Display panel, display device and signal acquisition method

Abstract

The present application discloses a display panel, a display device and a signal acquisition method. The display panel has a display area, at least part of which is multiplexed as a light sensing area. The display panel includes a substrate, a light-emitting functional layer, a photoelectric sensor and a liquid crystal dimming structure. The light-emitting functional layer includes a plurality of light-emitting units and a pixel definition layer having a plurality of pixel openings. The light-emitting units are arranged in the pixel openings and are located in the display area. The photoelectric sensor is located on one side of the substrate and is located in the light sensing area. The orthographic projection of the photoelectric sensor on the substrate is spaced or partially overlapped with the orthographic projection of the light-emitting unit on the substrate. The liquid crystal dimming structure is located on the side of the photoelectric sensor away from the substrate and is located in the light sensing area. The orthographic projection of the liquid crystal dimming structure on the substrate at least partially overlaps with the orthographic projection of the photoelectric sensor on the substrate. According to the embodiments provided in the present application, the display panel, the display device and the signal acquisition method provided in the present application improve the accuracy of the signal collected by the photoelectric sensor.

Description

Technical Field

[0001] The present application relates to the field of display panels, and in particular to a display panel, a display device and a signal acquisition method. Background Art

[0002] In recent years, with the rapid development of display technology, photoelectric sensors can be set in display panels to collect photoelectric signals through photoelectric sensors to realize bio-information collection through photoelectric signals. External light enters the photoelectric sensor, causing the resistance value of the photoelectric sensor to change, thereby obtaining a changing electrical signal. Light generated inside the display panel can also enter the photoelectric sensor, thereby affecting the accuracy of the signal collected by the photoelectric sensor. Summary of the invention

[0003] Embodiments of the present application provide a display panel, a display device, and a signal acquisition method, the purpose of which is to improve the accuracy of signals acquired by a photoelectric sensor.

[0004] An embodiment of a first aspect of the present application provides a display panel, the display panel having a display area, at least part of which is multiplexed as a light sensing area; the display panel comprises:

[0005] substrate;

[0006] A light-emitting functional layer is located on one side of the substrate, the light-emitting functional layer includes a plurality of light-emitting units and a pixel definition layer having a plurality of pixel openings, the light-emitting units are arranged in the pixel openings and are located in the display area;

[0007] A photoelectric sensor is located on one side of the substrate and in the light sensing area, and the orthographic projection of the photoelectric sensor on the substrate is spaced apart from or partially overlapped with the orthographic projection of the light-emitting unit on the substrate;

[0008] The liquid crystal dimming structure is located on the side of the photoelectric sensor away from the substrate and in the light sensing area, and the orthographic projection of the liquid crystal dimming structure on the substrate at least partially overlaps with the orthographic projection of the photoelectric sensor on the substrate.

[0009] According to an implementation of the first aspect of the present application, the orthographic projection of the liquid crystal dimming structure on the substrate covers the orthographic projection of the photoelectric sensor on the substrate.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the liquid crystal dimming structure includes a first driving electrode, a second driving electrode and a plurality of liquid crystal molecules, the first driving electrode and the second driving electrode are arranged at intervals along a direction from the photoelectric sensor to the liquid crystal dimming structure, and the plurality of liquid crystal molecules are arranged between the first driving electrode and the second driving electrode.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the liquid crystal dimming structure includes a first driving electrode, a second driving electrode and a plurality of liquid crystal molecules, the first driving electrode and the second driving electrode are arranged at intervals along a second direction, the plurality of liquid crystal molecules are arranged between the first driving electrode and the second driving electrode, and the second direction is perpendicular to the direction from the photoelectric sensor to the liquid crystal dimming structure.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, the liquid crystal dimming structure is disposed in the pixel definition layer, and the liquid crystal dimming structure and the light-emitting unit are disposed at intervals.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes a passivation layer, the passivation layer is located between the pixel definition layer and the liquid crystal dimming structure, and the liquid crystal dimming structure is disposed in the passivation layer.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the photoelectric sensor includes an electrode, a photosensitive layer and a second electrode, the first electrode, the photosensitive layer and the second electrode are arranged in sequence from the substrate to the light-emitting functional layer, and the passivation layer covers the second electrode.

[0015] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes an encapsulation layer, the encapsulation layer is located on a side of the pixel definition layer away from the substrate, and the liquid crystal dimming structure is disposed in the encapsulation layer.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the photoelectric sensor includes an electrode, a light sensing layer, a second electrode and a light shielding layer. The first electrode, the light sensing layer and the second electrode are arranged in sequence along the direction from the substrate to the light-emitting functional layer. The light shielding layer covers the side of the light sensing layer away from the substrate. The light shielding layer has a light-transmitting opening, and the light-transmitting opening exposes the second electrode.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, the photosensitive layer includes a first surface and a second surface arranged opposite to each other, and a third surface connecting the first surface and the second surface, the first surface contacts the first electrode, the second surface contacts the second electrode, and the light-shielding layer extends along the third surface.

