GB2456312A - Transparent Capacitive Touch Panel - Google Patents
Transparent Capacitive Touch Panel Download PDFInfo
- Publication number
- GB2456312A GB2456312A GB0800369A GB0800369A GB2456312A GB 2456312 A GB2456312 A GB 2456312A GB 0800369 A GB0800369 A GB 0800369A GB 0800369 A GB0800369 A GB 0800369A GB 2456312 A GB2456312 A GB 2456312A
- Authority
- GB
- United Kingdom
- Prior art keywords
- axis
- layer
- sensing layer
- axis sensing
- traces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
-
- 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
- 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
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
-
- 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
- G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
Abstract
A transparent capacitive touch panel is described comprising a top plate 1, a first-axis sensing layer 2, a second-axis sensing layer 3, an insulation layer 4 between the two said sensing layers, and a substrate 5. All the layers are glued together to form a transparent panel. The first-axis and second-axis sensing layers are provided with a plurality of wiring terminals which are connected to silver conductive circuits positioned at edges of the top plate, and further to the output wire bank through which signals from sensing layers are sent to subsequent signal processing circuits. Wherein, the first-axis and second-axis sensing layers are manufactured of materials of good conductivity, such as indium tin oxide (ITO) using etching process. The touch sensitive device may further comprise an electromagnetic shielding layer 7 underneath the foresaid substrate 5 to prevent electromagnetic interference on the device. The transparent electromagnetic shielding layer may be connected to the first axis and second axis sensing layers via conductive materials filled in holes 52 penetrating through the substrate layer.
Description
TOUCH SENSITIVE DEVICE
FIELD OF THE INVENTION
The present invention relates to a touch sensitive device, particularly, to a touch sensitive device which is suitable to be used on the display screen of small electronic products and in which the input positions are detected through capacitive sensing.
BACKGROUND OF THE INVENTION
In recent years, the rapid advance of production and manufacture technologies of touch sensitive devices has improved both the performance of products and the quality of components thereof, led to a considerable cut in price, and promoted the wide application of various touch sensitive devices in a great variety of electronic products as well, for instances, they are used as the touch mouse pads of personal computers, as the capacitive touch panels of virtual touch keyboards, or as the resistive touch panels on the screen of small-sized electronic products including personal digital assistants(PDAs), electronic dictionaries, mobile telephones, MP3 digital players, global position systems(GPS).
A most common capacitive touch panel usually contains an X-axis sensing layer and a Y-axis sensing layer which are installed in the panel isolated, grounded separately and connected to a control circuit. In use, whenever the panel is touched by a finger or a conductor, an effect occurs on the quiescent capacitance, and the touching position of the finger or conductor is determined according to the change in capacitance. Since the input to the capacitive touch panel can be done by finger, so it is every easy to use. Such input operations require no pressure against the panel, so no damages can be caused on the panel by repeated stress and resultant deformation.
Furthermore, such touch panel is characterized by simple structure, less components, so a high quality of products can be achieved easily and it is possible to cut down the production cost through mass production. However, since the sensing layers of such capacitive touch panel are made of copper foils, no mater how thin copper foils are processed,they never become transparent due to the limations of material propertities.
Therefore, the resulted touch panels can never be used for the purpose of interactive inputting at the upper layer of a display screen, instead mostly used in applications such as touch mouse pads and virtual console buttons.
A conmion resistive touch panel consists of two sheets of electrically conductive films which are installed in opposite way and spaced apart from each other with a gap. Generally, the upper conductive film is installed upon the surface of a flexible transparent film and the lower one upon the surface of a hard transparent glass substrate, and several protruding-spot-shaped spacers are provided between them to produce the foresaid gap. These two conductive films are tightly sealed by the adhesive glue spread along the peripherals of the opposite surfaces. On the top and bottom or at the left and right sides of these conductive films are silver conductive circuits through which the signals generated by touch input operations detected by these resistive films are transferred to the signal processing circuit. Since the resistive touch panel, including the upper and lower conductive films, is transparent, so it is suitable to be installed upon the display screen of electronic products to allow users to perform various input operations through slightly touch pressing the required positions on the display screen following the instructions on screen picture. The input of the resistive touch panel can be done through precisely touch pressing the required positions using any pointed object at hand such as a pencil so that delicate input operations are possible. As stated above, the input operations require pressing against the panel, thus after a long time, the panel will deform or even is destroyed by the repeated pressing operations. So the life span of the resistive touch panel is finite.
