CN109087586B - Display device and flexible display panel thereof - Google Patents
Display device and flexible display panel thereof Download PDFInfo
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- CN109087586B CN109087586B CN201810791107.0A CN201810791107A CN109087586B CN 109087586 B CN109087586 B CN 109087586B CN 201810791107 A CN201810791107 A CN 201810791107A CN 109087586 B CN109087586 B CN 109087586B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Abstract
The invention relates to a display device and a flexible display panel thereof. The flexible display panel comprises a screen body and a buffer layer attached to the lower surface of the screen body, wherein the screen body comprises a display area and a non-display area extending outwards from the display area, and the non-display area comprises a bending area and a non-bending area. The buffer layer extends out of the display area and covers the bending area, and the thickness of the buffer layer close to the connection position of the bending area and the non-bending area is larger than that of the buffer layer far away from the connection position. Through extending the buffer layer display area and covering the bending area to buffer the bending area and protect and thicken the whole thickness of bending area, avoided the bending area to appear the dead book. Meanwhile, the buffer layer at the joint of the bending area with the stress concentration and the non-bending area is thicker, so that the stress concentration of the position is reduced, the crease mark at the position is avoided, and the screen body of the bending area and the circuit are prevented from being damaged and losing efficacy.
Description
Technical Field
The invention relates to the field of flexible display, in particular to a display device and a flexible display panel thereof.
Background
With the development of flexible display technology, flexible display screens have become the development trend of future display terminals. In order to achieve the full screen display effect of the flexible display screen, the flexible display screen is generally adopted
The method for bending the non-display area is realized by the following steps: the non-display area of the flexible display screen is bent to the back of the flexible display screen, so that the width of a frame of the screen body is reduced, and the screen occupation ratio is improved.
However, bending of the flexible display screen easily causes stress concentration at the initial and final positions of the screen body bending, and creases are generated, thereby causing damage and failure of the screen body or the cable at the positions.
Disclosure of Invention
Therefore, it is necessary to provide a display device and a flexible display panel thereof for preventing the flexible display screen from being damaged and failed after being bent.
A flexible display panel comprising:
the screen body comprises a display area and a non-display area extending from the display area; the non-display area comprises a bending area and a non-bending area;
a buffer layer; the buffer layer is attached to the lower surface of the screen body, covers the display area and extends out of the display area to cover the bending area; the thickness of the buffer layer close to the joint of the bending area and the non-bending area is a first thickness; the thickness of the buffer layer far away from the connection part is a second thickness; the first thickness is greater than the second thickness.
The flexible display panel comprises a screen body and a buffer layer attached to the lower surface of the screen body, wherein the screen body comprises a display area and a non-display area extending outwards from the display area, and the non-display area comprises a bendable bending area and a non-bending area connected with the bending area. The buffer layer extends out of the display area and covers the bending area, and the thickness of the buffer layer close to the connection part of the bending area and the non-bending area is larger than that of the buffer layer far away from the connection part. Due to the thin and soft characteristics of the flexible display panel, when the non-display area is bent to the back of the screen body, the bent area, particularly the joint of the bent area and the non-bent area, is prone to stress concentration, and creases are generated to cause damage and failure of the screen body or circuit wiring of the bent area. Through extending the buffer layer bending zone to the thickness of the bending zone of thickening and the non-bending zone junction, thereby reduce bending zone bending stress concentration phenomenon, avoid bending the district and appear the dead book, and then reduce the screen body and the circuit line of bending zone and be creased the inefficacy risk.
In one embodiment, the end face of the buffer layer close to the bending region forms an uneven curved surface.
In one embodiment, the buffer layer in the middle of the bending region has a hollow structure.
In one embodiment, the pattern of the hollow structure is a plurality of grooves arranged along the width direction of the screen body.
In one embodiment, the side walls of the recess form a rugged curve.
In one embodiment, the non-display area comprises a first non-display area extending outwards along the length direction of the screen body; the first non-display area comprises a first bending area which can bend towards the lower part of the screen body; the buffer layer extends out of the display area and covers the first bending area.
