Patent Description:
The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display apparatus.

Active matrix organic light-emitting diode (AMOLED) display apparatuses have advantages such as thinness, lightness, a wide viewing angle, active luminescence, emitted light of continuous and adjustable color, low cost, a quick response speed, low energy consumption, a low driving voltage, a wide operating temperature range, a simple manufacturing process, and high luminescence efficiency.

In the AMOLED display apparatus, electrodes (such as a cathode) and organic functional layers (such as a light-emitting layer) of the organic light-emitting diode (OLED) apparatus is prone to be eroded by moisture and oxygen, which leads to a reduction of the service life thereof. Therefore, it is necessary to encapsulate the AMOLED display apparatus. Thin film encapsulation (TFE) is one of the commonly used encapsulation methods.

<CIT> provides an organic light emitting display device including a dam structure disposed in a non-display area of a substrate and an align mark disposed outside the dam structure. Since the align mark is disposed outside the dam structure, the align mark is not covered by the dam structure, and thus, a scribing process is smoothly performed.

<CIT> provides a liquid crystal display according to an exemplary embodiment including a display substrate including a display area for displaying an image and a non-display area enclosing the display area; a plurality of normal pixels formed in an edge region among a center region of the display area and a peripheral area of the display area, and a plurality of corner pixels formed in a corner region of the peripheral area of the display area; and a sealant formed in the non-display area. A corner pixel of the plurality of corner pixels and the sealant are separated from each other.

<CIT> provides a display device including a substrate including a display area and a non-display area surrounding the display area, a thin-film encapsulation layer disposed on the substrate, and a first blocking dam disposed outside the display area, the first blocking dam having at least one layer. Portions of the first blocking dam is removed, and thus, the divided pieces of the first blocking dam are spaced apart from each other, and a second blocking dam is disposed in at least one of a front portion and a rear portion of the first blocking dam corresponding to the spaced part.

<CIT> discloses a display panel, a manufacturing method of the display panel and a display device, and belongs to the technical field of display. The display panel comprises an array substrate and a packaging cover plate which are oppositely arranged, at least one target substrate is arranged in the array substrate and the packaging cover plate, and the target substrate is provided with a display area and a non-display area; a supporting structure is arranged in the non-display area, and the side, away from the display area, of the supporting structure is coplanar with one side face of the array substrate or the packaging cover plate; the supporting structure is obtained from a cutting supporting structure in a display mother board when the display mother board is cut along a cutting line to form the display panel; the orthographic projection of the cutting supporting structure on the target substrate covers the area where the cutting line is located, so that when the display mother board is cut, the display mother board is cut along the cutting supporting structure, the problem that the stress of the display mother board is uneven due to cutting of other areas is avoided, and the appearance and quality of the display panel are ensured.

<CIT> provides a display panel manufacturing method, a display panel and a display device, and relate to the technical field of display. The display panel comprises a display area and a package area around the display area. The package area is sealed with package resin. The corners of the package area are sealed with package resin recessed towards the display area, and a cutting line is arranged along the package resin. The cutting line at the corners is disposed outside the package resin recessed towards the display area, and the display panel is cut along the cutting line. In order to get a narrow-bezel display panel, the package resin at the corners of the package area is designed in such a way that the package resin is recessed towards the display area, and thus, the cutting line at the corners is disposed outside the package resin. The problem that package reliability test fails as the package area can easily crack at the corners is eliminated, and the cutting yield of the display panel is increased.

In one aspect, a display substrate is provided. The display substrate is defined by appended claim <NUM>.

In another aspect, a display apparatus is provided. The display apparatus is defined by appended claim <NUM>.

In order to describe technical solutions in embodiments of the present disclosure more clearly, the accompanying drawings to be used in the description of embodiments will be introduced briefly below. Obviously, the accompanying drawings to be described below are merely some embodiments of the present disclosure, and a person of ordinary skill in the art can obtain other drawings according to these drawings.

The technical solutions in some embodiments of the present disclosure will be described below with reference to the accompanying drawings of some embodiments of the present disclosure. Obviously, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments made on the basis of some embodiments of the present disclosure by a person of ordinary skill in the art shall be included in the protection scope of the present disclosure.

With the development of society and advancement of technology, organic light-emitting diode (OLED) display apparatuses are becoming more and more widely used. According to different driving methods, the organic light-emitting diode display apparatuses include active matrix organic light-emitting diode (AMOLED) display apparatuses and passive matrix organic light-emitting diode (PMOLED) display apparatuses.

Some embodiments of the present disclosure are described by taking an example in which the AMOLED display apparatus is used, but this cannot be regarded as a limitation on the application scope of the technical solutions provided by the present disclosure. In some other embodiments, the technical solutions provided by the present disclosure may also be applied to other display apparatuses except the AMOLED display apparatus. For example, other display apparatuses except the AMOLED display apparatus are micro light-emitting diode (Micro-LED) display apparatuses, mini light-emitting diode (Mini-LED) display apparatuses, etc..

