Display panel and display device

Abstract

The present application discloses a display panel and a display device. The display panel includes a photosensitive area, a first substrate, and a first light filtering unit disposed on one side of the first substrate facing the light-emitting surface of the display panel. The first light filtering unit is located in the photosensitive area, and a photosensitive element is provided in the photosensitive area. The reflected light from a finger enters the display panel, passes through the first light filtering unit, and reaches the photosensitive element. The photosensitive element receives the reflected light from the finger and processes it, or transmits data to the first substrate through a trace, thereby realizing fingerprint recognition. The first light filtering unit filters the reflected light and isolates part of the ambient light. The first light filtering unit is composed of a blue light filtering portion and a red light filtering portion which are stacked, can further reduce the passage of ambient light, and can increase the induction amount of the photosensitive element, having a better recognition effect.

Description

Technical Field

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

[0002] With the development and popularization of intelligent terminals, fingerprint recognition technology has been widely applied to intelligent terminals for identity authentication. Especially in the field of smart phones, fingerprint recognition technology is commonly used on smart phones to replace traditional digital passwords, and identity authentication is realized in scenarios such as screen unlocking and mobile payment identity authentication of smart phones.

[0003] The key device of fingerprint recognition technology is a fingerprint recognition sensor for collecting fingerprint information. The fingerprint recognition sensor has a photosensitive component, and the photosensitive component receives and identifies reflected light. Since the reflected light passes through the screen body and reaches the photosensitive module, the signal of the reflected light will weaken, the photosensitive intensity will decrease, and the difficulty of fingerprint recognition will increase. Summary of the Invention

[0004] Embodiments of the present application provide a display panel and a display device, aiming to improve the problems of low photosensitive intensity of the photosensitive component and poor fingerprint recognition effect.

[0005] An embodiment of the first aspect of the present application provides a display panel, including: a photosensitive area for setting a photosensitive element; a first substrate; a first light filtering unit located on one side of the first substrate facing the light-emitting surface of the display panel, and the first light filtering unit includes a blue light filtering portion and a red light filtering portion arranged in a stacked manner; wherein, the first light filtering unit is located in the photosensitive area.

[0006] An embodiment of the second aspect of the present application provides a display device, which includes the display panel and a backlight module in any of the above embodiments, and the display device includes a photosensitive element located between the backlight module and the first substrate.

[0007] According to the display panel of the embodiment of the present application, the display panel includes a photosensitive area, a first substrate, and a first light filtering unit disposed on one side of the first substrate facing the light-emitting surface of the display panel. The first light filtering unit is located in the photosensitive area, and a photosensitive element is arranged in the photosensitive area. The reflected light from the finger enters the display panel, passes through the first light filtering unit and reaches the photosensitive element. The photosensitive element 210 receives the reflected light from the finger and processes it, or transmits data to the first substrate 100 through a trace, thereby realizing fingerprint recognition. The first light filtering unit filters the reflected light and isolates part of the ambient light. The first light filtering unit is composed of a blue light filtering portion and a red light filtering portion arranged in a stacked manner, which can further reduce the passage of ambient light, and can increase the induction amount of the photosensitive element, having a better recognition effect. Description of the Drawings

[0008] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which like or similar reference numerals denote like or similar features, and the drawings are not drawn to scale.

[0009] Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0010] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0011] Figure 3 It is a wavelength-transmittance relationship diagram of red, green, and blue light;

[0012] Figure 4 It is an induction data table;

[0013] Figure 5 is Figure 1 a cross-sectional view of area AA in

[0014] Figure 6 It is a cross-sectional view of area AA in another embodiment;

[0015] Figure 7 It is a cross-sectional view of area AA in yet another embodiment.