Besides, the input by human finger or other input tools with a larger tip is apt to result in inaccurate results, so there are also many restrictions on input tools.
Therefore,a touch sensitive device easy to operate, with a long lifetime and suitable to be installed upon display screens of electronic products is what we are expecting for.
SUMMARY OF THE INVENTION
The invention provides a touch sensitive device which is suitable to be used on display screens of small electronic products, and in which the input positions can be detected through capacitive sensing.
The touch-sensing device provided in the present invention consists of a top plate, a first-axis sensing layer, a second-axis sensing layer, an insulation layer between two sensing layers, and a substrate. All layers are bonded together to form a transparent panel. The first- axis sensing layer is composed of first-axis traces, and the second-axis sensing layer of second-axis traces. First-axis sensing traces and second-axis sensing traces are arranged in alternating way to form a matrix. The first-axis and second-axis sensing layers are provided with wiring terminals which are connected to silver conductive circuits positioned at edges of the top plate, and further to the output wire bank through which signals from sensing layers are sent to subsequent signal processing circuits.
The first-axis and second-axis sensing layers are preferably manufactured of materials of good conductivity, such as indium tin oxide (ITO) using etching process.
The invention further includes an electromagnetic shielding layer underneath the foresaid substrate. This layer was connected to the first-axis and second-axis sensing layers, form a grounding layer to achieve the purpose to prevent and intercept electromagnetic interference signals and to further allow the capacitive touch panel to operate normally.
It is intended that the invention not be limited the particular embodiments as stated below, apparently, it will be understood by those skilled in the art that many modifications and improvements can be made upon a reading of the foregoing description. The invention includes all modifications or improvements falling within the scope of the appended claims and without departing from the creative spirit of the author. The next section outlines examples to illustrate the innovation features of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is the side section view of the touch sensitive device provided by the present invention; Figure 2 is the schematic view showing the sensing layers 2 and 3 of the present invention; Figure 3 is the side section view of another embodiment of touch sensitive device of the present invention; and Figure 4 is the plan view of switching points of the substrate shown in Figure 3.
DETAILED DESCRIPTION OF THE INVENTION
As shown in Figure 1 and Figure 2, the first preferred embodiment of the present invention is a capacitive touch sensitive device consisting of a top plate 1, an X-axis sensing layer 2, a Y-axis sensing layer 3, an insulation layer 4 between X-axis and Y-axis sensing layers, a substrate 5 and a signal output wire bank 6. The top plate 1 is an insulating thin film made of high light-transmission materials such as polyester (PET) and cyclic olefin copolymers. X-axis and Y-axis sensing layers 2 and 3 may be formed of any transparent films of good electrical conductivity, such as indium tin oxide films. The insulation layer 4 between X-axis and Y-axis sensing layers can be made of translucent insulation materials such as mimeograph ink or polyester films of high light transmission. The substrate 5 may be any a hard transparent panel, such as a transparent glass plate, acrylic plate or polyester plate. The signal output wire bank 6 can be a flexible printed circuit(FPC) board, which has several circuits. All above mentioned layers can be glued together to form a transparent body. X-axis sensing layer 2 and Y-axis sensing layer 3 have been provided with a plurality of wiring terminals 21 and 31 that are connected to the signal output wire bank 6 via silver conductive circuits 61 at edge of top plate 1. Signals are transferred to the signal output wire bank 6 and then to subsequent signal processing circuits.
In the structure as described above, one equivalent capacitance is formed between X-axis sensing layer 2 and silver conductive circuits 61, and another between Y-axis sensing layer 3 and silver conductive circuits 61. Whenever a fmger or conductor touches or draws over the surface of touch panel, signal processing circuits can determine the touching position of the finger or conductor with is determined according to the change in capacitance. Therefore, the transparent touch panel in the present invention can be installed upon the display screen of electronic products to allow users to perform various input operations through slightly touching the required positions on the display screen following the instructions of screen picture.
As shown in Figure 3 and Figure 4, the second preferred embodiment of the present invention is a capacitive touch sensitive device which is transparent and can eliminate electromagnetic interference (EM!), comprising a top plate 1, an X-axis sensing layer 2, a Y-axis sensing layer 3, an insulation layer 4 between X-axis and Y-axis sensing layers, a substrate 5, a signal output wire bank 6, and an electromagnetic shielding layer 7. Wherein, The top plate I is an insulating thin film made of high light-transmission materials such as polyester (PET) film and cyclic olefin copolymers. X-axis and Y-axis sensing layers 2 and 3 can be made of transparent films of good electrical conductivity, such as indium tin oxide (ITO) films.
