Display panel, preparation method thereof and display device

Abstract

The invention relates to a display panel, a preparation method thereof and a display device. The display panel comprises a substrate, a plurality of light emitting units, a shading part and a plurality of light filtering parts. Wherein the plurality of light-emitting units are positioned on one side of the substrate; the shading part is located on the sides, away from the substrate, of the multiple light-emitting units and provided with multiple light-transmitting openings, and the orthographic projection of the light-transmitting openings on the substrate overlaps the orthographic projection of the light-emitting units on the substrate. At least part of the light filtering part is located in the light-transmitting opening. Wherein the light shielding part comprises a first transflective layer, a first light transmitting layer and a reflecting layer which are sequentially arranged in the direction away from the substrate, the first transflective layer, the first light transmitting layer and the reflecting layer form a first optical resonant cavity structure, and the first optical resonant cavity structure is used for shielding emergent light of the light emitting unit. By using the first optical resonant cavity structure, a shading function can be realized, the contrast ratio is improved, and colored light crosstalk is avoided.

Description

Technical Field

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

[0002] The display panel generally includes a base substrate, a plurality of light-emitting units located on one side of the base substrate, and a shading portion and a plurality of filtering portions located on the side of the light-emitting unit away from the base substrate. The shading portion is provided with a plurality of light-transmitting openings, which are arranged opposite to the light-emitting unit, and the filtering portion is located in the light-transmitting opening. Among them, the plurality of filtering portions include filtering portions of different colors, and the filtering portion can transmit the light emitted by the light-emitting unit so that the emitted light is of the desired color. For example, the filtering portion includes a red filtering portion, and the light that can be transmitted by the red filtering portion is red light. The shading portion can block the light emitted by the light-emitting unit, and has the functions of preventing light leakage, avoiding color confusion, and improving contrast. Summary of the invention

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

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

[0005] substrate substrate;

[0006] A plurality of light emitting units are located on one side of the base substrate;

[0007] A light shielding portion is located at a side of the plurality of light-emitting units away from the base substrate and is provided with a plurality of light-transmitting openings, wherein the orthographic projections of the light-transmitting openings on the base substrate overlap with the orthographic projections of the light-emitting units on the base substrate;

[0008] A plurality of light filtering parts, at least part of which is located in the light-transmitting opening;

[0009] Among them, the shading portion includes: a first reflective layer, a first light-transmitting layer and a reflective layer, which are arranged in sequence along a direction away from the base substrate. The first reflective 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 used to block the outgoing light of the light-emitting unit.

[0010] In some embodiments, the filter portion includes a second reflective layer, a second light-transmitting layer, and a third reflective layer, which are sequentially arranged in a direction away from the base substrate, and the second reflective layer, the second light-transmitting layer, and the third reflective layer form a second optical resonant cavity structure, wherein at least two second optical resonant cavity structures have different cavity lengths, and the second optical resonant cavity structures with different cavity lengths can transmit light of different colors.

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

[0012] In some embodiments, the second light-transmitting layer is a multilayer layer stacked along the thickness direction of the display panel, and the filter portion further includes a refractive layer between two adjacent second light-transmitting layers, and the refractive index of the refractive layer is greater than the refractive index of any second light-transmitting layer.

[0013] In some embodiments, the thickness of the refractive layer is less than the thickness of any layer of the second light-transmitting layer.

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

[0015] In some embodiments, the filter section further includes: a first anti-reflection film located between the second reflective transmissive layer and the base substrate and a second anti-reflection film located on a side of the third reflective transmissive layer away from the base substrate.

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

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

[0018] In some embodiments, the material of the second light-transmitting layer includes a first phase-change material, and the material of the first light-transmitting layer includes a first phase-change material treated by plasma;

[0019] Alternatively, the material of the second light-transmitting layer and the material of the first light-transmitting layer both include a first phase-change material treated with plasma, the electron density of the second light-transmitting layer and the first light-transmitting layer are different, and the dielectric constant of the second light-transmitting layer and the first light-transmitting layer are different.

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

[0021] In some embodiments, the material of the first reflective transmission layer and the material of the reflective layer both include at least one of Ag and Al.

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

[0023] providing a substrate base plate;

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

[0025] A light shielding portion and a light filtering portion are formed on a side of the light emitting unit away from the base substrate, the light shielding portion is provided with a plurality of light-transmitting openings, the orthographic projection of the light-transmitting openings on the base substrate overlaps with the orthographic projection of the light emitting unit on the base substrate, 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 forming a first optical resonant cavity structure, the first optical resonant cavity structure being used to shield the outgoing light of the light emitting unit, and at least a portion of the light filtering portion is located in the light-transmitting opening.

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

[0027] A second reflective layer and a first reflective layer connected into an integral structure are formed on a side of the light emitting unit away from the base substrate;

[0028] A first light-transmitting material layer is formed on a side of the first reflective layer away from the base substrate, wherein the first light-transmitting material layer is provided with a plurality of first openings, and the orthographic projection of the first openings on the base substrate overlaps with the orthographic projection of the light-emitting unit on the base substrate;

[0029] forming a second light-transmitting material layer in the first opening;

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

[0031] A third reflective layer and a reflective layer connected to form an integrated structure are formed on the side of the first light-transmitting layer and the second light-transmitting layer away from the base substrate;

[0032] The second reflective layer, the second light-transmitting layer and the third reflective layer constitute the light filtering part, and the first reflective layer, the first light-transmitting layer and the reflective layer constitute the light-shielding part.

