Pixel structure, OLED display panel, display device and driving method thereof

Abstract

The invention relates to the technical field of display, and discloses a pixel structure, an OLED display panel, a display device and a driving method of the display device. And an organic light-emitting layer. The pixel structure comprises a cathode, an anode and a light-emitting layer, the cathode and the anode are arranged on a substrate, the light-emitting layer is located between the cathode and the anode, the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer which are sequentially arranged in the thickness direction of the substrate, and light emitted by the first light-emitting layer and light emitted by the second light-emitting layer are different in color. The pixel structure provided by the invention has the advantages of variable pixel design characteristic, more flexible spectrum conversion, good compatibility with a night vision imaging system, low cost and the like, can effectively solve the problem of interference with the night vision imaging system in a night use scene, and has small influence on a screen color gamut.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a pixel structure, an OLED display panel, a display device and a driving method thereof. Background Art

[0002] With the continuous development of OLED (Organic Light-Emitting Diode, OLED for short) display technology, OLED display technology has gradually become the mainstream display technology. Among them, OLED display screens used in special fields such as aerospace not only need to meet the advantages of low power consumption, high brightness, high reliability, and direct viewing under strong light, but also need to be compatible with the Night Vision Imaging System (NVIS for short).

[0003] Night vision technology is a technology that uses photoelectric detection and imaging technology and equipment to convert (enhance) targets that are invisible to the human eye due to darkness into visible images. The essence of night vision compatible technology is that the relevant display devices that use night vision technology will not emit light or energy that interferes with the night vision imaging system (referred to as night vision device) when used at night. Night vision compatible technology is an important guarantee for the safe realization of night vision.

[0004] In addition to radiating visible light, display screens also radiate high energy in the infrared region. Although the light emitted by display screens is greatly reduced at night, the near-infrared light or red light they radiate will overlap with the spectral response area of ​​night vision devices. These lights can greatly interfere with night vision devices with extremely high light sensitivity, and may even cause the image intensifier of night vision devices to burn out instantly, greatly reducing the performance of night vision devices, or even completely losing their night vision function. Summary of the invention

[0005] In view of the above-mentioned defects, the present disclosure provides a pixel structure, an OLED display panel, a display device and a driving method thereof.

[0006] A first aspect of the present disclosure provides a pixel structure, comprising:

[0007] A cathode, an anode and a light-emitting layer located between the cathode and the anode are arranged on a substrate, wherein the light-emitting layer includes a first light-emitting layer and a second light-emitting layer arranged in sequence along the thickness direction of the substrate, the first light-emitting layer and the second light-emitting layer emit light of different colors, and the cathode and the anode are used to respectively control the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0008] Furthermore, it also includes:

[0009] an intermediate electrode located between the first light-emitting layer and the second light-emitting layer;

[0010] The cathode, the middle electrode and the anode are used to respectively control the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0011] Furthermore, the intermediate electrode is a multi-layer structure, and the intermediate electrode includes an electron injection layer, a metal-organic mixed layer and a hole injection layer which are sequentially arranged along the thickness direction of the substrate.

[0012] Furthermore, the first light-emitting layer is a red light-emitting layer, and the second light-emitting layer is an orange light-emitting layer.

[0013] A second aspect of the present disclosure provides an OLED display panel, comprising:

[0014] A substrate, comprising a plurality of pixels, wherein the plurality of pixels include a target pixel, wherein the target pixel includes a cathode, an anode and a light-emitting layer located between the cathode and the anode, the light-emitting layer including a first light-emitting layer and a second light-emitting layer sequentially arranged along a thickness direction of the substrate, and the first light-emitting layer and the second light-emitting layer emit light of different colors;

[0015] The driving circuit is connected to the cathode and the anode and is used to drive the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0016] Further, the target pixel further includes an intermediate electrode located between the first light-emitting layer and the second light-emitting layer;

[0017] The driving circuit is connected to the cathode, the middle electrode and the anode, and is used to drive the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0018] Furthermore, the driving circuit includes a first driving circuit and a second driving circuit, the first driving circuit is connected to the cathode and the middle electrode, and is used to drive the first light-emitting layer to emit light in a first time period; the second driving circuit is connected to the anode and the middle electrode, and is used to drive the second light-emitting layer to emit light in a second time period.

[0019] Furthermore, the intermediate electrode is a multi-layer structure, and the intermediate electrode includes an electron injection layer, a metal-organic mixed layer and a hole injection layer which are sequentially arranged along the thickness direction of the substrate.

[0020] Furthermore, the driving circuit provides different voltages to the anode in different time periods to respectively drive the first light-emitting layer and the second light-emitting layer to emit light.

[0021] Furthermore, the first light-emitting layer is a red light-emitting layer, and the second light-emitting layer is an orange light-emitting layer.

[0022] According to a third aspect of the present disclosure, a display device is provided, comprising:

[0023] An OLED display panel as described in the second aspect above.

