CN112748825B - Capacitive touch display device with shielding function - Google Patents
Capacitive touch display device with shielding function Download PDFInfo
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- CN112748825B CN112748825B CN202110074864.8A CN202110074864A CN112748825B CN 112748825 B CN112748825 B CN 112748825B CN 202110074864 A CN202110074864 A CN 202110074864A CN 112748825 B CN112748825 B CN 112748825B
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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
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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
- G06F3/0412—Digitisers structurally integrated in a display
Abstract
According to the capacitive touch display device with the shielding function, which is adopted by the invention, the capacitive touch display device is of a multilayer structure formed by laminating the liquid crystal screen glass layer, the touch control glass layer and the cover glass layer, wherein the touch control glass layer is positioned between the liquid crystal screen glass layer and the cover glass layer, and the capacitive touch function circuit layer and the shielding film layer are formed on the surface and the bottom glass layer of the touch control glass, so that the shielding layer and the capacitive touch function circuit layer are directly manufactured on two sides of the touch control glass without additionally adding conductive glass or conductive films to realize electromagnetic compatibility, and the shielding effect under special display is realized on the premise of not increasing the thickness of display equipment and not improving the manufacturing cost of the display equipment.
Description
Technical Field
The invention belongs to the technical field of special display, and particularly relates to a capacitive touch display device with a shielding function.
Background
The capacitive touch screen has been widely used in various fields such as electronic consumption and industrial control, because of its multi-touch and stable and smooth touch effect, instead of the conventional resistive touch screen. When an operator touches the capacitive touch screen, a coupling current is generated between a finger of the capacitive touch screen and an electrode of an induction layer of the touch screen due to capacitive coupling, the finger absorbs a current from a contact position, the current flows out from the electrodes on four corners of the touch screen, and the touch position of the user is obtained through calculation of the four currents.
In the field of special display, the adoption of a capacitive display screen instead of a resistive screen also becomes a trend of technical innovation. However, the special display field has certain requirements for electromagnetic compatibility of the device. That is, it is required that a device or system in the special display field has the capability of operating in compliance with the requirements in its electromagnetic environment without generating intolerable electromagnetic interference to any other device in its environment.
In the existing special display device, limited by the touch control principle of the capacitive touch screen, conductive circuits in the X and Y directions need to be manufactured on the front and back sides of the touch glass of the capacitive touch screen in a printing or carving manner. However, the cover glass of the touch panel cannot be shielded. Therefore, in order to achieve the electromagnetic compatibility effect, ITO conductive glass or a conductive film is required to be used as a shielding layer on the back surface of the capacitive touch screen while the conductive lines in the X and Y directions are manufactured. As can be seen, in order to realize the shielding function in the prior art, an additional conductive glass or conductive film is required to be introduced, which directly affects the thickness of the touch display device and increases the weight of the device; on the other hand, the production cost of the device is obviously increased, and the actually produced display device is high in cost and has no application advantages.
In view of the above, the prior art should be improved to solve the technical problem that the special display device in the prior art lacks an effective shielding means.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a touch display device which can be used for manufacturing a capacitive touch function circuit and a shielding film layer on two sides of touch glass respectively, so that electromagnetic compatibility is realized, meanwhile, the touch display device on special display is lighter and thinner, and the production cost of the device is reduced.
In order to solve the technical problems, the capacitive touch display device with the shielding function is a multilayer structure formed by laminating a liquid crystal screen glass layer, a touch control glass layer and a cover glass layer, wherein the touch control glass layer is positioned between the liquid crystal screen glass layer and the cover glass layer, and a capacitive touch function circuit layer and a shielding film layer are formed on the surface and bottom glass layers of the touch control glass.
Preferably, one surface of the touch control glass layer is bonded with the liquid crystal screen glass layer through optical cement, and the other surface of the touch control glass layer is bonded with the cover plate glass layer through optical cement.
Further preferably, the optical adhesive used for bonding between the touch glass and the cover plate glass is LOCA, and the optical adhesive used for bonding between the touch glass and the liquid crystal screen glass layer is SCA or OCA.
Still further preferably, the capacitive touch functional circuit layer and the shielding film layer are respectively formed on two sides of the touch glass by successively adopting a coating technology and an etching and developing technology, wherein the shielding film layer is a transparent conductive film layer, and the capacitive touch functional circuit layer sequentially comprises a sensor functional circuit layer, a conductive pattern, a protective layer and an XY functional circuit from bottom to top.
Still further preferably, the coating technology is magnetron sputtering or vacuum evaporation.
Still further preferably, on the touch glass, an ITO sheet resistance of the shielding film layer is in a range of 3 to 12 ohms, and an ITO sheet resistance of the sensor functional circuit layer of the capacitive touch functional circuit is in a range of 75 to 200 ohms.
