Patent ID: 12219794

DETAILED DESCRIPTION

Hereinafter, the technical solutions in embodiments of the present disclosure are described clearly and completely in conjunction with drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part of embodiments of the present disclosure, rather than all the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present disclosure, without creative efforts, shall fall within the scope of the present disclosure.

Embodiments of the present disclosure provide a display substrate, including a base film layer and a functional film layer. As shown inFIG.1aandFIG.1b, the display substrate includes a plurality of partial display regions. As shown inFIG.2aandFIG.2b, the partial display region is provided with a plurality of hole-forming areas, and the plurality of hole-forming areas divide an island area for displaying and a bridge area for signal transmission. The plurality of hole-forming areas are arranged around the island area. One part of the bridge area is located between the island area and the hole-forming area and the other part of the bridge area is located between the hole-forming areas. The display substrate further includes a separation structure located in the bridge area.

The separation structure is located on the base film layer for separating a target functional film layer to form a first part and a second part. The target function film layer includes any functional film layer formed at a side of the separation structure away from the base film layer, the first part includes a part of the target functional film layer that is located at a side of the separation structure away from the hole-forming area, and the second part includes a part of the target functional film layer that is located at a side of the separation structure near the hole-forming area.

In the embodiments of the present disclosure, since the separation structure is located in the bridge area, and because the bridge area is located between the hole-forming area and the island area, that is, the first part separated from the second part by the separation structure includes a part of the target functional film layer located in the island area, and the second part includes a part of the target functional film layer near the hole-forming area that is intruded by water and oxygen. By dividing the target functional film layer into two parts that are separated from each other, the water and oxygen in the second part can be prevented from intruding into the first part, that is, it can be ensured that water and oxygen cannot intrude the part of the target functional film layer located in the island area, thereby ensuring normal display of the display device. Therefore, the technical solution provided by the present disclosure can ensure normal display of the display device.

In the embodiments of the present disclosure, the shape of the display substrate is not limited. For example, when the display substrate is a rectangular display substrate, as shown inFIG.1a, the rectangular display substrate may have four partial display regions110, and each partial display region110is provided with a plurality of hole-forming areas I (as shown inFIG.2a). The four partial display regions may be at four corner regions of the rectangular display substrate, as shown inFIG.1a, or may also at four frame regions of a rectangular display substrate, or may also include two corner regions and two frame regions. For another example, when the display substrate is a triangular display substrate, as shown inFIG.1B, the triangular display substrate has three partial display regions110, and each partial display region110is provided with a plurality of hole-forming areas I. The three local display regions may be at three corner regions of the triangular display substrate, as shown inFIG.1B.

In the embodiments of the present disclosure, a structural unit including the hole-forming area I, the bridge area II and the island area III in the partial display region110is shown inFIG.2a. The hole-forming area I includes a via-hole that extends through the functional film layer and the base film layer; the bridge area II includes signal traces for signal transmission; and the island area III includes display components, which are electrically connected with the signal traces for light-emitting display. The hole-forming area I may be arranged in an “H”-shaped structure in the partial display region.

It should be noted that the hole-forming area I, the bridge area II and the island area III are repetitively arranged.FIG.2ashows only one structural unit for repetitive arrangement; as shown inFIG.2b, a plurality of structural units as shown inFIG.2amay be repeatedly arranged in the partial display region, for example, there are 4 structural units repeatedly arranged.

The plurality of hole-forming areas I are openly arranged around the island area III. As shown inFIG.2a, the island area III includes four directions, and four hole-forming areas I occupy parts in the four directions respectively, so that signal traces in the bridge area II can be electrically connected to the display components in the island area III. Optionally, the separation structure210is located in the bridge area II at a position near the hole-forming area I, and the separation structure210is represented by a dashed line inFIG.2aandFIG.2b.

The separation structure210is located in the bridge area II. Specifically, the separation structure210is located in the bridge area II between two hole-forming areas I, and is also located in the bridge area II between the hole-forming area I and the island area III. The separation structure210is shown by the dashed line inFIG.2.

An outline of an orthographic projection of each separation structure210onto the base film layer is a closed pattern and is the same as a boundary pattern of the hole-forming area I, thereby ensuring that the separation structure210prevents water and oxygen from intruding the island area III from the hole-forming area I at each position.

The separation structure210is located on the base film layer for separating a target functional film layer to form a first part and a second part, and the target function film layer is any functional film layer formed at a side of the separation structure away from the base film layer, and the target functional film layer is a display film layer.