[0024] Furthermore, it also includes:

[0025] Light sensor, used to obtain the current light intensity;

[0026] The controller is connected to the light sensor and the driving circuit, and is used to determine the current time period according to the current light intensity obtained by the light sensor, and control the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period.

[0027] A fourth aspect of the present disclosure provides a method for driving the display device according to the third aspect, the method comprising:

[0028] The control driving circuit drives the first light emitting layer or the second light emitting layer of the OLED display panel to emit light in different time periods.

[0029] Furthermore, it also includes:

[0030] Get the current light intensity through the light sensor;

[0031] Determine a current time period according to the current light intensity;

[0032] The control driving circuit drives the first light emitting layer or the second light emitting layer of the OLED display panel to emit light in different time periods, including:

[0033] Based on the current time period, the driving circuit is controlled to drive the first light-emitting layer or the second light-emitting layer to emit light.

[0034] Further, the controlling the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period includes:

[0035] Based on a preset driving strategy, determining a target light-emitting layer corresponding to the current time period from the first light-emitting layer and the second light-emitting layer;

[0036] Obtaining a driving voltage corresponding to the target light-emitting layer;

[0037] The driving circuit is controlled to provide the driving voltage to the anode to drive the target light emitting layer to emit light.

[0038] Further, the driving circuit includes a first driving circuit and a second driving circuit, the first driving circuit is connected to the cathode and the middle electrode, and the second driving circuit is connected to the anode and the middle electrode; and the controlling the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period includes:

[0039] When the current time period is the first time period, the anode and the middle electrode are controlled to be in an open circuit state, the cathode and the middle electrode are controlled to be in a closed circuit state, and the first driving circuit is controlled to provide a first driving voltage to the middle electrode to drive the first light-emitting layer to emit light;

[0040] When the current time period is the second time period, the cathode and the middle electrode are controlled to be in an open circuit state, the anode and the middle electrode are controlled to be in a closed circuit state, and the second driving circuit is controlled to provide a second driving voltage to the anode to drive the second light-emitting layer to emit light.

[0041] Compared with the prior art, the beneficial technical effects of the technical solution disclosed in the present invention include:

[0042] The structure and process become simpler, the spectrum conversion is more flexible, the compatibility with the night vision imaging system is better and the cost is lower, which can effectively solve the interference problem between the display device equipped with the pixel structure provided by the present invention and the night vision imaging system in the night use scenario, and at the same time has little impact on the color gamut of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in the relevant field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0044] It should also be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings. The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments and their descriptions in the present disclosure are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0045] Figure 1 A schematic diagram representing the relationship between two light-emitting layers provided in an embodiment of the present disclosure;

[0046] Figure 2 A schematic diagram of a pixel structure provided by an embodiment of the present disclosure when it is lit during the day and at night;

[0047] Figure 3 A schematic diagram of an orange light spectrum, a red light spectrum and a near infrared spectrum provided in an embodiment of the present disclosure;

[0048] Figure 4 A schematic diagram of the electroluminescence mechanism of a red light-emitting layer provided in an embodiment of the present disclosure;

[0049] Figure 5 A schematic diagram of the electroluminescence mechanism of an orange light-emitting layer provided in an embodiment of the present disclosure;

[0050] Figure 6 A schematic diagram of a parallel structure of a red light-emitting layer and an orange light-emitting layer provided in an embodiment of the present disclosure;

[0051] Figure 7 A flow chart of a display device driving method provided by an embodiment of the present disclosure;

[0052] Figure 8 A flow chart of a method for driving a display device by a single driving circuit provided in an embodiment of the present disclosure;

[0053] Fig. 9 A flow chart of a method for driving a target light-emitting layer of a display device under a dual driving circuit provided in an embodiment of the present disclosure;

[0054] Fig.10 A flow chart of a method for driving two light-emitting layers of a display device respectively by using dual driving circuits provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] The following will describe the implementation methods of the present disclosure in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present disclosure applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present disclosure and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the protection scope of the present disclosure.

[0056] It should be clear that the embodiments described below are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by technicians in the relevant field without creative work are within the scope of protection of the present disclosure.

[0057] In addition to radiating visible light, the display screen also radiates high energy in the infrared region. In scenarios where night vision is required, although the light emitted by the display screen is greatly reduced at night, the near-infrared light or red light radiated by the display screen will overlap with the spectrum of the night vision device. These lights in the overlapping area can cause great interference to the night vision device with extremely high light sensitivity, and may even cause the image intensifier of the night vision device to burn out instantly, greatly reducing the performance of the night vision device, or even completely losing its night vision function.

[0058] In order to achieve the goal of making the display screen compatible with the night vision imaging system, it is necessary to control the light emitted by the display screen and the night vision imaging system to prevent mutual interference during the night operation of the display screen, so as to maintain naked eye visibility. In order to solve the above problems, the present disclosure provides a pixel structure that can achieve night vision compatibility and has variable pixel design features.

