Display panel, display device and method for identifying watched position of display device

Abstract

The invention relates to a display panel which is provided with a display area and a non-display area, the display area is provided with a plurality of optical convergence structures, the optical convergence structures extend to the non-display area, and the non-display area is provided with a plurality of optical collimation structures and a plurality of light sensing units in one-to-one correspondence with the optical collimation structures. The optical collimation structure is used for collecting infrared light reflected by eyes to the surface of the light sensing unit. If the infrared light semaphore sensed by a certain light sensing unit is smaller than the infrared light semaphore of the light sensing unit in the surrounding area, it is judged that the pupil watches the position where the light sensing unit is located. Regional collimation of the eye reflected light is achieved through the light path collimation structure, rapid positioning and tracking of pupils can be achieved in a non-imaging mode, the data size is small, the information processing time is shortened, and the response speed of the eye movement tracking system is increased. The invention further provides a display device comprising the display panel and a method for recognizing the gazed position of the display device.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel, a display device, and a method for identifying a gaze position thereof. Background Art

[0002] With the development of pupil-iris technology and the advancement of human eye recognition algorithms, the latest visual field positioning system - eye tracking system came into being.

[0003] The eye tracking systems currently used all use cameras to capture images, which are then sent to chips for processing, denoising, and demodulation to achieve eye tracking and positioning. These methods all require cameras to take pictures and images, which results in large amounts of data, long information processing times, and slow response speeds for eye tracking systems.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to improve the response speed of an eye tracking system and to provide a display panel, a display device and a method for identifying a gaze position thereof.

[0006] According to one aspect of the present disclosure, a display panel is provided, which has a display area and a non-display area located outside the display area. The display panel also includes a substrate, multiple optical collimation structures, multiple optical convergence structures and multiple photosensitive units. The multiple optical collimation structures are arranged on one side of the substrate and are located in the non-display area; the multiple optical convergence structures are arranged on one side of the substrate and are located in the display area; the multiple photosensitive units are arranged between the substrate and the optical collimation structure and are located in the non-display area, and the multiple photosensitive units correspond one-to-one to the multiple optical collimation structures; the optical collimation structure is used to collect infrared light reflected by the eye to the surface of the photosensitive unit; the multiple optical collimation structures and the multiple optical convergence structures are in the same layer and material.

[0007] In one embodiment of the present disclosure, the angle range in which the light sensing unit receives infrared light is a collimated angle, and the collimated angle is calculated by the following formula:

[0008]

[0009]

[0010]

[0011] Among them, D is the distance between the eye and the photosensitive unit, m is the eye movement distance, w is the width of the eye movement range, q is the number of photosensitive units set in the sub-non-display area on one side of the display area, γ is the field of view of the eye viewing the display panel, and η is the viewing angle change value.

[0012] In one embodiment of the present disclosure, the signal difference between two adjacent light sensing units is calculated by the following formula:

[0013] ΔS=S1-S0 4);

[0014] S0=A1×α1+(A21+A22)×α2 5);

[0015] S1=B3×α1+(B21+B22)×α2 6);

[0016] Among them, ΔS is the signal difference, S0 is the signal value of the first photosensitive unit, S1 is the signal value of the second photosensitive unit, A1 is the coverage area of ​​the collimation angle corresponding to the first photosensitive unit on the pupil, A21 is the coverage area of ​​the collimation angle corresponding to the first photosensitive unit on the iris on one side of the pupil, and A22 is the coverage area of ​​the collimation angle corresponding to the first photosensitive unit on the iris on the other side of the pupil; B1 is the coverage area of ​​the collimation angle corresponding to the second photosensitive unit on the through hole, B21 is the coverage area of ​​the collimation angle corresponding to the second photosensitive unit on the iris on one side of the pupil, B22 is the coverage area of ​​the collimation angle corresponding to the second photosensitive unit on the other side of the pupil, α1 is the reflectivity of the pupil to infrared light, and α2 is the reflectivity of the iris to infrared light.

[0017] In one embodiment of the present disclosure, the coverage area of ​​the first light sensing unit on the pupil at the collimation angle is equal to the size of the pupil.

[0018] In one embodiment of the present disclosure, the collimation angle is between 1.13 degrees and 3.9 degrees.

[0019] In one embodiment of the present disclosure, the optical collimation structure is a first microlens, and the focus of the first microlens is located on the surface of the photosensitive unit.

[0020] In one embodiment of the present disclosure, the first microlens is a circular first microlens and / or a cylindrical first microlens, and the height of the cylindrical first microlens is greater than the diameter of the circular first microlens.

[0021] In one embodiment of the present disclosure, the first microlens is a circular first microlens, and the radius of curvature of the circular first microlens satisfies:

[0022] R=(n1×L1+......nt×Lt)×(nlens-1) 7);

[0023] In the direction away from the substrate, n1 is the refractive index of the first layer between the first microlens and the photosensitive unit, nt is the refractive index of the tth layer, L1 is the thickness of the first layer, Lt is the thickness of the tth layer, and R is the radius of curvature of the circular first microlens.

[0024] In one embodiment of the present disclosure, the display panel further includes a filter structure, which is disposed between the optical collimation structure and the photosensitive unit, and includes a stacked red filter layer, a green filter layer, and a blue filter layer.

[0025] In one embodiment of the present disclosure, the display panel also includes a second light absorbing portion, which is arranged at the periphery of the filter structure, and the orthographic projection of the second light absorbing portion on the base substrate forms an enclosing area, and the orthographic projection of the photosensitive unit on the base substrate covers the enclosing area.