[0016] Description of reference numerals:

[0017] 100, first substrate;

[0018] 200, photosensitive area; 210, photosensitive element;

[0019] 300, first filter unit; 310, blue filter portion; 311, first top edge; 312, first bottom edge; 320, red filter portion; 321, second top edge; 322, second bottom edge; 330, side edge; 331, first edge; 332, second edge; 333, tip;

[0020] 400, pixel unit;

[0021] 500, second substrate;

[0022] 600, second filter unit;

[0023] 700, black matrix;

[0024] 800, backlight module;

[0025] 900, light-shielding layer; 910, light-shielding portion;

[0026] AA, display area; NA, non-display area; NA1, first non-display area; NA2, border area. Detailed implementation manners

[0027] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0028] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0029] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "above" or "over" another layer or another region, it may mean directly above the other layer or another region, or there may be other layers or regions between it and the other layer or another region. And if the component is turned over, this layer or region will be "below" or "beneath" the other layer or region.

[0030] On electronic devices such as mobile phones and tablet computers, it is necessary to integrate photosensitive components such as front cameras, infrared light sensors, and proximity light sensors on one side of the display panel. In some embodiments, a display area can be set on the above-mentioned electronic device, and the photosensitive components can be set on the back of the display area, so as to achieve a full-screen display of the electronic device while ensuring the normal operation of the photosensitive components.

[0031] Currently, glass-based fingerprint recognition has been widely developed and applied, and many mobile phone manufacturers have also invested a lot of manpower and funds in related integrated development. As a potential in-screen integration method, optical fingerprint recognition has also attracted much attention.

[0032] In order to implement the function of integrating fingerprint within a display screen, in some related technologies, an infrared sensing element is integrated on a display panel to achieve the functions of gesture recognition and touch control within a certain distance. During the touch recognition test, it is found that the externally mounted infrared lamp emits light in a divergent manner, and the sensing amount of infrared light is relatively low. It is necessary to increase the current of the infrared lamp to increase the light intensity, resulting in relatively high power consumption. If the current of the infrared lamp is not increased, the sensing amount of the photosensitive element will decrease, and the fingerprint recognition effect will be poor.

[0033] To solve the above problems, embodiments of the present application provide a display panel and a display device. The following will describe each embodiment of the display panel, the display device, and the manufacturing method of the display panel with reference to the accompanying drawings.

[0034] Embodiments of the present application provide a display panel, which may be a Liquid Crystal Display (LCD).

[0035] Please refer to Figures 1 to 4 , Figure 1 which is a schematic structural diagram of a display panel provided by an embodiment of the first aspect of the present application; Figure 2 is Figure 1 a cross-sectional view taken along line A-A in Figure 3 which is a graph of the wavelength-transmittance relationship of red, green, and blue light; Figure 4 and is a data table of the sensing amount.

[0036] As Figures 1 to 4 shown, a display panel provided by an embodiment of the first aspect of the present application includes a photosensitive area 200, a first substrate 100, and a first filter unit 300. The photosensitive area 200 is used to dispose a photosensitive element 210; the first filter unit 300 is located on one side of the first substrate 100 facing the light-emitting surface of the display panel. The first filter unit 300 includes a blue filter portion 310 and a red filter portion 320 that are stacked; wherein, the first filter unit 300 is located in the photosensitive area 200.

[0037] According to the display panel of the embodiment of the present application, the display panel includes a photosensitive area 200, a first substrate 100 and a first filter unit 300 arranged on the side of the first substrate 100 facing the light-emitting surface of the display panel. The first filter unit 300 is located in the photosensitive area 200, and the photosensitive area 200 is provided with a photosensitive element 210. The reflected light from the finger enters the display panel, passes through the first filter unit 300 to reach the photosensitive element 210, and the photosensitive element 210 receives the reflected light from the finger and processes it, or transmits the data to the first substrate 100 through wiring, thereby realizing fingerprint recognition. The first filter unit 300 filters the reflected light and isolates part of the ambient light. The first filter unit 300 is composed of a stacked blue filter part 310 and a red filter part 320, which can further reduce the passage of ambient light and increase the sensing amount of the photosensitive element 210, so that the display panel has a better recognition effect.

