CN108648632B - Flexible display device and display apparatus - Google Patents
Flexible display device and display apparatus Download PDFInfo
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- CN108648632B CN108648632B CN201810788204.4A CN201810788204A CN108648632B CN 108648632 B CN108648632 B CN 108648632B CN 201810788204 A CN201810788204 A CN 201810788204A CN 108648632 B CN108648632 B CN 108648632B
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- 238000005452 bending Methods 0.000 claims abstract description 74
- 230000005611 electricity Effects 0.000 claims abstract description 9
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 238000009503 electrostatic coating Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 abstract description 25
- 230000007935 neutral effect Effects 0.000 description 35
- 239000000463 material Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 238000013021 overheating Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
Classifications
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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 present invention relates to a flexible display device and a display apparatus. The flexible display device includes a display region, and a non-display region adjacent to the display region; the non-display area comprises a bending area adjacent to the display area and an extension area adjacent to the bending area; the flexible display device includes; a display screen body; the support layer is positioned on the back surface of the display screen body and comprises a first support sheet positioned in the display area and a second support sheet with one end fixedly connected with the first support sheet, one end of the second support sheet is positioned in the bending area, and the other end of the second support sheet is positioned in the extension area; the first support sheet is fixedly connected to the back of the display screen body, and the second support sheet is adsorbed to the back of the display screen body through static electricity; the second supporting sheet can rotate along the boundary line between the display area and the non-display area when driven so as to be separated from the display screen body. The flexible display device can avoid damage to the display screen body in the bending process, so that the screen body is not good in the bending process.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display device and a display device.
Background
With the development of display technology, flexible display technology is increasingly used. However, in the process of bending the screen body of the conventional flexible display device, the bending region is subjected to stress, and when the device in the bending region is subjected to strain exceeding the critical strain of the device, the device can break and fail, so that the electrical failure of the display screen body is caused, and the screen body is poor.
Disclosure of Invention
Based on this, it is necessary to provide a flexible display device and a display apparatus capable of avoiding the poor panel during bending, aiming at how to avoid the poor panel during bending.
A flexible display device comprising a display region, a non-display region contiguous with the display region; the non-display area comprises a bending area adjacent to the display area and an extension area adjacent to the bending area;
the flexible display device includes;
a display screen body;
the support layer is positioned on the back surface of the display screen body and comprises a first support sheet positioned in the display area and a second support sheet with one end fixedly connected with the first support sheet, one end of the second support sheet is positioned in the bending area, and the other end of the second support sheet is positioned in the extension area;
the first support sheet is fixedly connected to the back surface of the display screen body, and the second support sheet is adsorbed to the back surface of the display screen body through static electricity;
the second supporting plate can rotate along the boundary line between the display area and the non-display area when driven so as to be separated from the display screen body.
In one embodiment, the second supporting piece is provided with a hollow area, and the hollow area is located in the bending area.
In one embodiment, the bending area includes a wiring area, and the projection of the hollowed-out area on the display screen body covers the projection of the wiring area on the display screen body.
In one embodiment, the projection area of the hollowed-out area on the display screen body is larger than the projection area of the wiring area on the display screen body.
In one embodiment, the hollowed-out area includes a plurality of hollowed-out sub-areas uniformly distributed in the bending area.
In one embodiment, the hollowed-out subarea is circular, triangular or rectangular in shape.
In one embodiment, an electrostatic coating is disposed between the second support sheet and the back surface of the display screen body, and the electrostatic coating is located on the second support sheet or the back surface of the display screen body.
In one embodiment, the first support piece and the second support piece are integrally formed.
In one embodiment, the flexible display device further includes a module structure located at a display surface side of the display screen body.
In addition, a display device is provided, which comprises the flexible display device.
When the flexible display device is used, the second support sheet and the display screen body can be respectively bent, namely, the second support sheet is separated from the display screen body, so that the second support sheet is bent; and then bending the display screen body, wherein the second support sheet is still adsorbed on the back surface of the display screen body through static electricity after bending. Therefore, in the bending process, the second supporting sheet and the display screen body are mutually independent and respectively provided with a neutral layer, so that the distance between the wiring area of the screen body and the neutral layer of the display screen body is relatively close, and the distance between the lower surface of the second supporting sheet and the neutral layer of the second supporting sheet is relatively close. The strain of the material at the neutral layer or the position near the neutral layer is relatively small, so that the display screen body and the second supporting sheet are prevented from being damaged due to overlarge stress in the bending process, and the defect of the screen body in the bending process is effectively avoided.
