Display panel and control method thereof

Abstract

The invention provides a display panel and a control method thereof. The display panel comprises a substrate, a first electrode layer, a second electrode layer and a plurality of pixel units, the first electrode layer is located on the substrate and comprises a first sub-electrode and a second sub-electrode; the second electrode layer is located on the side, away from the substrate, of the first electrode layer; each pixel unit comprises a plurality of light-emitting elements and at least one light-absorbing element, the plurality of light-emitting elements are located between the first sub-electrode and the second electrode layer, and the at least one light-absorbing element is located between the second sub-electrode and the second electrode layer; the light emitting direction of the display panel is a first direction, and the light absorption element comprises at least two sub light absorption elements which are arranged in a stacked mode in the first direction.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to a display panel and a control method thereof. Background Art

[0002] In the related art, screen anti-peeping can be achieved by attaching an anti-peeping film. This solution blocks lateral light, so that the content displayed on the screen can only be clearly seen from the front of the screen, effectively protecting the privacy of users when using mobile phones or other display devices. However, this solution has many disadvantages, such as it cannot achieve full-angle anti-peeping, reduces the screen brightness, affects color and touch response, increases eye fatigue, and affects the visual experience, etc.

[0003] The above information disclosed in this part is only used for understanding the background of the inventive concept of the present disclosure. Therefore, the above information may include information that does not constitute the prior art. Summary of the Invention

[0004] In one aspect, a display panel is provided. The display panel includes a substrate, a first electrode layer, a second electrode layer, and a plurality of pixel units; the first electrode layer is located on the substrate, and the first electrode layer includes a first sub-electrode and a second sub-electrode; the second electrode layer is located on a side of the first electrode layer away from the substrate; the pixel unit includes a plurality of light-emitting elements and at least one light-absorbing element, the plurality of light-emitting elements are located between the first sub-electrode and the second electrode layer, and the at least one light-absorbing element is located between the second sub-electrode and the second electrode layer; wherein, the light-emitting direction of the display panel is a first direction, and the light-absorbing element includes at least two sub-light-absorbing elements stacked along the first direction.

[0005] According to some exemplary embodiments, the sub-light-absorbing element includes a light-absorbing portion and a carrier transport portion located on a side of the light-absorbing portion close to the substrate.

[0006] According to some exemplary embodiments, the at least two sub-light-absorbing elements include a first light-absorbing portion and a second light-absorbing portion; and the first light-absorbing portion and the second light-absorbing portion are configured to absorb light of the same wavelength band; or, the first light-absorbing portion is configured to absorb light of a first color, and the second light-absorbing portion is configured to absorb complementary light of the light of the first color; or, the bandgap width of the material of the first light-absorbing portion is greater than the bandgap width of the material of the second light-absorbing portion.

[0007] According to some exemplary embodiments, the plurality of light-emitting elements include a first light-emitting element, a second light-emitting element, and a third light-emitting element, the first light-emitting element is configured to emit light of a first color, the second light-emitting element is configured to emit light of a second color, and the third light-emitting element is configured to emit light of a third color.

[0008] According to some exemplary embodiments, the at least one light-absorbing element includes a first light-absorbing element; and the first light-absorbing element is configured to absorb the mixed light of the first color, the second color, and the third color, and the first light-absorbing element is located between two adjacent light-emitting elements; alternatively, the first light-absorbing element is configured to absorb the mixed light of the first color and the second color, and the first light-absorbing element is disposed adjacent to the first light-emitting element or the second light-emitting element; alternatively, the first light-absorbing element is configured to absorb the mixed light of the first color and the third color, and the first light-absorbing element is disposed adjacent to the first light-emitting element or the third light-emitting element; alternatively, the first light-absorbing element is configured to absorb the mixed light of the second color and the third color, and the first light-absorbing element is disposed adjacent to the second light-emitting element or the third light-emitting element; alternatively, the first light-absorbing element is configured to absorb the light of the first color, and the first light-absorbing element is disposed adjacent to the first light-emitting element; alternatively, the first light-absorbing element is configured to absorb the light of the second color, and the first light-absorbing element is disposed adjacent to the second light-emitting element; alternatively, the first light-absorbing element is configured to absorb the light of the third color, and the first light-absorbing element is disposed adjacent to the third light-emitting element.

[0009] According to some exemplary embodiments, the at least one light-absorbing element includes a first light-absorbing element and a second light-absorbing element; and the first light-absorbing element is configured to absorb light of the first color, the second light-absorbing element is configured to absorb light of the second color, the first light-absorbing element is disposed adjacent to the first light-emitting element, and the second light-absorbing element is disposed adjacent to the second light-emitting element; or, the first light-absorbing element is configured to absorb light of the first color, the second light-absorbing element is configured to absorb light of the third color, the first light-absorbing element is disposed adjacent to the first light-emitting element, and the second light-absorbing element is disposed adjacent to the third light-emitting element; or, the first light-absorbing element is configured to absorb light of the second color, the second light-absorbing element is configured to absorb light of the third color, the first light-absorbing element is disposed adjacent to the second light-emitting element, and the second light-absorbing element is disposed adjacent to the third light-emitting element; or, the first light-absorbing element is configured to absorb the mixed light of the first color and the second color, the second light-absorbing element is configured to absorb light of the third color, the first light-absorbing element is disposed adjacent to the first light-emitting element or the second light-emitting element, and the second light-absorbing element is disposed adjacent to the third light-emitting element; or, the first light-absorbing element is configured to absorb the mixed light of the first color and the third color, the second light-absorbing element is configured to absorb light of the second color, the first light-absorbing element is disposed adjacent to the first light-emitting element or the third light-emitting element, and the second light-absorbing element is disposed adjacent to the second light-emitting element; or, the first light-absorbing element is configured to absorb the mixed light of the second color and the third color, the second light-absorbing element is configured to absorb light of the first color, the first light-absorbing element is disposed adjacent to the second light-emitting element or the third light-emitting element, and the second light-absorbing element is disposed adjacent to the first light-emitting element.

[0010] According to some exemplary embodiments, the at least one light-absorbing element includes a first light-absorbing element, a second light-absorbing element, and a third light-absorbing element, the first light-absorbing element is configured to absorb light of the first color, the second light-absorbing element is configured to absorb light of the second color, and the third light-absorbing element is configured to absorb light of the third color; and the first light-absorbing element is disposed adjacent to the first light-emitting element, the second light-absorbing element is disposed adjacent to the second light-emitting element, and the third light-absorbing element is disposed adjacent to the third light-emitting element.

