third insulating layer includes a first portion and a second portion, the first portion and the second portion are connected; the second portion is located between the light emitting device layer and the second insulating layer; and the first portion is located on a side of the second insulating layer away from the first insulating layer;

[0012] Or the third insulating layer includes a first portion, and the first portion is located on a side of the second insulating layer away from the first insulating layer.

[0013] Optionally, the second insulating layer is embedded in the third insulating layer.

[0014] Optionally, in the thickness direction of the display panel, a cross-sectional shape of the first insulating layer includes an inverted trapezoid.

[0015] Optionally, in the thickness direction of the display panel, the cross-sectional shape of the first insulating layer includes a combination of an inverted trapezoid and a rectangle, and the long side of the rectangle coincides with the lower base of the inverted trapezoid.

[0016] Optionally, in the thickness direction of the display panel, the cross-sectional shape of the second insulating layer includes a triangle, and the cross-sectional shape of the first insulating layer includes an inverted trapezoid or a combination of an inverted trapezoid and a rectangle, and the side length of the triangle close to the inverted trapezoid is equal to the waist of the inverted trapezoid.

[0017] Optionally, the first insulating layer includes a transparent organic insulating layer or a transparent inorganic insulating layer; the second insulating layer includes a transparent organic insulating layer or a transparent inorganic insulating layer;

[0018] The third insulating layer includes a black organic insulating layer or a black inorganic insulating layer.

[0019] Optionally, the display panel further includes:

[0020] The encapsulation layer is located between the light emitting device layer and the insulating layer; the light emitting device layer includes an array layer, which is located on a side of the light emitting unit close to the substrate.

[0021] Optionally, the display panel further includes:

[0022] A touch layer, located between the encapsulation layer and the insulating layer;

[0023] The second insulating layer contacts the touch layer, or the insulating layer further includes a third insulating layer, and the second insulating layer and the touch layer are separated by a portion of the third insulating layer.

[0024] In a second aspect, the utility model provides a display device, which includes the display panel provided in the first aspect.

[0025] The technical solution of the utility model provides a display panel and a display device, wherein a first insulating layer and a second insulating layer are arranged, wherein the first insulating layer is arranged in one-to-one correspondence with the light-emitting unit, and the second insulating layer is arranged around the first insulating layer and in contact with the first insulating layer, and at the same time, the refractive index of the first insulating layer is greater than the refractive index of the second insulating layer, so that light rays at a large angle to a direction perpendicular to the display panel are totally reflected at the interface between the first insulating layer and the second insulating layer and emitted from the first insulating layer, thereby significantly improving the light extraction efficiency of the display panel.

[0026] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of a display panel provided by an embodiment of the utility model;

[0029] Figure 2 is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the utility model;

[0030] Figure 3 It is a plan view of a display panel provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Figure 1 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the utility model, Figure 2 It is a schematic cross-sectional structure diagram of another display panel provided by an embodiment of the utility model. Figure 3 is a plan view of a display panel provided by an embodiment of the utility model, the display panel includes a display area 6 and a display peripheral area 7, Figure 1 and Figure 2yes Figure 3 The cross-sectional view after cutting along the dotted line AB. Figure 1 or Figure 2 As shown, the display panel includes: a substrate 1 ; a light emitting device layer 2 located on one side of the substrate 1 , and the light emitting device layer 2 includes a plurality of light emitting units 21 .

[0034] The insulating layer 3 is located on the side of the light-emitting device layer 2 away from the substrate 1; the insulating layer 3 includes a first insulating layer 31 and a second insulating layer 32, the first insulating layer 31 is arranged corresponding to the light-emitting unit 21, the first insulating layer 31 is a structure that is wide at the top and narrow at the bottom, and the upper part of the first insulating layer 31 is arranged away from the substrate 1.

[0035] The second insulating layer 32 is disposed around the first insulating layer 31 , and the second insulating layer 32 is in contact with the first insulating layer 31 ; the refractive index of the first insulating layer 31 is greater than the refractive index of the second insulating layer 32 .