Compared with the prior art, the invention has the following beneficial technical effects due to the adoption of the technical scheme:
1. compared with the prior art, the scheme provided by the invention has the advantages that the shielding layer and the capacitive touch function circuit layer are directly manufactured on the two surfaces of the touch control glass without additionally arranging the conductive glass or the conductive film to realize electromagnetic compatibility, so that the shielding effect under special display is realized on the premise of not increasing the thickness of the display equipment and not improving the manufacturing cost of the display equipment.
2. A protective layer is arranged between the ITO conductive pattern and the capacitive touch function circuit, so that the insulating effect is achieved, and the operation stability of the circuit is protected.
Drawings
FIG. 1 is a schematic diagram illustrating the structure of a prior art capacitive touch shield assembly;
fig. 2 is an enlarged view illustrating a layered structure of a capacitive touch display device with a shielding function according to a preferred embodiment of the present invention.
Detailed Description
An embodiment of a capacitive touch display device with a shield function according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
It should be noted that, in the embodiments of the present invention, the expressions "first" and "second" are used to distinguish two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and the descriptions thereof in the following embodiments are omitted.
In order to realize shielding on a cover glass of a touch screen in the prior art, generally, ITO conductive glass or a conductive film is used as a shielding layer on the back surface of the capacitive touch screen while a capacitive touch functional circuit (i.e., a conductive circuit in the X and Y directions) is manufactured. FIG. 1 is a schematic diagram illustrating the structure of a prior art capacitive touch screen assembly. Referring to fig. 1, in the prior art, a capacitive touch screen display device includes a liquid crystal screen 10a, a cover glass 20a, and a touch glass 30a located between the liquid crystal screen 10a and the cover glass 20 a. In order to achieve the shielding effect, the shielding glass 40a is added between the liquid crystal screen 10a and the touch glass 30a, and then the liquid crystal screen 10a, the shielding glass 40a, the touch glass 30a and the cover glass 20a are sequentially bonded through the optical adhesive 50a, so as to form the capacitive touch shielding component in the prior art.
The preferred embodiment of the present invention is directed to the technical problems of the prior art that the capacitive touch screen assembly is thick and heavy due to the addition of the shielding glass, and the product cost is high. The shielding glass is omitted, and the shielding layer and the circuit layer are directly manufactured on two sides of the touch control glass respectively.
Fig. 2 is an enlarged view illustrating a layered structure of a capacitive touch display device with a shielding function according to a preferred embodiment of the present invention. As shown in fig. 2, the capacitive touch display device with shielding function in the preferred embodiment of the present invention also includes a liquid crystal panel glass layer 10, a touch glass layer 20 and a cover glass layer 30, wherein the touch glass layer 20 is located between the liquid crystal panel glass layer 10 and the cover glass layer 30, and the layers are adhered and fixed by an optical adhesive 40. As mentioned above, the capacitive touch functional circuit and the shielding film layer are respectively formed on the two side surfaces of the touch glass layer 20.
Specifically, the two side surfaces of the touch glass layer 20 are defined as a first surface adhered to the lcd glass layer 10 and a second surface adhered to the cover glass layer 30, respectively, for convenience of description. Firstly, a film coating technique such as magnetron sputtering or vacuum evaporation is adopted on the first surface of the touch glass layer 20 to manufacture the shielding layer 21, the shielding layer 21 is a transparent conductive film layer, and the ITO sheet resistance of the shielding layer 21 should be set within a range of 3 ohms to 12 ohms, for example, in the preferred embodiment of the present invention, the ITO sheet resistance of the shielding layer 21 is set to 10 ohms.
Next, a capacitive touch function circuit is manufactured. In the preferred embodiment of the present invention, the capacitive touch functional circuit layer 22 includes a sensor functional circuit layer, a conductive pattern, a passivation layer and an XY functional circuit layer from bottom to top. First, a sensor functional circuit layer is also formed on the second surface of the touch glass layer 20 by using a film coating technique such as magnetron sputtering or vacuum evaporation, the sensor functional circuit layer is also a transparent conductive film layer, in the preferred embodiment, the ITO sheet resistance of the sensor functional circuit layer is set to 100 ohms, and the ITO sheet resistance of the sensor functional circuit layer can be adjusted within a range of 75 ohms to 200 ohms according to the size of the display device.
Then, an ITO conductive pattern is manufactured on the sensor functional circuit layer by adopting an etching and developing technology, a protective layer with an insulating function is manufactured on the manufactured ITO conductive pattern which meets the requirement, and finally the coating, etching, developing and protective layer manufacturing technologies are repeated on the protective layer to manufacture functional circuits in the X direction and the Y direction. And finally, connecting the Flexible Printed Circuit (FPC) with the glass circuit by a hot pressing technology, thereby leading out the signal.
