Display panel and manufacturing method therefor, and display device

Abstract

The present disclosure relates to a display panel and a manufacturing method therefor, and a display device. The display panel comprises: a base substrate, a plurality of light-emitting units, a light-shielding portion, and a plurality of light-filtering portions. The plurality of light-emitting units are located on a side of the base substrate. The light-shielding portion is located on the side of the plurality of light-emitting units away from the base substrate and is provided with a plurality of light-transmitting openings, and the orthographic projections of the light-transmitting openings on the base substrate overlap the orthographic projections of the light-emitting units on the base substrate. At least a part of each light-filtering portion is located in the corresponding light-transmitting opening. The light-shielding portion comprises a first transflective layer, a first light-transmitting layer, and a reflective layer which are sequentially arranged in a direction away from the base substrate. The first transflective layer, the first light-transmitting layer, and the reflective layer form a first optical resonant cavity structure, and the first optical resonant cavity structure is configured to shield light emitted from the light-emitting units. In the present disclosure, the first optical resonant cavity structure can achieve the light shielding function, thereby improving the contrast, and avoiding color light crosstalk.

Description

Display panel, preparation method thereof and display device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] The display panel generally comprises a substrate, a plurality of light emitting units on one side of the substrate, and a light shielding portion and a plurality of light filtering portions on the side of the light emitting units away from the substrate. The light shielding portion is provided with a plurality of light transmission openings, and the light transmission openings are arranged opposite to the light emitting units, and the light filtering portions are arranged in the light transmission openings. Among them, the plurality of light filtering portions include light filtering portions of different colors, and the light filtering portions can transmit the light emitted by the light emitting units to make the emitted light the required color. For example, the light filtering portion includes a red light filtering portion, and the light filtering portion can transmit red light. The light shielding portion can shield the light emitted by the light emitting units, and has the effects of preventing light leakage, avoiding color confusion, and improving contrast. SUMMARY

[0003] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and proposes a display panel, a preparation method thereof and a display device.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a display panel, comprising:

[0005] a substrate;

[0006] a plurality of light emitting units on one side of the substrate;

[0007] a light shielding portion on the side of the plurality of light emitting units away from the substrate, and provided with a plurality of light transmission openings, and the orthogonal projection of the light transmission openings on the substrate overlaps with the orthogonal projection of the light emitting units on the substrate;

[0008] a plurality of light filtering portions, at least part of the light filtering portions being arranged in the light transmission openings;

[0009] Among them, the light shielding portion comprises, arranged in sequence in the direction away from the substrate: a first transmission-reflection layer, a first light transmission layer and a reflection layer, the first transmission-reflection layer, the first light transmission layer and the reflection layer form a first optical resonant cavity structure, and the first optical resonant cavity structure is used for shielding the emitted light of the light emitting units.

[0010] In some embodiments, the light filtering part comprises, sequentially arranged in a direction away from the substrate base plate, a second transmissive and reflective layer, a second light transmissive layer, and a third transmissive and reflective layer, and the second transmissive and reflective layer, the second light transmissive layer, and the third transmissive and reflective layer form a second optical resonant cavity structure, wherein the cavity lengths of at least two second optical resonant cavity structures are different, and the light colors transmitted by the second optical resonant cavity structures with different cavity lengths are different.

[0011] In some embodiments, the material of the second transmissive and reflective layer and the material of the third transmissive and reflective layer both comprise at least one of Ag and Al.

[0012] In some embodiments, the second light transmissive layer is multilayered and arranged in a stacking manner in the thickness direction of the display panel, and the light filtering part further comprises a refractive layer between any two adjacent second light transmissive layers, and the refractive index of the refractive layer is greater than the refractive index of any one of the second light transmissive layers.

[0013] In some embodiments, the thickness of the refractive layer is less than the thickness of any one of the second light transmissive layers.

[0014] In some embodiments, the material of the refractive layer comprises germanium.

[0015] In some embodiments, the light filtering part further comprises a first anti-reflection film between the second transmissive and reflective layer and the substrate base plate, and a second anti-reflection film on the side of the third transmissive and reflective layer away from the substrate base plate.

[0016] In some embodiments, the thicknesses of the first anti-reflection film and the second anti-reflection film are both less than the thickness of the second light transmissive layer.

[0017] In some embodiments, the second transmissive and reflective layer and the first transmissive and reflective layer are connected as an integral structure, and / or the third transmissive and reflective layer and the reflective layer are connected as an integral structure.

[0018] In some embodiments, the material of the second light transmissive layer comprises a first phase change material, and the material of the first light transmissive layer comprises the first phase change material after plasma treatment.

[0019] Alternatively, the materials of the second light transmissive layer and the first light transmissive layer both comprise the first phase change material after plasma treatment, and the electron densities of the second light transmissive layer and the first light transmissive layer are different, and the dielectric constants of the second light transmissive layer and the first light transmissive layer are different.

[0020] In some embodiments, the first phase change material comprises a first compound, and the first compound comprises at least one of Ge2Sb2Te5 and VO2, or at least one of IGZO and WO3.

[0021] In some embodiments, the material of the first transflective layer and the material of the reflective layer each comprises at least one of Ag and Al.

[0022] The present disclosure also provides a method for manufacturing a display panel, comprising:

[0023] providing a substrate substrate;

[0024] forming a plurality of light emitting units on one side of the substrate substrate;

[0025] forming a light shielding portion and a light filtering portion on the side of the light emitting units away from the substrate substrate, the light shielding portion being provided with a plurality of light transmitting openings, a normal projection of the light transmitting openings on the substrate substrate overlapping a normal projection of the light emitting units on the substrate substrate, the light shielding portion comprising, in sequence in a direction away from the substrate substrate: a first transflective layer, a first light transmitting layer, and a reflective layer, the first transflective layer, the first light transmitting layer, and the reflective layer forming a first optical resonant cavity structure for shielding outgoing light rays of the light emitting units, at least part of the light filtering portion being located within a light transmitting opening.

[0026] In some embodiments, the step of forming a light shielding portion and a light filtering portion on the side of the light emitting units away from the substrate substrate comprises:

[0027] forming a second transflective layer and a first transflective layer connected as an integral structure on the side of the light emitting units away from the substrate substrate;

[0028] forming a first light transmitting material layer on the side of the first transflective layer away from the substrate substrate, the first light transmitting material layer being provided with a plurality of first openings, a normal projection of the first openings on the substrate substrate overlapping a normal projection of the light emitting units on the substrate substrate;

[0029] forming a second light transmitting material layer within the first openings;

[0030] subjecting at least a first light transmitting material layer of the first light transmitting material layer and the second light transmitting material layer to plasma treatment to obtain a first light transmitting layer and a second light transmitting layer;

[0031] forming a third transflective layer and a reflective layer connected as an integral structure on the side of the first light transmitting layer and the second light transmitting layer away from the substrate substrate;

[0032] wherein the second transflective layer, the second light transmitting layer, and the third transflective layer constitute the light filtering portion, and the first transflective layer, the first light transmitting layer, and the reflective layer constitute the light shielding portion.

