Patent Description:
In the field of display, an array substrate of a display panel is provided with a plurality of insulation layers and a plurality of conductive layers separated by the plurality of insulation layers. For example, the plurality of insulation layers include an inorganic insulation layer and an organic insulation layer, and the organic insulation layer may be made thicker than the inorganic insulation layer, so that the organic insulation layer can be used for reducing storage capacitance and reducing a load and power consumption. <CIT> provides a liquid crystal display device including: a TFT substrate including a TFT, an organic passivation film formed to cover the TFT, and an alignment film; and a counter substrate including a spacer and an alignment film. The TFT substrate and the counter substrate are bonded with a sealing material in a seal portion, with a liquid crystal interposed between the two substrates. A wall-like structure is formed in the seal portion of the counter substrate, in a direction parallel to a side of the counter substrate. A concave portion of the organic passivation film is formed at a position corresponding to the wall-like structure of the TFT substrate, in a direction parallel to the side of the TFT substrate.

It is an object of the present disclosure to provide a display substrate and a manufacturing method thereof and a display apparatus. The display substrate has a good water vapor blocking ability. The object is achieved by the features of the respective independent claims. Further embodiments are defined in the corresponding dependent claims. Even though the description refers to embodiments or to the invention, it is to be understood that the invention is defined by the claims and embodiments of the invention are those comprising at least all the features of one of the independent claims.

In order to clearly illustrate the technical solution of the embodiments of the disclosure, the drawings of the embodiments will be briefly described in the following; it is obvious that the described drawings are only related to some embodiments of the disclosure and thus are not limitative of the disclosure.

Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "first," "second," etc., which are used in the description and the claims of the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. The terms "comprises," "comprising," "includes," "including," etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects and equivalents thereof listed after these terms, but do not preclude the other elements or objects. The phrases "connect", "connected", etc., are not intended to define a physical connection or mechanical connection, but may include an electrical connection, directly or indirectly. "On," "under," "right," "left" and the like are only used to indicate relative position relationship, and when the position of the object which is described is changed, the relative position relationship may be changed accordingly.

In a display panel, due to arrangement of an organic insulation layer, paths for water vapor to enter the interior of the display panel are elongated, resulting in that reliability of a high-temperature high-humidity experiment of the display panel is reduced.

At least one embodiment of the present disclosure provides a display substrate and a manufacturing method thereof and a display apparatus. In the display substrate, a film layer (referred to "contact layer" hereafter) in contact with a sealant has a non-flat surface at a position where the film layer is in contact with the sealant, so that a position of the sealant, which is in contact with the non-flat surface, is also not flat, and thus, a path for water vapor molecules to enter a sealed region of the display panel from an interface between the sealant and the contact layer can be prolonged, thereby benefiting for increasing a water vapor blocking ability of the display panel and increasing high-temperature high-humidity reliability of the product.

The display substrate and the manufacturing method thereof and the display apparatus which are provided by the embodiments of the present disclosure will be illustrated in detail below in connection with the drawings.

At least one embodiment of the present disclosure provides a display substrate. As shown in <FIG>, the display substrate includes a base substrate 100A and a sealant <NUM> positioned on the base substrate 100A, the display substrate further includes a contact layer <NUM> which is positioned between the base substrate 100A and the sealant <NUM> and is in contact with the sealant <NUM>, and a contact layer surface 50A (an upper surface of the contact layer <NUM> as shown in the drawings) of the contact layer <NUM>, which is away from the base substrate 100A, is not flat at a contact position where the contact layer <NUM> is in contact with the sealant <NUM>, so that the sealant <NUM> is also not flat at the contact position. It should be noted that <FIG> only show part of components in the display substrate, and for example, structures such as a conductive layer, a semiconductor layer or an insulation layer and the like, which are not shown in the drawings, are also arranged between the contact layer <NUM> and the base substrate 100A.

For example, the base substrate 100A is a transparent substrate, such as a glass substrate, a quartz substrate or a plastic substrate and the like.

