CN1160661C - Contact screen for correcting electric field distribution nonlinearity using medium layer - Google Patents
Contact screen for correcting electric field distribution nonlinearity using medium layer Download PDFInfo
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- CN1160661C CN1160661C CNB031129935A CN03112993A CN1160661C CN 1160661 C CN1160661 C CN 1160661C CN B031129935 A CNB031129935 A CN B031129935A CN 03112993 A CN03112993 A CN 03112993A CN 1160661 C CN1160661 C CN 1160661C
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Abstract
The present invention relates to a touch screen which positions the coordinate of a touch point by detecting an electrical signal of the touch point on a conductive film with electric field distribution. The touch screen is characterized in that a medium insulation layer is fabricated below electrodes which are surrounded around the conductive film and are used for forming the electric field distribution; the medium insulation layer can correct the nonlinearity of the electric field distribution. The electric field nonlinearity correction technology has the advantages of simple design and easy fabrication, and is capable of effectively enlarging the linear touch positioning region of the touch screen.
Description
Technical field
The present invention relates to a kind of touch-screen, especially locate the touch-screen of touch point coordinate by the electric signal that detects touch point on the conducting film that one deck has Electric Field Distribution.
Background technology
Locate the touch-screen of touch point coordinate at present by the electric signal that detects touch point on the conducting film, need: a conduction working plate 2 of on transparent base 21, making (normally) rectangular conductive film 20, make electrode 22,23,24,25 around conducting film 20, adjacent electrode connects and makes contact conductor 32 at four jiao 31; Detect the pick-up unit of electric signal from conducting film 20 with an energy.Said apparatus can be one and make conducting film 10 and by the detecting electrode 13 and the 14 conduction mantles 1 that link to each other with controller 34 that go between at transparent mantle 11 lower surfaces, above-mentioned conduction mantle 1 edge passes through insulation sealing layer 40 involutions with conduction working plate 2, but at the center, conducting film 10 and 20 is by insulating every son 30 or liquid, air etc. are isolated from each other, only conduction mantle 1 just contacts with conduction working plate 2 when being subjected to touching, the controller 34 of touch-screen can detect touch, and locatees touch point coordinate (as shown in Figure 1) by the electric signal of detected touch point in the touch process; Said apparatus also can be devices such as other pen that can conduct electricity even hand.For having good linear relationship between the elements of a fix that make the touch point and the detected corresponding electric signal, require the equipotential line of the Electric Field Distribution that forms on the above-mentioned conducting film, in the touch point, be the parallel lines vertical with the detection coordinates direction.Because there is pressure drop (seeing United States Patent (USP) 4538168) in electrode itself, in testing process, be non-linear curve along the equipotential line of (between idiostatic two angle points) electrode edge.Can cause the position line near electrode edge straight line location thus is not straight line, but (as shown in Figure 2) to the non-linear position line 50 of center curvature, thereby have a strong impact on the touch locating accuracy.Contradiction for the non-linear and bearing accuracy that solves Electric Field Distribution has two kinds of ways: one. and by Control Software, rely on certain algorithm that the positional information of obtaining is carried out linearity correction, but can increase the cost of driving circuit and Control Software; Two. the electrode that forms the workplace Electric Field Distribution is carried out The Linearization Design.Existing electrode The Linearization Design relies on accurate resistor network or on-off element (seeing United States Patent (USP) 4661655,5438168,4822957) and bending electrode (seeing United States Patent (USP) 3798370,4198519) to realize.Adopt too high because of cost of manufacture, the additional complex process of on-off element, seldom adopt at present; The bending electrode, adopt figure adjustment, simplicity of design, but its electrode width D adds the amount of bow H (as shown in Figure 2) of top electrode, the capital dwindles the linear positioning area 51 that touches relatively, though the width of electrode can be done very narrowly in theory, the homogeneity of distribution of resistance is considered on manufacture craft and the electrode, and electrode width is unsuitable too narrow; And the designing technique of accurate resistor network, its electrode design is more complicated again.