[0018] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes a barrier layer, and the barrier layer is located on a side of the light shielding layer facing away from the substrate.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, the barrier layer includes a first sublayer and a second sublayer stacked together, the shading layer includes a first shading portion and a second shading portion connected to each other, the first shading portion is stacked between the first sublayer and the second sublayer, and the second shading portion extends from the first shading portion to the third surface.

[0020] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes a planar layer, and the planar layer is located on a side of the barrier layer facing away from the substrate.

[0021] According to any of the aforementioned implementations of the first aspect of the present application, the melting point of the light shielding layer is greater than 260° C. An embodiment of the second aspect of the present application further provides a display device, comprising:

[0022] A display panel provided by any embodiment of the first aspect above.

[0023] The embodiment of the third aspect of the present application further provides a signal acquisition method, which is applied to the display device provided by any embodiment of the second aspect above, and the signal acquisition method includes:

[0024] Controlling the deflection of liquid crystal molecules in the liquid crystal dimming structure so that light incident on the photoelectric sensor from outside the display panel passes through the liquid crystal dimming structure;

[0025] Controlling the photoelectric sensor to collect the first light sensing signal;

[0026] Controlling the deflection of liquid crystal molecules in the liquid crystal dimming structure to block light from outside the display panel entering the photoelectric sensor;

[0027] Controlling the photoelectric sensor to collect the second light sensing signal;

[0028] The second light sensing signal is subjected to noise reduction processing according to the first light sensing signal to obtain a third light sensing signal.

[0029] In the display panel, display device and signal acquisition method provided in the embodiments of the present application, by arranging the liquid crystal dimming structure on the side of the photoelectric sensor away from the substrate and in the light sensing area, the orthographic projection of the liquid crystal dimming structure on the substrate and the orthographic projection of the photoelectric sensor on the substrate at least partially overlap, so that the liquid crystal dimming structure can block the light entering the photoelectric sensor or the light passing through the photoelectric sensor as needed to meet different photoelectric signal acquisition needs; by adjusting the liquid crystal dimming structure to block the light entering the photoelectric sensor or the light passing through the photoelectric sensor, it is possible to perform noise reduction processing on the signal collected by the photoelectric sensor when the liquid crystal dimming structure blocks the light entering the photoelectric sensor, thereby improving the processing capability of the signal collected by the photoelectric sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0031] Figure 1 is a schematic diagram of the structure of a display panel provided by an embodiment of the first aspect of the present application;

[0032] Figure 2 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0033] Figure 3 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0034] Figure 4 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0035] Figure 5 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0036] Figure 6 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0037] Figure 7 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0038] Figure 8 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the first aspect of the present application;

[0039] Fig. 9 It is a schematic diagram of the cross-sectional structure of the display panel provided in the embodiment of the first aspect of the present application.

[0040] Description of reference numerals:

[0041] 10. Substrate;

[0042] 20. driving circuit layer; 21. buffer layer; 22. active layer; 23. gate insulating layer; 24. gate layer; 25. first interlayer dielectric layer; 26. second interlayer dielectric layer; 27. source-drain metal layer;

[0043] 30. Light-emitting functional layer; 31. Pixel opening; 32. Pixel definition layer; 33. Light-emitting unit;

[0044] 40. Photoelectric sensor; 41. First electrode; 42. Photosensitive layer; 421. First surface; 422. Second surface; 423. Third surface; 43. Second electrode; 44. Light shielding layer; 441. First light shielding portion; 442. Second light shielding portion;

[0045] 50, liquid crystal dimming structure; 51, first driving electrode; 52, liquid crystal molecules; 53, second driving electrode; 61, first flat layer; 62, passivation layer; 63, second flat layer; 64, barrier layer; 641, first sublayer; 642, second sublayer;

[0046] X, thickness direction; Y, second direction. DETAILED DESCRIPTION

[0047] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with 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 the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0050] In recent years, with the rapid development of display technology, photoelectric sensors can be set in display panels to collect photoelectric signals through photoelectric sensors to realize bio-information collection through photoelectric signals. External light enters the photoelectric sensor, causing the resistance value of the photoelectric sensor to change, thereby obtaining a changing electrical signal. Light generated inside the display panel can also enter the photoelectric sensor, thereby affecting the accuracy of the signal collected by the photoelectric sensor.

