Display panel and display device

Abstract

The invention discloses a display panel and a display device, relates to the technical field of display, and can improve the light extraction efficiency. The display panel comprises a driving substrate and a light-emitting device layer, wherein the light-emitting device layer is arranged on one side of the driving substrate; the light-emitting device layer comprises a pixel defining layer, a first light-emitting layer and a second light-emitting layer, the pixel defining layer is provided with a plurality of pixel openings, the first light-emitting layer is arranged in the pixel openings, and the second light-emitting layer is arranged on the inner walls of the pixel openings; the second light-emitting layer is arranged between the pixel defining layer and the first light-emitting layers, and the first light-emitting layers corresponding to two adjacent pixel openings are disconnected; the second light-emitting layer is used for emitting second light under the action of first light, the first light is light emitted by the first light-emitting layer, and the color of the first light is the same as that of the second light.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] Currently, AMOLED (Active-matrix organic light-emitting diode) and QLED (Quantum Dot Light Emitting Diodes) self-emissive display technologies are developing rapidly. In particular, AMOLED technology has advantages such as wider color gamut, faster response speed, wider viewing angle, and foldability compared to the commonly used LCD (Liquid Crystal Display), and is widely used.

[0003] However, under the law of refraction, when light travels from a medium with a high refractive index to a medium with a low refractive index, the angle of incidence is smaller than the angle of refraction. When light travels from a medium with a low refractive index to a medium with a high refractive index, the angle of incidence is larger than the angle of refraction. When light travels from an optically denser medium to a optically less dense medium, if the angle of incidence is greater than the critical angle, the light will be totally internally reflected and will not travel into the optically less dense medium.

[0004] For OLED (Organic Light-Emitting Diode) light-emitting devices, whether light can pass from the device into the air and be perceived by the human eye depends on the refractive index of the light-emitting layer, the refractive index of the air, and the refraction angle of the light beam. When the light-emitting layer exits into a less optically sensitive medium, the light is easily unable to exit into the air due to total internal reflection, meaning that some of the light is absorbed, resulting in low light extraction efficiency of the display panel.

[0005] In summary, improving the light extraction efficiency of devices is an urgent problem to be solved. Summary of the Invention

[0006] The present application provides a display panel and display device that can improve light emission efficiency.

[0007] A first aspect of this application provides a display panel, including:

[0008] A driving substrate and a light-emitting device layer, wherein the light-emitting device layer is disposed on one side of the driving substrate;

[0009] The light-emitting device layer includes a pixel defining layer, a first light-emitting layer, and a second light-emitting layer. The pixel defining layer is provided with multiple pixel openings. The first light-emitting layer is disposed inside the pixel openings, and the second light-emitting layer is disposed on the inner wall of the pixel openings. The second light-emitting layer is disposed between the pixel defining layer and the first light-emitting layer. The first light-emitting layers corresponding to two adjacent pixel openings are disconnected.

[0010] The second light-emitting layer is used to emit a second light under the action of the first light, wherein the first light is the light emitted by the first light-emitting layer, and the first light and the second light have the same color.

[0011] In some embodiments, the orthographic projection of the pixel defining layer on the driving substrate surrounds the orthographic projection of the first light-emitting layer on the driving substrate.

[0012] In some embodiments, the distance between the side of the pixel defining layer away from the driving substrate and the driving substrate is a first distance, and the distance between the side of the second light-emitting layer away from the driving substrate and the driving substrate is a second distance;

[0013] The first distance is greater than or equal to the second distance.

[0014] In some embodiments, the dimension of the second light-emitting layer in the first direction is larger than the dimension of the first light-emitting layer in the first direction;

[0015] The first direction is the direction perpendicular to the plane where the driving substrate is located.

[0016] In some embodiments, the distance between the end of the second light-emitting layer near the driving substrate and the driving substrate is a third distance, and the distance between the side of the first light-emitting layer near the driving substrate and the driving substrate is a fourth distance.

[0017] The third distance is less than or equal to the fourth distance.

[0018] In some embodiments, the second light-emitting layer comprises a quantum dot material; and / or,

[0019] The first light-emitting layer comprises quantum dot material; and / or,

[0020] The pixel defining layer includes light-blocking materials and / or light-absorbing materials.

[0021] In some embodiments, the light-emitting device layer includes a first electrode, a hole transport layer, an electron transport layer, and a second electrode;

[0022] The hole transport layer is located between the first electrode and the first light-emitting layer, and the electron transport layer is located between the first light-emitting layer and the second electrode.

[0023] A portion of the electron transport layer and a portion of the hole transport layer are disposed on the inner wall of the pixel opening. The second light-emitting layer is located between the pixel defining layer and the hole transport layer, and a portion of the hole transport layer is located between the second light-emitting layer and the electron transport layer.

[0024] In some implementations, the hole transport layers corresponding to adjacent pixel apertures are interconnected; and / or,

[0025] The electron transport layers corresponding to adjacent pixel openings are interconnected; and / or

[0026] The second electrodes corresponding to adjacent pixel openings are interconnected.

[0027] In some embodiments, the pixel defining layer includes a first defining structure and a second defining structure, the second defining structure being disposed on the side of the first defining structure away from the driving substrate, and the second defining structure being connected to the end of the first defining structure away from the driving substrate.

[0028] The orthographic projection of the end of the first defining structure furthest from the driving substrate onto the driving substrate is the first projection, and the orthographic projection of the end of the second defining structure closest to the driving substrate onto the driving substrate is the second projection. The first projection falls within the second projection.

[0029] In some embodiments, the first defining structure has a first dimension in the first direction, the second defining structure has a second dimension in the first direction, the first dimension is larger than the second dimension, and the first direction is a direction perpendicular to the plane where the driving substrate is located; and / or,

[0030] The dimension of the end of the first defining structure closest to the driving substrate in the second direction is the third dimension, the dimension of the end of the first defining structure furthest from the driving substrate in the second direction is the fourth dimension, and the dimension of the end of the second defining structure closest to the driving substrate in the second direction is the fifth dimension. The third dimension is larger than the fourth dimension, and the fifth dimension is larger than the fourth dimension. The second direction is the direction of the line connecting adjacent pixel openings.

