Display panel and display device

Abstract

The present application relates to a display panel, comprising a substrate and an optical sensor on the substrate, the optical sensor is used for receiving fingerprint reflected light and photoelectric conversion, further comprising a lens assembly on the light-in side of the optical sensor, the lens assembly is located on the path of the fingerprint reflected light, used for converging the fingerprint reflected light towards the direction of the optical sensor. The present application also relates to a display device.

Description

Technical Field

[0001] This invention relates to the field of display product manufacturing technology, and more particularly to a display device. Background Technology

[0002] With the continuous development of full-screen technology, the proportion of the display area in the display panel is constantly increasing. Integrating the fingerprint recognition area into the display panel has become a trend to improve the screen-to-body ratio and achieve a full-screen display. However, in current technologies, designs that integrate fingerprint recognition into the display panel often suffer from insufficient fingerprint recognition accuracy, failing to recognize the user's fingerprint. Therefore, improving the accuracy of fingerprint recognition within the display panel has become an urgent problem to be solved. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention provides a display panel and a display device that solve the problem of low fingerprint recognition accuracy.

[0004] To achieve the above objectives, the technical solution adopted in this embodiment of the invention is: a display panel, including a substrate and an optical sensor located on the substrate, the optical sensor being used to receive fingerprint reflected light and perform photoelectric conversion, and further including a lens assembly located on the light-incident side of the optical sensor, the lens assembly being located on the path of the fingerprint reflected light and being used to converge the fingerprint reflected light toward the optical sensor.

[0005] Optionally, the orthographic projection of the optical sensor on the substrate is located within the orthographic projection of the lens assembly on the substrate.

[0006] Optionally, an optical adhesive layer is provided on the light-incident side of the optical sensor, and the lens assembly is formed on the optical adhesive layer.

[0007] Optionally, a light-shielding layer is provided on the light-incident side of the optical sensor, and an opening area is provided on the light-shielding layer. A color filter layer is formed in the opening area. The opening area includes a first opening corresponding to the optical sensor. In a direction perpendicular to the substrate, the optical adhesive layer includes a first sub-optical adhesive layer and a second sub-optical adhesive layer located on opposite sides of the light-shielding layer. The lens assembly is formed in the first opening.

[0008] Optionally, the first sub-optical adhesive layer is located on the side of the light-shielding layer away from the optical sensor, and the second sub-optical adhesive layer is located on the side of the light-shielding layer closer to the optical sensor;

[0009] The lens assembly includes a first condenser lens formed on the first sub-optical adhesive layer and a second condenser lens formed on the second sub-optical adhesive layer.

[0010] Optionally, the refractive index of the first sub-optical adhesive layer is greater than the refractive index of the second sub-optical adhesive layer.

[0011] Optionally, the first condenser lens is a convex lens formed by the first sub-optical adhesive layer protruding away from the optical sensor, and the second condenser lens is a convex lens formed by the first sub-optical adhesive layer protruding towards the optical sensor.

[0012] Optionally, the main optical axis of the first condenser lens and the main optical axis of the second condenser lens are coaxially arranged.

[0013] Optionally, the first condenser lens is a convex lens formed by the first sub-optical adhesive layer protruding in a direction away from the optical sensor, and the second condenser lens is formed by the first sub-optical adhesive layer protruding in a direction closer to the optical sensor. The cross-section of the second condenser lens in the direction perpendicular to the substrate is trapezoidal, and the length of the first side of the trapezoid close to the first condenser lens is less than the length of the second side of the trapezoid away from the first condenser lens.

[0014] Optionally, the second lens has an isosceles trapezoidal cross-section in the direction perpendicular to the substrate.

[0015] Optionally, the display panel is a touch display panel, and a touch electrode layer is disposed between the light-shielding layer and the optical sensor. A light-transmitting area is disposed on the touch electrode layer, and the orthographic projection of the light-transmitting area on the substrate is located within the orthographic projection of the first opening on the substrate.

[0016] This invention also provides a display device, including the display panel described above.