[0051] The existing solutions cannot solve the technical problems well. To solve the above problems, the embodiments of the present application provide a display panel, a display device and a signal acquisition method. The following will describe various embodiments of the display panel, the display device and the signal acquisition method in conjunction with the accompanying drawings.

[0052] See also Figure 1 and Figure 2 The display panel has a display area AA, at least part of the display area AA is multiplexed as a light sensing area PA, the display panel includes a substrate 10, a light emitting functional layer 30, a photoelectric sensor 40 and a liquid crystal dimming structure 50, the light emitting functional layer 30 is located on one side of the substrate 10, the light emitting functional layer 30 includes a plurality of light emitting units 33 and a pixel definition layer 32 having a plurality of pixel openings 31, the light emitting units 33 are arranged in the pixel openings 31 and are located in the display area AA; the photoelectric sensor 40 is located on one side of the substrate 10 and is located in the light sensing area PA, the orthographic projection of the photoelectric sensor 40 on the substrate 10 is spaced or partially overlapped with the orthographic projection of the light emitting unit 33 on the substrate 10; the liquid crystal dimming structure 50 is located on the side of the photoelectric sensor 40 away from the substrate 10 and is located in the light sensing area PA, the orthographic projection of the liquid crystal dimming structure 50 on the substrate 10 and is at least partially overlapped with the orthographic projection of the photoelectric sensor 40 on the substrate 10.

[0053] It should be noted that the above-mentioned reuse of at least part of the display area AA as the light sensing area PA means that the light sensing area PA is located in the display area AA, and at least part of the display area AA is used for both displaying the picture and collecting the photoelectric signal. For example, when part of the display area AA is reused as the light sensing area PA, only part of the display area AA is used for collecting the photoelectric signal. Figure 1 In the embodiment shown, when all the display areas AA are reused as the light sensing areas PA, the entire area of ​​the display area AA can be used to collect photoelectric signals.

[0054] The display panel may further include a driving circuit layer 20, and the substrate 10, the driving circuit layer 20 and the light-emitting functional layer 30 may be stacked along the thickness direction X of the display panel. The substrate 10 may be a silicon substrate, or a flexible substrate 10 such as polyimide. The driving circuit layer 20 and the light-emitting functional layer 30 may include a plurality of layer structures, and each layer structure may be formed by chemical vapor deposition, evaporation, or the like. Figure 2 The direction indicated by the X-axis is the thickness direction X of the display panel. Those skilled in the art can start from the substrate 10 and sequentially form each layer structure along the thickness direction X.

[0055] The plurality of light-emitting units 33 may be light-emitting units 33 capable of emitting light of different colors. For example, there may be a red light-emitting unit capable of emitting red light, a green light-emitting unit capable of emitting green light, and a blue light-emitting unit capable of emitting blue light. Exemplarily, in the embodiment of the present application, an organic light-emitting diode (OLED) may be selected to prepare each of the above-mentioned light-emitting units 33. Alternatively, the light-emitting unit 33 may also be set as a micro light-emitting diode (Micro-LED) or a quantum dot light-emitting diode (QLED).

[0056] The photoelectric sensor 40, as a photosensitive element, can convert light signals into electrical signals, and the processing chip can generate biological information based on the electrical signals generated by the photoelectric sensor 40. Those skilled in the art can set a plurality of light-emitting units 33 and a plurality of photoelectric sensors 40 in the light sensing area PA as needed. The photoelectric sensor 40 and the light-emitting unit 33 can be set in the same layer or in staggered layers. The photoelectric sensor 40 and the light-emitting unit 33 are set in the same layer, which can be understood as at least part of the photoelectric sensor 40 is formed in the pixel definition layer 32, and the projection of the photoelectric sensor 40 overlaps with the projection of the light-emitting unit 33 in the direction perpendicular to the thickness direction X of the display panel. The staggered arrangement of the photoelectric sensor 40 and the light-emitting unit 33 can be understood as the photoelectric sensor 40 is not formed in the pixel definition layer 32, and the projection of the photoelectric sensor 40 does not overlap with the projection of the light-emitting unit 33 in the direction perpendicular to the thickness direction X of the display panel. The orthographic projection of the photoelectric sensor 40 on the substrate 10 is spaced apart from or partially overlapped with the orthographic projection of the light emitting unit 33 on the substrate 10 , which to some extent prevents the photoelectric sensor 40 from blocking the light emitting unit 33 from emitting light or prevents the light emitting unit 33 from blocking the photoelectric sensor 40 from receiving external light.

[0057] It can be understood by those skilled in the art that the more light-emitting units 33 there are per unit area, the more delicate the displayed image is. The more photoelectric sensors 40 there are per unit area, the richer the light change information collected is. There can be one or more orthographic projections of photoelectric sensors 40 between the orthographic projections of two adjacent light-emitting units 33. There can also be one or more orthographic projections of light-emitting units 33 between the orthographic projections of two adjacent photoelectric sensors 40. Those skilled in the art can arrange the light-emitting units 33 and photoelectric sensors 40 as needed.

