CN102375603A - Display device with touch tablet - Google Patents

Display device with touch tablet Download PDF

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Publication number
CN102375603A
CN102375603A CN2011102359000A CN201110235900A CN102375603A CN 102375603 A CN102375603 A CN 102375603A CN 2011102359000 A CN2011102359000 A CN 2011102359000A CN 201110235900 A CN201110235900 A CN 201110235900A CN 102375603 A CN102375603 A CN 102375603A
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China
Prior art keywords
touch
noise
display device
touch pad
layer
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Granted
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CN2011102359000A
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Chinese (zh)
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CN102375603B (en
Inventor
金钟赫
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LG Display Co Ltd
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LG Display Co Ltd
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Publication of CN102375603A publication Critical patent/CN102375603A/en
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Publication of CN102375603B publication Critical patent/CN102375603B/en
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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
    • 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
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

A display device with a touch tablet is provided to effectively intercept noises generated from a display plate and prevent the touch tablet from losing efficacy. The display device with the touch tablet comprises the display plate; the touch tablet which is adhered to the display plate through an adhesive layer; a noise intercepting layer which is arranged on the whole rear surface of the touch tablet and used for preventing electric noises from being led into the touch tablet; a metal ring pattern which is arranged on the noise intercepting layer around the edge of the noise intercepting layer, and the resistance of the metal ring pattern is lower than the resistance of the noise intercepting layer; and a grounding terminal which is electrically connected with the noise intercepting layer and the metal ring pattern.

