CN111857449A - Bent capacitive touch screen and manufacturing method thereof - Google Patents
Bent capacitive touch screen and manufacturing method thereof Download PDFInfo
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- CN111857449A CN111857449A CN202010753887.7A CN202010753887A CN111857449A CN 111857449 A CN111857449 A CN 111857449A CN 202010753887 A CN202010753887 A CN 202010753887A CN 111857449 A CN111857449 A CN 111857449A
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- glass substrate
- touch screen
- capacitive touch
- bending
- bent
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
Abstract
The invention discloses a bent capacitive touch screen and a manufacturing method thereof, and the bent capacitive touch screen comprises a first glass substrate, a second glass substrate and an adhesive layer, wherein the first glass substrate is hot bent glass, the first glass substrate is provided with at least one first bent part formed by hot bending, the first bent part is formed by at least one arc bent part, and the circle center of each arc bent part is positioned on the inner side of the inner side surface of the first glass substrate; the second glass substrate is in a straight state in a natural state, the second glass substrate is closely attached to the inner side face of the first glass substrate through the bonding layer, and the second glass substrate is bent along the arc face of the first bending portion at the first bending portion to form a second bending portion. The stress at the bending part of the bending capacitive touch screen is balanced, and the bending capacitive touch screen has better impact resistance.
Description
Technical Field
The invention relates to the field of touch screens, in particular to a bent capacitive touch screen and a manufacturing method thereof.
Background
Capacitive touch screens typically have a touch circuitry layer fabricated on a glass substrate. In order to improve the impact resistance of the glass substrate, it is generally necessary to perform a strengthening treatment on the glass substrate in advance. A glass substrate subjected to a strengthening treatment generally has a strengthened structure in which a compressive stress exists on the surface and a tensile stress exists inside.
In recent years, a curved capacitive touch panel having a curved panel body has been proposed, and a glass substrate of the capacitive touch panel is generally processed to have a desired curvature by a hot bending method, in which the glass substrate is heated and softened and then bent and shaped.
However, when the strengthened glass substrate is heated and softened, the internal stress is released, so that it is difficult to maintain the original strengthened structure, and the impact resistance of the capacitive touch screen is finally affected. However, the internal structure of the glass substrate after hot bending has a certain unevenness (such as uneven thickness and density), and after the glass substrate is subjected to strengthening treatment, the internal stress is difficult to be uniformly distributed, so that the glass substrate has a risk of spontaneous explosion.
Therefore, the glass substrate of the conventional curved capacitive touch screen is difficult to effectively strengthen, and the curved capacitive touch screen is difficult to have better impact resistance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bent capacitive touch screen and a manufacturing method thereof, wherein the bent part of the bent capacitive touch screen has balanced stress and better impact resistance.
In order to solve the technical problems, the technical scheme is as follows:
a curved capacitive touch screen comprising a first glass substrate, a second glass substrate and an adhesive layer, characterized in that: the first glass substrate is hot bending glass, the first glass substrate is provided with at least one first bending part formed by hot bending, the first bending part is formed by at least one arc bending part, and the circle center of each arc bending part is positioned on the inner side of the inner side face of the first glass substrate; the second glass substrate is in a straight state in a natural state, the second glass substrate is closely attached to the inner side face of the first glass substrate through the bonding layer, and the second glass substrate is bent along the arc face of the first bending portion at the first bending portion to form a second bending portion.
In the curved capacitive touch screen, the first glass substrate has a first curved portion, and the natural state of the second glass substrate is a straight state, so that when the second glass substrate is tightly adhered to the inner side surface of the first glass substrate and forms a second curved portion along the first curved portion, the adhering surfaces of the first glass substrate and the second glass substrate interact with each other, at the moment, the outer side of the first curved portion of the first glass substrate has a compressive stress, and the inner side has a tensile stress; the outer side of the second bending part of the second glass substrate has tensile stress, the inner side of the second bending part has compressive stress, the two tensile stresses are concentrated at the middle joint surface, and the compressive stress is distributed at the outer side and the inner side, so that the bending part of the bending capacitive touch screen has stress distribution similar to that of a common strengthened glass substrate no matter the outer side (the outer side of the first glass substrate) or the inner side (the inner side of the second glass substrate) of the bending capacitive touch screen is compressive stress, and the bending part of the capacitive touch screen has better impact resistance.
Typically, the radius of curvature of the second curved portion is greater than the radius of curvature of the first curved portion.