By dividing the target functional film into a first part and a second part that are separated from each other, when the second part near the hole-forming area I is intruded by water and oxygen, the first part located in the island area III will be not intruded by water and oxygen because the first part is separated from the second part, thereby ensuring the normal operation of the target functional film in the island area III and then ensuring the normal display of the display device.

Each separation structure210is a closed structure with a head thereof being connected to an end thereof. The separation structure210is arranged around the hole-forming area I.

In this embodiment, each separation structure210is a closed structure. By arranging the separation structure210around the hole-forming area I, it is possible to prevent the water and oxygen intruded from the hole-forming area I from passing through the separation structure210into the island area III, thereby ensuring the water and oxygen blocking effect of the island area III.

Further, N separation structures210are arranged around one hole-forming area, where N is equal to 1, 2 or 3.

Each hole-forming area I is surrounded by at least one separation structure210to prevent water and oxygen in the hole-forming area I from intruding the island area III. The greater the number of separation structures210that surround the hole-forming area I, the better the effect of preventing water and oxygen from intruding the island area III, but at the same time the larger the space of the bridge area II occupied by the separation structures210. By designing the number of separation structures210surrounding one hole-forming area I to be 1, 2 or 3, the space occupied by the separation structures210in the bridge area II can be reduced while ensuring the water and oxygen blocking effect of the island area III.

At least two separation structures210surrounding an identical hole-forming area I have a same direction, i.e., having an identical contour shape, and a contour length is proportional to a distance from each separation structure210to the hole-forming area I. The at least two separation structures210surrounding the identical hole-forming area I are arranged being concentric with a center of the hole-forming area I.

Further, as shown inFIG.3andFIG.4, the bridge area II includes first-layer signal traces420, a first planarization layer430, and second-layer signal traces440that are sequentially arranged in a direction away from the base film layer410. The first planarization layer430is located between the first-layer signal traces420and the second-layer signal traces440. The number of the second-layer signal traces440is not greater than the number of the first-layer signal traces420.

In this embodiment, the number of the first-layer signal traces420may be equal to or greater than the number of the second-layer signal traces440.

The first-layer signal trace420and the second-layer signal trace440may be arranged directly opposite, that is, an orthographic projection of the first-layer signal trace420onto the base film layer410coincides with an orthographic projection of the second-layer signal trace440onto the base film layer410. The first-layer signal trace420and the second-layer signal trace440may also be arranged in a staggered manner, that is, an orthographic projection of one first-layer signal trace420onto the base film layer is located between two orthographic projections of two adjacent the second-layer signal traces440onto the base film layer410.

Signals transmitted by the first-layer signal trace420and the second-layer signal trace440may be the same or different. In a case that the signals transmitted by the first-layer signal trace420and the second-layer signal trace440are the same, the first-layer signal trace420and the second-layer signal trace440may be connected through a via-hole in the island area and/or the bridge area.

Further, the separation structure is located at a side of the first-layer signal trace420away from the base film layer410.

That is to say, the separation structure will not occupy a layout space of the first-layer signal traces420in the bridge area II, but there may be a situation in which the separation structure may occupy a layout space of the second-layer signal traces440in the bridge area II, resulting in that the number of the second-layer signal traces440is smaller than the number of the first-layer signal traces420.

In an optional implementation of the present disclosure, as shown inFIG.3, the separation structure in the bridge area II is located on the first planarization layer430and between the second-layer signal traces440and the hole-forming area I, and the number of the first-layer signal traces420is greater than the number of the second-layer signal traces440.

As shown inFIG.3, the second-layer signal traces440and the separation structure are both arranged on the first planarization layer430. Since the layout space in the bridge area II is limited, the layout of the separation structure reduces the layout space of the second-layer signal traces440, so that the number of second-layer signal traces440is reduced, which is smaller than the number of first-layer signal traces420that has not reduced in layout space.

Further, the separation structure includes a separation column451, as shown inFIG.5, the separation column includes a first structure510and a second structure520arranged in a direction perpendicular to the base film layer. The first structure510is located between the second structure520and the base film layer410. An orthographic projection of the first structure510onto the base film layer410is located inside an orthographic projection of the second structure520onto the base film layer410.