For example, the sealant <NUM> is organic glue, e.g., light curable glue (for example, ultraviolet light curable glue) or thermally curable glue and the like.

For example, the contact layer <NUM> is a transparent material layer such as an inorganic layer or an organic layer, and for example, the inorganic layer is an inorganic insulation layer, and the organic layer is an organic insulation layer.

For example, as shown in <FIG>, a display panel includes a first substrate <NUM> and a second substrate <NUM> which are arranged face to face, the sealant <NUM> connects the first substrate <NUM> with the second substrate <NUM>, and the first substrate <NUM> includes the base substrate 100A. For example, the display panel is a liquid crystal panel, and in this case, a sealed cavity formed by the first substrate <NUM>, the second substrate <NUM> and the sealant <NUM> is filled with a liquid crystal material so as to form a liquid crystal cell, and a spacer PS is arranged between the first substrate <NUM> and the second substrate <NUM> so as to keep a cell gap of liquid crystals. It should be noted that embodiments of the display panel include, but are not limited to, the liquid crystal panel.

For example, the first substrate <NUM> is an array substrate, the array substrate is provided with switching elements (e.g., a transistor) arranged in an array and pixel electrodes respectively and electrically connected with the switching elements, and the first substrate <NUM> further includes an electrode layer <NUM> and an alignment layer <NUM> covering the electrode layer <NUM>. For example, the alignment layer <NUM> and the sealant <NUM> do not overlap with each other. For example, the electrode layer <NUM> is a pixel electrode layer including the pixel electrode, alternatively, the electrode layer <NUM> includes a strip-shaped pixel electrode and a strip-shaped common electrode which are alternately arranged; and in other embodiments, the first substrate <NUM> further includes another electrode layer overlapping with the electrode layer <NUM>, one of the another electrode layer and the electrode layer <NUM> is a pixel electrode layer including the pixel electrode, and the other one of the another electrode layer and the electrode layer <NUM> is a common electrode layer including the common electrode.

For example, the second substrate <NUM> includes the base substrate (e.g., the transparent substrate such as the glass substrate, the quartz substrate or the plastic substrate and the like), a black matrix BM positioned on the base substrate and an overcoat layer OC positioned between the black matrix BM and the sealant <NUM>. For example, the second substrate <NUM> is a color filter substrate including a color filter layer.

For example, in order to transfer a shape of a non-flat portion of the contact layer surface 50A of the contact layer <NUM> to the sealant <NUM>, the contact layer <NUM> contacts the sealant <NUM> in such a mode that: the contact layer surface 50A of the contact layer <NUM>, which is away from the base substrate 100A, is provided with at least one contact layer groove at the contact position where the contact layer <NUM> is in contact with the sealant <NUM>, and the sealant <NUM> extends into the at least one contact layer groove.

For example, the at least one contact layer groove formed on the contact layer surface 50A of the contact layer <NUM> includes different depths of grooves. For example, as shown in <FIG>, the at least one contact layer grooves formed on the contact layer surface 50A of the contact layer <NUM> includes a first groove <NUM> and a second groove <NUM>, and the first groove <NUM> and the second groove <NUM> have different depths. In a case that the contact layer <NUM> is formed of an organic insulation layer, an organic material in a bottom of the groove with a relatively small depth among the first groove <NUM> and the second groove <NUM> can absorb part of water molecules so as to further reduce the water molecules entering a sealed region; and similarly, in a case that the contact layer <NUM> is formed of an inorganic insulation layer and the contact layer <NUM> covers the organic insulation layer, the organic material in the bottom of the groove with the relatively small depth among the first groove <NUM> and the second groove <NUM> can absorb part of water molecules, so as to further reduce the water molecules entering the sealed region.

In other embodiments, for example, the at least one contact layer groove formed on the contact layer surface 50A of the contact layer <NUM> is the same in depth.