Preferably, the radius of curvature of the first curved portion is greater than 20 mm. The curvature radius of the first bending part is larger than 20mm, and when the second glass substrate is bonded on the first glass substrate, the second glass substrate can be bent along with the first bending part of the first glass substrate easily without breaking.
In a preferable embodiment, the thickness of the first glass substrate is 0.4 to 0.5 mm.
In a preferable embodiment, the thickness of the second glass substrate is 50 to 200 μm. The thickness of the second glass substrate is set to be 50-200 μm, which can effectively ensure that the second glass substrate can be bent along with the first bending part and can generate proper stress.
In a preferred embodiment, the adhesive layer is an optical adhesive layer. The optical adhesive layer is made of optical adhesive (such as acrylic resin) with high viscosity, preferably optical adhesive cured by ultraviolet light, and the optical adhesive can effectively enable the first glass substrate and the second glass substrate to be firmly bonded, so that the first glass substrate and the second glass substrate are prevented from loosening and maintaining stress.
In a preferred embodiment, the curved capacitive touch screen further includes a touch circuit layer disposed between the inner side surface of the first glass substrate and the outer side surface of the second glass substrate or disposed on the inner side surface of the second glass substrate. In a specific scheme, the touch circuit layer is arranged on the inner side surface of the second glass substrate. Touch-control circuit layer can be in the preparation under the natural state at the second glass substrate, follow the inboard that the second glass substrate glues tightly to first glass substrate at last, at the second flexion, the inboard that the touch-control circuit layer followed the second glass substrate also appears for compressive stress, compressive stress can guarantee that each rete that constitutes the second circuit layer is compressed tightly and not broken by the stretch, its electric conductivity can not receive the destruction, consequently, set up the medial surface at the second glass substrate with touch-control circuit layer, the normal of crooked capacitive touch screen function of assurance that can be better.
In a further preferred embodiment, the touch circuit layer includes a plurality of sensing electrodes and a connection line for connecting the sensing electrodes. The sensing electrode is made of transparent conductive materials (such as ITO, conductive grids and nano silver wire coatings), the connecting wires adopt metal connecting wires (such as connecting wires formed by patterning a metal thin film) arranged on the glass substrate and external connecting wires (such as FPC connecting wires which are connected with the connecting wires on the glass substrate through anisotropic conductive adhesive), and the sensing electrode and the connecting wires form a thin film circuit; when the touch detection device works, the touch position of a touch object can be detected according to the influence of a close touch object (such as a finger) on the capacitance of a sensing electrode (such as the capacitance of a certain sensing electrode to the ground or the capacitance between adjacent sensing electrodes).
In a preferable scheme, the inner side surface or the outer side surface of the second glass substrate is provided with a covering layer or a decorative layer. The covering layer or the decorative layer can be a printed shading ink layer, a graphical dark photosensitive resin coating, a shading film adhered on the flexible cover plate main body, such as a metal foil, or a shading film plated on the flexible cover plate, such as a metal shading film deposited by adopting a film plating technology and an electroplating technology. The decorative layer is arranged on the inner side face or the outer side face of the second glass substrate, and the decorative layer can be manufactured in a natural state on the second glass substrate, so that the glass substrate is convenient to use.
In a preferred embodiment, the first glass substrate is a strengthened glass substrate. The tempered glass substrate can ensure that the first glass substrate keeps a tempered structure in a non-bending area (non-hot bending processing area), and has the stress structure in the bending area, so that the stress distribution of all parts of the first glass substrate is ensured.
A manufacturing method of a bent capacitive touch screen is characterized by comprising the following steps:
step (1), carrying out hot bending processing on a first glass substrate to enable the first glass substrate to be bent inwards and form a first bent part;
step (2), applying a pressing force to the second glass substrate, bending the flat second glass substrate along the cambered surface of the first bending part and tightly attaching the flat second glass substrate to the inner side of the first glass substrate through the bonding layer, so that the second glass substrate forms a second bending part matched with the first bending part;
and (3) after the bonding layer is cured, removing the pressing force to enable the first glass substrate and the second glass substrate to be adaptive to the interaction between the first glass substrate and the second glass substrate to achieve stress balance, and accordingly shaping the first bending part and the second bending part.
In a preferable embodiment, the step (1) further includes fabricating a touch circuit layer on an inner side of the second glass substrate in advance.