As shown in <FIG>, in the related art, a display substrate <NUM>' of a display apparatus includes a base substrate <NUM>', a pixel driving circuit disposed on the base substrate <NUM>', an OLED device, a blocking dam <NUM>', etc.; and an encapsulation film <NUM>' covering the aforementioned structures. The display substrate <NUM>' has a display region AA and a bezel region BB surrounding the display region AA. An edge of the encapsulation film <NUM>' for encapsulation is located in the bezel region BB. The encapsulation film <NUM>' may block external moisture and oxygen. However, during testing and actual use of the display substrate <NUM>', due to the deterioration of a sealing performance of the encapsulation film <NUM>', external moisture and oxygen enter the display substrate <NUM>', thereby causing encapsulation of the encapsulation film <NUM>' to fail.

After study, the inventor of the present disclosure have discovered that one of the reasons causing the sealing performance of the encapsulation film <NUM>' to deteriorate is that: at corners of the edge of the display substrate <NUM>', the corners of the edge of the encapsulation film <NUM>' are right angles. In a case where the display substrate is subjected to external pressure, squeeze or impact, stress tends to concentrate at tips of the right-angle corners of the edge of the encapsulation film <NUM>' and accumulate. Therefore, local stress at the corners of the edge of the encapsulation film <NUM>' is very large, which causes the encapsulation film <NUM>' to crack, and then causes external moisture and oxygen to enter the inside of the display substrate <NUM>'. As a result, it affects the service life of the display panel.

On this basis, as shown in <FIG>, some embodiments of the present disclosure provide a display substrate <NUM>. The display substrate <NUM> includes a base substrate <NUM> and an encapsulation film <NUM> disposed at a first side a of the base substrate <NUM>. At least one corner of the edge of the encapsulation film <NUM> is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner.

It will be noted that, in this document, the corner of the edge of the encapsulation film <NUM> is the rounded corner or in an embodiment not forming part of the claimed invention, the substantially rounded corner, which may mean that, at the corner, the edge of the encapsulation film <NUM> is an arc or in an embodiment not forming part of the claimed invention, a substantially arc. Two straight sides of the encapsulation film <NUM> at both ends of the arc are tangent to the arc. A radius of the rounded corner is a radius of the arc.

In an embodiment not forming part of the claimed invention, "the substantially rounded corner" may mean that an arc of "the substantially rounded corner" is a non-absolute smooth arc or a non-standard arc. For example, the non-absolute smooth arc includes an arc having tiny protrusions or depressions, an arc formed by a plurality of short straight lines or curved lines connected end-to-end in accordance with a direction of the arc, etc. For example, the non-standard arc includes an elliptical arc, etc..

In some examples, as shown in <FIG>, the base substrate <NUM> includes a first side a and a second side b that are disposed oppositely. The encapsulation film <NUM> is disposed at the first side a of the base substrate <NUM>.

In this way, a sharp corner (such as a right angle) of the edge of the encapsulation film <NUM> is eliminated by arranging the corner of the edge of the encapsulation film <NUM> to be a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner. In a case where the display substrate <NUM> is pressed, stress will not accumulate at a certain position of the corner of the edge of the encapsulation film <NUM>, and the rounded corner may make the stress more evenly distribute at different positions of the corner of the encapsulation film <NUM>. It is beneficial to reduce the stress at the corner of the edge of the encapsulation film <NUM>. Moreover, the cracking of the encapsulation film <NUM> due to excessive stress, which may cause an invasion of moisture and oxygen, may be avoided. In this way, the sealing effect of the encapsulation film <NUM> may be improved, and the service life of the display substrate <NUM> may be increased.

In some examples, the edge of the encapsulation film <NUM> has a plurality of corners, and at least one of the plurality of corners is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner. For example, the shape of the display substrate is a rectangle, and the edge of the encapsulation film <NUM> has four corners. One, two, three, or all of the four corners are rounded corner(s) or in an embodiment not forming part of the claimed invention, substantially rounded corner(s). In a case where all corners of the edge of the encapsulation film <NUM> are rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners, there is no stress concentrating at all corners of the edge of the encapsulation film. Therefore, the sealing effect of the encapsulation film <NUM> is further improved.

The embodiments of the present disclosure do not limit the number of rounded corners (or in an embodiment not forming part of the claimed invention, substantially rounded corners) of the edge of the encapsulation film <NUM> Some embodiments and drawings of the present disclosure illustrate that all corners of the edge of the encapsulation film <NUM> are rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners.

In order to facilitate the subsequent introduction of the embodiments, structures disposed on the base substrate <NUM> is first described below. Obviously, the specific structure introduced may not constitute a limitation on the structure of the display substrate <NUM> in the embodiments of the present disclosure. Based on the inventive concept of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art shall be included in the protection scope of the present disclosure.

In some embodiments, as shown in <FIG>, the display substrate <NUM> includes a base substrate <NUM>, a buffer layer <NUM> formed on the base substrate <NUM>, and pixel driving circuits formed on the buffer layer <NUM> and arranged in an array. Each pixel driving circuit includes a plurality of thin film transistors (TFT) and at least one capacitor. The present disclosure does not limit the type of the thin film transistors. For example, the thin film transistor is a top-gate thin film transistor, a bottom-gate thin film transistor (as shown in <FIG>) or a double-gate thin film transistor. In an example where the thin film transistor is a bottom-gate thin film transistor shown in <FIG>, the thin film transistor includes an active layer <NUM>, a gate <NUM>, a source <NUM> and a drain <NUM> connected to the active layer <NUM>, a gate insulating layer <NUM> that isolates the gate <NUM> from the active layer <NUM>, and an inter level dielectric (ILD) layer <NUM> that isolates the gate <NUM> from the source <NUM> and the drain <NUM>. In some other embodiments, the display substrate <NUM> does not include the buffer layer <NUM>.

