Display panel and display apparatus
Patent Information
- Application Number
- PCT/CN2025/084949
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-10-01
Smart Images
Figure CN2025084949_01102026_PF_FP_ABST
Abstract
Description
Display panel and display device Technical Field
[0001] This disclosure relates to a display panel and a display device. Background Technology
[0002] As mobile electronic products become more feature-rich, with increased integrated circuit (IC) core counts, CPU / GPU capabilities, camera counts, and auxiliary functions (such as satellite phones and navigation modules), their power consumption has also increased significantly. To improve battery life, it is necessary to continuously reduce power consumption during screen display. Compared to using polarizers, color filter on encapsulation (COE) technology offers higher transmittance (polarizers typically have transmittance below 50%), thus enabling screens using COE to achieve better power efficiency. Summary of the Invention
[0003] At least one embodiment of this disclosure provides a display substrate, including a substrate, a plurality of sub-pixels, a pixel defining layer, a color filter layer, and a light-shielding layer. The plurality of sub-pixels are located on the substrate, and each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on opposite sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. At least a portion of the pixel defining layer is located between the light-emitting functional layer and the first electrode. The pixel defining layer includes a plurality of pixel openings and pixel defining portions located between adjacent pixel openings. Each pixel opening exposes at least a portion of the first electrode. The color filter layer is located on the side of the plurality of sub-pixels away from the substrate, and the color filter layer includes a plurality of color filter structures. At least a portion of the light-shielding layer is located between the color filter layer and the pixel defining layer. Between the fixed layers, the light-shielding layer includes a plurality of first openings, each first opening exposing at least a portion of the color filter structure; wherein, the first electrode of each sub-pixel includes a main body portion and a peripheral portion connected to each other, the main body portion being exposed by the pixel opening, the peripheral portion being located between the pixel defining portion and the substrate, each color filter structure including a first portion and a second portion, the orthographic projection of the first portion on the substrate at least partially overlapping the orthographic projection of the main body portion of the first electrode on the substrate, the orthographic projection of the second portion on the substrate at least partially overlapping the orthographic projection of the peripheral portion of the first electrode on the substrate, the plurality of color filter structures including at least one first color filter structure, the color of the first color filter structure being a first color, and the pixel defining layer being configured to transmit light of the first color with a transmittance of at least 10%.
[0004] For example, in a display panel provided according to at least one embodiment of the present disclosure, the pixel defining layer is further configured to reflect at least a portion of the light from the first color filter structure.
[0005] For example, a display panel provided according to at least one embodiment of the present disclosure further includes at least one support structure located on the side of the pixel defining portion away from the substrate, the support structure and the pixel defining portion being configured to be formed using the same film layer through a halftone mask.
[0006] For example, in a display panel provided according to at least one embodiment of the present disclosure, at least a portion of the side edges of the cross section of the support structure cut by a plane have a first slope angle, and at least a portion of the side edges of the cross section of the pixel defining portion cut by the plane have a second slope angle, the first slope angle being smaller than the second slope angle, the plane being perpendicular to the substrate and parallel to the arrangement direction of adjacent sub-pixels located on both sides of the pixel defining portion.
[0007] For example, in a display panel provided according to at least one embodiment of the present disclosure, the first slope angle is 3 to 50 degrees and the second slope angle is 20 to 60 degrees.
[0008] For example, in a display panel provided according to at least one embodiment of the present disclosure, the first slope angle is less than 10 degrees.
[0009] For example, in a display panel provided according to at least one embodiment of the present disclosure, the size of the support structure is 0.5 to 2.0 micrometers in a direction perpendicular to the substrate, and the size of the pixel defining portion is 1.0 to 1.7 micrometers.
[0010] For example, in a display panel provided according to at least one embodiment of the present disclosure, the sum of the dimensions of the support structure and the pixel defining portion in a direction perpendicular to the substrate is not less than 2 micrometers.
[0011] For example, in a display panel provided according to at least one embodiment of the present disclosure, the pixel defining layer includes at least one of black pigment, blue pigment, purple pigment, red pigment, orange pigment, and yellow pigment.
[0012] For example, in a display panel provided according to at least one embodiment of the present disclosure, the pixel defining portion includes a side surface surrounding the pixel opening of the sub-pixel, the orthographic projection of the side surface on the substrate falling into the orthographic projection of the peripheral portion of the first electrode of the sub-pixel on the substrate.
[0013] For example, in a display panel provided according to at least one embodiment of the present disclosure, the portion of the first color filter structure exposed by the first opening has a first orthographic projection on the substrate, and a first electrode overlapping the first color filter structure in a direction perpendicular to the substrate has a second orthographic projection on the substrate, wherein the first orthographic projection falls into the second orthographic projection.
[0014] For example, in a display panel provided according to at least one embodiment of the present disclosure, the second orthographic projection includes a portion located outside the first orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is not less than 0.3 micrometers.
[0015] For example, a display panel provided according to at least one embodiment of the present disclosure further includes a planarization layer located between the pixel defining layer and the substrate and in contact with the pixel defining layer, wherein the planarization layer has an absorption rate of not less than 90% for light from the first color filter structure.
[0016] For example, in a display panel provided according to at least one embodiment of the present disclosure, the planarization layer is further configured to reflect at least a portion of the light from the first color filter structure.
[0017] For example, in a display panel provided according to at least one embodiment of the present disclosure, the plurality of color filter structures further includes at least one second color filter structure, the second color filter structure being a second color and the second color being different from the first color, wherein the pixel defining layer and the planarization layer both have an absorption rate of not less than 90% for light from the second color filter structure.
[0018] For example, in a display panel provided according to at least one embodiment of the present disclosure, the color of the planarization layer is the same as the color of the pixel defining layer, and both are different from the color of the second color filter structure.
[0019] For example, in a display panel provided according to at least one embodiment of the present disclosure, the color of the planarization layer is different from the color of the pixel defining layer, and both are different from the color of the second color filter structure.
[0020] For example, in a display panel provided according to at least one embodiment of the present disclosure, the color of the planarization layer is different from the color of the pixel defining layer, and the color of the first color filter structure is the same as the color of the pixel defining layer.
[0021] For example, in a display panel provided according to at least one embodiment of the present disclosure, the pixel defining layer further includes at least one recess, the thickness of the pixel defining layer at the recess is less than the average thickness of the pixel defining layer, and the recess is formed during the fabrication of the pixel defining layer using a halftone mask.
[0022] For example, in a display panel provided according to at least one embodiment of the present disclosure, the light-shielding layer further includes at least one second opening, the orthographic projection of the second opening on the substrate at least partially overlapping the orthographic projection of the recess on the substrate.
[0023] For example, in a display panel provided according to at least one embodiment of the present disclosure, the light-shielding layer has a transmittance of not less than 60% for infrared light.
[0024] For example, in a display panel provided according to at least one embodiment of the present disclosure, the pixel defining portion includes a side surface surrounding the pixel opening, the side surface including a first sub-side surface, a connecting surface, and a second sub-side surface, the first sub-side surface being connected to the second sub-side surface via the connecting surface, the first sub-side surface and the second sub-side surface both extending in a direction away from the main body portion of the first electrode overlapping the pixel opening, at least a portion of the first sub-side surface having a first sub-slope angle between itself and a plane parallel to the substrate, at least a portion of the connecting surface being parallel to the substrate, and at least a portion of the second sub-side surface having a second sub-slope angle between itself and a plane parallel to the substrate.