When the display device of the technical scheme is applied, the second supporting sheet and the display screen body can be respectively bent when the flexible display device is bent, namely, the second supporting sheet is separated from the display screen body, so that the bending of the second supporting sheet is realized; and then bending the display screen body, wherein the second support sheet is still adsorbed on the back surface of the display screen body through static electricity after bending. Therefore, in the bending process, the second supporting sheet and the display screen body are mutually independent and respectively provided with a neutral layer, so that the distance between the wiring area of the screen body and the neutral layer of the display screen body is relatively close, and the distance between the lower surface of the second supporting sheet and the neutral layer of the second supporting sheet is relatively close. The strain of the material at the neutral layer or the position near the neutral layer is relatively small, so that the display screen body and the second supporting sheet are prevented from being damaged due to overlarge stress in the bending process, and the defect of the screen body in the bending process is effectively avoided.
Drawings
Fig. 1 is a schematic view of a conventional flexible display device before bending;
FIG. 2 is a front view of a flexible display device according to an embodiment of the present invention before bending;
FIG. 3 is a schematic diagram of a flexible display device according to an embodiment of the invention after bending a supporting layer and before bending a display screen body;
FIG. 4 is a schematic diagram of a flexible display device according to an embodiment of the present invention after bending;
fig. 5 is a bottom view of a flexible display device according to an embodiment of the present invention before bending.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed 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. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a conventional flexible display device 100 'includes a support layer 110', a display screen body 120', and a module structure 130' stacked. The supporting layer 110 'is fixedly connected to the back surface of the display screen body 120', and the fixing connection is usually made of organic adhesive.
Wherein the conventional flexible display device 100 'includes a display area 140', and a non-display area 150 'adjacent to the display area 140'. The non-display region 150' includes a inflection region 151' adjacent to the display region 140' and an extension region 152' adjacent to the inflection region 151 '.
When bending the bending region 151' of the conventional flexible display device 100', since the supporting layer 110' is fixedly connected to the rear surface of the display screen body 120', the bending region 151' has only one neutral layer.
According to the principle of mechanical neutral layer stress, the material at the neutral layer or the position near the neutral layer is relatively less strained. Whereas the material far from the neutral layer is subjected to relatively large strains. The distance of the neutral layer of the bending region 151 'of the conventional flexible display device 100' from the bottom end is calculated as follows.
The thickness of the display screen body 120 'is about 20 μm and the Young's modulus is 9GPa. The thickness of the support layer 110 'is typically 50 μm to 150 μm (based on a mean value of 75 μm) and the Young's modulus is 4GPa. Namely E 1 ＝4GPa，t 1 ＝50μm；E 2 ＝9GPa，t 2 ＝20μm。
The position of the neutral layer of the bending region of the conventional flexible display device 100' is calculated by using the following calculation formula:
wherein E is the elastic modulus, t is the thickness, and b is the distance from the neutral layer to the bottom end.
The calculation result is as follows: the neutral layer of inflection zone 151' (located at the dashed line a ' in fig. 1) is 55 μm from the lower surface of support layer 110 '. And is located at a distance of about 40 μm from the wiring region (the position of the broken line B' in fig. 1), and is further away. Therefore, the stress applied to the bending region 151 'is relatively large during the bending process, so that defects such as wire breakage may occur, and further, electrical failure of the display screen 120' may be caused, resulting in poor screen. At the same time, the distance between the lower surface of the supporting layer 110' and the neutral layer is 55 μm, and there is also a risk of damage during bending.
Therefore, the invention provides the flexible display device and the display device which can avoid the bad screen body in the bending process.
Referring to fig. 2 to 4, the flexible display device 100 according to an embodiment of the present invention includes a display Area (AA Area) 110 and a non-display Area (non-AA Area) 120 adjacent to the display Area 110. The non-display region 120 includes a inflection region 121 adjacent to the display region 110, and an extension region 122 adjacent to the inflection region 121.
Wherein the flexible display device 100 includes a display screen body 130 and a support layer 140. The flexible display device 100 may be, for example, a flexible Organic Light Emitting Diode (OLED) display or the like.
The display region 110 is a region for display, and a light emitting layer or the like is provided in the display region 110. Note that the display area 110 may be displayed in its entirety, or may include a region that is not displayed, such as a frame. It can be appreciated that the display screen 130 in the flexible display device provided by the present invention may be a full-screen display, or may be a display screen with a common frame or a narrow frame. In addition, the display area 110 is a non-inflection area.