[0059] The present disclosure provides a pixel structure, comprising:

[0060] A cathode, an anode and a light-emitting layer located between the cathode and the anode are arranged on a substrate, the light-emitting layer includes a first light-emitting layer and a second light-emitting layer arranged in sequence along the thickness direction of the substrate, the first light-emitting layer and the second light-emitting layer emit light of different colors, and the cathode and the anode are used to control the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0061] The pixel structure can drive the first light-emitting layer or the second light-emitting layer to emit light of different colors in different time periods (for example, including a first time period and a second time period; wherein the first time period can be daytime and the second time period can be nighttime). For example, the first light-emitting layer is driven to emit light when used during the day, and the second light-emitting layer is driven to emit light when used at night, and then the first light-emitting layer or the second light-emitting layer can be controlled to emit light for display according to the actual scene. For scenes with night vision imaging requirements, by switching the first light-emitting layer or the second light-emitting layer to emit light of different colors during the day and night, the spectral interference problem between the pixel structure and the night vision imaging system can be avoided, and the impact on the color gamut is also small.

[0062] refer to Figure 1 A second light-emitting layer is arranged above the first light-emitting layer. The deposition preparation method of the light-emitting material of the second light-emitting layer can be completely consistent with the deposition preparation method of the light-emitting material of the first light-emitting layer. The specific deposition preparation method can be a vacuum evaporation deposition process, or it can be selected according to actual needs. By providing different driving voltages to the anode through the driving circuit, the first light-emitting layer or the second light-emitting layer can be driven to emit light.

[0063] In some embodiments, the first light-emitting layer is a red light-emitting layer, and the second light-emitting layer is an orange light-emitting layer.

[0064] Under the action of the driving circuit, the red light emitting layer can emit red light, and the orange light emitting layer can emit orange light.

[0065] refer to Figure 2 When working in a first time period (for example, daytime), the red light-emitting layer is driven by the driving circuit to emit red light, wherein the driving voltage (low voltage) output by the driving circuit during the day can be: 6.5V, 6.7V, 6.9V, 7.1V, 7.3V, 7.5V, etc.; when working at night, the orange light-emitting layer is driven by the driving circuit to emit orange light, wherein the driving voltage (high voltage) output by the driving circuit at night can be: 8.0V, 8.2V, 8.4V, 8.6V, 8.8V, 9.0V, etc.

[0066] refer to Figure 3 , the wavelength range of near-infrared light spectrum is 700-1000nm; the wavelength range of red light spectrum is 620-780nm; and the wavelength range of orange light spectrum is 400-700nm, with its peak wavelength at around 550nm; when working at night, the orange spectrum has no overlap with the near-infrared spectrum, but partially overlaps with the red spectrum. At this time, the luminous spectrum range is blue-shifted from the original 620-780nm to 400-780nm.

[0067] Therefore, when used at night, controlling the orange light-emitting layer to emit orange light can minimize near-infrared light or red light, thereby avoiding spectral overlap with night vision goggles. This can effectively reduce interference with the night vision imaging system when used at night, while also having less impact on the screen color gamut.

[0068] It should be noted that the mechanism with variable pixel design features provided by the present disclosure can be referred to Figure 4 and Figure 5 . Under relatively low voltage conditions, the number of electrically excited carriers is small, and they can only enter the red light-emitting material with a smaller potential barrier for electroluminescence; among them, the HOMO Energy of commonly used red light-emitting materials can be 5.1eV, and the LUMO Energy can be 3.1eV. Under relatively high voltage conditions, the number of electrically excited carriers increases significantly, and the number of carriers that cross the high potential barrier and enter the orange light-emitting material also increases, thereby generating electroluminescence. Depending on the orange light-emitting material, the HOMO Energy of the orange light-emitting material can be 5.2eV or 5.3eV or 5.4eV, etc., and the LUMO Energy can be 3.1eV; similarly, the LUMO Energy of the orange light-emitting material can be 3.0eV or 2.9eV or 2.8eV, etc., and the HOMO Energy can be 5.1eV.

[0069] The pixel structure provided by the present invention can avoid the problem of spectral interference with night vision goggles, ensure the normal display of instrument information on the display screen, and also have a good display effect under new night vision compatible applications.

[0070] It should be noted that the second light-emitting layer can also be a cyan light-emitting layer, a pink light-emitting layer, etc., which can be set according to actual needs.

[0071] In some embodiments, the pixel structure further includes:

[0072] an intermediate electrode located between the first light-emitting layer and the second light-emitting layer;

[0073] The driving circuit is connected to the cathode, the middle electrode and the anode, and is used for driving the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0074] For different time periods, the first light-emitting layer or the second light-emitting layer is driven to emit light by the driving circuit. For example, in the first time period (e.g., daytime), only the first light-emitting layer is driven to emit light (when the first light-emitting layer is a red light-emitting layer, red light is emitted); in the second time period (e.g., nighttime), only the second light-emitting layer is driven to emit light (when the second light-emitting layer is an orange light-emitting layer, orange light is emitted). In view of this, since the first light-emitting layer and the second light-emitting layer will not emit light at the same time, there will be no spectral overlap between the light emitted by the second light-emitting layer at night and the night vision imaging system.