[0025] For example, in a display panel provided according to at least one embodiment of the present disclosure, both the first sub-slope angle and the second sub-slope angle are 20 to 50 degrees.
[0026] At least one embodiment of this disclosure also provides a display device, which includes the display panel described in any embodiment of this disclosure. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.
[0028] Figure 1 is a partial cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure.
[0029] Figure 2 is a partial cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure.
[0030] Figures 3A and 3B are schematic diagrams of the transmittance distribution of pixel-defined layers of different colors.
[0031] Figure 4 is a schematic diagram of the support structure and pixel definition formed by using a halftone mask.
[0032] Figure 5 is a schematic diagram of the spectral luminous efficiency distribution in the wavelength range of 380–780 nm.
[0033] Figure 6 is a schematic diagram of a partial structure of a display panel.
[0034] Figure 7 is another partial cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure.
[0035] Figure 8 is a partial structural schematic diagram of another display panel provided in at least one embodiment of the present disclosure.
[0036] Figure 9 is a schematic diagram of another display panel provided in at least one embodiment of the present disclosure.
[0037] Figure 10 is a partial structural schematic diagram of another display panel provided in at least one embodiment of the present disclosure.
[0038] Figure 11 is a schematic block diagram of a display device provided according to another embodiment of the present disclosure. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.
[0040] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.
[0041] The features such as "parallel," "perpendicular," and "identical" used in the embodiments of this disclosure include features in the strict sense of "parallel," "perpendicular," and "identical," as well as cases where "approximately parallel," "approximately perpendicular," and "approximately identical" include certain errors, taking into account measurement and errors associated with the measurement of a specific quantity (e.g., limitations of the measurement system), and represent the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of said value. Unless otherwise specified in the following embodiments of this disclosure, the quantity of a component is implied to mean that the component may be one or more, or can be understood as at least one. "At least one" means one or more, and "more" means at least two. The term "integrated structure" used in the embodiments of this disclosure refers to two or more components formed using the same material in the same patterning process.
[0042] Pol-less technology, also known as COE (Color filter on encapsulation) technology, is applied to displays with organic light-emitting diodes (OLEDs). This technology mainly uses a filter on the encapsulation layer to replace the traditional polarizer, thereby improving the light transmittance of the display and reducing power consumption.
[0043] In some display panels, the pixel-defining layer used to define the light-emitting area of sub-pixels is primarily black to act as a light-absorbing layer, reducing reflectivity and optimizing color separation. However, in some cases, due to deviations in process dimensions (e.g., differences in pixel aperture ratio) or changes in design requirements, such as when the display panel needs to achieve a more bluish hue or a more reddish hue, the overall hue of the display panel needs to be adjusted to achieve accurate and good color gradation, thereby optimizing the display effect.
[0044] At least one embodiment of this disclosure provides a display panel, including a substrate and a plurality of sub-pixels located on the substrate. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on opposite sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. At least a portion of a pixel defining layer is located between the light-emitting functional layer and the first electrode. The pixel defining layer includes a plurality of pixel openings and pixel defining portions located between adjacent pixel openings. Each pixel opening exposes at least a portion of the first electrode. A color filter layer is located on the side of the plurality of sub-pixels away from the substrate. The color filter layer includes a plurality of color filter structures. At least a portion of a light-shielding layer is located between the color filter layer and the pixel defining layer, blocking light. The layer includes a plurality of first openings, each first opening exposing at least a portion of the color filter structure; the first electrode of each sub-pixel includes a main body portion and a peripheral portion connected to each other, the main body portion being exposed by the pixel opening, and the peripheral portion being located between the pixel defining portion and the substrate; each color filter structure includes a first portion and a second portion, the orthographic projection of the first portion on the substrate at least partially overlapping the orthographic projection of the main body portion of the first electrode on the substrate, the orthographic projection of the second portion on the substrate at least partially overlapping the orthographic projection of the peripheral portion of the first electrode on the substrate; the plurality of color filter structures include at least one first color filter structure, the color of the first color filter structure being a first color, and the pixel defining layer being configured to transmit light of the first color with a transmittance of at least 10%.
[0045] In at least one embodiment of the present disclosure, the pixel defining layer of the display panel has a transmittance of at least 10% for light of the first color. Thus, at least a portion of the light (e.g., light of the first color) from the first color filter structure can pass through the pixel defining layer and reach the periphery of the first electrode of the sub-pixel, and be reflected on the surface of the periphery of the sub-pixel. The reflected light passes through the pixel defining portion and exits through the first color filter structure. As a result, more light of the first color can exit from the first color filter structure, so that the display panel can have a hue that is more biased towards the first color, thereby making the display panel have a better and more satisfactory color gradation to optimize the display effect.
[0046] The display panel and display device provided in the embodiments of this disclosure are described below with reference to the accompanying drawings.
[0047] Figure 1 is a partial cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure.
[0048] As shown in Figure 1, the display panel includes a substrate 01 and a plurality of sub-pixels 10 located on the substrate 01. Each sub-pixel 10 includes a light-emitting functional layer 130 and a first electrode 110 and a second electrode 120 located on both sides of the light-emitting functional layer 130 in a direction perpendicular to the substrate 01. The first electrode 110 is located between the light-emitting functional layer 130 and the substrate 01.
[0049] As shown in Figure 1, the display panel further includes a pixel defining layer 200, a color filter layer 300, and a light-shielding layer 400. At least a portion of the pixel defining layer 200 is located between the light-emitting functional layer 130 and the first electrode 110. The pixel defining layer 200 includes a plurality of pixel openings 210 and pixel defining portions 230 located between adjacent pixel openings 210. Each pixel opening 210 exposes at least a portion of the first electrode 110 to define the light-emitting area of the sub-pixel 10.
[0050] As shown in Figure 1, the light-emitting functional layer 130 is disposed in contact with the first electrode 110 through the pixel opening 210. For example, the first electrode 110 and the second electrode 120 located on both sides of the light-emitting functional layer 130 can drive the light-emitting functional layer 130 located between them to emit light. For example, the light-emitting area of the sub-pixel 10 refers to the area of the sub-pixel 10 that effectively emits light, and the shape of the light-emitting area refers to a two-dimensional shape. For example, the shape of the light-emitting area can be the same as the shape of the orthographic projection of the portion of the first electrode 110 exposed by the pixel opening 210 onto the substrate 01.
[0051] For example, as shown in FIG1, the light-emitting functional layer 130 may include multiple film layers, such as a light-emitting layer for emitting light and a charge-generating layer. For example, the light-emitting functional layer 130 may be a film layer in an organic light-emitting element. For example, the light-emitting functional layer 130 may include a first light-emitting layer, a charge-generating layer, and a second light-emitting layer stacked together, with the charge-generating layer located between the first light-emitting layer and the second light-emitting layer. For example, in the same sub-pixel 10, the first light-emitting layer and the second light-emitting layer may be light-emitting layers that emit the same color of light. For example, the first light-emitting layer in a sub-pixel 10 that emits different colors of light emits different colors of light. For example, the second light-emitting layer in a sub-pixel 10 that emits different colors of light emits different colors of light.