[0026] In one embodiment of the present disclosure, the first microlens is a cylindrical first microlens, including a cylindrical first microlens arranged along a first direction and a cylindrical first microlens arranged along a second direction, and the second direction is perpendicular to the first direction.

[0027] In one embodiment of the present disclosure, the non-display area is shaped as a rectangular frame, including four sub-non-display areas located around the display area, one of which is provided with a binding circuit, and the remaining three sub-non-display areas are respectively provided with a group of light sensing units.

[0028] In one embodiment of the present disclosure, the display panel further includes a driving circuit layer, and the light sensing unit is disposed on the same layer as the driving circuit layer.

[0029] According to another aspect of the present disclosure, a display device is provided, comprising an optical path adjustment lens, an infrared light source, and a display panel provided by any one aspect of the present disclosure, wherein the infrared light source is disposed at the periphery of the lens; and the display panel is disposed on a side of the infrared light source and the optical path adjustment lens away from the eyes.

[0030] According to another aspect of the present disclosure, a method for identifying a gazed position of a display device provided in another aspect of the present disclosure is provided, the method comprising:

[0031] Send infrared light to the eyes through an infrared light source;

[0032] When the infrared light reflected by the eye is reflected to the optical path collimation structure, if the infrared light signal amount sensed by a certain photosensitive unit is smaller than the infrared light signal amount of the photosensitive units in its surrounding area, it is determined that the pupil is looking at the position of the photosensitive unit.

[0033] The display panel disclosed in the present invention has a display area and a non-display area. The display area is provided with a plurality of optical convergence structures. The optical convergence structures are extended to the non-display area. A plurality of optical collimation structures are provided in the non-display area, and a plurality of photosensitive units corresponding to the plurality of optical collimation structures are provided one by one. The optical collimation structure is used to collect infrared light reflected by the eye to the surface of the photosensitive unit. If the amount of infrared light signal sensed by a certain photosensitive unit is less than the amount of infrared light signal of the photosensitive units in the surrounding area, it is determined that the pupil is looking at the position of the photosensitive unit. By realizing regional collimation of the light reflected from the eye through the optical path collimation structure, rapid positioning and tracking of the pupil can be achieved in a non-imaging manner, with a small amount of data, reducing the time for information processing and improving the response speed of the eye tracking system.

[0034] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0036] Figure 1 It is a cross-sectional schematic diagram of a display panel involved in an embodiment of the present disclosure.

[0037] Figure 2 The figure is a plan view of a display panel according to an embodiment of the present disclosure.

[0038] Figure 3 It is a schematic diagram of the structure of a first microlens involved in an embodiment of the present disclosure.

[0039] Figure 4 It is a schematic diagram of the collimation angle of the optical collimation structure corresponding to the photosensitive unit involved in the embodiment of the present disclosure.

[0040] Figure 5 It is a schematic diagram of the relationship between the angle range of infrared light received by the photosensitive unit involved in the embodiment of the present disclosure and the optical collimation structure of the optical collimation structure.

[0041] Figure 6 This is a schematic diagram of a light sensing unit according to an embodiment of the present disclosure corresponding to an optical collimation structure when the collimation angle is relatively small.

[0042] Figure 7 It is a schematic diagram of a case where the collimation angle of the optical collimation structure corresponding to the photosensitive unit involved in the embodiment of the present disclosure is large.

[0043] Figure 8 This is a schematic diagram of a case where the coverage areas of the first photosensitive unit and the second photosensitive unit involved in an embodiment of the present disclosure on the eye are adjacent when the collimation angle is the first type.

[0044] Fig. 9 Schematic diagram of the coverage area of ​​the first photosensitive unit and the second photosensitive unit on the eye according to an embodiment of the present disclosure when the collimation angle is the second type.

[0045] Fig.10 Schematic diagram of the coverage area of ​​the first photosensitive unit and the second photosensitive unit on the eye involved in the embodiment of the present disclosure when the collimation angle is the third type.

[0046] Fig.11 Schematic diagram of the coverage area of ​​the first photosensitive unit and the second photosensitive unit on the eye according to an embodiment of the present disclosure when the collimation angle is the fourth type.

[0047] Fig.12 When the collimation angle is the first type, the embodiments of the present disclosure involve the distribution of the coverage area of ​​the first light sensing unit on the pupil and the iris, and the distribution of the coverage area of ​​the second light sensing unit on the pupil and the iris.

[0048] Fig.13 It is a cross-sectional schematic diagram of another display panel involved in an embodiment of the present disclosure.

[0049] Fig.14 It is a schematic plan view of another display panel involved in the embodiment of the present disclosure.

[0050] Fig.15 It is a schematic diagram of the structure of another first microlens involved in an embodiment of the present disclosure.

[0051] Fig.16 Schematic diagram of the relationship between the arch height of the first microlens and the signal amount of the photosensitive unit involved in the embodiment of the present disclosure.

[0052] Fig.17 It is a schematic diagram of the structure of a display device involved in an embodiment of the present disclosure.

[0053] Fig.18 The present invention is a flowchart of a method for identifying a gazed position of a display device according to an embodiment of the present disclosure.