[0017] The beneficial effects of the present invention are: by setting the lens assembly to converge the fingerprint reflected light toward the receiving surface of the optical sensor, the amount of light reaching the receiving surface of the optical sensor can be increased, thereby improving the clarity of the formed optical fingerprint pattern; and thus improving the fingerprint recognition accuracy. Attached Figure Description

[0018] Figure 1 This diagram illustrates the structure of the display panel in an embodiment of the present invention. Figure 1 ;

[0019] Figure 2 This diagram illustrates the structure of the display panel in an embodiment of the present invention. Figure 2 ;

[0020] Figure 3 This is a schematic diagram showing the structure of the first focusing lens in an embodiment of the present invention;

[0021] Figure 4This diagram illustrates the structure of the second focusing lens in an embodiment of the present invention. Figure 1 ;

[0022] Figure 5 This diagram illustrates the structure of the second focusing lens in an embodiment of the present invention. Figure 2 ;

[0023] Figure 6 A schematic diagram showing the collimation structure in related technologies. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In current optical fingerprint recognition solutions, when the optical sensor is integrated on the array substrate, the distance between it and the finger contact surface is relatively large. This causes some of the light reflected back by the finger to be scattered and unable to reach the optical sensor. As a result, the optical sensor receives less light, making the formed optical fingerprint pattern blurry, which in turn affects the fingerprint recognition accuracy.

[0027] refer to Figures 1-5 To address the aforementioned issues, this embodiment provides a display panel, including a substrate and an optical sensor 10 located on the substrate. The optical sensor 10 is used to receive fingerprint reflected light and perform photoelectric conversion. The panel also includes a lens assembly 1 located on the light-incident side of the optical sensor 10. The lens assembly 1 is located on the path of the fingerprint reflected light and is used to converge the fingerprint reflected light toward the optical sensor 10.

[0028] The optical sensor 10 includes a receiving surface for receiving fingerprint reflected light. By setting the lens assembly 1 to converge the fingerprint reflected light toward the receiving surface of the optical sensor 10, the amount of light reaching the receiving surface of the optical sensor 10 can be increased, thereby improving the clarity of the formed optical fingerprint pattern; and thus improving the fingerprint recognition accuracy.

[0029] In an exemplary embodiment, the orthographic projection of the optical sensor 10 onto the substrate is located within the orthographic projection of the lens assembly 1 onto the substrate.

[0030] The lens assembly 1 is located directly above the optical sensor 10, which facilitates the incident light reflected from the fingerprint onto the optical sensor 10.

[0031] In an exemplary embodiment, an optical adhesive layer is provided on the light-incident side of the optical sensor 10, and the lens assembly 1 is formed on the optical adhesive layer, but this is not a limitation.

[0032] In an exemplary embodiment, a light-shielding layer 4 is provided on the light-incident side of the optical sensor 10. An opening area is provided on the light-shielding layer 4, and a color filter layer is formed in the opening area. The opening area includes a first opening corresponding to the optical sensor 10. In a direction perpendicular to the substrate, the optical adhesive layer includes a first sub-optical adhesive layer 2 and a second sub-optical adhesive layer 3 located on opposite sides of the light-shielding layer 4. The lens assembly 1 is formed in the first opening.

[0033] The orthographic projection of the optical sensor 10 onto the substrate lies within the orthographic projection of the first opening onto the substrate. The first opening serves to transmit light, and the lens assembly 1 is positioned within the first opening to focus the light.

[0034] In an exemplary embodiment, the first sub-optical adhesive layer 2 is located on the side of the light-shielding layer 4 away from the optical sensor 10, and the second sub-optical adhesive layer 3 is located on the side of the light-shielding layer 4 close to the optical sensor 10.

[0035] The lens assembly 1 includes a first condenser lens 11 formed on the first sub-optical adhesive layer 2 and a second condenser lens 12 formed on the second sub-optical adhesive layer 3.

[0036] The first focusing lens 11 and the second focusing lens work together to double focus the light, increasing the amount of light entering the optical sensor 10.

[0037] For example, the orthographic projection of the first opening on the substrate lies within the orthographic projection of the first condenser lens 11 on the substrate. (Reference) Figure 1 and Figure 2The area of ​​the first opening projected onto the substrate is smaller than the area of ​​the first condenser lens 11 projected onto the substrate. This facilitates the first condenser lens 11 in receiving fingerprint reflected light and blocks the entry of large-angle light.

[0038] In an exemplary embodiment, the refractive index of the first sub-optical adhesive layer 2 is greater than the refractive index of the second sub-optical adhesive layer 3.

[0039] refer to Figure 3 According to the optical principle n1θ1=n2θ2, when light enters a high-refractive-index material from a low-refractive-index material, total refraction occurs. To achieve a focusing effect, i.e. θ1>θ2, n1<n2 is required. Forming a convex lens can improve the focusing effect of light.