[0052] For example, as shown in Figure 1, the light-emitting functional layer may further include a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. For instance, the aforementioned hole injection layer, hole transport layer, electron transport layer, electron injection layer, and charge generation layer are all shared film layers for multiple sub-pixels, and can be referred to as common layers. For instance, the aforementioned common layer and the second electrode can be film layers formed using an open mask. For instance, the first light-emitting layer and the second light-emitting layer can be film layers formed using a fine metal mask (FMM), and a gap can be set between the light-emitting layers of different sub-pixels.
[0053] For example, as shown in Figure 1, the charge generation layer has strong conductivity, which enables the light-emitting functional layer 130 to have advantages such as long lifetime, low power consumption, and high brightness. For example, the charge generation layer may include an N-type charge generation layer and a P-type charge generation layer. For example, the material of the charge generation layer may be a material containing phosphorothoxy groups or a triazine material. For example, the ratio of the electron mobility of the material in the charge generation layer to the electron mobility of the material in the electron transport layer is 10. -2 ~10 2 .
[0054] For example, as shown in Figure 1, the first electrode 110 can be an anode, and the second electrode 120 can be a cathode. For example, the display panel also includes a film layer 02, located between the first electrode 110 of the sub-pixel 10 and the substrate 01. For example, the sub-pixel also includes a pixel circuit (not shown in the figure), and the first electrode of the sub-pixel can be electrically connected to the pixel circuit through a via. For example, the film layer 02 may also include other structures, such as a passivation layer, a buffer layer, a gate insulating layer, an interlayer insulating layer, etc., which are not limited in the embodiments of this disclosure.
[0055] As shown in Figure 1, the color filter layer 300 is located on the side of the plurality of sub-pixels 10 away from the substrate 01, and the color filter layer 300 includes a plurality of color filter structures 310. For example, the plurality of color filter structures 310 includes a first color filter structure 311 having a first color, and other color filter structures having a different first color. For example, the color of the light emitted by the light-emitting functional layer of the sub-pixel can be the same as the color of the color filter structure facing the sub-pixel, thereby enhancing the color through the color filter structure.
[0056] As shown in Figure 1, at least a portion of the light-shielding layer 400 is located between the color filter layer 300 and the pixel defining layer 200. The light-shielding layer 400 includes a plurality of first openings 410, each first opening 410 exposing at least a portion of the color filter structure 310. For example, a film layer 03 is also provided between the light-shielding layer 400 and the second electrode 120 of the sub-pixel 10, and the film layer 03 includes a plurality of sub-film layers. For example, the film layer 03 may include a touch layer, but is not limited thereto, and the embodiments of this disclosure are not limited thereto.
[0057] As shown in FIG1, the first electrode 110 of each sub-pixel 10 includes a main body portion 111 and a peripheral portion 112 connected to each other. The main body portion 111 is exposed by the pixel opening 210, and the peripheral portion 112 is located between the pixel defining portion 230 and the substrate 01. For example, the main body portion 111 of the first electrode 110 of the sub-pixel 10 is located within the light-emitting area, and the peripheral portion 112 is located outside the light-emitting area. For example, the peripheral portion 112 of the first electrode 110 of the sub-pixel 10 surrounds the main body portion 111.
[0058] As shown in FIG1, each color filter structure 310 (e.g., the portion located in the first opening 410) includes a first portion 301 and a second portion 302. The orthographic projection of the first portion 301 on the substrate 01 at least partially overlaps with the orthographic projection of the main body portion 111 of the first electrode 110 on the substrate 01, and the orthographic projection of the second portion 302 on the substrate 01 at least partially overlaps with the orthographic projection of the peripheral portion 112 of the first electrode 110 on the substrate 01. For example, the orthographic projection of the first portion 301 of the color filter structure 310 on the substrate 01 substantially overlaps with the orthographic projection of the main body portion 111 of the first electrode 110 of the sub-pixel 10 on the substrate 01. For example, the orthographic projection of the first portion 301 of the color filter structure 310 on the substrate 01 falls within the orthographic projection of the light-emitting area of the sub-pixel 10 on the substrate 01. For example, the orthographic projection of the second portion 302 of the color filter structure 310 onto the substrate 01 falls into the orthographic projection of the peripheral portion 112 of the first electrode 110 of the sub-pixel 10 onto the substrate 01.
[0059] As shown in Figure 1, the color of the first color filter structure 311 is a first color, and the pixel defining layer 200 is configured to transmit light of the first color with a transmittance of at least 10%. For example, light from outside the display panel can be transmitted from the second portion 302 of the first color filter structure 311 to the pixel defining portion 230, and then transmitted from the pixel defining portion 230 to the surface of the first electrode 110 of the sub-pixel 10 away from the substrate 01 with a transmittance of at least 10%, and then reflected from the surface of the first electrode 110, and finally transmitted from the pixel defining portion 230 to the first color filter structure 311, and then emitted after transmission from the first color filter structure 311.
[0060] As described above, the pixel-defining layer has a transmittance of at least 10% for light of the first color. At least a portion of the light from the first color filter structure (e.g., light of the first color) is emitted from the first color filter structure after passing through the aforementioned optical path. In this way, more light of the first color can be emitted from the first color filter structure, thereby allowing the display panel to have a hue that is more biased towards the first color, and thus enabling the display panel to have a better and more compliant color gradation to optimize the display effect.
[0061] In some embodiments, as shown in FIG1, the pixel defining layer 200 is further configured to reflect at least a portion of the light from the first color filter structure 311. For example, the light from the first color filter structure 311 may be light transmitted from the first color filter structure 311 after passing through the display panel, such as light of a first color, and at least a portion of this light can be reflected on the surface of the pixel defining layer 200, i.e., at least a portion is not absorbed by or transmitted through the pixel defining layer 200. For example, the color of the pixel defining layer 200 may be non-black, such as red or blue, but is not limited thereto.
[0062] This configuration helps to ensure the transmittance of the pixel-limiting layer to the first color light, thereby allowing more light of the first color to be emitted from the first color filter structure, thus adjusting the hue of the display panel to be more biased towards the first color.
[0063] In some embodiments, as shown in FIG1, the pixel defining layer 200 and the first color filter structure 311 may have the same color, for example, both may have the same color as the light-emitting functional layer 130 of the corresponding sub-pixel 10, thereby enabling the pixel defining layer 200 to have a large transmittance for the first color light. For example, the sub-pixel corresponding to the first color filter structure refers to a sub-pixel having a first electrode that overlaps with the first color filter structure in a direction perpendicular to the substrate.
[0064] In some embodiments, as shown in FIG1, the light-emitting functional layer 130 can be configured to emit blue light, and both the pixel limiting layer 200 and the first color filter structure 311 are blue. This allows the first portion 301 of the first color filter structure 311 to emit blue light emitted from the light-emitting functional layer 130, and the second portion 302 of the first color filter structure 311 to emit blue light reflected from the peripheral portion 112 of the first electrode 110. This allows more light of the first color to be emitted from the first color filter structure 311. For example, the blue light emitted from the second portion 302 of the first color filter structure 311 can be used to adjust the hue of the display panel, making the hue of the display panel more biased towards the first color (such as blue). For example, the pixel limiting layer can also be configured to emit red light, yellow light, etc., specifically set according to the hue adjustment requirements of the display panel. The embodiments of this disclosure do not limit this.