[0058] Liquid crystal molecules 52 are arranged in the liquid crystal dimming structure 50, and the light passing through the liquid crystal dimming structure 50 can be adjusted by driving the liquid crystal molecules 52 to deflect. Figure 2In the embodiment shown, the liquid crystal molecules 52 are driven to deflect to a direction where the long axis is parallel to the thickness direction X of the display panel, and external light can enter the photoelectric sensor 40 through the liquid crystal dimming structure 50; Figure 3 In the illustrated embodiment, the liquid crystal molecules 52 are driven to deflect to a long axis direction intersecting with the thickness direction X of the display panel, and the liquid crystal molecules 52 block external light from entering the photoelectric sensor 40 .

[0059] The following is a specific description of the use of the photoelectric sensor 40 for collecting fingerprint information as an example: when the finger touches the screen, the light source is reflected when it is irradiated on the valley line and ridge line of the fingerprint of the finger. The liquid crystal dimming structure 50 is adjusted to a state of transmitting external light. Due to the different reflection angles of the valley line and the ridge line and the reflected light intensity, the light is projected onto the photoelectric sensor 40 through the liquid crystal dimming structure 50, causing the resistance value of the photoelectric sensor 40 to change, thereby changing the current, and obtaining a first photoelectric signal; the liquid crystal dimming structure 50 is adjusted to a state of blocking external light, and the external reflected light, ambient light, etc. will be blocked by the liquid crystal dimming structure 50, so that they cannot be projected to the photoelectric sensor 40. At this time, the change in the resistance value of the photoelectric sensor 40 is caused by the light generated inside the display panel irradiating the photoelectric sensor 40, and a second photoelectric signal is obtained. According to the first photoelectric signal, the second photoelectric signal is subjected to noise reduction processing to reduce or eliminate the signal noise caused by the light generated inside, and the valley line and ridge line of the fingerprint are identified according to the signal after noise reduction processing, that is, the fingerprint information is collected. In the process of collecting biometric information by the photoelectric sensor 40, the light source used can be the light emitting unit 33. The light generated inside the display panel may be light directly emitted by the light emitting unit 33 , or may be light reflected from a structure in the display panel.

[0060] In the display panel provided in the present application, by arranging the liquid crystal dimming structure 50 to be located on the side of the photoelectric sensor 40 away from the substrate 10 and located in the light sensing area PA, the orthographic projection of the liquid crystal dimming structure 50 on the substrate 10 and the orthographic projection of the photoelectric sensor 40 on the substrate 10 at least partially overlap, so that the liquid crystal dimming structure 50 can block the light entering the photoelectric sensor 40 or transmit the light entering the photoelectric sensor 40 as needed to meet different photoelectric signal collection needs; by adjusting the liquid crystal dimming structure 50 to block or transmit the light entering the photoelectric sensor 40, the signal collected by the photoelectric sensor 40 when the liquid crystal dimming structure 50 blocks the light entering the photoelectric sensor 40 can be subjected to noise reduction processing, thereby improving the processing capability of the signal collected by the photoelectric sensor 40.

[0061] In some embodiments, the orthographic projection of the liquid crystal dimming structure 50 on the substrate 10 covers the orthographic projection of the photoelectric sensor 40 on the substrate 10 .

[0062] The orthographic projection of the liquid crystal dimming structure 50 on the substrate 10 covers the orthographic projection of the photoelectric sensor 40 on the substrate 10, so that the liquid crystal dimming structure 50 can completely block one side of the photoelectric sensor 40, thereby increasing the area of ​​the liquid crystal dimming structure 50 blocking the light entering the photoelectric sensor 40. Optionally, the area of ​​the orthographic projection of the liquid crystal dimming structure 50 on the substrate 10 is larger than the area of ​​the orthographic projection of the photoelectric sensor 40 on the substrate 10.

[0063] See also Figure 2 and Figure 3 In some embodiments, the liquid crystal dimming structure 50 includes a first driving electrode 51, a second driving electrode 53 and a plurality of liquid crystal molecules 52. The first driving electrode 51 and the second driving electrode 53 are arranged at intervals along the direction from the photoelectric sensor 40 to the liquid crystal dimming structure 50, and the plurality of liquid crystal molecules 52 are arranged between the first driving electrode 51 and the second driving electrode 53.