[0040] It should be noted that an optical film layer (e.g., a polarizer) and a cover plate are also provided on the side of the light-shielding layer 4 away from the substrate. In order to achieve the function of focusing light, the refractive index of the first sub-optical adhesive layer 2 is greater than the refractive index of the optical film layer (which is disposed adjacent to the first sub-optical adhesive layer 2) or the cover plate located on the side of the first sub-optical adhesive layer 2 away from the substrate.

[0041] refer to Figure 4 Similarly, when light enters the second sub-optical adhesive layer 3 from the first sub-optical adhesive layer 2, if a light-focusing effect is to be achieved, i.e., θ1 < θ2, then n1 > n2 is required (i.e., the refractive index of the first sub-optical adhesive layer 2 is greater than the refractive index of the second sub-optical adhesive layer 3).

[0042] In an exemplary embodiment, the first condenser lens 11 is a convex lens formed by the first sub-optical adhesive layer 2 protruding in a direction away from the optical sensor 10, and the second condenser lens 12 is a convex lens formed by the first sub-optical adhesive layer 2 protruding in a direction closer to the optical sensor 10.

[0043] A convex lens can be formed to achieve a light-focusing effect.

[0044] In an exemplary embodiment, the main optical axis of the first condenser lens 11 and the main optical axis of the second condenser lens 12 are coaxially arranged.

[0045] In an exemplary embodiment, the first condenser lens 11 is a convex lens formed by the first sub-optical adhesive layer 2 protruding in a direction away from the optical sensor 10, and the second condenser lens 12 is formed by the first sub-optical adhesive layer 2 protruding in a direction close to the optical sensor 10. The cross-section of the second condenser lens 12 in the direction perpendicular to the substrate is trapezoidal, and the length of the first side of the trapezoid close to the first condenser lens is less than the length of the second side of the trapezoid away from the first condenser lens.

[0046] Total internal reflection (TIR) ​​is an optical phenomenon. When light enters a medium with a higher refractive index (n1) from a medium with a lower refractive index (n2), if the angle of incidence is greater than a certain critical angle θc (when the light ray moves away from the normal), the refracted ray will disappear, and all incident rays will be reflected and will not enter the medium with the lower refractive index.

[0047] Critical angle equation:

[0048]

[0049] refer to Figure 5 Since the refractive index of the first sub-optical adhesive layer 2 is greater than that of the second sub-optical adhesive layer 3, the second condenser lens 12 is formed by protruding from the first sub-optical adhesive layer 2 towards the optical sensor 10. Specifically, the second sub-optical adhesive layer 3 has an opening area, and the first sub-optical adhesive layer 2 has a protrusion filling the opening area to form the second condenser lens 12. The light rays emitted from the second condenser lens 12 (i.e., the light rays emitted from the first sub-optical adhesive layer 2) first enter the second sub-optical adhesive layer. The cross-section of the second condenser lens 12 in the direction perpendicular to the substrate is trapezoidal. The light rays incident into the second condenser lens 12 undergo total internal reflection on the side of the second condenser lens 12, and then exit through the side of the second condenser lens 12 toward the optical sensor 10 and enter the second sub-optical adhesive layer 3, thereby achieving the function of light convergence.

[0050] In an exemplary embodiment, the second condenser lens 12 has an isosceles trapezoidal cross-section in the direction perpendicular to the substrate. This facilitates the convergence of all light rays towards the center of the optical sensor 10.

[0051] In an exemplary embodiment, the display panel is a touch display panel, a touch electrode layer 8 is disposed between the light-shielding layer 4 and the optical sensor 10, a light-transmitting area 9 is disposed on the touch electrode layer 8, and the orthographic projection of the light-transmitting area 9 on the substrate is located within the orthographic projection of the first opening on the substrate.

[0052] The light-transmitting area 9 and the first opening cooperate to form a collimation structure, which collimates and filters the diffuse light at a single pixel in the image to form collimated light or near-collimated light in the normal direction.

[0053] refer to Figure 6In related technologies, to ensure that only small-angle fingerprint reflected light is incident on the optical sensor 10 while shielding various stray lights at large angles, the collimation layer 100 in traditional collimator solutions is quite thick. This thickness is difficult to manufacture and integrate into the panel. To solve this problem, in this embodiment, a collimation structure is formed by the cooperation of the light-transmitting area 9 and the first opening (utilizing the distance between the first opening and the light-transmitting area 9, as well as the dimensions of the first opening and the light-transmitting area 9). This collimates and filters the diffuse light at a single pixel of the image, forming a normal collimated light or near-collimated light (signal) that can be smoothly transmitted to the corresponding photodetector. This solution allows more light to reach the photodetector, thereby enhancing the signal-to-noise ratio.