In one embodiment, the non-display area further includes a second non-display area and a third non-display area extending to two sides of the screen body along the width direction of the screen body, and the second non-display area includes a second bending area capable of bending towards the lower part of the screen body; the third non-display area comprises a third bending area which can bend and bend towards the lower part of the screen body; the buffer layer extends out of the display area and covers the second bending area and the third bending area.
In one embodiment, the screen body comprises a flexible substrate, and the buffer layer is a buffer material attached to the flexible substrate.
In one embodiment, the cushioning layer is foam.
A display device comprises the flexible display panel, a frame and a protective cover plate, wherein the flexible frame is sleeved on the periphery of the display panel; the protective cover plate is attached to the display surface.
According to the display device, due to the fact that the flexible display panel is installed, the screen body of the flexible display panel is soft and thin, when the bending area is bent, dead bending caused by the fact that the bending radius is too small is easy to occur, particularly, stress concentration and crease marks are easy to occur at the position of the initial bending line and the position of the final bending line, and then the circuit of the bending area is damaged. Through extending the buffer layer display area and covering the bending area, from buffering the bending area and protecting and thickening the whole thickness of bending area, avoided the bending area to appear the dead book. Meanwhile, the buffer layer at the joint of the bending area and the non-bending area is thick, so that the stress concentration of the position is reduced, the crease at the position is avoided, the screen body of the bending area and the circuit are prevented from being damaged and losing efficacy, and the service life of the display device is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display panel according to an embodiment;
fig. 2 is a schematic structural diagram of a screen body of the flexible display panel shown in fig. 1;
fig. 3 is a schematic bending view of the flexible display panel shown in fig. 1;
fig. 4 is a schematic structural diagram of a flexible display panel according to another embodiment;
fig. 5 is a schematic structural diagram of a screen body of the flexible display panel shown in fig. 4.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, a flexible display panel 100 of an embodiment includes a panel body 110 and a buffer layer 120 attached to a lower surface of the panel body 110, wherein the panel body 110 includes a display region 111 and a non-display region 112 extending from the display region 111. Specifically, the display area 111 is a display image area of the screen body 110, and the non-display area 112 is a non-display image area of the screen body 110. Further, components for displaying images, such as light emitting elements and pixel arrays, are distributed on the display region 111, and integrated circuits for realizing functions of signal transmission and driving the light emitting elements to emit light are distributed on the non-display region. It should be noted that, for convenience of description, fig. 1 and fig. 2 show that the non-display area 112 extends outward from one side of the display area 111, but the invention is not limited thereto, and the non-display area 112 may also extend outward from multiple sides of the display area 111.
Further, referring to fig. 1, 2, and 3, the display area 111 includes a display surface 114 for displaying an image and a back surface 115 disposed opposite to the display surface 114. The display surface 114 is an upper surface of the screen body 110, and the back surface 115 is a lower surface of the screen body 110. In order to realize the full-screen display of the flexible display panel 100, the non-display area 112 where no image is displayed may be bent 180 ° toward the lower side of the screen body 110, and the non-display area 112 may be bent to the back 115 of the display area 111, so as to hide the non-display area 112, and increase the area ratio of the display area 111 on the front surface of the screen body 110, thereby increasing the screen ratio of the flexible display panel 100. In order to realize the bending of the non-display area 112, at least a portion of the non-display area 112 is a bending area 112a capable of bending toward the lower side of the screen body 110, and an area of the non-display area 112 other than the bending area 112a is a non-bending area 112 b. Further, the bending region 112a has a connection portion 112c connected to the non-bending region 112 b. Specifically, there are two connecting portions 112c, and the region defined between the two connecting portions 112c is the bending region 112 b.
The buffer layer 120 is attached to a lower surface of the screen body 110 and covers the display region 111 to buffer and protect the display region 111. Further, the buffer layer 120 extends out of the display region and covers the bending region 112 a. Furthermore, the buffer layer 120 near the junction 112c of the bending region 112a and the non-bending region 112b has a first thickness a, and the buffer layer far from the junction 112c, i.e., the middle portion 1133 of the bending region 112a has a second thickness b, where the first thickness a is greater than the second thickness b.
