CN115274808A - Substrate, flexible display panel and preparation method of flexible display panel - Google Patents
Substrate, flexible display panel and preparation method of flexible display panel Download PDFInfo
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- CN115274808A CN115274808A CN202210934193.2A CN202210934193A CN115274808A CN 115274808 A CN115274808 A CN 115274808A CN 202210934193 A CN202210934193 A CN 202210934193A CN 115274808 A CN115274808 A CN 115274808A
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- stretchable
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- 239000000758 substrate Substances 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000005452 bending Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 40
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- -1 polyethylene terephthalate Polymers 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000010409 thin film Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
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- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 6
- 238000001723 curing Methods 0.000 claims description 6
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 6
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005538 encapsulation Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 3
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000001029 thermal curing Methods 0.000 claims description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The invention discloses a substrate, a flexible display panel and a preparation method of the flexible display panel.A flexible stretchable part of the substrate is pre-stretched, so that lines of an OLED device layer, a TFT drive array and a stretch detection circuit layer are not easy to damage when being bent; the flexible display panel in the bending area is folded according to a certain rule, and the shielded pixels are hidden pixels and are not displayed when not bent; the current specific stretching state is obtained through stretching the detection circuit layer, and when the bending area is bent and the hidden pixel unit is not shielded, the hidden pixel is used for displaying so as to improve the display resolution of the bending area; compared with the prior art, on one hand, the bending difficulty of the bending area of the flexible display panel is reduced, and the stress on the OLED light-emitting unit in the bending area is reduced during bending; on the other hand, the hidden pixels are unfolded and folded when the display device is bent, so that the display resolution of the bent area is enhanced, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of flexible display, in particular to a substrate, a flexible display panel and a preparation method of the flexible display panel.
Background
Organic light-emitting diodes (OLEDs) are important in display products because of their excellent characteristics of self-luminescence, wide viewing angle, thinness, low energy consumption, high light-emitting efficiency, flexibility, etc.
With the rapid development of the information age, the display of information becomes an indispensable part of the information industry, and the flexible OLED display has gained wide attention as one of the most potential flexible display technologies. In the current research, the flexible display panel only includes a single layer of display pixels, and when the flexible display panel is bent, the area of the display panel at the bent portion is increased, but the number of the display pixels is kept unchanged, so that the display resolution at the bent portion is reduced, and the display quality of an image is affected.
Therefore, it is necessary to develop a substrate, a flexible display panel and a method for manufacturing the flexible display panel to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems and designs a substrate, a flexible display panel and a preparation method of the flexible display panel.
The invention realizes the purpose through the following technical scheme:
a substrate, comprising:
a rigid substrate;
a flexible substrate; the flexible substrate is connected with the rigid substrate; the flexible substrate comprises a plurality of flexible stretchable substrates and a plurality of flexible non-stretchable substrates, and the flexible stretchable substrates and the flexible non-stretchable substrates are distributed at intervals; the flexible stretchable substrate comprises at least two connected hidden pixel units; when the substrate is in a normal state, the rigid substrate and the flexible non-stretchable substrate are in the same plane, and at least two hidden pixel units are arranged below the flexible non-stretchable substrate in a folding mode; when the substrate is in a bending state, at least one hidden pixel unit is exposed.
Preferably, the flexible stretchable substrate comprises two hidden pixel units, and when the substrate is in a normal state, the two hidden pixel units are folded, and one surface of the two hidden pixel units is attached to the other surface of the substrate.
As another preferred, the flexible stretchable substrate includes three hidden pixel units, and the three hidden pixel units form a triangle after being folded when the substrate is in a normal state.
Preferably, the flexible non-stretchable substrate is made of at least one of polyethylene terephthalate, polyethylene naphthalate and polyimide; the flexible stretchable substrate is made of at least one of polydimethylsiloxane, hydrogenated styrene-butadiene block copolymer and aliphatic aromatic random copolyester.
Flexible display panel, include from the top to the bottom sets gradually:
a thin film encapsulation layer;
an OLED device layer; when the substrate is in a bent state, at least one hidden pixel unit is exposed, and the OLED device layer at the corresponding position displays;
a TFT drive array;
a substrate;
stretching the detection circuit layer;
and stretching the protective layer.