[0031] In some embodiments, the second light-emitting layer is connected to the first defining structure;

[0032] The distance between the end of the second light-emitting layer furthest from the driving substrate and the driving substrate is the second distance, and the distance between the end of the first defining structure furthest from the driving substrate and the driving substrate is the fifth distance. The second distance is less than or equal to the fifth distance.

[0033] In some implementations, the ratio of the fifth distance to the second distance is greater than or equal to 2.

[0034] In some embodiments, a second electrode is provided on the side of the light-emitting layer away from the driving substrate, and the second electrodes corresponding to adjacent pixel openings are disconnected.

[0035] The distance between the side of the second electrode away from the driving substrate and the driving substrate is the sixth distance, which is less than the fifth distance.

[0036] In some embodiments, a dielectric layer is also included, which is disposed between the second light-emitting layer and the pixel defining layer. The dielectric layer is connected to the second light-emitting layer, and the refractive index of the dielectric layer is less than that of the second light-emitting layer and greater than that of air.

[0037] The distance between the side of the pixel defining layer away from the driving substrate and the driving substrate is the first distance, and the distance between the end of the dielectric layer away from the driving substrate and the driving substrate is the seventh distance, and the seventh distance is greater than or equal to the first distance.

[0038] In some implementations, the thickness of the dielectric layer in the third direction is λ / 4, where λ is the wavelength of the first light emitted from the first light-emitting layer, and the third direction is the direction perpendicular to the sidewall of the pixel opening.

[0039] In some embodiments, a filter is included, which is disposed on the side of the light-emitting device layer away from the driving substrate;

[0040] The filter includes a light-shielding structure and a filter layer. The light-shielding structure includes multiple cutouts. The filter layer is disposed in the cutouts. The orthographic projection of the cutouts on the driving substrate covers the orthographic projection of the pixel opening on the driving substrate. The orthographic projection of the light-shielding structure on the driving substrate falls into the orthographic projection of the pixel defining layer on the driving substrate.

[0041] The orthographic projections of the first and second light-emitting layers on the driving substrate both fall within the orthographic projection of the cutouts on the driving substrate.

[0042] A second aspect of this application provides a display device, including the display panel in any of the above-described technical solutions.

[0043] The beneficial effects of this application are as follows:

[0044] This application provides a second light-emitting layer on the wall of the pixel-defining layer facing the first light-emitting layer. The first light emitted from the first light-emitting layer to the second light-emitting layer can excite the second light-emitting layer to generate a second light. The first light emitted from the first light-emitting layer with a wide viewing angle can excite the second light-emitting layer to emit a second light. Since the second light has the same color as the first light, the wide viewing angle light emitted from the first light-emitting layer can be fully utilized, which can increase the light output of the display panel and thus improve the light output efficiency of the display panel. Attached Figure Description

[0045] Figure 1 A schematic partial structural diagram of a display panel provided in an embodiment of this application;

[0046] Figure 2 A schematic partial structural diagram of another display panel provided in an embodiment of this application;

[0047] Figure 3A schematic partial structural diagram of another display panel provided in an embodiment of this application;

[0048] Figure 4 A schematic diagram of the spectral curve of a second emitting layer provided in an embodiment of this application;

[0049] Figure 5 A flowchart illustrating the fabrication process of a display panel provided in this application embodiment;

[0050] Figure 6 A schematic partial structural diagram of another display panel provided in an embodiment of this application;

[0051] Figure 7 A schematic partial structural diagram of another display panel provided in an embodiment of this application;

[0052] Figure 8 for Figure 7 Enlarged view of the structure at point A in the image;

[0053] Figure 9 A schematic partial structural diagram of another display panel provided in an embodiment of this application;

[0054] Figure 10 A schematic partial structural diagram of another display panel provided in an embodiment of this application;

[0055] Figure 11 This is a schematic partial structural diagram of a display device provided in an embodiment of this application.

[0056] The reference numerals in the figure represent:

[0057] 100, Driving substrate; 200, Light-emitting device layer; 210, Pixel defining layer; 211, Pixel aperture; 212, First defining structure; 213, Second defining structure; 220, First light-emitting layer; 230, Second light-emitting layer; 240, First electrode; 250, Hole transport layer; 260, Electron transport layer; 270, Second electrode; 280, Dielectric layer; 310, Filter; 311, Light-shielding structure; 311-1, Hollowed-out; 312, Filter Light layer; 400, display panel; 500, display device; L1, first ray; L2, second ray; X, first direction; Y, second direction; Z, third direction; D1, first distance; D2, second distance; D3, third distance; D4, fourth distance; D5, fifth distance; D6, sixth distance; D7, seventh distance; H2101, first dimension; H2, second dimension; H3, third dimension; H4, fourth dimension; H5, fifth dimension. Detailed Implementation

[0058] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0059] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0060] The present application provides a display panel and display device that can improve light emission efficiency.

[0061] The first aspect of this application, Figure 1 This is a schematic partial structural diagram of a display panel provided in an embodiment of this application, with reference to... Figure 1 A display panel is provided, including a driving substrate 100 and a light-emitting device layer 200, wherein the light-emitting device layer 200 is disposed on one side of the driving substrate 100.

[0062] In some examples, reference Figure 1 The light-emitting device layer 200 includes a pixel defining layer 210, a first light-emitting layer 220, and a second light-emitting layer 230. The pixel defining layer 210 has multiple pixel openings 211. The first light-emitting layer 220 is disposed within each pixel opening 211, and the second light-emitting layer 230 is disposed on the inner wall of each pixel opening 211, located in the area between the pixel defining layer 210 and the first light-emitting layer 220. The first light-emitting layers 220 corresponding to two adjacent pixel openings 211 are disconnected. The pixel openings 211 define different light-emitting devices, and the first light-emitting layers 220 of different light-emitting devices are not connected, thus preventing lateral leakage current transmission between light-emitting layers.