[0054] In the figure: 1, silicon substrate, 10, base substrate, 12, driving circuit layer, 11, transistor, 111, gate, 112, first active layer, 113, first electrode, 114, second electrode, 115, gate insulation layer, 116, first data line, 117, second data line, 118, first scanning line, 12, first transistor, 13, second transistor, 14, contact hole, 15, insulation layer, 16, third conductive layer, 17, photosensitive unit, 171, second active layer, 172, third electrode, 173, fourth electrode, 174, third data line, 175, fourth data line, 1701, first photosensitive unit, 1702, second photosensitive unit, 18, fourth conductive layer, 19, binding circuit, 2, light-emitting layer, 21, first conductive layer, 22, organic light-emitting functional layer, 23, second conductive layer, 201, first light-emitting device, 202, second light-emitting device Optical device, 2001, first electrode, 2002, second electrode, 2003, light-emitting unit, 3, first encapsulation layer, 4, color filter layer, 41, first light absorption part, 42, red filter pattern, 43, green filter pattern, 44, blue filter pattern, 5, second encapsulation layer, 61, filter structure, 611, red filter layer, 612, green filter layer, 613, blue filter layer, 62, second light absorption part, 7, filling layer , 71. First filling part, 72. Second filling part, 8. Microlens layer, 81. First microlens, 82. Second microlens, 83. First adhesive layer, 84. Second adhesive layer, 9. Cover plate, 100. Display area, 200. Non-display area, 2001. Sub-non-display area, 300. Infrared light source, 400. Optical path adjustment lens, 500. Eye, 5001-eye movement range, 5002-pupil, 5003-iris. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0056] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0057] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0058] The present disclosure provides a display panel. Figures 1 to 17 As shown, the display panel has a display area 100 and a non-display area 200 located outside the display area 100. The display panel also includes a base substrate 10, multiple optical collimation structures, multiple optical convergence structures and multiple photosensitive units 17. The multiple optical collimation structures are arranged on one side of the base substrate 10 and are located in the non-display area 200; the multiple optical convergence structures are arranged on one side of the base substrate 10 and are located in the display area 100; the multiple photosensitive units 17 are arranged between the base substrate 10 and the optical collimation structures and are located in the non-display area 200, and the multiple photosensitive units 17 correspond one-to-one to the multiple optical collimation structures; the optical collimation structure is used to collect infrared light reflected by the eye 500 to the surface of the photosensitive unit 17; the multiple optical collimation structures and the multiple optical convergence structures are in the same layer and material.

[0059] The display area 100 of the display panel is provided with a plurality of optical convergence structures, and the optical convergence structures are extended to the non-display area 200. The non-display area 200 is provided with a plurality of optical collimation structures, and a plurality of photosensitive units 17 corresponding to the plurality of optical collimation structures. The optical collimation structure is used to collect the infrared light reflected by the eye 500 to the surface of the photosensitive unit 17. If the amount of infrared light signal sensed by a certain photosensitive unit 17 is less than the amount of infrared light signal of the photosensitive units 17 in the surrounding area, it is determined that the pupil 5002 is looking at the position of the photosensitive unit 17. By realizing the regional collimation of the light reflected by the eye 500 through the optical path collimation structure, the pupil 5002 can be quickly positioned and tracked in a non-imaging manner, with a small amount of data, which reduces the time of information processing and improves the response speed of the eye tracking system.

[0060] The display panel involved in the implementation manner of the present disclosure is described in detail below with reference to specific embodiments.

[0061] like Figure 1 As shown, the display panel includes a driving backplane 1 and a pixel layer. The driving backplane 1 includes a base substrate 10 and a driving circuit layer 100. For the sake of clarity, Figure 1 Only the first sub-pixel region and the second sub-pixel region adjacent to the pixel layer are shown, and for each sub-pixel region, only the light-emitting element and the transistor 11 directly connected to the light-emitting element in the driving circuit layer 100 are shown. For example, the transistor 11 can be a driving transistor configured to control the magnitude of the current driving the light-emitting element to emit light. For example, the transistor 11 can also be a light-emitting control transistor for controlling whether the current driving the light-emitting element to emit light flows. The embodiments of the present disclosure are not limited to this.

[0062] The display panel includes a base substrate 10, a first conductive layer 21, an organic light-emitting functional layer 22, and a second conductive layer 23 disposed on the base substrate 10. The first conductive layer 21 is disposed on a side of the driving circuit layer 100 away from the base substrate 10, the organic light-emitting functional layer 22 is disposed on a side of the first conductive layer 21 away from the base substrate 10, and the second conductive layer 23 is disposed on a side of the organic light-emitting functional layer 22 away from the base substrate 10.

[0063] The first conductive layer 21 includes a first electrode 2001 of the first light emitting device 201 and a first electrode 2001 of the second light emitting device 202, which are insulated from each other and located in the first sub-pixel region and the second sub-pixel region, respectively, and the first electrode 2001 of the first light emitting device 201 and the first electrode 2001 of the second light emitting device 202 are disconnected from each other. The second conductive layer 23 includes a second electrode 2002 of the first light emitting device 201 and a second electrode 2002 of the second light emitting device 202, which are connected to each other and located in the first sub-pixel region and the second sub-pixel region, respectively.

[0064] In order to improve the luminous efficiency and the color gamut of the light-emitting device, a plurality of light-emitting layers 2 stacked on each other may also be used to emit white light, that is, the organic light-emitting functional layer 22 may include a plurality of sub-light-emitting functional layers, and the plurality of sub-light-emitting functional layers are stacked in a direction perpendicular to the base substrate 10. For example, the organic functional layer 22 includes two yellow sub-light-emitting functional layers and a blue sub-light-emitting functional layer stacked on each other, or the organic functional layer 22 includes two red sub-light-emitting functional layers, a green sub-light-emitting functional layer, and a blue sub-light-emitting functional layer stacked on each other.

