KR-102961096-B1 - Flexible display panel and method of manufacturing the same, and flexible display device

KR102961096B1KR 102961096 B1KR102961096 B1KR 102961096B1KR-102961096-B1

Abstract

A flexible display panel, a method for manufacturing the same, and a flexible display device are disclosed. The flexible display panel comprises a flexible substrate, the flexible substrate comprises a display area, a peripheral area, a bonding pad area, and a bending area, the bending area comprises a first edge; the flexible display panel further comprises a barrier and an organic insulating layer, the peripheral area comprises a peripheral transition area located between the bending area and the display area; a first groove is provided within the organic insulating layer within the peripheral transition area; the first groove is located on the side of the barrier away from the display area and extends substantially in a direction parallel to the bending axis; and the first groove is located on the side of the first edge near the display area. The first groove is provided within the organic insulating layer within the peripheral transition area, thereby making it easier to relieve bending stress and thus preventing the bending area from breaking.

Inventors

퉁, 커멍
둥, 샹단
허, 판

Assignees

보에 테크놀로지 그룹 컴퍼니 리미티드
청두 비오이 옵토일렉트로닉스 테크놀로지 컴퍼니 리미티드

Dates

Publication Date: 20260507
Application Date: 20191220

Claims (20)

As a flexible display panel, Flexible substrate - The flexible substrate is, Display area; A peripheral area surrounding the periphery of the above-mentioned display area; A welding area on one side of the surrounding area far from the display area; and A curved region between the above-mentioned surrounding region and the above-mentioned welding region, comprising a curved region configured to be curved along a curve axis and including a first edge -; A barrier on the flexible substrate—the barrier is located within the peripheral region and surrounds the periphery of the display region—; and It includes an organic insulating layer on the flexible substrate above, The above peripheral region includes a peripheral transition region between the bending region and the display region, and a first groove is provided in the organic insulating layer within the peripheral transition region, the first groove is on one side of the barrier far from the display region and extends along a direction substantially parallel to the bending axis, and the first groove is on one side of the first edge close to the display region, and A flexible display panel in which the above peripheral transition region includes a first fan-out region, and the orthogonal projection of the first groove on the flexible substrate partially overlaps with the first fan-out region.
In paragraph 1, the flexible substrate is, It further includes a second fan-out region between the above-mentioned bending region and the above-mentioned welding region, wherein the second fan-out region is adjacent to the above-mentioned bending region, and A flexible display panel, wherein a second groove is provided in the organic insulating layer between the bending region and the welding region, and the orthogonal projection of the second groove on the flexible substrate partially overlaps with the second fan-out region.
A flexible display panel according to claim 2, wherein the bending region further includes a second edge, the second edge is positioned opposite to the first edge, the extension direction of the second edge and the first edge are the same, and the second groove is on one side of the second edge near the welding region and extends along a direction substantially parallel to the bending axis.
A flexible display panel according to paragraph 3, wherein the organic insulating layer within the bending region is provided with a third groove and a fourth groove, and the third groove and the fourth groove extend along a direction perpendicular to the bending axis.
A flexible display panel according to claim 4, wherein each of the third groove and the fourth groove includes a first end and a second end, and the third groove and the fourth groove extend across the curved region, and the first end of the third groove and the first end of the fourth groove are each connected to two opposing ends of the first groove, and the second end of the third groove and the second end of the fourth groove are each connected to two opposing ends of the second groove.
In paragraph 5, The signal line on the flexible substrate further comprises, said signal line is drawn from the display area and extends at least partially to the welding area through the first fan-out area and the bending area along a direction perpendicular to the bending axis, and An overlapping region is not formed between the orthogonal projection of each of the first groove, the second groove, the third groove, and the fourth groove on the flexible substrate and the orthogonal projection of the signal line on the flexible substrate, and A flexible display panel, wherein each of the first groove and the second groove is separated at an intersection with the signal line, the first groove has a first gap at the intersection, the second groove has a second gap at the intersection, and the signal line extends to pass through the first gap and the second gap.
A flexible display panel according to claim 6, wherein the signal line comprises a plurality of signal lines, and each of the third groove and the fourth groove is located between one of the plurality of signal lines furthest from the second fan-out area and the edge of the flexible substrate.
In paragraph 6, It further includes a touch electrode located within the display area and configured to detect the occurrence of a touch within the display area, and The above signal line is, It includes a touch signal line configured to be electrically connected to the touch electrode within the display area, and A flexible display panel, wherein the touch signal line comprises a first touch portion within the curved region and a second touch portion outside the curved region, and the first touch portion of the touch signal line and the second touch portion of the touch signal line are located within different film layers.