[0063] For example, refer to Figure 1The pixel opening 211 is a cutout that penetrates the pixel defining layer 210. The first light-emitting layer 220 is disposed inside the pixel opening 211. The first light-emitting layer 220 can be excited by electrodes to emit light. Since the second light-emitting layer 230 is disposed on the inner wall of the pixel opening 211, part of the first light emitted by the first light-emitting layer 220 can illuminate the second light-emitting layer 230. The first light can excite the second light-emitting layer 230 to emit light, resulting in a second light L2. The second light L2 has the same color as the first light L1. The first light L1 with a wide viewing angle can be converted into the second light L2 for emission, thereby increasing the amount of emitted light and improving the light emission efficiency of the display panel.

[0064] For example, refer to Figure 1 The adjacent first light-emitting layers 220 are disconnected, and each adjacent first light-emitting layer 220 can emit light beams of the same color, for example, both emitting red light beams. Alternatively, each adjacent first light-emitting layer 220 can emit light beams of different colors, for example, red light beams, green light beams, and blue light beams respectively. Since the first light-emitting layers 220 are disconnected, optical crosstalk between the light beams emitted by adjacent first light-emitting layers 220 is avoided.

[0065] In some examples, reference Figure 1 The second light-emitting layer 230 can emit a second light ray L2 under the action of the first light ray L1. The first light ray L1 is the light emitted by the first light-emitting layer 220, and the second light ray L2 is the light emitted by the second light-emitting layer 230. The first light ray L1 and the second light ray L2 have the same color.

[0066] For example, the light emitted from the first light-emitting layer 220 may include a first light ray L1. The first light ray L1 can be light that undergoes total internal reflection in optically denser and optically less dense media, and the first light ray L1 can be understood as a portion of the light emitted from the first light-emitting layer 220, such as wide-viewing-angle light. The second light-emitting layer 230 disposed on the inner wall of the pixel opening 211 can receive more light from the first light-emitting layer 220, such as the first light ray L1, and use the first light ray L1 to excite and emit a second light ray L2, so that the second light ray L2 passes through the second light-emitting layer 230 and is emitted into the air, thereby improving the luminous efficiency of the display panel 400 through the second light-emitting layer 230.

[0067] For example, the first light ray L1 and the second light ray L2 need to be the same color, so as to avoid the light emitted from the first light-emitting layer 220 into the air and the second light ray L2 affecting the display color due to different colors.

[0068] For example, the second light-emitting layer 230 can be a photoluminescent layer. The second light-emitting layer 230 can emit a second light ray L2 by being excited by the first light ray L1, and the emission angle of the second light ray L2 can be various angles. That is, the second light-emitting layer 230 can increase the light output of the display panel 400 and emit light with a wide viewing angle at the same time.

[0069] In some examples, reference Figure 1 , Figure 1 The first direction X is perpendicular to the plane where the driving substrate 100 is located, and the second direction Y is the direction of the line connecting adjacent pixel openings 211.

[0070] It should be noted that whether light emitted from the emissive layer can reach the air depends on the refractive index of the organic light-emitting material and the emission angle of the light. Typically, the refractive indices of the organic light-emitting material films, such as the pixel boundary layer and the emissive layer, differ significantly from those of air. Therefore, when the emission angle of the light from the emissive layer is large, the light is prone to total internal reflection within the device and cannot reach the air, resulting in absorption or loss of the emitted light and thus low light extraction efficiency. Conversely, when the refractive indices of the emissive layer and the pixel boundary layer are relatively similar, more light emitted from the emissive layer can reach the pixel boundary layer.

[0071] refer to Figure 1 In the display panel 400 of this application, a second light-emitting layer 230 is disposed on the wall of the pixel defining layer 210 facing the first light-emitting layer 220. A first light ray L1 emitted from the first light-emitting layer 220 to the second light-emitting layer 230 can excite the second light-emitting layer 230 to generate a second light ray L2. For example, when a wide-viewing-angle light irradiates the pixel defining layer 210, total internal reflection occurs, preventing it from escaping into the air. However, when a wide-viewing-angle light irradiates the second light-emitting layer 230, it excites the second light-emitting layer 230 to emit the second light ray L2, which can then escape into the air. This increases the light output of the light-emitting device, allowing the wide-viewing-angle light emitted from the first light-emitting layer 220 to be fully utilized, thereby increasing the light output of the display panel 400 and improving its light extraction efficiency. The second light ray L2 is the same color as the first light ray L1, thus avoiding optical crosstalk between the first light ray L1 and the second light ray L2 within the same pixel opening 211, which would affect the light extraction effect of the light-emitting device. The first light-emitting layers 220 corresponding to adjacent pixel openings 211 are disconnected, and there is no interference problem between adjacent first light-emitting layers 220.

[0072] Figure 2 This is a schematic partial structural diagram of another display panel provided in an embodiment of this application. In some examples, reference is made to... Figure 2The light-emitting device layer 200 includes a first electrode 240, a hole transport layer 250, an electron transport layer 260, and a second electrode 270. The hole transport layer 250 is located between the first electrode 240 and the first light-emitting layer 220, and the electron transport layer 260 is located between the first light-emitting layer 220 and the second electrode 270. A portion of the electron transport layer 260 and a portion of the hole transport layer 250 are disposed on the inner wall of the pixel opening 211. The second light-emitting layer 230 is disposed between the pixel defining layer 210 and the hole transport layer 250, and a portion of the hole transport layer 250 is disposed between the second light-emitting layer 230 and the electron transport layer 260.

[0073] For example, the hole transport layer may further include a hole transport thin film layer and a hole generation thin film layer, and the electron transport layer may further include an electron transport thin film layer and an electron injection thin film layer.

[0074] For example, refer to Figure 2 The first electrode 240 and the second electrode 270 are respectively disposed on both sides of the first light-emitting layer 220. The first electrode 240 and the second electrode 270 can be used as the anode and the cathode, respectively. The first electrode 240 can be electrically connected to the pixel circuit, thereby driving the light-emitting layer to emit light through the pixel circuit, thereby realizing the screen display function.