The non-display area 120 is located outside the display area 110, and includes circuits such as signal lines and display driver circuits. When flexed, the non-display area 120 visible from the front side may be minimized by bending portions of the flexible display device 100 to the back side along the boundary between the display area 110 and the non-display area 120, resulting in a flexed flexible display device 100.
Wherein the supporting layer 140 is located at the back of the display screen 130. The supporting layer 140 includes a first supporting sheet 141 positioned in the display area 110 and a second supporting sheet 142 having one end fixedly connected to the first supporting sheet 141. One end of the second supporting piece 142 is located in the bending area 121, and the other end of the second supporting piece 142 is located in the extending area 122.
The first supporting piece 141 is fixedly connected to the back surface of the display screen 130. For example, the fixing may be by bonding with the organic glue 150. The second supporting sheet 142 is attached to the back surface of the display screen 130 by static electricity.
The second supporting plate 142 is driven to rotate along the boundary between the display area 110 and the non-display area 120, so as to be separated from the display screen 130. For example, a mechanical force is applied to the second supporting plate 142, and when the mechanical force is greater than the electrostatic attraction force, the second supporting plate 142 may be separated from the display screen body 130.
Wherein a chip may be disposed in the extension region 122. In this embodiment, the extension region 122 is located at the lower side of the display region 110 and is parallel to the display region 110, as shown in fig. 2. Of course, the extension region 122 is not limited thereto.
The bending process of the flexible display device 100 of the present invention will be specifically described with reference to the accompanying drawings.
Referring to fig. 2, before the flexible display device 100 is bent, the second supporting sheet 142 is electrostatically attracted to the back surface of the display screen 130. And then separating the second supporting sheet 142 from the display screen body 130, and bending the second supporting sheet 142 to a target extent to realize bending of the second supporting sheet 142, as shown in fig. 3. At this time, the display screen body 130 remains stationary. After the folded second supporting sheet 142 is positioned, the display screen 130 is folded towards the back until the second supporting sheet 142 is attached to the outer surface of the folded second supporting sheet, as shown in fig. 4.
In the above-mentioned bending process, the second supporting sheet 142 and the display screen 130 are independent from each other, and each of them has a neutral layer, so that the distance between the screen wiring area (a position in fig. 2) and the neutral layer of the display screen is relatively close, and the distance between the lower surface of the second supporting sheet and the neutral layer of the second supporting sheet is relatively close. The material at the neutral layer or the position near the neutral layer is relatively less in strain, so that damage to the display screen 130 and the second supporting sheet 142 caused by overlarge stress in the bending process can be avoided, and poor display screen in the bending process can be effectively avoided.
On the basis of the foregoing embodiment, referring to fig. 5, the second supporting piece 142 has a hollowed-out area 143, and the hollowed-out area 143 is located in the bending area 121. According to the formula: the small thickness of the hollowed-out area 143 can reduce the strain, improve the protection of the bending area 121 in the process and reduce the damage to the bending part of the screen body.
Based on the foregoing embodiment, the bending area 121 includes the wiring area 123, and the projection of the hollowed-out area 143 on the display screen 130 covers the projection of the wiring area 123 on the display screen 130. On the one hand, the possibility of wire breakage is reduced by reducing the strain born by the wires in the hollow area 143, the protection of the bending area in the process is improved, and the damage to the bending part of the screen body is reduced; on the other hand, the back of the display screen 130 is exposed in the hollowed-out area 143, which is favorable for heat dissipation and prevents the damage of the circuit caused by overheating from failing the screen.
Based on the foregoing embodiment, the projection area of the hollowed-out area 143 on the display screen body 130 is larger than the projection area of the wiring area 123 on the display screen body 130. Therefore, the back of the display screen 130 where the wiring area 123 is located is not shielded completely, so that heat generated by wiring can be fully dissipated, and line damage caused by overheating and screen failure are effectively prevented.
It should be noted that the form and the position of the hollowed-out area are not limited thereto. The position of the hollowed-out area can be set according to specific requirements.