The preparation method of the flexible display panel comprises the following steps:
s1, pre-stretching a flexible stretchable part of a substrate, and sequentially preparing a TFT (thin film transistor) driving array and an OLED (organic light emitting diode) device layer on a first side of the substrate;
s2 preparing a tensile state detection circuit on the second side of the substrate;
and S3, folding the substrate at a pre-stretching position, and hiding the hidden pixel units below the flexible non-stretchable substrate to form the flexible display panel containing the hidden pixels.
Further, a tensile protection layer is also prepared on the second side of the tensile state detection circuit.
Furthermore, the stretching protective layer is a protective adhesive layer formed by ultraviolet light curing adhesive, thermal curing adhesive or normal temperature curing adhesive.
Further, after the OLED device layer is folded, a layer of shaping protective glue is arranged on the first side of the OLED device layer.
Furthermore, the sizing protective adhesive is made of at least one of polydimethylsiloxane, hydrogenated styrene-butadiene block copolymer and aliphatic aromatic random copolyester.
The invention has the beneficial effects that:
1. the flexible stretchable part of the substrate is pre-stretched, so that the lines of the OLED device layer, the TFT drive array and the stretching detection circuit layer are not easy to damage when being bent.
2. Due to the linear relationship between stress and strain in the solid material after being stressed, the stretchable substrate portion can reduce the stress on the device when bent, thereby protecting the OLED device layer.
3. The flexible display panel in the bending area is folded according to a certain rule, and the pixels shielded after folding are hidden pixels and are not displayed when not bent. The current specific stretching state is obtained through the stretching detection circuit layer, and when the bending area is bent and the hidden pixel unit is not shielded, the hidden pixel is used for displaying so as to improve the display resolution of the bending area. Compared with the prior art, the bending difficulty of the bending area of the flexible display panel is reduced on one hand, and the stress on the OLED light-emitting unit in the bending area is reduced when the flexible display panel is bent. On the other hand, the hidden pixels are unfolded and folded when the display screen is bent, so that the display resolution of the bent area is enhanced, and the product quality is improved.
Drawings
Fig. 1 is a flow chart of a method for manufacturing a substrate of a flexible display device according to the present invention;
FIG. 2 is a schematic diagram of a side view of a substrate with a combination of flexible stretchable and non-stretchable at a bend according to the present invention;
FIG. 3 is a schematic side view of a substrate according to an embodiment of the present invention when the substrate is not bent;
FIG. 4 is a schematic side view of a substrate according to an embodiment of the present invention when being bent;
FIG. 5 is a schematic side view of a substrate with a large bending degree according to an embodiment of the present invention;
FIG. 6 is a schematic side view of an unbent substrate according to an embodiment of the present invention;
fig. 7 is a cross-sectional view of a flexible display panel according to an embodiment of the present invention;
the reference numbers in the figures are: the display device comprises a 1-flexible stretchable substrate, a 2-flexible non-stretchable substrate, a 3-hidden pixel a, a 4-hidden pixel b, a 5-hidden pixel c, a 6-first rigid substrate, a 7-second rigid substrate, an 8-thin film packaging layer, a 9-OLED device layer, a 10-TFT drive array, an 11-substrate, a 12-stretching detection circuit layer and a 13-stretching protection layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The following describes in detail embodiments of the present invention with reference to the drawings.
