A display panel and display device

Abstract

The application discloses a display panel and a display device to improve the problems of the prior art display panel, such as light leakage, the decline of fingerprint recognition performance caused by the contact of the attached light shielding tape with the ultrasonic fingerprint recognition component and the shielding of ultrasonic signal emission, and the problem of the thick display panel which is not conducive to the overall assembly. The display panel comprises a display component and an ultrasonic fingerprint recognition component located on the backlight side of the display component; wherein a light shielding layer is arranged between the display component and the ultrasonic fingerprint recognition component, and the orthographic projection of the display component covers the orthographic projection of the ultrasonic fingerprint recognition component on the display component.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of semiconductor, in particular to a display panel and a display device. BACKGROUND

[0002] With the development of science and technology, organic electroluminescence display (OLED) and ultrasonic fingerprint recognition technology are also more and more mature. At present, OLED has more and more wide application in various industries due to its characteristics of lightness, high brightness, low power consumption, fast response, high definition, good flexibility and high luminous efficiency. At the same time, as the third generation of fingerprint recognition technology, ultrasonic fingerprint has strong environmental adaptability, and is less affected by finger dirt, grease and water stains. Even in the case of water and dirt on the finger, it can accurately identify the user's fingerprint, and has a better recognition rate. However, the application of ultrasonic fingerprint technology on OLED products still has many problems to be solved. For example, the current ultrasonic fingerprint technology exists in OLED products. The light shielding tape will contact the ultrasonic fingerprint recognition component, which will affect the recognition performance.

[0003] The display panel of the prior art has the problems of light leakage when the ultrasonic fingerprint recognition component is attached, and the light shielding tape attached will contact the ultrasonic fingerprint recognition component, block the ultrasonic signal emission and cause the fingerprint recognition performance to decrease, the overall display panel is thick, and is not conducive to the assembly of the whole machine. SUMMARY

[0004] The present application provides a display panel and a display device to improve the problems of light leakage in the display panel of the prior art, and the light shielding tape attached will contact the ultrasonic fingerprint recognition component, block the ultrasonic signal emission and cause the fingerprint recognition performance to decrease, the overall display panel is thick, and is not conducive to the assembly of the whole machine.

[0005] The present application provides a display panel and a display device to improve the problems of light leakage in the display panel of the prior art, and the light shielding tape attached will contact the ultrasonic fingerprint recognition component, block the ultrasonic signal emission and cause the fingerprint recognition performance to decrease, the overall display panel is thick, and is not conducive to the assembly of the whole machine.

[0006] In a possible implementation, the ultrasonic fingerprint recognition component and the display component have a first adhesive layer therebetween;

[0007] The light shielding layer is located between the first adhesive layer and the display component.

[0008] In a possible implementation, the display component includes a back film and a functional layer located on a side of the back film away from the ultrasonic fingerprint recognition component;

[0009] The back film comprises a substrate and a second adhesive layer on the side of the substrate facing the functional layer, and the second adhesive layer and / or the substrate are multiplexed as the light shielding layer.

[0010] In a possible implementation, the display assembly comprises a flexible substrate, and the flexible substrate comprises a plurality of layers; the light shielding layer is located between any two of the layers.

[0011] In a possible implementation, the display panel further comprises a heat dissipation film on the side of the light shielding layer away from the display assembly; the heat dissipation film has a hollow area, and a projection of the hollow area on the display assembly covers a projection of the ultrasonic fingerprint identification assembly on the display assembly.

[0012] The light shielding layer covers the projection of the hollow area on the display assembly.

[0013] In a possible implementation, the projection of the light shielding layer on the display assembly and the projection of the heat dissipation film on the display assembly have an overlapping area.

[0014] In a possible implementation, in a direction from the hollow area to the heat dissipation film, the width of the overlapping area is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0015] In a possible implementation, the material of the light shielding layer comprises ink, carbon black, and / or silver.

[0016] In a possible implementation, the thickness of the light shielding layer is greater than zero and less than or equal to 3 μm.

[0017] The display panel provided in the embodiments of the present disclosure can be applied to a display device.

[0018] The display assembly 1 and the ultrasonic fingerprint identification assembly 2 are provided with the light shielding layer 6, the projection of the light shielding layer 6 on the display assembly 1 covers the projection of the ultrasonic fingerprint identification assembly 2 on the display assembly 1, and thus the opening area of the ultrasonic fingerprint identification assembly 2 can be shielded, and the light leakage problem at the ultrasonic fingerprint identification assembly 2 can be improved. Moreover, the display panel does not need to be attached with a light shielding tape, and thus the problems in the prior art, such as the light shielding tape contacting the ultrasonic fingerprint identification assembly, shielding ultrasonic signal emission, and causing fingerprint identification performance to decrease, and the light shielding tape causing the overall display panel to be thick and being not conducive to the assembly of the whole machine, can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A cross-sectional view of a display panel of the related art is shown in FIG. 1.