[0011] According to some exemplary embodiments, the light-emitting element further includes a plurality of sub-light-emitting elements stacked along the first direction and a charge generation layer located between two adjacent sub-light-emitting elements.

[0012] According to some exemplary embodiments, the plurality of sub-light-emitting elements stacked along the first direction include a first sub-light-emitting element disposed on a side of the charge generation layer close to the substrate and a second sub-light-emitting element disposed on a side of the charge generation layer away from the substrate; the at least two sub-light-absorbing elements stacked along the first direction include a first sub-light-absorbing element and a second sub-light-absorbing element; and the first sub-light-absorbing element is disposed on the same layer as the first sub-light-emitting element, and the second sub-light-absorbing element is disposed on the same layer as the second sub-light-emitting element.

[0013] In another aspect, a method for controlling a display panel is provided. The method includes: obtaining a current value generated by a light-absorbing element of the display panel; determining whether there is an intruder heat source other than the user heat source in an environment where the display panel is located according to the current value; and in response to the presence of the intruder heat source in the environment, controlling the display panel to display a warning message, and / or controlling the display panel to be adjusted to a privacy display mode visible only to the user. Description of the Drawings

[0014] Other objects and advantages of the present disclosure will become apparent and can help to have a comprehensive understanding of the present disclosure through the description of the present disclosure with reference to the accompanying drawings below.

[0015] Figure 1 Schematically shows a structural schematic diagram of a display panel in the related art.

[0016] Figure 2 Schematically shows an absorption spectrum diagram of a semiconductor material in the related art.

[0017] Figure 3 Schematically shows a structural schematic diagram of a display panel according to some embodiments of the present disclosure.

[0018] Figures 4a to 4g Schematically shows a partial schematic diagram of each component in the manufacturing process flow of a display panel according to some embodiments of the present disclosure.

[0019] Figure 5 Schematically shows an absorption spectrum diagram of a stacked material according to some embodiments of the present disclosure.

[0020] Figures 6a to 6g Schematically shows a distribution schematic diagram of a first light-absorbing element according to some embodiments of the present disclosure.

[0021] Figures 7a to 7f Schematically shows a distribution schematic diagram of a first light-absorbing element and a second light-absorbing element according to some embodiments of the present disclosure.

[0022] Figure 8Schematically shows a distribution schematic diagram of a first light-absorbing element, a second light-absorbing element, and a third light-absorbing element according to some embodiments of the present disclosure.

[0023] Figure 9 Schematically shows a structural schematic diagram of a display panel according to some embodiments of the present disclosure.

[0024] Figure 10 Schematically shows a flowchart of a control method for a display panel according to some embodiments of the present disclosure.

[0025] Figure 11 Schematically shows a current-voltage curve diagram of a display panel according to some embodiments of the present disclosure. Detailed implementation manners

[0026] In the following description, for the purpose of explanation, numerous specific details are set forth to provide a thorough understanding of various exemplary embodiments. However, it is obvious that various exemplary embodiments can be implemented without these specific details or with one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, configurations, and characteristics of an exemplary embodiment can be used or implemented in another exemplary embodiment.

[0027] In the drawings, for the purpose of clarity and / or description, the sizes and relative sizes of elements can be enlarged. Thus, the sizes and relative sizes of the respective elements do not have to be limited to the sizes and relative sizes shown in the figures. When an exemplary embodiment can be implemented differently, the specific process sequence can be executed in a different order from the described order. For example, two consecutively described processes can be executed substantially simultaneously or in an order opposite to the described order. In addition, the same reference numerals denote the same elements.

[0028] When an element is described as "on" another element, "connected to" another element, or "coupled to" another element, the element can be directly on the other element, directly connected to the other element, or directly coupled to the other element, or there can be an intermediate element. However, when an element is described as "directly on" another element, "directly connected to" another element, or "directly coupled to" another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between" versus "directly between", "adjacent" versus "directly adjacent", or "on" versus "directly on", etc. In addition, the term "connection" can refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection.

[0029] It should be understood that although terms such as first and second may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the exemplary embodiments, the first element may be named the second element, and similarly, the second element may be named the first element.

[0030] It can be understood that placing the infrared sensor under the screen can also effectively ensure the non-disclosure of personal information. Specifically, when the user is reading the screen information, the heat source can be locked. Once a new heat source is detected, the infrared sensor senses the change in the heat source temperature and transmits the sensed signal to the screen circuit controller. The screen circuit controller changes the current and voltage of the backlight, thereby changing the light output angle and intensity of the backlight source, so as to achieve the anti-peeping effect. However, placing the infrared sensor under the screen will affect the characteristics of the thin film transistors in the display panel after a long time; moreover, the infrared sensor can only perform local monitoring and cannot achieve full-screen detection; in addition, the sensitivity of the infrared sensor is insufficient, and it can only be activated when the photocurrent reaches about 10 -8 A.

[0031] Figure 1 is a schematic structural diagram of a display panel in the related art. Figure 2 is an absorption spectrum diagram of a semiconductor material in the related art.

[0032] Referring to Figure 1 , in the related art, the display panel includes a substrate 10, a first electrode layer 20, a second electrode layer 30, and a plurality of pixel units 40. The first electrode layer 20 is located on the substrate 10, and the first electrode layer 20 includes a first sub-electrode 201 and a second sub-electrode 202. The second electrode layer 30 is located on the side of the first electrode layer 20 away from the substrate 10. The pixel unit 40 includes a plurality of light-emitting elements (such as a first light-emitting element 401, a second light-emitting element 402, and a third light-emitting element 403) and a light-absorbing element 404. The plurality of light-emitting elements are located between the first sub-electrode 201 and the second electrode layer 30, and a light-absorbing element 404 is located between the second sub-electrode 202 and the second electrode layer 30. Among them, the light-absorbing element 404, the second sub-electrode 202, and the second electrode layer 30 form an Organic Photo Diode (OPD) for realizing full-screen fingerprint recognition.