For example, in order to further increase the water vapor blocking ability of the display panel, as shown in <FIG>, the at least one contact layer groove formed on the contact layer surface 50A of the contact layer <NUM> includes a plurality of first grooves <NUM> and a plurality of second grooves <NUM>. The plurality of first grooves <NUM> and the plurality of second grooves <NUM> are staggered, i.e., the second groove <NUM> is arranged between at least two adjacent first grooves <NUM>, and/or the first groove <NUM> is arranged between at least two adjacent second grooves <NUM>. For example, the plurality of first grooves <NUM> and the plurality of second grooves <NUM> are alternately and cyclically arranged, i.e., one second groove <NUM> is arranged between any two adjacent first grooves <NUM> and one first groove <NUM> is arranged between any two adjacent second grooves <NUM>.

For example, in order to further increase the water vapor blocking ability of the display panel, as shown in <FIG>, the at least one contact layer groove formed on the contact layer surface 50A of the contact layer <NUM> includes a closed loop-shaped groove (with reference to a deep color loop shape in <FIG>). For example, the at least one contact layer groove includes a plurality of closed loop-shaped grooves, and for example, both the first groove <NUM> and the second groove <NUM> are the closed loop-shaped grooves. It should be noted that a region surrounded by two dotted lines in <FIG> is a region where the sealant <NUM> is positioned, a region surrounded by the region where the sealant <NUM> is positioned is the sealed region. For example, the aforementioned spacer PS, the alignment layer <NUM> and the electrode layer <NUM> are arranged in the sealed region.

For example, a non-flat organic layer is formed on the base substrate 100A, and then the contact layer <NUM> covering the organic layer (for example, the contact layer <NUM> covers and is in direct contact with the organic layer) is formed, in this way, the contact layer surface 50A of the contact layer <NUM> is not flat at the contact position where the contact layer <NUM> is in contact with the sealant <NUM>. In this case, for example, as shown in <FIG>, a display substrate provided by at least one embodiment of the present disclosure further includes an organic layer <NUM> positioned between the base substrate 100A and the contact layer <NUM>. An organic layer surface 14A (with reference to an upper surface of the organic layer <NUM> in the drawings) of the organic layer <NUM>, which is away from the base substrate 100A, is not flat at a position of the sealant <NUM>, that is, the organic layer surface 14A of the organic layer <NUM> is provided with a non-flat portion overlapping with the sealant <NUM>, so that the contact layer surface 50A of the contact layer <NUM> is not flat at the contact position.

It should be noted that <FIG> only show part of components in the display substrate, and for example, structures such as a conductive layer, a semiconductor layer or an insulation layer and the like, which are not shown in the drawings, are also arranged between the organic layer <NUM> and the base substrate 100A. In addition, the arrangement mode of the contact layer <NUM> and the sealant <NUM> in <FIG> can refer to related description in the embodiment as shown in <FIG>, and is not repeated herein.

In the embodiment of the present disclosure, even if both the contact layer <NUM> and the non-flat portion overlap with the sealant <NUM>, the mask plate for forming the contact layer <NUM> doesn't need to change, because the non-flat organic layer <NUM> is firstly formed and then the contact layer in direct contact with the organic layer <NUM> is formed, in this way, the non-flat portion of the contact layer <NUM> is formed. It only needs to avoid that the formed contact layer <NUM> fills and levels up the non-flat portion of the organic layer <NUM>. For example, as shown in <FIG>, the contact layer <NUM> is not flat and is continuous at the position of the non-flat portion of the organic layer <NUM>.

For example, the organic layer surface 14A of the organic layer <NUM>, which is away from the base substrate 100A, is provided with at least one organic layer groove at the position of the sealant <NUM>, the contact layer <NUM> extends into the at least one organic layer groove, and the sealant <NUM> also extends into the at least one organic layer groove. In the embodiment of the present disclosure, the organic layer <NUM> can be made thicker, which enables the organic layer groove in the organic layer <NUM> to have a large depth, so that a portion of the sealant <NUM>, which extends into the organic layer groove, has a large length, thereby further benefiting for prolonging the path for the water molecules to enter the sealed region (the entrance path of the water molecules can refer to <FIG>) to further increase the water vapor blocking ability of the display panel.