[0033] The present disclosure also provides a display device comprising the display panel as claimed in any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of the specification. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0035] FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel in some embodiments;

[0036] FIG. 2 is a schematic diagram of a preparation process of a light-blocking portion and a color filter layer in some embodiments;

[0037] FIG. 3 is a schematic diagram of a cross-sectional structure of a display panel in some embodiments of the present disclosure;

[0038] FIG. 4A is a transmission spectrum of a first light-transmitting layer in a first optical resonant cavity structure without being treated by plasma;

[0039] FIG. 4B is a transmission spectrum of the first light-transmitting layer in the first optical resonant cavity structure after being treated by plasma;

[0040] FIG. 5 is a graph showing the relationship between the real part and the imaginary part of the dielectric constant of IGZO and wavelength;

[0041] FIG. 6 is a schematic diagram of a cross-sectional structure of a light-filtering portion in some embodiments of the present disclosure;

[0042] FIG. 7 is a schematic diagram of a cross-sectional structure of a light-filtering portion in some other embodiments of the present disclosure;

[0043] FIG. 8 is a schematic diagram of a cross-sectional structure of a light-filtering portion in some other embodiments of the present disclosure;

[0044] FIG. 9 is a schematic diagram of a cross-sectional structure of a display panel in some other embodiments of the present disclosure;

[0045] FIG. 10 is a schematic diagram of a preparation process of a light-blocking portion and a light-filtering portion in some embodiments of the present disclosure;

[0046] FIG. 11A is a transmission spectrum of an IGZO dynamic tuning structure in some embodiments of the present disclosure;

[0047] FIG. 11B is a transmission spectrum of the IGZO dynamic tuning structure in some embodiments of the present disclosure;

[0048] FIG. 11C is a transmission spectrum of the IGZO dynamic tuning structure in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0049] The specific embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0050] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present disclosure with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only some but not all of the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present disclosure.

[0051] Unless otherwise defined, technical terms or scientific terms used in the embodiments of the present disclosure shall have the ordinary meanings understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, the terms "include", "comprise", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" and "couple" and similar terms do not limit to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and when the absolute positions of the described objects are changed, the relative positions can also be changed accordingly.

[0052] As used herein, "parallel", "perpendicular" include the stated case and a case similar to the stated case within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art considering the measurement being discussed and the error related to the measurement of a specific quantity (i.e., the limitation of the measurement system). For example, "parallel" includes absolute parallel and approximate parallel, wherein the acceptable deviation range of approximate parallel may, for example, be within 5°; "perpendicular" includes absolute perpendicular and approximate perpendicular, wherein the acceptable deviation range of approximate perpendicular may, for example, also be within 5°.

[0053] It should be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or an intervening layer can also be present between the layer or element and the other layer or substrate.

[0054] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are schematic and are not intended to be drawn to scale. Specifically, the dimensions of the various features in the drawings can be exaggerated relative to other features to help improve understanding of some exemplary embodiments. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result from manufacturing. For example, a region illustrated or described as a rectangle can have rounded or curved corners and / or sides. Thus, the exemplary embodiments are to be understood described using terminology and description specifically devised to convey the subject matter in a single format, and are not intended to be construed as limitations on the scope of the exemplary embodiments. The singular forms "a," "an," and "the" include plural referents, unless the context clearly dictates otherwise.

[0055] In the related art, a display device generally implements a light filtering function through a color filter portion to achieve color display. Meanwhile, a light shielding portion such as a black matrix (BM) is used to prevent light leakage, avoid color confusion, and improve contrast, etc.

[0056] FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel in some embodiments.

[0057] Specifically, as shown in FIG. 1, the existing display panel includes a substrate substrate 1, a driving circuit layer 2, a light emitting unit layer 3, an encapsulation layer 4, a protection layer 7, a touch layer 8, an optical adhesive layer 9, and a cover layer 10, which are sequentially stacked. The display panel further includes a light shielding portion 5 and a color film layer between the encapsulation layer 4 and the protection layer 7.

[0058] The driving circuit layer 2 includes a plurality of thin film transistors, and the light emitting unit layer 3 includes a plurality of light emitting units. The thin film transistors are electrically connected to the light emitting units, and are configured to provide driving signals to the light emitting units to cause the light emitting units to emit light.

[0059] The light shielding portion 5 is provided with a plurality of light transmission openings, and the light transmission openings are arranged opposite to the light emitting units. The color film layer includes a plurality of filter portions 6, and at least part of the filter portions 6 are located in the light transmission openings, and are configured to filter light of the light emitting units and transmit light of a certain color.

[0060] The light emitting units can emit white light, or emit light of the same color as the color of light that the filter portions 6 can transmit.

[0061] For example, the light emitting units emit white light, and the filter portions 6 include a red filter portion, a green filter portion, and a blue filter portion. The red filter portion is configured to transmit red light, the green filter portion is configured to transmit green light, and the blue filter portion is configured to transmit blue light.

[0062] For example, the light emitted by multiple light-emitting units can include various colors of light, and the color that the filter 6 can transmit is the same as the color of the light emitted by the corresponding light-emitting unit. Specifically, if a light-emitting unit emits red light, the corresponding filter 6 is a red filter, which can transmit red light. If a light-emitting unit emits green light, the corresponding filter 6 is a green filter. If a light-emitting unit emits blue light, the corresponding filter 6 is a blue filter.

[0063] Figure 2 is a schematic diagram of the preparation process of the light-shielding part 5 and the color filter layer in some embodiments.

[0064] Specifically, the preparation process of the light-shielding part 5 and the color filter layer includes:

[0065] Step S1, as shown in Figure 2(a), a light-shielding material layer 50 is formed on the side of the encapsulation layer 4 away from the light-emitting unit layer 3 (not shown in the figure).

[0066] Step S2, as shown in Figure 2(b), the light-shielding material layer 50 is patterned to form a light-shielding part 5 with multiple light-transmitting openings.

[0067] Step S3, as shown in Figure 2(c), a light filter material layer 60 is formed on the side of the light-shielding part 5 away from the encapsulation layer 4. Specifically, a first color light filter material layer 610 is formed.

[0068] Step S4, as shown in Figure 2(d), the first color filter material layer 610 is patterned to form a plurality of first color filter portions 601. The first color filter portion 601 may be, for example, a filter portion 6 capable of transmitting blue light, i.e., a blue filter portion.

[0069] Step S5, as shown in (e) of Figure 2, a second color filter material layer 620 is formed on the side of the light-shielding part 5 away from the encapsulation layer 4.

[0070] Step S6: As shown in Figure 2(f), the second color filter material layer 620 is patterned to form a plurality of second color filter portions 602. The second color filter portion 602 may be, for example, a filter portion 6 capable of transmitting green light, i.e., a green filter portion.

[0071] Step S7, as shown in (g) of Figure 2, a third color filter material layer 630 is formed on the side of the light-shielding part 5 away from the encapsulation layer 4.