[0033] Specifically, the light-absorbing element 404 is used to absorb the light incident into the display panel (for example, the light emitted by the light-emitting element and reflected by the finger and then incident into the display panel), generating photo-generated carriers. Photo-generated carriers are a combination of electrons and holes, that is, electron-hole pairs. The photo-generated electrons move towards the n-type semiconductor (i.e., the second electrode layer 30) under the action of the built-in electric field of the space charge layer, while the photo-generated holes move towards the p-type semiconductor (i.e., the second sub-electrode 202), thereby generating a current. After this current reaches the set threshold, the corresponding connected sensing circuit starts to work under the action of the current, and then realizes the function of in-screen optical recognition and scanning.

[0034] It should be noted that the measurement index of the light-absorbing element 404 is the absorption spectrum. The absorption spectrum refers to the spectrum generated when a substance absorbs photons and makes a transition from a low energy level to a high energy level. Ultraviolet-visible absorption condition: hv≥ΔE = E e -E g . Where h is Planck's constant, v is the photon frequency, E e and E g are the energies of the excited state and the ground state respectively. That is, the light acting on the system can only be absorbed when its energy is equal to or greater than the energy difference between the two states before and after the electron transition.

[0035] According to the light absorption principle, any light-absorbing material can only absorb light in a certain wavelength band (for example, red light R (630 - 760 nm), green light G (510 - 580 nm), blue light B (435 - 510 nm)), and the absorption values of any light-absorbing material for R, G, and B are different. Specifically, as Figure 2 shown, control groups 1 to 10 represent 10 different light-absorbing materials, and the absorption intensity of each light-absorbing material for light of different wavelengths is different. Therefore, the light-absorbing element 404 formed by using one light-absorbing material has different sensitivities to different lights. For example, a certain light-absorbing material is more sensitive to R, may absorb more R, and less G and B, resulting in uneven color of the absorbed light and poor color imaging effect. Therefore, to solve at least one aspect of the above technical problems, the embodiments of the present disclosure provide a display panel and its control method, which are beneficial to improving the problem that the light-absorbing element 404 has different sensitivities to different lights and poor color imaging effect, and achieving the balance of full-screen fingerprint recognition and full-screen infrared dynamic anti-peeping.

[0036] Figure 3 is a schematic structural diagram of a display panel according to some embodiments of the present disclosure. Figures 4a to 4g is a partial schematic diagram of each component in the preparation process flow of a display panel according to some embodiments of the present disclosure. Figure 5 is an absorption spectrum diagram of a stacked material according to some embodiments of the present disclosure.

[0037] Reference Figure 3 , the display panel includes a substrate 10, a first electrode layer 20, a second electrode layer 30, and a plurality of pixel units 40. The first electrode layer 20 is located on the substrate 10. The first electrode layer 20 includes a first sub-electrode 201 and a second sub-electrode 202. Between the first sub-electrode 201 and the second sub-electrode 202, and between adjacent first sub-electrodes 201, they are insulated from each other. The second electrode layer 30 is located on the side of the first electrode layer 20 away from the substrate 10. The pixel unit 40 includes a plurality of light-emitting elements and at least one light-absorbing element 404, Figure 3 In Figure 3 , the pixel unit 40 including a first light-emitting element 401, a second light-emitting element 402, a third light-emitting element 403, and a light-absorbing element 404 is illustrated as an example. The embodiments of the present disclosure are not limited thereto. In other embodiments, the pixel unit 40 may also include more or fewer light-emitting elements, and may also include more light-absorbing elements 404. The plurality of light-emitting elements are located between the first sub-electrode 201 and the second electrode layer 30, and at least one light-absorbing element 404 is located between the second sub-electrode 202 and the second electrode layer 30. Wherein, the light-emitting direction of the display panel is the first direction X, and the light-absorbing element 404 includes at least two sub-light-absorbing elements stacked along the first direction X, Figure 3 In Figure 3 , the light-absorbing element 404 including a first sub-light-absorbing element 41 and a second sub-light-absorbing element 42 is illustrated as an example. The embodiments of the present disclosure are not limited thereto. In other embodiments, the light-absorbing element 404 may also include more sub-light-absorbing elements.

[0038] It can be understood that in this embodiment, by making the light-absorbing element 404 include at least two sub-light-absorbing elements stacked, one of the sub-light-absorbing elements can be used to absorb RGB to achieve full-screen fingerprint recognition; another sub-light-absorbing element can be used to absorb infrared light to achieve the full-screen infrared dynamic anti-peeping function. Therefore, no additional accessories need to be added above the screen, which does not affect the use experience, and can achieve full-screen detection without dead angles. The at least two sub-light-absorbing elements can also be both made of a light-absorbing material that is sensitive to both infrared light and RGB, and the light-absorbing effect is better than that of only setting one sub-light-absorbing element. The at least two sub-light-absorbing elements can also be made of materials with different light-absorbing abilities for infrared light or RGB respectively, so as to achieve complementarity of the absorbed light colors and improve the problems that the light-absorbing element 404 has different sensitivities to different lights and poor color imaging effects.

[0039] It should be noted that a barrier element can be provided between the light-absorbing element 404 and the light-emitting element to prevent the light emitted by the light-emitting element from being directly absorbed by the light-absorbing element 404, thereby affecting the light-absorbing element 404 from absorbing the light incident from the outside. There can also be a certain distance between adjacent two light-emitting elements to avoid mutual influence.

[0040] In some embodiments of the present disclosure, the display panel further includes a hole transport layer 50 (Hole Transport Layer, abbreviated as HTL). The hole transport layer 50 can be located between the first electrode layer 20 and the light-emitting element, and is used to improve the hole injection and transport balance of the display panel, thereby improving the device efficiency and lifespan.

[0041] In some embodiments of the present disclosure, the display panel further includes an electron transport layer 60 (Electronic Transfer Layer, abbreviated as ETL). The electron transport layer 60 can be located between the second electrode layer 30 and the light-emitting element, and is used to achieve efficient electron transport. The material of the electron transport layer 60 can be lithium 8-hydroxyquinoline (8-Hydroxyquinoline Lithium, abbreviated as Liq).

[0042] In some embodiments of the present disclosure, the display panel further includes a hole-blocking layer (Hole-Blocking Layer, abbreviated as HBL). The hole-blocking layer can be located between the light-emitting element and the electron transport layer 60, and is used to block the injection of holes, thereby improving the stability of the device.

[0043] It can be understood that in this embodiment, the size of the microcavity can be adjusted by adjusting the thickness of the HTL / ETL / HBL, and the wavelength distribution and intensity distribution of the light emitted by the light-emitting element can be adjusted, so as to achieve precise control of the color coordinate (CIE) value and optimize the color purity and brightness of the device.