[0065] In some embodiments, as shown in FIG1, the pixel defining layer 200 and the first color filter structure 311 may be different colors, as long as the pixel defining layer 200 has a transmittance of at least 10% for light of the first color. For example, the first color filter structure 311 may be red or blue, the pixel defining layer 200 may be purple, and the pixel defining layer 200 has a transmittance of at least 10% for both red and blue light, thereby adjusting the hue of the display panel to be biased towards blue or red. For example, the color filter layer 300 may include a blue first color filter structure 311, and may also include a red color filter structure. When the pixel defining layer 200 is purple, the emitted colors of both the blue and red sub-pixels in the display panel can be enhanced, thereby allowing the hue of the entire display panel to shift synchronously towards the red and blue directions.
[0066] Table 1 shows the dark state simulation results when using pixel-limited layers of different colors.
[0067] As shown in Table 1, a* and b* represent the position of the color in space. A positive a* value represents red, a positive b* value represents yellow, and a negative b* value represents blue. When a blue pixel-limiting layer is used, the dark hue difference value shifts significantly towards blue, i.e., b* is -0.343. When a red pixel-limiting layer is used, the dark hue difference value shifts significantly towards red, i.e., a* is 0.416. When a purple pixel-limiting layer is used, the dark hue difference value shifts significantly towards both red and blue, i.e., a* is 0.416 and b* is -0.056. Therefore, in practical design, if a more bluish hue is required for the display panel, a blue or purple pixel-limiting layer can be used. If a more reddish hue is required for the display panel, a red or purple pixel-limiting layer can be used.
[0068] Table 1
[0069] Figure 2 is a partial cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure; Figures 3A and 3B are schematic diagrams of the transmittance distribution of pixel limiting layers of different colors; Figure 4 is a schematic diagram of a support structure and pixel limiting portion formed using a halftone mask.
[0070] In some embodiments, as shown in Figures 1 and 2, the display panel further includes at least one support structure 500 located on the side of the pixel defining portion 230 away from the substrate 01, and the support structure 500 and the pixel defining portion 230 are configured to be formed using the same film layer through a halftone mask. The support structure 500 is not shown in Figure 1, and Figure 2 schematically illustrates the positional relationship between the support structure 500 and the pixel defining portion 230. Furthermore, the support structure 500 can also be seen in Figure 9.
[0071] In some embodiments, as shown in FIG3A, the red, blue, and purple pixel-defining portions all exhibit high transmittance, i.e., not less than 10%, in the G-band (i.e., the blue light band with a wavelength of 436 nm) and the H-band (i.e., the violet light band with a wavelength of 405 nm). However, as shown in FIG3B, when the pixel-defining portion is black, its absorption rate is high in the G-band, H-band, and I-band (i.e., the near-violet light band with a wavelength of 365 nm), and its transmittance is less than 1%. This makes it difficult to fabricate the pixel-defining portion and the support structure using the same exposure process. The support structure needs to be fabricated using a separate mask, thus making the fabrication process more complex.
[0072] In some embodiments, as shown in Figures 2 and 4, the support structure 500 may be formed together with the pixel defining portion 230 using the same material (such as positive adhesive) and a halftone mask. For example, the halftone mask in Figure 4 includes a non-transparent area S1 and a partially transparent area S2. For example, the portion of the pixel defining material 2000 corresponding to the non-transparent area S1 is used to form the support structure 500 and a portion of the pixel defining portion 230 located on the side of the support structure 500 near the first electrode 110, and the portion of the pixel defining material 2000 corresponding to the partially transparent area S2 is used to form another portion of the pixel defining portion 230. For example, the support structure 500 may be used to support the mask (e.g., a mask for forming a light-emitting functional layer) to reduce the abrasion of the light-emitting material by the mask.
[0073] In some embodiments, the support structure and pixel defining portion may also use negative adhesive, and the embodiments of this disclosure are not limited to this.
[0074] By making the pixel-defining layer a color other than black, such as blue, red, purple, or green, the pixel-defining layer can have a higher transmittance. This allows it to be formed in the same exposure process as the support structure, thereby saving the number of masks and simplifying the process flow.
[0075] In some embodiments, as shown in FIG2, in a direction perpendicular to the substrate, such as in direction Z, the size L1 of the support structure 500 is 0.5 to 2.0 micrometers, the size L2 of the pixel defining portion 230 is 1.0 to 1.7 micrometers, and the sum of the sizes of the support structure 500 and the pixel defining portion 230, L3, is 1.5 to 3.7 micrometers. For example, the size L1 of the support structure 500 can be 0.5 to 1.0 micrometers, 0.8 to 1.1 micrometers, 1.0 to 1.5 micrometers, or 1.5 to 2.0 micrometers; the embodiments of this disclosure do not limit this. For example, the size L2 of the pixel defining portion 230 can be 1.0 to 1.5 micrometers, 1.1 to 1.4 micrometers, 1.2 to 1.6 micrometers, or 1.3 to 1.7 micrometers; the embodiments of this disclosure do not limit this.
[0076] On the one hand, in the Z direction, by making the size L1 of the support structure 0.5 to 2.0 micrometers, the thickness of the support structure can be reduced to minimize its impact on the overall thickness of the display panel, while ensuring sufficient mask support capacity, thus achieving a thinner and lighter design. On the other hand, by making the size L2 of the pixel-defining part 1.0 to 1.7 micrometers, the optical density (OD) of the pixel-defining part can be made not less than 1.0, ensuring sufficient light absorption and giving the display panel good contrast.
[0077] There is a logarithmic relationship between optical density and transmittance. The relationship for calculating total transmittance in the wavelength range of 380–780 nm is as follows: OD (380-780) =Log(1 / T) (380-780) )
[0078] In the above formula, Dλ represents the relative spectral power of the reference light source, Tλ represents the transmittance at different wavelengths, Vλ represents the photopic spectral luminous efficiency, and Δλ represents the wavelength interval.
[0079] Figure 5 is a schematic diagram of the spectral luminous efficiency distribution in the wavelength range of 380–780 nm.
[0080] As shown in Figure 5, Vλ has relatively low values in both the blue and red light bands, for example, 0 in the I band, 0.00064 in the H band, and 0.018 in the G band. Therefore, combining with the above formula, it can be seen that even if the transmittance Tλ increases, the change in total transmittance between wavelengths of 380 and 780 nanometers will be small, resulting in a smaller change in optical density. In other words, compared to using a black pixel-defining layer, when using a non-black pixel-defining layer, even if the transmittance increases, the change in optical density of the pixel-defining layer is smaller, thus ensuring good contrast (e.g., when the sub-pixels are not emitting light).
[0081] Figure 6 is a schematic diagram of a partial structure of a display panel.