Description

Display device with touch pad
Technical field
The present invention relates to a kind of display device with touch pad, more particularly, relate to a kind of display device with such touch pad, this touch pad effectively interception lost efficacy to prevent said touch pad from the noise that display board generates.
Background technology
The application requires the right of priority of the korean patent application 10-2010-0080547 of submission on August 19th, 2010, and is by reference that it is incorporated at this, the same as set forth at this comprehensively.
Recently, can come the touch-screen of input information to be widely used as the information input unit of computer system through touch to the screen of various display device.Touch with finger or input pen through the user simply, touch-screen moves or selects display message, thus of all ages or sex anyone be easy to use touch-screen.
Touch that touchscreen senses produces on the screen of display device or touch location, and output touch information, and this touch information of computer system analysis, fill order then.As display device, use panel display apparatus usually such as liquid crystal indicator, plasma display panel or organic LED display device.
Touch screen technology is divided into resistor-type, capacitor type, infrared type, ultrasonic-type or electromagnetic type according to method for sensing.In the middle of these types, have advantage with regard to manufacturing cost resistor-type and capacitor type, thereby be widely used.
The resistor-type touch-screen through sensing because the change in voltage that the contact between the resistive film up and down (nesa coating) that causes of touch pressure produces is come recognizing touch operation.Yet the shortcoming of resistor-type touch-screen is that touch-screen or display device are damaged owing to touch pressure easily, and this touch-screen is owing to the scattering in the air layer between the resistive film has low-transmittance.
Overcome the capacitive touch screen of these shortcomings of resistor-type touch-screen, little charge moved the capacitance variations that is produced to the touch point and comes recognizing touch operation when the conductor through sensing such as human body or input pen touched touch-screen.Capacitive touch screen has high transmission rate and fabulous touch-sensing ability, and can carry out multiple point touching, thereby caused extensive concern owing to using tempered glass to have high-durability.
Usually, touch-screen is manufactured into the panel on the top that is attached to display device, thereby can touch input.Yet the display device shortcoming with touch pad is that the touch sensor in the touch pad maybe be because the electromagnetic interference (EMI) that the noise (that is static) that display device produces cause and losing efficacy.
Summary of the invention
Therefore, the present invention relates to a kind of display device with touch pad.
An object of the present invention is to provide the display device with touch pad of noise that a kind of effective interception produces from display board to prevent that touch pad lost efficacy.
In order to realize this purpose and other advantage, and according to the object of the invention, like institute's practical implementation and broadly described here, a kind of display device with touch pad comprises: display board; Touch pad, this touch pad is attached to said display board through adhesion layer; Noise intercept layer, this noise intercept layer are introduced in the said touch pad from the electrical noise of said display board preventing on the surface, whole back of said touch pad; Becket pattern, this becket pattern are on said noise intercept layer, and with the edge around said noise intercept layer, and the resistance of this becket pattern is lower than the resistance of said noise intercept layer; And ground terminal, this ground terminal is electrically connected to said noise intercept layer and said becket pattern.
Said touch pad can comprise: outside surface is provided with the infrabasal plate of said noise intercept layer, said becket pattern and said ground terminal; Capacitive touch sensor, it is formed on the inside surface of said infrabasal plate; And the lid substrate, it is formed on the said touch sensor.
Said display device can also comprise: be used for said touch sensor is electrically connected to touch controller to drive the circuit film of said touch sensor; And the circuit film extension, its from the inside surface of said infrabasal plate along said lower surface edgewise bend and be connected to the ground terminal that the back surface of said infrabasal plate forms.
Said circuit film extension can be configured to make the width of the first that is connected to said ground terminal of said circuit film extension greater than the width of the second portion of the edgewise bend of the said infrabasal plate in edge of said circuit film extension.
Said becket pattern is formed in the identical metal level with said ground terminal.
Should be appreciated that, all be exemplary and indicative to above general introduction of the present invention and following detailed description, and be intended to further explanation is provided the present invention for required protection.
Description of drawings
Accompanying drawing is included among the application providing further understanding of the present invention, and is attached among the application and constitutes the application's a part, these accompanying drawing illustrations (a plurality of) of the present invention embodiments, and be used to explain principle of the present invention with instructions.In the accompanying drawing:
Fig. 1 is the schematic longitdinal cross-section diagram according to the display device with touch pad of an embodiment of the invention;
Fig. 2 A and 2B have been illustrations according to the figure that has or do not exist the noise discharge path of becket pattern;
Fig. 3 is the planimetric map of electrode structure of the part of the capacitive touch sensor shown in Fig. 1; And
Fig. 4 has been an illustration at the back lip-deep FPC of the touch pad shown in Fig. 3 and the longitdinal cross-section diagram of the syndeton between the ground terminal.
Embodiment
After this, with reference to accompanying drawing, describe the display device that has touch pad according to of the present invention in detail.
Fig. 1 is the schematic longitdinal cross-section diagram according to the display device with touch pad of an embodiment of the invention.
Display device shown in Fig. 1 comprises display board 40 and is attached to the touch pad 10 on the surface of this display board 40 through adhesion layer 30.