In order to avoid a case that an excessive opening width of the organic layer groove causes large influence on the water vapor blocking ability of the display panel, the opening width of the at least one organic layer groove in the organic layer <NUM> is, for example, smaller than or equal to <NUM> micrometers, i.e., a size of an orthographic projection of each organic layer groove on the base substrate 100A is smaller than or equal to <NUM> micrometers. In consideration of accuracy of the mask for producing the organic layer <NUM>, for example, the opening width of each organic layer groove is greater than or equal to <NUM> micrometers and less than or equal to <NUM> micrometers.

For example, as shown in <FIG>, the at least one organic layer groove disposed on the organic layer surface 14A of the organic layer <NUM> and at the position of the sealant <NUM> includes at least one via-hole typed groove <NUM> and at least one blind-hole typed groove <NUM>, a depth of the via-hole typed groove <NUM> is equal to a thickness of the organic layer <NUM> so as to enable the via-hole typed groove <NUM> to penetrate the organic layer <NUM>, and a depth of the blind-hole typed groove <NUM> is smaller than the thickness of the organic layer <NUM>. A material of the organic layer at the position of the blind-hole typed groove <NUM> can absorb part of water molecules so as to further reduce the water molecule entering the sealed region.

For example, as shown in <FIG>, the organic layer groove includes a plurality of via-hole typed grooves <NUM> (in <FIG>, there are two via-hole typed grooves for example), and the depth of each via-hole typed groove <NUM> is equal to the thickness of the organic layer <NUM>. For example, as shown in <FIG>, each via-hole typed groove <NUM> is a closed loop-shaped groove.

For example, in any one of embodiments of the present disclosure, the organic layer <NUM> can be made from resin or a similar transparent insulation organic material so as to obtain a large thickness.

For example, as shown in <FIG>, a display substrate provided by at least one embodiment of the present disclosure includes a first inorganic layer <NUM> positioned on the base substrate 100A and a second inorganic layer <NUM> positioned on a side of the first inorganic layer <NUM>, which is away from the base substrate 100A. Orthographic projections of the first inorganic layer <NUM> and the second inorganic layer <NUM> on the base substrate 100A both overlap with an orthographic projection of the sealant <NUM> on the base substrate 100A, and both orthographic projections of the first inorganic layer <NUM> and the second inorganic layer <NUM> on the base substrate 100A are positioned between the contact layer <NUM> and the base substrate 100A. Herein, the term "overlap" means that there is an overlap region between comparison objects, and thus, the comparison objects may completely coincide with each other, and also may partially coincide with each other. In this embodiment, each of the orthographic projections of the first inorganic layer <NUM> and the second inorganic layer <NUM> on the base substrate 100A has an overlap region with the orthographic projection of the sealant <NUM> on the base substrate 100A, and the non-flat surface of the contact layer <NUM> is formed in the overlap regions, so as to further increase the water vapor blocking ability of the display panel. It should be noted that the arrangement mode of the contact layer <NUM> and the sealant <NUM> in the embodiment as shown in <FIG> can refer to related description in the embodiment as shown in <FIG>, and the arrangement mode of the organic layer <NUM> in the embodiment as shown in <FIG> can refer to related description in the embodiment as shown in <FIG>, which are not repeated herein.

For example, the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are all inorganic insulation layers. For example, as shown in <FIG>, a first metal layer <NUM>, a semiconductor layer <NUM>, a second metal layer <NUM> and an electrode layer <NUM> are sequentially arranged on the base substrate 100A. The first inorganic layer <NUM> is positioned between the first metal layer <NUM> and the semiconductor layer <NUM>, the second inorganic layer <NUM> is positioned between the semiconductor layer <NUM> and the second metal layer <NUM>, and both the organic layer <NUM> and the contact layer <NUM> are positioned between the second metal layer <NUM> and the electrode layer <NUM>.