[0082] As shown in Figure 6, the display panel includes multiple sub-pixels 10. Each sub-pixel 10 includes a first electrode 110, a second electrode 120, and a light-emitting functional layer 130 located between the first electrode 110 and the second electrode 120. The pixel defining portion 230 in the pixel defining portion 200 is used to define the pixel opening of the sub-pixel 10. Each sub-pixel 10 also includes a pixel circuit 140. The first electrode 110 of the sub-pixel 10 is electrically connected to the pixel circuit 140 through a via N0 penetrating the planarization layer 600. In this display panel, because the thickness of the pixel defining layer 200 (i.e., its dimension in the Z direction) is relatively small, generally not greater than 1.5 micrometers, the pixel defining layer 200 is prone to depression at the via N0, which can easily cause irregular reflection problems.
[0083] In some embodiments, as shown in FIG2, the sum of the dimensions L3 of the support structure 500 and the pixel defining portion 230 in direction Z is not less than 2 micrometers, for example, it can be 2.2 micrometers, 2.5 micrometers, 2.7 micrometers, 3 micrometers, 3.5 micrometers, or 3.7 micrometers. For example, when the pixel defining portion 230 uses positive or negative adhesive, the coating thickness of the positive or negative adhesive used to form the pixel defining portion and the support structure can be not less than 2 micrometers, thereby allowing sufficient filling at the vias, so that the final pixel defining portion has good flatness at the vias, reducing the risk of the pixel defining portion being recessed at the vias and causing the aforementioned irregular reflection problem.
[0084] In some embodiments, referring to Figures 2 and 9, at least a portion of the side edges of the cross-section of the support structure 500 cut by a plane have a first slope angle α, and at least a portion of the side edges of the cross-section of the pixel defining portion 230 cut by the plane have a second slope angle β, wherein the first slope angle α is smaller than the second slope angle β. The plane is perpendicular to the substrate 01 and parallel to the arrangement direction (e.g., direction X) of the adjacent sub-pixels 10 located on both sides of the pixel defining portion 230. For example, the plane is parallel to direction X and parallel to direction Z. For example, the cross-section of the support structure 500 cut by the plane is approximately trapezoidal, and the first slope angle α is the minimum angle between the side of the trapezoid and the surface of the pixel defining portion 230 away from the first electrode 110. For example, the second slope angle β is the minimum angle between at least a portion of the surface of the pixel defining portion 230 facing the pixel opening 210 and the first electrode 110.
[0085] In some embodiments, as shown in Figure 2, the first slope angle α can be 3 to 50 degrees. For example, the first slope angle α is less than 10 degrees, such as 3 to 5 degrees, 4 to 6 degrees, or 7 to 8 degrees. For example, the first slope angle α can also be 10 to 15 degrees, 18 to 20 degrees, 20 to 25 degrees, or 30 to 40 degrees.
[0086] By making the first slope angle smaller, the surface of the support structure away from the first electrode can transition smoothly, thereby reducing the risk of stress concentration and enabling the display panel to have safe and reliable performance.
[0087] In some embodiments, as shown in FIG2, the second slope angle β can be 20 to 60 degrees. For example, the second slope angle β can be 20 to 30 degrees, 35 to 40 degrees, 45 to 50 degrees or 55 to 60 degrees, which is beneficial to enable the sub-pixel to have a good light emission angle.
[0088] Figure 7 is another partial cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure. For example, compared with Figure 1, the colors of the color filter structures in the partial cross-sectional schematic diagram shown in Figure 7 are different, and the light-emitting functional layer 130 of the sub-pixel in Figure 7 emits different colors. For example, the plurality of color filter structures 310 in the display panel also include at least one second color filter structure 312, which is a second color and is different from the first color. For example, the first color filter structure 311 in Figure 1 is blue, and the light-emitting functional layer 130 of the sub-pixel 10 is configured to emit blue light. For example, the color filter structure in Figure 7 is green, and the light-emitting functional layer 130 of the sub-pixel 10 is configured to emit green light, and the color of the pixel limiting portion 230 in Figures 1 and 7 is blue. That is, the hue of the display panel is preferably adjusted to be more blue, that is, more biased towards the light-emitting functional layer 130 of the sub-pixel 10 shown in Figure 1.
[0089] In some embodiments, as shown in FIG7, the pixel defining portion 230 includes a side surface 231 surrounding the pixel opening 210, and the orthographic projection of the side surface 231 on the substrate 01 falls into the orthographic projection of the peripheral portion 112 of the first electrode 110 of each sub-pixel 10 on the substrate 01. The thickness of the pixel defining portion 230 gradually decreases in the direction approaching the pixel opening 210, thereby gradually increasing the transmittance of the pixel defining portion 230.
[0090] This configuration helps to block light transmitted from the side of the pixel definition portion through the first electrode, thereby reducing the risk of irregular reflection or diffraction of this portion of light onto the device located between the first electrode and the substrate.
[0091] In some embodiments, as shown in FIG1, the portion of the first color filter structure 311 exposed by the first opening 410 has a first orthographic projection on the substrate 01, and the first electrode 110 overlapping the first color filter structure 311 in a direction perpendicular to the substrate 01 has a second orthographic projection on the substrate 01, with the first orthographic projection falling within the second orthographic projection. For example, the orthographic projection of the second portion 302 of the first color filter structure 311 on the substrate 01 falls within the orthographic projection of the peripheral portion 112 of the first electrode 110 on the substrate 01.
[0092] This configuration allows the light transmitted from the second part of the first color filter structure to be blocked by the periphery of the first electrode, thereby reducing the risk of irregular reflection or diffraction of the light illuminating the device (e.g., pixel circuit) located between the first electrode and the substrate.
[0093] In some embodiments, as shown in FIG1, the second orthographic projection includes a portion located outside the first orthographic projection, and the minimum distance K between the edge of the first orthographic projection and the edge of the second orthographic projection is not less than 0.3 micrometers. That is, the second orthographic projection includes a portion extending beyond the first orthographic projection. For example, the minimum distance K can be 0.3 micrometers, 0.4 micrometers, or 0.5 micrometers, thereby ensuring the ability of the periphery of the first electrode to block light transmitted from the second portion of the first color filter structure, effectively reducing the risk of irregular reflection or diffraction.
[0094] In some embodiments, as shown in FIG1, when the transmittance of the pixel defining portion 230 to light having the same color as the color filter structure 310 corresponding to the sub-pixel 10 is not less than 10%, it is necessary to make the peripheral portion 112 of the first electrode 110 of the sub-pixel 10 block the light transmitted from the second portion 302 of the color filter structure 310. For example, when the color of the pixel defining portion 230 is purple and the color of the color filter structure 310 corresponding to the sub-pixel 10 is blue or red, it is necessary to block the light transmitted from the second portion 302 of the color filter structure 310 through the peripheral portion 112 of the first electrode 110 of the sub-pixel 10.
[0095] In some embodiments, as shown in FIG7, when the transmittance of the pixel defining portion 230 to light having the same color as the color filter structure 310 corresponding to the sub-pixel 10 is less than 10%, the peripheral portion 112 of the first electrode 110 of the sub-pixel 10 may or may not block the light transmitted from the second portion 302 of the color filter structure 310. For example, when the color of the pixel defining portion 230 is blue and the color of the color filter structure 310 corresponding to the sub-pixel 10 is green, the peripheral portion 112 of the first electrode 110 of the sub-pixel 10 may not block the light transmitted from the second portion 302 of the color filter structure 310.