As display board 40, use panel display apparatus usually such as liquid crystal indicator, plasma display panel or organic LED display device.For example; If with liquid crystal indicator as display board 40, the liquid crystal indicator polarization plates of outside surface that comprises the filter substrate that is formed with color filter array, the thin film transistor base plate that is formed with thin film transistor (TFT) array, the liquid crystal layer that between filter substrate and thin film transistor (TFT) array, forms and be attached to outside surface and the thin film transistor base plate of filter substrate respectively then.Liquid crystal indicator utilizes horizontal component of electric field or vertical electric field to drive liquid crystal layer according to picture signal, thus display image.
Transparent adhesion layer 30 is coated on the whole surface of display board 40, and touch pad 10 is attached on the display board 40 through this adhesion layer 30.Adhesion layer 30 is formed by the optics elastic resin, for example, can use the ultraphotic resin (SVR:Super View Resin) as propenyl UV cured resin.SVR has improved visibility and resistance to impact.
Touch pad 10 comprises the lid substrate 12 on touch sensor 14 that forms on the infrabasal plate 16 and the upper surface that is positioned at this touch sensor 14.Infrabasal plate 16 is formed by glass or transparent polymer with lid substrate 12.In addition, lid substrate 12 can be formed by the tempered glass with high-durability.Little charge moved the capacitive touch sensor 14 that the capacitance variations that is produced is come recognizing touch operation to the touch point when touch pad 10 used through this touch pad 10 of conductor touch of sensing such as human body or input pen.Touch sensor 14 is electrically connected to the touch controller that is installed on this circuit film through circuit film (for example, flexible printed circuit (FPC)).Whether touch controller provides drive signal and receives sensing signal from touch sensor 14 to touch sensor 14, judge thus to exist to touch and touch location.
Between touch pad 10 and display board 40, that is, on the surface, whole back of touch pad 10, be formed for preventing to be introduced into the noise intercept layer 18 the touch pad 10 from the noise of display board 40 radiation.Through utilizing deposition process (for example, sputter or chemical vapor deposition (CVD)) on the back surface of touch pad 10, promptly on the outside surface of infrabasal plate 16, the deposit transparent conductive layer forms noise intercept layer 18.Transparency conducting layer is by (transparent conductive material of ITZO or antimony tin (ATO) forms such as tin indium oxide (ITO), indium zinc oxide (IZO), tin indium oxide zinc.Noise intercept layer 18 is electrically connected to ground terminal 22, for example shown in 2A and the 2B.Ground terminal 22 is connected to the ground power supply through FPC.Therefore, noise intercept layer 18 discharges the noise that is incorporated into noise intercept layer 18 from display board 40 radiation then to ground terminal 22, that is, static prevents to be incorporated into touch pad 10 from the noise of display board 40 radiation thus.Noise intercept layer 18 is formed on the surface, whole back of infrabasal plate 16, thereby can tackle the touch sensitive areas that is incorporated into touch pad 10 from the viewing area and the peripheral drive circuit zone of display board 40 and all electrical noises of perimeter.
Especially, shown in Fig. 2 B, the resistance that has formed resistance ratio noise intercept layer 18 at the edge of noise intercept layer 18 is low so that shorten the becket image 20 of the discharge delay time of noise.Becket image 20 is electrically connected to ground terminal 22 with noise intercept layer 18, thereby will promptly be discharged into ground terminal 22 from the noise that noise intercept layer 18 discharges.Becket pattern 20 is formed on the edge of noise intercept layer 18 through sputter or printing.Becket pattern 20 forms by having low-resistance relatively metal, for example, and molybdenum (Mo), copper (Cu), silver (Ag), chromium (Cr), aluminium (Al), aluminium neodymium alloy (AlNd) and molybdenum titanium (alloy MoTi).In addition, becket pattern 20 is formed in the identical metal level of the ground terminal that forms with noise intercept layer 18 belows 22, and is electrically connected to ground terminal 22.For example, becket pattern 20 utilizes the Ag slurry through being printed on the edge of noise intercept layer 18, forms the shape of sealing rectangular band.In addition, ground terminal 22 is electrically connected to becket pattern 20 and the same with becket pattern 20, utilizes the Ag slurry to form through being printed on noise intercept layer 18 belows.
Transparency conducting layer as noise intercept layer 18 has high relatively resistance.Thus, if there is not becket pattern 20, shown in Fig. 2 A; The zone near ground terminal 22 of noise intercept layer 18 then, that is, bottom A discharges noise rapidly; But in the zone away from ground terminal 22 of noise intercept layer 18; Be among the B of top, be used for being postponed owing to high resistance, thereby maybe noise be incorporated in the touch pad 10 through the time of ground terminal 22 release noises.In this case, some zones of touch pad 10, that is, top B is normal sensing signal with noise identification, perhaps do not sense touch owing to noise, thereby touch pad 10 possibly lose efficacy.
On the other hand; If the additional formation becket pattern 20 lower at the edge of noise intercept layer 18 than transparency conducting layer resistance, shown in Fig. 2 B, even the zone away from ground terminal 22 of noise intercept layer 18; Be top, also can discharge noise rapidly through this becket pattern 20.That is, regardless of with the distance of ground terminal 22, noise intercept layer 18 discharges noises through becket pattern 20 rapidly to ground terminal 22.Thus, can prevent effectively to be introduced in some zones of touch pad 10 from the noise of display board 40 the noise hangover owing to noise intercept layer 18.As a result, can prevent owing to the inefficacy that will be incorporated into the touch pad 10 that touch pad 10 causes from the noise of display board 40.
Fig. 3 is the planimetric map of the electrode structure in the part of the capacitive touch sensor 14 shown in Fig. 1.