[0044] In some embodiments of the present disclosure, the display panel further includes a functional layer 70. The functional layer 70 is located between the electron transport layer 60 and the second electrode layer 30. The material of the functional layer 70 is, for example, ytterbium (Yttrium, abbreviated as Yb), and the functional layer 70 is used to improve the performance of the display panel.

[0045] In some embodiments of the present disclosure, the display panel further includes a protective layer 80, which is used to prevent the display panel from being cracked by ultraviolet aging, thereby extending the service life.

[0046] In some embodiments of the present disclosure, the sub-absorbing element includes an absorbing portion and a carrier transport portion located on the side of the absorbing portion close to the substrate 10. Specifically, the absorbing portion is used to absorb the light incident into the display panel and generate photo-generated carriers, and the carrier transport portion is used to assist the transport of carriers, so that the carriers are transported faster. Exemplarily, as Figure 3 shown, the first sub-absorbing element 41 includes a first absorbing portion 412 and a first carrier transport portion 411 located on the side of the first absorbing portion 412 close to the substrate 10, and the second sub-absorbing element 42 includes a second absorbing portion 422 and a second carrier transport portion 421 located on the side of the second absorbing portion 422 close to the substrate 10.

[0047] In some embodiments of the present disclosure, Figure 3 As shown, at least two sub-light absorbing elements include a first light absorbing portion 412 and a second light absorbing portion 422, and the first light absorbing portion 412 and the second light absorbing portion 422 are used to absorb light of the same wavelength band. That is, the first light absorbing portion 412 and the second light absorbing portion 422 can be formed of the same light absorbing material and are sensitive to light of the same wavelength band, which is equivalent to two identical light absorbing portions connected in series, and the absorption intensity of the light of the same wavelength band is increased, thereby improving the light absorption effect.

[0048] It should be noted that the first light absorbing portion 412 and the second light absorbing portion 422 can be made of a light absorbing narrow bandgap material, which can sensitively capture other external heat sources (infrared light) to achieve a better anti-peeping effect. For example, the material of the first light absorbing portion 412 and the second light absorbing portion 422 can be selected from porphine dyes, indium tin oxide (ITO), gallium nitride (GaN), etc.

[0049] In some embodiments of the present disclosure, Figure 3 As shown, at least two sub-light absorbing elements include a first light absorbing portion 412 and a second light absorbing portion 422, wherein the first light absorbing portion 412 is used to absorb light of a first color, and the second light absorbing portion 422 is used to absorb complementary light of the first color. Complementary light means that two colors of light can produce white light after mixing, for example, the first light absorbing portion 412 is used to absorb red light R, and the second light absorbing portion 422 is used to absorb cyan light C (i.e., a mixture of green light G and blue light B), thereby achieving complementary absorption wavelengths of the RGB bands.

[0050] In some embodiments of the present disclosure, Figure 3 As shown, at least two sub-light absorbing elements include a first light absorbing portion 412 and a second light absorbing portion 422. The band gap width of the material of the first light absorbing portion 412 is greater than the band gap width of the material of the second light absorbing portion 422. For example, the first light absorbing portion 412 is a light absorbing wide band gap material, and the second light absorbing portion 422 is a light absorbing narrow band gap material. The band gap width (also called the forbidden band width) refers to the energy difference between the maximum value of the valence band (the top of the valence band) and the minimum value of the conduction band (the bottom of the conduction band). The band gap width determines whether the material can absorb light within a specific wavelength range. Specifically, the smaller the band gap, the lower the photon energy that the material can absorb, and the corresponding wavelength is longer. Therefore, the light absorbing narrow band gap material can absorb longer wavelengths, such as infrared light, while the light absorbing wide band gap material can absorb shorter wavelength light, such as visible light or ultraviolet light. In this embodiment, both the first light absorbing portion 412 with a wide band gap and the second light absorbing portion 422 with a narrow band gap are provided, so that both long-wavelength light and short-wavelength light can be taken into account, thereby expanding the absorption spectrum range of the light absorbing element 404.

[0051] It should be noted that Figure 3Taking the example where the first light-absorbing part 412 is located between the second light-absorbing part 422 and the substrate 10, the embodiments of the present disclosure are not limited thereto. In other embodiments, the positions of the second light-absorbing part 422 and the first light-absorbing part 412 can be interchanged, that is, the second light-absorbing part 422 is disposed between the first light-absorbing part 412 and the substrate 10. The first light-absorbing part 412 and the second light-absorbing part 422 can be spaced apart by a charge generation layer 90. The charge generation layer 90 includes a P-type charge generation layer 902 and an N-type charge generation layer 901. The P-type charge generation layer 902 is located on the side of the N-type charge generation layer 901 away from the substrate 10.

[0052] In some embodiments of the present disclosure, the materials of the first light-absorbing part 412 and the second light-absorbing part 422 can be selected from perovskite, silicon (Si), copper indium gallium selenide (CIGS), etc. Taking the perovskite material as an example, the molecular formula is ABX3, and the perovskite material has the characteristic of adjustable bandgap. Specifically, other organic cations can be used to replace the A-site cation MA+. The replacement of the A-site cation changes the bond length and bond angle of the B-X-B bond, thereby changing the bandgap. The B-X bond can also be adjusted. For example, when part of Pb in CH3NH3PbI3 2+ is replaced by Sn 2+ , the bandgap is reduced from 1.55 eV to 1.17 eV. The atomic ratio in ABX3 can also be changed to adjust the relative content of different elements in the compound, so as to change the bandgap. For example, the molecular formula of the perovskite material is RNH3BY 3-x X x , where R is C n H 2n+1 , X and Y are halogen elements (such as Cl, Br, I, etc.), and B is Pb, Sn, etc. The perovskite material can be synthesized in one step by co-evaporation. The equation is RNH3X + BY → RNH3BY 3-x X x . This reaction has no by-products and only generates RNH3BY 3-x X x . By controlling the ratio of X to Y, the bandgap can be increased from 1.15 eV to 3.1 eV, and the maximum absorption wavelength can range from 300 nm to 1100 nm.

[0053] In some embodiments of the present disclosure, as Figure 3 shown, multiple light-emitting elements include a first light-emitting element 401, a second light-emitting element 402, and a third light-emitting element 403. The first light-emitting element 401 is used to emit light of a first color (such as red light R), the second light-emitting element 402 is used to emit light of a second color (such as green light G), and the third light-emitting element 403 is used to emit light of a third color (such as blue light B).