[0096] In some implementations, as shown in FIG1, the display panel further includes a planarization layer 600, which is located between the pixel defining layer 200 and the substrate 01 and is in contact with the pixel defining layer 200. The planarization layer 600 has an absorption rate of not less than 90% for light from the first color filter structure 311. For example, when the transmittance of the pixel defining layer 200 for light of the first color is not less than 10%, if the pixel defining layer 200 has the same color as the first color filter structure 311, the planarization layer 600 can adopt a different color than the first color filter structure 311, thereby enhancing the absorption capability of light of the first color.
[0097] With this configuration, the planarization layer can absorb the light from the first color filter structure, thereby reducing the risk of irregular reflection or diffraction that the light would otherwise irradiate onto the device between the planarization layer and the substrate.
[0098] In some embodiments, as shown in FIG1, the planarization layer 600 is further configured to reflect at least a portion of the light from the first color filter structure 311. For example, the light from the first color filter structure 311 may be light from outside the display panel that has been transmitted through the first color filter structure 311, such as light of a first color, and at least a portion of this light can be transmitted from the pixel defining layer 200 to the planarization layer 600. The planarization layer 600 may reflect at least a portion of the first color light, meaning that at least a portion is not absorbed by the planarization layer 600 or is not transmitted through it. For example, the color of the planarization layer 600 may be non-black, such as red or blue, but is not limited thereto.
[0099] In some embodiments, as shown in FIG7, both the pixel defining layer 200 and the planarization layer 600 have an absorption rate of not less than 90% for light from the second color filter structure 312. For example, the color of the planarization layer 600 is different from the color of the pixel defining layer 200, and also different from the color of the second color filter structure 312. For example, the pixel defining layer 200 can be blue, the second color filter structure 312 can be green, and the planarization layer 600 can be yellow, but is not limited thereto.
[0100] With this configuration, after the pixel defining part absorbs the light of the second color from the second color filter structure once, the planarization layer can absorb the light transmitted from the pixel defining part a second time, thereby effectively preventing the light of the second color from shining on the device between the planarization layer and the substrate, thus preventing the risk of irregular reflection or diffraction.
[0101] In some embodiments, referring to FIG7, the color of the planarization layer 600 is the same as the color of the pixel defining layer 200, and both are different from the color of the second color filter structure 312. For example, the pixel defining portion 200 and the planarization layer 600 are both blue, and the second color filter structure 312 can be green, but is not limited thereto.
[0102] With this configuration, both the pixel definition section and the planarization layer can effectively absorb the light of the second color, thereby preventing the light of the second color from shining onto the device between the planarization layer and the substrate, thus avoiding the risk of irregular reflection or diffraction.
[0103] Figure 8 is a partial structural schematic diagram of another display panel provided by at least one embodiment of the present disclosure. Compared with Figure 1, in the display panel shown in Figure 8, the orthographic projection of the first electrode 110 of the sub-pixel 10 on the substrate 01 falls into the orthographic projection of the first opening 410 on the substrate 01. That is, the peripheral portion 112 of the first electrode 110 does not completely block the light transmitted from the second portion 302 of the first color filter structure 311. The rest of the structure can be referred to the relevant description of Figure 1 in the above embodiments, and will not be repeated here.
[0104] In some embodiments, as shown in FIG8, the color of the planarization layer 600 is different from the color of the pixel defining layer 200, and the color of the first color filter structure 311 is the same as the color of the pixel defining layer 200. For example, both the pixel defining portion 200 and the first color filter structure 311 can be blue, and the planarization layer 600 can also be yellow, but it is not limited thereto.
[0105] With this configuration, on the one hand, the pixel defining layer has a high transmittance for light of the first color, allowing some of the light of the first color to reach the surface of the first electrode 110 of the sub-pixel 10 away from the substrate 01, where it is reflected and then emitted after being transmitted sequentially through the pixel defining portion 230 and the first color filter structure 311. This allows the display panel to have a hue more biased towards the first color. On the other hand, since the planarization layer has an absorption rate of not less than 90% for light of the first color, it can prevent light of the first color from shining onto the devices between the planarization layer and the substrate, thus preventing the risk of irregular reflection or diffraction.
[0106] In some embodiments, referring to FIG1, the color of the pixel defining layer 200 can be blue, purple, red, or yellow. To maximize the light density of the pixel defining portion, the color of the pixel defining layer 200 is sequentially selected as: blue, purple, red, orange, and yellow, provided that it has at least 10% transmittance for light of the first color and at least 5% of the light of the first color is reflected from the surface of the first electrode 110 and transmitted from the pixel defining layer 200 to the first color filter structure 311.
[0107] In some embodiments, referring to FIG1, the pixel defining layer 200 may be a material made by mixing black with other pigments, so that the color of the pixel defining layer 200 is a mixture of black and other colors, such as black with blue, black with purple, black with red, black with yellow, or black with green.
[0108] In some embodiments, referring to FIG1, the pixel defining layer 200 may also be a material made by mixing two non-black pigments, such as a mixture of blue and red pigments, or a mixture of blue and yellow pigments.
[0109] In some embodiments, referring to FIG1, the pixel defining layer 200 may also employ a pigment of a single color, and the embodiments of this disclosure are not limited thereto.
[0110] In some embodiments, black pigments may include organic black pigments, inorganic black pigments, and dye blacks. For example, organic black pigments may include lactam pigments (i.e., black pigments consisting of compounds having a lactam structure), black pigments obtained by mixing red, green, purple, and blue pigments, perylene black (i.e., black pigments based on a perylene structure), RB black (i.e., black pigments obtained by mixing red and blue pigments), BY black (i.e., black pigments obtained by mixing blue pigment B and yellow pigment Y), anthocyanin black, or lignin black. For example, inorganic black pigments may include aniline black, perylene black, titanium black, carbon black, or combinations thereof. For example, dye blacks may include solvent black 3, solvent black 43, solvent black 46, solvent black 45, solvent black 50, etc.
[0111] For example, in some embodiments, the blue pigment may include Colour Index International (CI) pigment blue, such as CI Pigment Blue 1, CI Pigment Blue 2, CI Pigment Blue 15, CI Pigment Blue 15:1, CI Pigment Blue 15:2, CI Pigment Blue 15:3, CI Pigment Blue 15:4, CI Pigment Blue 15:6, CI Pigment Blue 16, CI Pigment Blue 22, CI Pigment Blue 29, CI Pigment Blue 60, CI Pigment Blue 64, CI Pigment Blue 66, CI Pigment Blue 79, CI Pigment Blue 80, CI Pigment Blue 87, or CI Pigment Blue 88, etc. For example, blue dyes such as CI Solvent Blue, CI Acid Blue, CI Direct Blue, CI Disperse Blue, CI Basic Blue, or CI Mordant Blue may also be used.
[0112] For example, in some embodiments, the green pigment may include CI pigment green, such as CI pigment green 7, CI pigment green 10, CI pigment green 36, CI pigment green 37, CI pigment green 38, CI pigment green 42, CI pigment green 58, CI pigment green 59, CI pigment green 62, CI pigment green 63, CI pigment green 64, CI pigment green 65, or CI pigment green 66. For example, green pigments such as CI solvent green, CI acid green, CI direct green, CI basic green, CI medium green, or CI reduction green may also be used.