In another embodiment, the hollowed-out area includes a plurality of hollowed-out sub-areas (not shown) uniformly distributed in the bending area. On one hand, the possibility of reducing the breakage of the wiring is realized by reducing the strain born by the wiring of the hollowed-out subareas, the protection of the bending area in the process is improved, and the damage to the bending part of the screen body is reduced; on the other hand, the back of the display screen body is exposed in the hollowed-out subareas, so that heat dissipation is facilitated, and line damage caused by overheating and failure of the screen body are prevented. In addition, the hollowed-out subareas are mutually independent, so that the supporting strength of the second supporting piece is ensured.
In addition, insulating treatment can be carried out on the back surface of the display screen body exposed at the position of the hollowed-out area, so that static electricity can be prevented from being conducted into the flexible display device.
On the basis of the foregoing embodiment, the hollowed-out sub-area is circular, triangular or rectangular in shape. The shapes of the hollowed-out subareas can be the same or different. Of course, the hollow area may be circular, triangular or rectangular.
In addition to the foregoing embodiments, an electrostatic coating 160 is disposed between the second support sheet 142 and the back surface of the display screen body 130, and the electrostatic coating 160 is disposed on the second support sheet 142 or the back surface of the display screen body 130. The electrostatic coating 160 is used for providing electrostatic attraction between the second supporting sheet 142 and the display screen body 130. The electrostatic coating 160 may be silicone oil or the like. The electrostatic coating 160 may be formed on the second support sheet 142 or the rear surface of the display screen body 130 by coating.
Preferably, the electrostatic coating 160 has the same thickness as the organic paste 150 (between the first supporting sheet 141 and the display screen body 130). This is advantageous in maintaining the flatness of the support layer 140.
It should be noted that the electrostatic coating 160 may be located on the second supporting sheet 142, may be located on the back surface of the display screen body 130, or may be located on the second supporting sheet 142, where a part of the electrostatic coating 160 is located on the back surface of the display screen body 130, and the rest of the electrostatic coating 160 is located on the back surface of the display screen body 130.
In addition to the above embodiment, the first supporting piece 141 and the second supporting piece 142 are integrally formed. This can simplify the process of assembling the support layer 140 and the display screen body 130, and is beneficial to saving the cost.
In addition to the foregoing embodiments, the flexible display device 100 further includes a module structure 170 located on the display surface side of the display screen body 130. The module structure 170 includes a barrier film, a touch screen (TP), a Polarizer (POL), a cover plate, and the like, which are stacked on the display screen body 130.
When the flexible display device is used, the second support sheet and the display screen body can be respectively bent, namely, the second support sheet is separated from the display screen body, so that the second support sheet is bent; and then bending the display screen body, wherein the second support sheet is still adsorbed on the back surface of the display screen body through static electricity after bending. Therefore, in the bending process, the second supporting sheet and the display screen body are mutually independent and respectively provided with a neutral layer, so that the distance between the wiring area of the screen body and the neutral layer of the display screen body is relatively close, and the distance between the lower surface of the second supporting sheet and the neutral layer of the second supporting sheet is relatively close. The strain of the material at the neutral layer or the position near the neutral layer is relatively small, so that the display screen body and the second supporting sheet are prevented from being damaged due to overlarge stress in the bending process, and the defect of the screen body in the bending process is effectively avoided.
A display device of an embodiment includes the flexible display device described above.
When the display device of the technical scheme is applied, the second supporting sheet and the display screen body can be respectively bent when the flexible display device is bent, namely, the second supporting sheet is separated from the display screen body, so that the bending of the second supporting sheet is realized; and then bending the display screen body, wherein the second support sheet is still adsorbed on the back surface of the display screen body through static electricity after bending. Therefore, in the bending process, the second supporting sheet and the display screen body are mutually independent and respectively provided with a neutral layer, so that the distance between the wiring area of the screen body and the neutral layer of the display screen body is relatively close, and the distance between the lower surface of the second supporting sheet and the neutral layer of the second supporting sheet is relatively close. The strain of the material at the neutral layer or the position near the neutral layer is relatively small, so that the display screen body and the second supporting sheet are prevented from being damaged due to overlarge stress in the bending process, and the defect of the screen body in the bending process is effectively avoided.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A flexible display device, wherein the flexible display device comprises a display region, and a non-display region adjacent to the display region; the non-display area comprises a bending area adjacent to the display area and an extension area adjacent to the bending area;
the flexible display device includes;
a display screen body;
the support layer is positioned on the back surface of the display screen body and comprises a first support sheet positioned in the display area and a second support sheet with one end fixedly connected with the first support sheet, one end of the second support sheet is positioned in the bending area, and the other end of the second support sheet is positioned in the extension area;
the first support sheet is fixedly connected to the back surface of the display screen body, and the second support sheet is adsorbed to the back surface of the display screen body through static electricity;
the second supporting sheet can rotate along the boundary line between the display area and the non-display area when driven so as to be separated from the display screen body;
after the second supporting sheet is bent, the display screen body is attached to the outer surface of the second supporting sheet after being bent.