[0054] Exemplarily, as Figure 3 shown, the first light-emitting element 401 includes a first light-emitting portion 4012 and a red light carrier transport portion 4011 located on the side of the first light-emitting portion 4012 close to the substrate 10. That is, the first light-emitting portion 4012 is used to emit red light, and the red light carrier transport portion 4011 is used to assist in the transport of red light carriers, making the transport of red light carriers faster. The second light-emitting element 402 includes a second light-emitting portion 4022 and a green light carrier transport portion 4021 located on the side of the second light-emitting portion 4022 close to the substrate 10. That is, the second light-emitting portion 4022 is used to emit green light, and the green light carrier transport portion 4021 is used to assist in the transport of green light carriers, making the transport of green light carriers faster. The third light-emitting element 403 includes a third light-emitting portion 4032 and a blue light carrier transport portion 4031 located on the side of the third light-emitting portion 4032 close to the substrate 10. That is, the third light-emitting portion 4032 is used to emit blue light, and the blue light carrier transport portion 4031 is used to assist in the transport of blue light carriers, making the transport of blue light carriers faster.

[0055] With reference to Figure 3 and Figures 4a to 4g , in some embodiments of the present disclosure, in the manufacturing process flow of the display panel, first, a driving circuit layer can be formed on one side of the substrate 10, and then a first electrode layer 20 is formed on the side of the driving circuit layer away from the substrate 10. The first electrode layer 20 is electrically connected to the driving circuit layer. Next, as Figure 4a shown, a hole transport layer 50 is formed on the side of the first electrode layer 20 away from the substrate 10. As Figure 4b shown, the second light-emitting element 402 is formed on the side of the hole transport layer 50 away from the substrate 10. As Figure 4c shown, the third light-emitting element 403 is formed on the side of the hole transport layer 50 away from the substrate 10. As Figure 4d shown, the first light-emitting element 401 is formed on the side of the hole transport layer 50 away from the substrate 10. Then, as Figure 4e shown, a first sub-absorbing element 41 is formed on the side of the hole transport layer 50 away from the substrate 10. As Figure 4f shown, a second sub-absorbing element 42 is formed on the side of the first sub-absorbing element 41 away from the substrate 10, obtaining a component as Figure 4g shown. Then, an electron transport layer 60, a functional layer 70, a second electrode layer 30, and a protective layer 80 are further formed on the component as Figure 4g shown.

[0056] It should be noted that the preparation order of the first light-emitting element 401, the second light-emitting element 402, and the third light-emitting element 403 can be interchanged. For example, in other embodiments, the first light-emitting element 401 can also be formed first, and then the second light-emitting element 402 and the third light-emitting element 403 are formed. The embodiments of the present disclosure are not limited thereto.

[0057] Reference Figure 5 , the abscissa represents the wavelength (nm), the ordinate represents the absorption intensity (a.u.), curve a represents the absorption spectrum of the first material, curve b represents the absorption spectrum of the second material, and curve c represents the absorption spectrum of the third material. As can be seen from Figure 5 , the first material has a strong absorption ability for light around 530 nm, the second material has a strong absorption ability for light between 580 nm and 620 nm, and the third material has a strong absorption ability for light around 700 nm. Therefore, in this embodiment, one of these three materials can be selected for the first light-absorbing portion 412, and another one of these three materials can be selected for the second light-absorbing portion 422 to expand the absorption spectrum range of the light-absorbing element 404. In other embodiments, a third light-absorbing portion can also be added, and the first light-absorbing portion 412, the second light-absorbing portion 422, and the third light-absorbing portion can respectively select one of these three materials, so as to further expand the absorption spectrum range of the light-absorbing element 404.

[0058] Figures 6a to 6g is a schematic diagram of the distribution of the first light-absorbing element 4041 according to some embodiments of the present disclosure. Figures 7a to 7f is a schematic diagram of the distribution of the first light-absorbing element 4041 and the second light-absorbing element 4042 according to some embodiments of the present disclosure. Figure 8 is a schematic diagram of the distribution of the first light-absorbing element 4041, the second light-absorbing element 4042, and the third light-absorbing element 4043 according to some embodiments of the present disclosure.

[0059] Reference Figure 6a , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (that is, only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is used to absorb the mixed light of the first color, the second color, and the third color (such as R+G+B). The first light-absorbing element 4041 is located between two adjacent light-emitting elements, Figure 6a which is illustrated by taking the first light-absorbing element 4041 located between the first light-emitting element 401 and the second light-emitting element 402 as an example in

[0060] Reference Figure 6b, in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (i.e., only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is used to absorb the mixed light of the first color and the second color (e.g., R+G). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401 or the second light-emitting element 402, Figure 6b In the figure, the case where the first light-absorbing element 4041 is located between the first light-emitting element 401 and the second light-emitting element 402 is taken as an example for illustration. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the second light-emitting element 402 and the third light-emitting element 403, or between the first light-emitting element 401 and the third light-emitting element 403.

[0061] Refer to Figure 6c , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (i.e., only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is used to absorb the mixed light of the first color and the third color (e.g., R+B). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401 or the third light-emitting element 403, Figure 6c In the figure, the case where the first light-absorbing element 4041 is located between the first light-emitting element 401 and the third light-emitting element 403 is taken as an example for illustration. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the second light-emitting element 402, or between the second light-emitting element 402 and the third light-emitting element 403.

[0062] Refer to Figure 6d , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (i.e., only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is used to absorb the mixed light of the second color and the third color (e.g., G+B). The first light-absorbing element 4041 is disposed adjacent to the second light-emitting element 402 or the third light-emitting element 403, Figure 6d In the figure, the case where the first light-absorbing element 4041 is located between the second light-emitting element 402 and the third light-emitting element 403 is taken as an example for illustration. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the second light-emitting element 402, or between the first light-emitting element 401 and the third light-emitting element 403.

[0063] Refer to Figure 6e, in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (i.e., only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is configured to absorb light of a first color (e.g., R). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401, Figure 6e In the figure, the case where the first light-absorbing element 4041 is located between the first light-emitting element 401 and the third light-emitting element 403 is illustrated as an example. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the second light-emitting element 402.