[0038] like Figure 3 As shown, wavelengths above 780nm are infrared, and most of the ambient light is concentrated in the 400-700nm stage. The red filter can block about 300-600nm, and the blue filter can block 600-800nm. Therefore, the R / B stacking can block most of the ambient light.

[0039] like Figure 4 As shown, the raw data is the output voltage change measured by the test platform, which can be regarded as the induction quantity. The test found that the R / B superposition can effectively reduce the environmental noise, that is, isolate most of the ambient light.

[0040] There are many ways to set the first substrate 100. For example, the first substrate 100 may include a substrate and an array substrate arranged on the substrate. Or the first substrate 100 is the substrate. Or the first substrate 100 includes a buffer layer and a support plate on the side away from the substrate. Figure 1 As shown, in some optional embodiments, the display panel also includes a display area AA and a non-display area NA, the non-display area NA includes a first non-display area NA1, wherein the first non-display area NA1 is formed by being surrounded by the display area AA; the photosensitive area 200 is located in the display area AA and / or the first non-display area NA.

[0041] The display panel further includes a display area AA and a non-display area NA. The non-display area NA includes a first non-display area NA1, wherein the first non-display area NA1 is formed surrounded by the display area AA. The photosensitive area 200 is located in the display area AA and / or the first non-display area NA1.

[0042] like Figure 1As shown, the first non-display area NA1 refers to the blind via area, and the non-display area NA further includes a border area NA2. The display area AA surrounds the first non-display area NA1. For example, the first non-display area NA1 is completely surrounded by the display area AA, or the first non-display area NA1 is partially surrounded by the display area AA. As Figure 2 shown, when the photosensitive area 200 is located in the first non-display area NA1, the first filter unit 300 is disposed over the entire surface, reducing the passage of ambient light and increasing the sensing amount of the photosensitive element 210 located in the blind via area, so that the display panel has a better recognition effect in the first non-display area NA1.

[0043] Please refer to Figure 5 , Figure 5 is Figure 1 a cross-sectional view of the AA area in

[0044] As Figure 5 shown, in these alternative embodiments, when the photosensitive area 200 is located in the display area AA, the photosensitive area 200 is provided with a photosensitive element 210. The reflected light from the finger enters the display area AA, passes through the first filter unit 300 and reaches the photosensitive element 210. The photosensitive element 210 receives the reflected light from the finger and transmits it to the first substrate 100 after processing, thereby realizing fingerprint recognition and facilitating the under-screen integration of the photosensitive element 210.

[0045] Please continue to refer to Figure 5 , in some alternative embodiments, the first filter unit 300 is disposed in the display area AA. The display panel includes a plurality of pixel units 400. The orthographic projection of the first filter unit 300 on the first substrate 100 is located between the orthographic projections of two adjacent pixel units 400 on the first substrate 100.

[0046] In these alternative embodiments, the first filter unit 300 filters the reflected light entering the display area AA and isolates part of the ambient light. The orthographic projection of the first filter unit 300 on the first substrate 100 is located between the orthographic projections of two adjacent pixel units 400 on the first substrate 100, improving the influence of the first filter unit 300 on the light emission of the pixel units 400 and enhancing the display effect of the display panel.

[0047] In some alternative embodiments, please continue to refer to Figure 5 , the display panel further includes a second substrate 500. The second substrate 500 is located on the side of the first substrate 100 close to the light-emitting surface; the first filter unit 300 is located on the second substrate 500 and on the side of the second substrate 500 close to the first substrate 100; a plurality of pixel units 400 are located on the first substrate 100 and on the side of the first substrate 100 close to the second substrate 500.

[0048] In these alternative embodiments, the second substrate 500 is located on the side of the first substrate 100 close to the light-emitting surface and is used to arrange the first filter unit 300. The first filter unit 300 is close to the side of the second substrate 500 close to the first substrate 100, so that the reflected light passing through the second substrate 500 is filtered by the first filter unit 300 to isolate part of the ambient light. A plurality of pixels are arranged on the side of the first substrate 100 close to the second substrate 500, and can emit light and display better towards the light-emitting surface of the display panel.