The flexible display panel 100 includes a panel 110 and a buffer layer 120 attached to a lower surface of the panel 110, wherein the panel 110 includes a display region 111 and a non-display region 112 extending outward from the display region 111, and the non-display region 112 includes a bendable bending region 112a and a non-bending region 112b connected to the bending region 112 a. The buffer layer 120 extends out of the display region 111 and covers the bending region 112a, and the thickness of the buffer layer 120 near the junction 112c of the bending region 112a and the non-bending region 112b is greater than the thickness of the buffer layer 120 far from the junction 112 c. Since the screen body 110 of the flexible display panel 100 is flexible and thin, when the bending region 112a is bent, a dead-fold phenomenon due to an excessively small bending radius is likely to occur, and particularly, a connection 112c between the bending region 112a and the non-bending region 112b is more likely to have stress concentration, crease generation, and the like, thereby causing a circuit of the bending region 112a to be damaged. By extending the buffer layer 120 out of the bending region 112a and attaching the buffer layer to the bending region 112a, the buffer protection is performed on the bending region 112a and the overall thickness of the bending region 112a is increased, so that the dead fold phenomenon caused by too small bending radius or local bending of the bending region 112a is avoided. Meanwhile, at the joint 112c of the bending region 112a and the non-bending region 112b where the stress is concentrated, the thickness of the buffer layer 120 is thicker, so that the stress concentration at the position is reduced, a crease mark at the position is avoided, and further, damage and failure of the screen body of the bending region 112a and a circuit are prevented.
Specifically, referring to fig. 1 and 2, in one embodiment, the end surface 121 of the buffer layer 120 near the bending region 112a forms an uneven curved surface. Further, the rugged curve can be a continuous arch structure, can also be formed by a plurality of bulges and depressions which are alternately formed in sequence, and can also be an irregular wavy undulating structure. The end face 121 of the buffer layer 120 is configured to be a concave-convex curved surface structure, and the curved surface structure prevents the stress point of the bending region 112a from being located on the same straight line to generate a crease, so that the bending stress of the bending region 112a is dispersed by multiple angles, and stress concentration is further dispersed.
Referring to fig. 1, fig. 2, and fig. 3, in an embodiment, the buffer layer 120 has a hollow structure, and specifically, the buffer layer 120 attached to the middle portion 1133 of the bending region 112a has a hollow structure. Further, the hollow structure may be a plurality of grooves 122 arranged along the width direction of the screen body 110. Further, the sidewalls 1221 of the grooves 122 may also be arranged in a rugged curved structure to distribute stress concentration. It should be noted that the hollow structure may be various, and the hollow structure shown in fig. 1 is only an exemplary illustration, but not limited thereto, and in other embodiments, the pattern of the hollow structure may also be a plurality of diamond-shaped through holes or circular through holes arranged along the width direction of the screen body 110. The buffer layer 120 in the middle of the bending region 112a is hollowed out, so that the bending region 112a can be bent conveniently, and meanwhile, the dense circuit flat cable region of the bending region 112a can be arranged in the hollowed-out structure, and the buffer layer 120 is prevented from extruding or dragging the circuit flat cable to be damaged.
Generally, the panel body 110 includes a flexible substrate, which may be divided into a display region and a non-display region extending from the display region, and a display layer may be integrated on the display region of the flexible substrate. The display layer may include a plurality of display parts for displaying images such that the display region of the flexible substrate forms the display region 113 of the panel body 110, and may include various display parts such as thin film transistors, gate lines, data lines, capacitors, anodes, cathodes, organic light emitting layers, color filters, and the like thereon. A polarizer may also be disposed over the display layer to increase the transmission of light through the display layer and to reduce external light reflection. A touch sensitive layer can be further arranged on the polarizer and is integrated with a touch sensor to sense touch operation of a user. A flexible cover sheet for protecting the screen body 110 is also disposed on the touch sensitive layer. The back surface of the display region of the flexible substrate may be provided with a support film having a higher rigidity than the flexible substrate, thereby rigidly supporting the flexible substrate. A buffer material such as foam may be disposed under the support film to buffer and protect the screen body 110. An integrated circuit for implementing functions of signal transmission, driving image display, and the like is disposed on the non-display region of the flexible substrate, thereby forming the non-display region 113 of the panel body 110. When the panel 110 is bent, only the non-display region of the flexible substrate is bent, and the functional layers disposed on the display region of the flexible substrate do not need to be bent. Further, in the present embodiment, the panel 110 adopts a COP (Chip On Pi film) packaging technology.