In some examples, as shown in <FIG>, the display substrate <NUM> further includes a passivation layer <NUM> and a planarization (PLN) layer <NUM> of the pixel driving circuit that are sequentially stacked on top of one another. Via holes are provided in the passivation layer <NUM> and the planarization layer <NUM> at a position corresponding to the drain <NUM> of the thin film transistor TFT. The display substrate <NUM> further includes an anode layer <NUM> disposed on a side of the planarization layer <NUM> away from the base substrate <NUM>. The anode layer <NUM> is electrically connected to the drain <NUM> of the thin film transistor TFT through the via holes. In some other examples, the display substrate <NUM> may include one of the passivation layer <NUM> and the planarization layer <NUM>. In this case, the via hole for electrically connecting the anode layer <NUM> and the drain <NUM> of the thin film transistor TFT is only disposed in one of the passivation layer <NUM> and the planarization layer <NUM>. In some other examples, the display substrate <NUM> may not include the passivation layer <NUM> and the planarization layer <NUM>, and the anode layer <NUM> is electrically connected to the drain <NUM> of the thin film transistor TFT directly.

In some examples, with continued reference to <FIG>, the display substrate <NUM> further includes a pixel definition layer (PDL) <NUM> disposed on a side of the anode layer <NUM> away from the base substrate <NUM>. The pixel definition layer <NUM> is provided with openings. The display substrate <NUM> further includes an organic functional layer that is formed in the openings and provided with OLED devices. The organic functional layer includes an organic light-emitting layer <NUM>, and may also include at least one of a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, etc. The display substrate <NUM> further includes a cathode layer <NUM> disposed on a side of the organic light-emitting layer <NUM> and a side of the pixel definition layer <NUM> that are away from the base substrate <NUM>. The cathode layer <NUM> is electrically connected to a cathode wiring <NUM> through a cathode lap-joint layer <NUM>. In some other examples, with continued reference to <FIG>, the display substrate <NUM> further includes a photo spacer (PS) <NUM> disposed on a side of the pixel definition layer <NUM> away from the base substrate <NUM>.

For example, the organic light-emitting layer <NUM> may be an organic light-emitting layer capable of emitting red (R) light, an organic light-emitting layer capable of emitting green (G) light, or an organic light-emitting layer capable of emitting blue (B) light. For another example, the organic light-emitting layer <NUM> may be an organic light-emitting layer capable of emitting white light. In this case, the display substrate <NUM> further includes a color filter layer, and the color filter layer includes filter portions of multiple colors (such as a filter portion of red color, a filter portion of green color, and a filter portion of blue color) to filter white light emitted by the organic light-emitting layer <NUM>.

In the claimed invention, as shown in <FIG>, the corner of the edge of the encapsulation film <NUM> is a rounded corner, a radius RF of which satisfies: <MAT>.

Where L is a length of a diagonal of the display substrate <NUM>, and α<NUM> is a coefficient related to the length of the diagonal of the display substrate <NUM>.

It will be noted that, for example, as shown in <FIG>, the shape of the display substrate <NUM> is a rectangle, and the diagonal of the display substrate <NUM> is a line segment between two diagonal vertexes of the display substrate <NUM>. For another example, the shape of the display substrate <NUM> is a rectangle having rounded corners, and the diagonal of the display substrate <NUM> is a line segment between the midpoints of the arcs of the two diagonal rounded corners of the display substrate <NUM>.

In some embodiments, a value of α<NUM> is positively related to the length of the diagonal of the display substrate <NUM>. That is, the longer the length of the diagonal of the display substrate <NUM> is, the greater the value of α<NUM> is. For example, the value of α<NUM> is <NUM> to <NUM> times the length of the diagonal of the display substrate <NUM>. For example, the value of α<NUM> is <NUM> times the length of the diagonal of the display substrate <NUM>. It will be noted that the present disclosure does not limit the length of the diagonal of the display substrate <NUM> and a unit of the length. Exemplarily, the length of the diagonal of the display substrate <NUM> is <NUM> to <NUM> (for example, the length of the diagonal of the display substrate <NUM> is <NUM> to <NUM>).

In the claimed invention, the value range of α<NUM> is <NUM> ≤ α<NUM> ≤ <NUM>. For example, the length of the diagonal of the display substrate <NUM> is <NUM> to <NUM>. According to a multiple relationship between the value of α<NUM> and the length of the diagonal of the display substrate <NUM> (for example, the value of α<NUM> is <NUM> times the length of the diagonal of the display substrate <NUM>), the value range of α<NUM> is <NUM>≤ α<NUM> ≤<NUM>.

For example, a length L of the diagonal of the display substrate <NUM> is <NUM>, the value of α<NUM> is <NUM>, and the radius RF of the corner of the edge of the encapsulation film <NUM>, which is a rounded corner, is <NUM>. Or, the length L of the diagonal of the display substrate <NUM> is <NUM>, the value of α<NUM> is <NUM>, and the radius RF of the corner of the edge of the encapsulation film <NUM>, which is a rounded corner, is <NUM>. Or, the length L of the diagonal of the display substrate <NUM> is <NUM>, the value of α<NUM> is <NUM>, and the radius RF of the corner of the edge of the encapsulation film <NUM>, which is a rounded corner, is <NUM>.