[0036] Specifically, the display panel includes a substrate 1, which is the basis of the entire display panel. The substrate 1 may be a rigid substrate, and illustratively, the substrate 1 may be a glass substrate. The substrate 1 may also be a flexible substrate, and may be formed of any suitable insulating material having flexibility to achieve flexible curling of the display panel. Exemplarily, the substrate 1 may be formed of a polymer material such as polyacrylate, polyethylene naphthalate or polyethylene terephthalate, which is not specifically limited herein.

[0037] The display panel further includes a light emitting device layer 2, which is disposed on one side of the substrate 1. The light emitting device layer 2 includes a plurality of light emitting units 21, and the light emitting unit 21 may include an anode, a cathode 212, and a light emitting layer 211 between the anode and the cathode 212. A certain voltage is applied between the anode and the cathode 212 to drive the light emitting layer 211 to emit light, thereby achieving light emission of the light emitting unit 21.

[0038] The display panel further includes an insulating layer 3, which is disposed on a side of the light emitting device layer 2 away from the substrate 1, and the insulating layer 3 may include a first insulating layer 31 and a second insulating layer 32. The first insulating layer 31 includes an upper portion and a lower portion, the upper portion of the first insulating layer 31 is disposed away from the substrate 1, and the lower portion of the first insulating layer 31 is disposed close to the substrate 1, and the first insulating layer 31 may be a structure in which the upper portion is wide and the lower portion is narrow. The first insulating layer 31 is disposed in a one-to-one correspondence with the light emitting layer 211. The second insulating layer 32 may be disposed on both sides of the first insulating layer 31, or the second insulating layer 32 may be disposed on both sides of the first insulating layer 31 and on the side of the upper portion away from the substrate 1. The first insulating layer 31 is in contact with the second insulating layer 32, and the refractive index of the first insulating layer 31 is greater than the refractive index of the second insulating layer 32.

[0039] like Figure 1 or Figure 2As shown, the light-emitting unit 21 can emit light as shown by light 2, and light 2 will be emitted through the first insulating layer 31. The light-emitting unit 21 can also emit light as shown by light 1, and light 1 is totally reflected at the interface between the first insulating layer 31 and the second insulating layer 32, and is emitted in a direction perpendicular to the display panel. By setting the first insulating layer 31 and the second insulating layer 32, and setting the refractive index of the first insulating layer 31 to be greater than the refractive index of the second insulating layer 32, the light at a large angle to the direction perpendicular to the display panel can be totally reflected at the interface between the first insulating layer 31 and the second insulating layer 32, and emitted from the first insulating layer 31. At the same time, by setting the first insulating layer 31 to be a structure with a wide upper portion and a narrow lower portion, the incident angle of more light at the interface between the first insulating layer 31 and the second insulating layer 32 can be greater than a certain threshold, satisfying the condition of total reflection.

[0040] The technical solution of the embodiment of the utility model provides a display panel, by setting a first insulating layer and a second insulating layer, the first insulating layer is set in a one-to-one correspondence with the light-emitting unit, the second insulating layer is set around the first insulating layer and in contact with the first insulating layer, and at the same time the refractive index of the first insulating layer is greater than the refractive index of the second insulating layer, so that the light at a large angle to the direction perpendicular to the display panel is totally reflected at the interface between the first insulating layer and the second insulating layer and emitted from the first insulating layer, which can significantly improve the light extraction efficiency of the display panel.

[0041] Optional, continue to refer to Figure 1 or Figure 2 The insulating layer 3 also includes: a third insulating layer 33, the third insulating layer 33 includes a first part 331 and a second part 332, the first part 331 and the second part 332 are connected; the second part 332 is located between the light emitting device layer 2 and the second insulating layer 32; the first part 331 is located on the side of the second insulating layer 32 away from the first insulating layer 31.

[0042] Or the third insulating layer 33 includes a first portion 331 , and the first portion 331 is located on a side of the second insulating layer 32 away from the first insulating layer 31 .