Summary of the invention
The purpose of this invention is to provide a kind of employing dielectric layer and proofread and correct the nonlinear touch-screen of Electric Field Distribution.
Purpose of the present invention can reach by following measure:
A kind of with the nonlinear touch-screen of dielectric layer correction Electric Field Distribution, it comprises a conduction working plate 2 that has conducting film 20 on transparent base 21, there are around the conducting film 20 electrode 22,23,24,25, adjacent electrode to connect and have contact conductor 32 and energy and detect the pick-up unit of electric signal, it is characterized in that below the electrode 22,23,24,25 of conducting film 20, one deck dielectric insulation layer 60 being arranged from conducting film 20 at four jiao 31.
Purpose of the present invention can also reach by following measure:
The inward flange line 61 of dielectric insulation layer 60 is straight lines, and outer edge line 62 is curves;
The amount of bow H ' of the outer edge line 62 of dielectric insulation layer 60, consistent with this touch-screen along the amount of bow H that electrode edge 52 straight lines touch the formed non-linear position line 50 in location;
The amount of bow H ' of the outer edge line 62 of dielectric insulation layer 60 satisfies along the amount of bow H that electrode edge 52 straight lines touch the formed non-linear position line 50 in location with this touch-screen
| (H-H ') |/(length on the adjacent orthogonal limit of above-mentioned dielectric layer inward flange)<1%;
Electrode 22,23,24,25 above the dielectric insulation layer 60, the outer edge line 62 of necessary overwrite media insulation course 60;
The outer edge line 62 of dielectric insulation layer 60 ' be straight line, outer edge line 62 ' with the edge line 28 of the conducting film 20 gap h of being separated by; Electrode 22,23,24,25 above the dielectric insulation layer 60 must coverage gap h.
Advantage of the present invention: the present invention adopts figure adjustment, simplicity of design, and can be in electrode width scope D, and it is non-linear that correcting electrode distributes, and makes effectively linearly to touch that positioning area 51 expands to electrode edge 52 or near electrode edge 52 positions.
Description of drawings
Fig. 1 is a kind of structural representation of existing touch-screen;
Fig. 2 is the non-linear location sweep synoptic diagram of existing square frame electrode and generation thereof;
Fig. 3 is a kind of dielectric insulation layer synoptic diagram of the present invention;
Fig. 4 is an another kind of dielectric insulation layer synoptic diagram of the present invention.
Embodiment
Embodiment one
Before on as the conducting film 20 of Fig. 1, making electrode, make one deck dielectric insulation layer 60 (as Fig. 3) earlier, on above-mentioned dielectric insulation layer 60, made electrode 22,23,24,25 then again.The outer edge line 62 of above-mentioned dielectric insulation layer 60 is curves, and inward flange line 61 is straight lines.The amount of bow H ' of outer edge line 62 is consistent with the amount of bow H of non-linear position line 50.And the electrode on dielectric insulation layer 60, outer edge line 62 that must overwrite media insulation course 60 guarantees that the outer edge line 62 of the edge line of electrode and the surface of contact of following conducting film 20 and above-mentioned dielectric insulation layer 60 is consistent.For guarantee above-mentioned dielectric insulation layer 60 effectively compensating electric field distribute non-linear, can have on the conductive base of identical side's resistance with conducting film 20, make earlier the rectangle frame that surrounds by electrode 22,23,24,25 of certain width D, from four angle point outconnectors, connect touch screen driver and form experiment panel.On experiment panel, draw the straight line location along the electrode inward flange, obtain the amount of bow H of position line, and by adjusting the thickness and the resistivity of test electrode, the amount of bow H that makes the inner edges position line is less than electrode width D.And then the amount of bow H ' of design dielectric layer, make H '=H, and make the consistent of the electrode material that is produced on the dielectric insulation layer 60 and manufacture craft and experiment panel.If necessary, above-mentioned test can repeat to do by the electrode parameter of adjusting.