[0072] Step S8: As shown in (h) of Figure 2, the third color filter material layer 630 is patterned to form a plurality of third color filter sections 603. The third color filter section 603 may be, for example, a filter section 6 capable of transmitting red light, i.e., a red filter section.

[0073] It is understandable that, in the above preparation process, the first color filter 601, the second color filter 602, and the third color filter 603 are located in different light-transmitting openings.

[0074] As can be seen from the above, the preparation of the light-shielding part 5 and the color filter layer requires the patterning of the light-shielding material layer 50 and the light-filtering material layer 60 respectively, which is a relatively complex process with a low tolerance for error.

[0075] Furthermore, during long-term use, the optical performance of the filter unit 6 will significantly decline due to the accumulation of usage time and environmental factors such as ultraviolet radiation, resulting in poor reliability and affecting the color display of the display device. Additionally, the filter unit 6 may also have the problem of insecure curing and easy detachment.

[0076] The main components of a black matrix typically include carbon black, dispersant, alkali-soluble resin, monomer, photoinitiator, and additives. The main preparation process for forming a patterned black matrix involves coating, exposure, development, and post-baking of these materials. During exposure, a portion of the coated black matrix material is irradiated with ultraviolet light, activating the photoinitiator and triggering a cross-linking polymerization reaction of the monomers, causing this portion of the black matrix material to solidify. Then, during the development stage, an alkaline developer dissolves the uncured portions of the black matrix material, forming a pattern that yields the light-shielding portion 5.

[0077] Because existing black matrix materials contain carbon black, which reflects light, the black matrix has a high reflectivity. Furthermore, due to the presence of carbon black, during the exposure process in black matrix fabrication, the carbon black reflects the ultraviolet light irradiating the black matrix material, reducing the amount of ultraviolet light available for monomer absorption, thus prolonging the curing time and reducing curing efficiency.

[0078] In order to at least alleviate or solve one of the aforementioned technical problems, this disclosure provides a display panel, a method for manufacturing the same, and a display device.

[0079] Figure 3 is a schematic cross-sectional view of the display panel in some embodiments of this disclosure.

[0080] In some embodiments, as shown in FIG3, a display panel of the present disclosure includes: a substrate 1, a light-emitting unit layer 3 located on one side of the substrate 1, and a light-shielding portion 5 and a color filter layer located on the side of the light-emitting unit layer 3 away from the substrate 1. The light-emitting unit layer 3 includes a plurality of light-emitting units (not shown in the figure). The color filter layer includes a plurality of light-filtering portions 6.

[0081] The light-shielding part 5 has multiple light-transmitting openings. The orthographic projection of the light-transmitting openings on the substrate 1 overlaps with the orthographic projection of the light-emitting unit on the substrate 1. For example, the orthographic projection of the light-transmitting openings on the substrate 1 covers the orthographic projection of the light-emitting unit on the substrate 1. At least a portion of the light-filtering part 6 is located in the light-transmitting openings.

[0082] The light-shielding part 5 includes a first transflective layer 51, a first light-transmitting layer 52 and a reflective layer 53 arranged sequentially along the direction away from the substrate 1. The first transflective layer 51, the first light-transmitting layer 52 and the reflective layer 53 form a first optical resonant cavity structure, which is used to block the emitted light from the light-emitting unit.

[0083] In this embodiment, the first optical resonant cavity structure formed by the first transflective layer 51, the first light-transmitting layer 52, and the reflective layer 53 can absorb the light emitted by the light-emitting unit. Therefore, the light emitted by the light-emitting unit has a very low transmittance after passing through the first optical resonant cavity structure, for example, the transmittance is only about 5%. Therefore, this embodiment can block the light emitted by the light-emitting unit through the first optical resonant cavity structure, thereby achieving the light-blocking function.

[0084] Optionally, the first optical resonant cavity structure is an FP resonant structure. Specifically, an FP resonant structure can be a Fabry-Pérot cavity, also known as a plane-parallel cavity, which is a type of optical resonant cavity composed of two parallel plane mirrors. The first transflective layer 51 and the reflective layer 53 constitute these two parallel plane mirrors.

[0085] In some embodiments, the materials of the first transflective layer 51 and the reflective layer 53 both include at least one of Ag and Al.

[0086] For example, the materials of the first reflective layer 51 and the reflective layer 53 are both Ag, forming an Ag metal mirror. The reflective effect of the first reflective layer 51 and the reflective effect of the reflective layer 53 can be adjusted by setting the thickness of the Ag metal mirror.

[0087] In some embodiments, the material of the first light-transmitting layer 52 includes a first phase change material that has undergone plasma treatment.

[0088] In this embodiment of the disclosure, the first phase change material (PCM) can adjust the wavelength of light that can be transmitted through the first optical resonant cavity structure by adjusting conditions such as temperature, voltage, or carrier concentration.

[0089] Furthermore, the first phase change material after plasma treatment can shift the resonant wavelength of light in the first optical resonant cavity structure, thereby reducing the amount of light transmitted through the first optical resonant structure and thus achieving the blocking of light by the first optical resonant structure.

[0090] Figure 4A shows the transmission spectrum of the first light-transmitting layer 52 in the first optical resonant cavity structure before it was treated with H2 plasma, and Figure 4B shows the transmission spectrum of the first light-transmitting layer 52 in the first optical resonant cavity structure after it was treated with H2 plasma.

[0091] As shown in Figure 4A, for the first optical resonant cavity structure where the first light-transmitting layer 52 is not treated by H2 plasma, the first optical resonant cavity structures with different cavity lengths can transmit blue light, green light and red light respectively.

[0092] As shown in Figure 4B, for the first optical resonant cavity structure whose first light-transmitting layer 52 has been treated with H2 plasma, the first optical resonant cavity structures with different cavity lengths have very low transmittance for blue light, green light and red light.

[0093] Therefore, after the first light-transmitting layer 52 in the first optical resonant cavity structure is treated with H2 plasma, it can achieve the light-shielding effect of the light-shielding layer, with a light transmittance of less than 5%, thereby improving the contrast.

[0094] In some embodiments, the first phase change material includes a first compound, which includes at least one of Ge2Sb2Te5 (germanium antimony tellurium) and VO2 (vanadium dioxide), or at least one of IGZO (indium gallium zinc oxide) and WO3 (tungsten trioxide).

[0095] In the example where the first compound includes Ge2Sb2Te5 and / or VO2, the wavelength of light that can be transmitted through the first optical resonant cavity structure can be adjusted by regulating the temperature, so that the light emitted by the light-emitting unit cannot pass through the first optical resonant cavity structure, thereby achieving blocking.

[0096] In examples where the first compound includes IGZO and / or WO3, the wavelength of light that can be transmitted through the first optical resonant cavity structure can be adjusted by regulating the voltage or carrier concentration, so that the light emitted by the light-emitting unit cannot pass through the first optical resonant cavity structure, thereby achieving blocking.