[0043] Specifically, the insulating layer 3 may include a first insulating layer 31, a second insulating layer 32 and a third insulating layer 33. Figure 1 As shown, the third insulating layer 33 may include a first portion 331 and a second portion 332, the first portion 331 and the second portion 332 are connected and made of the same material; the second portion 332 is disposed between the light emitting device layer 2 and the second insulating layer 32; the first portion 331 is disposed on a side of the second insulating layer 32 away from the first insulating layer 31. When external light irradiates the surface of the display panel, for example, Figure 1As shown, when the external light 3, light 4 and light 5 irradiate the surface of the display panel, the light 4 and light 5 will be directly absorbed by the second portion 332 of the third insulating layer 33, while the light 3 will be absorbed by the first portion 331 of the third insulating layer 33.

[0044] like Figure 2 As shown, the third insulating layer 33 may include only the first portion 331, and the first portion 331 is disposed on a side of the second insulating layer 32 away from the first insulating layer 31. Exemplarily, when the external light 4 and the light 5 irradiate the surface of the display panel, the light 4 and the light 5 are directly absorbed by the second portion 332 of the third insulating layer 33.

[0045] By setting the first insulating layer 31, the second insulating layer 32 and the third insulating layer 33, the effect of removing the polarizer in the display panel can be achieved, that is, there is no need to set a polarizer in the display panel. By setting the third insulating layer 33, the glare caused by the external reflected light of the display panel is reduced. Since the polarizing layer is removed, the light output efficiency of the display panel is further improved. At the same time, the thickness of the display panel and the folding marks of the foldable display panel can be effectively reduced, thereby enhancing the display brightness of the display panel and reducing the power consumption of the display device.

[0046] The position, shape and size of the first insulating layer 31, the second insulating layer 32 and the third insulating layer 33 can be changed according to actual needs, so that the light extraction efficiency of the display panel and the degree of absorption of external light meet the requirements. For example, the light extraction efficiency of the display panel can be improved by increasing the overall width of the first insulating layer 31. The cross-sectional shape of the second insulating layer 32 can also be changed to a parallelogram, thereby improving the light extraction efficiency of the display panel. The area of ​​the cross-sectional shape of the third insulating layer 33 can also be increased, thereby further reducing the glare caused by the external reflected light of the display panel.

[0047] The insulating layer 3 can be prepared by processes such as photolithography, first forming the second portion 332 and part of the first portion 331 of the third insulating layer 33, then forming the second insulating layer 32, then forming the first insulating layer 31, and finally forming the remaining first portion 331 of the third insulating layer 33.

[0048] Optional, such as Figure 1 As shown, the second insulating layer 32 is embedded in the third insulating layer 33 .

[0049] Specifically, the third insulating layer 33 may include a first portion 331 and a second portion 332, wherein the second portion 332 is disposed between the light emitting device layer 2 and the second insulating layer 32, and the second insulating layer 32 is embedded in the third insulating layer 33. This arrangement allows external light (such as the light 3) to be absorbed, thereby reducing glare caused by external reflected light from the display panel.

[0050] Optional, such as Figure 2 As shown, in the thickness direction of the display panel, the cross-sectional shape of the first insulating layer 31 includes an inverted trapezoid.

[0051] Specifically, in the thickness direction of the display panel, the cross-sectional figure of the first insulating layer 31 may include an inverted trapezoid, and the side length of the upper base of the inverted trapezoid is greater than the side length of the lower base, thereby ensuring the structure of the first insulating layer 31 being wide at the top and narrow at the bottom. At the same time, the refractive index of the first insulating layer 31 is set to be greater than the refractive index of the second insulating layer 32, so that more light rays at a large angle to the direction perpendicular to the display panel can be totally reflected at the interface between the first insulating layer and the second insulating layer, thereby significantly improving the light extraction efficiency of the display panel.

[0052] Optional, such as Figure 1 As shown, in the thickness direction of the display panel, the cross-sectional shape of the first insulating layer 31 includes a combination of an inverted trapezoid and a rectangle, and the long side of the rectangle coincides with the lower base of the inverted trapezoid.

[0053] Specifically, in the thickness direction of the display panel, the cross-sectional pattern of the first insulating layer 31 may include a combination of an inverted trapezoid and a rectangle, and the long side of the rectangle coincides with the lower base of the inverted trapezoid. The structure of the first insulating layer 31 being wide at the top and narrow at the bottom is ensured, and the refractive index of the first insulating layer 31 is set to be greater than the refractive index of the second insulating layer 32, so that more light rays at a large angle to the direction perpendicular to the display panel can be totally reflected at the interface between the first insulating layer and the second insulating layer, significantly improving the light extraction efficiency of the display panel.