In some embodiments, as shown in <FIG>, the encapsulation film <NUM> includes at least one organic film layer <NUM>. The display substrate <NUM> further includes at least one blocking dam <NUM> disposed at the first side a of the base substrate <NUM>. The at least one blocking dam <NUM> is disposed around the at least one organic film layer <NUM>. The at least one blocking dam <NUM> is configured to block the organic film layer <NUM>. At least one corner of the blocking dam <NUM> is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner.

In some embodiments, a material of the organic film layer <NUM> is a flexible material. For example, the material of the organic film layer <NUM> is an acrylic polymer, a silicon-based polymer, an epoxy-based polymer, etc. This is convenient to realize the flexible function of the encapsulation film <NUM> and the display substrate <NUM>. For example, in a case where the material of the base substrate <NUM> is a flexible material, the display substrate <NUM> composed of the encapsulation film <NUM> including the organic film layer <NUM> is a flexible display substrate.

In some embodiments, a thickness of the organic film layer <NUM> is <NUM> to <NUM>. For example, the thickness of the organic film layer <NUM> is <NUM> to <NUM>, <NUM> to <NUM>, <NUM> to <NUM>, <NUM> to <NUM>, etc..

In some embodiments, a method of manufacturing the organic film layer <NUM> may be an ink jet printing (IJP) method, a polymer monomer deposition method, a plasma enhanced chemical vapor deposition (PECVD) method, a spin coating method, a spray coating method, etc. In addition, when the organic film layer <NUM> is provided, the organic film layer <NUM> may be cured through thermal curing, photo-curing, or thermal curing in combination with photo-curing.

For example, the method of manufacturing the organic film layer <NUM> is the ink jet printing (IJD) method. The ink jet printing method may reduce the material cost of manufacturing the organic film layer <NUM> and improve production efficiency of the organic film layer <NUM>.

On this basis, by arranging at least one blocking dam <NUM> around the organic film layer <NUM>, it may effectively block the overflow of the material of the organic film layer when the organic film layer <NUM> is prepared by the ink jet printing method.

In some embodiments, as shown in <FIG>, the insulating film layers of the display substrate <NUM> (such as the planarization layer <NUM>, the photo spacer <NUM> and the pixel definition layer <NUM>) are formed; meanwhile, the blocking dam <NUM> is formed layer by layer through processes such as etching. That is, the blocking dam <NUM> includes one or more of materials of the insulating film layers, such as a material of the planarization layer, a material of the pixel definition layer, and a material of the photo spacer.

In some examples, as shown in <FIG>, a width W of the blocking dam <NUM> is <NUM> to <NUM>, and a height H of the blocking dam <NUM> is <NUM> to <NUM>. For example, the planarization layer <NUM>, the pixel definition layer <NUM> and the photo spacer <NUM> are formed; meanwhile, the blocking dam <NUM> is formed. The material of the planarization layer <NUM> is an acrylic material (PMMA, chemical name of which is polymethyl methacrylate), and a thickness of the planarization layer <NUM> is <NUM> to <NUM>. The material of the pixel definition layer <NUM> is polyimide, and a thickness of the pixel definition layer <NUM> is <NUM> to <NUM>. The material of the photo spacer <NUM> is polyimide, and a thickness of the photo spacer may be <NUM> to <NUM>. Therefore, a height H of the blocking dam <NUM> is <NUM> to <NUM>.

In some examples, as shown in <FIG>, the width W of the blocking dam <NUM> is <NUM> to <NUM>, and the height H of the blocking dam <NUM> is <NUM> to <NUM>.

In some examples, the blocking dam <NUM> is formed through a photolithography process. In a case where the blocking dam <NUM> is formed by stacking some film layers (for example, a film layer in the planarization layer, a film layer in the pixel definition layer, etc.), and during the forming of each film layer of the blocking dam <NUM>, first, a corresponding layer is coated with a photosensitive organic material (such as photoresist); then, a mask with corner pattern(s) to be formed is used to expose and develop the coating of the photosensitive organic material, so as to make the coating of the photosensitive organic material have the corner pattern(s) to be formed; afterwards, the coating of the photosensitive organic material is used for the etching of the corresponding layer, so as to make the corresponding layer form the corner(s) of the blocking dam <NUM> that are to be formed and are rounded corner(s) or in an embodiment not forming part of the claimed invention, substantially rounded corner(s).

In some other examples, in the case where the blocking dam <NUM> is formed by stacking some film layers (for example, a film layer in the planarization layer, a film layer in the pixel definition layer, etc.), and when each film layer of the blocking dam <NUM> is formed, film layers (including the corresponding film layer in the blocking dam <NUM>) having different thicknesses may be formed in different regions of the display substrate through a gray tone mask technology (or a half tone mask technology), so that the thickness of the corresponding film layer in the blocking dam <NUM> is different from the thickness of film layer in other region of the display substrate. For example, the half tone mask technology is used to form the pixel definition layer having a thickness of X in the display region AA and the corresponding film layer in the blocking dam <NUM> having a thickness of Y in the bezel region BB. In this way, the height of the blocking dam <NUM> may be controlled precisely, and additional process steps may be reduced.

In some embodiments, as shown in <FIG> and <FIG>, a shape of the display substrate <NUM> is a rectangle. In the claimed invention, a radius Rd of the rounded corner of the blocking dam <NUM> satisfies: <MAT>.