[0064] The first driving electrode 51 and the second driving electrode 53 may be arranged at intervals along the thickness direction X of the display panel. The first driving electrode 51 and the second driving electrode 53 are made of light-transmitting materials so that light can penetrate the first driving electrode 51 and the second driving electrode 53 and enter the photoelectric sensor 40. The first driving electrode 51 and the second driving electrode 53 may be electrically connected to the driving circuit layer 20 through a via hole in the layer structure between the driving circuit layer 20 and the liquid crystal dimming structure 50.

[0065] By controlling the voltage of the first driving electrode 51 and the second driving electrode 53 to control the deflection of the liquid crystal molecules 52 , the liquid crystal dimming structure 50 is adjusted to switch between the light-transmitting state and the light-shielding state.

[0066] See also Figure 4 In some other embodiments, the liquid crystal dimming structure 50 includes a first driving electrode 51, a second driving electrode 53 and a plurality of liquid crystal molecules 52. The first driving electrode 51 and the second driving electrode 53 are arranged at intervals along a second direction Y, and the plurality of liquid crystal molecules 52 are arranged between the first driving electrode 51 and the second driving electrode 53. The second direction Y is perpendicular to the direction from the photoelectric sensor 40 to the liquid crystal dimming structure 50.

[0067] Since the liquid crystal dimming structure 50 can be set only on one side of the photoelectric sensor to block part or all of the photoelectric sensor, the area of ​​the liquid crystal dimming structure 50 used for shading can be smaller than the display area of ​​the display panel. The first driving electrode 51 and the second driving electrode 53 are arranged at intervals along the second direction Y, and the deflection of the liquid crystal molecules 52 can also be controlled to adjust the liquid crystal dimming structure 50 to switch between the light-transmitting state and the light-shielding state.

[0068] The light incident on the photoelectric sensor may not pass through the first driving electrode 51 and the second driving electrode 53. The first driving electrode 51 and the second driving electrode 53 may be made of a light-transmitting material or a non-light-transmitting material. When the first driving electrode 51 and the second driving electrode 53 are made of a non-light-transmitting material, the first driving electrode 51 and the second driving electrode 53 may also have the function of shielding the light emitted by the light-emitting unit 33 located near the photoelectric sensor 40 from being incident on the liquid crystal dimming structure 50, so as to reduce the light emitted by the light-emitting unit 33 from being incident on the photoelectric sensor 40 in the display panel.

[0069] See also Figure 5 In some embodiments, the liquid crystal dimming structure 50 is disposed in the pixel definition layer 32 , and the liquid crystal dimming structure 50 and the light emitting unit 33 are disposed at intervals.

[0070] A first opening may be provided in the pixel definition layer 32, a first driving electrode 51, a liquid crystal molecule 52 and a second driving electrode 53 may be provided in the first opening, and a material for preparing the pixel definition layer 32 may be covered on the second driving electrode 53 to enclose and form a sealed cavity. The liquid crystal dimming structure 50 is provided in the sealed cavity, and the pixel opening 31 is spaced apart from the sealed cavity.

[0071] The liquid crystal dimming structure 50 and the light emitting unit 33 are arranged at intervals to avoid mutual influence. The liquid crystal dimming structure 50 and the light emitting unit 33 are both arranged on the pixel definition layer 32 so that the two can share the pixel definition layer 32, thereby reducing the thickness of the display panel.

[0072] See also Figure 6 In some embodiments, the display panel further includes an encapsulation layer 60 . The encapsulation layer 60 is located on a side of the pixel definition layer 32 facing away from the substrate 10 . The liquid crystal dimming structure 50 is disposed in the encapsulation layer 60 .

[0073] The encapsulation layer 60 may include a plurality of encapsulation sublayers, and the materials of each encapsulation sublayer may be the same or different. Optionally, the encapsulation layer 60 includes a first encapsulation sublayer, a second encapsulation sublayer, and a third encapsulation sublayer sequentially arranged along the substrate 10 to the light-emitting functional layer 30, and the liquid crystal dimming structure 50 may be arranged in any one or more of the first encapsulation sublayer, the second encapsulation sublayer, and the third encapsulation sublayer. The first encapsulation sublayer and the third encapsulation sublayer may be made of inorganic materials, and the second encapsulation sublayer may be made of organic materials.

[0074] By disposing the liquid crystal dimming structure 50 in the encapsulation layer, the liquid crystal dimming structure 50 and the light emitting unit 33 are disposed in staggered layers to avoid mutual interference between the liquid crystal dimming structure 50 and the light emitting unit 33. Since the liquid crystal dimming structure 50 is disposed in the encapsulation layer, the photoelectric sensor 40 can be disposed in the pixel definition layer 32 as needed, or in any functional layer of the pixel definition layer 32 close to the substrate 10.