[0097] In some embodiments, as shown in FIG3, the filter section 6 includes a second transflective layer 61, a second light-transmitting layer 62 and a third transflective layer 63 disposed sequentially along a direction away from the substrate 1, and the second transflective layer 61, the second light-transmitting layer 62 and the third transflective layer 63 form a second optical resonant cavity structure, wherein at least two of the second optical resonant cavity structures have different cavity lengths, and the light transmitted by the second optical resonant cavity structures with different cavity lengths has different colors.

[0098] Color originates from the interaction of light and matter in nature and is divided into chemical colors and physical colors (structural colors). The most common chemical colors are pigments and dyes, which produce different colors within the visible light range by absorbing specific light. However, chemical colors typically have low color vibrancy, a small color gamut, and low spatial resolution. Current color filters are generally formed using color resist materials, which are chemical colors. Therefore, color filters are easily exposed to long-term ultraviolet radiation, leading to a significant decline in optical performance.

[0099] Structural colors refer to the various colors produced by the refraction, diffuse reflection, diffraction, or interference of light waves due to the special ordered structure of the molecules in a substance. Compared with chemical colors, they have the characteristics of high color reflectivity, high saturation, resistance to fading, and environmental friendliness. This embodiment utilizes a second optical resonant cavity structure to achieve color display using chemical colors.

[0100] Specifically, in this embodiment, structural color can be achieved through the second optical resonant cavity structure, that is, colored light can be transmitted through the second optical resonant cavity structure, thereby improving the transmittance of the light emitted by the light-emitting unit and increasing the utilization rate of light. Furthermore, this embodiment can further adjust the color of the transmitted colored light by adjusting the cavity length of the second optical resonant cavity structure.

[0101] For example, in one embodiment, the cavity length of the second optical resonant cavity structure is 170 nm. Light emitted from the light-emitting unit enters this second optical resonant cavity and resonates within it, with a resonance wavelength of 438 nm. This means that light with a wavelength near 438 nm can pass through the second optical resonant cavity and exit, indicating that this second optical resonant cavity structure can transmit blue light. Furthermore, in one example where the light-emitting unit emits blue light, the transmittance of the blue light can reach greater than or equal to 60%, compared to only about 42% transmittance of the blue filter portion 6 in the color filter layer. Therefore, the second optical resonant cavity structure of this embodiment can improve the transmittance of blue light.

[0102] In another example, the cavity length of the second optical resonant cavity structure is 90 nm. Light emitted from the light-emitting unit enters this second optical resonant cavity and resonates within it, with a resonant wavelength of 550 nm. This means that light with a wavelength around 550 nm can pass through the second optical resonant cavity and exit, indicating that this second optical resonant cavity structure can transmit green light. Furthermore, in one example where the light-emitting unit emits green light, the transmittance of the green light can reach greater than or equal to 56%. Compared to the green filter portion 6 in the color filter layer, which has a transmittance of only about 50%, the second optical resonant cavity structure of this embodiment can improve the transmittance of green light.

[0103] In another example, the cavity length of the second optical resonant cavity structure is 125 nm. Light emitted from the light-emitting unit enters this second optical resonant cavity and resonates within it, with a resonance wavelength of 676 nm. This means that light with a wavelength near 676 nm can pass through the second optical resonant cavity and exit, indicating that this second optical resonant cavity structure can transmit red light. Furthermore, in one example where the light-emitting unit emits red light, the transmittance of the red light can reach greater than or equal to 50%. Compared to the red filter portion 6 in the color filter layer, which has a transmittance of only about 50%, the second optical resonant cavity structure of this embodiment can improve the transmittance of red light.

[0104] Therefore, in this embodiment of the present disclosure, different second optical resonant cavity structures can be configured with different cavity lengths, thereby enabling the second optical resonant cavity structure to emit different colors of light, so that the display device can achieve color display.

[0105] Specifically, in one example, the light-emitting unit emits white light, and the white light can be filtered by a second optical resonant cavity structure with different cavity lengths to emit blue light, red light, green light, and other colored light respectively.

[0106] In another example, the multiple light-emitting units include multiple units emitting blue light, multiple units emitting red light, and multiple units emitting green light. In this case, the cavity length of the second optical resonator structure should match the color of the light emitted by the light-emitting units.

[0107] Specifically, the cavity length of the second optical resonant cavity structure corresponding to the light-emitting unit that emits blue light is adjusted so that the second optical resonant cavity structure can transmit blue light of a certain wavelength, thereby filtering the blue light emitted by the light-emitting unit.

[0108] The cavity length of the second optical resonant cavity structure corresponding to the light-emitting unit that emits red light is adjusted so that the second optical resonant cavity structure can transmit red light of a certain wavelength, thereby filtering the red light emitted by the light-emitting unit.

[0109] The cavity length of the second optical resonant cavity structure corresponding to the light-emitting unit that emits green light is adjusted so that the second optical resonant cavity structure can transmit green light of a certain wavelength, thereby filtering the green light emitted by the light-emitting unit.

[0110] In this embodiment, the second optical resonant cavity structure can further filter the colored light emitted by the light-emitting unit, resulting in higher color saturation of the transmitted light. Furthermore, compared to the color filter layer in the prior art, the second optical resonant cavity structure in this embodiment has higher light transmittance.

[0111] In fact, the second optical resonant cavity structure in this embodiment can obtain light of any color in the visible light band, and has advantages such as low power consumption, high color gamut, ultraviolet insensitivity (optical performance is not affected by ultraviolet radiation) and angle insensitivity (optical performance is not affected by the incident angle of light from the light-emitting unit).

[0112] Optionally, the second optical resonant cavity structure can be, for example, an FP resonant structure. The second reflective layer 61 and the third reflective layer 63 constitute two parallel planar mirrors.

[0113] In some embodiments, the materials of the second reflective layer 61 and the third reflective layer 63 both include at least one of Ag and Al. For example, the materials of the second reflective layer 61 and the third reflective layer 63 both include Ag.

[0114] In this embodiment, Ag is selected as the metal mirror, which can utilize Ag's high reflectivity and low absorptivity to improve the transmittance of light emitted by the light-emitting unit in the filter section 6.

[0115] In some embodiments, the material of the second light-transmitting layer 62 includes a first phase change material, or a first phase change material treated with plasma.

[0116] In this embodiment, the first phase change material can adjust the wavelength of light that the first optical resonant cavity structure can transmit by adjusting conditions such as temperature, voltage, or carrier concentration, and further combine the cavity length of the first optical resonant cavity structure to achieve the transmission function of different colors of light.

[0117] The second transparent layer 62 formed by the first phase change material in this embodiment can achieve dynamic tuning of the structural color. In a specific example, the second transparent layer 62 formed using IGZO can not only produce high-purity transmitted colors, but its carrier concentration can also be adjusted through doping and H2 plasma treatment (H2 plasma). + +O 2- =OH - Adjustments can be made using methods such as +e). Therefore, the material of the second light-transmitting layer 62 may also include the first phase change material after plasma treatment.