Where L is the length of the diagonal of the display substrate <NUM>, and α<NUM> is a coefficient related to the length of the diagonal of the display substrate <NUM>.

In some embodiments, a value of α<NUM> is positively related to the length of the diagonal of the display substrate <NUM>. That is, the longer the length of the diagonal of the display substrate <NUM> is, the greater the value of α<NUM> is. For example, the value of α<NUM> is <NUM> to <NUM> times the length of the diagonal of the display substrate <NUM>. For example, the value of α<NUM> is <NUM> times the length of the diagonal of the display substrate <NUM>. It will be noted that the present disclosure does not limit the length of the diagonal of the display substrate <NUM> and the unit of the length. For example, the length of the diagonal of the display substrate <NUM> is <NUM> to <NUM> (for example, the length of the diagonal of the display substrate <NUM> is <NUM> to <NUM>).

Herein, as shown in <FIG>, the blocking dam <NUM> has a certain width, so the corner of the blocking dam <NUM> may be a corner of the central axis of the blocking dam <NUM> in circumferential direction (shown by the dotted lines in <FIG>). For example, in the claimed invention, where the corner of the blocking dam <NUM> is a rounded corner, the radius Rd of the rounded corner is a radius of the corner of the central axis of the blocking dam <NUM>. For another example, in the claimed invention, where the corner of the blocking dam <NUM> is a rounded corner, the radius Rd of the rounded corner is a radius of a rounded corner defined by an inner edge of the blocking dam <NUM> or a radius of a rounded corner defined by an outer edge of the blocking dam <NUM>.

In the claimed invention, the value range of α<NUM> is <NUM> ≤ α<NUM> ≤ <NUM>. For example, the length of the diagonal of the display substrate <NUM> is <NUM> to <NUM>. According to a relationship between the value of α<NUM> and the length of the diagonal of the display substrate <NUM> (for example, the value of α<NUM> is <NUM> times the length of the diagonal of the display substrate <NUM>), the value range of α<NUM> is <NUM> ≤ α<NUM> ≤ <NUM>.

For example, the length L of the diagonal of the display substrate <NUM> is <NUM>, the value of α<NUM> is <NUM>, and the radius Rd of the corner of the at least one blocking dam <NUM>, which is a rounded corner, is <NUM>. Or, the length L of the diagonal of the display substrate <NUM> is <NUM>, the value of α<NUM> is <NUM>, and the radius Rd of the rounded corner of the at least one blocking dam <NUM>, which is a rounded corner, is <NUM>. Or, the length L of the diagonal of the display substrate <NUM> is <NUM>, the value of α<NUM> is <NUM>, and the radius Rd of the rounded corner of the at least one blocking dam <NUM>, which is a rounded corner, is <NUM>.

In some examples, the blocking dam <NUM> has a plurality of corners, and at least one of the plurality of corners is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner For example, the shape of the display substrate is a rectangle, and the edge of the blocking dam <NUM> has four corners. One, two, three, or all of the four corners are rounded corner(s) or in an embodiment not forming part of the claimed invention, substantially rounded corner(s). The embodiments of the present disclosure do not limit the number of rounded corners (or in an embodiment not forming part of the claimed invention, substantially rounded corners) of the edge of the blocking dam <NUM>. Some embodiments and drawings of the present disclosure illustrate that all corners of the edge of the blocking dam <NUM> are rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners.

In some embodiments, as shown in <FIG>, at the same corner position of the display substrate <NUM>, the corner of the edge of the encapsulation film <NUM> and the corner of the blocking dam <NUM> are rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners. The radius of the rounded corner of the edge of the encapsulation film <NUM> is greater than the radius of the rounded corner of the blocking dam <NUM>. Therefore, the encapsulation film <NUM> has a certain width at a side of the blocking dam <NUM> farthest from the center of the display substrate <NUM>, which may ensure that the encapsulation film <NUM> has a good encapsulation effect. Herein, the center of the display substrate <NUM> is an intersection of two diagonals in a case where the shape of display substrate <NUM> is a rectangle.

In the claimed invention, at the same corner position of the display substrate <NUM>, the corner of the edge of the encapsulation film <NUM> and the corner of the blocking dam <NUM> are rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners; and in a case where a radius RF of the rounded corner of the edge of the encapsulation film <NUM> satisfies RF=L×α<NUM>, and the radius Rd of the rounded corner of the blocking dam <NUM> satisfies Rd=L×α<NUM>, α<NUM>>α<NUM>. In a case where the corner of the edge of the encapsulation film <NUM> and the corner of the blocking dam <NUM> are rounded corners, the radius of the rounded corner of the edge of the encapsulation film <NUM> is greater than the radius of the corner of the blocking dam <NUM>. In this way, the encapsulation film <NUM> has a certain width at a side of the blocking dam <NUM> farthest from the center of the display substrate <NUM>, which may ensure that the encapsulation film <NUM> has a good encapsulation effect.

In the claimed invention, at the same corner position of the display substrate <NUM>, the radius of the rounded corner of the edge of the encapsulation film <NUM> is <NUM> to <NUM> times the radius of the rounded corner of the blocking dam <NUM>. In this way, the blocking dam <NUM> may effectively block the ink overflow when the organic film layer <NUM> is prepared by the ink jet printing method, and it is ensured that the encapsulation film <NUM> has a larger width at a side of the blocking dam <NUM> farthest from the center of the display substrate <NUM>, and the encapsulation film <NUM> may have a better encapsulation effect.