[0054] Furthermore, the collimation structure is formed by the light-transmitting area 9 and the first opening. The collimator is prepared by utilizing the original manufacturing process of the display panel, which has the advantages of simple process and low cost.

[0055] For example, the orthographic projection of the light-transmitting area 9 on the substrate completely coincides with the orthographic projection of the first opening on the substrate, but this is not a limitation.

[0056] For example, the light-emitting side of the optical sensor 10 is provided with an encapsulation layer 5, and a buffer layer 7 is provided on the side of the encapsulation layer 5 away from the substrate. The touch electrode layer 8 is formed on the side of the buffer layer 7 away from the substrate. An insulating layer 6 is provided on the side of the touch electrode layer 8 away from the substrate. The second sub-optical adhesive layer 3, the light-shielding layer 4, and the first sub-light-shielding adhesive layer are stacked sequentially on the side of the insulating layer 6 away from the substrate. That is, the second sub-optical adhesive layer 3 and the insulating layer 6 are provided between the first opening and the light-transmitting area 9 to ensure the spacing between the first opening and the light-transmitting area 9. The formation of this spacing utilizes the original structure of the display panel and does not increase the thickness of the display panel.

[0057] In an exemplary embodiment, the optical sensor 10 employs a photodiode, including a photoconversion layer and electrode layers located on opposite sides of the photoconversion layer.

[0058] This invention also provides a display device, including the display panel described above.

[0059] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display panel, comprising a substrate and an optical sensor located on the substrate, the optical sensor being used to receive light reflected from a fingerprint and perform photoelectric conversion, characterized in that, It also includes a lens assembly located on the light-incident side of the optical sensor, the lens assembly being located on the path of the fingerprint reflected light and used to converge the fingerprint reflected light toward the optical sensor; An optical adhesive layer is provided on the light-incident side of the optical sensor, and the lens assembly is formed on the optical adhesive layer; The optical sensor has a light-shielding layer on its light-incident side, and an opening area is provided on the light-shielding layer. A color filter layer is formed in the opening area. The opening area includes a first opening corresponding to the optical sensor. In a direction perpendicular to the substrate, the optical adhesive layer includes a first sub-optical adhesive layer and a second sub-optical adhesive layer located on opposite sides of the light-shielding layer. The lens assembly is formed in the first opening. A touch electrode layer is disposed between the light-shielding layer and the optical sensor. A light-transmitting area is disposed on the touch electrode layer. The orthographic projection of the light-transmitting area on the substrate is located within the orthographic projection of the first opening on the substrate. The first sub-optical adhesive layer is located on the side of the light-shielding layer away from the optical sensor, and the second sub-optical adhesive layer is located on the side of the light-shielding layer closer to the optical sensor; The lens assembly includes a first condensing lens formed on the first sub-optical adhesive layer and a second condensing lens formed on the second sub-optical adhesive layer; The first condenser lens is a convex lens formed by the first sub-optical adhesive layer protruding in a direction away from the optical sensor. The second condenser lens is formed by the first sub-optical adhesive layer protruding in a direction closer to the optical sensor. The cross-section of the second condenser lens in the direction perpendicular to the substrate is trapezoidal, and the length of the first side of the trapezoid close to the first condenser lens is less than the length of the second side of the trapezoid away from the first condenser lens.

2. The display panel according to claim 1, characterized in that, The orthographic projection of the optical sensor onto the substrate lies within the orthographic projection of the lens assembly onto the substrate.

3. The display panel according to claim 1, characterized in that, The refractive index of the first sub-optical adhesive layer is greater than that of the second sub-optical adhesive layer.

4. The display panel according to claim 1, characterized in that, The first condenser lens is a convex lens formed by the first sub-optical adhesive layer protruding away from the optical sensor, and the second condenser lens is a convex lens formed by the first sub-optical adhesive layer protruding towards the optical sensor.

5. The display panel according to claim 4, characterized in that, The main optical axis of the first condenser lens and the main optical axis of the second condenser lens are coaxially arranged.

6. The display panel according to claim 1, characterized in that, The second focusing lens has an isosceles trapezoidal cross section in the direction perpendicular to the substrate.

7. A display device, characterized in that, Includes the display panel as described in any one of claims 1-6.

Images