[0118] Figure 5 shows the relationship between the real and imaginary parts of the dielectric constant of IGZO and wavelength.

[0119] The carrier concentration can be altered by the doping concentration to change the electron density, thereby affecting the dielectric constant. High doping indicates a high electron density, while low doping indicates a low electron density.

[0120] As shown in Figure 5, the increase in electron density leads to a decrease in dielectric constant, and the refractive index decreases as the dielectric constant decreases. In addition to the refractive index, the extinction coefficient also changes, thereby achieving dynamic tuning of structural colors.

[0121] Therefore, in the embodiments of this disclosure, the electron density of the first phase change material can be altered by doping, thereby adjusting the structural color that the second optical resonant cavity structure can transmit. Similarly, the electron density of the first phase change material can also be altered by methods such as plasma treatment, thereby adjusting the structural color that the second optical resonant cavity structure can transmit.

[0122] As can be seen from the above, the materials of the first reflective layer 51, the reflective layer 52, the second reflective layer 61, and the third reflective layer 63 can be the same, for example, they can all be Ag.

[0123] The material of the second light-transmitting layer 62 includes the first phase change material or the first phase change material treated with plasma, and the material of the first light-transmitting layer 52 includes the first phase change material treated with plasma.

[0124] For example, in one instance, the material of the second light-transmitting layer 62 includes a first phase change material, and the material of the first light-transmitting layer 52 includes a first phase change material treated with plasma. Specifically, the material of the second light-transmitting layer 62 includes IGZO, and the material of the first light-transmitting layer 52 includes IGZO treated with plasma.

[0125] In another example, both the first transparent layer 52 and the second transparent layer 62 are made of a first phase change material that has undergone plasma treatment. The plasma treatment intensity of the second transparent layer 62 and the first transparent layer 52 is different, resulting in different electron densities and dielectric constants.

[0126] In this embodiment of the present disclosure, the first phase change material enables the second optical resonant cavity structure to transmit light of a certain wavelength, and the thickness of the first phase change material is adjusted to ensure that different filter sections 6 can transmit different colors of light.

[0127] Furthermore, by using H2 plasma treatment, the resonant wavelength can be shifted, thereby adjusting the wavelength of the emitted colored light and improving the color purity of the filter section 6.

[0128] It should be noted that both the second light-transmitting layer 62 in the filter section 6 and the first light-transmitting layer 52 in the light-shielding section 5 can be treated with H2 plasma. However, since one needs to achieve the light-shielding function and the other needs to achieve the light-transmitting function, the intensity of the plasma treatment they receive is different.

[0129] Accordingly, the electron density and dielectric constant are different in the final second light-transmitting layer 62 and the first light-transmitting layer 51, thereby ensuring that the filter part 6 and the light-shielding part 5 can respectively realize their respective functions.

[0130] In summary, the filter unit 6 in this embodiment has higher transmittance and higher color saturation, and can obtain any color in the visible light band. It also has advantages such as low power consumption, high color gamut, UV insensitivity, and angle insensitivity.

[0131] Figure 6 is a schematic cross-sectional view of the filter section 6 in some embodiments of this disclosure.

[0132] In some embodiments, as shown in FIG6, the thickness d1 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63 are both 15-50 nm, and the thickness d2 of the second light-transmitting layer 62 is 100-300 nm.

[0133] For example, the thickness d1 of the second reflective layer 61 can be 15nm, 20nm, 25nm, 30nm, 35nm, 40nm, 45nm, or 50nm. The thickness d3 of the third reflective layer 63 can be 15nm, 20nm, 25nm, 30nm, 35nm, 40nm, 45nm, or 50nm.

[0134] The thickness d2 of the second light-transmitting layer 62 can be 100nm, 105nm, 110nm, 115nm, 120nm, 125nm, 130nm, 135nm, 140nm, 145nm, 150nm, 155nm, 160nm, 165nm, 170nm, 175nm, 180nm, 185nm, 190nm, 195nm, 200nm, 205nm, 210nm, 215nm, 220nm, 225nm, 230nm, 235nm, 240nm, 245nm, 250nm, 255nm, 260nm, 265nm, 270nm, 275nm, 280nm, 285nm, 290nm, 295nm, or 300nm.

[0135] Optionally, the thickness d2 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63 can be the same or different, and can be adjusted according to the different functions of the filter section 6. This disclosure does not limit this aspect.

[0136] In this embodiment, the thickness d1 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63 affect the transmission effect. For example, when both the second reflective layer 61 and the third reflective layer 63 are made of Ag, as the thickness d1 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63 increase, the transmitted spectrum of the second optical resonant structure exhibits a blue shift, and the full width at half maximum (FWHM) of the spectrum narrows. Therefore, in this embodiment, the thickness of the Ag metal mirror can be selected according to the color gamut and other requirements of the second optical resonant structure.

[0137] Meanwhile, in this embodiment of the present disclosure, the thickness d2 of the second light-transmitting layer 62 can be adjusted so that different second optical resonant structures can obtain structural colors such as blue light, red light, and green light.

[0138] Figure 7 is a cross-sectional structural diagram of the filter section 6 in some other embodiments of this disclosure.

[0139] In some embodiments, as shown in FIG7, the second light-transmitting layer 62 is multi-layered and stacked along the thickness direction of the display panel. The filter part 6 further includes a refractive layer 64 located between two adjacent second light-transmitting layers 62, wherein the refractive index of the refractive layer 64 is greater than the refractive index of the second light-transmitting layer 62.

[0140] In the second optical resonant cavity structure formed by the second reflective layer 61, the second light-transmitting layer 62, and the third reflective layer 63, light may undergo multiple resonances, affecting the emitted color of the second optical resonant cavity structure and causing the emitted color to deviate from the set color. To solve the aforementioned problem, the second light-transmitting layer 62 is configured as a multi-layer structure, and a refractive layer 64 is added between adjacent second light-transmitting layers 62. The refractive index of the refractive layer 64 is greater than that of the second light-transmitting layer 62, which can suppress multi-order resonances and increase the effective refractive index of the cavity medium, thereby greatly improving the purity of the generated structural color.

[0141] Specifically, a high-refractive-index refractive layer 64 is provided as a dielectric layer between adjacent second light-transmitting layers 62, which can provide phase compensation during light interference.

[0142] In some embodiments, as shown in FIG7, the thickness d4 of the refractive layer 64 is less than the thickness d21\d22 of any second light-transmitting layer 62.

[0143] Optionally, the thicknesses d21 and d22 of the second light-transmitting layer 62 in different layers can be the same or different, depending on the actual needs of the filter section 6.

[0144] In this embodiment, the thickness d4 of the refractive layer 64 is set to be relatively small, which can reduce the loss of light in the second optical resonant cavity structure, thereby improving the utilization rate of the light emitted by the light-emitting unit.

[0145] In some embodiments, the thickness d4 of the refractive layer 64 is 5 to 15 nm, for example, it can be 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm or 15 nm.