For example, the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> can be formed by the same mask process (i.e., a patterning process achieved by using the same mask). For example, in the same mask process, a via hole <NUM> as shown in <FIG>, which simultaneously penetrates the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM>, is formed by dry etching. The via hole <NUM> is used for implementing, for example, an electrical connection between a conductive structure which the electrode layer <NUM> includes and a conductive structure which the first metal layer <NUM> includes.

For example, for the same dry etching process (i.e., a dry etching step which the same mask process includes), dry etching rates of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are sequentially increased (i.e., the smaller a distance to the base substrate 100A is, the smaller the dry etching rate is); in other words, the layer further away from the base substrate 100A is easier to etch. It is beneficial for enabling the via hole <NUM> simultaneously penetrating the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> to have a good appearance, i.e., an opening size of the via hole <NUM> is gradually increased in a direction away from the base substrate, so as to ensure the electrical connection between different conductive structures at the position of the via hole <NUM>.

In study, an inventor of the present application founds that, in a case that materials of the plurality of inorganic layers which the display substrate includes adopt the same chemical composition, the higher refractive index of the inorganic layer is, the smaller the dry etching rate of the inorganic layer is. Based on this, the inventor of the present application notices that a good dry etching effect and a high light-transmittance can be simultaneously obtained while the materials of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are same in their chemical compositions and the refractive indices of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are sequentially reduced (i.e., the smaller the distance to the base substrate 100A is, the higher the refractive index is). Namely, after dry-etching, a laminated structure of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> not only has a high light transmittance, but also makes the via hole <NUM> having the good appearance. In a case that the sealant <NUM> is the light curable type sealant, a good curable effect can be obtained so as to promote stripping resistance of the sealant <NUM>.

For example, a material of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> is selected from a group consisting of silicon dioxide, silicon nitride, and silicon oxynitride and combination thereof. For example, all the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are silicon dioxide thin films, or are silicon nitride thin films, or are silicon oxynitride thin film. The refractive indices of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are sequentially reduced, and in this case, for ultraviolet light in a wavelength range of <NUM> to <NUM> or ultraviolet light in a wavelength range of <NUM> to <NUM>, the light transmittances of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are sequentially increased. For example, as shown in <FIG>, the refractive indices (RI) of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are <NUM>, <NUM> and <NUM> respectively, and for the ultraviolet light in the wavelength range of <NUM> to <NUM> or the ultraviolet light in the wavelength range of <NUM> to <NUM>, their light transmittances are sequentially increased along with increase of the refractive indices.

In other embodiments, for example, the materials of the first inorganic layer <NUM> and the second inorganic layer <NUM> are the same in chemical composition, and the refractive index of the first inorganic layer <NUM> is greater than the refractive index of the second inorganic layer <NUM>; alternatively, the material of one of the first inorganic layer <NUM> and the second inorganic layer <NUM> has same chemical composition with the contact layer <NUM>, and the refractive index of one of the first inorganic layer <NUM> and the second inorganic layer <NUM> is greater than the refractive index of the second inorganic layer <NUM>.

In other embodiments, for example, as shown in <FIG>, a display substrate provided by at least one embodiment of the present disclosure includes a first inorganic layer <NUM> covering the base substrate 100Aand a second inorganic layer <NUM> covering the first inorganic layer <NUM>, both the first inorganic layer <NUM> and the second inorganic layer <NUM> overlap with the sealant <NUM>, and the second inorganic layer <NUM> is used as the contact layer <NUM>.