[0075] refer to Figure 3 When working in the second time period (for example, at night), after driving the second light-emitting layer to emit orange light, the light-emitting spectrum range of the pixel structure is blue-shifted from the original 620-780nm to 400-700nm, which has no overlap with the near-infrared spectrum. Therefore, the spectral interference problem with the night vision imaging system at night can be completely solved, and the color gamut of the screen is less affected.

[0076] In some embodiments, the intermediate electrode may be a single layer or a multilayer structure. In the case where the intermediate electrode is a multilayer structure, the intermediate electrode includes an electron injection layer, a metal-organic hybrid layer and a hole injection layer sequentially arranged along the thickness direction of the substrate.

[0077] When the intermediate electrode is a multilayer structure, the multilayer structure of the intermediate electrode may include an electron injection layer LiF with a thickness of 10A, a hole injection layer NPB with a thickness of 200A, and a metal-organic mixed layer AlQ3 / Ag (mass ratio of 90:10) with a thickness of 500A located between the two.

[0078] The metal-organic mixed layer can be used as both an anode and a cathode, and forms a circuit with the upper cathode and the lower anode respectively.

[0079] As an example, in a first time period (for example, during the day), the anode and the middle electrode are controlled to be in an open circuit state, and the cathode and the middle electrode are controlled to be in a closed circuit state. At this time, the metal-organic mixed layer acts as a cathode; in a second time period (for example, at night), the cathode and the middle electrode are controlled to be in an open circuit state, and the anode and the middle electrode are controlled to be in a closed circuit state. At this time, the metal-organic mixed layer acts as an anode.

[0080] Furthermore, the present disclosure provides an OLED display panel, comprising:

[0081] A substrate, comprising a plurality of pixels, wherein the plurality of pixels include a target pixel, wherein the target pixel includes a cathode, an anode and a light-emitting layer located between the cathode and the anode, the light-emitting layer including a first light-emitting layer and a second light-emitting layer sequentially arranged along a thickness direction of the substrate, and the first light-emitting layer and the second light-emitting layer emit light of different colors;

[0082] The driving circuit is connected to the cathode and the anode, and is used to drive the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0083] The OLED display panel drives the first light-emitting layer and the second light-emitting layer to emit light of different colors respectively through a driving circuit, thereby controlling the light-emitting layers to emit different light at different time periods, thereby avoiding the problem of spectral interference between the OLED display panel and the night vision imaging system when the OLED display panel is used at night.

[0084] In some embodiments, the first light-emitting layer is a red light-emitting layer, and the second light-emitting layer is an orange light-emitting layer.

[0085] As an example, in Figure 1 In the structure shown, the first light-emitting layer (red light-emitting layer) and the second light-emitting layer (orange light-emitting layer) are controlled by the same driving circuit. The driving circuit provides voltages of different magnitudes to the two light-emitting layers, thereby controlling the two light-emitting layers to emit light separately. For example, when used during the day, the driving circuit provides a first driving voltage to the anode to drive the red light-emitting layer to emit red light; when used at night, the driving circuit provides a second driving voltage to the anode to drive the orange light-emitting layer to emit orange light.

[0086] The red light emitting layer is controlled to emit red light during daytime use, and the orange light emitting layer is controlled to emit orange light during nighttime use. Since the spectrum wavelength range of near-infrared light is between 700 and 1000nm, and the spectrum wavelength range of orange is between 400 and 700nm, with a peak wavelength of around 550nm, the near-infrared spectrum and the orange spectrum do not overlap at all, thus avoiding the spectrum interference problem with night vision devices when working at night.

[0087] In some embodiments, the target pixel further includes an intermediate electrode located between the first light emitting layer and the second light emitting layer;

[0088] The driving circuit is connected to the cathode, the middle electrode and the anode, and is used for driving the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

[0089] As an example, when used during the day, the circuit between the anode and the middle electrode is controlled to be in a closed circuit state (the circuit between the cathode and the middle electrode is in an open circuit state); when used at night, the circuit between the cathode and the middle electrode is controlled to be in a closed circuit state (the circuit between the anode and the middle electrode is in an open circuit state).

[0090] In some embodiments, the driving circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected to the cathode and the middle electrode, and is used to drive the first light-emitting layer to emit light in a first time period; the second driving circuit is connected to the anode and the middle electrode, and is used to drive the second light-emitting layer to emit light in a second time period.

[0091] In a first time period (e.g., daytime), the first driving circuit drives the first light-emitting layer to emit light, and does not trigger the second light-emitting layer to emit light; in a second time period (e.g., nighttime), the second driving circuit drives the second light-emitting layer to emit light, and does not trigger the first light-emitting layer to emit light. In view of this, since the first light-emitting layer and the second light-emitting layer do not emit light at the same time, there will be no spectral overlap between the light emitted by the second light-emitting layer and the night vision imaging system at night.

[0092] In some embodiments, the intermediate electrode may be a single layer or a multilayer structure. In the case where the intermediate electrode is a multilayer structure, the intermediate electrode includes an electron injection layer, a metal-organic hybrid layer and a hole injection layer sequentially arranged along the thickness direction of the substrate.