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

[0034] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

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

[0036] Figure 2 is a schematic diagram of the preparation process of the light shielding portion and the color film layer in some embodiments;

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

[0038] Figure 4A is the transmission spectrum of the first light-transmitting layer in the first optical resonant cavity structure before being treated by plasma;

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

[0040] Figure 5 This is the relationship between the real and imaginary parts of the dielectric constant of IGZO and the wavelength;

[0041] Figure 6 is a schematic diagram of the cross-sectional structure of the filter portion in some embodiments of the present disclosure;

[0042] Figure 7 is a schematic diagram of the cross-sectional structure of the filter portion in other embodiments of the present disclosure;

[0043] Figure 8 is a schematic diagram of the cross-sectional structure of the filter portion in 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 the preparation process of the light shielding part and the light filtering part in some embodiments of the present disclosure;

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

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

[0048] Fig. 11C Graph 1 is the light transmission spectrum of the IGZO dynamic tuning structure in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0049] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0051] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] As used herein, "parallel" and "perpendicular" include the described situation and the situation similar to the described situation, and the range of the similar situation is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°.

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

[0054] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0055] In the related art, a display device usually realizes a filtering function through a color filter part to realize color display, and at the same time, a light shielding part such as a black matrix (BM) is used to realize functions such as preventing light leakage, avoiding color confusion, and improving contrast.

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

[0057] Specifically, Figure 1 As shown, the existing display panel includes a base substrate 1, a driving circuit layer 2, a light-emitting unit layer 3, an encapsulation layer 4, a protective layer 7, a touch layer 8, an optical adhesive layer 9 and a cover layer 10 which are stacked in sequence. The display panel also includes a light shielding portion 5 and a color filter layer located between the encapsulation layer 4 and the protective layer 7.

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

[0059] The light shielding part 5 is provided with a plurality of light-transmitting openings, which are arranged opposite to the light-emitting units. The color filter layer includes a plurality of light-filtering parts 6, at least part of which is located in the light-transmitting openings, for filtering the light of the light-emitting units and transmitting light of a certain color.

[0060] The light emitting unit may emit white light or light of the same color as the light that can be transmitted by the filter unit 6 .

[0061] For example, the light emitting unit emits white light, and the filter section 6 includes a red filter section, a green filter section, and a blue filter section, wherein the red filter section can transmit red light, the green filter section can transmit green light, and the blue filter section can transmit blue light.

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

[0063] Figure 2 Schematic diagram of the preparation process of the light shielding portion 5 and the color filter layer in some embodiments.

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

[0065] Step S1: Figure 2 As shown in (a) of FIG. 1 , a light shielding material layer 50 is formed on a side of the encapsulation layer 4 away from the light emitting unit layer 3 (not shown in the figure).

[0066] Step S2: Figure 2 As shown in (b) of FIG. 1 , the light shielding material layer 50 is patterned to form a light shielding portion 5 having a plurality of light-transmitting openings.

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

[0068] Step S4: Figure 2 As shown in (d) of FIG. 5 , 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, that is, a blue filter portion.

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

[0070] Step S6: Figure 2 As shown in (f) of FIG. 5 , the second color filter material layer 620 is patterned to form a plurality of second color filter portions 602. The second color filter portions 602 may be, for example, filter portions 6 capable of transmitting green light, namely, green filter portions.

[0071] Step S7: Figure 2 As shown in (g) in FIG. 8 , a third color filter material layer 630 is formed on a side of the light shielding portion 5 away from the encapsulation layer 4 .

[0072] Step S8: Figure 2As shown in (h) in FIG. 5 , the third color filter material layer 630 is patterned to form a plurality of third color filter portions 603. The third color filter portion 603 may be, for example, a filter portion 6 capable of transmitting red light, that is, a red filter portion.

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

[0074] As can be seen from the above, the preparation of the light shielding portion 5 and the color filter layer requires patterning the light shielding material layer 50 and the filter material layer 60 respectively, and the process flow is relatively complicated and has a low error tolerance.

[0075] In addition, during long-term use, the optical performance of the filter 6 will significantly decline due to the accumulation of use time and environmental factors such as ultraviolet radiation, and the reliability will be poor, affecting the color display of the display device. In addition, the filter 6 may also have the problem of being not firmly cured and easily falling off.

[0076] The main components of the black matrix generally include carbon black, dispersant, alkali-soluble resin (Polymer), monomer, photoinitiator, additive and other materials. The main preparation process of forming a patterned black matrix includes the coating, exposure, development, post-baking and other processes of the above-mentioned various materials. During the exposure process, a part of the coated black matrix material is exposed to ultraviolet light, and the photoinitiator therein is activated, inducing a cross-linking polymerization reaction of the monomer to solidify this part of the black matrix material, and then after the development stage, the alkaline developer dissolves the uncured part of the black matrix material to form a pattern, that is, to obtain the light-shielding portion 5.