The insulation layer 4 between X-axis and Y-axis sensing layers can be made of translucent insulation materials such as mimeograph ink or polyester films of high light transmission. The substrate 5 is a hard transparent panel, such as transparent glass plate, acrylic plate and polyester plate. The signal output wire bank 6 can be a flexible printed circuit board (FPC), which has several circuits. The electromagnetic shielding layer 7 is underneath the substrate 5 and can be manufactured of transparent films of good electrical conductivity, for example, indium tin oxide (ITO) film. All above mentioned layers can be glued together to form a transparent body. The first-axis sensing layer 2 and second-axis sensing layer 3 have been provided with wiring terminals 21 and 31, and the surface of the substrate 5 facing the second-axis sensing layer 3 has been provided with switching points 51, each of which has a hole 52 penetrating through the substrate 5. The holes 52 are filled with conductive materials.
The wiring terminals 21 and 31 are connected to the switching point 51, putting the electromagnetic shielding layer, X-axis sensing layer 2 and Y-axis sensing layer 3 together in series for the purpose of grounding. Signals are transferred to the signal output wire bank 6 and then to subsequent signal processing circuits.
In the structure as described above, one equivalent capacitance is formed between X-axis sensing layer 2 and the electromagnetic shielding layer 7, and another one between Y-axis sensing layer 3 and the electromagnetic shielding layer 7.
Whenever a finger or conductor touches or slips over the surface of touch panel, signal processing circuits can determine the touching position of the finger or conductor with is determined according to the change in capacitance. Except for used as the grounding wire for X-axis sensing layer 2 and Y-axis sensing layer 3, the electromagnetic shielding layer 7 is also able to prevent and intercept electromagnetic interference signals to allow the entire capacitive touch panel to operate normally.
Claims (4)
- What is claimed is: 1. A touch sensitive device comprising: A top plate being made of insulating thin film of high light transmission; A first-axis sensing layer being a transparent film with good electrical conductivity and having plurality of first-axis traces; the same end of each said first-axis traces having wiring terminals; An insulation layer being made of a translucent thin film; A second-axis sensing layer being transparent film of good electrical conductivity and having second-axis traces, the same end of each said second-axis traces having wiring terminals; A substrate being made of translucent insulated plate; and A signal output wire bank having a plurality of conductive paths; Wherein, all said components are glued together in the order in which they are listed to form a transparent panel; Said first-axis traces and second- axis traces are arranged in alternating way and connected to silver conductive circuits provide on the edges of said top plate via the wiring terminals on said first-axis sensing layer and second-axis sensing layer and further to said signal output wire bank; In this way, sensing signals generated by said sensing layers can be transferred to consequent signal processing circuits.
- 2. The touch sensitive device according to claim 1, wherein, the transparent conductive films for said first-axis sensing layer and second-axis sensing layer are indium tin oxide films.
- 3. A touch sensitive device comprising: A top plate being made of insulating thin film of high light transmission; A first-axis sensing layer being a transparent film of good electrical conductivity first-axis traces, the same end of each said first-axis traces having wiring terminals; An insulation layer being made of a translucent thin film; A second-axis sensing layer being transparent film of good electrical conductivity and having second-axis traces, the same end of each said second-axis traces having wiring terminals; A substrate being made of a translucent insulating board and having switching points on the surface facing the second-axis sensing layer, each of switching points having one or more holes penetrating through the substrate board which are filled with conductive materials; An electromagnetic shielding layer being made of transparent film of good electrical conductivity, being installed underneath the said substrate, electrically being connected to the first-axis sensing layer and second-axis sensing layer via the said conductive materials, and forming, together with said first-axis sensing layer and second-axis sensing layer, a grounding layer; and A signal output wire bank having several conductors; Wherein, all said layers are glued together in the order that they are represented to form a transparent panel; The said first-axis traces and second-axis traces are arranged in alternating way; The electromagnetic shielding layer and the said sensing layers are connected together in series for grounding, and further to said signal output wire bank; In this way, sensing signals generated by said sensing layers can be transferred to consequent signal processing circuits.