[0075] For example, the first electrode can serve as the anode and the second electrode can serve as the cathode. The first electrode, the second electrode, the first light-emitting layer, the hole transport layer, and the electron transport layer can form a light-emitting device.

[0076] In some examples, reference Figure 2 The hole transport layers 250 corresponding to adjacent pixel openings 211 are interconnected, that is, the hole transport layers 250 of different light-emitting devices are interconnected.

[0077] In some examples, reference Figure 2 The electron transport layers 260 corresponding to adjacent pixel openings 211 are interconnected, that is, the electron transport layers 260 of different light-emitting devices are interconnected.

[0078] In some examples, reference Figure 2 The second electrodes corresponding to adjacent pixel openings are interconnected, meaning that the second electrodes of different light-emitting devices are interconnected.

[0079] In some examples, reference Figure 2 The hole transport layers 250 corresponding to adjacent pixel openings 211 are interconnected, and the electron transport layers 260 corresponding to adjacent pixel openings 211 are interconnected. The first light-emitting layers 220 of different light-emitting devices are disconnected, and the hole transport layers 250 and electron transport layers 260 of different light-emitting devices are continuously arranged.

[0080] In some examples, reference Figure 2 The orthographic projection of the pixel defining layer 210 on the driving substrate 100 surrounds the orthographic projection of the first light-emitting layer 220 on the driving substrate 100.

[0081] For example, refer to Figure 2 The first light-emitting layer 220 is disposed within the pixel opening 211. Adjacent first light-emitting layers 220 are disconnected. The orthographic projection of the pixel defining layer 210 surrounds the orthographic projection of the first light-emitting layer 220. That is, there is a certain gap between the second light-emitting layer 230 and the first light-emitting layer 220, allowing the second light-emitting layer 230 to receive more light emitted from the first light-emitting layer 220.

[0082] For example, a portion of the first light-emitting layer may be attached to the sidewall of the pixel opening.

[0083] In some examples, the distance between the side of the pixel defining layer away from the driving substrate and the driving substrate is the first distance, and the distance between the side of the second light-emitting layer away from the driving substrate and the driving substrate is the second distance. The first distance is greater than or equal to the second distance, that is, with the driving substrate as the reference plane, the height of the pixel defining layer can be greater than or equal to the height of the second light-emitting layer.

[0084] For example, refer to Figure 2 The distance between the side of the pixel defining layer 210 away from the driving substrate 100 and the driving substrate 100 is the first distance D1, and the distance between the side of the second light-emitting layer 230 away from the driving substrate 100 and the driving substrate 100 is the second distance D2. The first distance D1 is equal to the second distance D2.

[0085] Figure 3 This is a schematic partial structural diagram of another display panel provided in an embodiment of this application. For example, refer to... Figure 3 The first distance D1 is greater than the second distance D2, and there is a difference between the first distance D1 and the second distance D2, which creates a gap between the pixel defining layer 210 and the second light-emitting layer 230. This gap can be used to form other film layers, such as the second electrode 270. Light emitted from the first light-emitting layer 220 can illuminate the second light-emitting layer 230 and the pixel defining layer 210, thereby improving the light extraction efficiency of the display panel through the second light-emitting layer 230.

[0086] For example, refer to Figure 3The first distance D1 is greater than the second distance D2. The height of the side of the second light-emitting layer 230 away from the driving substrate 100 is greater than the height of the side of the pixel-defining layer 210 away from the driving substrate 100. That is, the pixel-defining layer 210 is higher than the second light-emitting layer 230, so that the second light ray L2 emitted from the second light-emitting layer 230 is blocked by the pixel-defining layer 210. In other words, in the second direction Y, the pixel-defining layer 210 avoids the optical crosstalk phenomenon between the second light rays L2 emitted from the second light-emitting layers 230 on both sides.

[0087] In some examples, reference Figure 3 The second light-emitting layer 230 has a larger dimension in the first direction X than the first light-emitting layer 220 in the first direction X, where the first direction X is perpendicular to the plane of the driving substrate 100.

[0088] For example, refer to Figure 2 With the plane where the driving substrate 100 is located as the reference plane, the height of the second light-emitting layer 230 is higher than the height of the first light-emitting layer 220. Therefore, a larger number of first light rays L1 with a wide viewing angle emitted by the first light-emitting layer 220 can illuminate the second light-emitting layer 230, and the second light-emitting layer 230 can further emit second light rays L2.

[0089] In some examples, the distance between the end of the second light-emitting layer closest to the driving substrate and the driving substrate is the third distance, and the distance between the side of the first light-emitting layer closest to the driving substrate and the driving substrate is the fourth distance, wherein the third distance is less than or equal to the fourth distance.

[0090] For example, refer to Figure 2 With the plane of the driving substrate 100 as the reference plane, the distance between the second light-emitting layer 230 and the driving substrate 100 is less than the distance between the first light-emitting layer 220 and the driving substrate 100. Therefore, the second light-emitting layer 230 can receive more light emitted from the first light-emitting layer 220, for example, more first light rays L1. After the second light-emitting layer 230 is excited by more first light rays L1, it can emit more second light rays L2, meaning more light can be emitted into the air, thereby improving the light extraction efficiency of the display panel 400.

[0091] In some examples, the second light-emitting layer includes quantum dot materials.

[0092] In some examples, the first light-emitting layer comprises quantum dot materials.

[0093] In some examples, the pixel-defining layer includes a light-blocking material, which blocks light rays that strike the pixel-defining layer. For instance, a first light-emitting layer emits a first light ray with a wide viewing angle, while a second light-emitting layer absorbs the first light ray and emits a second light ray. This second light ray has a closer viewing angle than the first light ray, meaning more of the second light ray enters the human eye. Simultaneously, the second light-emitting layer emits light rays with a wide viewing angle, which are blocked by the pixel-defining layer, thus preventing optical crosstalk in the light-emitting device.