In some embodiments, the number of the at least one blocking dams <NUM> is multiple. At the same corner position of the display substrate <NUM>, corners of the blocking dams <NUM> are all rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners. Moreover, in a radial direction of the rounded corner of the blocking dam <NUM> and in a direction from the center of the display substrate <NUM> to the blocking dam <NUM>, the radii of the rounded corners of the blocking dams <NUM> sequentially increase. In this way, there may be a certain width between the blocking dams <NUM>, which may effectively block the overflow of the material of the organic film layer when the organic film layer <NUM> is prepared by the ink jet printing method.

For example, the number of the at least one blocking dam <NUM> is two. As shown in <FIG>, the display substrate <NUM> includes a first blocking dam <NUM> and a second blocking dam <NUM>, and the second blocking dam <NUM> is disposed at the periphery of the first blocking dam <NUM>. Each corner of the first blocking dam <NUM> and each corner of the second blocking dam <NUM> are rounded corners or in an embodiment not forming part of the claimed invention, substantially rounded corners. The arrangement of two blocking dams <NUM> may effectively block the organic film layer <NUM> without significantly increasing a width of the bezel region BB of the display substrate <NUM>.

In some embodiments, a radius of the rounded corner of the first blocking dam <NUM> is <NUM> to <NUM>, and a radius of the rounded corner of the second blocking dam <NUM> is <NUM> to <NUM>. Each corner of the edge of the encapsulation film <NUM> is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner, and the radius of the rounded corner of the edge of the encapsulation film <NUM> is <NUM> to <NUM>. For example, the radius of the rounded corner of the first blocking dam <NUM> is <NUM>, the radius of the rounded corner of the second blocking dam <NUM> is <NUM>, and the radius of the rounded corner of the edge of the encapsulation film <NUM> is <NUM>. Or, the radius of the rounded corner of the first blocking dam <NUM> is <NUM>, the radius of the rounded corner of the second blocking dam <NUM> is <NUM>, and the radius of the rounded corner of the edge of the encapsulation film <NUM> is <NUM>. Or, the radius of the rounded corner of the first blocking dam <NUM> is <NUM>, the radius of the rounded corner of the second blocking dam <NUM> is <NUM>, and the radius of the rounded corner of the edge of the encapsulation film <NUM> is <NUM>.

In some embodiments, as shown in <FIG>, the encapsulation film <NUM> further includes at least two inorganic film layers. The inorganic film layers and the organic film layer(s) <NUM> are alternately stacked. In the encapsulation film <NUM>, both a film layer closest to the base substrate <NUM> and a film layer farthest from the base substrate <NUM> are inorganic film layers. At least two inorganic film layers cover the at least one blocking dam <NUM>.

In some embodiments, a material of the inorganic film layer is a material that may block moisture and oxygen. It is ensured that the encapsulation film <NUM> may prevent the invasion of moisture and oxygen, and thereby it is ensured that the encapsulation film <NUM> has a good sealing effect. For example, the material of the inorganic film layer is silicon nitride (SiNx), silicon dioxide (SiO2), silicon oxynitride (SiON) or aluminum oxide (AlOx).

In some embodiments, a thickness of the inorganic film layer is <NUM> to <NUM>. For example, the thickness of the inorganic film layer is <NUM>, <NUM>, <NUM> or <NUM>.

In some embodiments, a method of manufacturing the inorganic film layer is a chemical vapor deposition (CVD) method, a physical vapor deposition (PVD) method or an atomic layer deposition (ALD) method.

In some examples, the edge of the encapsulation film <NUM> is an edge of an inorganic film layer. Since at least one corner of the edge of the encapsulation film <NUM> is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner, at least one corner of the edge of the inorganic film layer is a rounded corner or in an embodiment not forming part of the claimed invention, a substantially rounded corner.

In some examples, the inorganic film layer is manufactured through the photolithography process. During the manufacturing of the inorganic film layer, first, the inorganic film layer is coated with a photosensitive organic material (such as photoresist); then, a mask with corner pattern(s) to be formed is used to expose and develop the coating of the photosensitive organic material, so that the coating of the photosensitive organic material has the corner pattern(s) to be formed; afterwards, the coating of the photosensitive organic material is used for the etching of the inorganic film layer, so that the corner(s) of the edge of the inorganic film layer are formed to be rounded corner(s) or in an embodiment not forming part of the claimed invention, substantially rounded corner(s).

In some other examples, during the manufacturing of the inorganic film layer, film layers (including the inorganic film layer) having different thicknesses may be formed in different regions of the display substrate through the gray tone mask technology (or the half tone mask technology). In this way, the thickness of the inorganic film layer may be controlled precisely, and shape(s) of the corner(s) of the edge of the inorganic film layer that are rounded corner(s) or in an embodiment not forming part of the claimed invention, substantially rounded corner(s) may be controlled precisely, and additional process steps may be reduced.