It should be noted that <FIG> only shows part of components of the display substrate, and for example, structures such as a conductive layer, a semiconductor layer or an insulation layer and the like, which are not shown in the drawing, are also arranged between the first inorganic layer <NUM> and the base substrate 100A. In addition, the arrangement mode of the contact layer <NUM> and the sealant <NUM> in the embodiment as shown in <FIG> can refer related description in the embodiment as shown in <FIG>, and the arrangement mode of the organic layer <NUM> in the embodiment as shown in <FIG> can refer to related description in the embodiment as shown in <FIG>, which are not repeated herein.

For example, for the same dry etching process, a dry etching rate of the first inorganic layer <NUM> is smaller than a dry etching rate of the second inorganic layer <NUM>. It is beneficial for enabling a via hole simultaneously penetrating the first inorganic layer <NUM> and the second inorganic layer <NUM> to have a good appearance so as to ensure an electrical connection between different conductive structures at the position of the via hole.

For example, materials of the first inorganic layer <NUM> and the second inorganic layer <NUM> are the same in chemical composition and a refractive index of the first inorganic layer <NUM> is greater than a refractive index of the second inorganic layer <NUM>, which not only are beneficial for enabling a laminated structure of the first inorganic layer <NUM> and the second inorganic layer <NUM> to form the via hole with the good appearance after dry etching, but also can enable the laminated structure to have a high light transmittance.

For example, both the first inorganic layer <NUM> and the second inorganic layer <NUM> are silicon dioxide thin films, or are silicon nitride thin films or are silicon oxynitride thin films, and the refractive index of the first inorganic layer <NUM> is greater than the refractive index of the second inorganic layer <NUM>. In this case, for the ultraviolet light in the wavelength range of <NUM> to <NUM> or the ultraviolet light in the wavelength range of <NUM> to <NUM>, a light transmittance of the first inorganic layer <NUM> is smaller than a light transmittance of the second inorganic layer <NUM>, so that the laminated structure of the first inorganic layer <NUM> and the second inorganic layer <NUM> has a high light transmittance.

At least one embodiment of the present disclosure further provides a display apparatus, which includes the display substrate according to any one of the aforementioned embodiments.

For example, the display apparatus provided by the embodiment of the present disclosure can be any product or component with a display function, such as a liquid crystal panel, electronic paper, an Organic Light-Emitting Diode (OLED) panel, a mobile phone, a laptop personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

At least one embodiment of the present disclosure further provides a manufacturing method of a display substrate. By taking the display substrate as shown in <FIG>, <FIG>, <FIG> and <FIG> as an example, the method includes: forming the contact layer <NUM> on the base substrate 100A; and forming the sealant <NUM> on the contact layer <NUM>, the sealant <NUM> being in contact with the contact layer <NUM>, such that the contact layer surface 50A of the contact layer <NUM>, which is away from the base substrate 100A, is not flat at the contact position where the contact layer <NUM> is in contact with the sealant <NUM>.

For example, the sealant <NUM> is formed by a curing process. For example, the sealant <NUM> is formed by a light curing (e.g., an ultraviolet curing) process. For example, wet glue for forming the sealant <NUM> is irradiated by the light from the same side of the base substrate <NUM> to be cured, so as to obtain the sealant <NUM>. For example, the sealant <NUM> is also formed by a thermal curing process.

It should be noted that as shown in <FIG>, <FIG>, <FIG> and <FIG>, the display panel includes a first substrate <NUM> and a second substrate <NUM> which are arranged face to face. In the manufacturing method provided by the embodiment of the present disclosure, the wet glue is first coated on the first substrate <NUM>, and then, the wet glue is connected with the second substrate <NUM>, next, the wet glue is cured to obtain the sealant <NUM>; alternatively, the wet glue is first coated on the second substrate <NUM>, and then, the wet glue is connected with the first substrate <NUM>, next, the wet glue is cured to obtain the sealant <NUM>.

For example, the manufacturing method provided by at least one embodiment of the present disclosure further includes: as shown in <FIG>, forming an organic material layer <NUM> on the base substrate 100A; and forming the organic layer <NUM> as shown in <FIG>, <FIG> and <FIG> by performing patterning processing on the organic material layer <NUM>; the organic layer surface 14A of the organic layer <NUM>, which is away from the base substrate <NUM> A, is not flat at the position of the sealant <NUM>, so that the contact layer surface 50A of the contact layer <NUM> is not flat at the contact position.