[0146] This embodiment of the present disclosure further reduces the loss of light in the second optical resonant cavity structure and improves the utilization rate of the light emitted by the light-emitting unit by setting a specific thickness d4 of the refractive layer 64.

[0147] In some embodiments, the material of the refractive layer 64 includes metallic germanium (Ge).

[0148] In this embodiment, Ge is selected as the material of the refractive layer 64. The Ge film, under ultra-thin conditions, can significantly reduce dielectric loss, thereby improving the utilization rate of the emitted light from the light-emitting unit. Compared to other all-dielectric materials such as Si, GaAs, and AlGaAs, Ge, as one of the materials with the highest refractive index in the visible light region, has higher extinction efficiency. Furthermore, the Ge film has low absorption loss, making it a lossless dielectric.

[0149] Therefore, the present embodiment can further improve the transmittance and color purity of the filter section 6 by setting the refractive layer 64, and reduce color crosstalk between the second optical resonant cavity structures that can transmit different colors.

[0150] Figure 8 is a cross-sectional structural diagram of the filter section 6 in some other embodiments of this disclosure.

[0151] In some embodiments, as shown in FIG8, the filter section 6 further includes: a first antireflective film 65 located between the second reflective layer 61 and the light-emitting unit, and a second antireflective film 66 located on the side of the third reflective layer 63 away from the substrate 1.

[0152] Specifically, as shown in Figure 3, the first antireflective film 65 is located between the second transflective layer 61 and the encapsulation layer 4, and the second antireflective film 66 is located between the third transflective layer 63 and the protective layer 7.

[0153] In this embodiment of the present disclosure, by providing a first antireflection film 65 and a second antireflection film 66, the resonant wavelength in the second optical resonant cavity structure can be further adjusted. For example, the resonance can be made to occur at a shorter wavelength, thereby further optimizing the color gamut of the emitted color light from the filter section 6.

[0154] Furthermore, the first antireflective film 65 and the second antireflective film 66 are located at opposite ends of the filter section 6 in its thickness direction. It can be understood that the positions of the first antireflective film 65 and the second antireflective layer are symmetrical about a first axis of symmetry, which is a straight line located between the second reflective layer 61 and the third reflective layer 63 and perpendicular to the thickness direction of the display panel.

[0155] In this embodiment, the resonant wavelength in the second optical resonant cavity structure is adjusted by using a symmetrical first antireflection film 65 and a second antireflection film 66, thereby ensuring the filtering effect of the filter section 6.

[0156] Specifically, the first antireflection film 65 can reduce the reflection loss of light on the surface of the second transflective layer 61 through the interference of light, thereby improving the light transmittance. The second antireflection film 66 can also reduce the reflection loss of light on the surface of the third transflective layer 63 through the interference of light, thereby improving the light transmittance.

[0157] Optionally, the materials of both the first antireflection membrane 65 and the second antireflection membrane 66 may include IGZO.

[0158] In some embodiments, the thickness d5 of the first antireflective film 65 and the thickness d6 of the second antireflective film 66 are both less than the total thickness d2 of the second light-transmitting layer 62, where d2 = d21 + d22.

[0159] In this embodiment of the disclosure, by setting the thickness d5 of the first antireflection film 65 and the thickness d6 of the second antireflection film 66 to be less than the total thickness d2 of the second light-transmitting layer 62, the effect of improving light transmittance can be guaranteed, while ensuring the overall thinness of the display panel.

[0160] In some embodiments, the thickness d5 of the first antireflective film 65 and the thickness d6 of the second antireflective film 66 are both 40-60 nm.

[0161] For example, the thickness d5 of the first antireflective coating 65 is 40 nm, 45 nm, 50 nm, 55 nm, or 60 nm. The thickness d6 of the second antireflective coating 66 is 40 nm, 45 nm, 50 nm, 55 nm, or 60 nm.

[0162] Furthermore, the transmittance of the entire filter section 6 can be improved by adjusting the thickness d5 of the first antireflection film 65 and the thickness d6 of the second antireflection film 66.

[0163] The thickness d5 of the first antireflective film 65 and the thickness d6 of the second antireflective film 66 may be the same or different, and this embodiment does not limit this.

[0164] The embodiments disclosed herein allow for adjustments to the thicknesses of the first antireflective film 65, the second antireflective film 66, the second reflective layer 61, the third reflective layer 63, and the second light-transmitting layer 62 within their respective ranges. This enables the second optical resonant cavity structure to form a dynamically tuned structure. In other words, the wavelength of the transmitted light from the second optical resonant cavity structure can be dynamically adjusted by adjusting the thickness of each of the aforementioned film layers, thereby ensuring the transmission color light function of the filter section 6, as well as the transmittance of the filter section and the color purity of the transmitted light.

[0165] For example, in some embodiments, the first antireflection film 65 and the second antireflection film 66 are both made of IGZO and have a thickness in the range of 40 to 60 nm; the second reflective layer 61 and the third reflective layer 63 are both made of Ag and have a thickness in the range of 20 to 40 nm; and the second light-transmitting layer 62 is made of IGZO and has a thickness (d2 or d21+d22) in the range of 100 to 300 nm.

[0166] Specifically, in one example, different second optical resonant cavity structures can transmit light with wavelengths of 693nm, 557nm and 472nm respectively, and the transmittance is 64.2%, 52.4% and 61.4% respectively. Obviously, the transmittance of the filter section 6 in the embodiment of this disclosure is significantly improved.

[0167] Therefore, the filter unit 6 in the present disclosure embodiment can further improve color purity and reduce power consumption.

[0168] In some embodiments, the cavity length of the second optical resonant cavity structure is the distance between the surface of the second reflective layer 61 facing the second light-transmitting layer 62 and the surface of the third reflective layer 63 facing the second light-transmitting layer 62.

[0169] For example, in the embodiment shown in Figure 6, only a second light-transmitting layer 62 is provided between the second reflective layer 61 and the third reflective layer 63. In this embodiment, the cavity length of the second optical resonant cavity structure is the thickness d2 of the second light-transmitting layer 62.

[0170] In the embodiments shown in Figures 7 and 8, multiple layers of second light-transmitting layers 62 and a refractive layer 64 located between two adjacent dielectric layers are provided between the second light-transmitting layer 61 and the third light-transmitting layer 63. In this embodiment, the cavity length of the second optical resonant cavity structure is the sum of the total thickness (d21+d22) of the second light-transmitting layer 62 and the thickness d4 of the refractive layer 64.

[0171] Figure 9 is a cross-sectional structural diagram of the display panel in some other embodiments of this disclosure.

[0172] In some embodiments, as shown in FIG9, the second transflective layer 61 is connected to the first transflective layer 51 as an integral structure, and / or the third transflective layer 63 is connected to the reflective layer 53 as an integral structure.

[0173] Specifically, in the embodiment shown in FIG9, the second transflective layer 61 is connected to the first transflective layer 51 as an integral structure, and the third transflective layer 63 is connected to the reflective layer 53 as an integral structure.