The invention has the beneficial effects that: the bent capacitive touch screen is bonded by adopting the first glass substrate with the first arc-shaped part and the flat second glass substrate, so that the stress of the bent part of the bent capacitive touch screen formed by bonding is balanced, and the bent capacitive touch screen has better impact resistance.
Drawings
Fig. 1 is a schematic structural diagram of a curved capacitive touch screen in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a bent portion of a bent capacitive touch screen in embodiment 1 of the present invention;
fig. 3 is a schematic view showing changes in stress applied to a first glass substrate and a second glass substrate in a thickness direction in example 1 of the present invention;
FIG. 4 is a top view of a first glass substrate and a second glass substrate in example 1 of the present invention;
fig. 5 is a top view of a curved capacitive touch screen in embodiment 1 of the invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
example 1
1-5, the curved capacitive touch screen comprises a first glass substrate 1, a second glass substrate 2 and an adhesive layer 3, wherein the first glass substrate 1 is hot-bending glass, and two ends of the first glass substrate 1 are respectively provided with a first bending part 101 formed by hot bending; the second glass substrate 2 is in a flat state in a natural state, the second glass substrate 2 is closely attached to the inner side surface of the first glass substrate 1 through the adhesive layer 3, and at the first bending portion 101, the second glass substrate 2 is bent along the arc surface of the first bending portion 101 to form a second bending portion 4.
The first glass substrate 1 is a tempered glass substrate. The thickness of the first glass substrate 1 was 0.4 mm. The thickness of the second glass substrate 2 was 50 μm.
The adhesive layer 3 is an optical adhesive layer. The optical adhesive layer is made of optical adhesive solidified by ultraviolet light.
The curved capacitive touch screen further comprises a touch circuit layer 5, and the touch circuit layer 5 is arranged on the inner side surface of the second glass substrate 2.
The specific manufacturing method of the bent capacitive touch screen is as follows:
step (1), carrying out hot bending processing on a first glass substrate 1 to enable the first glass substrate 1 to be bent inwards and form a first bent part 101;
step (2), applying a pressing force to the second glass substrate 2, bending the flat second glass substrate 2 along the arc surface of the first bending part 101 and tightly attaching the flat second glass substrate to the inner side of the first glass substrate 1 through the bonding layer 3, so that the second glass substrate 2 forms a second bending part 4 matched with the first bending part 101;
and (3) after the bonding layer 3 is cured, removing the pressing force to enable the first glass substrate 1 and the second glass substrate 2 to be adaptive to the interaction between the first glass substrate and the second glass substrate to achieve stress balance, and accordingly shaping the first bending part 101 and the second bending part 4.
Example 2
In the present embodiment, in the case where the other portions are the same as those in embodiment 1, the difference is that: the thickness of the first glass substrate is 0.5 mm.
Example 3
In the present embodiment, in the case where the other portions are the same as those in embodiment 1, the difference is that: the second glass substrate had a thickness of 200 μm.
Example 4
In the present embodiment, in the case where the other portions are the same as those in embodiment 1, the difference is that: the touch circuit layer is arranged between the inner side surface of the first glass substrate and the outer side surface of the second glass substrate.
Example 5
In the present embodiment, in the case where the other portions are the same as those in embodiment 1, the difference is that: and the inner side surface of the second glass substrate is provided with a covering layer.
Example 6
In the present embodiment, in the case where the other portions are the same as those in embodiment 1, the difference is that: the inner side surface of the second glass substrate is provided with a decorative layer.
Claims (10)
1. A curved capacitive touch screen comprising a first glass substrate, a second glass substrate and an adhesive layer, characterized in that: the first glass substrate is hot bending glass, the first glass substrate is provided with at least one first bending part formed by hot bending, the first bending part is formed by at least one arc bending part, and the circle center of each arc bending part is positioned on the inner side of the inner side face of the first glass substrate; the second glass substrate is in a straight state in a natural state, the second glass substrate is closely attached to the inner side face of the first glass substrate through the bonding layer, and the second glass substrate is bent along the arc face of the first bending portion at the first bending portion to form a second bending portion.
2. The curved capacitive touch screen of claim 1, wherein: the radius of curvature of the first curved portion is greater than 20 mm.