[0065] like Figure 1As shown, the display panel provided by the embodiment of the present disclosure uses a silicon substrate as a base substrate 10, and a driving circuit layer 100 can be integrated on the silicon substrate to form a driving backplane 1. In this case, a higher precision can be achieved due to the silicon-based circuit. The first light-emitting element and the second light-emitting element are formed on the driving backplane 1, and the driving backplane 1 includes a base substrate 10 and a driving circuit layer 100 formed on the base substrate 10, and the silicon substrate is, for example, single crystal silicon or high-purity silicon.

[0066] The driving circuit layer 100 is located in the display area 100. The driving circuit layer 100 is formed on the substrate 10 by a semiconductor process. For example, a first active layer 112 (i.e., a semiconductor layer), a first electrode 113, and a second electrode 114 of the transistor 11 are formed in the substrate 10 by a doping process, and an insulating layer 15 is formed by a silicon oxidation process, and a plurality of third conductive layers 16 are formed by a sputtering process. The semiconductor layer (i.e., Figure 1 The first active layer in the substrate 10 is located inside the substrate 10 or is a part of the substrate 10.

[0067] like Figure 1 As shown, the first light emitting element is electrically connected to the first transistor 12, and the second light emitting element is electrically connected to the second transistor 13. The embodiments of the present disclosure do not limit the specific types of the first transistor 12 and the second transistor 13. The first transistor 12 is exemplarily described below, which is also applicable to the second transistor 13, and thus will not be repeated.

[0068] For example, the transistor 11 includes a gate 111, a gate insulating layer 115, a first active layer 112, a first pole 113, and a second pole 114. The embodiment of the present disclosure does not limit the type, material, and structure of the first transistor 12. For example, it can be a top gate type, a bottom gate type, etc. The first active layer 112 of the first transistor 12 can be an inorganic semiconductor material such as microcrystalline silicon, amorphous silicon, polycrystalline silicon (low temperature polycrystalline silicon or high temperature polycrystalline silicon), an oxide semiconductor (such as IGZO), or an organic material, such as PBTTT, PDBT-co-TT, PDQT, PDVT-10, dinaphtho-dithiophene (DNTT) or pentacene. For example, the first transistor 12 can be N-type or P-type.

[0069] Some embodiments of the present disclosure are described by taking a field effect transistor (such as a MOS field effect transistor) formed in a silicon substrate as an example. In this example, the silicon substrate is doped (p-type doping or n-type doping) to form the first active layer 112 of the transistor, that is, the first active layer 112 of the transistor is located in the silicon substrate, or the first active layer 112 of the transistor is part of the silicon substrate. The source and drain of the transistor used here can be symmetrical in structure, so the source and drain can be indistinguishable in structure. In the embodiments of the present disclosure, in order to distinguish the two poles of the transistor other than the gate, for example, one of the poles can be directly described as the first pole 113 and the other pole as the second pole 114.

[0070] The display panel may further include a third conductive layer 16, the third conductive layer 16 including a plurality of sub-third conductive layers 161 arranged at intervals, and the plurality of sub-third conductive layers 161 are respectively arranged in one-to-one correspondence with the plurality of first electrodes 2001 included in the first conductive layer 21. In the top emission structure, the third conductive layer 16 may be arranged as a reflective layer for reflecting the light emitted by the light-emitting element to improve the light extraction efficiency. For example, the orthographic projection of each first electrode 2001 in the first conductive layer 21 on the base substrate 10 falls within the orthographic projection of the sub-third conductive layer corresponding to the first electrode 2001 on the base substrate 10. In this case, the first conductive layer 21 may be made of a transparent conductive oxide material with a high work function, such as ITO, IZO, IGZO, AZO, etc.

[0071] The light-emitting layer 2 of the pixel layer includes a first light-emitting device 201 and a second light-emitting device 202 located in a first sub-pixel region and a second sub-pixel region, respectively. The first transistor 12 drives the first light-emitting device 201 to emit light, and the second transistor 13 drives the second light-emitting device 202 to emit light. The first light-emitting device 201 and the second light-emitting device 202 both include a light-emitting unit 2003, and a first electrode 2001 and a second electrode 2002 facing the light-emitting unit 2003.

[0072] Typically, a fourth conductive layer 18 is disposed between the third conductive layer 16 and the transistor. The fourth conductive layer 18 may include a first data line 116, a second data line 117, and a first scan line 118. The first scan line 118 is connected to the gate 111, the first data line 116 is connected to the first electrode 113, and the second data line 117 is connected to the second electrode 114.

[0073] The first light emitting device 201 and the second light emitting device 202 may be organic light emitting diodes (OLEDs) or quantum dot light emitting diodes (QLEDs), etc., and the embodiment of the present disclosure does not limit the type of light emitting elements. For example, the light emitting unit 2003 may be a small molecule organic material or a polymer organic material.

[0074] The first light emitting device 201 and the second light emitting device 202 are top emission structures, and the first electrode 2001 and the second electrode 2002 are reflective. For example, the first electrode 2001 includes a material with high work function and high reflectivity to act as an anode, such as a stacked structure of Ti / Al / Ti / Mo, wherein metal titanium can be used as a buffer layer to improve the adhesion between layers, Al is used as a high reflective material, and Mo is used as a high work function material to directly contact the organic functional layer to improve the injection capacity of carriers. Correspondingly, the second conductive layer 23 acts as a cathode, for example, the second conductive layer 23 can be a transparent conductive material or a stacked structure of a transparent conductive material and a metal material. For example, the second conductive layer 23 can be a transparent metal oxide conductive material, such as indium zinc oxide (IZO), indium tin oxide (ITO), indium gallium zinc oxide (IGZO), etc., and can also be a transparent nano conductive material such as carbon nanotubes, graphene, nano silver wires, etc.