[0049] There are various ways to arrange the second substrate 500. The second substrate 500 may include a packaging layer and is generally a color filter substrate.

[0050] In some alternative embodiments, the display panel further includes a photosensitive element 210, and the photosensitive element 210 is arranged on the first substrate 100.

[0051] In these alternative embodiments, the photosensitive element 210 is arranged on the first substrate 100. When the reflected light entering the display area AA is filtered by the first filter unit 300, the reflected light enters the photosensitive element 210. The photosensitive element 210 receives the reflected light from the finger and transmits it to the first substrate 100 after processing, thereby realizing fingerprint recognition.

[0052] As Figure 5 shown, in some alternative embodiments, the display panel further includes a second filter unit 600. Both the first filter unit 300 and the second filter unit 600 are located on the second substrate 500 and are arranged on the same layer. The first filter unit 300 is located between two adjacent second filter units 600.

[0053] In these alternative embodiments, both the first filter unit 300 and the second filter unit 600 are arranged on the second substrate 500, and the first filter unit 300 and the second filter unit 600 are arranged alternately. On the one hand, the first filter unit 300 filters the reflected light entering the display area AA to isolate part of the ambient light. On the other hand, the light emitted by the pixel unit 400 realizes color display of the display panel through the second filter unit 600.

[0054] Please continue to refer to Figure 5 , in some alternative embodiments, the display panel further includes a black matrix 700, which is located between two adjacent first filter units 300 and second filter units 600.

[0055] In these alternative embodiments, the black matrix 700 separates the first filter unit 300 and the second filter unit 600, preventing color mixing between the first filter unit 300 and the second filter unit 600, so that the fingerprint signal passing through the first filter unit 300 and the display signal passing through the second filter unit 600 do not interfere with each other.

[0056] Please refer to Figure 6 , Figure 6 which is a cross-sectional view of the AA area in another embodiment.

[0057] In some alternative embodiments, the first filter unit 300 includes a side edge 320 facing the second filter unit 600. The side edge 320 includes a first edge 331 and a second edge 332 that are intersectingly connected. The first edge 331 and the second edge 332 form a tip 333. The tip 333 faces the second filter unit 600 from the first filter unit 300. The first filter unit 300 contacts the second filter unit 600 through the tip 333.

[0058] In these alternative embodiments, the first edge 331 and the second edge 332 form a tip 333. The first filter unit 300 contacts the second filter unit 600 through the tip 333, reducing the contact area between the first filter unit 300 and the second filter unit 600. On the one hand, it saves the process of manufacturing the black matrix 700. On the other hand, it prevents the problem that the first filter unit 300 and the second filter unit 600 contact and different color filter units may be aliased together, making the color of the outgoing light become a mixed color of red, green, and blue after passing through the filter unit.

[0059] The distance between the first edge 331 and the second edge 332 in the thickness direction gradually increases from the second filter unit 600 towards the first filter unit 300.

[0060] Optionally, the first filter unit 300 includes a side edge 320 facing the second filter unit 600. The side edge 320 includes an intersectingly connected first edge 331, a second edge 332, and a third edge. The third edge connects the first edge 331 and the second edge 332. The first filter unit 300 is adhesively connected to the second filter unit 600 through the third edge, reducing color mixing between the first filter unit 300 and the second filter unit 600.

[0061] In some alternative embodiments, the cross-section of the blue filter portion 310 is trapezoidal and includes a first top side 311 and a first bottom side 312 that are parallelly arranged. The first edge 331 is connected between the first top side 311 and the first bottom side 312. The length of the first top side 311 is less than the length of the first bottom side 312. The cross-section of the red filter portion 320 is trapezoidal and includes a second top side 321 and a second bottom side 322 that are parallelly arranged. The second edge 332 is connected between the second top side 321 and the second bottom side 322. The length of the second top side 321 is less than the length of the second bottom side 322. The first bottom side 312 and the second bottom side 322 are closely arranged.