Further, the buffer layer 120 may be formed by directly extending a buffer material such as foam attached to the back surface of the flexible substrate toward the non-display region of the flexible substrate. But not limited thereto, in other embodiments, the buffer layer may be formed by extending other functional layers attached to the back surface of the flexible substrate, such as the buffer layer is formed by a support film attached to the back surface of the flexible substrate. The buffer layer 120 is formed by directly extending the functional layer on the back of the flexible substrate, which can save materials and reduce cost.
As described above, the non-display region may also extend outward from a plurality of sides of the display region, and specifically, referring to fig. 4 and 5, the flexible display panel 200 of another embodiment includes a panel 210 and a buffer layer 220 attached on the panel 210, wherein the panel 210 includes the display region 211 and the non-display region extending from the display region 211.
Specifically, the non-display area includes a first non-display area 2121 extending outward from the display area 211 in a length direction of the screen body 110. The first non-display area 2121 includes a first bending area 2131 that may be bent toward the lower side of the screen body 210. The non-display region further includes a second non-display region 2122 and a third non-display region 2123 extending to left and right sides of the screen body 210 in a width direction of the screen body 210. The second non-display area 2122 includes a second bending area 2132 that can be bent toward the lower side of the screen body 210. The third non-display area 2123 includes a third bending area 2133 that may be bent toward the lower side of the screen body 210.
Specifically, the buffer layer 220 is attached to the lower surface of the panel 210 and covers the display region 211, and each side of the buffer layer 220 extends out of the display region and covers the first bending region 2131, the second bending region 2132, and the third bending region 2133. And the thickness of buffer layer 220 near the junction of each inflection region and each non-inflection region is greater than the thickness of buffer layer 220 away from the junction.
The flexible display panel 200 extends the buffer layer 220 out of the back of the screen body 210, and the extended buffer layer 220 covers the first bending area 2131, the second bending area 2132 and the third bending area 2133, so that each bending area is buffered and protected, the overall thickness of each bending area is increased, and the dead fold phenomenon of each bending area is avoided. Meanwhile, the buffer layer 220 at the joint of each bending region and each non-bending region has a relatively thick thickness, so that stress concentration at the position is reduced, creases are prevented from occurring at the position, and further, damage and failure of the screen body 210 and the circuit of each bending region are prevented.
With continued reference to fig. 4 and 5, in one embodiment, the end surface 221 of the buffer layer 220 extending out of each bending region forms an uneven curved surface. Further, the rugged curved surface may be a continuous arch structure, or a plurality of protrusions and depressions alternately formed in sequence, or an irregular wavy undulating structure. The edge 221 of the buffer layer 220 is configured to be a concave-convex curved structure, and the curved structure prevents the stress points of the bending regions from being located on the same straight line to cause the screen body 210 to generate creases, so that the bending stress of the bending regions is dispersed at multiple angles.
In one embodiment, the buffer layer 220 in the middle of each bending region is a hollow structure. Further, the hollow structure may be a plurality of grooves 222 arranged along the width direction of the screen body 210. Further, the sidewalls 2221 of the groove 222 may also be arranged in an uneven curved structure to disperse the stress concentration. It should be noted that the patterns of the hollow structures may be various, and the hollow structure pattern shown in fig. 1 is only an exemplary illustration, but not limited thereto, and in other embodiments, the patterns of the hollow structures may also be a plurality of diamond-shaped through holes or circular through holes arranged along the width direction of the screen body 210. The buffer layer 220 at the middle of each bending region is hollowed out to facilitate bending of each bending region. Meanwhile, the dense circuit flat cable regions of the bending regions can be arranged in the hollow structure, so that the circuit flat cables are prevented from being extruded or pulled to be damaged by the buffer layer 120.
It should be noted that other components and structures of the flexible display panel 200 may be arranged the same as those of the previous embodiment, and are not described again.