[0054] Optional, such as Figure 1 or Figure 2 As shown, in the thickness direction of the display panel, the cross-sectional shape of the second insulating layer includes a triangle, and the cross-sectional shape of the first insulating layer includes an inverted trapezoid or a combination of an inverted trapezoid and a rectangle, and the side length of the triangle close to the inverted trapezoid is equal to the waist of the inverted trapezoid.

[0055] Specifically, in the thickness direction of the display panel, the cross-sectional figure of the second insulating layer 32 may include a triangle. And one side of the triangle contacts the waist of the inverted trapezoid in the cross-sectional figure of the first insulating layer 31, and the side length of the side of the triangle in contact with the waist of the inverted trapezoid is the same as the length of the waist of the inverted trapezoid. By setting the cross-sectional figure of the second insulating layer 32 to a triangle, when external light is irradiated onto the surface of the display panel, the probability of contacting the third insulating layer 33 becomes greater, thereby further reducing the glare caused by the external reflected light of the display panel. At the same time, by setting the side length of one side of the triangle in contact with the waist of the inverted trapezoid to be the same as the length of the waist of the inverted trapezoid, more light rays at a large angle to the direction perpendicular to the display panel can be totally reflected at the interface between the first insulating layer 31 and the second insulating layer 32, thereby significantly improving the light extraction efficiency of the display panel.

[0056] Optionally, the first insulating layer includes a transparent organic insulating layer or a transparent inorganic insulating layer; the second insulating layer includes a transparent organic insulating layer or a transparent inorganic insulating layer;

[0057] The third insulating layer includes a black organic insulating layer or a black inorganic insulating layer.

[0058] Specifically, the material of the first insulating layer may include organic insulating materials and inorganic insulating materials, and the material of the first insulating layer needs to be a transparent material to prevent the first insulating layer from absorbing the light emitted by the light-emitting unit. Exemplarily, the material of the first insulating layer may be a transparent photoresist.

[0059] The material of the second insulating layer may include organic insulating materials and inorganic insulating materials, and the material of the second insulating layer needs to be a transparent material to prevent the second insulating layer from absorbing the light emitted by the light-emitting unit. Exemplarily, the material of the second insulating layer may also be a transparent photoresist. However, the refractive index of the first insulating layer must be greater than that of the second insulating layer.

[0060] The material of the third insulating layer may include organic insulating material and inorganic insulating material, and the material of the third insulating layer needs to be black material so that the third insulating layer can absorb the light irradiated on the surface of the display panel. Exemplarily, the material of the third insulating layer may be organic carbon black.

[0061] Continue to refer Figure 1 or Figure 2 The display panel further includes: an encapsulation layer 4 located between the light emitting device layer 2 and the insulating layer 3 ; the light emitting device layer 2 includes an array layer 22 located on a side of the light emitting unit 21 close to the substrate 1 .

[0062] In the embodiment of the present invention, the encapsulation layer 4 is a film layer that can effectively block external moisture or oxygen. The encapsulation layer 4 can be a thin film encapsulation (TFE) layer.

[0063] Specifically, the display panel may further include an encapsulation layer 4, which is disposed between the light-emitting device layer 2 and the insulating layer 3. The encapsulation layer 4 may effectively protect the light-emitting device layer 2 from being corroded by external moisture or oxygen. The second insulating layer 32 may be in contact with the encapsulation layer 4, or the insulating layer 3 may further include a third insulating layer 33, and the second insulating layer 32 and the encapsulation layer 4 are separated by a portion of the third insulating layer 33. The third insulating layer 33 may include only a first portion 331, in which case the second insulating layer 32 is in contact with the encapsulation layer 4; the third insulating layer 33 may include a first portion 331 and a second portion 332, in which case the second insulating layer 32 and the encapsulation layer 4 are separated by a portion of the third insulating layer 33.