[0062] In these alternative embodiments, the blue light filtering portion 310 and the red light filtering portion 320 are trapezoidally arranged. The two form a first light filtering portion through the close arrangement of the first bottom edge 312 and the second bottom edge 322. The length of the first top edge 311 is less than that of the first bottom edge 312, and the length of the second top edge 321 is less than that of the second bottom edge 322. Thus, the first edge 331 and the second edge 332 can form a tip 333. The first light filtering unit 300 contacts the second light filtering unit 600 through the tip 333, reducing the contact area between the first light filtering unit 300 and the second light filtering unit 600. On the one hand, it saves the process of manufacturing the black matrix 700. On the other hand, it prevents the first light filtering unit 300 and the second light filtering unit 600 from contacting and mixing colors.

[0063] In some alternative embodiments, the blue light filtering portion 310 and the red light filtering portion 320 are symmetric about the first bottom edge 312 or the second bottom edge 322.

[0064] In these alternative embodiments, the blue light filtering portion 310 and the red light filtering portion 320 are symmetric about the first bottom edge 312 or the second bottom edge 322, and the blue light filtering portion 310 and the red light filtering portion 320 have the same shape, forming a first light filtering portion with a regular shape, which is convenient for the preparation of the first light filtering portion and can filter out the ambient light in the reflected light more uniformly.

[0065] Please continue to refer to Figure 2 , when the photosensitive area 200 is located in the first non-display area NA, in some alternative embodiments, the first light filtering unit 300 is arranged in the first non-display area NA1, and a plurality of first light filtering units 300 are arranged adjacent to each other.

[0066] In these alternative embodiments, the first light filtering unit 300 is also arranged in the first non-display area NA1. When the reflected light entering the first non-display area NA1 is filtered by the first light filtering unit 300, the reflected light enters the photosensitive element 210. The photosensitive element 210 receives the reflected light from the finger and transmits it to the first substrate 100 after processing, thereby realizing fingerprint recognition in the display area AA and the first non-display area NA1.

[0067] Optionally, a plurality of first light filtering units 300 are integrally arranged or separately arranged. When a plurality of first light filtering units 300 are integrally arranged, the process preparation is simple, and the reflected light can be filtered over a relatively large area with good effects. When a plurality of first light filtering units 300 are separately arranged, the materials are reduced and the cost is lowered.

[0068] Please refer to Figure 7 , Figure 7 is a cross-sectional view of the AA area in another embodiment.

[0069] In some alternative embodiments, both the first light filtering unit 300 and the pixel unit 400 are disposed on the first substrate 100.

[0070] In these alternative embodiments, both the first light filtering unit 300 and the pixel unit 400 are disposed on the first substrate 100. On the one hand, the reflected light entering the display area AA is filtered by the first light filtering unit 300 to isolate part of the ambient light. On the other hand, both the first light filtering unit 300 and the pixel unit 400 are disposed on the first substrate 100, avoiding the influence of the first light filtering unit 300 on the light emission of the pixel unit 400 and ensuring the normal display of the display panel.

[0071] For the structural design in this embodiment, it can be applied to other display panels, and specific selection can be made according to actual situations. The present application does not specifically limit it.

[0072] An embodiment of the second aspect of the present invention further provides a display device, including the display panel and the backlight module 800 of any of the above first aspect embodiments. As Figure 7 shown, the display device includes a photosensitive element 210, and the photosensitive element 210 is located between the backlight module 800 and the first substrate 100.

[0073] According to the display device provided by the second aspect of the present invention, the photosensitive element 210 is disposed between the backlight module 800 and the first substrate 100, and the distance between the photosensitive element 210 and the light emitting surface is increased, increasing the receiving range of the photosensitive element 210, enabling it to receive more infrared light and improving the fingerprint recognition effect.