In some embodiments, the encapsulation film <NUM> has a structure of at least three layers. With respect to an encapsulation film <NUM> having a certain number of layers, both a film layer closest to the base substrate <NUM> and a film layer farthest from the base substrate <NUM> are inorganic film layers, so that the encapsulation film <NUM> plays a role of blocking moisture and oxygen. In addition, the inorganic film layers and the organic film layer(s) are alternately stacked, so as to realize the flexible function of the organic film layer in the encapsulation film <NUM> and the display substrate <NUM>. Some embodiments of the present disclosure do not limit the number of film layers in the encapsulation film <NUM>, and the description will be made below by taking an example in which the encapsulation film <NUM> has a three-layer structure.

For example, the encapsulation film <NUM> includes one organic film layer and two inorganic film layers. As shown in <FIG>, the encapsulation film <NUM> includes a first inorganic film layer <NUM>, an organic film layer <NUM> and a second inorganic film layer <NUM> that are alternately stacked on top of one another. In the encapsulation film <NUM>, the first inorganic film layer <NUM> is closest to the base substrate <NUM>, the second inorganic film layer <NUM> is farthest from the base substrate <NUM>, and the organic film layer <NUM> is located between the first inorganic film layer <NUM> and the second inorganic film layer <NUM>.

In some embodiments, each inorganic film layer of the encapsulation film <NUM> covers each blocking dam <NUM>. That is, the blocking dam <NUM> is located on a side of the encapsulation film <NUM> proximate to the base substrate <NUM>. An orthographic projection of the blocking dam <NUM> on the base substrate <NUM> is within a range of an orthographic projection of the encapsulation film <NUM> on the base substrate <NUM>.

In some embodiments, the encapsulation film <NUM> further includes at least one buffer organic layer. The at least one buffer organic layer is disposed between the inorganic film layer and the organic film layer that are adjacent. An orthographic projection of the buffer organic layer on the base substrate <NUM> is within a range of an orthographic projection of the organic film layer on the base substrate <NUM>. Or, the orthographic projection of the buffer organic layer on the base substrate <NUM> coincides with the orthographic projection of the organic film layer on the base substrate <NUM>. The buffer organic layer is beneficial to reduce a difference between the inorganic film layer and the organic film layer. The difference refers to the difference in density, structure, adhesion, stress, etc. between different film layers.

For example, as shown in <FIG>, a buffer organic layer <NUM> is disposed between the first inorganic film layer <NUM> and the organic film layer <NUM>, and there is no buffer organic layer between the organic film layer <NUM> and the second inorganic film layer <NUM>. Or, a buffer organic layer <NUM> is disposed between the first inorganic film layer <NUM> and the organic film layer <NUM>, and a buffer organic layer <NUM> is disposed between the organic film layer <NUM> and the second inorganic film layer <NUM>. Some embodiments of the present disclosure do not limit the number of the buffer organic layers.

In some examples, a method of manufacturing the buffer organic layer is the same as the method of manufacturing the inorganic film layer. Or, the method of manufacturing the buffer organic layer is the same as a method of manufacturing the organic film layer. In a case where the buffer organic layer and the inorganic film layer are manufactured through the same method, the buffer organic layer and the inorganic film layer may be manufactured in a same process chamber. In a case where the buffer organic layer and the organic film layer are manufactured through the same method, the buffer organic layer and the organic film layer may be manufactured in a same process chamber. Herein, the process chamber is a vacuum device for manufacturing the film layers, and methods of manufacturing different film layers correspond to different process chambers. Therefore, the method of manufacturing the buffer organic layer may be selected according to the scheduling situation of the equipment in the production line. In this way, processes may be continuous, time for transferring and aligning the substrate may be reduced, and there are no undesirable defects in an interface between the film layers, thereby obtaining better films.

For example, after the first inorganic film layer <NUM> is manufactured, when the buffer organic layer <NUM> is to be manufactured, the process chamber for manufacturing the buffer organic layer <NUM> is determined according to the scheduling situation of the equipment in the production line. For example, according to the scheduling situation of the equipment in the production line, if a time interval between the manufacturing of the first inorganic film layer <NUM> and the manufacturing of the organic film layer <NUM> is short, the buffer organic layer <NUM> is manufactured in a process chamber where the first inorganic film layer <NUM> is manufactured. If the time interval between the manufacturing of the first inorganic film layer <NUM> and the manufacturing of the organic film layer <NUM> is long, the buffer organic layer <NUM> is manufactured in a process chamber where the organic film layer <NUM> is manufactured. Therefore, it may be ensured that the time interval between the manufacturing of the buffer organic layer and the manufacturing of the organic film layer is short, and a surface of the buffer organic layer <NUM> has a good characteristic of a contact angle. Herein, the contact angle is a measurement of a wetness degree of the film layer.

In some embodiments, when the buffer organic layer <NUM> is manufactured, plasma (for example, oxygen-containing plasma, and fluorine-containing plasma) is injected into the process chamber for manufacturing the buffer organic layer <NUM> to solidify the buffer organic layer <NUM>, thereby achieving precise and timely control on surface characteristics of the films.

In some examples, in a case where the buffer organic layer <NUM> is manufactured through the ink jet printing method, and the buffer organic layer <NUM> is cured, regional operation is performed on the buffer organic layer <NUM>. For example, a concentration of plasma injected to a central region of the buffer organic layer <NUM> is higher than a concentration of plasma injected to an edge region of the buffer organic layer <NUM>, thereby preventing the edge of the ink in the ink jet printing process from being uneven and flowing. Or, the oxygen-containing plasma is injected to the central region of the buffer organic layer <NUM>, and the fluorine-containing plasma is injected to the edge region of the buffer organic layer <NUM>. Due to the good hydrophilicity of the oxygen-containing plasma and the good hydrophobicity of the fluorine-containing plasma, that the edge of the ink in the ink jet printing process is uneven and flowing may be prevented.