In claim 8, the display area includes a plurality of pixel areas, and an organic light-emitting element is provided in each of the plurality of pixel areas, and the signal line is, It further includes a common signal line configured to be electrically connected to the above organic light-emitting element, and The above common signal line includes a first common portion within the curved region and a second common portion outside the curved region, and the first common portion of the common signal line and the second common portion of the common signal line are within different film layers; A flexible display panel in which an overlapping area is not formed between the orthogonal projection of the first common part of the common signal line on the flexible substrate and the orthogonal projection of the first touch part of the touch signal line on the flexible substrate, and an overlapping area is formed between the orthogonal projection of the second common part of the common signal line on the flexible substrate and the orthogonal projection of the second touch part of the touch signal line on the flexible substrate.
In claim 9, a pixel circuit is additionally provided in each of the plurality of pixel regions, and the signal line is, It further includes a driving signal line on one side of the common signal line far from the second fan-out region, and the driving signal line is configured to be electrically connected to the pixel circuit. A flexible display panel, wherein the driving signal line comprises a first driving unit within the bending region and a second driving unit outside the bending region, and the first driving unit of the driving signal line and the second driving unit of the driving signal line are located on different film layers.
In paragraph 1, A first gate electrode layer on the flexible substrate above; A first gate insulating layer on one side of the first gate electrode layer far from the flexible substrate; and It includes a second gate electrode layer on one side of the first gate insulating layer far from the flexible substrate, and A flexible display panel, wherein the first groove is located on one side of the second gate electrode layer far from the flexible substrate.
In Clause 11, the organic insulating layer is, A first planarization layer on one side of the second gate electrode layer far from the flexible substrate; and It includes a second planarization layer on one side of the first planarization layer far from the flexible substrate, and A flexible display panel, wherein the first groove penetrates the first flattening layer and the second flattening layer, the first groove includes a side wall, and the side wall is a side wall of the second flattening layer surrounding the first flattening layer.
A flexible display panel according to claim 12, wherein the first groove is formed through a patterning process performed on the second planarization layer using a dual-tone mask, and the indentation angle between the tangent of the sidewall and the flexible substrate is 20 to 40 degrees.
A flexible display panel according to claim 12, wherein the side wall has an arc-shaped inclined surface, the arc-shaped inclined surface is connected to the upper surface of the second flattening layer at the peripheral edge of the first groove, and the arc-shaped inclined surface is tangent to the upper surface at the connection location.
A flexible display panel according to claim 12, wherein the side wall comprises a plurality of side portions in a plane perpendicular to the extension direction of the first groove, each of the plurality of side portions has an arc-shaped inclined surface, and the plurality of arc-shaped inclined surfaces are connected to each other to form the side wall.
In Paragraph 12, A second gate insulating layer on the second gate electrode layer; A first source-drain electrical conductive layer between the second gate insulating layer and the first planarization layer; A second source-drain electrical conductive layer between the first planarization layer and the second planarization layer; A first touch electrically conductive layer on one side of the second planarization layer far from the flexible substrate; A second touch electrical conductive layer on one side of the first touch electrical conductive layer far from the flexible substrate; and It includes a touch insulating layer between the first touch electrical conductive layer and the second touch electrical conductive layer, The flexible display panel further comprises a touch signal line, wherein a first portion of the touch signal line comprises the second source-drain electrically conductive layer, and a second portion of the touch signal line comprises the first touch electrically conductive layer and the second touch electrically conductive layer.
A flexible display panel according to claim 16, wherein the second touch electrically conductive layer in the second portion of the touch signal line is connected to the second source-drain electrically conductive layer in the first portion of the touch signal line by overlapping through an opening in the second flattening layer.
In claim 17, the flexible display panel further comprises a common signal line including a first common portion and a second common portion, wherein the first common portion of the common signal line comprises the second source-drain electrical conductive layer and the second common portion of the common signal line comprises the first source-drain electrical conductive layer.
In claim 18, the flexible display panel further comprises a driving signal line including a first driving unit and a second driving unit, wherein the first driving unit of the driving signal line comprises the second source-drain electrically conductive layer and the second driving unit of the driving signal line comprises the first source-drain electrically conductive layer.
In Paragraph 16, An encapsulation layer between the second planarization layer and the first touch electrical conductive layer; and It further comprises a pixel forming layer configured to form a plurality of pixel regions—the pixel forming layer being located between the second flattening layer and the encapsulation layer—and The above barrier is, A first barrier located within the above-mentioned surrounding area and surrounding the display area—the first barrier comprises a first barrier portion within the surrounding transition area and a second barrier portion within other areas of the surrounding area excluding the surrounding transition area—; and A second barrier located within the above-mentioned surrounding area and surrounding the display area—the second barrier is located on one side of the first barrier far from the display area, and the second barrier includes a third barrier portion within the surrounding transition area and a fourth barrier portion within other areas of the surrounding area excluding the surrounding transition area—and A flexible display panel, wherein the first barrier portion comprises the second flattening layer and the pixel forming layer, and the third barrier portion comprises the first flattening layer, the second flattening layer surrounding the first flattening layer, and the pixel forming layer surrounding the second flattening layer.