After the separation column is formed on the first flat layer430, a target functional film layer subsequently formed at a side of the separation column away from the substrate film layer410will be divided into a first part610and a second part620separated with each other, as shown inFIG.6. The first part610includes a part of the target functional film layer located at a side of the separation structure away from the hole-forming area I, and the second part620includes a part of the target functional film layer located at a side of the separation structure close to the hole-forming area I. In this way, when water and oxygen intrude the second part620of the target functional film layer, the water and oxygen will not intrude into the first part610through the second part620, so that functionality of the first part610of the target functional film layer will not be damaged, thereby ensuring normal display of the island area.

It should be noted that the separation column451is not limited to the first structure510and the second structure520, but may further include a third structure530. The third structure530may located at a side of the first structure510away from the second structure520, so that the separation column451has an “H”-shaped structure. At this point, the first structure510and the second structure520of the separation column can also divide the target functional film layer into the first part610and the second part620that are separated with each other, thereby preventing water and oxygen from intruding the first part610from the second part620.

Further, materials of the separation column451and the second-layer signal traces440are the same.

The separation column451and the second-layer signal traces440are both located on the first planarization layer430, and since the materials of the separation column451and the second-layer signal traces440are the same, the separation column451and the second-layer signal traces440can be simultaneously manufactured on the first planarization layer when manufacturing the display substrate, thereby improving a manufacturing efficiency of the display substrate.

In another optional implementation of the present disclosure, as shown inFIG.4, the bridge area II further includes a second planarization layer460covering the second-layer signal traces440, and the separation structure is located at a side of the second-layer signal traces440away from the base film layer410. The number of the first-layer signal traces420is equal to the number of the second-layer signal traces440.

Since the separation structure is located at the side of the second-layer signal traces440away from the base film layer410, that is, the separation structure does not affect the layout space of the second-layer signal traces440, and thus the second-layer signal traces440and the first-layer signal traces420have the same layout space, and then the second-layer signal traces440and the first-layer signal traces420have the same number of traces.

In this embodiment, since the separation structure does not affect the layout space of the first-layer signal traces420and the second-layer signal traces440, intervals between the signal traces in the bridge area II under the same number of traces can be larger, that is, density of traces is reduced, thereby avoiding crosstalk between adjacent traces, and increasing reliability of the traces of the high pixel density (PPI) display device in the bridge area II.

Further, the bridge area II further includes a passivation layer470arranged on the second planarization layer460, and the separation structure includes an separation groove452that extends through the passivation layer470and a part of the second planarization layer460. An orthographic projection of an opening of the separation groove452onto the base film layer410is located inside an orthographic projection of the separation groove452onto the base film layer410.

In this embodiment, the passivation layer470is an inorganic layer, which can prevent the water and oxygen at a side close to the base film layer410from directly penetrating through the passivation layer470and intruding the functional film layer at a side of the passivation layer470away from the base film layer410.

In this embodiment, a part of the second planarization layer460close to the base film layer410is used to cover the second-layer signal traces440, and the other part of the second planarization layer460is used to form the separation groove452together with the passivation layer470.

As shown inFIG.7, a size of the opening of the separation groove452in a transverse direction of a paper whereFIG.7is located, is smaller than a distance between two oppositely arranged groove walls of the separation groove452in the transverse direction of a paper whereFIG.7is located. The opening of the separation groove452is an opening in a face of the passivation layer470away from the base film layer410.

An orthographic projection of a via-hole that extends through the passivation layer470onto the substrate film layer410, coincides with an orthographic projection of one of the separation grooves formed in the second planarization layer460onto the substrate film layer410.

After the second planarization layer460and the passivation layer470together form the separation groove452, a target functional film layer subsequently formed at a side of the separation groove452away from the base film layer410will be divided into a first part610and a second part620that are separated with each other at the opening, as shown inFIG.8. The first part610includes a part of the target functional film layer that is located at a side of the separation groove away from the hole-forming area I. The second part620includes a part of the target functional film layer that is located at a side of the separation groove near the hole-forming area I. In this way, when water and oxygen intrude the second part620of the target functional film layer, the water and oxygen will not intrude into the first part610through the second part620, so that the functionality of the first part610of the target functional film layer will not be damaged, thereby ensuring normal display of the island area III.

Further, an orthographic projection of the second-layer signal trace440onto the base film layer410does not coincide with the orthographic projection of the opening onto the base film layer410.

By designing the second-layer signal traces440and the opening in a staggered manner, it is possible to avoid damaging the second-layer signal traces440due to excessive etching in the process of forming the separation groove452, thereby improving the reliability and process yield of the display substrate.