[0064] The light emitting device layer 2 may include an array layer 22 and a light emitting unit 21, the light emitting unit 21 may include a cathode 212 and a light emitting layer 211, the array layer 22 may include an anode and a thin film transistor array. The light emitting layer 211 may be disposed between the array layer 22 and the cathode 212, the array layer 22 is disposed on a side of the light emitting layer 211 close to the substrate 1, and the cathode 212 is disposed on a side of the light emitting layer 211 away from the substrate 1.

[0065] Continue to refer Figure 1 or Figure 2 The display panel further includes: a touch layer 5 located between the encapsulation layer 4 and the insulating layer 3; a second insulating layer 32 contacts the touch layer 5, or the insulating layer 3 further includes a third insulating layer 33, and the second insulating layer 32 and the touch layer 5 are separated by a portion of the third insulating layer 33.

[0066] Specifically, the display panel may further include a touch layer 5, which is disposed between the encapsulation layer 4 and the insulating layer 3. The third insulating layer 33 may include only a first portion 331, in which case the second insulating layer 32 is in contact with the touch layer 5; the third insulating layer 33 may include a first portion 331 and a second portion 332, in which case the second insulating layer 32 and the touch layer 5 are separated by a portion of the third insulating layer 33.

[0067] An embodiment of the utility model provides a display device, which includes the display panel provided in any one of the above embodiments and has the beneficial effects of the display panel provided in any one of the above embodiments of the utility model.

[0068] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0069] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A display panel, characterized in that: include: substrate; A light emitting device layer, located on one side of the substrate, the light emitting device layer comprising a plurality of light emitting units; an insulating layer, located on a side of the light-emitting device layer away from the substrate; the insulating layer comprises a first insulating layer and a second insulating layer, the first insulating layer is arranged corresponding to the light-emitting unit, the first insulating layer is a top-wide and bottom-narrow structure, and the upper part of the first insulating layer is arranged away from the substrate; The second insulating layer is disposed around the first insulating layer, and the second insulating layer is in contact with the first insulating layer; The refractive index of the first insulating layer is greater than the refractive index of the second insulating layer; The insulating layer also includes: a third insulating layer, the third insulating layer comprising a first portion and a second portion, the first portion and the second portion being connected; The second portion is located between the light emitting device layer and the second insulating layer; the first portion is located on a side of the second insulating layer away from the first insulating layer; Or the third insulating layer includes a first portion, and the first portion is located on a side of the second insulating layer away from the first insulating layer.

2. The display panel according to claim 1, characterized in that: The second insulating layer is embedded in the third insulating layer.

3. The display panel according to claim 1, characterized in that: In the thickness direction of the display panel, a cross-sectional shape of the first insulating layer includes an inverted trapezoid.

4. The display panel according to claim 1, characterized in that: In the thickness direction of the display panel, the cross-sectional shape of the first insulating layer includes a combination of an inverted trapezoid and a rectangle, and the long side of the rectangle coincides with the lower base of the inverted trapezoid.

5. The display panel according to claim 1, characterized in that: In the thickness direction of the display panel, the cross-sectional shape of the second insulating layer includes a triangle, and the cross-sectional shape of the first insulating layer includes an inverted trapezoid or a combination of an inverted trapezoid and a rectangle, and the side length of the triangle close to the inverted trapezoid is equal to the waist of the inverted trapezoid.

6. The display panel according to claim 1 or 2, characterized in that: The first insulating layer comprises a transparent organic insulating layer or a transparent inorganic insulating layer; the second insulating layer comprises a transparent organic insulating layer or a transparent inorganic insulating layer; The third insulating layer includes a black organic insulating layer or a black inorganic insulating layer.

7. The display panel according to claim 1, characterized in that: Also includes: The encapsulation layer is located between the light emitting device layer and the insulating layer; the light emitting device layer includes an array layer located on a side of the light emitting unit close to the substrate.

8. The display panel according to claim 7, characterized in that: Also includes: A touch layer, located between the packaging layer and the insulating layer; The second insulating layer contacts the touch layer, or the insulating layer further includes a third insulating layer, and the second insulating layer and the touch layer are separated by a portion of the third insulating layer.

9. A display device, characterized in that: A display panel comprising any one of claims 1 to 8.

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