[0075] It is understandable that the first electrode 2001 of the first light emitting element is formed on the surface of the driving backplane 1 and is electrically connected to the first electrode 113 of the first transistor 12 through a contact hole 14 filled with a conductive material (such as tungsten), the plurality of third conductive layers. Figure 1 One insulating layer 15 and one third conductive layer 16 are exemplarily shown in the figure; however, the embodiment of the present disclosure does not limit the number of layers of the insulating layer 15 and the third conductive layer 16.

[0076] The display panel also includes a first encapsulation layer 3, which is arranged on the side of the second electrode away from the base substrate. A color filter layer 4 is arranged on the side of the first encapsulation layer 3 away from the base substrate. The color filter layer 4 includes a first light absorbing portion 41, and the first light absorbing portion 41 has a first opening, a second opening, and a third opening. A red filter pattern 42 is arranged in the first opening, a green filter pattern 43 is arranged in the second opening, and a blue filter pattern 44 is arranged in the third opening. The first light absorbing portion 41 may also have a fourth opening, and a white filter pattern is arranged in the fourth opening. The light emitted by the first light emitting device 201 and the second light emitting device 202 forms visible light of different colors after passing through the color filter layer 4.

[0077] The display panel further includes a second encapsulation layer 5, which is disposed on a side of the filter structure 61 away from the base substrate. The display panel further includes a microlens layer 8, which is disposed on a side of the second encapsulation layer 5 away from the base substrate and is located in the display area 100. The microlens layer 8 includes a plurality of second microlenses 82, which are bonded to the second encapsulation layer 5 through a first bonding layer 83. Visible light of different colors is converged by the plurality of second microlenses 82.

[0078] The driving backplane 1 further includes a photosensitive unit 17, which is disposed on one side of the base substrate and located in the non-display area 200 of the display panel. The photosensitive unit 17 is disposed on the same layer as the driving circuit layer. The photosensitive unit 17 can be a photodiode 17. In this example, the silicon substrate is doped (p-type doping or n-type doping) to form a second active layer 171, a third pole 172, and a fourth pole 173 of the photodiode 17, that is, the second active layer 171, the third pole 172, and the fourth pole 173 of the photodiode are located in the silicon substrate, or the second active layer 171, the third pole 172, and the fourth pole 173 of the photodiode 17 are part of the silicon substrate.

[0079] The insulating layer 15 extends to the non-display area 200 and covers the second active layer 171, the third electrode 172 and the fourth electrode 173 of the photodiode. The fourth conductive layer 18 is also provided with a third data line 174 and a fourth data line 175, which are respectively connected to the third electrode 172 and the fourth electrode 173 of the photodiode 17 through vias. In the direction away from the display area 100, the first encapsulation layer 3 extends from the surface of the second electrode 2002 to the surface of the insulating layer 15. It can be understood that the first encapsulation layer 3 covers the second electrode 2002 and the insulating layer 15.

[0080] The photosensitive unit 17 senses infrared light, so it is necessary to filter out visible light. In this embodiment, the display panel also includes a filter structure 61, which is arranged on the side of the packaging layer away from the base substrate and is located in the non-display area 200. The filter structure 61 includes a stacked red filter layer 611, a green filter layer 612 and a blue filter layer 613. The red filter layer 611 is arranged in the same layer as the color filter layer 4, the blue filter layer 613 is arranged on the side of the red filter layer 611 away from the base substrate, and the green filter layer 612 is arranged on the side of the blue filter layer 613 away from the base substrate. The orthographic projections of the red filter layer 611, the green filter layer 612 and the blue filter layer 613 on the base substrate all cover the orthographic projection of the photosensitive unit 17 on the base substrate. Visible light (380-760nm) can be filtered by the three color filter layers. Of course, other filter layers can also be used to filter out visible light, for example: only the infrared light absorption part is passed.

[0081] The thickness of the red filter layer 611 is the same as that of the color filter layer 4. Because the green filter layer 612 and the blue filter layer 613 are added, there is a step difference between the second encapsulation layer 5 and the color filter layer 4. In order to eliminate the step difference between the second encapsulation layer 5 and the color filter layer 4, and the step difference between the second encapsulation layer 5 and the first encapsulation layer 3 on the side of the filter structure 61 away from the display area 100, the display panel further includes a filling layer 7, the filling layer 7 includes a first filling portion 71 and a second filling portion 72, the first filling portion 71 is provided between the second encapsulation layer 5 and the color filter layer 4, the thickness of the first filling portion 71 is equal to the sum of the thickness of the blue filter layer 613 and the green filter layer 612, and the thickness of the first filling portion 71 is equal to the sum of the thickness of the red filter layer 611, the blue filter layer 613 and the green filter layer 612.

[0082] The display panel also includes a second light absorbing portion 62, which is arranged on the periphery of the filter structure 61. The thickness of the second light absorbing portion 62 is equal to the sum of the thicknesses of the red filter layer, the blue filter layer 613 and the green filter layer 612. The orthographic projection of the second light absorbing portion 62 on the base substrate forms an enclosing area, and the orthographic projection of the photosensitive unit 17 on the base substrate covers the enclosing area.

[0083] The microlens layer 8 also includes a plurality of optical collimation structures, which are arranged on the side of the second encapsulation layer 5 away from the base substrate and located in the non-display area 200. The orthographic projection of the optical collimation structure on the base substrate covers the orthographic projection of the photosensitive unit 17 on the base substrate, and the optical collimation structure is used to collect the infrared light reflected by the eye 500 to the surface of the photosensitive unit 17. The optical collimation structure can be a first microlens 81, and the first microlens 81 is arranged in the same layer as the second microlens 82. The first microlens 81 is bonded to the second encapsulation layer 5 through a first bonding layer 83.