[0174] In this embodiment, the second reflective layer 61 and the first reflective layer 51 can be made of the same material and prepared using the same manufacturing process. That is, the second reflective layer 61 and the first reflective layer 51 can be formed simultaneously, thereby simplifying the process, reducing the difficulty of the manufacturing process, and lowering the manufacturing cost.

[0175] Similarly, the third transflective layer 63 and the reflective layer 53 can be made of the same material and prepared using the same process. That is, the third transflective layer 63 and the reflective layer 53 can be formed simultaneously, thereby simplifying the process, reducing the difficulty of the preparation process, and lowering the preparation cost.

[0176] This disclosure also provides a method for manufacturing a display panel, comprising:

[0177] Step S1: Provide substrate 1.

[0178] Step S2: A driving circuit layer 2, a light-emitting unit layer 3, and an encapsulation layer 4 are sequentially formed on one side of the substrate 1. The light-emitting unit layer 3 includes multiple light-emitting units.

[0179] Step S3: A light-shielding portion 5 and a light-filtering portion 6 are formed on the side of the encapsulation layer 4 away from the substrate 1. The light-shielding portion 5 has multiple light-transmitting openings, and the orthogonal projection of the light-emitting unit on the substrate 1 overlaps with the orthogonal projection of the light-emitting unit on the substrate 1. The light-shielding portion 5 includes, in sequence along the direction away from the substrate 1: a first transflective layer 51, a first light-transmitting layer 52, and a reflective layer 53. The first transflective layer 51, the first light-transmitting layer 52, and the reflective layer 53 form a first optical resonant cavity structure, which is used to block the emitted light from the light-emitting unit. At least a portion of the light-filtering portion 6 is located within the light-transmitting openings.

[0180] Figure 10 is a schematic diagram of the fabrication process of the light-shielding part 5 and the light-filtering part 6 in some embodiments of this disclosure.

[0181] In some embodiments, step S3, forming the light-shielding portion 5 and the light-filtering portion 6 on the side of the encapsulation layer 4 away from the substrate 1, includes:

[0182] Step S31, as shown in Figure 10(a), a first metal material layer 561 is formed on the side of the encapsulation layer 4 away from the substrate 1. The first metal material layer 561 includes a second transparent-reflective layer 61 and a first transparent-reflective layer 51 connected as an integral structure.

[0183] Step S32: As shown in Figure 10(b), a first light-transmitting material layer 520 is formed on the side of the first reflective layer 51 away from the substrate 1. The first light-transmitting material layer 520 has a plurality of first openings. The orthographic projection of the first opening on the substrate 1 overlaps with the orthographic projection of the light-emitting unit on the substrate 1. For example, the orthographic projection of the first opening on the substrate 1 covers the orthographic projection of the light-emitting unit on the substrate 1. In fact, the first opening is a part of the light-transmitting opening, and here "part" refers to a part in the thickness direction of the display panel.

[0184] Step S33, as shown in Figure 10(c), a second light-transmitting material layer 620 is formed within the first opening. The thickness of the second light-transmitting material layer 620 is different in at least two of the first openings.

[0185] Step S34: At least the first light-transmitting material layer 520 in the first light-transmitting material layer 520 and the second light-transmitting material layer 620 are subjected to plasma treatment to obtain the first light-transmitting layer 52 and the second light-transmitting layer 62.

[0186] Specifically, in one example, as shown in Figure 10(d), a mask 11 is used to block the second light-transmitting material layer 620, and the first light-transmitting material layer 520 is subjected to plasma treatment (the dashed line with arrows in the figure indicates plasma treatment) to obtain the first light-transmitting layer 52. In this example, if plasma treatment of the second light-transmitting material layer 620 is not required, then the second light-transmitting material layer 620 is the second light-transmitting layer 62. If plasma treatment of the second light-transmitting material layer 620 is required, another mask is used to block the first light-transmitting layer 52, and then plasma treatment is performed on the second light-transmitting material layer 620 to obtain the second light-transmitting layer 62.

[0187] When it is necessary to perform plasma treatment on the first light-transmitting material layer 520 and the second light-transmitting material layer 620 respectively, the order of treatment is not limited in this embodiment.

[0188] Step S35, as shown in (e) of FIG10, a second metal material layer 563 is formed on the side of the first light-transmitting layer 52 and the second light-transmitting layer 62 away from the substrate 1. The second metal material layer 563 includes a third transflective layer 63 and a reflective layer 53 connected as an integral structure.

[0189] The second reflective layer 61, the second light-transmitting layer 62 and the third reflective layer 63 constitute the light-filtering part 6, and the first reflective layer 51, the first light-transmitting layer 52 and the reflective layer 53 constitute the light-shielding part 5.

[0190] In this embodiment of the present disclosure, in steps S31, S32, S33 and S35, a metal vapor deposition process is used to achieve metal coating by ion implantation, thereby forming the coating in each step.

[0191] In step S33, the thickness of the second light-transmitting layer 62 in the second optical resonant cavity structure that transmits blue light, green light, and red light can be set, for example, by setting the thickness of IGZO.

[0192] In step S34, the light-shielding effect of the light-shielding part 5 can be achieved by H2 plasma treatment to improve contrast. The structural color that the filter part 5 can transmit can also be adjusted by H2 plasma treatment of different intensities.

[0193] The process flow in this embodiment is relatively simple, requires no additional equipment, and is highly operable.

[0194] In other embodiments, due to increasingly stringent VACS standards as customers demand better viewing angles, some display panels suffer from VACS defects, resulting in yield losses. Based on the display panel described in any one of the embodiments of this disclosure, this disclosure also provides a method for improving the VACS (View Angle Color Shift) yield of a display panel, including:

[0195] After the display panel packaging process is completed, optical measurements are performed on the display panel to predict the VACS (Vacuum-Active Sunlight) defect risk in advance. The display panels are then classified and graded, for example, based on customer standards to determine the risk level: no risk, low risk, medium risk, and high risk. Adjustments can be made accordingly for medium- and high-risk display panels. Specifically, medium- and high-risk display panels that do not meet the standard at the same angle can be centrally repaired. Therefore, the cause of the display panel defect can be determined based on the VACS and emission spectrum of the specific defective display panel, and a repair plan can be determined. Specifically, the emission spectrum can be fine-tuned by adjusting the thickness of the second reflective layer 61, the third reflective layer 63, and the second light-transmitting layer 62 in the second optical resonant cavity structure. Spectral fine-tuning can optimize the VACS, change the angle sensitivity, and turn VACS-defective display panels into good ones, reducing defect losses.

[0196] Figure 11A shows the transmission spectrum of the IGZO dynamically tuned structure in some embodiments of this disclosure, Figure 11B shows the transmission spectrum of the IGZO dynamically tuned structure in some embodiments of this disclosure, and Figure 11C shows the transmission spectrum of the IGZO dynamically tuned structure in some embodiments of this disclosure.