In a high PPI display device, when there are many traces in the bridge area II, an orthographic projection of one separation groove452onto the base film layer410may partially overlap each of two orthographic projections of two adjacent second-layer signal traces onto the base film layer410.

One embodiment of the present disclosure further provides a display device which includes the foregoing display substrate.

The display device may be a monitor, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, etc.

One embodiment of the present disclosure further provides a method of manufacturing a display substrate, which includes:

providing a flexible base film layer, where the flexible base film layer includes a plurality of hole-forming areas defined in a partial display region, and the plurality of hole-forming areas divide an island area for displaying and a bridge area for signal transmission, the plurality of hole-forming areas are arranged around the island area, a part of the bridge area is located between the island area and the hole-forming area, and the other part of the bridge area is located between the hole-forming areas;

forming a separation structure on the flexible base film layer, where the separation structure is located in the bridge area;

forming a target functional film layer covering the separation structure, where the separation structure separates the target functional film layer to form a first part and a second part that are separated with each other, the first part includes a part of the target functional film layer that is located at a side of the separation structure away from the hole-forming area, and the second part includes a part of the target functional film layer that is located at a side of the separation structure near the hole-forming area.

In the embodiments of the present disclosure, since the separation structure is located in the bridge area, and because the bridge area is located between the hole-forming area and the island area, that is, the first part separated from the second part by the separation structure includes a part of the target functional film layer located in the island area, and the second part includes a part of the target functional film layer near the hole-forming area that is easily intruded by water and oxygen. By dividing the target functional film layer into two parts that are separated from each other, the water and oxygen in the second part can be prevented from intruding into the first part, thereby ensuring that water and oxygen cannot intrude the part of the target functional film layer located in the island area, and then ensuring normal display of the display device. Therefore, the technical solution provided by the present disclosure can ensure normal display of the display device.

In the embodiments of the present disclosure, the shape of the display substrate is not limited. For example, when the display substrate is a rectangular display substrate, as shown inFIG.1a, the rectangular display substrate may have four partial display regions110, and each partial display region110is provided with a plurality of hole-forming areas I (as shown inFIG.2a). The four partial display regions may be at four corner regions of the rectangular display substrate, as shown inFIG.1a, or may also at four frame regions of a rectangular display substrate, or may also include two corner regions and two frame regions. For another example, when the display substrate is a triangular display substrate, as shown inFIG.1b, the triangular display substrate has three partial display regions110, and each partial display region110is provided with a plurality of hole-forming areas I. The three local display regions may be at three corner regions of the triangular display substrate, as shown inFIG.1b.

In the embodiments of the present disclosure, a structural unit including the hole-forming area I, the bridge area II and the island area III in the partial display region110is shown inFIG.2a. The hole-forming area I includes a via-hole that extends through the functional film layer and the base film layer; the bridge area II includes signal traces for signal transmission; and the island area III includes display components, which are electrically connected with the signal traces for light-emitting display. The hole-forming area I may be arranged in an “H”-shaped structure in the partial display region.

It should be noted that the hole-forming area I, the bridge area II and the island area III are repetitively arranged.FIG.2ashows only one structural unit for repetitive arrangement; as shown inFIG.2b, a plurality of structural units as shown inFIG.2amay be repeatedly arranged in the partial display region.

The plurality of hole-forming areas I are openly arranged around the island area III. As shown inFIG.2a, the island area III includes four directions, and four hole-forming areas I occupy parts in the four directions respectively, so that signal traces in the bridge area II can be electrically connected to the display components in the island area III. Optionally, the separation structure210is located in the bridge area II at a position near the hole-forming area I.

The separation structure210is located in the bridge area II. Specifically, the separation structure210is located in the bridge area II between two hole-forming areas I, and is also located in the bridge area II between the hole-forming area I and the island area III. The separation structure210is shown by the dashed line inFIG.2.

An outline of an orthographic projection of each separation structure210onto the base film layer is a closed pattern and is the same as a boundary pattern of the hole-forming area I, thereby ensuring that the separation structure210prevents water and oxygen from intruding the island area III from the hole-forming area I at each position.

The separation structure210is located on the base film layer for separating a target functional film layer to form a first part and a second part, and the target function film layer is any functional film layer formed at a side of the separation structure away from the base film layer, and the target functional film layer is a display film layer.