For example, patterning processing for forming the organic layer <NUM> includes steps of performing exposure process on the organic material layer <NUM> by using a mask and performing development process on the exposed material. In this case, the organic layer <NUM> is produced by adopting a photoresist, and for example, the organic layer <NUM> adopts a negative photoresist so as to obtain a better water vapor blocking ability; alternatively, patterning processing for forming the organic layer <NUM> includes steps of coating the photoresist, performing exposure process on the photoresist by using the mask, performing development process on the exposed photoresist to form a photoresist pattern and performing etching process by using the photoresist pattern.

For example, for the display substrate as shown in <FIG>, a manufacturing method provided by at least one embodiment of the present disclosure includes: as shown in <FIG>, sequentially forming a first inorganic material layer <NUM>, a second inorganic material layer <NUM> and a contact-layer material layer <NUM> on the base substrate 100A. For example, the patterned organic layer <NUM> is formed after the formation of the first inorganic material layer <NUM> and the second inorganic material layer <NUM>, and then the contact-layer material layer <NUM> is formed on the organic layer <NUM>. In the same mask process, the patterning processing is performed on the first inorganic material layer <NUM>, the second inorganic material layer <NUM> and the contact-layer material layer <NUM> so as to respectively form the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM>, as shown in <FIG>. For a dry etching process which the same mask process includes, dry etching rates of the first inorganic material layer <NUM>, the second inorganic material layer <NUM> and the contact-layer material layer <NUM> are sequentially increased. It is beneficial for enabling the via hole <NUM> simultaneously penetrating the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> to have a good appearance, i.e., the opening size of the via hole <NUM> is gradually increased in the direction away from the base substrate, so as to ensure the electrical connection between different conductive structures at the position of the via hole <NUM>.

For example, a mask process includes steps of coating the photoresist, performing exposure process on the photoresist by using a mask, performing development process on the exposed photoresist to form the photoresist pattern and performing dry etching based on the photoresist pattern.

For example, materials of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are the same in chemical composition and the refractive indices of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are sequentially reduced, in this way, after dry-etching, a laminated structure of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> not only has a high light transmittance, but also makes the via hole <NUM> having the good appearance. In a case that the sealant <NUM> is the light curable type sealant, a good curable effect can be obtained so as to promote stripping resistance of the sealant <NUM>.

For example, a material of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> is selected from a group consisting of silicon dioxide, silicon nitride, and silicon oxynitride and combination thereof. For example, all the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are silicon dioxide thin films, or are silicon nitride thin films or are silicon oxynitride thin film. The refractive indices of the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are sequentially reduced, and in this case, in the manufacturing method provided by at least one embodiment of the present disclosure, forming the sealant <NUM> includes: irradiating the wet glue for forming the sealant <NUM> from one side of the base substrate 100A by using ultraviolet light in a wavelength range of <NUM> to <NUM> or ultraviolet light in a wavelength range of <NUM> to <NUM> so as to obtain the cured sealant <NUM>.

For example, the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are all formed by using chemical vapor deposition, or plasma enhanced chemical vapor deposition, or other methods. For example, in a case that the first inorganic layer <NUM>, the second inorganic layer <NUM> and the contact layer <NUM> are all the silicon nitride thin films, a plurality of silicon nitride thin films which are the same in chemical composition but different in refractive index are formed by regulating the following parameters, such as a radio frequency power, a pressure in a film forming chamber, concentrations of reaction gases silane (SiH4) and ammonia gas (NH3) and the like.