[0064] Refer to Figure 6f , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (i.e., only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is configured to absorb light of a second color (e.g., G). The first light-absorbing element 4041 is disposed adjacent to the second light-emitting element 402, Figure 6f In the figure, the case where the first light-absorbing element 4041 is located between the first light-emitting element 401 and the second light-emitting element 402 is illustrated as an example. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the second light-emitting element 402 and the third light-emitting element 403.

[0065] Refer to Figure 6g , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 (i.e., only one light-absorbing element is provided in one pixel unit 40). The first light-absorbing element 4041 is configured to absorb light of a third color (e.g., B). The first light-absorbing element 4041 is disposed adjacent to the third light-emitting element 403, Figure 6g In the figure, the case where the first light-absorbing element 4041 is located between the second light-emitting element 402 and the third light-emitting element 403 is illustrated as an example. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the third light-emitting element 403.

[0066] Refer to Figure 7a , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 and a second light-absorbing element 4042 (i.e., two light-absorbing elements are provided in one pixel unit 40). The first light-absorbing element 4041 is configured to absorb light of a first color (e.g., R), and the second light-absorbing element 4042 is configured to absorb light of a second color (e.g., G). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401, and the second light-absorbing element 4042 is disposed adjacent to the second light-emitting element 402, Figure 7aTaking the first light absorption element 4041 being located between the first light emitting element 401 and the third light emitting element 403, and the second light absorption element 4042 being located between the first light emitting element 401 and the second light emitting element 402 as an example for illustration, the embodiments of the present disclosure are not limited thereto. In other embodiments, the first light absorption element 4041 may also be located between the first light emitting element 401 and the second light emitting element 402, and the second light absorption element 4042 may also be located between the second light emitting element 402 and the third light emitting element 403.

[0067] Referring to Figure 7b , in some embodiments of the present disclosure, at least one light absorption element 404 includes a first light absorption element 4041 and a second light absorption element 4042 (that is, two light absorption elements are provided in one pixel unit 40). The first light absorption element 4041 is used to absorb light of the first color (such as R), and the second light absorption element 4042 is used to absorb light of the third color (such as B). The first light absorption element 4041 is disposed adjacent to the first light emitting element 401, and the second light absorption element 4042 is disposed adjacent to the third light emitting element 403. Figure 7b Taking the first light absorption element 4041 being located between the first light emitting element 401 and the third light emitting element 403, and the second light absorption element 4042 being located between the second light emitting element 402 and the third light emitting element 403 as an example for illustration, the embodiments of the present disclosure are not limited thereto. In other embodiments, the first light absorption element 4041 may also be located between the first light emitting element 401 and the second light emitting element 402, and the second light absorption element 4042 may also be located between the first light emitting element 401 and the third light emitting element 403.

[0068] Referring to Figure 7c , in some embodiments of the present disclosure, at least one light absorption element 404 includes a first light absorption element 4041 and a second light absorption element 4042 (that is, two light absorption elements are provided in one pixel unit 40). The first light absorption element 4041 is used to absorb light of the second color (such as G), and the second light absorption element 4042 is used to absorb light of the third color (such as B). The first light absorption element 4041 is disposed adjacent to the second light emitting element 402, and the second light absorption element 4042 is disposed adjacent to the third light emitting element 403. Figure 7c Taking the first light absorption element 4041 being located between the first light emitting element 401 and the second light emitting element 402, and the second light absorption element 4042 being located between the second light emitting element 402 and the third light emitting element 403 as an example for illustration, the embodiments of the present disclosure are not limited thereto. In other embodiments, the first light absorption element 4041 may also be located between the second light emitting element 402 and the third light emitting element 403, or the second light absorption element 4042 may also be located between the first light emitting element 401 and the third light emitting element 403.

[0069] Referring toFigure 7d , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 and a second light-absorbing element 4042 (i.e., two light-absorbing elements are provided in one pixel unit 40). The first light-absorbing element 4041 is used to absorb the mixed light of the first color and the second color (such as R+G), and the second light-absorbing element 4042 is used to absorb the light of the third color (such as B). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401 or the second light-emitting element 402, and the second light-absorbing element 4042 is disposed adjacent to the third light-emitting element 403. Figure 7d Taking the example where the first light-absorbing element 4041 is located between the first light-emitting element 401 and the third light-emitting element 403, and the second light-absorbing element 4042 is located between the second light-emitting element 402 and the third light-emitting element 403 for illustration, the embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the second light-emitting element 402 or between the second light-emitting element 402 and the third light-emitting element 403, and the second light-absorbing element 4042 may also be located between the first light-emitting element 401 and the third light-emitting element 403.

[0070] Refer to Figure 7e , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 and a second light-absorbing element 4042 (i.e., two light-absorbing elements are provided in one pixel unit 40). The first light-absorbing element 4041 is used to absorb the mixed light of the first color and the third color (such as R+B), and the second light-absorbing element 4042 is used to absorb the light of the second color (such as G). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401 or the third light-emitting element 403, and the second light-absorbing element 4042 is disposed adjacent to the second light-emitting element 402. Figure 7e Taking the example where the first light-absorbing element 4041 is located between the first light-emitting element 401 and the third light-emitting element 403, and the second light-absorbing element 4042 is located between the second light-emitting element 402 and the third light-emitting element 403 for illustration, the embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the second light-emitting element 402 or between the second light-emitting element 402 and the third light-emitting element 403, and the second light-absorbing element 4042 may also be located between the first light-emitting element 401 and the second light-emitting element 402.

[0071] Refer to Figure 7f, in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041 and a second light-absorbing element 4042 (i.e., two light-absorbing elements are provided in one pixel unit 40). The first light-absorbing element 4041 is configured to absorb the mixed light of the second color and the third color (e.g., G + B), and the second light-absorbing element 4042 is configured to absorb the light of the first color (e.g., R). The first light-absorbing element 4041 is disposed adjacent to the second light-emitting element 402 or the third light-emitting element 403, and the second light-absorbing element 4042 is disposed adjacent to the first light-emitting element 401. Figure 7f In Figure 7f , an example is illustrated where the first light-absorbing element 4041 is located between the second light-emitting element 402 and the third light-emitting element 403, and the second light-absorbing element 4042 is located between the first light-emitting element 401 and the third light-emitting element 403. The embodiments of the present disclosure are not limited thereto. In other embodiments, the first light-absorbing element 4041 may also be located between the first light-emitting element 401 and the second light-emitting element 402 or between the first light-emitting element 401 and the third light-emitting element 403, and the second light-absorbing element 4042 may also be located between the first light-emitting element 401 and the second light-emitting element 402.