Description

Flexible display panel and method of manufacturing the same, and flexible display device The embodiments of the present disclosure relate to a flexible display panel, a method for manufacturing the same, and a flexible display device. With the advancement of AMOLED (Active Matrix Organic Light-Emitting Diode) display technology, the frames of flexible AMOLED products are gradually narrowing, the screen-to-body ratio is gradually increasing, and the product thickness is gradually decreasing. To meet user demands regarding product thickness and touch experience, methods to reduce product thickness and implement a better touch experience are becoming the focus of research in the industry. To clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below, and it is evident that the drawings described relate only to some embodiments of the present disclosure and thus do not limit the present disclosure. FIG. 1 is a schematic plan view of a flexible display panel according to an embodiment of the present disclosure. FIG. 2 is an equivalent circuit diagram of a pixel circuit of a flexible display panel according to an embodiment of the present disclosure. Figure 3 is another planar schematic diagram of the flexible display panel of Figure 1. FIG. 4 is a schematic diagram of a partial structure of a flexible display panel in a bent state according to an embodiment of the present disclosure. FIG. 5 is a schematic plan view of a plurality of grooves in a flexible display panel according to an embodiment of the present disclosure. FIG. 6 is a schematic plan view of a first groove and a second groove in a flexible display panel according to an embodiment of the present disclosure. Figure 7 is a schematic cross-sectional view along line II of Figure 3. FIG. 8 is an enlarged planar schematic diagram of the area (Q1) of the flexible display panel of FIG. 3. Figure 9 is a schematic cross-sectional view along line AA of Figure 8. Figure 10 is a schematic cross-sectional view along line BB of Figure 8. FIG. 11 is a schematic cross-sectional view of a first touch electrical conductive layer and a second touch electrical conductive layer according to an embodiment of the present disclosure. FIG. 12 is a schematic plan view of a common signal line according to an embodiment of the present disclosure. Figure 13 is a cross-sectional view along line CC of Figure 12. FIG. 14 is an enlarged planar schematic diagram of the area (Q2) of the flexible display panel of FIG. 3. FIG. 15 is an enlarged planar schematic of area E of FIG. 10. FIG. 16 is a schematic diagram of another variation of the side wall of the first groove according to one embodiment of the present disclosure. FIG. 17 is a schematic diagram of another variation of the side wall of the first groove according to one embodiment of the present disclosure. FIG. 18 is a schematic cross-sectional view along line II-II of FIG. 3. FIGS. 19a to 19d are schematic diagrams of each step of forming a first groove according to one embodiment of the present disclosure. To clarify the purposes, technical details, and advantages of the embodiments of the present disclosure, the technical solutions of the embodiments will be described in a clear and fully understandable manner in connection with the drawings relating to the embodiments of the present disclosure. By way, the described embodiments are only a part, not all, of the embodiments of the present disclosure. Based on the embodiments described herein, a person skilled in the art can obtain other embodiment(s) within the scope of the present disclosure without any creative work. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a person skilled in the art to which this disclosure pertains. Terms such as “first,” “second,” etc., used in the description and claims of this disclosure are intended to distinguish various components, not to indicate any sequence, quantity, or importance. Terms such as “comprises,” “includes,” “comprising,” “including,” etc., are intended to indicate that the element or object described before these terms includes the element or object and its equivalents listed after these terms, but does not exclude other elements or objects. Phrases such as “connected,” “connected,” etc., are not intended to define a physical or mechanical connection and may include an electrical connection directly or indirectly. Terms such as “on,” “under,” “right,” “left,” etc., are used solely to indicate relative positional relationships, and when the position of the object being described changes, the relative positional relationship may change accordingly. In the following description, where it is stated that an element or layer is "on" or "connected" to another element or layer, the element or layer may be directly on or directly connected to the other element or layer,