Example 1
A substrate 11, comprising:
a first rigid substrate 6, a second rigid substrate 7, as shown in fig. 2;
a flexible substrate 11; two ends of the flexible substrate 11 are respectively connected with one end of the first rigid substrate 6 and one end of the second rigid substrate 7; as shown in fig. 3, the flexible substrate 11 includes four flexible stretchable substrates 1 and three flexible non-stretchable substrates 2, and the flexible stretchable substrates 1 and the flexible non-stretchable substrates 2 are distributed at intervals; the flexible stretchable substrate 1 comprises three connected hidden pixel cells; as shown in fig. 3, when the substrate 11 is in a normal state, the first rigid substrate 6, the second rigid substrate 7, and the three flexible and non-stretchable substrates 2 are in the same plane, the three hidden pixel units are folded and disposed below the flexible and non-stretchable substrate 2, and a triangle is defined by the folded three hidden pixel units; as shown in fig. 4, when the substrate 11 is in the bent state, the hidden pixel b4 is exposed and displayed, and the hidden pixels a3 and c5 are not displayed. The three hidden pixel units can respectively correspond to the display hidden pixel a3, the hidden pixel b4 and the hidden pixel c5;
example 2
As shown in fig. 6, different from embodiment 1, the flexible stretchable substrate 1 includes two hidden pixel units, and when the substrate 11 is in a normal state, the two hidden pixel units are folded and one surface of the two hidden pixel units is attached to each other. The two hidden pixel units can respectively correspond to the display hidden pixel a3 and the hidden pixel b4; when the flexible display panel is not bent, the folding mode is simpler, and a more suitable folding mode can be set according to a specific application scene, so that the display quality is further improved;
as shown in fig. 5, which is a schematic side view of the flexible display panel when the flexible display panel is bent to a larger degree, at this time, the flexible substrate 11 is bent to an arc shape, and all of the flexible non-stretchable substrate 2, the hidden pixel a3, the hidden pixel b4, and the hidden pixel c5 are displayed.
According to the two embodiments, the display area is increased after bending, but the number of pixels is unchanged, and the number of pixels at the bending position is increased in a regulated manner when the bending is carried out at different degrees, so that the display resolution at the bending position is enhanced, and the display quality of an image is improved.
In some embodiments, the flexible non-stretchable substrate 2 is made of at least one of polyethylene terephthalate, polyethylene naphthalate, and polyimide; the flexible stretchable substrate 1 is made of at least one of polydimethylsiloxane, hydrogenated styrene-butadiene block copolymer and aliphatic aromatic random copolyester.
As shown in fig. 7, the flexible display panel includes, sequentially from top to bottom:
a thin film encapsulation layer 8;
an OLED device layer 9; when the substrate 11 is in a bent state, at least one hidden pixel unit is exposed, and the corresponding OLED device layer 9 displays;
a TFT drive array 10; the TFT driving array 10 includes a plurality of TFTs, which may be indium gallium zinc oxide semiconductor (IGZO) TFTs, low temperature polysilicon TFTs, or other TFTs commonly used in the art;
a substrate 11;
a stretch detection circuit layer 12 sensitive to stretch and bend; for detecting the specific stretching state of the bending zone the protective layer 13 is stretched.
Insulating layers are respectively arranged between the layers.
As shown in fig. 1, the method for manufacturing a flexible display panel includes the steps of:
s1, pre-stretching a flexible stretchable part of a substrate 11, and sequentially preparing a TFT drive array 10 and an OLED device layer 9 on a first side of the substrate 11; through the pre-stretching process, the bending resistance of each layer of routing can be improved, and the conductive performance of the bent circuit is kept;
s2, preparing a stretching state detection circuit on the second side of the substrate 11;
and S3, folding the substrate 11 at a pre-stretched position, and hiding the hidden pixel units below the flexible and non-stretchable substrate 2 to form the flexible display panel containing the hidden pixels.
A stretch protection layer 13 is also prepared on the second side of the stretch state detection circuit. The stretching protective layer 13 is a protective adhesive layer formed by ultraviolet light curing adhesive, thermal curing adhesive or normal temperature curing adhesive.
After the OLED device layer 9 is folded, a layer of sizing protective glue is disposed on the first side thereof. The sizing protective adhesive is prepared from at least one of polydimethylsiloxane, hydrogenated styrene-butadiene block copolymer and aliphatic aromatic random copolyester. The setting of design protection glue is fixed peculiar folding form to protect the bending region when buckling.
And a thin film packaging layer 8 is also arranged on the first side of the shaping protective adhesive. The thin film encapsulation layer 8 is used to prevent external water oxygen from entering the device interior and degrading the performance of the OLED device layer 9.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A substrate, comprising:
a rigid substrate;
a flexible substrate; the flexible substrate is connected with the rigid substrate; the flexible substrate comprises a plurality of flexible stretchable substrates and a plurality of flexible non-stretchable substrates, and the flexible stretchable substrates and the flexible non-stretchable substrates are distributed at intervals; the flexible stretchable substrate comprises at least two connected hidden pixel units; when the substrate is in a normal state, the rigid substrate and the flexible non-stretchable substrate are in the same plane, and at least two hidden pixel units are arranged below the flexible non-stretchable substrate in a folding mode; when the substrate is in a bending state, at least one hidden pixel unit is exposed.