[0072] Refer to Figure 8 , in some embodiments of the present disclosure, at least one light-absorbing element 404 includes a first light-absorbing element 4041, a second light-absorbing element 4042, and a third light-absorbing element 4043 (i.e., three light-absorbing elements are provided in one pixel unit 40). The first light-absorbing element 4041 is configured to absorb the light of the first color (e.g., R), the second light-absorbing element 4042 is configured to absorb the light of the second color (e.g., G), and the third light-absorbing element 4043 is configured to absorb the light of the third color (e.g., B). The first light-absorbing element 4041 is disposed adjacent to the first light-emitting element 401, the second light-absorbing element 4042 is disposed adjacent to the second light-emitting element 402, and the third light-absorbing element 4043 is disposed adjacent to the third light-emitting element 403.

[0073] It can be understood that in one pixel unit 40, one or more light-absorbing elements may be provided. When one light-absorbing element is provided (e.g., only the first light-absorbing element 4041 is provided), the absorption spectrum of the light-absorbing element can be extended by causing at least two sub-light-absorbing elements of one light-absorbing element to absorb different wavelength bands respectively; when only monochromatic light needs to be absorbed, at least two sub-light-absorbing elements can also be caused to absorb light of the same wavelength band to improve the light absorption ability of the light-absorbing element. When multiple light-absorbing elements are provided (e.g., the first light-absorbing element 4041 and the second light-absorbing element 4042 are provided, or the first light-absorbing element 4041, the second light-absorbing element 4042, and the third light-absorbing element 4043 are provided), different light-absorbing elements can be caused to absorb light of different wavelength bands respectively, which can not only extend the overall absorption spectrum of the light-absorbing element but also improve the light absorption sensitivity of a single light-absorbing element.

[0074] Figure 9 It is a schematic structural diagram of a display panel according to some embodiments of the present disclosure.

[0075] Referring to Figure 9 , in some embodiments of the present disclosure, the light-emitting element includes a plurality of sub-light-emitting elements stacked along the first direction X and a charge generation layer 90 located between two adjacent sub-light-emitting elements. Exemplarily, the plurality of sub-light-emitting elements stacked along the first direction X include first sub-light-emitting elements 431, 441, 451 disposed on the side of the charge generation layer 90 close to the substrate 10 and second sub-light-emitting elements 432, 442, 452 disposed on the side of the charge generation layer 90 far from the substrate 10.

[0076] It should be noted that under the condition of an applied electric field, the charge generation layer 90 can generate electrons and holes. Specifically, the N-type charge generation layer 901 generates electrons, and the P-type charge generation layer 902 generates holes. The electrons generated by the N-type charge generation layer 901 combine with the holes injected from the first sub-electrode 201 (i.e., the anode) in the first sub-light-emitting elements 431, 441, 451 to emit light, and the holes generated by the P-type charge generation layer 902 combine with the electrons injected from the second electrode layer 30 (i.e., the cathode) in the second sub-light-emitting elements 432, 442, 452 to emit light, achieving high brightness, high efficiency, and long life of the display panel at low current density.

[0077] In some embodiments of the present disclosure, at least two sub-light-absorbing elements stacked along the first direction X include a first sub-light-absorbing element 41 and a second sub-light-absorbing element 42. The first sub-light-absorbing element 41 is disposed on the same layer as the first sub-light-emitting elements 431, 441, 451, and the second sub-light-absorbing element 42 is disposed on the same layer as the second sub-light-emitting elements 432, 442, 452. It can be understood that in this embodiment, by disposing the first sub-light-absorbing element 41 on the same layer as the first sub-light-emitting elements 431, 441, 451 and disposing the second sub-light-absorbing element 42 on the same layer as the second sub-light-emitting elements 432, 442, 452, not only can the light-emitting efficiency of the display panel be improved, but also the step difference between the light-absorbing element and the light-emitting element can be reduced.

[0078] Figure 10 It is a flowchart of a control method for a display panel according to some embodiments of the present disclosure. Figure 11 It is a current-voltage curve diagram of a display panel according to some embodiments of the present disclosure.

[0079] As Figure 10 shown, the control method of the display panel includes steps S1 to S3.

[0080] In step S1, a current value generated by the light-absorbing element of the display panel is obtained.

[0081] In step S2, it is determined whether there is an intruder heat source other than the user's heat source in the environment where the display panel is located according to the current value. Specifically, when the user is reading the screen information, the user's own heat source (i.e., the user's heat source) can be locked. Once a new heat source (i.e., the intruder heat source) is added from other directions, the light-absorbing element absorbs different light intensities, generates different magnitudes of photo-generated carriers, that is, generates different magnitudes of current values. The screen circuit controller (such as a Central Processing Unit, abbreviated as CPU) will collect this current value, so that it can be determined whether there is an intruder heat source other than the user's heat source in the environment where the display panel is located according to the change in the current value.

[0082] In step S3, in response to the presence of an intruder heat source in the environment, the display panel is controlled to display a warning message, and / or the display panel is controlled to be adjusted to a privacy display mode visible only to the user. Specifically, a threshold value (such as 10 -7 A) can be set in the screen circuit controller. When the above current value exceeds this threshold value (i.e., there is an intruder heat source in the environment), the screen circuit controller can control the display panel to display a warning message. After seeing this warning message, the user can lock the screen or change the position to continue reading. The screen circuit controller can also change the current intensity of the thin-film transistor corresponding to the position where the external abnormal light source enters, and then change the light emission intensity of the screen light source, so as to achieve the privacy effect.

[0083] Referring to Figure 11 , the abscissa represents voltage, the ordinate represents current, curve d represents a schematic diagram of the current change of the display panel without a light-absorbing element at different voltages, and curve e represents a schematic diagram of the current change of the display panel as shown in Figure 3 (i.e., the display panel of a single-layer light-emitting device) at different voltages, and curves f and g represent a schematic diagram of the current change of the display panel as shown in Figure 9 (i.e., the display panel of a stacked light-emitting device) at different voltages. Specifically, curves f and g respectively represent schematic diagrams of the current change of the display panels of stacked light-emitting devices corresponding to different light-absorbing materials at different voltages. It can be seen from Figure 11 that at the same negative voltage, compared with curve d, the current values (i.e., the concentration of photo-generated carriers generated) of curves e, f, and g are larger, so the sensitivity is stronger.