[0075] See also Figure 7 In some embodiments, the display panel further includes a passivation layer 62 (PVX layer), the passivation layer 62 is located between the pixel definition layer 32 and the photoelectric sensor 40 , and the liquid crystal dimming structure 50 is disposed in the passivation layer 62 .

[0076] The display panel may further include a first planar layer 61, a photoelectric sensor 40, a passivation layer 62, a second planar layer 63 and a pixel definition layer 32 stacked together. The passivation layer 62 may protect the conductive layer in the driving circuit layer 20 on the one hand, and on the other hand, the passivation layer 62 has a certain thickness, which may provide space for setting up the liquid crystal dimming structure 50.

[0077] See also Figure 8 In some embodiments, the photoelectric sensor 40 includes a first electrode 41, a light sensing layer 42, a second electrode 43 and a light shielding layer 44. The first electrode 41, the light sensing layer 42 and the second electrode 43 are arranged in sequence along the direction from the substrate 10 to the light-emitting functional layer 30. The light shielding layer 44 covers the side of the light sensing layer 42 away from the substrate 10. The light shielding layer 44 has a light-transmitting opening, and the light-transmitting opening exposes the second electrode 43.

[0078] The first electrode 41, the light sensing layer 42 and the second electrode 43 are sequentially arranged along the direction from the substrate 10 to the display function layer, so that the first electrode 41, the light sensing layer 42 and the second electrode 43 can be sequentially formed along the thickness direction X of the display panel, thereby improving the high external quantum efficiency of the photoelectric sensor 40 and reducing the leakage current. Compared with the photoelectric sensor 40 arranged along the thickness direction X perpendicular to the display panel, the present application can arrange the various layers of the driving circuit layer 20 and the light-emitting function layer 30 along the thickness direction X, and the various layers of the photoelectric sensor 40 arranged along the thickness direction X make the preparation direction consistent.

[0079] Light passing through the liquid crystal dimming structure 50 can enter the second electrode 43 through the light-transmitting opening to change the resistance of the photoelectric sensor 40. The second electrode 43 is an electrode made of a light-transmitting conductive material so that light can pass through the second electrode 43 to act on the photosensitive layer 42.

[0080] The light shielding layer 44 covers the side of the light sensing layer 42 away from the substrate 10 to reduce or avoid the interference of stray light on the photoelectric sensor 40. The light shielding layer 44 can be a black glue with strong light absorption effect.

[0081] Please refer to Fig. 9 In some embodiments, the light sensing layer 42 includes a first surface 421 and a second surface 422 that are oppositely arranged, and a third surface 423 connecting the first surface 421 and the second surface 422, the first surface 421 contacts the first electrode 41, the second surface 422 contacts the second electrode 43, and the light shielding layer 44 extends along the third surface 423.

[0082] The light shielding layer 44 extends along the third surface 423, that is, the light shielding layer 44 is arranged around the circumference of the light sensing layer 42 to prevent the light not entering through the second electrode 43 from affecting the resistance of the photoelectric sensor 40, so as to reduce or avoid the interference of stray light on the photoelectric sensor 40. The light shielding layer 44 can also extend to the surface of the second electrode 43 away from the substrate 10, covering the side surface of the second electrode 43.

[0083] In some embodiments, the display panel further includes a barrier layer 64 (Barrier Layer, BL), and the barrier layer 64 is located on a side of the light shielding layer 44 facing away from the substrate 10 .

[0084] The driving circuit layer 20 may include a buffer layer 21 (BUF), an active layer 22, a gate insulating layer 23 (GI), a gate layer 24 (GT), a first interlayer dielectric layer 25 (CI), a second interlayer dielectric layer 26 (ILD), and a source-drain metal layer 27 (SD) stacked in sequence. The barrier layer 64 may be disposed on the side of the second interlayer dielectric layer 26 away from the substrate 10 and cover a portion of the source-drain metal layer. The active layer 22 may be amorphous silicon a-si, p-type doped silicon p-Si, or metal oxide. In specific implementation, it may be flexibly arranged as needed, and is not limited here.

[0085] The barrier layer 64 can prevent the penetration of gas and moisture to increase the service life of the display panel. The barrier layer 64 can also prevent external light from entering the interior of the display panel to improve the clarity and contrast of the image displayed by the display panel. The barrier layer 64 can include multiple sublayers, each of which can be made of different materials to have different barrier capabilities.

[0086] In some embodiments, the barrier layer 64 includes a first sublayer 641 and a second sublayer 642. The light shielding layer 44 includes a first light shielding portion 441 and a second light shielding portion 442 connected to each other. The first light shielding portion 441 is stacked and arranged on a side of the barrier layer 64 away from the substrate 10, and the second light shielding portion 442 extends from the barrier layer 64 to the third surface 423.