By dividing the target functional film into a first part and a second part that are separated from each other, when the second part near the hole-forming area I is intruded by water and oxygen, the first part located in the island area III will be not intruded by water and oxygen because the first part is separated from the second part, thereby ensuring the normal operation of the target functional film in the island area III and then ensuring the normal display of the display device.

Each separation structure210is a closed structure with a head thereof being connected to an end thereof. The separation structure210is arranged around the hole-forming area I.

In this embodiment, each separation structure210is a closed structure. By arranging the separation structure210around the hole-forming area I, it is possible to prevent the water and oxygen intruded from the hole-forming area I from passing through the separation structure210into the island area III, thereby ensuring the water and oxygen blocking effect of the island area III.

Each hole-forming area I is surrounded by at least one separation structure210to prevent water and oxygen in the hole-forming area I from intruding the island area III. The greater the number of separation structures210that surround the hole-forming area I, the better the effect of preventing water and oxygen from intruding the island area III, but at the same time the larger the space of the bridge area II occupied by the separation structures210. By designing the number of separation structures210surrounding one hole-forming area I to be 1, 2 or 3, the space occupied by the separation structures210in the bridge area II can be reduced while ensuring the water and oxygen blocking effect of the island area III.

At least two separation structures210surrounding an identical hole-forming area I have a same direction, i.e., having an identical contour shape, and a contour length is proportional to a distance from each separation structure210to the hole-forming area I. The at least two separation structures210surrounding the identical hole-forming area I are arranged being concentric with a center of the hole-forming area I.

In an optional implementation of the present disclosure, the step of forming the separation structure on the flexible base film layer includes:

forming first-layer signal traces and a planarization layer covering the first-layer signal traces on the flexible base film layer;

simultaneously forming a first metal pattern and a second metal pattern in the bridge area on the first planarization layer, where the second metal pattern is located between the first metal pattern and the hole-forming area, each metal pattern includes a first metal layer and a second metal layer arranged in a direction perpendicular to the flexible base film layer, and the first metal layer is located between the second metal layer and the flexible base film layer;

forming an anode material layer on the flexible base film layer;

etching the second metal pattern to form an separation column while etching the anode material layer to obtain an anode, where an etching speed of the first metal layer is greater than an etching speed of the second metal layer.

In this embodiment, the separation structure is a separation column, and structure and material of the separation column are the same as structure and material of the second-layer signal traces.

The second metal pattern is a metal pattern for preparing the separation column, and the first metal pattern is a metal pattern for preparing the second-layer signal traces. After the first planarization layer is fabricated, the first metal pattern and the second metal pattern can be simultaneously formed on the first planarization layer through a patterning process.

Each of the first metal pattern and the second metal pattern includes a first metal layer and a second metal layer arranged in a direction perpendicular to the flexible base film layer, and the first metal layer is located between the second metal layer and the flexible base film layer. Under a same etching condition, a metal material with a high etching speed is selected as the first metal layer, and a metal material with a low etching speed is selected as the second metal layer. For example, metal aluminum is used as the first metal layer, and metal titanium is used as the second metal layer.

After the first metal pattern and the second metal pattern are formed, an anode material layer is formed, and the second metal layer is etched to obtain the separation column in the process of obtaining the anode material layer by etching. As shown inFIG.5, the first structure510of the separation column451is a portion of the first metal layer after etching, and the second structure520is s portion of the second metal layer after etching.

It should be noted that after the first metal pattern and the second metal pattern are formed and before the anode material is formed, there may also be a step of forming other functional film layers. These formed functional film layers are not retained in the bridge area after patterning, and thus, the anode material formed subsequently can cover the first metal pattern and the second metal pattern, for example, a second planarization layer is formed in the island area.

A target functional film layer subsequently formed at a side of the separation column away from the substrate film layer410will be divided, at the second structure520, into a first part610and a second part620separated with each other, as shown inFIG.6. The first part610includes a part of the target functional film layer located at a side of the separation structure away from the hole-forming area I, and the second part620includes a part of the target functional film layer located at a side of the separation structure close to the hole-forming area I. In this way, when water and oxygen intrude the second part620of the target functional film layer, the water and oxygen will not intrude into the first part610through the second part620, so that functionality of the first part610of the target functional film layer will not be damaged, thereby ensuring normal display of the island area.