[0020] Figure 2 A schematic diagram of light leakage in a display panel of the related art is shown in FIG. 2.

[0021] Figure 3 A schematic diagram of an ultrasonic wave propagation path in a display panel of the related art is shown in FIG. 3.

[0022] Figure 4 A cross-sectional view of a display panel according to an embodiment of the present disclosure is shown in FIG. 4.

[0023] Figure 5 A cross-sectional view of a display panel according to another embodiment of the present disclosure is shown in FIG. 5.

[0024] Figure 6 A cross-sectional view of a display panel according to another embodiment of the present disclosure is shown in FIG. 6. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present disclosure.

[0026] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the ordinary meaning commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms “first”, “second” and similar terms used in the present disclosure do not denote any order, quantity or importance, but are used to distinguish different components. The terms “include” or “contain” and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms “connect” or “connected” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper”, “lower”, “left”, “right” and the like are used only to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0027] As used herein, "about" or "approximately" includes the stated value and means within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art to be within the scope of what is claimed in view of the measurements discussed and the error in measuring the particular quantity (i.e., the limitations of the measurement system). For example, "approximately" can mean that the difference with respect to a stated value is within one or more standard deviations, or within ± 30%, 20%, 10%, 5%.

[0028] In the drawings, the thicknesses of layers, films, panels, regions, etc., can be exaggerated for clarity. Exemplary embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, embodiments described herein are not to be construed as being limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an area illustrated or described as flat can typically have rough and / or nonlinear features. Moreover, sharp angles that are illustrated can be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.

[0029] In order to keep the following description of the embodiments of the present disclosure clear and concise, the detailed description of known functions and known components will be omitted.

[0030] In the related product design, in combination with Figure 1 As shown, the ultrasonic fingerprint identification assembly 02 is attached to the backlight side of the OLED display assembly 01 by the adhesive tape 03, and a heat dissipation film 05 needs to be attached to the backlight side of the display assembly 01. Since the heat dissipation film 05 contains a metal layer, it affects the normal work of the ultrasonic fingerprint identification assembly 02. In order to attach the ultrasonic fingerprint identification assembly 02 (the periphery of the ultrasonic fingerprint identification assembly 02 can be provided with an edge sealing glue 04), the heat dissipation film 05 on the back of the display assembly 01 is often designed with an opening. Considering the shape and attachment tolerance of the adhesive tape 03 and the ultrasonic fingerprint identification assembly 02, the opening of the heat dissipation film 05 is often much larger than the boundary of the ultrasonic fingerprint identification assembly 02, which will cause light leakage problems, affecting the integrated black effect of the product. At the same time, limited by the client's overall machine design, the space above the heat dissipation film 05 is limited, and there is only a small space or no space for light shielding tape attachment, which will cause light leakage problems (such as Figure 2There is a risk of scratches to the OLED display component 01. If light-shielding tape 06 is applied to the entire opening area, since the thickness of the heat dissipation film 05 ranges from 0.18mm to 0.3mm, and the overall thickness of the ultrasonic fingerprint recognition component 02 and the adhesive tape 03 is 0.15mm, with a height difference of 0.03mm to 0.15mm, the light-shielding tape 06 will inevitably collapse due to its own weight or contact with foreign objects, coming into contact with the back of the ultrasonic fingerprint recognition component 02. Similarly, after the entire device is assembled, since the OLED display component 01 is exposed here, there will be display abnormalities in the display area. In addition, if... Figure 3 As shown, in actual operation, the ultrasonic fingerprint recognition component 02 generates and emits ultrasonic signals from the sensing layer 022 (TRX layer), simultaneously emitting them to both sides. The ultrasonic signals heading towards the non-adhesive surface are reflected at the air-contact surface, and the air layer provides a good reflective imaging background. If there is local contact with other materials (such as the light-shielding tape 06), it will affect the imaging background of the ultrasonic fingerprint recognition component 02, thus affecting its recognition performance. Furthermore, due to the thickness requirements of the light-shielding tape 06, the customer needs to ensure the entire device is properly positioned to avoid it.

[0031] See Figures 4-6 As shown, an embodiment of the present invention provides a display panel, including: a display component 1, and an ultrasonic fingerprint recognition component 2 located on the backlight side of the display component 1; wherein, a light-shielding layer 6 is disposed between the display component 1 and the ultrasonic fingerprint recognition component 2, and the orthographic projection of the light-shielding layer 6 on the display component 1 covers the orthographic projection of the ultrasonic fingerprint recognition component 2 on the display component 1.