[0093] When the intermediate electrode is a multilayer structure, the multilayer structure of the intermediate electrode includes an electron injection layer LiF with a thickness of 10A, a hole injection layer NPB with a thickness of 200A, and a metal-organic mixed layer AlQ3 / Ag (mass ratio of 90:10) with a thickness of 500A located between the two.

[0094] The metal-organic mixed layer can be used as both an anode and a cathode, and forms a circuit with the upper cathode and the lower anode respectively.

[0095] As an example, in a first time period (for example, during the day), the anode and the middle electrode are controlled to be in an open circuit state, and the cathode and the middle electrode are controlled to be in a closed circuit state. At this time, the metal-organic mixed layer acts as a cathode; in a second time period (for example, at night), the cathode and the middle electrode are controlled to be in an open circuit state, and the anode and the middle electrode are controlled to be in a closed circuit state. At this time, the metal-organic mixed layer acts as an anode.

[0096] In some embodiments, the driving circuit provides different voltages to the anode in different time periods to respectively drive the first light-emitting layer and the second light-emitting layer to emit light.

[0097] Since the first light-emitting layer and the second light-emitting layer are made of different light-emitting materials, different driving voltages need to be provided when controlling the first light-emitting layer or the second light-emitting layer to emit light.

[0098] As an example, when working during the day, the red light-emitting layer is driven by the first driving circuit to emit red light, wherein the driving voltage output by the driving circuit during the day can be: 6.5V, 6.7V, 6.9V, 7.1V, 7.3V, 7.5V, etc.; when working at night, the orange light-emitting layer is driven by the second driving circuit to emit orange light, wherein the driving voltage output by the driving circuit at night can be: 8.0V, 8.2V, 8.4V, 8.6V, 8.8V, 9.0V, etc.

[0099] refer to Figure 6 , an intermediate electrode is prepared between a first light-emitting layer (e.g., a red light-emitting layer) and a second light-emitting layer (e.g., an orange light-emitting layer) to form a parallel stacked structure between the first light-emitting layer and the second light-emitting layer. The intermediate electrode is a multilayer structure, one side of which is used as an electron injection contact and the other side is used as a hole injection contact. The intermediate electrode includes a metal-organic mixed layer AlQ3 / Ag (mass ratio of 90:10) with a thickness of 500A, and an electron injection layer with a thickness of 10A and a hole injection layer with a thickness of 200A are deposited on the upper and lower sides of the metal-organic mixed layer, respectively.

[0100] As an example, when used during the day, the anode and the middle electrode are controlled to be in a closed circuit state (the cathode and the middle electrode are in an open circuit state), and the driving voltage output by the driving circuit during the day can be: 6.5V, 6.7V, 6.9V, 7.1V, 7.3V, 7.5V, etc.; when used at night, the cathode and the middle electrode are controlled to be in a closed circuit state (the anode and the middle electrode are in an open circuit state), and the driving voltage output by the driving circuit at night can be: 8.0V, 8.2V, 8.4V, 8.6V, 8.8V, 9.0V, etc. At this time, the luminous spectrum range is blue-shifted from the original 620-780nm to 400-700nm, and there is no overlap with the near-infrared spectrum. Therefore, the interference problem with the night vision imaging system when used at night can be completely solved, and the impact on the screen color gamut is also small.

[0101] According to some embodiments of the present application, Figure 6 As shown, the OLED display panel may include:

[0102] A glass substrate, an anode, a hole transport layer, a first light emitting layer, an electron transport layer, an intermediate electrode, a hole transport layer, a second light emitting layer, an electron transport layer and a cathode are sequentially arranged along the thickness direction of the panel. Where the intermediate electrode is a multilayer structure, the intermediate electrode includes an electron injection layer, a metal-organic mixed layer and a hole injection layer sequentially arranged along the thickness direction of the panel; wherein the metal-organic mixed layer can be used as both an anode and a cathode, and respectively forms a circuit with the upper cathode and the lower anode.

[0103] The driving circuit of the OLED display panel may include a first driving circuit and a second driving circuit; wherein the first driving circuit is connected to the cathode and the middle electrode, and the second driving circuit is connected to the anode and the middle electrode. When the current time period is the first time period, the anode and the middle electrode are controlled to be in an open circuit state, the cathode and the middle electrode are controlled to be in a closed circuit state, and the first driving circuit is controlled to provide a first driving voltage to the middle electrode to drive the first light-emitting layer to emit light; when the current time period is the second time period, the cathode and the middle electrode are controlled to be in an open circuit state, the anode and the middle electrode are controlled to be in a closed circuit state, and the second driving circuit is controlled to provide a second driving voltage to the anode to drive the second light-emitting layer to emit light.