It should be noted that in the preferred embodiment of the present invention, the optical adhesive used for bonding between the touch glass layer 20 and the cover glass layer 30 is LOCA, and the optical adhesive used for bonding between the touch glass layer 20 and the liquid crystal display glass layer 10 is SCA or OCA.
Compared with the prior art, the invention has the following beneficial technical effects due to the adoption of the technical scheme:
1. compared with the prior art, the scheme provided by the invention has the advantages that the shielding layer and the capacitive touch function circuit layer are directly manufactured on the two surfaces of the touch control glass without additionally arranging the conductive glass or the conductive film to realize the electromagnetic compatibility, so that the shielding effect under special display is realized on the premise of not increasing the thickness of the display equipment and not improving the manufacturing cost of the display equipment, the technical bottleneck that a capacitive touch screen is adopted to replace a resistive touch screen in the field of special display is solved.
2. A protective layer is arranged between the ITO conductive pattern and the capacitive touch function circuit, so that the insulating effect is achieved, and the operation stability of the circuit is protected.
The present invention has been described in detail, and the embodiments are only used for understanding the method and the core idea of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A capacitive touch display device with a shielding function is characterized in that the capacitive touch display device is a multilayer structure formed by laminating a liquid crystal screen glass layer, a touch control glass layer and a cover glass layer, the touch control glass layer is positioned between the liquid crystal screen glass layer and the cover glass layer, wherein,
the touch control glass comprises a touch control glass body, a sensor functional circuit layer, a conductive pattern, a protective layer and an XY functional circuit layer, wherein the touch control glass body is provided with a bottom surface glass layer and a bottom surface glass layer, the touch control glass body is provided with a plurality of transparent conductive films, the bottom surface glass layer is provided with a plurality of transparent conductive films, the sensor functional circuit layer and the shielding films are formed on the two surfaces of the touch control glass body sequentially by adopting a film coating technology and an etching development technology, the transparent conductive films are arranged on the transparent conductive films, and the touch control glass body sequentially comprises the sensor functional circuit layer, the conductive pattern, the protective layer and the XY functional circuit layer from bottom to top.
2. The capacitive touch display device with the shielding function according to claim 1, wherein one surface of the touch glass layer is bonded to the liquid crystal display glass layer through optical cement, and the other surface of the touch glass layer is bonded to the cover glass layer through optical cement.
3. The capacitive touch display device with the shielding function according to claim 2, wherein an optical adhesive used for bonding between the touch glass and the cover glass is LOCA, and an optical adhesive used for bonding between the touch glass and the liquid crystal screen glass layer is SCA or OCA.
4. The capacitive touch display device with shielding function of claim 3, wherein the coating technology is magnetron sputtering or vacuum evaporation.
5. The capacitive touch display device with shielding function according to claim 3 or 4, wherein the ITO sheet resistance of the shielding film layer on the touch glass is in a range of 3 ohms to 12 ohms, and the ITO sheet resistance of the sensor functional circuit layer on the capacitive touch functional circuit layer is in a range of 75 ohms to 200 ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110074864.8A CN112748825B (en) | 2021-01-20 | 2021-01-20 | Capacitive touch display device with shielding function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110074864.8A CN112748825B (en) | 2021-01-20 | 2021-01-20 | Capacitive touch display device with shielding function |
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| Publication Number | Publication Date |
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| CN112748825A CN112748825A (en) | 2021-05-04 |
| CN112748825B true CN112748825B (en) | 2022-09-20 |
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| CN202110074864.8A Active CN112748825B (en) | 2021-01-20 | 2021-01-20 | Capacitive touch display device with shielding function |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115357140A (en) * | 2022-08-22 | 2022-11-18 | 福耀玻璃工业集团股份有限公司 | Touch control laminated glass and control device, system and method thereof and control panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204406376U (en) * | 2015-01-15 | 2015-06-17 | 苏伟 | A kind of touch control capacitance screen with shielding, anti-static function |
| CN206696837U (en) * | 2017-05-19 | 2017-12-01 | 信利光电股份有限公司 | A kind of touch-screen |
| CN210691285U (en) * | 2019-12-24 | 2020-06-05 | 深圳市奇彩液晶显示技术有限公司 | Touch screen supporting gloves |
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- 2021-01-20 CN CN202110074864.8A patent/CN112748825B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204406376U (en) * | 2015-01-15 | 2015-06-17 | 苏伟 | A kind of touch control capacitance screen with shielding, anti-static function |
| CN206696837U (en) * | 2017-05-19 | 2017-12-01 | 信利光电股份有限公司 | A kind of touch-screen |
| CN210691285U (en) * | 2019-12-24 | 2020-06-05 | 深圳市奇彩液晶显示技术有限公司 | Touch screen supporting gloves |
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| CN112748825A (en) | 2021-05-04 |
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