3. The curved capacitive touch screen of claim 1, wherein: the thickness of the first glass substrate is 0.4-0.5 mm.
4. The curved capacitive touch screen of claim 1, wherein: the thickness of the second glass substrate is 50-200 μm.
5. The curved capacitive touch screen of claim 1, wherein: the adhesive layer is an optical adhesive layer.
6. The curved capacitive touch screen of claim 1, wherein: the bent capacitive touch screen further comprises a touch circuit layer, wherein the touch circuit layer is arranged between the inner side surface of the first glass substrate and the outer side surface of the second glass substrate or arranged on the inner side surface of the second glass substrate.
7. The curved capacitive touch screen of claim 6, wherein: the touch circuit layer comprises a plurality of induction electrodes and connecting wires for connecting the induction electrodes.
8. The curved capacitive touch screen of claim 1, wherein: and a covering layer or a decorative layer is arranged on the inner side surface or the outer side surface of the second glass substrate.
9. The curved capacitive touch screen of claim 1, wherein: the first glass substrate is a strengthened glass substrate.
10. A manufacturing method of a bent capacitive touch screen is characterized by comprising the following steps:
step (1), carrying out hot bending processing on a first glass substrate to enable the first glass substrate to be bent inwards and form a first bent part;
step (2), applying a pressing force to the second glass substrate, bending the flat second glass substrate along the cambered surface of the first bending part and tightly attaching the flat second glass substrate to the inner side of the first glass substrate through the bonding layer, so that the second glass substrate forms a second bending part matched with the first bending part;
and (3) after the bonding layer is cured, removing the pressing force to enable the first glass substrate and the second glass substrate to be adaptive to the interaction between the first glass substrate and the second glass substrate to achieve stress balance, and accordingly shaping the first bending part and the second bending part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010753887.7A CN111857449A (en) | 2020-07-30 | 2020-07-30 | Bent capacitive touch screen and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010753887.7A CN111857449A (en) | 2020-07-30 | 2020-07-30 | Bent capacitive touch screen and manufacturing method thereof |
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| CN111857449A true CN111857449A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010753887.7A Pending CN111857449A (en) | 2020-07-30 | 2020-07-30 | Bent capacitive touch screen and manufacturing method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566841A (en) * | 2008-10-31 | 2012-07-11 | 宸鸿光电科技股份有限公司 | Structure of curved capacitive touch control panel |
| TWI619056B (en) * | 2017-05-08 | 2018-03-21 | Curved touch panel and its preparation method | |
| CN207232925U (en) * | 2017-09-19 | 2018-04-13 | 汕头超声显示器有限公司 | A kind of capacitance touch screen with curved surface |
| CN108032595A (en) * | 2017-12-04 | 2018-05-15 | 福耀玻璃工业集团股份有限公司 | A kind of production method of ultra-thin laminated glass and ultra-thin laminated glass |
| CN108153448A (en) * | 2017-12-26 | 2018-06-12 | 信利光电股份有限公司 | A kind of curved touch screen and preparation method thereof |
| CN110489019A (en) * | 2019-07-31 | 2019-11-22 | 汕头超声显示器技术有限公司 | A kind of glass plastic component and preparation method thereof for capacitance touch screen |
| CN116580643A (en) * | 2023-05-16 | 2023-08-11 | 深圳秋田微电子股份有限公司 | Manufacturing method of curved surface display module, curved surface display module and curved surface display screen |
-
2020
- 2020-07-30 CN CN202010753887.7A patent/CN111857449A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566841A (en) * | 2008-10-31 | 2012-07-11 | 宸鸿光电科技股份有限公司 | Structure of curved capacitive touch control panel |
| TWI619056B (en) * | 2017-05-08 | 2018-03-21 | Curved touch panel and its preparation method | |
| CN207232925U (en) * | 2017-09-19 | 2018-04-13 | 汕头超声显示器有限公司 | A kind of capacitance touch screen with curved surface |
| CN108032595A (en) * | 2017-12-04 | 2018-05-15 | 福耀玻璃工业集团股份有限公司 | A kind of production method of ultra-thin laminated glass and ultra-thin laminated glass |
| CN108153448A (en) * | 2017-12-26 | 2018-06-12 | 信利光电股份有限公司 | A kind of curved touch screen and preparation method thereof |
| CN110489019A (en) * | 2019-07-31 | 2019-11-22 | 汕头超声显示器技术有限公司 | A kind of glass plastic component and preparation method thereof for capacitance touch screen |
| CN116580643A (en) * | 2023-05-16 | 2023-08-11 | 深圳秋田微电子股份有限公司 | Manufacturing method of curved surface display module, curved surface display module and curved surface display screen |
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