[0104] Specifically, when the OLED display panel is used during the day, the red light emitting layer is controlled to emit red light, and when it is used at night, the orange light emitting layer is controlled to emit orange light. Since the spectrum wavelength range of near-infrared light is between 700 and 1000nm, and the spectrum wavelength range of orange is between 400 and 700nm, with a peak wavelength of around 550nm, the near-infrared spectrum and the orange spectrum do not overlap at all, thereby avoiding the problem of spectral interference with night vision devices when working at night.

[0105] The present disclosure also provides another display device, comprising the above OLED display panel.

[0106] In some embodiments, it also includes:

[0107] Light sensor, used to obtain the current light intensity;

[0108] The controller is connected to the light sensor and the driving circuit, and is used to determine the current time period according to the current light intensity obtained by the light sensor, and control the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period.

[0109] The light sensor is used to obtain the current light intensity of the environment in which the display device is located. Further, the controller determines the current time period according to the current light intensity, and controls the driving circuit to drive the light-emitting layer corresponding to the current time period to emit light based on the current time period. For example, when the current time period is daytime, the first light-emitting layer is driven to emit light; when the current time period is nighttime, the second light-emitting layer is driven to emit light.

[0110] It should be noted that, for how to drive the first light-emitting layer or the second light-emitting layer to emit light, reference may be made to the previous description.

[0111] Please refer to the following Figure 7 to Figure 10 The present disclosure also provides a method for driving the display device as described above. The method comprises the following steps:

[0112] Step 710: Control the driving circuit to drive the first light-emitting layer or the second light-emitting layer of the OLED display panel to emit light in different time periods.

[0113] In different time periods (including a first time period and a second time period; wherein the first time period may be daytime and the second time period may be nighttime), the first light-emitting layer or the second light-emitting layer is controlled to emit light respectively.

[0114] In some embodiments, it also includes:

[0115] Step 810, obtaining the current light intensity through the light sensor;

[0116] Step 820, determining the current time period according to the current light intensity;

[0117] The control driving circuit drives the first light emitting layer or the second light emitting layer of the OLED display panel to emit light in different time periods, including:

[0118] Step 830: Based on the current time period, control the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light.

[0119] Optionally, the current light intensity is obtained based on the light sensor, and the current time period is determined according to the current light intensity (for example, if the current light intensity is not less than a preset light intensity threshold, it belongs to the first time period; if the current light intensity is less than the preset light intensity threshold, it belongs to the second time period), and then the first light-emitting layer or the second light-emitting layer is controlled to emit light in different time periods.

[0120] The first light-emitting layer or the second light-emitting layer can be driven to emit light of different colors in different time periods, thereby avoiding the problem of spectral interference with the night vision imaging system when used at night.

[0121] In some embodiments, controlling the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period includes:

[0122] Step 910: determining a target light-emitting layer corresponding to the current time period from the first light-emitting layer and the second light-emitting layer based on a preset driving strategy;

[0123] Step 920, obtaining a driving voltage corresponding to the target light-emitting layer;

[0124] Step 930: Control the driving circuit to provide a driving voltage to the anode to drive the target light-emitting layer to emit light.

[0125] Specifically, the preset driving strategy may be set as: driving the first light-emitting layer to emit light during the day, and driving the second light-emitting layer to emit light at night.

[0126] In addition, the driving voltage corresponding to the target light-emitting layer can be obtained according to the preset relationship between the light-emitting layer and the driving voltage. The preset relationship between the light-emitting layer and the driving voltage needs to be set in advance, for example: when working during the day, the first light-emitting layer is driven to emit light (for example, red light); when working at night, the second light-emitting layer is driven to emit light (for example, orange light).

[0127] In some embodiments, the driving circuit includes a first driving circuit and a second driving circuit, the first driving circuit is connected to the cathode and the middle electrode, and the second driving circuit is connected to the anode and the middle electrode; the controlling the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period includes:

[0128] Step 1010: when the current time period is the first time period, control the anode and the middle electrode to be in an open circuit state, the cathode and the middle electrode to be in a closed circuit state, and control the first driving circuit to provide a first driving voltage to the middle electrode to drive the first light-emitting layer to emit light;

[0129] Step 1020: When the current time period is the second time period, control the cathode and the middle electrode to be in an open circuit state, the anode and the middle electrode to be in a closed circuit state, and control the second drive circuit to provide a second drive voltage to the anode to drive the second light-emitting layer to emit light.

[0130] It can be understood that, in the case where two driving circuits (a first driving circuit and a second driving circuit) are provided, the corresponding light-emitting layer is driven to emit light by controlling different driving circuits respectively. That is, the first driving circuit is connected to the cathode and the middle electrode, and is used to drive the first light-emitting layer to emit light in the first time period; the second driving circuit is connected to the anode and the middle electrode, and is used to drive the second light-emitting layer to emit light in the second time period.

[0131] Specifically, controlling the two driving circuits to drive the two light-emitting layers to emit light respectively can ensure that only one light-emitting layer emits light at the same time. Since the first light-emitting layer and the second light-emitting layer do not emit light at the same time, there will be no spectral overlap between the light emitted by the second light-emitting layer and the night vision imaging system at night.