In an embodiment of the present application, there is also provided a display device including the flexible display panel of any one of the foregoing embodiments. Further, the display device may further include a frame for supporting the flexible display panel and a protective cover plate for protecting the flexible display screen, the frame being sleeved around the flexible display panel, and further, the frame may be flexible, but the rigidity of the frame is higher than that of the flexible display panel. The protective cover is attached to the display surface of the flexible display panel. Further, the display device may be a mobile phone, a tablet computer, or the like.
In the display device, because the flexible display panel 100 or the flexible display panel 200 is installed, since the screen body of the flexible display panel is soft and thin, when the bending area is bent, a dead-fold phenomenon caused by an excessively small bending radius is easily caused, and particularly, stress concentration, crease generation and other phenomena are more easily caused at the joint of the bending area and the non-bending area, thereby causing circuit damage of the bending area. Through extending the buffer layer bending zone and on attaching to bending zone, from buffering the protection and thickening the whole thickness of bending zone to bending zone, avoided bending zone to appear the dead book. Meanwhile, the buffer layer at the joint of the bending area with the stress concentration and the non-bending area is thicker, so that the stress concentration at the position is reduced, creases are avoided at the position, the screen body of the bending area and the circuit are prevented from being damaged and losing efficacy, and the service life of the display device is prolonged.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A flexible display panel, comprising:
the screen body comprises a display area and a non-display area extending from the display area; the non-display area comprises a bending area and a non-bending area;
a buffer layer; the buffer layer is attached to the lower surface of the screen body, covers the display area and extends out of the display area to cover the bending area; the thickness of the buffer layer close to the joint of the bending area and the non-bending area is a first thickness; the thickness of the buffer layer far away from the connection part is a second thickness; the first thickness is greater than the second thickness, wherein the buffer layer away from the junction comprises the buffer layer attached to a middle portion of the bending region, and the first thickness is further greater than a thickness of the buffer layer attached to the display region and a thickness of the buffer layer attached to the non-bending region;
the end face of the buffer layer, which is close to the bending area, is an uneven curved surface.
2. The flexible display panel of claim 1, wherein the rugged curved surface is a continuous arch; or the uneven curved surface is an irregular wavy undulating structure.
3. The flexible display panel according to claim 1, wherein the buffer layer on the bending region between the bending start line and the bending end line has an engraved structure.
4. The flexible display panel of claim 3, wherein the hollow structure is a plurality of grooves arranged along a width direction of the screen body.
5. The flexible display panel of claim 4, wherein the sidewalls of the recess form a rugged curve.
6. The flexible display panel of any of claims 1-5, wherein the non-display region comprises a first non-display region extending outward along a length of the screen body; the first non-display area comprises a first bending area which can bend towards the lower part of the screen body; the buffer layer extends out of the display area and covers the first bending area.
7. The flexible display panel according to claim 6, wherein the non-display region further comprises a second non-display region and a third non-display region extending to two sides of the screen body along the width direction of the screen body, and the second non-display region comprises a second bending region capable of bending toward the lower side of the screen body; the third non-display area comprises a third bending area which can be bent towards the lower part of the screen body; the buffer layer extends out of the display area and covers the second bending area and the third bending area.
8. The flexible display panel of claim 1, wherein the screen body comprises a flexible substrate, and the buffer layer is a buffer material attached to the flexible substrate.
9. The flexible display panel of claim 8, wherein the buffer layer is foam.
10. A display device, comprising the flexible display panel according to any one of claims 1 to 9, a frame, and a protective cover, wherein the frame is disposed around the flexible display panel; the protective cover plate is attached to the display surface of the flexible display panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810791107.0A CN109087586B (en) | 2018-07-18 | 2018-07-18 | Display device and flexible display panel thereof |
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| CN201810791107.0A CN109087586B (en) | 2018-07-18 | 2018-07-18 | Display device and flexible display panel thereof |
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| CN109087586B true CN109087586B (en) | 2021-05-18 |
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Application publication date: 20181225 Assignee: Yungu (Gu'an) Technology Co., Ltd.|Bazhou Yungu Electronic Technology Co., Ltd.|Kunshan Institute of technology new flat panel display technology center Co., Ltd Assignor: Kunshan Guo Xian Photoelectric Co., Ltd. Contract record no.: X2019990000156 Denomination of invention: Flexible display device and flexible display panel strength auxiliary support structure thereof License type: Common License Record date: 20191030 |
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