[0087] When preparing the display panel, the first electrode 41 may be prepared first, and then a first sublayer 641 having an opening exposing the first electrode 41 may be prepared, and then a light sensing layer 42, a second electrode 43 and a light shielding layer 44 may be prepared corresponding to the opening, and part of the material used to prepare the light shielding layer 44 may be located on the first sublayer 641 to form a first light shielding portion 441, and part of the material used to prepare the light shielding layer 44 may be located on the light sensing layer 42 to form a second light shielding portion 442. A second sublayer 642 covering the light shielding layer 44 may then be prepared.

[0088] By setting the shading layer 44 to include a first shading portion 441 and a second shading portion 442 connected to each other, the first shading portion 441 is stacked on the side of the blocking layer 64 away from the substrate 10, and the second shading portion 442 extends from the blocking layer 64 to the third surface 423 to ensure that the shading layer 44 blocks the third surface 423 of the light sensing layer 42.

[0089] In some embodiments, the melting point of the light shielding layer 44 is greater than 260° C.

[0090] The melting point of the light shielding layer 44 is set to be greater than 260° C. to prevent the structure of a portion of the light shielding layer 44 from being damaged by high temperature during the subsequent process of setting other functional layers on the light shielding layer 44 .

[0091] In some embodiments, the display panel further includes a second planar layer 63 (PLN), where the second planar layer 63 is located on a side of the barrier layer 64 facing away from the substrate 10 .

[0092] The second planarization layer 63 can planarize the side of the photoelectric sensor 40 facing away from the substrate 10, so as to facilitate the formation of other functional layers on the side of the planarization layer facing away from the substrate 10. Optionally, the second planarization layer 63 has an opening exposing the second electrode 43, and the conductive layer located on the side of the second planarization layer 63 facing away from the substrate 10 is electrically connected to the second electrode 43 through the opening. Part of the passivation layer 62 and part of the second planarization layer 63 are spaced between the photoelectric sensor 40 and the liquid crystal dimming structure 50 to reduce the distance between the photoelectric sensor 40 and the liquid crystal dimming structure 50, and improve the light shielding effect of the liquid crystal dimming structure 50 on the photoelectric sensor 40.

[0093] On the second aspect, the embodiments of the present application further provide a display device. In the display device provided in the embodiments of the present application, it has the relevant structure of the aforementioned display panel. Please refer to the display panels provided in the above embodiments. It has all the beneficial effects of the aforementioned display panel and will not be repeated here.

[0094] In a third aspect, an embodiment of the present application further provides a signal acquisition method, which is applied to the display device provided in the second aspect, and the method includes:

[0095] S110, controlling the deflection of liquid crystal molecules in the liquid crystal dimming structure so that light incident on the photoelectric sensor from outside the display panel passes through the liquid crystal dimming structure;

[0096] S120, controlling the photoelectric sensor to collect a first light sensing signal;

[0097] S130, controlling the deflection of liquid crystal molecules in the liquid crystal dimming structure to shield the light from outside the display panel entering the photoelectric sensor;

[0098] S140, controlling the photoelectric sensor to collect a second light sensing signal;

[0099] S150, performing noise reduction processing on the second light sensing signal according to the first light sensing signal to obtain a third light sensing signal.

[0100] By controlling the voltage of the first driving electrode and the second driving electrode to control the deflection of the liquid crystal molecules in the liquid crystal dimming structure, the external light is transmitted through the liquid crystal dimming structure into the photoelectric sensor, and the photoelectric sensor is controlled to collect the first light sensing signal, which is a resistance change signal of the photoelectric sensor caused by the internal light and external light of the display panel.

[0101] By controlling the voltage of the first driving electrode and the second driving electrode, the deflection of the liquid crystal molecules in the liquid crystal dimming structure is controlled, and the liquid crystal molecules block the light entering the photoelectric sensor from outside the display panel, and the photoelectric sensor is controlled to collect a second light sensing signal. The second light sensing signal is not affected by external light, and the second light sensing signal is a resistance change signal of the photoelectric sensor caused by the light inside the display panel.

[0102] The second light sensing signal is subjected to noise reduction processing according to the first light sensing signal, that is, the part of the first light sensing signal affected by the internal light of the display panel is eliminated, so that the third light sensing signal more accurately represents the change of the external light incident on the photoelectric sensor.

[0103] The present application does not limit the order of collecting the first light sensing signal and the second light sensing signal, that is, the signal collection method provided in the present application can be executed in the execution order of S110, S120, S130, S140, and S150, or the signal collection method provided in the present application can be executed in the execution order of S130, S140, S110, S120, and S150.