2. The flexible display device of claim 1, wherein the second support sheet has a hollowed-out area thereon, the hollowed-out area being located within the bending area.
3. The flexible display device of claim 2, wherein the inflection region comprises a wiring region, and wherein a projection of the hollowed-out region onto the display screen body covers a projection of the wiring region onto the display screen body.
4. A flexible display device as claimed in claim 3, characterized in that the projected area of the hollowed-out area on the display screen body is larger than the projected area of the wiring area on the display screen body.
5. The flexible display device of claim 2, wherein the hollowed-out region comprises a plurality of hollowed-out sub-regions uniformly distributed within the inflection region.
6. A flexible display device as claimed in claim 5, characterized in that the hollowed-out sub-area is circular, triangular or rectangular in shape.
7. A flexible display device as claimed in claim 1, characterized in that an electrostatic coating is provided between the second support sheet and the back side of the display screen body, the electrostatic coating being located on the second support sheet or the back side of the display screen body.
8. A flexible display device as recited in claim 1, wherein the first support sheet is integrally formed with the second support sheet.
9. The flexible display device of claim 1, further comprising a modular structure on a display surface side of the display screen body.
10. A display apparatus comprising a flexible display device as claimed in any one of claims 1 to 9.
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| CN201810788204.4A CN108648632B (en) | 2018-07-18 | 2018-07-18 | Flexible display device and display apparatus |
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| CN201810788204.4A CN108648632B (en) | 2018-07-18 | 2018-07-18 | Flexible display device and display apparatus |
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| CN109215511B (en) | 2018-10-22 | 2021-09-21 | 京东方科技集团股份有限公司 | Preparation method of flexible display panel, flexible display panel and display device |
| CN111326069A (en) * | 2018-12-17 | 2020-06-23 | 上海和辉光电有限公司 | Flexible display device and mobile terminal |
| CN109728201B (en) | 2019-01-17 | 2022-04-12 | 京东方科技集团股份有限公司 | Gasket for display device and display device |
| KR20200124163A (en) * | 2019-04-22 | 2020-11-02 | 삼성디스플레이 주식회사 | Rollable display device |
| JP7404406B2 (en) * | 2019-06-26 | 2023-12-25 | アプライド マテリアルズ インコーポレイテッド | Flexible multilayer cover lens laminate for foldable display |
| CN110400520B (en) * | 2019-07-25 | 2022-02-01 | 京东方科技集团股份有限公司 | Support piece structure, manufacturing method thereof and folding display screen |
| CN110571200A (en) * | 2019-09-20 | 2019-12-13 | 清华大学 | Sunken flexible circuit integrated device and manufacturing method thereof |
| CN111129095B (en) * | 2019-12-27 | 2023-07-28 | 武汉华星光电半导体显示技术有限公司 | Display and operation method thereof |
| WO2021171807A1 (en) * | 2020-02-28 | 2021-09-02 | 住友化学株式会社 | Optical layered body and flexible image display device |
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| TWI622832B (en) * | 2017-05-23 | 2018-05-01 | 元太科技工業股份有限公司 | Carrier apparatus and display |
| CN207589026U (en) * | 2017-09-06 | 2018-07-06 | 深圳市达创威视科技有限公司 | Integral type hard disk video recorder |
| CN107767775A (en) * | 2017-11-30 | 2018-03-06 | 昆山国显光电有限公司 | Flexible Displays module |
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|---|---|
| CN108648632A (en) | 2018-10-12 |
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Application publication date: 20181012 Assignee: YUNGU (GU'AN) TECHNOLOGY Co.,Ltd.|BAZHOU YUNGU ELECTRONIC TECHNOLOGY Co.,Ltd.|KUNSHAN NEW FLAT PANEL DISPLAY TECHNOLOGY CENTER Co.,Ltd. Assignor: KUNSHAN GO-VISIONOX OPTO-ELECTRONICS Co.,Ltd. Contract record no.: X2019990000156 Denomination of invention: Flexible display device and display device License type: Common License Record date: 20191030 |
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