[0094] In some examples, the pixel-defining layer includes a light-absorbing material, which absorbs light rays that strike it. For instance, a first light-emitting layer emits a first light ray with a wide viewing angle, while a second light-emitting layer absorbs the first light ray and emits a second light ray. This second light ray has a closer viewing angle than the first light ray, meaning more of the second light ray enters the human eye. Simultaneously, the second light-emitting layer emits light rays with a wide viewing angle, which are absorbed by the pixel-defining layer, thus preventing optical crosstalk in the light-emitting device.

[0095] In some examples, the second light-emitting layer comprises quantum dot material, the first light-emitting layer comprises quantum dot material, and the pixel-defining layer comprises light-shielding material and light-absorbing material.

[0096] For example, a quantum dot is a nanoscale semiconductor crystal that can reach an excited state when charge carriers in the material absorb external energy, such as light or electricity. During the return of the charge carriers to the ground state, energy is released in the form of light. The emission spectrum of a quantum dot can be controlled by changing its size.

[0097] In some examples, by changing the size and chemical composition of the quantum dots, the second light-emitting layer can emit a second light in any wavelength band.

[0098] It should be noted that, compared to conventional semiconductors, quantum dots also have characteristics such as broadband continuous absorption, narrow-band symmetrical emission, high photochemical stability, and long fluorescence lifetime.

[0099] For example, the emission wavelength of quantum dots is controlled by their composition and radius, and the corresponding quantum dots can be selected according to the wavelengths of the red, green and blue light emitted by the device.

[0100] In some examples, quantum dots can be multilayer core-shell structured quantum dots such as CdSe, PbS, InP, and InP / ZnSe, InP / ZnSe / ZnSeS, InP / ZnSe / ZnSeS / ZnS.

[0101] For example, the selection of quantum dots needs to follow the rule of absorbing blue light and emitting blue light, or absorbing red light and emitting red light, or absorbing green light and emitting green light. Quantum dots or quantum dot layers can be added to a pixel according to actual needs, thereby improving the light emission efficiency of the display panel. For example, using quantum dots of the same color can correspond to one type of pixel, such as a red pixel, a green pixel, or a blue pixel; or different colored quantum dots can correspond to several types of pixels, such as red and green pixels, red and blue pixels, green and blue pixels, or red pixels, green and blue pixels.

[0102] Figure 4 This is a schematic diagram of the spectral curve of the second emitting layer provided in an embodiment of this application. For example, refer to... Figure 4 , Figure 4 The horizontal axis represents wavelength in nm, the left vertical axis represents absorption intensity, and the right vertical axis represents emission intensity. The unit of the vertical axis is au, which can represent the relative magnitude of the spectrum. Figure 4 This can be the absorption and emission spectra of the green pixels corresponding to the second emitting layer. Figure 4 This indicates that the second emitting layer can absorb light from 425nm to 550nm and emit light from 475nm to 600nm, with an emission peak at 530nm, that is... Figure 4 The green pixel spectrum emitted by the second light-emitting layer has a high degree of overlap with the electroluminescence spectrum of the first light-emitting layer, which allows the second light-emitting layer to absorb light that cannot be emitted into the air due to total internal reflection and emit the light of the corresponding pixel, thereby improving the light output efficiency of the display panel.

[0103] In some examples, the re-emission of the second light-emitting layer can be achieved when the absorption and emission spectra of the second light-emitting layer overlap with the electroluminescence spectrum of the first light-emitting layer.

[0104] For example, by modulating the material of the second light-emitting layer and the particle size of the quantum dots, the absorption spectrum of the second light-emitting layer can be made wider and the emission spectrum narrower, thereby adapting it to the light emitted by the first light-emitting layer.

[0105] In some examples, the pixel delimiter layer can be set to black to avoid optical crosstalk.

[0106] For example, black resin can be used in the pixel defining layer so that the pixel defining layer appears black, and less light emitted from the first light-emitting layer and the second light-emitting layer passes through the pixel defining layer.

[0107] Figure 5 This is a flowchart illustrating the fabrication process of a display panel according to an embodiment of this application. See also: [link to relevant documentation] Figure 5A second light-emitting layer material can be deposited on one side of the driving substrate 100, and a second light-emitting layer 230 can be formed by exposure and development. Then, a pixel-defining layer material is deposited on the side of the driving substrate 100 facing the second light-emitting layer 230, and a pixel-defining layer 210 can be formed by exposure and development.

[0108] In some examples, reference Figure 3 and Figure 5 The pixel defining layer 210 can be formed with a narrow top and a wide bottom structure. The upper part refers to the side of the pixel defining layer 210 away from the driving substrate 100, and the lower part refers to the side of the pixel defining layer 210 close to the driving substrate 100.

[0109] For example, refer to Figure 5 , Figure 5 In the example, the second light-emitting layer 230 emits light of the same color, and therefore can be formed in a single exposure and development. In the case where multiple second light-emitting layers 230 can emit light of different colors, Figure 5 Based on the single exposure and development in the example, another second light-emitting layer material can be deposited on the side of the driving substrate 100 facing the second light-emitting layer 230, and two second light-emitting layers 230 on the sidewall surface of the same pixel defining layer 210 can be formed through exposure and development. Then, another second light-emitting layer material is deposited on the side of the driving substrate 100 facing the second light-emitting layer 230, and a third second light-emitting layer 230 is formed through exposure and development.

[0110] For example, refer to Figure 5 The two second light-emitting layers 230 corresponding to the sidewalls of the pixel defining layer 210 can have the same height in the first direction X, and the three types of second light-emitting layers 230 can emit red, blue and green light respectively. The two second light-emitting layers 230 on the sidewalls of the same pixel defining layer 210 can emit light of the same color or emit light of different colors.

[0111] For example, the manufacturing process of a display panel also includes a vapor deposition process, which can be used to form a hole transport layer, an electron transport layer, a light-emitting layer, and a second electrode.

[0112] For example, the height of the pixel defining layer in the first direction is greater than the height of the second light-emitting layer in the first direction, and the pixel defining layer can be rendered as black.