[0032] In this embodiment of the invention, a light-shielding layer 6 is provided between the display component 1 and the ultrasonic fingerprint recognition component 2. The orthographic projection of the light-shielding layer 6 onto the display component 1 covers the orthographic projection of the ultrasonic fingerprint recognition component 2 onto the display component 1, thereby blocking the opening area where the ultrasonic fingerprint recognition component 2 is located, improving the light leakage problem at the ultrasonic fingerprint recognition component 2. Moreover, the display panel does not need to be attached with light-shielding tape, which can improve the problems of the prior art where the attached light-shielding tape will contact the ultrasonic fingerprint recognition component and block the ultrasonic signal emission, resulting in a decrease in fingerprint recognition performance, and the light-shielding tape will make the overall display panel thicker, which is not conducive to the assembly of the whole machine.

[0033] In one possible implementation, see Figure 4 As shown, a first adhesive layer 3 is provided between the ultrasonic fingerprint recognition component 2 and the display component 1; a light-shielding layer 6 is located between the first adhesive layer 3 and the display component 1. In this embodiment of the invention, a light-shielding layer 6 is provided between the first adhesive layer 3 and the display component 1, which makes the light-shielding method of the display component 1 in the ultrasonic fingerprint recognition opening area simple and easy to implement.

[0034] Specifically, the first adhesive layer 3 can be an adhesive tape for bonding the ultrasonic fingerprint identification assembly 2 and the display assembly 1. Specifically, the ultrasonic fingerprint identification assembly 2 can be provided with an edge sealing glue 4.

[0035] Specifically, in combination with Figure 4 As shown, the light shielding layer 6 can be black ink. Specifically, the black ink can be coated as the light shielding layer 6 only in the opening area where the ultrasonic fingerprint identification assembly 2 is located. Correspondingly, the black ink can also be coated on the OLED backlight surface to avoid the air bubble problem caused by the SCF absorption step difference.

[0036] In a possible implementation, referring to Figure 5 or Figure 6 As shown, the display assembly 1 includes a back film 12 and a functional layer 11 located on a side of the back film 12 away from the ultrasonic fingerprint identification assembly 2; the back film 12 includes a substrate 121 and a second adhesive layer 122 located on a side of the substrate 121 facing the functional layer 11, and the second adhesive layer 122 and / or the substrate 121 are multiplexed as the light shielding layer 6. In the embodiment of the present disclosure, the second adhesive layer 122 and / or the substrate 121 are multiplexed as the light shielding layer 6, which can play a light shielding effect while not increasing the thickness of the display panel, and is conducive to the thinning of the display panel.

[0037] It should be noted that Figure 5 The above is only a schematic description of multiplexing the second adhesive layer 122 as the light shielding layer 6, and in actual implementation, the substrate 121 can also be multiplexed as the light shielding layer 6, or the second adhesive layer 122 and the substrate 121 can both be multiplexed as the light shielding layer 6.

[0038] Specifically, the ink or carbon black can be uniformly distributed in the second adhesive layer 122 to play a light shielding role, and at the same time, the substrate 121 can also be replaced by a black opaque material to also play a light shielding role.

[0039] In a possible implementation, referring to Figure 6 As shown, the display assembly 1 includes a flexible substrate 13, and the flexible substrate 13 includes a plurality of layers 131; the light shielding layer 6 is located between any two layers 131. Specifically, for example, as shown in Figure 6 As shown, the flexible substrate 13 includes three layers 131, which are a first sub-flexible substrate 1311, a second sub-flexible substrate 1312, and a barrier layer 1310 located between the first sub-flexible substrate 1311 and the second sub-flexible substrate 1312. Specifically, the light shielding layer 6 can be located between the first sub-flexible substrate 1311 and the barrier layer 1310; specifically, the light shielding layer 6 can also be located between the barrier layer 1310 and the second sub-flexible substrate 1312. In the embodiment of the present disclosure, the light shielding layer 6 is added between any two layers of the flexible substrate 13, which can also achieve light shielding of the opening area where the ultrasonic fingerprint identification assembly 2 is located without the need to attach a light shielding adhesive tape.

[0040] Specifically, as shown in Figure 6 The light shielding layer 6 can also be black ink, and the light shielding layer 6 can be formed by coating. After the black ink coating is completed, the ink area can be leveled by the flow filling property when the first sub-flexible substrate 1311 is formed.

[0041] Specifically, as shown in Figure 5 And Figure 6 In a possible implementation, the flexible substrate 13 can be located between the back film 12 and the functional layer 11.