[0132] In summary, the pixel structure provided by the present disclosure has the characteristics of variable pixel design. Under the bottom-emitting or top-emitting device structure (in the case of top emission, as long as a strong microcavity is not formed to narrow the spectral wavelength range), the beneficial effects of the present disclosure include: simple structure and process changes, flexible spectrum changes, good compatibility, low cost, and can effectively solve the problem of interference with the night vision imaging system of the display device in nighttime use scenarios, while having little impact on the screen color gamut. Moreover, compared with the fourth pixel design under the prior art, the variable pixel design solution provided by the present disclosure reduces the FMM (Fine Metal Mask, referred to as FMM) design revision, greatly reducing the process difficulty and cost.

[0133] It should be understood by those skilled in the art that the above-mentioned modules or steps of the present disclosure can be implemented by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices. Alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be performed in a different order than that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation.

[0134] The present disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, all or part of the steps in the aforementioned method can be implemented, which will not be repeated here.

[0135] Among them, the computer-readable storage medium may also include a computer program, a data file, a data structure, etc. alone, or a combination thereof. The computer-readable storage medium or computer program may be specifically designed and understood by a technician in the field of computer software, or the computer-readable storage medium may be known and available to a technician in the field of computer software. Examples of computer-readable storage media include: magnetic media, such as hard disks, floppy disks, and tapes; optical media, such as CD-ROM disks and DVDs; magneto-optical media, such as optical disks; and hardware devices, specifically configured to store and execute computer programs, such as read-only memory (ROM), random access memory (RAM), flash memory; or servers, app application stores, etc. Examples of computer programs include machine code (e.g., code generated by a compiler) and files containing high-level code, which can be executed by a computer using an interpreter. The described hardware device may be configured to be used as one or more software modules to perform the operations and methods described above, and vice versa. In addition, the computer-readable storage medium may be distributed in a networked computer system, and program code or computer programs may be stored and executed in a decentralized manner.

[0136] The present disclosure also provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, all or part of the steps of the above method are implemented, which will not be repeated here.

[0137] Further, the computer program product may include one or more computer executable components configured to execute any method in the embodiments of the present disclosure when the program is run; the computer program product may also include a computer program tangibly contained on a readable medium, the computer program including program code for executing any method in the embodiments of the present disclosure. In such an embodiment, the computer program may be downloaded and installed from a network through a communication part, and / or installed from a removable medium.

[0138] The present disclosure also provides an electronic device, which may include: one or more processors, a memory, a multimedia component, an input / output (I / O) interface, and a communication component.

[0139] One or more processors are used to execute all or part of the steps in the above method. The memory is used to store various types of data, which may include instructions of any application or method in the electronic device, and data related to the application.

[0140] One or more processors may be an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and are used to execute methods such as those described above.

[0141] The memory can be implemented by any type of volatile or non-volatile storage device or a combination of them, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0142] The multimedia component may include a screen and an audio component, the screen may be a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone, and the microphone is used to receive external audio signals. The received audio signal may be further stored in a memory or sent via a communication component. The audio component also includes at least one speaker for outputting audio signals.

[0143] The I / O interface provides an interface between one or more processors and other interface modules, which may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.

[0144] The communication component is used for wired or wireless communication between the electronic device and other devices. Wired communication includes communication through network ports, serial ports, etc.; wireless communication includes: Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, 5G, or one or a combination of them.

[0145] In addition, it should be understood that the method or system disclosed in the embodiments provided in the present disclosure may also be implemented in other ways. The method or system embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the methods and systems according to the multiple embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram may represent a module, a computer program segment or a part of a computer program, and the module, computer program segment or a part of a computer program includes one or more computer programs for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings, and may actually be executed substantially in parallel, and they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, may be implemented with a dedicated hardware-based system that performs the specified functions or actions, or may be implemented with a combination of dedicated hardware and computer programs.

[0146] In the present disclosure, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, device or equipment including the elements; if there is a description of "first", "second", etc., it is only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features; in the description of the present disclosure, unless otherwise specified, the terms "multiple" and "multiple" mean at least two; if there is a description of a server, it should be noted that the server can be an independent physical server or terminal, or a server cluster composed of multiple physical servers, or a cloud server that can provide basic cloud computing services such as cloud servers, cloud databases, cloud storage and CDN; if there is a description of a smart terminal or mobile device in the present disclosure, it should be noted that the smart terminal or mobile device can be a mobile phone, a tablet computer, a smart watch, a netbook, a wearable electronic device, a personal digital assistant (PDA), an augmented reality technology device (AR), a virtual reality device (VR), a smart TV, a smart speaker, a personal computer (PC), a tablet computer, a smart phone, a smart TV, a smart speaker, a smart phone ... Computer, referred to as PC), etc., but not limited to this, the present disclosure does not specifically limit the specific form of the smart terminal or mobile device.

[0147] Finally, it should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "an example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0148] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary, and the contents described are only embodiments adopted for facilitating the understanding of the present disclosure, and are not intended to limit the present disclosure. Any technician in the technical field to which the present disclosure belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present disclosure, but the protection scope of the present disclosure shall still be based on the scope defined by the attached claims.