[0113] Figure 6 This is a schematic partial structural diagram of another display panel provided in an embodiment of this application. In some examples, reference is made to... Figure 6The pixel defining layer 210 includes a first defining structure 212 and a second defining structure 213. The second defining structure 213 is disposed on the side of the first defining structure 212 away from the driving substrate 100. The second defining structure 213 is connected to the end of the first defining structure 212 away from the driving substrate 100.

[0114] In some examples, the orthographic projection of the end of the first defining structure furthest from the driving substrate onto the driving substrate is the first projection, and the orthographic projection of the end of the second defining structure closest to the driving substrate onto the driving substrate is the second projection, with the first projection falling within the second projection.

[0115] For example, refer to Figure 6 The maximum width of the second defining structure 213 in the second direction Y is greater than the maximum width of the first defining structure 212 in the second direction Y. For example, the width of the side of the second defining structure 213 near the driving substrate 100 in the second direction Y is greater than the maximum width of the first defining structure 212 in the second direction Y.

[0116] For example, refer to Figure 6 The width of the side of the second defining structure 213 away from the driving substrate 100 in the second direction Y is greater than the maximum width of the first defining structure 212 in the second direction Y. The first defining structure 212 and the second defining structure 213 can form an undercut structure. A step structure can be formed at the connection between the first defining structure 212 and the second defining structure 213. The step structure makes it difficult for the film layer on the side of the pixel defining layer 210 away from the driving substrate 100 to connect with the sidewall of the pixel defining layer 210. That is, the two film layers of the pixel defining layer 210 in the first direction X have a step, so that there is no common layer between multiple pixels of the display panel 400, thereby reducing or preventing the occurrence of optical crosstalk.

[0117] In some examples, the thickness of the second light-emitting layer and the thickness of the vapor-deposited film layer are less than or equal to the height of the end of the first defining structure away from the driving substrate. The vapor-deposited film layer may include a first electrode, a hole transport layer, an electron transport layer, and a second electrode.

[0118] For example, refer to Figure 6The second light-emitting layer 230 can be formed on the driving substrate 100 by photolithography or mask evaporation. The pixel defining layer 210 and the second light-emitting layer 230 are formed on the side away from the driving substrate 100 by evaporation. Therefore, the maximum thickness of the second light-emitting layer 230 and the evaporation layer in the first direction X can be limited by the height of the first defining structure 212, thereby confining the second light-emitting layer 230 and the evaporation layer in the pixel opening 211 for protection by the adjacent pixel defining layer 210, for example, by blocking the light emitted from the adjacent first light-emitting layer 220 by the pixel defining layer 210.

[0119] For example, refer to Figure 6 A step structure can be formed between the first defining structure 212 and the second defining structure 213 on the inner wall of the pixel opening 211. This step structure can block the current transmitted in the film layer along the first direction X and the second direction Y, thereby avoiding crosstalk between pixels caused by lateral leakage current, which would affect the display effect of the panel. In addition, the height of the pixel defining layer 210 along the first direction X is greater than that of the light-emitting device layer 200, and the pixel defining layer 210 can block light crosstalk along the second direction Y.

[0120] For example, refer to Figure 6 The pixel defining layer 210 can also act as an isolation pillar to block the propagation of lateral stress in the display panel 400. For example, the pixel defining layer 210 with a step structure can block moisture intrusion. For instance, a moisture intrusion channel may be formed in the film layer on the side of the pixel defining layer 210 away from the driving substrate 100. The step structure of the pixel defining layer 210 creates a step in the film layer, making it difficult for moisture to continue propagating through the step, or the film layer may be broken at the step structure, making it difficult for moisture to continue propagating.

[0121] In some examples, reference Figure 6 The first defining structure 212 has a first dimension H1 in the first direction X, and the second defining structure 213 has a second dimension H2 in the first direction X. The first dimension H1 is greater than the second dimension H2. The first direction X is a direction perpendicular to the plane where the driving substrate 100 is located.

[0122] In some examples, reference Figure 6 The first defining structure 212 has a third dimension H3 at one end near the driving substrate 100 in the second direction Y, and a fourth dimension H4 at one end away from the driving substrate 100 in the second direction Y. The second defining structure 213 has a fifth dimension H5 at one end near the driving substrate 100 in the second direction Y. The third dimension H3 is greater than the fourth dimension H4, and the fifth dimension H5 is greater than the fourth dimension H4. The second direction Y is the direction of the line connecting adjacent pixel openings 211.

[0123] In some examples, reference Figure 6 The first defining structure 212 has a first dimension H1 in the first direction X, the second defining structure 213 has a second dimension H2 in the first direction X, the end of the first defining structure 212 near the driving substrate 100 has a third dimension H3 in the second direction Y, the end of the first defining structure 212 away from the driving substrate 100 has a fourth dimension H4 in the second direction Y, and the end of the second defining structure 213 near the driving substrate 100 has a fifth dimension H5 in the second direction Y. The first dimension H1 is larger than the second dimension H2, the third dimension H3 is larger than the fourth dimension H4, and the fifth dimension H5 is larger than the fourth dimension H4. The first direction X is perpendicular to the plane where the driving substrate 100 is located, and the second direction Y is the direction of the line connecting adjacent pixel openings 211.

[0124] For example, refer to Figure 6 The sidewalls of the first defining structure 212 can form a step, and the maximum width of the second defining structure 213 is greater than the maximum width of the end of the first defining layer away from the driving substrate 100. Thus, the first defining structure 212 can limit the thickness of the film layer disposed between the sidewalls of the first defining structure 212 along the first direction X, so that the size of the light-emitting device layer 200 in the first direction X is smaller than the size of the first defining structure 212 in the first direction X.

[0125] In some examples, reference Figure 6 The second light-emitting layer 230 is connected to the first defining structure 212. The distance between the end of the second light-emitting layer 230 away from the driving substrate 100 and the driving substrate 100 is the second distance D2. The distance between the end of the first defining structure 212 away from the driving substrate 100 and the driving substrate 100 is the fifth distance D5. The second distance D2 is less than the fifth distance D5.