[0084] The display panel further includes a second adhesive layer 84 and a cover plate 9 . The second adhesive layer 84 is disposed on a side of the microlens layer 8 away from the base substrate 10 , and the cover plate 9 is bonded to a side of the second adhesive layer 84 away from the base substrate.

[0085] like Figures 2 to 5 As shown, the non-display area 200 is in the shape of a rectangular frame arranged outside the display area 100. The non-display area 200 includes four sub-non-display areas 2001 located around the display area 100, one of the sub-non-display areas 2001 is provided with a binding circuit 19, and the remaining three sub-non-display areas 2001 are respectively provided with a group of light sensing units 17. The number of light sensing units 17 provided in one sub-non-display area 2001 is:

[0086]

[0087] Wherein, γ is the field of view angle of the eye 500 viewing the display panel, and η is the viewing angle change value.

[0088] For example, the viewing angle γ of the eye 500 viewing the display panel is 90°, the viewing angle change value η is 2°, and the number of light sensing units 17 set in a sub non-display area 2001 is 45. It should be noted that this is only an exemplary description and does not limit the number of light sensing units 17. A corresponding number of light sensing units 17 can be manufactured according to different viewing angle change values.

[0089] The angle range of the infrared light received by the light sensing unit 17 is the collimation angle, and the eye movement distance is connected to the center of the optical collimation structure to form the collimation angle of the optical collimation structure. The collimation angle is calculated by the following formula:

[0090]

[0091]

[0092] Wherein, D is the distance between the eye 500 and the light sensing unit 17 , m is the eye movement distance, w is the width of the eye movement range 5001 , and q is the number of light sensing units 17 set in a sub non-display area 2001 .

[0093] The eye movement range 5001 (Eye-Box) is a virtual frame of 8mm×8mm (industry experience value). The distance m of the eye 500 can be calculated to be 178um, and the distance D between the eye 500 and the photosensitive unit 17 is 50.009mm. The optical path adjustment lens will have a scaling effect on the size of the eye movement range 5001 and the distance D between the eye 500 and the photosensitive unit 17. After passing through the optical path adjustment lens, the distance m of the eye 500 is 591um, the distance D between the eye 500 and the photosensitive unit 17 is 60.1mm, and the collimation angle θ is 1.13°.

[0094] like Figure 6 As shown, each photosensitive unit 17 receives infrared light reflected from different eye movement distances, and the corresponding collimation angles do not overlap. It is necessary to make the ratio of the size of the photosensitive unit 17 to the size of the optical collimation structure smaller, and the photosensitive unit 17 is required to have a sensitivity to receive a smaller amount of light. Figure 7 As shown, the collimation angles corresponding to adjacent photosensitive units 17 intersect with each other, and the requirements for the ratio of the size of the photosensitive unit 17 to the size of the optical collimation structure and the sensitivity to the light flux are reduced.

[0095] like Figures 8 to 12 As shown, the theoretically calculated optimal collimation angle θ is 1.13°, but in the design stage, the maximum luminous flux should be pursued to increase the light signal received by the photosensitive unit 17. When the eye 500 observes the display panel, the size of the pupil 5002 varies between 2.5 mm and 4 mm according to the brightness. The signal difference between two adjacent photosensitive units 17 is calculated by the following formula:

[0096] ΔS=S1-S0 4);

[0097] S0=A1×α1+(A21+A22)×α2 5);

[0098] S1=B3×α1+(B21+B22)×α2 6);

[0099] Wherein, ΔS is the signal difference, S0 is the signal value of the first light sensing unit 1701, S1 is the signal value of the second light sensing unit 1702, A1 is the coverage area of ​​the collimation angle corresponding to the first light sensing unit 1701 on the pupil, A21 is the coverage area of ​​the collimation angle corresponding to the first light sensing unit 1701 on the iris on one side of the pupil, and A22 is the coverage area of ​​the collimation angle corresponding to the first light sensing unit 1701 on the iris on the other side of the pupil; B1 is the coverage area of ​​the collimation angle corresponding to the second light sensing unit 1702 on the through hole, B21 is the coverage area of ​​the collimation angle corresponding to the second light sensing unit 1702 on the iris on one side of the pupil, B22 is the coverage area of ​​the collimation angle corresponding to the second light sensing unit 1702 on the iris on the other side of the pupil, α1 is the reflectivity of the pupil to infrared light, and α2 is the reflectivity of the iris to infrared light. It can be seen from the figure that the first light sensing unit 1701 and the second light sensing unit 1702 are arranged adjacent to each other.

[0100] The collimation angle corresponding to the photosensitive unit 17 increases, so the eye movement distance becomes larger. To achieve the same viewing angle change value, the signal difference ΔS needs to be maximized so that more light flux can be reflected to the photosensitive unit 17 at the same viewing angle change value. In pursuit of maximizing the signal difference ΔS, when A1 is the size of the pupil 5002, the signal difference ΔS reaches the maximum. For the same viewing angle change value, the increase in the collimation angle can be achieved, and the theoretical optimal collimation angle is between 1.13° and 3.9°. According to calculations, the photosensitive unit 17 can receive infrared light reflected from the eye 500 at 0 to ±3.9°.

[0101] The optical collimation structure may be a first microlens 81, or a slit or hole, etc. In this embodiment, the optical collimation structure is a circular first microlens 81. After determining the size of the collimation angle, the size of the first microlens 81 and the thickness of each layer between the light sensing unit 17 and the first microlens 81 may be determined.