Capacitive touch sensor 14 shown in Fig. 3 comprises at touch sensitive areas TSA: many first sensing electrode lines 142 wherein, connect a plurality of first sensing electrodes 141 through first connection electrode, 143 along continuous straight runs (that is, along X-direction); And many second sensing electrode lines 146, wherein, through second connection electrode 147 vertically (that is, along Y direction) connect a plurality of second sensing electrodes 145.Many first vertically (along Y direction) arrangements of sensing electrode line 142, and many second sensing electrode line 146 along continuous straight runs (along X-direction) are arranged.First sensing electrode 141 and second sensing electrode 145 form with rhombus, but also can form with various other shapes.Between first connection electrode 143 and second connection electrode 147, accompany under the condition of insulation course (not shown), first connection electrode 143 and second connection electrode 147 are intersected with each other.First sensing electrode 141, second sensing electrode 145 are formed by identical transparency conducting layer with second connection electrode 147, and first connection electrode 143 is formed by metal level, and metal level forms and makes insulation course be clipped between transparency conducting layer and the metal level.First connection electrode 143 is electrically connected to first sensing electrode 141 through the contact hole that runs through this insulation course.Perhaps; First sensing electrode 141 can be formed by identical transparency conducting layer with first connection electrode 143 with second sensing electrode 145; And second connection electrode 147 can be formed by metal level, and this metal level forms and makes second connection electrode 147 be electrically connected to second sensing electrode 145 through contact hole.First sensing electrode 141 and second sensing electrode 145 form capacitor with touching the conduction touch body that covers substrate 12, and change electric capacity, thus the output sensing signal.
In addition; In the perimeter OA of touch sensitive areas TSA, capacitive touch sensor 14 also comprises: be electrically connected to many first lead-in wires 148 of the first sensing electrode line 142 that is arranged in touch sensitive areas TSA respectively, be electrically connected to many second lead-in wires 160 of the second sensing electrode line 146 that is arranged in touch sensitive areas TSA and the pad 170 that is electrically connected to first lead-in wire, 148 and second lead-in wire 160 respectively respectively.First lead-in wire 148 is connected respectively to the left end and the right-hand member of the first sensing electrode line 142, and is connected to the respective pad 170 of the welding disking area of the bottom that is arranged in perimeter OA.Second lead-in wire 160 is connected respectively to the lower end of the second sensing electrode line 146, and is connected to the respective pad 170 that is arranged in welding disking area.First lead-in wire, 148, second lead-in wire 160 and pad 170 be formed on touch sensitive areas TSA in first connection electrode 143 and second connection electrode 147 one of in the two in the identical metal level.
For example; On infrabasal plate 16, form first connection electrode 143 be included among the touch sensitive areas TSA and second connection electrode 147 in the two first among a side and the externally regional OA go between 148, second go between 160 and the metal pattern of pad 170 after; On this metal pattern, form the insulation course be provided with contact hole, and on this insulation course, form the transparent conductive patterns that comprises first connection electrode 143 and second connection electrode 147 the opposing party, first sensing electrode 141 and second sensing electrode 145 in the two.
The a plurality of pads 170 that form in the welding disking area are electrically connected to FPC 180, thereby are electrically connected to the touch controller (not shown) of installing on the FPC 180.Touch controller not only drives the first sensing electrode line 142 and the second sensing electrode line 146 of touch sensor 14; And through receiving from the sensing signal of the first sensing electrode line 142 and 146 outputs of the second sensing electrode line and according to the unit interval these sensing signals are carried out integration and come sensing whether to have touch, and come the sensing touch position according to the first sensing electrode line 142 of exporting these sensing signals and the X axle and the Y shaft position of the second sensing electrode line 146.
The extension 180A that extends from side of FPC 180 is electrically connected to the ground terminal 22 that forms on the back surface of touch pad 10, shown in Fig. 2 B.That is, the extension 180A of FPC 180 is along the edgewise bend of the infrabasal plate 16 of touch pad 10, and is as shown in Figure 4, and is electrically connected to the ground terminal 22 that on the back surface of infrabasal plate 16, forms.The extension 180A of FPC 180 comprises along the part edgewise bend of infrabasal plate 16, that width is little and is connected to part ground terminal 22, that width is big.FPC 180 discharges the noise that discharges from noise intercept layer 18 through becket pattern 20 and ground terminal 22 to the ground power supply, thereby eliminates noise.
As stated; In the display device with touch pad according to the present invention; The noise intercept layer 18 that is formed by transparency conducting layer is formed on the surface, whole back of the touch pad 10 that is attached to display board 40; And becket pattern 20 is formed on the edge of noise intercept layer 18, thereby effectively interception is from the noise of display board 40 introducings, and and the range-independence between noise intercept layer 18 and the ground terminal 22.Thus; Make the noise minimum that is incorporated into touch pad 10 from display board 40; Thereby prevent because the touch pad 10 that noise causes lost efficacy; And make the noise minimum that is incorporated into touch controller through touch sensor 10, drive scope, thereby improve the sensing performance of touch controller thereby enlarge sensing signal.
Be apparent that according to foregoing description; In the display device with touch pad according to the present invention; The edge of the noise intercept layer that between touch pad and display board, by transparency conducting layer, forms forms has low-resistance becket pattern; Thereby discharge noise rapidly through ground terminal from display board, and and the range-independence between noise intercept layer and the ground terminal.
Therefore, effectively tackled noise, thereby prevented that touch sensor lost efficacy, and reduced to introduce the noise of touch controller, driven scope thereby enlarged sensing signal, thereby improved the sensing signal discrimination from display board.
To those skilled in the art, obviously, can under the situation that does not break away from the spirit or scope of the present invention, make various modification embodiments and modification to the present invention.Therefore, the present invention is intended to contain these modification embodiment and modification that fall in appended claims and the equivalent scope thereof of the present invention.