[0077] Since the main material of the existing black matrix contains carbon black, which reflects light, the black matrix will have a higher reflectivity. In addition, due to the presence of carbon black, during the exposure process when the black matrix is ​​made, the carbon black will reflect the ultraviolet light irradiating the black matrix material, reducing the amount of ultraviolet light available for the monomer to absorb, prolonging the curing time and reducing the curing efficiency.

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

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

[0080] In some embodiments, Figure 3As shown, a display panel disclosed in the present invention includes: a base substrate 1, a light-emitting unit layer 3 located on one side of the base substrate 1, and a light-shielding portion 5 and a color filter layer located on a side of the light-emitting unit layer 3 away from the base 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 portion 5 is provided with a plurality of light-transmitting openings, and the orthographic projections of the light-transmitting openings on the base substrate 1 overlap with the orthographic projections of the light-emitting units on the base substrate 1, for example, the orthographic projections of the light-transmitting openings on the base substrate 1 cover the orthographic projections of the light-emitting units on the base substrate 1. At least a portion of the filter portion 6 is located in the light-transmitting openings.

[0082] Among them, the shading portion 5 includes: a first transflective layer 51, a first light-transmitting layer 52 and a reflective layer 53, which are arranged in sequence along a direction away from the base 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, and the first optical resonant cavity structure is used to block the outgoing light of the light-emitting unit.

[0083] In the embodiment of the present disclosure, the first optical resonant cavity structure formed by the first reflective layer 51, the first light-transmitting layer 52 and the reflective layer 53 can absorb the light emitted by the light-emitting unit. Therefore, after the light emitted by the light-emitting unit passes through the first optical resonant cavity structure, the transmittance is very low. For example, the transmittance is only about 5%. Therefore, the embodiment of the present disclosure can block the light emitted by the light-emitting unit through the first optical resonant cavity structure, thereby realizing the shading function.

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

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

[0086] For example, the material of the first transflective layer 51 and the material of the reflective layer 53 are both Ag, forming an Ag metal mirror, and the transflective effect of the first transflective 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 been subjected to plasma treatment.

[0088] In the disclosed embodiment, the first phase change material (PCM) can adjust the wavelength of light that can be transmitted by 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 resonance wavelength of light in the first optical resonance cavity structure, thereby reducing the light transmitted by the first optical resonance structure, thereby achieving light shielding by the first optical resonance structure.

[0090] Figure 4A is the transmission spectrum of the first light-transmitting layer 52 in the first optical resonant cavity structure before being treated by H2 plasma, Figure 4B is the transmission spectrum of the first light-transmitting layer 52 in the first optical resonant cavity structure after being treated by H2 plasma.

[0091] like Figure 4A As shown, 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] like Figure 4B As shown, for the first optical resonant cavity structure in which the first light-transmitting layer 52 has been treated with H2 plasma, the transmittance of the first optical resonant cavity structure with different cavity lengths to blue light, green light and red light is very low.

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

[0094] In some embodiments, the first phase change material includes a first compound, the first compound includes at least one of Ge2Sb2Te5 (germanium antimony telluride) and VO2 (vanadium dioxide), or includes at least one of IGZO (Indium Gallium Zinc Oxide) and WO3 (tungsten trioxide).

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

[0096] In the example where the first compound includes IGZO and / or WO3, the wavelength of light that can pass through the first optical resonant cavity structure can be adjusted by adjusting 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 shielding.

[0097] In some embodiments, Figure 3 As shown, the filter part 6 includes a second reflective layer 61, a second light-transmitting layer 62 and a third reflective layer 63 which are sequentially arranged in a direction away from the base substrate 1, and the second reflective layer 61, the second light-transmitting layer 62 and the third reflective layer 63 form a second optical resonant cavity structure, wherein at least two second optical resonant cavity structures have different cavity lengths, and the second optical resonant cavity structures with different cavity lengths transmit light of different colors.

[0098] Color originates from the interaction between light and matter in nature, and is divided into chemical color and physical color (structural color). The most common chemical colors are pigments and dyes, which produce different colors in the visible light range by absorbing the characteristics of specific light, but chemical colors usually have low color vividness, small color gamut area, and low spatial resolution. The color filter layer in the prior art is generally formed using color-resisting materials and belongs to chemical color. Therefore, the color filter layer is easily exposed to long-term ultraviolet rays, resulting in a significant decrease in optical performance.

[0099] Structural colors refer to various colors produced by the refraction, diffuse reflection, diffraction or interference of light waves due to the special ordered structure of material molecules. Compared with chemical colors, they have the characteristics of high color reflectivity, high saturation, not easy to fade, and environmental protection. The embodiment of the present disclosure uses the second optical resonant cavity structure to realize color display using chemical colors.

[0100] Specifically, in the embodiment of the present disclosure, structural color can be achieved through the second optical resonant cavity structure, that is, the color 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 improving the utilization rate of the light. At the same time, the embodiment of the present disclosure can further adjust the color of the transmitted color light by adjusting the cavity length of the second optical resonant cavity structure.