[0102] like Figures 1 to 3 As shown, the first microlens 81 is a circular first microlens. When the focus of the first microlens 81 is located on the surface of the photosensitive unit 17, the light signal received by the photosensitive unit 17 is the strongest. While ensuring the focal length, the curvature radius of the circular first microlens satisfies:

[0103] R=(n1×L1+......nt×Lt)×(nlens-1) 7);

[0104] In the direction away from the substrate, n1 is the refractive index of the first layer between the circular first microlens and the photosensitive unit 17, nt is the refractive index of the tth layer, L1 is the thickness of the first layer, Lt is the thickness of the tth layer, and R is the radius of curvature of the circular first microlens.

[0105] In this embodiment, for a silicon-based display panel, the insulating layer, the pixel definition layer and the base substrate are usually arranged on a silicon base, so the insulating layer, the pixel definition layer and the base substrate are made of the same material, and these layers can be considered as the first layer in formula 7). The first encapsulation layer 3 and the second encapsulation layer 5 are made of the same material, and can be considered as the second layer in formula 7), and the first adhesive layer 83 can be considered as the third layer in formula 7).

[0106] The arch height and aperture of the circular first microlens are calculated by the following formula:

[0107] R 2 =(Rd) 2 +(h / 2) 2 8);

[0108] Wherein, R is the radius of curvature of the circular first microlens, d is the aperture of the circular first microlens, and h is the arch height of the circular first microlens.

[0109] The radius of curvature of the circular first microlens can be calculated according to the material and thickness of each layer between the circular first microlens and the light sensing unit 17. By setting the arch height of the circular first microlens, the aperture of the circular first microlens can be calculated by the above formula. The setting of the arch height of the circular first microlens can be obtained from the relationship between the arch height of the first microlens and the signal amount of the light sensing unit 17.

[0110] like Figures 13 to 15 As shown, the first microlens 81 can also be set as a cylindrical first microlens, and the height of the cylindrical first microlens is greater than the diameter of the circular first microlens, so the luminous flux of the cylindrical first microlens is greater than the luminous flux of the circular first microlens. In order to achieve the sensing of converged infrared light in different directions, the multiple first microlenses are divided into two setting methods. Specifically, the multiple cylindrical first microlenses can include cylindrical first microlenses arranged along the first direction and cylindrical first microlenses arranged along the second direction, and the second direction is perpendicular to the first direction.

[0111] The four sub-non-display areas 2001 include two first sub-non-display areas 200 extending along the first direction and second sub-non-display areas 200 extending along the second direction, wherein one of the first sub-non-display areas 200 is provided with a binding circuit 19, another first sub-non-display area 200 is provided with a columnar first microlens arranged along the second direction, and two second sub-non-display areas 200 are provided with a columnar first microlens arranged along the first direction. It should be noted that the first direction is Fig.14The x direction is shown in Fig.14 The y direction is shown in FIG.

[0112] In other achievable embodiments, the cylindrical first microlenses arranged along the first direction and the cylindrical first microlenses arranged along the second direction may be arranged alternately in a cylindrical first microlens in a sub non-display area 2001. That is, the cylindrical first microlens arranged along the second direction is arranged between two adjacent cylindrical first microlenses arranged along the first direction, and the cylindrical first microlens arranged along the first direction is arranged between two adjacent cylindrical first microlenses arranged along the second direction.

[0113] Fig.16 Schematic diagram of the relationship between the arch height of the first microlens and the signal amount of the light sensing unit 17. It can be seen from the figure that when the arch height of the first microlens is about 2 microns, the signal amount of the light sensing unit 17 is the largest. When the signal intensity remains unchanged, that is, the angle range of receiving infrared light is the largest, that is, the collimation angle of the first microlens is the largest.

[0114] The present disclosure also provides a display device. Fig.17 As shown, the display device may include an optical path adjustment lens 400, an infrared light source 300, and a display panel of any one of the above embodiments of the present disclosure. The infrared light source 300 is arranged at the periphery of the lens, and the display panel is arranged on the side of the infrared light source 300 and the optical path adjustment lens 400 away from the eye 500. The specific structure and beneficial effects of the display panel have been described in detail above, so they will not be repeated here.

[0115] It should be noted that, in addition to the display panel, the display device also includes other necessary components and components, such as circuit boards, power lines, etc. Those skilled in the art may make corresponding supplements according to the specific usage requirements of the display device, which will not be elaborated here.

[0116] The display device can be a traditional electronic device, such as a mobile phone, a computer, a television, a projector, and a camcorder, or it can be an emerging wearable device, such as a VR wearable device, which are not listed here one by one. When the display device is a VR wearable device, the optical path adjustment lens 400 is a VR lens.

[0117] The disclosed embodiments also provide a method for identifying a gazed position of a display device.

[0118] like Fig.18 As shown, the method includes:

[0119] Step S10, emitting infrared light to the eyes through an infrared light source.

[0120] Step S20, when the infrared light reflected by the eye is reflected to the optical path collimation structure, if the infrared light signal amount sensed by a certain photosensitive unit is smaller than the infrared light signal amount of the photosensitive units in its surrounding area, it is determined that the pupil is looking at the position of the photosensitive unit.

[0121] When the display device is a VR wearable device, because the reflectivity difference between the pupil and the iris in the near-infrared band is large, the pupil center can be located through subsequent data processing, and then the real-time gaze point can be calculated through the pre-established mapping relationship between the pupil center and the gaze point position. There is no need for a camera to capture the image of the eye, and the gaze position of the eye can be quickly determined through the light sensing units at different positions in the non-display area. The data volume is small, the information processing time is reduced, and the response speed is improved.