2. The substrate according to claim 1, wherein the flexible stretchable substrate comprises two hidden pixel units, and when the substrate is in a normal state, the two hidden pixel units are folded and one surface is attached.
3. The substrate of claim 1, wherein the flexible stretchable substrate comprises three hidden pixel units, and the three hidden pixel units form a triangle after being folded when the substrate is in a normal state.
4. The substrate according to claim 1, wherein the flexible non-stretchable substrate is made of at least one of polyethylene terephthalate, polyethylene naphthalate, and polyimide; the flexible stretchable substrate is made of at least one of polydimethylsiloxane, hydrogenated styrene-butadiene block copolymer and aliphatic aromatic random copolyester.
5. Flexible display panel, its characterized in that includes and sets gradually from top to bottom:
a thin film encapsulation layer;
an OLED device layer; when the substrate is in a bent state, at least one hidden pixel unit is exposed, and the OLED device layer at the corresponding position displays;
a TFT drive array;
the substrate of any one of claims 1-4;
stretching the detection circuit layer;
and stretching the protective layer.
6. The preparation method of the flexible display panel is characterized by comprising the following steps:
s1, pre-stretching a flexible stretchable part of a substrate, and sequentially preparing a TFT (thin film transistor) driving array and an OLED (organic light emitting diode) device layer on a first side of the substrate;
s2, preparing a stretching state detection circuit on the second side of the substrate;
and S3, folding the substrate at a pre-stretching position, and hiding the hidden pixel units below the flexible non-stretchable substrate to form the flexible display panel containing the hidden pixels.
7. The method of manufacturing a flexible display panel according to claim 6, wherein a stretch protection layer is further formed on the second side of the stretched state detection circuit.
8. The method for manufacturing a flexible display panel according to claim 7, wherein the stretching protective layer is a protective adhesive layer made of an ultraviolet light curing adhesive, a thermal curing adhesive or a normal temperature curing adhesive.
9. The method of claim 6, wherein a layer of patterned protective glue is applied to the first side of the OLED device layer after the OLED device layer is folded.
10. The method of claim 9, wherein the sizing protective adhesive is at least one of polydimethylsiloxane, hydrogenated styrene-butadiene block copolymer, and aliphatic aromatic random copolyester.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210934193.2A CN115274808A (en) | 2022-08-04 | 2022-08-04 | Substrate, flexible display panel and preparation method of flexible display panel |
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| CN202210934193.2A CN115274808A (en) | 2022-08-04 | 2022-08-04 | Substrate, flexible display panel and preparation method of flexible display panel |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110268462A (en) * | 2019-05-10 | 2019-09-20 | 京东方科技集团股份有限公司 | Stretchable display equipment and image display driving method |
| CN111613132A (en) * | 2019-02-26 | 2020-09-01 | 昆山工研院新型平板显示技术中心有限公司 | Stretchable display screen and display device |
| CN111951678A (en) * | 2020-08-11 | 2020-11-17 | 上海天马微电子有限公司 | Display panel and display device |
| CN113471237A (en) * | 2021-06-29 | 2021-10-01 | 武汉华星光电技术有限公司 | Flexible display panel, manufacturing method and electronic device |
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- 2022-08-04 CN CN202210934193.2A patent/CN115274808A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111613132A (en) * | 2019-02-26 | 2020-09-01 | 昆山工研院新型平板显示技术中心有限公司 | Stretchable display screen and display device |
| CN110268462A (en) * | 2019-05-10 | 2019-09-20 | 京东方科技集团股份有限公司 | Stretchable display equipment and image display driving method |
| CN111951678A (en) * | 2020-08-11 | 2020-11-17 | 上海天马微电子有限公司 | Display panel and display device |
| CN113471237A (en) * | 2021-06-29 | 2021-10-01 | 武汉华星光电技术有限公司 | Flexible display panel, manufacturing method and electronic device |
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Application publication date: 20221101 |