[0101] For example, in one example, the cavity length of the second optical resonant cavity structure is 170nm, and the light emitted by the light emitting unit resonates in the second optical resonant cavity after being incident on the second optical resonant cavity, and the resonant wavelength is 438nm, that is, at this time, the light with a wavelength near 438nm can be transmitted through the second optical resonant cavity and emitted, that is, this second optical resonant cavity structure can transmit blue light. Further, in an example in which the light emitting unit emits blue light, the transmittance of the blue light can reach greater than or equal to 60%, while the transmittance of the blue filter portion 6 in the color film layer is only about 42%. Therefore, the second optical resonant cavity structure of the embodiment of the present disclosure can improve the transmittance of blue light.

[0102] In another example, the cavity length of the second optical resonant cavity structure is 90nm, and the light emitted by the light-emitting unit resonates in the second optical resonant cavity after being incident on the second optical resonant cavity, and the resonant wavelength is 550nm, that is, at this time, the light with a wavelength near 550nm can be transmitted through the second optical resonant cavity and emitted, that is, this second optical resonant cavity structure can transmit green light. Further, in an example in which the light-emitting unit emits green light, the transmittance of green light can reach greater than or equal to 56%. Compared with the transmittance of the green filter part 6 in the color film layer of only about 50%, the second optical resonant cavity structure of the embodiment of the present disclosure can improve the transmittance of green light.

[0103] In another example, the cavity length of the second optical resonant cavity structure is 125nm, and the light emitted by the light-emitting unit resonates in the second optical resonant cavity after entering the second optical resonant cavity, and the resonant wavelength is 676nm, that is, at this time, the light with a wavelength near 676nm can be transmitted through the second optical resonant cavity and emitted, that is, this second optical resonant cavity structure can transmit red light. Further, in an example in which the light-emitting unit emits red light, the transmittance of red light can reach greater than or equal to 50%. Compared with the transmittance of the red filter part 6 in the color film layer of only about 50%, the second optical resonant cavity structure of the embodiment of the present disclosure can improve the transmittance of red light.

[0104] Therefore, in the embodiment of the present disclosure, different second optical resonant cavity structures may be provided with different cavity lengths, so that the second optical resonant cavity structures emit different colored lights, 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 through a second optical resonant cavity structure with different cavity lengths to emit blue light, red light, green light and other colored lights respectively.

[0106] In another example, the plurality of light emitting units include a plurality of light emitting units emitting blue light, a plurality of light emitting units emitting red light, and a plurality of light emitting 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 unit.

[0107] Specifically, the cavity length of the second optical resonant cavity structure corresponding to the light emitting unit emitting blue light is adjusted so that the second optical resonant cavity structure can transmit blue light of a certain wavelength, so as to filter 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 emitting red light is adjusted so that the second optical resonant cavity structure can transmit red light of a certain wavelength, so as to filter 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 emitting green light is adjusted so that the second optical resonant cavity structure can transmit green light of a certain wavelength, so as to filter the green light emitted by the light emitting unit.

[0110] In the embodiment of the present disclosure, the second optical resonant cavity structure can further filter the color light emitted by the light emitting unit, so that the color saturation of the transmitted color light is higher. In addition, compared with the color filter layer in the prior art, the color light transmittance of the second optical resonant cavity structure in the embodiment of the present disclosure is higher.

[0111] In fact, the second optical resonant cavity structure in the embodiment of the present disclosure can obtain light of any color in the visible light band, and has the advantages of low power consumption, high color gamut, UV 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 may be, for example, a FP resonant structure. The second reflective layer 61 and the third reflective layer 63 constitute two parallel plane reflectors.

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

[0114] In the embodiment of the present disclosure, Ag is selected as the metal mirror, and the high reflectivity and low absorptivity of Ag can be used to improve the transmittance of the filter part 6 to the light emitted by the light-emitting unit.

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

[0116] In the disclosed embodiment, the first phase change material can adjust the wavelength of light that can be transmitted by the first optical resonant cavity structure by adjusting conditions such as temperature, voltage or carrier concentration, and further realize the transmission function of different colors of light in combination with the cavity length of the first optical resonant cavity structure.

[0117] The second light-transmitting layer 62 formed by the first phase-change material in the embodiment of the present disclosure can realize dynamic tuning of structural color. In a specific example, the second light-transmitting layer 62 formed by IGZO can not only produce high-purity transmission color, but also its carrier concentration can be adjusted by doping, H2 plasma treatment (H + +O 2- =OH - Therefore, the material of the second light-transmitting layer 62 may also include the first phase-change material treated by plasma.

[0118] Figure 5 This is a graph showing the relationship between the real and imaginary parts of the dielectric constant of IGZO and the wavelength.

[0119] The carrier concentration can change the electron density through the doping concentration, thereby affecting the dielectric constant, where high doping means a large electron density and low doping means a small electron density.

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

[0121] Therefore, the disclosed embodiment can change the electron density of the first phase change material 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 changed by plasma treatment or other methods, thereby adjusting the structural color that the second optical resonant cavity structure can transmit.