[0104] Optionally, a control unit electrically connected to the display panel is provided in the display device, or a control circuit is provided in the display panel, and the control unit or the control circuit controls the electrical parameters of the input liquid crystal dimming structure to achieve control of the liquid crystal molecules in the liquid crystal dimming structure to deflect at different angles.

[0105] According to the embodiments of the present application as above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments 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 the 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: The display panel has a display area, at least part of which is reused as a light sensing area; the display panel includes: substrate; A light-emitting functional layer, located on one side of the substrate, the light-emitting functional layer comprises a plurality of light-emitting units and a pixel definition layer having a plurality of pixel openings, the light-emitting units are arranged in the pixel openings and are located in the display area; A photoelectric sensor is located at one side of the substrate and in the light sensing area, and the orthographic projection of the photoelectric sensor on the substrate is spaced apart from or partially overlapped with the orthographic projection of the light-emitting unit on the substrate; The liquid crystal dimming structure is located on a side of the photoelectric sensor away from the substrate and in the light sensing area, and the orthographic projection of the liquid crystal dimming structure on the substrate at least partially overlaps with the orthographic projection of the photoelectric sensor on the substrate.

2. The display panel according to claim 1, characterized in that: The orthographic projection of the liquid crystal dimming structure on the substrate covers the orthographic projection of the photoelectric sensor on the substrate.

3. The display panel according to claim 1, characterized in that: The liquid crystal dimming structure includes a first driving electrode, a second driving electrode and a plurality of liquid crystal molecules. The first driving electrode and the second driving electrode are arranged at intervals along a direction from the photoelectric sensor to the liquid crystal dimming structure, and the plurality of liquid crystal molecules are arranged between the first driving electrode and the second driving electrode.

4. The display panel according to claim 1, characterized in that: The liquid crystal dimming structure includes a first driving electrode, a second driving electrode and a plurality of liquid crystal molecules, the first driving electrode and the second driving electrode are arranged at intervals along a second direction, the plurality of liquid crystal molecules are arranged between the first driving electrode and the second driving electrode, and the second direction is perpendicular to a direction from the photoelectric sensor to the liquid crystal dimming structure.

5. The display panel according to claim 1, characterized in that: The liquid crystal dimming structure is arranged in the pixel definition layer, and the liquid crystal dimming structure and the light emitting unit are arranged at intervals.

6. The display panel according to claim 1, characterized in that: The display panel further comprises an encapsulation layer, wherein the encapsulation layer is located on a side of the pixel definition layer away from the substrate, and the liquid crystal dimming structure is arranged in the encapsulation layer.

7. The display panel according to claim 1, characterized in that: The display panel further comprises a passivation layer, wherein the passivation layer is located between the pixel definition layer and the photoelectric sensor, and the liquid crystal dimming structure is arranged in the passivation layer.

8. The display panel according to claim 1, characterized in that: The photoelectric sensor comprises a first electrode, a light sensing layer, a second electrode and a light shielding layer, wherein the first electrode, the light sensing layer and the second electrode are sequentially arranged along a direction from the substrate to the light-emitting functional layer, the light shielding layer covers a side of the light sensing layer away from the substrate, the light shielding layer has a light-transmitting opening, and the light-transmitting opening exposes the second electrode; Preferably, the light sensing layer includes a first surface and a second surface that are arranged opposite to each other, and a third surface connecting the first surface and the second surface, the first surface is in contact with the first electrode, the second surface is in contact with the second electrode, and the light shielding layer extends along the third surface; Preferably, the display panel further comprises a barrier layer, and the barrier layer is located on a side of the light shielding layer away from the substrate; Preferably, the barrier layer includes a first sublayer and a second sublayer stacked together, the light shielding layer includes a first light shielding portion and a second light shielding portion connected to each other, the first light shielding portion is stacked between the first sublayer and the second sublayer, and the second light shielding portion extends from the first light shielding portion to the third surface; Preferably, the display panel further comprises a flat layer, and the flat layer is located on a side of the barrier layer away from the substrate; Preferably, the melting point of the light-shielding layer is greater than 260°C.

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

10. A signal acquisition method, characterized in that: Applied to the display device as claimed in claim 9, the signal acquisition method comprises: Controlling the deflection of liquid crystal molecules in the liquid crystal dimming structure so that light incident on the photoelectric sensor from outside the display panel passes through the liquid crystal dimming structure; Controlling the photoelectric sensor to collect a first light sensing signal; Controlling the deflection of liquid crystal molecules in the liquid crystal dimming structure to shield the light incident from the outside of the display panel into the photoelectric sensor; Controlling the photoelectric sensor to collect a second light sensing signal; The second light sensing signal is subjected to noise reduction processing according to the first light sensing signal to obtain a third light sensing signal.

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