[0126] In some examples, the second distance can be equal to the fifth distance.

[0127] For example, refer to Figure 6 When the pixel defining layer 210 forms an Undercut structure, since the second defining structure 213 restricts the height of the second light-emitting layer 230, the second distance D2 of the second light-emitting layer 230 is less than the fifth distance D5, and the second distance D2 of the second light-emitting layer 230 can be less than or equal to the dimension of the first defining structure 212 along the first direction X, that is, the fourth dimension H4.

[0128] For example, refer to Figure 6 The pixel defining layer 210 is connected to the driving substrate 100, and the aforementioned fifth distance D5 can be equivalent to the first dimension H1.

[0129] In some examples, the ratio of the fifth distance to the second distance is greater than or equal to 2.

[0130] For example, refer to Figure 6 Other films can be formed at the end of the second light-emitting layer 230 away from the driving substrate 100, and the space corresponding to the difference between the second distance D2 and the fifth distance D5 can be used to form other films.

[0131] In some examples, reference Figure 6 A second electrode 270 is disposed on the side of the light-emitting layer away from the driving substrate 100. The second electrodes 270 corresponding to adjacent pixel openings 211 are disconnected, for example, two adjacent second electrodes 270 in the second direction Y are disconnected. In some examples, two adjacent second electrodes 270 in the plane of the driving substrate 100 can be connected in the direction perpendicular to the second direction Y.

[0132] In some examples, reference Figure 6 The distance between the side of the second electrode 270 away from the driving substrate 100 and the driving substrate 100 is the sixth distance D6, which is less than the fifth distance D5.

[0133] For example, with the plane where the driving substrate is located as the reference plane, the height of the second electrode can be less than or equal to the height of the first defining structure, thereby protecting the second electrode and other film layers through the pixel defining layer.

[0134] Figure 7 This is a schematic partial structural diagram of another display panel provided in an embodiment of this application. In some examples, reference is made to... Figure 7 The display panel 400 includes a dielectric layer 280, which is disposed between the second light-emitting layer 230 and the pixel defining layer 210. The dielectric layer 280 is connected to the second light-emitting layer 230. The refractive index of the dielectric layer 280 is less than that of the second light-emitting layer 230, and the refractive index of the dielectric layer 280 is greater than that of air.

[0135] In some examples, the distance between the side of the pixel defining layer away from the driving substrate and the driving substrate is a first distance, and the distance between the end of the dielectric layer away from the driving substrate and the driving substrate is a seventh distance, the seventh distance being greater than or equal to the first distance.

[0136] For example, refer to Figure 7 The dielectric layer 280 allows light to undergo total internal reflection at the wall surface where the dielectric layer 280 and the second light-emitting layer 230 are connected, thereby increasing the amount of light emitted into the air through the second light-emitting layer 230.

[0137] Figure 8 for Figure 7A magnified view of the structure at point A in the diagram. In some examples, refer to... Figure 8 The thickness of the dielectric layer 280 in the third direction Z is λ / 4, where λ is the wavelength of the first light ray L1 emitted from the first light-emitting layer 220, and the third direction Z is the direction perpendicular to the sidewall of the pixel opening 211. The dielectric layer 280 can adjust the light emitted from the second light-emitting layer 230, and the light can undergo total internal reflection at the wall between the dielectric layer 280 and the second light-emitting layer 230, thereby preventing light loss caused by light shining into the pixel defining layer 210.

[0138] For example, refer to Figure 8 The sidewalls of the dielectric layer 280 and the second light-emitting layer 230 have an angle with the first direction X, so the dielectric layer 280 and the second light-emitting layer 230 have a slope to form a step structure, so the third direction Z also has an angle with the second direction Y.

[0139] Figure 9 This is a schematic partial structural diagram of another display panel provided in an embodiment of this application. For example, refer to... Figure 9 The dielectric layer 280 can also be disposed between the first defining structure 212 and the second light-emitting layer 230.

[0140] Figure 10 This is a schematic partial structural diagram of another display panel provided in an embodiment of this application. In some examples, reference is made to... Figure 10 The display panel 400 also includes a light filter 310, which is disposed on the side of the light-emitting device layer 200 away from the driving substrate 100. The light filter 310 includes a light-shielding structure 311 and a light-filtering layer 312. The light-shielding structure 311 includes a plurality of cutouts 311-1. The light-filtering layer 312 is disposed in the cutouts 311-1. The orthographic projection of the cutouts 311-1 on the driving substrate 100 covers the orthographic projection of the pixel opening 211 on the driving substrate 100. The orthographic projection of the light-shielding structure 311 on the driving substrate 100 falls within the orthographic projection of the pixel defining layer 210 on the driving substrate 100.

[0141] In some examples, reference Figure 10 The orthographic projections of the first light-emitting layer 220 and the second light-emitting layer 230 on the driving substrate 100 both fall within the orthographic projection of the cutout 311-1 on the driving substrate 100. The light emitted from the first light-emitting layer 220 and the second light-emitting layer 230 can be filtered by the filter 310 to improve the color purity of the emitted light.

[0142] For example, refer to Figure 10 The filter layer 312 can be set to correspond to the pixel opening 211, and the light emitted from the first light-emitting layer 220 and the light emitted from the second light-emitting layer 230 can be filtered by the filter layer 312. The light-shielding structure 311 can be set to correspond to the pixel defining layer 210.

[0143] The second aspect of this application, Figure 11 A schematic partial structural diagram of a display device provided in an embodiment of this application. (Reference) Figure 11 A display device is provided, the display device 500 including the display panel 400 in any of the above technical solutions.

[0144] The display devices provided in this application embodiment may include televisions, computers, smartphones, smart wearable devices, laptops, and tablets, etc. Smart wearable devices may include smartwatches, AR (augmented reality) devices, and VR (virtual reality) devices, etc.