Claims

1. A pixel structure, characterized in that: include: A cathode, an anode and a light-emitting layer located between the cathode and the anode are arranged on a substrate, wherein the light-emitting layer includes a first light-emitting layer and a second light-emitting layer arranged in sequence along the thickness direction of the substrate, the first light-emitting layer and the second light-emitting layer emit light of different colors, and the cathode and the anode are used to respectively control the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

2. The pixel structure according to claim 1, characterized in that: Also includes: an intermediate electrode located between the first light-emitting layer and the second light-emitting layer; The cathode, the middle electrode and the anode are used to respectively control the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

3. The pixel structure according to claim 2, characterized in that: The intermediate electrode is a multi-layer structure, and includes an electron injection layer, a metal-organic mixed layer and a hole injection layer which are sequentially arranged along the thickness direction of the substrate. 4 . The pixel structure according to claim 1 , wherein the first light-emitting layer is a red light-emitting layer, and the second light-emitting layer is an orange light-emitting layer.

5. An OLED display panel, characterized in that: include: A substrate, comprising a plurality of pixels, wherein the plurality of pixels include a target pixel, wherein the target pixel includes a cathode, an anode and a light-emitting layer located between the cathode and the anode, the light-emitting layer including a first light-emitting layer and a second light-emitting layer sequentially arranged along a thickness direction of the substrate, and the first light-emitting layer and the second light-emitting layer emit light of different colors; The driving circuit is connected to the cathode and the anode and is used to drive the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

6. The OLED display panel according to claim 5, characterized in that: The target pixel further includes an intermediate electrode located between the first light emitting layer and the second light emitting layer; The driving circuit is connected to the cathode, the middle electrode and the anode, and is used to drive the first light-emitting layer and the second light-emitting layer to emit light in different time periods.

7. The OLED display panel according to claim 6, characterized in that: The driving circuit includes a first driving circuit and a second driving circuit. The first driving circuit is connected to the cathode and the middle electrode, and is used to drive the first light-emitting layer to emit light in a first time period; the second driving circuit is connected to the anode and the middle electrode, and is used to drive the second light-emitting layer to emit light in a second time period.

8. The OLED display panel according to claim 6, characterized in that: The intermediate electrode is a multi-layer structure, and includes an electron injection layer, a metal-organic mixed layer and a hole injection layer which are sequentially arranged along the thickness direction of the substrate.

9. The OLED display panel according to claim 5, characterized in that: The driving circuit provides different voltages to the anode in different time periods to respectively drive the first light-emitting layer and the second light-emitting layer to emit light.

10. The OLED display panel according to any one of claims 5 to 9, characterized in that: The first light-emitting layer is a red light-emitting layer, and the second light-emitting layer is an orange light-emitting layer.

11. A display device, characterized in that: include: The OLED display panel according to any one of claims 5 to 10.

12. The display device according to claim 11, characterized in that: Also includes: Light sensor, used to obtain the current light intensity; The controller is connected to the light sensor and the driving circuit, and is used to determine the current time period according to the current light intensity obtained by the light sensor, and control the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period.

13. A method for driving a display device according to claim 11 or 12, characterized in that: include: The control driving circuit drives the first light emitting layer or the second light emitting layer of the OLED display panel to emit light in different time periods.

14. The driving method according to claim 13, characterized in that: Also includes: Get the current light intensity through the light sensor; Determine a current time period according to the current light intensity; The control driving circuit drives the first light emitting layer or the second light emitting layer of the OLED display panel to emit light in different time periods, including: Based on the current time period, the driving circuit is controlled to drive the first light-emitting layer or the second light-emitting layer to emit light.

15. The driving method according to claim 13, characterized in that: The controlling the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period includes: Based on a preset driving strategy, determining a target light-emitting layer corresponding to the current time period from the first light-emitting layer and the second light-emitting layer; Obtaining a driving voltage corresponding to the target light-emitting layer; The driving circuit is controlled to provide the driving voltage to the anode to drive the target light emitting layer to emit light.

16. The driving method according to claim 14, characterized in that: The driving circuit includes a first driving circuit and a second driving circuit, the first driving circuit is connected to the cathode and the middle electrode, and the second driving circuit is connected to the anode and the middle electrode; and the step of controlling the driving circuit to drive the first light-emitting layer or the second light-emitting layer to emit light based on the current time period includes: When the current time period is the first time period, the anode and the middle electrode are controlled to be in an open circuit state, the cathode and the middle electrode are controlled to be in a closed circuit state, and the first driving circuit is controlled to provide a first driving voltage to the middle electrode to drive the first light-emitting layer to emit light; When the current time period is the second time period, the cathode and the middle electrode are controlled to be in an open circuit state, the anode and the middle electrode are controlled to be in a closed circuit state, and the second driving circuit is controlled to provide a second driving voltage to the anode to drive the second light-emitting layer to emit light.

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