[0042] In a possible implementation, as shown in Figures 4-6 The display panel further includes a heat dissipation film 5 located on the side of the light shielding layer 6 away from the display assembly 1. The heat dissipation film 5 has a hollow area 50, and the orthogonal projection of the hollow area 50 on the display assembly 1 covers the orthogonal projection of the ultrasonic fingerprint identification assembly 2 on the display assembly 1. The orthogonal projection of the light shielding layer 6 on the display assembly 1 covers the orthogonal projection of the hollow area 50 on the display assembly 1, thereby achieving complete shielding of the hollow area 50.

[0043] In a possible implementation, as shown in Figure 4 The orthogonal projection of the light shielding layer 6 on the display assembly 1 and the orthogonal projection of the heat dissipation film 5 on the display assembly 1 have an overlapping area S.

[0044] In a possible implementation, as shown in Figure 4 Or Figure 6 In the direction from the hollow area 50 to the heat dissipation film 5, the width d of the overlapping area S is greater than or equal to 0.5 mm and less than or equal to 1 mm. In the embodiment of the present application, the size of the ink area needs to comprehensively consider the fitting tolerance of the heat dissipation film 5, the hole size tolerance, and the ink coating tolerance. Generally, the ink coating area needs to be extended outward by more than 0.5 mm relative to the hollow area 50 of the heat dissipation film 5.

[0045] In a possible implementation, the material of the light shielding layer 6 can include ink, carbon black, and / or silver.

[0046] In a possible implementation, as shown in Figure 4 The thickness h of the light shielding layer 6 can be greater than zero and less than or equal to 3 μm. In the embodiment of the present application, the thickness of the light shielding layer 6 is controlled to be less than 3 μm, so as to ensure a relatively thin thickness and facilitate the film layer in the heat dissipation film 5 to absorb the relevant step difference.

[0047] The embodiment of the present application also provides a display device including the display panel provided by the embodiment of the present application.

[0048] The embodiment of the present application has the following beneficial effects: in the embodiment of the present application, the light shielding layer 6 is arranged between the display assembly 1 and the ultrasonic fingerprint identification assembly 2, the normal projection of the display assembly 1 covers the normal projection of the ultrasonic fingerprint identification assembly 2, and the opening area where the ultrasonic fingerprint identification assembly 2 is located can be shielded, the light leakage problem at the ultrasonic fingerprint identification assembly 2 is improved, the display panel does not need to be attached with a light shielding tape, and the problems that the light shielding tape contacts the ultrasonic fingerprint identification assembly, the fingerprint identification performance is reduced due to the shielding of ultrasonic signal emission, and the overall display panel is thick and is not conducive to the assembly of the whole machine can be improved.

[0049] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A display panel, characterized by, The display panel comprises: a display assembly and an ultrasonic fingerprint identification assembly located at the backlight side of the display assembly; wherein an optical shielding layer is arranged between the display assembly and the ultrasonic fingerprint identification assembly, and a projection of the optical shielding layer on the display assembly covers a projection of the ultrasonic fingerprint identification assembly on the display assembly. The display assembly comprises a flexible substrate, and the flexible substrate comprises a plurality of layers; the optical shielding layer is located between any two layers.

2. The display panel of claim 1, wherein, The ultrasonic fingerprint identification assembly and the display assembly have a first adhesive layer therebetween. The optical shielding layer is located between the first adhesive layer and the display assembly.

3. The display panel of claim 1, wherein, The display assembly comprises a back film and a functional layer located on a side of the back film away from the ultrasonic fingerprint identification assembly. The back film comprises a substrate and a second adhesive layer located on a side of the substrate facing the functional layer, and the second adhesive layer and / or the substrate are multiplexed as the optical shielding layer.

4. The display panel of any one of claims 1-3, wherein, The display panel further comprises a heat dissipation film located on a side of the optical shielding layer away from the display assembly; the heat dissipation film has a hollow area, and a projection of the hollow area on the display assembly covers a projection of the ultrasonic fingerprint identification assembly on the display assembly. The projection of the optical shielding layer on the display assembly covers the projection of the hollow area on the display assembly.

5. The display panel of claim 4, wherein, The projection of the optical shielding layer on the display assembly and the projection of the heat dissipation film on the display assembly have an overlapping area.

6. The display panel of claim 5, wherein, In a direction from the hollow area to the heat dissipation film, the width of the overlapping area is greater than or equal to 0.5 mm and less than or equal to 1 mm.

7. The display panel of any one of claims 1-3, wherein, The material of the optical shielding layer comprises ink, carbon black, and / or silver.

8. The display panel of any one of claims 1-3, wherein, The thickness of the optical shielding layer is greater than zero and less than or equal to 3 μm.

9. A display device, characterized by comprising: The display panel comprises any one of claims 1-8.

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