[0074] When the photosensitive element 210 is located in the display area AA and between the backlight module 800 and the first substrate 100, the first light filtering unit 300 includes a blue light filtering portion 310 and a red light filtering portion 320 stacked, which can isolate visible light in the vertical and lateral directions and ensure the fingerprint recognition effect.

[0075] In some alternative embodiments, the display device further includes a light shielding layer 900 disposed between the photosensitive element 210 and the backlight module 800, and the light shielding layer 900 includes a plurality of light shielding portions 910, and each light shielding portion 910 is disposed corresponding to each photosensitive element 210.

[0076] In these alternative embodiments, the light shielding portions 910 and the photosensitive elements 210 are disposed corresponding to each other, improving the problem that the light emitted by the backlight module 800 interferes with the photosensitive element 210 and ensuring the fingerprint recognition effect.

[0077] The display devices in the embodiments of the present invention include, but are not limited to, devices with display functions such as mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, etc.

[0078] In accordance with the embodiments of the present application as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the above description. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and its modifications based on the present application. The present application is only limited by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that, it includes: a photosensitive area for setting photosensitive elements; a first substrate; a first filter unit located on one side of the first substrate facing the light-emitting surface of the display panel, the first filter unit including a blue filter portion and a red filter portion stacked; wherein, the first filter unit is located in the photosensitive area; the display panel further includes a display area and a non-display area, the non-display area including a first non-display area, wherein, the first non-display area is formed by being surrounded by the display area; the photosensitive area is located in the display area and / or the first non-display area; the first filter unit is arranged in the display area, the display panel includes a plurality of pixel units, and the orthographic projection of the first filter unit on the first substrate is located between the orthographic projections of two adjacent pixel units on the first substrate; a second substrate located on one side of the first substrate close to the light-emitting surface; the first filter unit is located on the second substrate and on the side of the second substrate close to the first substrate; the plurality of pixel units are located on the first substrate and on the side of the first substrate close to the second substrate; a second filter unit, both the first filter unit and the second filter unit are located on the second substrate and are arranged in the same layer, and the first filter unit is located between two adjacent second filter units; the first filter unit includes a side edge facing the second filter unit, the side edge including a first edge and a second edge intersecting and connected, the first edge and the second edge forming a tip, the tip facing the second filter unit from the first filter unit, and the first filter unit and the second filter unit are in contact through the tip.

2. The display panel according to claim 1, characterized in that, it further includes a photosensitive element arranged on the first substrate.

3. The display panel according to claim 1, characterized in that, the cross-section of the blue filter portion is trapezoidal and includes a first top side and a first bottom side arranged in parallel, the first edge is connected between the first top side and the first bottom side, and the length of the first top side is less than the length of the first bottom side; the cross-section of the red filter portion is trapezoidal and includes a second top side and a second bottom side arranged in parallel, the second edge is connected between the second top side and the second bottom side, and the length of the second top side is less than the length of the second bottom side; the first bottom side and the second bottom side are closely arranged.

4. The display panel according to claim 3, characterized in that, the blue filter portion and the red filter portion are symmetrical about the first bottom side or the second bottom side.

5. The display panel according to claim 1, characterized in that, the first filter unit is arranged in the first non-display area, and a plurality of the first filter units are arranged adjacent to each other.

6. The display panel according to claim 5, characterized in that, a plurality of the first filter units are integrally arranged or separately arranged.

7. A display device, characterized in that, Comprising the display panel and the backlight module according to claim 1, the display device includes a photosensitive element, and the photosensitive element is located between the backlight module and the first substrate.

8. The display device according to claim 7, wherein, it further includes a light-shielding layer disposed between the photosensitive element and the backlight module, the light-shielding layer includes a plurality of light-shielding portions, and each of the light-shielding portions is correspondingly disposed with each of the photosensitive elements.

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