[0122] Through eye tracking, the eye movement trajectory obtained can be used as a command in VR wearable devices to enhance the interactivity between the eyes and VR wearable devices. In this way, instructions can be issued through more convenient eye movements, providing stronger interactivity.

[0123] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A display panel, comprising a display area and a non-display area located outside the display area, characterized in that: The display panel further includes: substrate substrate; A plurality of optical alignment structures are disposed on one side of the base substrate and located in the non-display area; A plurality of optical convergence structures are provided on one side of the base substrate and located in the display area; A plurality of photosensitive units are disposed between the base substrate and the optical alignment structure and located in the non-display area, and the plurality of photosensitive units correspond to the plurality of optical alignment structures one by one; The optical collimation structure is used to collect the infrared light reflected by the eyes onto the surface of the photosensitive unit; The multiple optical collimating structures and the multiple optical converging structures are formed in the same layer and made of the same material.

2. The display panel according to claim 1, characterized in that: The angle range in which the light sensing unit receives infrared light is a collimation angle, and the collimation angle is calculated by the following formula: Among them, D is the distance between the eye and the photosensitive unit, m is the eye movement distance, w is the width of the eye movement range, q is the number of photosensitive units set in the sub-non-display area on one side of the display area, γ is the field of view of the eye viewing the display panel, and η is the viewing angle change value.

3. The display panel according to claim 2, characterized in that: The signal difference between two adjacent light sensing units is calculated using the following formula: ΔS=S1-S0 4); S0=A1×α1+(A21+A22)×α2 5); S1=B3×α1+(B21+B22)×α2 6); Among them, ΔS is the signal difference, S0 is the signal value of the first photosensitive unit, S1 is the signal value of the second photosensitive unit, A1 is the coverage area of ​​the collimation angle corresponding to the first photosensitive unit on the pupil, A21 is the coverage area of ​​the collimation angle corresponding to the first photosensitive unit on the iris on one side of the pupil, and A22 is the coverage area of ​​the collimation angle corresponding to the first photosensitive unit on the iris on the other side of the pupil; B1 is the coverage area of ​​the collimation angle corresponding to the second photosensitive unit on the through hole, B21 is the coverage area of ​​the collimation angle corresponding to the second photosensitive unit on the iris on one side of the pupil, B22 is the coverage area of ​​the collimation angle corresponding to the second photosensitive unit on the other side of the pupil, α1 is the reflectivity of the pupil to infrared light, and α2 is the reflectivity of the iris to infrared light.

4. The display panel according to claim 3, characterized in that: The coverage area of ​​the first light sensing unit on the pupil at the collimation angle is equal to the size of the pupil.

5. The display panel according to claim 4, characterized in that: The collimation angle is between 1.13 degrees and 3.9 degrees.

6. The display panel according to claim 1, characterized in that: The optical collimation structure is a first microlens, and the focus of the first microlens is located on the surface of the photosensitive unit.

7. The display panel according to claim 6, characterized in that: The first microlens is a circular first microlens and / or a cylindrical first microlens, and the height of the cylindrical first microlens is greater than the diameter of the circular first microlens.

8. The display panel according to claim 7, characterized in that: The first microlens is a circular first microlens, and the radius of curvature of the circular first microlens satisfies: R=(n1×L1+......nt×Lt)×(nlens-1) 7); In the direction away from the base substrate, n1 is the refractive index of the first layer between the first microlens and the photosensitive unit, nt is the refractive index of the tth layer, L1 is the thickness of the first layer, Lt is the thickness of the tth layer, and R is the radius of curvature of the circular first microlens.

9. The display panel according to claim 1, characterized in that: The display panel further comprises a filter structure, wherein the filter structure is arranged between the optical collimation structure and the light sensing unit, and the filter structure comprises a red filter layer, a green filter layer and a blue filter layer which are stacked.

10. The display panel according to claim 9, characterized in that: The display panel further includes a second light absorbing portion, which is disposed at the periphery of the filter structure. The orthographic projection of the second light absorbing portion on the base substrate forms an enclosing area, and the orthographic projection of the photosensitive unit on the base substrate covers the enclosing area.

11. The display panel according to claim 6, characterized in that: The first microlens is a columnar first microlens, including a columnar first microlens arranged along a first direction and a columnar first microlens arranged along a second direction, and the second direction is perpendicular to the first direction.

12. The display panel according to claim 1, characterized in that: The non-display area includes four sub-non-display areas located around the display area, one of the sub-non-display areas is provided with a binding circuit, and the remaining three sub-non-display areas are respectively provided with a group of the light sensing units.

13. The display panel according to claim 1, characterized in that: The display panel further includes a driving circuit layer, and the light sensing unit is arranged in the same layer as the driving circuit layer.

14. A display device, characterized in that: include: Optical path adjustment lens; An infrared light source is disposed at the periphery of the lens; The display panel according to any one of claims 1 to 13, wherein the display panel is arranged on a side of the infrared light source and the optical path adjustment lens away from the eye.

15. A method for identifying a gazed position of a display device according to claim 14, characterized in that: The method comprises: Send infrared light to the eyes through an infrared light source; When the infrared light reflected by the eye is reflected to the optical path collimation structure, if the infrared light signal amount sensed by a certain photosensitive unit is smaller than the infrared light signal amount of the photosensitive units in its surrounding area, it is determined that the pupil is looking at the position of the photosensitive unit.

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