[0113] For example, in some embodiments, the yellow pigment may include CI Pigment Yellow 129, CI Pigment Yellow 138, CI Pigment Yellow 139, CI Pigment Yellow 150, CI Pigment Yellow 185, CI Pigment Yellow 215, CI Pigment Yellow 231, and CI Pigment Yellow 233. For example, CI Solvent Yellow, CI Acid Yellow, CI Direct Yellow, CI Disperse Yellow, CI Mordant Yellow, and other yellow pigments may also be used.
[0114] In some embodiments, the purple pigment may include CI pigment violet 1, CI pigment violet 1:1, CI pigment violet 2, CI pigment violet 2:2, CI pigment violet 3, CI pigment violet 3:1, CI pigment violet 3:3, CI pigment violet 5, CI pigment violet 5:1, CI pigment violet 14, CI pigment violet 15, CI pigment violet 16, CI pigment violet 19, CI pigment violet 23, CI pigment violet 25, CI pigment violet 27, CI pigment violet 29, CI pigment violet 31, CI pigment violet 32, CI pigment violet 37, CI pigment violet 39, CI pigment violet 42, CI pigment violet 44, CI pigment violet 47, CI pigment violet 49, CI pigment violet 50, etc. For example, CI solvent violet, CI acid violet, CI direct violet, CI disperse violet, CI medium violet, CI basic violet, and other purple pigments may also be used.
[0115] In some embodiments, the orange pigment may include CI Pigment Orange 2, CI Pigment Orange 5, CI Pigment Orange 13, CI Pigment Orange 16, CI Pigment Orange 17:1, CI Pigment Orange 31, CI Pigment Orange 34, CI Pigment Orange 36, CI Pigment Orange 38, CI Pigment Orange 43, CI Pigment Orange 46, CI Pigment Orange 48, CI Pigment Orange 49, CI Pigment Orange 51, CI Pigment Orange 52, CI Pigment Orange 55, CI Pigment Orange 59, CI Pigment Orange 60, CI Pigment Orange 61, CI Pigment Orange 62, CI Pigment Orange 64, CI Pigment Orange 71, CI Pigment Orange 72, CI Pigment Orange 73, etc. For example, purple dyes such as CI Solvent Orange, CI Acid Orange, CI Direct Orange, CI Reactive Orange, and CI Mordant Orange Violet may also be used.
[0116] In some embodiments, the brown pigment may include CI Pigment Brown 23, CI Pigment Brown 25, CI Pigment Brown 26, CI Pigment Brown 28, CI Pigment Brown 32, CI Pigment Brown 41, CI Pigment Brown 42, etc. For example, CI Basic Brown, CI Reactive Brown, CI Direct Brown, CI Acid Brown, CI Disperse Brown, and other brown dyes may also be used.
[0117] In some embodiments, the red pigment may include CI Pigment Red 48:1, CI Pigment Red 122, CI Pigment Red 177, CI Pigment Red 224, CI Pigment Red 242, CI Pigment Red 269, CI Pigment Red 254, CI Pigment Red 291, CI Pigment Red 295, and CI Pigment Red 296. For example, CI Solvent Red, CI Acid Red, CI Direct Red, CI Basic Red, CI Reactive Red, CI Mordant Red, and other red pigments may also be used.
[0118] Figure 9 is a schematic diagram of another display panel provided in at least one embodiment of the present disclosure. Compared with Figure 1, the display panel shown in Figure 9 includes a support structure and the pixel defining portion includes a recessed portion. Other structures can be found in the relevant descriptions of Figure 1 in the above embodiments, and will not be repeated here.
[0119] In some embodiments, as shown in FIG9, the pixel defining layer 200 further includes at least one recess 240, and the thickness of the pixel defining layer 200 at the recess 240 is less than the average thickness of the pixel defining layer 200. For example, the thickness of the pixel defining layer 200 at the recess 240 can be 1 / 4 to 4 / 5 of the average thickness of the pixel defining layer 200, such as 1 / 4, 1 / 3, 1 / 2, 2 / 3, or 3 / 4, but is not limited thereto, and the embodiments of this disclosure do not limit this. For example, the recess 240 is formed during the fabrication of the pixel defining portion 230 using a halftone mask, thereby simplifying the fabrication process. For example, an infrared sensor 04 is provided on the side of the substrate 01 away from the sub-pixel 10, and by making the pixel defining layer 200 have the recess 240, the pixel defining layer 200 can have a greater transmittance to infrared light.
[0120] In some embodiments, as shown in FIG9, the light-shielding layer 400 further includes at least one second opening 420, the orthographic projection of the second opening 420 on the substrate 01 at least partially overlapping with the orthographic projection of the recess 240 on the substrate 01. For example, the orthographic projection of the second opening 420 on the substrate 01 falls into the orthographic projection of the recess 240 on the substrate 01.
[0121] This design enhances the light-shielding layer's ability to transmit infrared light, allowing infrared light to reach the recessed area and then the infrared sensor, thereby increasing the sensor's sensitivity.
[0122] In some embodiments, as shown in FIG9, the material of the light-shielding layer 400 can be carbon black, thereby enabling it to have good light-shielding performance.
[0123] In some embodiments, referring to FIG9, the transmittance of the light-shielding layer 400 to infrared light is not less than 60%. For example, the light-shielding layer 400 may not have the second opening 420, and the embodiments of this disclosure do not limit this.
[0124] Figure 10 is a partial structural schematic diagram of another display panel provided in at least one embodiment of the present disclosure. Compared with Figure 1, the structure of the pixel defining portion in the display panel shown in Figure 10 is different. Other structures can be found in the relevant descriptions of Figure 1 in the above embodiments, and will not be repeated here.
[0125] In some embodiments, as shown in FIG10, the pixel defining portion 230 includes a side surface 231 surrounding the pixel opening 210. The side surface 231 includes a first sub-side surface 2311, a connecting surface 2310, and a second sub-side surface 2312. The first sub-side surface 2311 is connected to the second sub-side surface 2312 via the connecting surface 2310. Both the first sub-side surface 2311 and the second sub-side surface 2312 extend in a direction away from the main body portion 111 of the first electrode 110. For example, the first sub-side surface 2311 is closer to the first electrode 110 of the sub-pixel 10 than the second sub-side surface 2312. For example, at least a portion of the first sub-side surface 2311 has a first sub-slope angle λ with a plane parallel to the substrate 01, at least a portion of the connecting surface 2310 is parallel to the substrate 01, and at least a portion of the second sub-side surface 2312 has a second sub-slope angle ε with a plane parallel to the substrate 01. For example, as shown in FIG10, the pixel defining portion 230 may have a "double-step" structure.
[0126] This helps to expand the light emission range of the sub-pixel, allowing the light emitted by the light-emitting functional layer to reach as much of the color filter structure as possible, thus facilitating the adjustment of the hue of the display panel to achieve the required color levels.