[0122] It can be seen from the above that the materials of the first transflective layer 51 , the reflective layer 52 , the second transflective layer 61 and the third transflective layer 63 can be the same, for example, 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 by plasma, and the material of the first light-transmitting layer 52 includes the first phase-change material treated by plasma.

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

[0125] In another example, the materials of the first light-transmitting layer 52 and the second light-transmitting layer 62 both include the first phase-change material that has been subjected to plasma treatment. The plasma treatment intensities of the material of the second light-transmitting layer 62 and the material of the first light-transmitting layer 52 are different, and the electron density and dielectric constant of the second light-transmitting layer 62 and the first light-transmitting layer 52 are different.

[0126] In the disclosed embodiment, the first phase change material can enable the second optical resonant cavity structure to transmit light of a certain wavelength, and different filter parts 6 can transmit light of different colors by adjusting the thickness of the first phase change material.

[0127] Furthermore, through H2 plasma treatment, the resonance wavelength can be shifted, thereby adjusting the wavelength of the emitted color light and improving the color purity of the filter part 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 shading section 5 can be subjected to H2 plasma treatment. However, since one needs to realize the shading function and the other needs to realize the light-transmitting function, the intensity of the plasma treatment they receive is different.

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

[0130] In summary, the filter part 6 in the embodiment of the present disclosure has higher transmittance and higher color saturation, and can obtain any color in the visible light band. It has the advantages of low power consumption, high color gamut, UV insensitivity and angle insensitivity.

[0131] Figure 6 Schematic diagram of the cross-sectional structure of the filter unit 6 in some embodiments of the present disclosure.

[0132] In some embodiments, Figure 6 As shown, the thickness d1 of the second reflective transmissive layer 61 and the thickness d3 of the third reflective transmissive 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 transflective layer 61 may be 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm or 50 nm. The thickness d3 of the third transflective layer 63 may be 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm or 50 nm.

[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 transmissive layer 61 and the thickness d3 of the third reflective transmissive layer 63 may be the same or different, and may be adjusted according to the functions of different filter parts 6. This embodiment of the present disclosure is not limited to this.

[0136] In the embodiment of the present disclosure, the thickness d1 of the second transflective layer 61 and the thickness d3 of the third transflective layer 63 will affect the transmission effect. For example, when the materials of the second transflective layer 61 and the third transflective layer 63 are both Ag, as the thickness d1 of the second transflective layer 61 and the thickness d3 of the third transflective layer 63 increase, the spectrum transmitted by the second optical resonance structure blue shifts and the spectrum half-peak width narrows. Therefore, in the embodiment of the present disclosure, the thickness of the Ag metal mirror can be selected according to the requirements of the color range of the color light that the second optical resonance structure needs to transmit.

[0137] Meanwhile, in the embodiment of the present disclosure, different second optical resonance structures can obtain structural colors of different colors such as blue light, red light, green light, etc. by adjusting the thickness d2 of the second light-transmitting layer 62 .

[0138] Figure 7 Schematic diagram of the cross-sectional structure of the filter unit 6 in other embodiments of the present disclosure.

[0139] In some embodiments, Figure 7 As shown, the second light-transmitting layer 62 is multi-layered and stacked along the thickness direction of the display panel. The filter unit 6 also 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 transflective layer 61, the second light-transmitting layer 62 and the third transflective layer 63, the light may resonate multiple times, which will affect the color light effect of the second optical resonant cavity structure, causing the emitted color light to deviate from the set color. In order to solve the above problem, the second light-transmitting layer 62 is set to be multi-layered, 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 the refractive index of the second light-transmitting layer 62, which can suppress multi-order resonance, and the effective refractive index of the cavity medium will increase, which can greatly improve the purity of the generated structural color.

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

[0142] In some embodiments, Figure 7 As shown, the thickness d4 of the refractive layer 64 is less than the thickness d21\d22 of any layer of the second light-transmitting layer 62 .

[0143] Optionally, the thicknesses d21 and d22 of different layers of the second light-transmitting layer 62 may be the same or different, and are set according to actual requirements of the filter unit 6 .

[0144] In the embodiment of the present disclosure, 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 5-15 nm, for example, 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm or 15 nm.

[0146] The embodiment of the present disclosure further reduces the loss of light in the second optical resonant cavity structure by setting the specific thickness d4 of the refractive layer 64, thereby improving the utilization rate of the light emitted by the light emitting unit.

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

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

[0149] Therefore, the embodiment of the present disclosure can further improve the light transmittance and color purity of the filter portion 6 by providing the refractive layer 64 , and reduce the color crosstalk between the second optical resonant cavity structures capable of transmitting different colors.

[0150] Figure 8 Schematic diagram of the cross-sectional structure of the filter unit 6 in other embodiments of the present disclosure.

[0151] In some embodiments, Figure 8 As shown, the filter unit 6 further includes: a first anti-reflection film 65 located between the second transflective layer 61 and the light-emitting unit, and a second anti-reflection film 66 located on a side of the third transflective layer 63 away from the base substrate 1 .

[0152] Specifically, combined Figure 3 It can be seen that the first anti-reflection film 65 is located between the second transflective layer 61 and the encapsulation layer 4 , and the second anti-reflection film 66 is located between the third transflective layer 63 and the protective layer 7 .

[0153] In the disclosed embodiment, the first anti-reflection film 65 and the second anti-reflection film 66 can be provided to further adjust the resonance wavelength in the second optical resonant cavity structure, for example, the resonance can be made to occur at a shorter wavelength, thereby further optimizing the color gamut of the color light emitted by the filter unit 6 .

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

[0155] In the embodiment of the present disclosure, the resonance wavelength in the second optical resonant cavity structure is adjusted by the symmetrical first anti-reflection film 65 and the second anti-reflection film 66 , thereby ensuring the filtering effect of the filter part 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 phenomenon of light, thereby improving the light transmittance. The second antireflection film 66 can reduce the reflection loss of light on the surface of the third transflective layer 63 through the interference phenomenon of light, thereby improving the light transmittance.

[0157] Optionally, the materials of the first anti-reflection film 65 and the second anti-reflection film 66 may both include IGZO.

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

[0159] In the disclosed embodiment, by setting the thickness d5 of the first anti-reflection film 65 and the thickness d6 of the second anti-reflection film 66 to be smaller than the total thickness d2 of the second light-transmitting layer 62, the light transmittance can be improved while ensuring the overall thinness of the display panel.

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

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

[0162] Furthermore, the embodiment of the present disclosure can improve the light transmittance of the entire filter portion 6 by adjusting the thickness d5 of the first anti-reflection film 65 and the thickness d6 of the second anti-reflection film 66 .

[0163] The thickness d5 of the first anti-reflection film 65 and the thickness d6 of the second anti-reflection film 66 may be the same or different, and the embodiment of the present disclosure is not limited thereto.

[0164] The disclosed embodiment can adjust the thickness of the first anti-reflection film 65, the second anti-reflection film 66, the second transflective layer 61, the third transflective layer 63 and the second light-transmitting layer 62 within their respective ranges, so that the second optical resonant cavity structure can form a dynamic tuning structure, that is, the wavelength of the light transmitted by the second optical resonant cavity structure can be dynamically adjusted by the thickness of the above-mentioned film layers, thereby ensuring the color light transmission function of the filter part 6, as well as the transmittance of the filter part and the color purity of the transmitted light.

[0165] For example, in some embodiments, the material of the first anti-reflection film 65 and the second anti-reflection film 66 are both IGZO, and the thickness is in the range of 40 to 60 nm. The material of the second transflective layer 61 and the third transflective layer 63 are both Ag, and the thickness is in the range of 20 to 40 nm. The material of the second light-transmitting layer 62 is IGZO, and the thickness (d2 or d21+d22) is 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 transmittances are 64.2%, 52.4% and 61.4%, respectively. Obviously, the transmittance of the filter part 6 in the embodiment of the present disclosure is significantly improved.

[0167] Therefore, the filter unit 6 of the embodiment of the present disclosure 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 Figure 6 In the illustrated embodiment, only the second light-transmitting layer 62 is disposed between the second light-transmitting layer 61 and the third light-transmitting layer 63 . The cavity length of the second optical resonant cavity structure in this embodiment is the thickness d2 of the second light-transmitting layer 62 .

[0170] exist Figure 7 and Figure 8 In the illustrated embodiment, a plurality 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] Fig. 9 It is a schematic diagram of the cross-sectional structure of the display panel in some other embodiments of the present disclosure.

[0172] In some embodiments, Fig. 9As shown, the second reflective transmissive layer 61 is connected to the first reflective transmissive layer 51 as an integral structure, and / or the third reflective transmissive layer 63 is connected to the reflective layer 53 as an integral structure.

[0173] Specifically, in Fig. 9 In the illustrated embodiment, 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 the embodiment of the present disclosure, the second reflective layer 61 and the first reflective layer 51 can be made of the same material and prepared using the same preparation process, that is, the second reflective layer 61 and the first reflective layer 51 can be formed at the same time, thereby simplifying the process, reducing the difficulty of the preparation process, and reducing the preparation cost.

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

[0176] The present disclosure also provides a method for preparing a display panel, comprising:

[0177] Step S1, providing a base substrate 1.

[0178] Step S2: forming a driving circuit layer 2, a light-emitting unit layer 3 and a packaging layer 4 in sequence on one side of the base substrate 1. The light-emitting unit layer 3 includes a plurality of light-emitting units.

[0179] Step S3, forming a light shielding portion 5 and a light filter portion 6 on the side of the encapsulation layer 4 away from the base substrate 1, wherein the light shielding portion 5 is provided with a plurality of light-transmitting openings, and the orthographic projection of the light-transmitting openings on the base substrate 1 overlaps with the orthographic projection of the light-emitting unit on the base substrate 1, and the light shielding portion 5 includes: a first transflective layer 51, a first light-transmitting layer 52 and a reflective layer 53 arranged in sequence in a direction away from the base substrate 1, the first transflective layer 51, the first light-transmitting layer 52 and the reflective layer 53 forming a first optical resonant cavity structure, and the first optical resonant cavity structure is used to block the outgoing light of the light-emitting unit. At least part of the light filter portion 6 is located in the light-transmitting opening.

[0180] Fig.10 It is a schematic diagram of the preparation process of the shading part 5 and the filtering part 6 in some embodiments of the present disclosure.

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

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

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

[0184] Step S33: Fig.10 As shown in (c) of FIG. 1 , a second light-transmitting material layer 620 is formed in the first opening. The thickness of the second light-transmitting material layer 620 in at least two first openings is different.

[0185] Step S34 , performing plasma treatment on at least the first light-transmitting material layer 520 of the first light-transmitting material layer 520 and the second light-transmitting material layer 620 to obtain the first light-transmitting layer 52 and the second light-transmitting layer 62 .

[0186] Specifically, in one example, Fig.10 As shown in (d) in FIG. 1 , the second light-transmitting material layer 620 is shielded by using a mask 11, and the first light-transmitting material layer 520 is subjected to plasma treatment (the dotted line with an arrow in the figure indicates plasma treatment), thereby obtaining the first light-transmitting layer 52. In this example, if the second light-transmitting material layer 620 does not need to be subjected to plasma treatment, the second light-transmitting material layer 620 is the second light-transmitting layer 62. If the second light-transmitting material layer 620 needs to be subjected to plasma treatment, another mask is used to shield the first light-transmitting layer 52, and then the second light-transmitting material layer 620 is subjected to plasma treatment to obtain the second light-transmitting layer 62.

[0187] When the first light-transmitting material layer 520 and the second light-transmitting material layer 620 need to be subjected to plasma treatment respectively, the order of the treatment is not limited in the embodiment of the present disclosure.

[0188] Step S35: Fig.10 As shown in (e), 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 base substrate 1. The second metal material layer 563 includes a third reflective layer 63 and a reflective layer 53 connected as an integrated structure.

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

[0190] In the embodiment of the present disclosure, in step S31, step S32, step S33 and step S35, a metal vapor deposition process is used to achieve metal plating through ion implantation to form the coating film 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 to be, for example, IGZO.

[0192] In step S34, the light shielding function of the light shielding part 5 can be realized by H2 plasma treatment to improve the 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 the embodiment of the present disclosure is relatively simple, does not require additional equipment, and is highly operable.

[0194] In other embodiments, as customers are constantly demanding better viewing angle display effects, VACS standards are becoming increasingly stringent, resulting in poor VACS performance in some display panels and yield loss. Based on the display panel described in any one of the embodiments of the present disclosure, the present 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, the display panel is optically measured to estimate the VACS defect risk of the display panel in advance and classify the display panel. For example, the risk level can be determined according to customer standards: no risk, low risk, medium risk, high risk, among which corresponding adjustments can be made to the display panels with medium risk and high risk. Specifically, the display panels with medium and high risks that do not meet the standards at the same angle can be repaired in a centralized manner. Therefore, the cause of the display panel failure can be determined based on the VACS and emission spectrum of the specific defective display panel, and the repair plan can be determined. Specifically, the light emission spectrum can be fine-tuned by fine-tuning 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. The spectrum fine-tuning can optimize VACS, change the angle sensitivity, and achieve the transformation of display panels with poor VACS to good ones, reducing defective losses.

[0196] Fig.11A is the light transmission spectrum of the IGZO dynamic tuning structure in some embodiments of the present disclosure, Fig. 11B is the light transmission spectrum of the IGZO dynamic tuning structure in some embodiments of the present disclosure, Fig. 11C Graph 1 is the light transmission spectrum of the IGZO dynamic tuning structure in some embodiments of the present disclosure.

[0197] Specifically, Fig.11A is the transmittance of the IGZO dynamic tuning structure in the embodiment of the present disclosure to light in the blue light band, Fig. 11B is the transmittance of the IGZO dynamic tuning structure in the embodiment of the present disclosure to light in the green light band, Fig. 11C It is the transmittance of the IGZO dynamic tuning structure in the embodiment of the present disclosure to light in the red light band.

[0198] like Fig.11A , Fig. 11B and Fig. 11C As shown, in the IGZO dynamic tuning structure in the embodiment of the present disclosure, as the thickness d1 of the second transflective layer 61 and the thickness d3 of the third transflective layer 63 change, the transmittance of the IGZO dynamic tuning structure also changes accordingly, and changes from Fig.11A , Fig. 11B and Fig. 11C It can be seen that when d1=d3=20nm, the transmittance of the IGZO dynamic tuning structure in the embodiment of the present disclosure to blue light, green light and red light is relatively large, and when d1=d3=40nm, the transmittance of the IGZO dynamic tuning structure in the embodiment of the present disclosure to blue light, green light and red light is relatively small. Therefore, the thickness d1 of the second reflective layer 61 and the thickness d3 of the third reflective layer 63 in the embodiment of the present disclosure are preferably 20nm.

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

[0200] The present disclosure also provides a display device, comprising a display panel as described in any embodiment of the present disclosure.

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

[0202] The second optical resonant cavity structure in the embodiment of the present disclosure uses structural color instead of chemical color, which can improve reliability and avoid failure and performance degradation. In addition, the thickness of each film layer of the second optical resonant cavity structure in the embodiment of the present disclosure can be adjusted in time according to the product test structure, thereby ensuring the product yield of the display panel.

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

Claims

1. A display panel, characterized in that: include: substrate substrate; A plurality of light emitting units are located on one side of the base substrate; A light shielding portion is located at a side of the plurality of light-emitting units away from the base substrate and is provided with a plurality of light-transmitting openings, wherein the orthographic projections of the light-transmitting openings on the base substrate overlap with the orthographic projections of the light-emitting units on the base substrate; A plurality of light filtering parts, at least part of which is located in the light-transmitting opening; Among them, the shading portion includes: a first reflective layer, a first light-transmitting layer and a reflective layer, which are arranged in sequence along a direction away from the base substrate. The first reflective 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 used to block the outgoing light of the light-emitting unit.

2. The display panel according to claim 1, characterized in that: The filter section includes a second reflective layer, a second light-transmitting layer and a third reflective layer, which are sequentially arranged in a direction away from the base substrate, and the second reflective layer, the second light-transmitting layer and the third reflective layer form a second optical resonant cavity structure, wherein at least two second optical resonant cavity structures have different cavity lengths, and the second optical resonant cavity structures with different cavity lengths can transmit light of different colors.

3. The display panel according to claim 2, characterized in that: The material of the second reflective transmission layer and the material of the third reflective transmission layer both include at least one of Ag and Al.

4. The display panel according to claim 2, characterized in that: The second light-transmitting layer is a multilayer layer stacked along the thickness direction of the display panel. The filter portion further includes a refractive layer between two adjacent second light-transmitting layers. The refractive index of the refractive layer is greater than the refractive index of any second light-transmitting layer.

5. The display panel according to claim 4, characterized in that: The thickness of the refractive layer is smaller than the thickness of any layer of the second light-transmitting layer.

6. The display panel according to claim 4, characterized in that: The material of the refractive layer includes germanium.

7. The display panel according to claim 2, characterized in that: The filter unit further includes: a first anti-reflection film located between the second reflective transmissive layer and the base substrate, and a second anti-reflection film located on a side of the third reflective transmissive layer away from the base substrate.

8. The display panel according to claim 7, characterized in that: The thickness of the first anti-reflection film and the second anti-reflection film are both smaller than the thickness of the second light-transmitting layer.

9. The display panel according to any one of claims 2 to 8, characterized in that: The second reflective transmissive layer and the first reflective transmissive layer are connected to form an integral structure, and / or the third reflective transmissive layer and the reflective layer are connected to form an integral structure.

10. The display panel according to any one of claims 2 to 8, characterized in that: The material of the second light-transmitting layer includes a first phase-change material, and the material of the first light-transmitting layer includes a first phase-change material treated by plasma; Alternatively, the material of the second light-transmitting layer and the material of the first light-transmitting layer both include a first phase-change material treated with plasma, the electron density of the second light-transmitting layer and the first light-transmitting layer are different, and the dielectric constant of the second light-transmitting layer and the first light-transmitting layer are different.

11. The display panel according to claim 10, characterized in that: The first phase change material includes a first compound, and the first compound includes at least one of Ge2Sb2Te5 and VO2, or includes at least one of IGZO and WO3.

12. The display panel according to any one of claims 1 to 9, characterized in that: The material of the first reflective transmission layer and the material of the reflective layer both include at least one of Ag and Al.

13. A method for preparing a display panel, characterized in that: include: providing a substrate base plate; forming a plurality of light emitting units on one side of the base substrate; A light shielding portion and a light filtering portion are formed on a side of the light emitting unit away from the base substrate, the light shielding portion is provided with a plurality of light-transmitting openings, the orthographic projection of the light-transmitting openings on the base substrate overlaps with the orthographic projection of the light emitting unit on the base substrate, 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 forming a first optical resonant cavity structure, the first optical resonant cavity structure being used to shield the outgoing light of the light emitting unit, and at least a portion of the light filtering portion is located in the light-transmitting opening.

14. The method for manufacturing a display panel according to claim 13, characterized in that: The step of forming a light shielding portion and a light filtering portion on a side of the light emitting unit away from the base substrate comprises: A second reflective layer and a first reflective layer connected into an integral structure are formed on a side of the light emitting unit away from the base substrate; A first light-transmitting material layer is formed on a side of the first reflective layer away from the base substrate, wherein the first light-transmitting material layer is provided with a plurality of first openings, and the orthographic projection of the first openings on the base substrate overlaps with the orthographic projection of the light-emitting unit on the base substrate; forming a second light-transmitting material layer in the first opening; Performing plasma treatment on at least the first light-transmitting material layer of the first light-transmitting material layer and the second light-transmitting material layer to obtain a first light-transmitting layer and a second light-transmitting layer; A third reflective layer and a reflective layer connected to form an integrated structure are formed on the side of the first light-transmitting layer and the second light-transmitting layer away from the base substrate; The second reflective layer, the second light-transmitting layer and the third reflective layer constitute the light filtering part, and the first reflective layer, the first light-transmitting layer and the reflective layer constitute the light-shielding part.

15. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 14.

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