In some embodiments, a thickness of the buffer organic layer is relatively thin. For example, the thickness of the buffer organic layer is <NUM> to <NUM>. The thin buffer organic layer may reduce the difference between the inorganic film layer and the organic film layer; moreover, in the manufacturing process, the deposition time of the thin buffer organic layer is short, and it is beneficial for cleaning the mask used for evaporating the buffer organic layer.

In some embodiments, a material of the buffer organic layer is plasma-polymerization hexamethyldisiloxane (HMDSO).

In some embodiments, the encapsulation film <NUM> further includes a barrier layer <NUM>. The barrier layer <NUM> covers the inorganic film layer farthest from the base substrate <NUM>. A material of the barrier layer <NUM> is a flexible material to protect the entire encapsulation structure. For example, the material of the barrier layer <NUM> is polyethylene terephthalate (PET) or poly(ethylene naphthalate) (PEN).

Some embodiments of the present disclosure provide a display apparatus <NUM>. As shown in <FIG>, the display apparatus <NUM> includes the display substrate <NUM> provided by any of the foregoing embodiments. In addition, in some examples, the display apparatus <NUM> further includes a mainboard coupled to the display substrate <NUM>. The mainboard is configured to control the display apparatus <NUM> to make the display apparatus realize various functions. In some other examples, the display apparatus <NUM> may include a touch screen to be used in conjunction with the display substrate <NUM>, and the touch screen is configured to realize operations to the display apparatus <NUM>.

For example, the display apparatus <NUM> is an OLED display apparatus, an AMOLED display apparatus, a Micro-LED display apparatus, a Mini-LED display apparatus, etc..

For example, the display apparatus may be any apparatus that displays moving images (for example, a video), fixed images (for example, a static image), content or graphical images. More specifically, it is anticipated that the described embodiments may be implemented in or associated with a plurality of electronic devices. The plurality of the electronic devices may include but not limit to: mobile phones, wireless devices, portable android devices (PAD), hand-held or portable computers, global positioning system (GPS) receivers/navigators, cameras, moving picture experts group <NUM> (MP4) video players, video cameras, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, car displays (e.g., an odometer display, etc.), navigators, displays for camera view (e.g., a display for a rear view camera in a vehicle), electronic photos, electronic billboards or direction boards, projectors, building structures, packaging and aesthetic structures (e.g., a display for an image of a piece of jewelry), etc..

The beneficial effects achieved by the display apparatus <NUM> provided by the embodiments of the present disclosure are the same as the beneficial effects achieved by the display substrate <NUM>, which will not be described herein again.

Claim 1:
A display substrate (<NUM>), comprising:
a base substrate (<NUM>), and
an encapsulation film (<NUM>) disposed at a first side (a) of the base substrate (<NUM>), wherein at least one corner of an edge of the encapsulation film (<NUM>) is a rounded corner;
a radius RF of the rounded corner of the edge of the encapsulation film (<NUM>) satisfies: <MAT>
where L is a length of a diagonal of the display substrate (<NUM>), and α<NUM> is a coefficient related to the length (L) of the diagonal of the display substrate (<NUM>);
the encapsulation film (<NUM>) includes at least one organic film layer (<NUM>);
the display substrate (<NUM>) has a display region (AA) and a bezel region (BB) surrounding the display region (AA), the display substrate (<NUM>) further comprises at least one blocking dam (<NUM>) disposed at the first side (a) of the base substrate (<NUM>) in the bezel region (BB), the at least one blocking dam (<NUM>) is disposed around the at least one organic film layer (<NUM>), and each blocking dam (<NUM>) of the at least one blocking dam (<NUM>) is configured to block the at least one organic film layer (<NUM>); and
at least one corner of the blocking dam (<NUM>) is a rounded corner;
a radius Rd of the rounded corner of the blocking dam (<NUM>) satisfies: <MAT>
where L is a length of a diagonal of the display substrate (<NUM>), and α<NUM> is a coefficient related to the length (L) of the diagonal of the display substrate (<NUM>);
characterized in that
a value range of α<NUM> is <NUM> ≤ α<NUM> ≤ <NUM>;
a value range of α<NUM> is <NUM> ≤ α<NUM> ≤ <NUM>;
at a same corner position of the display substrate (<NUM>), a corner of the edge of the encapsulation film (<NUM>) and a corner of the blocking dam (<NUM>) are rounded corners; and
in a case where a radius RF of the rounded corner of the edge of the encapsulation film (<NUM>) satisfies RF = L × α<NUM>, and the radius Rd of the rounded corner of the blocking dam (<NUM>) satisfies Rd = L × α<NUM>, α<NUM>>α<NUM>; or
at the same corner position of the display substrate (<NUM>), a corner of the edge of the encapsulation film (<NUM>) and a corner of the blocking dam (<NUM>) are rounded corners, and a radius of the rounded corner of the edge of the encapsulation film (<NUM>) is <NUM> to <NUM> times a radius of the rounded corner of the blocking dam (<NUM>).