[0127] In some embodiments, as shown in FIG10, the first sub-slope angle λ and the second sub-slope angle ε are both 20-50 degrees, for example, 20-30 degrees, 25-35 degrees, 35-40 degrees, or 45-50 degrees, and the embodiments disclosed herein are not limited thereto. For example, the first sub-slope angle λ can be smaller than the second sub-slope angle ε, which is beneficial to expanding the light emission range of the sub-pixel. In some embodiments, the dimension of the connecting surface 2310 in the X direction can be 0.5-5.0 micrometers, such as 1.0-1.5 micrometers, 1.5-2.0 micrometers, 2.5-3.0 micrometers, 3.5-4.0 micrometers, or 4.5-5.0 micrometers, thereby allowing for reasonable control of the light emission angle of the sub-pixel.
[0128] Figure 11 is a schematic block diagram of a display device according to another embodiment of the present disclosure. As shown in Figure 11, a display device provided in an embodiment of the present disclosure includes any of the above-described display panels.
[0129] For example, the display device can be an organic light-emitting diode display device or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator that includes the display device. This embodiment is not limited to this.
[0130] The following points need to be explained:
[0131] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.
[0132] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.
[0133] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.
Claims
1. A display panel, comprising: Substrate; Multiple sub-pixels are located on the substrate. Each sub-pixel includes a light-emitting functional layer and a first electrode and a second electrode located on both sides of the light-emitting functional layer in a direction perpendicular to the substrate. The first electrode is located between the light-emitting functional layer and the substrate. A pixel defining layer, at least a portion of which is located between the light-emitting functional layer and the first electrode, the pixel defining layer including a plurality of pixel openings and pixel defining portions located between adjacent pixel openings, each pixel opening exposing at least a portion of the first electrode; A color filter layer is located on the side of the plurality of sub-pixels away from the substrate, and the color filter layer includes a plurality of color filter structures; A light-shielding layer, at least partially located between the color filter layer and the pixel defining layer, the light-shielding layer including a plurality of first openings, each first opening exposing at least a portion of the color filter structure; Each of the sub-pixels has a first electrode comprising a main body portion and a peripheral portion connected to each other. The main body portion is exposed by the pixel opening, and the peripheral portion is located between the pixel defining portion and the substrate. Each color filter structure comprises a first portion and a second portion. The orthographic projection of the first portion on the substrate at least partially overlaps with the orthographic projection of the main body portion of the first electrode on the substrate. The orthographic projection of the second portion on the substrate at least partially overlaps with the orthographic projection of the peripheral portion of the first electrode on the substrate. The plurality of color filter structures include at least one first color filter structure, the color of the first color filter structure being a first color, and the pixel defining layer being configured to transmit light of the first color with a transmittance of at least 10%.
2. The display panel according to claim 1, wherein, The pixel-defining layer is also configured to reflect at least a portion of the light from the first color filter structure.
3. The display panel according to claim 1, further comprising: At least one support structure is located on the side of the pixel defining portion away from the substrate, and the support structure and the pixel defining portion are configured to be formed using the same film layer through a halftone mask.
4. The display panel according to claim 3, wherein, At least a portion of the side edges of the cross section of the support structure cut by a plane have a first slope angle, and at least a portion of the side edges of the cross section of the pixel defining portion cut by the plane have a second slope angle. The first slope angle is smaller than the second slope angle. The plane is perpendicular to the substrate and parallel to the arrangement direction of adjacent sub-pixels located on both sides of the pixel defining portion.
5. The display panel according to claim 4, wherein, The first slope angle is 3 to 50 degrees, and the second slope angle is 20 to 60 degrees.
6. The display panel according to claim 4 or 5, wherein, The first slope angle is less than 10 degrees.
7. The display panel according to any one of claims 3 to 6, wherein, In the direction perpendicular to the substrate, the size of the support structure is 0.5 to 2.0 micrometers, and the size of the pixel defining portion is 1.0 to 1.7 micrometers.
8. The display panel according to any one of claims 3 to 7, wherein, In a direction perpendicular to the substrate, the sum of the dimensions of the support structure and the pixel defining portion is not less than 2 micrometers.
9. The display panel according to any one of claims 1 to 8, wherein, The pixel-defining layer includes at least one of black pigment, blue pigment, purple pigment, red pigment, orange pigment, and yellow pigment.
10. The display panel according to any one of claims 1 to 9, wherein, The pixel defining portion includes a side surface surrounding the pixel opening of the sub-pixel, the orthographic projection of the side surface on the substrate falling into the orthographic projection of the periphery of the first electrode of the sub-pixel on the substrate.
11. The display panel according to any one of claims 1 to 10, wherein, The portion of the first color filter structure exposed by the first opening has a first orthographic projection on the substrate, and the first electrode overlapping the first color filter structure in a direction perpendicular to the substrate has a second orthographic projection on the substrate, with the first orthographic projection falling into the second orthographic projection.
12. The display panel according to claim 10, wherein, The second orthographic projection includes the portion located outside the first orthographic projection, and the minimum distance between the edge of the first orthographic projection and the edge of the second orthographic projection is not less than 0.3 micrometers.
13. The display panel according to any one of claims 1 to 12, further comprising: A planarization layer is located between the pixel defining layer and the substrate, and is in contact with the pixel defining layer. The planarization layer has an absorption rate of not less than 90% for light from the first color filter structure.
14. The display panel according to claim 13, wherein, The planarization layer is also configured to reflect at least a portion of the light from the first color filter structure.
15. The display panel according to claim 13 or 14, wherein, The plurality of color filter structures further includes at least one second color filter structure, the second color filter structure being a second color and the second color being different from the first color, and both the pixel defining layer and the planarization layer having an absorption rate of not less than 90% for light from the second color filter structure.
16. The display panel according to claim 15, wherein, The color of the planarization layer is the same as the color of the pixel definition layer, and both are different from the color of the second color filter structure.
17. The display panel according to claim 15, wherein, The color of the planarization layer is different from the color of the pixel definition layer, and both are different from the color of the second color filter structure.
18. The display panel according to claim 13 or 14, wherein, The color of the planarization layer is different from the color of the pixel-defining layer, and the color of the first color filter structure is the same as the color of the pixel-defining layer.
19. The display panel according to any one of claims 1 to 18, wherein, The pixel defining layer further includes at least one recess, the thickness of the pixel defining layer at the recess is less than the average thickness of the pixel defining layer, and the recess is formed during the fabrication process using a halftone mask.
20. The display panel according to claim 19, wherein, The light-shielding layer further includes at least one second opening, the orthographic projection of the second opening on the substrate at least partially overlapping the orthographic projection of the recess on the substrate.
21. The display panel according to claim 19 or 20, wherein, The light-shielding layer has a transmittance of no less than 60% for infrared light.
22. The display panel according to any one of claims 1 to 21, wherein, The pixel defining portion includes a side surface surrounding the pixel opening. The side surface includes a first sub-side surface, a connecting surface, and a second sub-side surface. The first sub-side surface is connected to the second sub-side surface via the connecting surface. Both the first sub-side surface and the second sub-side surface extend in a direction away from the main body portion of the first electrode that overlaps with the pixel opening. At least a portion of the first sub-side surface has a first sub-slope angle between itself and a plane parallel to the substrate, at least a portion of the connecting surface is parallel to the substrate, and at least a portion of the second sub-side surface has a second sub-slope angle between itself and a plane parallel to the substrate.
23. The display panel according to claim 22, wherein, Both the first sub-slope angle and the second sub-slope angle are 20 to 50 degrees.
24. A display device comprising the display panel as described in any one of claims 1 to 23.