- 4. The touch sensitive device according to claim 1, wherein, the transparent conductive films for the first-axis sensing layer, the second-axis sensing layer, and the electromagnetic shielding layer are all made of indium tin oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0800369A GB2456312A (en) | 2008-01-10 | 2008-01-10 | Transparent Capacitive Touch Panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0800369A GB2456312A (en) | 2008-01-10 | 2008-01-10 | Transparent Capacitive Touch Panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0800369D0 GB0800369D0 (en) | 2008-02-20 |
| GB2456312A true GB2456312A (en) | 2009-07-15 |
Family
ID=39144686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0800369A Withdrawn GB2456312A (en) | 2008-01-10 | 2008-01-10 | Transparent Capacitive Touch Panel |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2456312A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096221A (en) * | 2009-12-10 | 2011-06-15 | 乐金显示有限公司 | Touch panel-integrated liquid crystal display device |
| GB2458117B (en) * | 2008-03-04 | 2012-05-02 | Young Fast Optoelectronics Co | Capacitative touch panel |
| CN104142762A (en) * | 2013-05-06 | 2014-11-12 | 福建省辉锐材料科技有限公司 | Capacitive touch screen and preparation method thereof |
| EP2808727A4 (en) * | 2011-12-23 | 2015-08-05 | Boe Technology Group Co Ltd | Touch display and electronic device |
| CN105278713A (en) * | 2014-07-11 | 2016-01-27 | 宝宸（厦门）光学科技有限公司 | Touch device |
| US9250726B2 (en) | 2011-12-23 | 2016-02-02 | Boe Technology Group Co., Ltd. | Touch display and electronic apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4686332A (en) * | 1986-06-26 | 1987-08-11 | International Business Machines Corporation | Combined finger touch and stylus detection system for use on the viewing surface of a visual display device |
| GB2207003A (en) * | 1985-06-11 | 1989-01-18 | Shinetsu Polymer Co | Touch-operated see-through coordinate input unit |
| EP0400953A2 (en) * | 1989-05-31 | 1990-12-05 | Seiko Epson Corporation | Input device |
| US20010013855A1 (en) * | 1998-06-12 | 2001-08-16 | Jean-Philippe Fricker | Resistive and capacitive touchpad |
| WO2006068782A2 (en) * | 2004-12-22 | 2006-06-29 | 3M Innovative Properties Company | Touch sensors incorporating capacitively coupled electrodes |
-
2008
- 2008-01-10 GB GB0800369A patent/GB2456312A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2207003A (en) * | 1985-06-11 | 1989-01-18 | Shinetsu Polymer Co | Touch-operated see-through coordinate input unit |
| US4686332A (en) * | 1986-06-26 | 1987-08-11 | International Business Machines Corporation | Combined finger touch and stylus detection system for use on the viewing surface of a visual display device |
| EP0400953A2 (en) * | 1989-05-31 | 1990-12-05 | Seiko Epson Corporation | Input device |
| US20010013855A1 (en) * | 1998-06-12 | 2001-08-16 | Jean-Philippe Fricker | Resistive and capacitive touchpad |
| WO2006068782A2 (en) * | 2004-12-22 | 2006-06-29 | 3M Innovative Properties Company | Touch sensors incorporating capacitively coupled electrodes |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2458117B (en) * | 2008-03-04 | 2012-05-02 | Young Fast Optoelectronics Co | Capacitative touch panel |
| CN102096221A (en) * | 2009-12-10 | 2011-06-15 | 乐金显示有限公司 | Touch panel-integrated liquid crystal display device |
| CN102096221B (en) * | 2009-12-10 | 2016-07-06 | 乐金显示有限公司 | It is integrated with the liquid crystal display of touch panel |
| EP2808727A4 (en) * | 2011-12-23 | 2015-08-05 | Boe Technology Group Co Ltd | Touch display and electronic device |
| US9250726B2 (en) | 2011-12-23 | 2016-02-02 | Boe Technology Group Co., Ltd. | Touch display and electronic apparatus |
| CN104142762A (en) * | 2013-05-06 | 2014-11-12 | 福建省辉锐材料科技有限公司 | Capacitive touch screen and preparation method thereof |
| CN105278713A (en) * | 2014-07-11 | 2016-01-27 | 宝宸（厦门）光学科技有限公司 | Touch device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0800369D0 (en) | 2008-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |