An OLED display panel

Abstract

An embodiment of the present application discloses an OLED display panel, comprising an array substrate; a pixel definition layer, disposed on a side surface of the array substrate, the pixel definition layer being provided with a plurality of pixel openings; a plurality of light-emitting units, disposed in the pixel openings; an encapsulation layer, disposed on the one side of the array substrate and covering the light-emitting units and the pixel definition layer; a plurality of grooves, the groove array being distributed on a side surface of the encapsulation layer away from the light-emitting units, a filling layer being provided in the grooves, the refractive index of the encapsulation layer being less than the refractive index of the filling layer; a color film layer, disposed on a side surface of the encapsulation layer away from the array substrate, comprising a plurality of filter units arranged corresponding to the light-emitting units and a shading structure surrounding the filter units.

Description

Technical Field

[0001] The present application relates to the field of OLEDs, and in particular to an OLED display panel. Background Art

[0002] With the advancement of technology and the iteration of consumer electronic products, users are paying more and more attention to the issue of privacy protection. In some cases, people do not want others to view the display screen on the display, which requires the display device to have an anti-peeping function to prevent other people within the viewing angle of the LCD display from viewing the screen content. The privacy display provides the target user with content readability at a protected viewing angle and reduces the visibility of content in off-axis positions to prevent peeping. Commonly used privacy displays cover the display screen with an anti-peep film, and there is a reduction in brightness due to its anti-peeping structure, which causes moiré patterns on the display, causing visual discomfort to the human eye.

[0003] For mobile phones, tablets, laptops, and car-mounted projects, there are technical requirements for anti-peeping display. Most of the existing anti-peeping display products are developed based on LCD technology. The switchable anti-peeping screens that have been mass-produced are mostly LCD laptop products. The switchable anti-peeping technology of OLED (organic light-emitting diode) / Mini and other technical categories is still to be developed. Summary of the invention

[0004] The embodiment of the present application provides an OLED display panel, which can solve the technical problem of poor anti-peeping effect of OLED display panels in the prior art.

[0005] An embodiment of the present application provides an OLED display panel, comprising an array substrate; a pixel definition layer, disposed on a side surface of the array substrate, the pixel definition layer being provided with a plurality of pixel openings; a plurality of light-emitting units, disposed in the pixel openings; an encapsulation layer, disposed on the one side of the array substrate and covering the light-emitting units and the pixel definition layer; a plurality of grooves, the groove array being distributed on a side surface of the encapsulation layer away from the light-emitting units, a filling layer being provided in the grooves, the refractive index of the encapsulation layer being less than the refractive index of the filling layer; a color film layer, disposed on a side surface of the encapsulation layer away from the array substrate, comprising a plurality of filter units arranged corresponding to the light-emitting units and a shading structure surrounding the filter units.

[0006] Optionally, in some embodiments of the present application, the thickness of the light-shielding structure is greater than the thickness of the light-filtering unit, and the difference between the thickness of the light-shielding structure and the thickness of the light-filtering unit is 4 μm to 8 μm.

[0007] Optionally, in some embodiments of the present application, the material of the pixel definition layer is consistent with the material of the light-shielding structure.

[0008] Optionally, in some embodiments of the present application, a lens is provided on a side of the filter unit away from the packaging layer, and a refractive index of the lens is greater than a refractive index of air.

[0009] Optionally, in some embodiments of the present application, the refractive index of the filling layer is smaller than the refractive index of the lens.

[0010] Optionally, in some embodiments of the present application, the material of the encapsulation layer is an organic resin material.

[0011] Optionally, in some embodiments of the present application, the material of the filling layer includes organic resin material and metal oxide nanoparticles.

[0012] Optionally, in some embodiments of the present application, the groove has an opening surface and a bottom surface opposite thereto, the opening surface is flush with a surface of the packaging layer on a side away from the light-emitting unit, and the projection of the bottom surface on the array substrate completely falls within the projection of the opening surface on the array substrate.

[0013] Optionally, in some embodiments of the present application, the pixel definition layer is a black barrier material.

[0014] Optionally, in some embodiments of the present application, the overlap rate of the projection of the filter unit on the array substrate and the projection of the light-emitting unit on the substrate is greater than 99%.

[0015] The beneficial effect of the embodiments of the present application lies in that a high-refractive-index lens is arranged inside the OLED display panel in the embodiments of the present application to change the propagation path of light, enhance the light at the front viewing angle of the OLED display panel, reduce the directional intensity within the side viewing angle range, i.e., the anti-peeping viewing angle range, enhance the anti-peeping effect, adopt a color film layer to replace the polarizer in the prior art, and further enhance the shielding effect of large-angle light by increasing the height of the shading structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 will be 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.

[0017] Figure 1 is a schematic diagram of the structure of an OLED display panel provided in an embodiment of the present application;

[0018] Figure 2 It is a structural schematic diagram of an OLED display panel provided in another preferred embodiment of the present application.

[0019] Description of reference numerals:

[0020] Array substrate 100; Pixel definition layer 200;

[0021] Light-emitting unit 300; Encapsulation layer 400;

[0022] Color filter layer 500; Pixel opening 210;

[0023] Light filtering unit 510; Light shielding structure 520;

[0024] Lens 530. DETAILED DESCRIPTION

[0025] 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 those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0026] The embodiment of the present application provides an OLED display panel, which is described in detail below.

[0027] Example

[0028] This embodiment is mainly used to explain the OLED display panel of the present application. The OLED display panel of the present application has the technical effect of preventing side-viewing and peeping. Specifically, Figure 1 As shown, the OLED display panel includes an array substrate 100 , a pixel definition layer 200 , a light emitting unit 300 , an encapsulation layer 400 and a color filter layer 500 .

[0029] A plurality of thin film transistor units are arranged at intervals inside the array substrate 100 to independently drive the light-emitting units 300 within a unit area of ​​the OLED display panel to light up or light down.

[0030] The pixel definition layer 200 is disposed on the array substrate 100 . A plurality of pixel openings 210 are formed on the pixel definition layer 200 to define the positions of the light emitting units 300 . The pixel openings 210 are used to provide channels for connecting the light emitting units 300 with the thin film transistor units.

[0031] In this embodiment, the pixel definition layer 200 is a black bank (blocking wall) material, and the thickness of the pixel definition layer 200 is greater than the thickness of the light-emitting unit 300, thereby effectively blocking the wide-angle light emitted by the light-emitting unit 300 without affecting the brightness of the normal-angle light. Within the anti-peeping viewing angle range (greater than 45°), the brightness of the OLED display panel is greatly reduced.

[0032] The light-emitting unit 300 is arranged in the pixel opening 210, and a functional layer (not shown in the figure) is provided on the upper and lower sides of the light-emitting unit 300 (with the direction facing the array substrate 100 as the lower side). The functional layer can excite the light unit 300 to emit light under the action of an electric field. The functional layer can be a common layer or can be separately provided corresponding to the light-emitting unit 300.

[0033] The encapsulation layer 400 is disposed on the array substrate 100, the pixel definition layer 200 and the light-emitting unit 300. The encapsulation layer 400 is a transparent organic resin material for isolating external water vapor impurities and supporting the color filter layer 500 so that a light transmission channel is provided between the color filter layer 500 and the light-emitting unit 300.

[0034] A plurality of grooves 410 are provided at intervals on one side of the encapsulation layer 400 away from the light-emitting unit 300, and the grooves 410 include an opening surface and a bottom surface opposite to each other, wherein the opening surface is flush with the surface of the side of the encapsulation layer 400 away from the light-emitting unit 300, and a filling layer 600 is provided in the groove 410, and the filling layer 600 is also made of a transparent organic resin material, but the difference is that metal oxide nanoparticles and monomers and polymers containing a high atomic number (compared with the carbon atomic number) are additionally added to the filling layer 600, so that the refractive index of the filling layer 600 is higher than that of the encapsulation layer 400. In the embodiment, the refractive index of the encapsulation layer 400 is 1-1.5, and the refractive index of the filling layer 600 is 1.6-1.75. Since the refractive index of the filling layer 600 is greater than the refractive index of the encapsulation layer 400, it is defined that the light enters the filling layer 600 at an incident angle a1 in the encapsulation layer 400, and the incident angle a2 of the light entering the filling layer 600 is (n1 / n2)*a1. Since n1 is less than n2, a2 ​​is less than a1, so the light will converge after entering the filling layer 600 from the encapsulation layer 400, thereby enhancing the brightness of the front viewing angle and reducing the brightness of the side viewing angle (anti-peeping viewing angle). In order to further enhance the convergence effect of the light, in this embodiment, the opening surface is larger than the size of the bottom surface, that is, the projection of the bottom surface on the array substrate 100 completely falls within the projection of the opening surface on the array substrate 100, so that the inner angle between the side wall of the groove 410 and the bottom surface is an obtuse angle, so that the normal line of the light entering the filling layer 600 tends to be upward.

[0035] The color filter layer 500 is arranged on a side surface of the packaging layer 400 away from the array substrate 100. The color filter layer 500 includes a filter unit 510 and a shading structure 520. The filter unit 510 is arranged in a one-to-one correspondence with the light-emitting unit 300, that is, the projection of the filter unit 510 on the array substrate 100 and the projection of the corresponding light-emitting unit 300 on the array substrate 100 have an overlap rate greater than 99%. Without considering the actual error, the overlap rate between the two is 100%.