Claims (6)

1. display device, this display device comprises:
Display board;
Touch pad, this touch pad is attached to said display board through adhesion layer;
Noise intercept layer, this noise intercept layer are introduced in the said touch pad from the electrical noise of said display board preventing on the surface, whole back of said touch pad;
Becket pattern, this becket pattern are on said noise intercept layer, and with the edge around said noise intercept layer, and the resistance of this becket pattern is lower than the resistance of said noise intercept layer; And
Ground terminal, this ground terminal are electrically connected to said noise intercept layer and said becket pattern.
2. display device according to claim 1, wherein, said touch pad comprises:
Infrabasal plate, its outside surface are the surfaces, said back of said touch pad;
Capacitive touch sensor, it is formed on the inside surface of said infrabasal plate; And
The lid substrate, it is formed on the said touch sensor.
3. display device according to claim 2, this display device also comprises:
Circuit film, this circuit film are used for said touch sensor is electrically connected to touch controller, to drive said touch sensor; And
Circuit film extension, this circuit film extension from the said inside surface of said infrabasal plate along said infrabasal plate edgewise bend and be connected to the ground terminal that the outside surface at said infrabasal plate forms.
4. display device according to claim 3; Wherein, Said circuit film extension is configured to, and makes the width of the first that is connected to said ground terminal of said circuit film extension greater than the width of the second portion of the edgewise bend of the said infrabasal plate in edge of said circuit film extension.
5. display device according to claim 1, wherein, said becket pattern is formed in the identical metal level with said ground terminal.
6. display device according to claim 1, wherein, said noise intercept layer is formed by transparency conducting layer.
CN201110235900.0A 2010-08-19 2011-08-17 There is the display device of touch pad Active CN102375603B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20100080547 2010-08-19
KR10-2010-0080547 2010-08-19

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CN102375603B CN102375603B (en) 2016-03-02

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CN104254825A (en) * 2012-03-23 2014-12-31 Fogale纳米技术公司 Capacitive sensing device incorporating a metal strip on a transparent guard
CN103576971B (en) * 2012-07-24 2016-08-17 宏达国际电子股份有限公司 Electronic installation, touch cover and preparation method thereof
CN103576971A (en) * 2012-07-24 2014-02-12 宏达国际电子股份有限公司 Electronic apparatus, touch cover and fabricating method thereof
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