[0145] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0146] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0147] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0148] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A display panel, characterized by, The display panel comprises: a driving substrate and a light-emitting device layer, the light-emitting device layer being arranged on one side of the driving substrate; the light-emitting device layer comprises a pixel defining layer, a first light-emitting layer and a second light-emitting layer, the pixel defining layer is provided with a plurality of pixel openings, the first light-emitting layer is arranged in the pixel openings, and the second light-emitting layer is arranged on the inner wall of the pixel openings, the second light-emitting layer being arranged between the pixel defining layer and the first light-emitting layer, and the first light-emitting layers corresponding to two adjacent pixel openings are disconnected; the second light-emitting layer is used for emitting second light under the action of first light, wherein the first light is the light emitted by the first light-emitting layer, and the first light and the second light are of the same color.

2. The display panel of claim 1, wherein, The orthographic projection of the pixel defining layer on the driving substrate surrounds the orthographic projection of the first light-emitting layer on the driving substrate.

3. The display panel of claim 1, wherein, The distance between the side of the pixel defining layer away from the driving substrate and the driving substrate is a first distance, and the distance between the side of the second light-emitting layer away from the driving substrate and the driving substrate is a second distance; The first distance is greater than or equal to the second distance.

4. The display panel of claim 1, wherein, The size of the second light-emitting layer in a first direction is greater than the size of the first light-emitting layer in the first direction; The first direction is a direction perpendicular to the plane in which the driving substrate is located.

5. The display panel of claim 1, wherein: the distance between the end of the second light-emitting layer close to the driving substrate and the driving substrate is a third distance, and the distance between the side of the first light-emitting layer close to the driving substrate and the driving substrate is a fourth distance; The third distance is less than or equal to the fourth distance.

6. The display panel of any one of claims 1-5, wherein, The second light-emitting layer comprises quantum dot material; and / or, The first light-emitting layer comprises quantum dot material; and / or, The pixel defining layer comprises light-blocking material and / or light-absorbing material.

7. The display panel of any one of claims 1-5, wherein, The light-emitting device layer comprises a first electrode, a hole transport layer, an electron transport layer and a second electrode; The hole transport layer is located between the first electrode and the first light-emitting layer, and the electron transport layer is located between the first light-emitting layer and the second electrode; Part of the electron transport layer and part of the hole transport layer are arranged on the inner wall of the pixel opening, the second light-emitting layer is located between the pixel defining layer and the hole transport layer, and part of the hole transport layer is located between the second light-emitting layer and the electron transport layer.

8. The display panel of claim 7, wherein, The hole transport layers corresponding to adjacent pixel openings are connected to each other; and / or, The electron transport layers corresponding to adjacent pixel openings are connected to each other; and / or, The second electrodes corresponding to adjacent pixel openings are connected to each other.

9. The display panel of claim 1, wherein, The pixel defining layer comprises a first defining structure and a second defining structure, the second defining structure being arranged on the side of the first defining structure away from the driving substrate, and the second defining structure being connected to the end of the first defining structure away from the driving substrate. A first projection of the first defining structure on the driving substrate is a first projection, and a second projection of the second defining structure on the driving substrate is a second projection, and the first projection is within the second projection.

10. The display panel of claim 9, wherein, A first dimension of the first defining structure in a first direction is a first dimension, a second dimension of the second defining structure in the first direction is a second dimension, the first dimension is greater than the second dimension, and the first direction is a direction perpendicular to a plane on which the driving substrate is located. And / or, A third dimension of the first defining structure in a second direction is a third dimension, a fourth dimension of the first defining structure in the second direction is a fourth dimension, and a fifth dimension of the second defining structure in the second direction is a fifth dimension, the third dimension is greater than the fourth dimension, the fifth dimension is greater than the fourth dimension, and the second direction is a direction of a line connecting adjacent pixel openings.

11. The display panel of claim 9, wherein, The second light-emitting layer is connected to the first defining structure. A distance between an end of the second light-emitting layer away from the driving substrate and the driving substrate is a second distance, and a distance between an end of the first defining structure away from the driving substrate and the driving substrate is a fifth distance, and the second distance is less than or equal to the fifth distance.

12. The display panel of claim 11, wherein, A ratio of the fifth distance to the second distance is greater than or equal to 2.

13. The display panel of claim 11, wherein, A second electrode is arranged on a side of the light-emitting layer away from the driving substrate, and the second electrodes corresponding to adjacent pixel openings are disconnected. A distance between a side of the second electrode away from the driving substrate and the driving substrate is a sixth distance, and the sixth distance is less than the fifth distance.

14. The display panel of claim 1 or 9, wherein, A medium layer is further included, and the medium layer is arranged between the second light-emitting layer and the pixel defining layer, the medium layer is connected to the second light-emitting layer, a refractive index of the medium layer is less than a refractive index of the second light-emitting layer, and the refractive index of the medium layer is greater than a refractive index of air. A distance between a side of the pixel defining layer away from the driving substrate and the driving substrate is a first distance, and a distance between an end of the medium layer away from the driving substrate and the driving substrate is a seventh distance, and the seventh distance is greater than or equal to the first distance.

15. The display panel of claim 14, wherein, A thickness of the medium layer in a third direction is λ / 4, λ is a wavelength of the first light emitted by the first light-emitting layer, and the third direction is a direction perpendicular to a side wall of the pixel opening.

16. The display panel of claim 1, wherein, An optical filter is arranged on a side of the light-emitting device layer away from the driving substrate. The optical filter includes a light-shielding structure and a filter layer, the light-shielding structure includes a plurality of hollows, the filter layer is arranged in the hollows, a first projection of the hollows on the driving substrate covers a second projection of the pixel opening on the driving substrate, and a third projection of the light-shielding structure on the driving substrate is within a fourth projection of the pixel defining layer on the driving substrate. The first light-emitting layer and the second light-emitting layer each have a normal projection on the driving substrate that falls within the normal projection of the hollowing on the driving substrate.

17. A display device comprising: The display panel as claimed in any one of claims 1 to 16.

Images