[0036] By forming a color alignment scheme with the filter unit 510 and the light emitting unit 300, the angle of the light emitted by the light emitting unit 300 can be further limited, the side view light can be reduced, and the anti-peeping effect of the OLED display panel can be improved.

[0037] In order to further shield the side viewing angle light, in this embodiment, the height of the shading structure 520 is increased so that the height difference between it and the filter unit 510 reaches 4μm to 8μm. Specifically, the height of the filter unit 510 is 2.2μm to 3μm, and the height of the shading structure 520 is 6μm to 10μm. The higher the height of the shading structure 520, the stronger its ability to shield the side viewing angle light, and the better the light collection effect. Since the black matrix process of the prior art is difficult to achieve the height required by this embodiment, forcibly preparing a structure with the height requirement of this embodiment will also cause warping problems.

[0038] A lens 530 is provided on a side of the filter unit 510 away from the encapsulation layer 400, wherein the refractive index of the lens 530 is greater than that of the filling layer 600. In the present embodiment, the refractive index of the lens 530 is 1.7-1.9. As described above, when light passes through the filter unit 510 from the filling layer 600 and enters the lens 530, since the refractive index of the lens 530 is greater than that of the filling layer 600, the refraction angle of the light is further reduced, that is, the light is further converged toward the front of the OLED display panel, thereby further improving the front viewing angle brightness of the OLED display panel, and further eliminating the side viewing angle (anti-peeping viewing angle) light, thereby improving the anti-peeping effect of the OLED display panel.

[0039] like Figure 2 As shown, in another preferred embodiment of the present invention, the lens 530 is a convex lens. Although the refractive index of the lens 530 is greater than the refractive index of the air, since the surface on the side away from the filter unit 510 is a convex arc surface, when the light enters the air from the lens 530, there will be a certain divergence, and the divergence angle is not large and does not exceed the positive viewing angle range (no more than 45°), thereby ensuring the uniformity of the light within the positive viewing angle range.

[0040] The beneficial effect of this embodiment is that a high-refractive-index lens is arranged inside the OLED display panel of this embodiment to change the propagation path of light, enhance the light at the front viewing angle of the OLED display panel, reduce the directional intensity within the side viewing angle range, i.e., the anti-peeping viewing angle range, enhance the anti-peeping effect, adopt a color film layer to replace the polarizer of the prior art, and further enhance the shielding effect of large-angle light by increasing the height of the shading structure.

[0041] The above is a detailed introduction to an OLED display panel provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An OLED display panel, It is characterized in that include An array substrate; A pixel definition layer is disposed on a surface of one side of the array substrate, and a plurality of pixel openings are disposed on the pixel definition layer; A plurality of light-emitting units are disposed in the pixel openings; An encapsulation layer, disposed on the one side of the array substrate and covering the light-emitting unit and the pixel definition layer; A plurality of grooves, wherein the groove array is distributed on a surface of the packaging layer away from the light-emitting unit, a filling layer is arranged in the groove, and the refractive index of the packaging layer is smaller than the refractive index of the filling layer; A color filter layer is provided on a surface of the packaging layer away from the array substrate, and includes a plurality of filter units corresponding to the light-emitting units and a light shielding structure surrounding the filter units; Projected in a direction perpendicular to the array substrate, a portion of the projection of the grooves is located within the projection of the light shielding structure, a portion of the projection of the grooves is located within the projection of the filter unit, and a portion of the projection of the remaining grooves is located within the projection of the light shielding structure, and another portion is located within the projection of the filter unit; The thickness of the light shielding structure is greater than the thickness of the light filtering unit, and the difference between the thickness of the light shielding structure and the thickness of the light filtering unit is 4 μm to 8 μm.

2. The OLED display panel according to claim 1, It is characterized in that The material of the pixel definition layer is consistent with the material of the light shielding structure.

3. The OLED display panel according to claim 1, It is characterized in that A lens is disposed on a side of the filter unit away from the packaging layer, and the refractive index of the lens is greater than the refractive index of air.

4. The OLED display panel according to claim 3, It is characterized in that The refractive index of the filling layer is smaller than the refractive index of the lens.

5. The OLED display panel according to claim 1, It is characterized in that The material of the encapsulation layer is an organic resin material.

6. The OLED display panel according to claim 1, It is characterized in that The material of the filling layer includes organic resin material and metal oxide nanoparticles.

7. The OLED display panel according to claim 1, It is characterized in that The groove has an opening surface and a bottom surface opposite thereto, the opening surface is flush with a surface of the packaging layer away from the light-emitting unit, and a projection of the bottom surface on the array substrate completely falls within a projection of the opening surface on the array substrate.

8. The OLED display panel according to claim 1, It is characterized in that The pixel definition layer is a black barrier material.

9. The OLED display panel according to claim 1, It is characterized in that The overlap rate between the projection of the filter unit on the array substrate and the projection of the light emitting unit on the substrate is greater than 99%.

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