[0084] The embodiments of the present disclosure also provide a display device, including the above display panel. For the specific structure and control method of the display panel, please refer to Figures 3 to 11 and the relevant descriptions, which will not be elaborated here.

[0085] While some embodiments in accordance with the general inventive concept of the present disclosure have been illustrated and described, those of ordinary skill in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; A first electrode layer, located on the substrate, the first electrode layer comprising a first sub-electrode and a second sub-electrode; a second electrode layer, located on a side of the first electrode layer away from the substrate; and A plurality of pixel units, each pixel unit comprising a plurality of light-emitting elements and at least one light-absorbing element, wherein the plurality of light-emitting elements are located between the first sub-electrode and the second electrode layer, and the at least one light-absorbing element is located between the second sub-electrode and the second electrode layer; The light emitting direction of the display panel is a first direction, and the light absorbing element includes at least two sub-light absorbing elements stacked along the first direction.

2. The display panel according to claim 1, characterized in that: The sub-light absorbing element includes a light absorbing portion and a carrier transporting portion located on a side of the light absorbing portion close to the substrate.

3. The display panel according to claim 1 or 2, characterized in that: The at least two sub-light absorbing elements include a first light absorbing portion and a second light absorbing portion; and The first light absorbing portion and the second light absorbing portion are used to absorb light of the same wavelength band; or, the first light absorbing portion is used to absorb light of a first color, and the second light absorbing portion is used to absorb complementary light of the first color; or, the band gap width of the material of the first light absorbing portion is greater than the band gap width of the material of the second light absorbing portion.

4. The display panel according to claim 1, characterized in that: The plurality of light emitting elements include a first light emitting element for emitting light of a first color, a second light emitting element for emitting light of a second color, and a third light emitting element for emitting light of a third color.

5. The display panel according to claim 4, characterized in that: The at least one light absorbing element comprises a first light absorbing element; and The first light absorbing element is used to absorb the mixed light of the first color, the second color and the third color, and the first light absorbing element is located between two adjacent light-emitting elements; or, the first light absorbing element is used to absorb the mixed light of the first color and the second color, and the first light absorbing element is arranged adjacent to the first light-emitting element or the second light-emitting element; or, the first light absorbing element is used to absorb the mixed light of the first color and the third color, and the first light absorbing element is arranged adjacent to the first light-emitting element or the third light-emitting element; or, the first light absorbing element is used to absorb the mixed light of the second color and the third color, and the first light absorbing element is arranged adjacent to the second light-emitting element or the third light-emitting element; or, the first light absorbing element is used to absorb the light of the first color, and the first light absorbing element is arranged adjacent to the first light-emitting element; or, the first light absorbing element is used to absorb the light of the second color, and the first light absorbing element is arranged adjacent to the second light-emitting element; or, the first light absorbing element is used to absorb the light of the third color, and the first light absorbing element is arranged adjacent to the third light-emitting element.

6. The display panel according to claim 4, characterized in that: The at least one light absorbing element comprises a first light absorbing element and a second light absorbing element; and The first light absorbing element is used to absorb the light of the first color, the second light absorbing element is used to absorb the light of the second color, the first light absorbing element is arranged adjacent to the first light emitting element, and the second light absorbing element is arranged adjacent to the second light emitting element; or, the first light absorbing element is used to absorb the light of the first color, the second light absorbing element is used to absorb the light of the third color, the first light absorbing element is arranged adjacent to the first light emitting element, and the second light absorbing element is arranged adjacent to the third light emitting element; or, the first light absorbing element is used to absorb the light of the second color, the second light absorbing element is used to absorb the light of the third color, the first light absorbing element is arranged adjacent to the second light emitting element, and the second light absorbing element is arranged adjacent to the third light emitting element; or, the first light absorbing element is used to absorb the light of the first color and the second color The second light absorbing element is used to absorb the mixed light of the first color and the third color, the second light absorbing element is used to absorb the light of the third color, the first light absorbing element is arranged adjacent to the first light-emitting element or the second light-emitting element, and the second light absorbing element is arranged adjacent to the third light-emitting element; or, the first light absorbing element is used to absorb the mixed light of the first color and the third color, the second light absorbing element is used to absorb the light of the second color, the first light absorbing element is arranged adjacent to the first light-emitting element or the third light-emitting element, and the second light absorbing element is arranged adjacent to the second light-emitting element; or, the first light absorbing element is used to absorb the mixed light of the second color and the third color, the second light absorbing element is used to absorb the light of the first color, the first light absorbing element is arranged adjacent to the second light-emitting element or the third light-emitting element, and the second light absorbing element is arranged adjacent to the first light-emitting element.

7. The display panel according to claim 4, characterized in that: The at least one light absorbing element comprises a first light absorbing element, a second light absorbing element and a third light absorbing element, wherein the first light absorbing element is used to absorb light of the first color, the second light absorbing element is used to absorb light of the second color, and the third light absorbing element is used to absorb light of the third color; as well as The first light absorbing element is disposed adjacent to the first light emitting element, the second light absorbing element is disposed adjacent to the second light emitting element, and the third light absorbing element is disposed adjacent to the third light emitting element.

8. The display panel according to any one of claims 1 to 7, characterized in that: The light emitting element further includes a plurality of sub-light emitting elements stacked along the first direction and a charge generating layer located between two adjacent sub-light emitting elements.

9. The display panel according to claim 8, characterized in that: The plurality of sub-light emitting elements stacked along the first direction include a first sub-light emitting element disposed on a side of the charge generating layer close to the substrate and a second sub-light emitting element disposed on a side of the charge generating layer away from the substrate; The at least two sub-light absorbing elements stacked along the first direction include a first sub-light absorbing element and a second sub-light absorbing element; and The first light absorbing sub-element is disposed on the same layer as the first light emitting sub-element, and the second light absorbing sub-element is disposed on the same layer as the second light emitting sub-element.

10. A method for controlling a display panel according to any one of claims 1 to 9, characterized in that: The method comprises: Acquiring a current value generated by a light absorbing element of the display panel; determining whether there is an intruder heat source other than a user heat source in the environment where the display panel is located according to the current value; In response to the presence of the intruder heat source in the environment, the display panel is controlled to display a warning message, and / or the display panel is controlled to adjust to an anti-peeping display mode that is visible only to a user.

Images