[0197] Specifically, Figure 11A shows the transmittance of the IGZO dynamic tuning structure in this embodiment of the present disclosure for light in the blue light band, Figure 11B shows the transmittance of the IGZO dynamic tuning structure in this embodiment of the present disclosure for light in the green light band, and Figure 11C shows the transmittance of the IGZO dynamic tuning structure in this embodiment of the present disclosure for light in the red light band.

[0198] As shown in Figures 11A, 11B, and 11C, in the IGZO dynamic tuning structure of this embodiment, the transmittance of the IGZO dynamic tuning structure changes with the change in the thickness d1 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63. From Figures 11A, 11B, and 11C, it can be seen that when d1 = d3 = 20 nm, the IGZO dynamic tuning structure of this embodiment has a higher transmittance for blue, green, and red light; when d1 = d3 = 40 nm, the IGZO dynamic tuning structure of this embodiment has a lower transmittance for blue, green, and red light. Therefore, the thickness d1 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63 in this embodiment are preferably 20 nm.

[0199] Similarly, embodiments of this disclosure can also dynamically adjust the thickness d2 of the second light-transmitting layer 62 (IGZO) to adjust the light transmittance of the IGZO dynamically tuned structure, thereby determining a thickness d2 that meets the requirements.

[0200] This disclosure also provides a display device, including a display panel as described in any embodiment of this disclosure.

[0201] The first and second optical resonant cavity structures designed in the embodiments of this disclosure can replace the color filter layer and the black matrix, respectively, to improve color purity, reduce power consumption, and simplify the process.

[0202] In this embodiment, the second optical resonant cavity structure uses structural color instead of chemical color, which improves reliability and avoids failure and performance degradation. Furthermore, the thickness of each film layer in the second optical resonant cavity structure can be adjusted in a timely manner according to product testing, thereby ensuring the product yield of the display panel.

[0203] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate substrate; a plurality of light emitting units on one side of the substrate substrate; a light shielding portion on the side of the plurality of light emitting units away from the substrate substrate, and a plurality of light transmission openings are formed in the light shielding portion, and the orthogonal projection of the light transmission openings on the substrate substrate overlaps with the orthogonal projection of the light emitting units on the substrate substrate; a plurality of light filtering portions, at least part of the light filtering portions being located in the light transmission openings; wherein the light shielding portion comprises, in sequence from the direction away from the substrate substrate: a first transmissive-reflection layer, a first light transmission layer, and a reflection layer, the first transmissive-reflection layer, the first light transmission layer, and the reflection layer form a first optical resonant cavity structure, and the first optical resonant cavity structure is used for shielding the outgoing light rays of the light emitting units.

2. The display panel of claim 1, wherein, The light filtering portion comprises, in sequence from the direction away from the substrate substrate: a second transmissive-reflection layer, a second light transmission layer, and a third transmissive-reflection layer, and the second transmissive-reflection layer, the second light transmission layer, and the third transmissive-reflection layer form a second optical resonant cavity structure, wherein the cavity lengths of at least two second optical resonant cavity structures are different, and the light rays of different cavity lengths of the second optical resonant cavity structures are different in color.

3. The display panel of claim 2, wherein, The material of the second transmissive-reflection layer and the material of the third transmissive-reflection layer both comprise at least one of Ag and Al.

4. The display panel of claim 2, wherein, The second light transmission layer is a plurality of layers and is stacked in the thickness direction of the display panel, the light filtering portion further comprises a refractive layer between any two adjacent second light transmission layers, and the refractive index of the refractive layer is greater than the refractive index of any one of the second light transmission layers.

5. The display panel of claim 4, wherein, The thickness of the refractive layer is less than the thickness of any one of the second light transmission layers.

6. The display panel of claim 4, wherein, The material of the refractive layer comprises germanium.

7. The display panel of claim 2, wherein, The light filtering portion further comprises a first anti-reflection film between the second transmissive-reflection layer and the substrate substrate, and a second anti-reflection film on the side of the third transmissive-reflection layer away from the substrate substrate.

8. The display panel of claim 7, wherein, The thickness of the first anti-reflection film and the second anti-reflection film is less than the thickness of the second light transmission layer.

9. The display panel of any of claims 2-8, wherein, The second transmissive-reflection layer and the first transmissive-reflection layer are connected as an integrated structure, and / or the third transmissive-reflection layer and the reflection layer are connected as an integrated structure.

10. The display panel of any one of claims 2-8, wherein, The material of the second light transmission layer comprises a first phase change material, and the material of the first light transmission layer comprises a first phase change material after plasma treatment. Alternatively, the material of the second light transmission layer and the material of the first light transmission layer both comprise a first phase change material after plasma treatment, the electron density of the second light transmission layer and the first light transmission layer is different, and the dielectric constant of the second light transmission layer and the first light transmission layer is different.

11. The display panel of claim 10, wherein, The first phase change material comprises a first compound, and the first compound comprises at least one of Ge2Sb2Te5 and VO2, or at least one of IGZO and WO3.

12. The display panel of any one of claims 1-9, wherein, The material of the first transmissive-reflection layer and the material of the reflection layer both comprise at least one of Ag and Al.

13. A method for manufacturing a display panel, characterized by, The display panel comprises: providing a substrate substrate; forming a plurality of light emitting units on one side of the substrate substrate; The light shielding part and the light filtering part are formed on a side of the light emitting unit away from the substrate, the light shielding part is provided with a plurality of light transmission openings, a normal projection of the light transmission openings on the substrate overlaps with a normal projection of the light emitting unit on the substrate, the light shielding part comprises, arranged in sequence in a direction away from the substrate: a first transmissive-reflection layer, a first light transmission layer, and a reflection layer, the first transmissive-reflection layer, the first light transmission layer, and the reflection layer form a first optical resonant cavity structure, the first optical resonant cavity structure is used for shielding outgoing light of the light emitting unit, and at least part of the light filtering part is located in the light transmission opening.

14. The method of manufacturing a display panel according to claim 13, wherein, The step of forming the light shielding part and the light filtering part on a side of the light emitting unit away from the substrate comprises: A second transmissive-reflection layer and a first transmissive-reflection layer connected as an integrated structure are formed on a side of the light emitting unit away from the substrate; A first light transmission material layer is formed on a side of the first transmissive-reflection layer away from the substrate, the first light transmission material layer is provided with a plurality of first openings, a normal projection of the first openings on the substrate overlaps with a normal projection of the light emitting unit on the substrate; A second light transmission material layer is formed in the first opening; At least the first light transmission material layer of the first light transmission material layer and the second light transmission material layer is subjected to plasma treatment to obtain a first light transmission layer and a second light transmission layer; A third transmissive-reflection layer and a reflection layer connected as an integrated structure are formed on a side of the first light transmission layer and the second light transmission layer away from the substrate; The second transmissive-reflection layer, the second light transmission layer, and the third transmissive-reflection layer constitute the light filtering part, and the first transmissive-reflection layer, the first light transmission layer, and the reflection layer constitute the light shielding part.

15. A display device comprising: The display panel comprises any one of claims 1 to 14. The display panel comprises any one of claims 1 to 14.

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