For example, for the display substrate as shown in <FIG>, a manufacturing method provided by at least one embodiment of the present disclosure includes: as shown in <FIG>, sequentially forming a first inorganic material layer <NUM> and a second inorganic material layer <NUM> between the base substrate 100A and the sealant <NUM>; and in the same mask process, performing patterning processing on the first inorganic material layer <NUM> and the second inorganic material layer <NUM> to respectively form the first inorganic layer <NUM> and the second inorganic layer <NUM> as shown in <FIG>, the second inorganic layer <NUM> being used as the contact layer <NUM>; for a dry etching process which the same mask process includes, a dry etching rate of the first inorganic material layer <NUM> being smaller than a dry etching rate of the second inorganic material layer <NUM>.

For example, both the first inorganic layer <NUM> and the second inorganic layer <NUM> are silicon dioxide thin films, or are silicon nitride thin films or are silicon oxynitride thin films, and the refractive indices of the first inorganic layer <NUM> and the second inorganic layer <NUM> are sequentially reduced. In this case, in the manufacturing method provided by at least one embodiment of the present disclosure, forming the sealant <NUM> includes: irradiating the wet glue for forming the sealant <NUM> from one side of the base substrate 100A by using ultraviolet light in a wavelength range of <NUM> to <NUM> or ultraviolet light in a wavelength range of <NUM> to <NUM> so as to obtain the cured sealant <NUM>.

For example, both the first inorganic layer <NUM> and the second inorganic layer <NUM> are formed by using chemical vapor deposition, or plasma enhanced chemical vapor deposition, or other methods. For example, a plurality of thin films which are the same in chemical composition but different in refractive index can be formed by regulating the following parameters, such as the radio frequency power, the pressure in a film forming chamber, concentrations of reaction gases and the like.

In the manufacturing method provided by the embodiments of the present disclosure, the arrangement mode of each component can refer to related description in the embodiments of the display substrate, and is not repeated herein.

In view of foregoing, the embodiments of the present disclosure provide the display substrate and the manufacturing method thereof and the display apparatus. The film layer in contact with the sealant has the non-flat surface at the position where the film layer is in contact with the sealant, so that the sealant is a non-flat at a position where the sealant is in contact with the non-flat surface. Thus, the path for the water vapor molecules to enter the sealed region of the display panel from the interface between the sealant and the contact layer can be prolonged, thereby benefiting for increasing the water vapor blocking ability of the display panel. In some embodiments, in a case of forming the sealant by using a light curable process, the transmittance of light for curing the sealant can be increased by enabling the materials of a plurality of inorganic layers between the sealant and the base substrate to be the same in chemical composition and enabling their refractive indices to be sequentially reduced, so as to increase the curing effect and stripping resistance of the sealant.

In the disclosure, the following should be noted:.

Claim 1:
A display substrate, comprising:
a base substrate (100A);
a sealant (<NUM>) on the base substrate (100A); and
a contact layer (<NUM>) between the base substrate (100A) and the sealant (<NUM>), the contact layer (<NUM>) being in contact with the sealant (<NUM>), a contact layer surface (50A) of the contact layer (<NUM>) away from the base substrate (100A) is non-flat at a contact position where the contact layer (<NUM>) is in contact with the sealant (<NUM>);
wherein the contact layer surface (50A) comprises at least one contact layer groove at the contact position where the contact layer (<NUM>) is in contact with the sealant (<NUM>), and the sealant (<NUM>) extends into the at least one contact layer groove;
wherein the at least one contact layer groove comprises a first groove (<NUM>) and a second groove (<NUM>), and the first groove (<NUM>) and the second groove (<NUM>) are different in depth;
wherein the first groove (<NUM>) is plural;
characterised in that
the second groove (<NUM>) is plural, and the plurality of first grooves (<NUM>) and the plurality of second grooves (<NUM>) are staggered;
a the second groove (<NUM>) is arranged between at least two adjacent first grooves (<NUM>), and/or a first groove (<NUM>) is arranged between at least two adjacent second grooves (<NUM>);
the contact layer (<NUM>) is continuous in the plurality of first grooves (<NUM>) and the plurality of second grooves (<NUM>).