The step of etching the second metal pattern to form an separation column while etching the anode material layer to obtain an anode, includes:

while etching the anode material layer in the island area with a first etching solution to obtain an anode, etching a part of the anode material layer covering the second metal pattern and reserving a part of the anode material layer covering the first metal pattern;

etching the second metal pattern with a second etching solution to form a separation structure.

In this embodiment, first, an entire layer of the anode material layer is coated with photoresist, and the photoresist is covered by a mask with a light-transmitting area corresponding to the anode and the first metal pattern, and a photoresist pattern is obtained after exposure. An orthographic projection of the photoresist onto the base film layer coincides with an orthographic projection of the anode onto the base film layer and an orthographic projection of the first metal pattern onto the base film layer.

Then, the first etching solution is used for development, while etching a part of the anode material in the island area to obtain the anode, the part of the anode material in the bridge area covering the second metal pattern is etched to expose the second metal pattern, but the part of the anode material covering the first metal pattern is not etched, so that the anode material protects the first metal pattern, as shown inFIG.9.

After that, the second etching solution is used to etch the exposed second metal pattern. The second etching solution cannot etch the anode material, so the first metal pattern protected by the anode material will not be etched by the second etching solution, so that the second metal pattern forms a separation column, as shown inFIG.10. Afterwards, the anode material covering the first metal pattern is removed.

In this way, it can be ensured that when the second metal pattern is etched to form the separation column, the first metal pattern is prevented from being etched, and the production yield of the second-layer signal traces can be ensured.

In another optionally embodiment of the present disclosure, the step of forming the separation structure on the flexible base film layer, includes:

sequentially forming first-layer signal traces, a first planarization layer covering the first-layer signal traces, the second-layer signal trace, a second planarization layer covering the second-layer signal traces and a passivation layer on the flexible base film layer;

etching the passivation layer to form a via-hole that extends through the passivation layer in the bridge area;

taking the etched passivation layer as a mask, etching a part of the second planarization layer to form a groove in the second planarization layer in the bridge area, so that the via-hole and the groove together form a separation groove, where an orthographic projection of an opening of the separation groove onto the flexible base film layer is located inside an orthographic projection of the separation groove onto the flexible base film layer.

In this embodiment, the separation structure is a separation groove that extends through the passivation layer and a part of the second planarization layer.

First, after the passivation layer is formed, a photoresist is coated on the passivation layer and then is exposed, and then a via-hole that extends through the passivation layer, is formed by development.

After that, taking the passivation layer with the via-hole as a mask, a part of the second planarization layer is dry etched to form a groove in the second planarization layer, as shown inFIG.11. A size of an opening in the groove can be adjusted by controlling the time of dry etching.

After the separation groove is formed and the fabrication of the via-hole is completed, the passivation layer is patterned, as shown inFIG.12.

In this embodiment, the opening of the separation groove is an opening in a side of the passivation layer away from the substrate film layer, that is, an end of the via-hole defined in the passivation layer away from the base film layer.

The target functional film layer subsequently formed at the side of the separation groove452away from the base film layer410will be divided into a first part610and a second part620that are separated with each other at the opening, as shown inFIG.8. The first part610includes a part of the target functional film layer that is located at a side of the separation groove452away from the hole-forming area I, and the second part620includes a part of the target functional film layer that is located at a side of the separation structure near the hole-forming area I. In this way, when water and oxygen intrude the second part620of the target functional film layer, the water and oxygen will not intrude into the first part610through the second part620, so that the functionality of the first part610of the target functional film layer will not be damaged, thereby ensuring normal display of the island area III.

Unless otherwise defined, the technical or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The terms “first”, “second”, and the like used in this disclosure do not indicate any order, quantity, or priority, but are only used to distinguish different components. The terms “include”, “have” or any variations thereof are intended to mean that an element or article followed by such a term encompasses a list of elements or articles preceded by such a term, or equivalents thereof, without precluding other elements or articles. Expressions such as “connection” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Such words as “on”, “under”, “left” and “right” are merely used to represent relative position relationship, and when an absolute position of the object is changed, the relative position relationship will be changed too.

It will be understood that when an element, such as a layer, film, area or substrate, is referred to as being “on” or “under” another element, it can be directly on or directly under the other element, or intervening elements may also be present.

The embodiments of the present disclosure have been described above with reference to the drawings, but the present disclosure is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Under the teaching of the present disclosure, a person skilled in the art may make various modifications without departing from the principle of the present disclosure and the protection scope of the claims, which shall also fall within the scope of the present disclosure.