Embodiment two
Before on as the conducting film 20 of Fig. 1, making electrode, make one deck dielectric insulation layer 60 (as Fig. 3) earlier, on above-mentioned dielectric insulation layer 60, made electrode 22,23,24,25 then again.The outer edge line 62 of above-mentioned dielectric insulation layer 60 is curves, and inward flange line 61 is straight lines.The amount of bow H ' of outer edge line 62 and the amount of bow H of non-linear position line 50 satisfy
| (H-H ') |/(length on the adjacent orthogonal limit of above-mentioned dielectric layer inward flange)<1%.
Embodiment three
As Fig. 4.The outer edge line 62 of embodiment one medium layer by the curve of Fig. 3 become the outer edge line 62 of Fig. 4 ', outer edge line 62 ' be straight line, and above-mentioned outward flange straight line 62 ' and the edge line 28 of conducting film 20 between a gap h must be arranged.Electrode 22,23,24,25 is produced on dielectric insulation layer 60 and above the h of gap, and guarantees electrode and following conducting film 20, by gap h conducting.Require gap h much smaller than electrode width D.Thereby can make the linear zone of the Electric Field Distribution of above-mentioned electrode formation, also promptly effectively linear touch positioning area 51 is outwards expanded the scope of D-h from the position of Fig. 2.
Claims (5)
1, a kind of with the nonlinear touch-screen of dielectric layer correction Electric Field Distribution, it comprises a conduction working plate (2) that has conducting film (20) on transparent base (21), around conducting film (20) electrode (22) is arranged all around, (23), (24), (25), adjacent electrode connects and has contact conductor (32) and energy to detect the pick-up unit of electric signal from conducting film (20) four jiaos (31), it is characterized in that electrode (22 around conducting film (20), 23,24, one deck dielectric insulation layer (60) is arranged 25), the inward flange line (61) of dielectric insulation layer (60) is a straight line, outer edge line (62) is a curve, the amount of bow H ' of the outer edge line (62) of dielectric insulation layer (60), consistent with this touch-screen along the amount of bow H that electrode edge (52) straight line touches the formed non-linear position line in location (50).
2, touch-screen as claimed in claim 1 is characterized in that the amount of bow H ' of dielectric insulation layer (60) outer edge line (62), satisfies along the amount of bow H that electrode edge (52) straight line touches the formed non-linear position line in location (50) with this touch-screen
| (H-H ') |/(length on the adjacent orthogonal limit of above-mentioned dielectric layer inward flange)<1%.
3, touch-screen as claimed in claim 1 is characterized in that electrode (22), (23), (24), (25) above the dielectric insulation layer (60), the outer edge line (62) of necessary overwrite media insulation course (60).
4, touch-screen as claimed in claim 1 is characterized in that the outer edge line (62 ') of dielectric insulation layer (60) is a straight line, the edge line (28) of outer edge line (62 ') and conducting film (20) the gap h of being separated by.
5, touch-screen as claimed in claim 4 is characterized in that electrode (22), (23), (24), (25) above the dielectric insulation layer (60), must coverage gap h.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CNB031129935A CN1160661C (en) | 2003-03-18 | 2003-03-18 | Contact screen for correcting electric field distribution nonlinearity using medium layer |
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CNB031129935A CN1160661C (en) | 2003-03-18 | 2003-03-18 | Contact screen for correcting electric field distribution nonlinearity using medium layer |
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CN1442826A CN1442826A (en) | 2003-09-17 |
CN1160661C true CN1160661C (en) | 2004-08-04 |
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CNB031129935A Expired - Fee Related CN1160661C (en) | 2003-03-18 | 2003-03-18 | Contact screen for correcting electric field distribution nonlinearity using medium layer |
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Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI406551B (en) | 2007-11-06 | 2013-08-21 | Lg Electronics Inc | Mobile terminal |
KR101301521B1 (en) * | 2007-11-06 | 2013-09-04 | 엘지전자 주식회사 | Portable terminal |
WO2009125531A1 (en) * | 2008-04-10 | 2009-10-15 | シャープ株式会社 | Touch panel and display equipped with the same |
JP5278759B2 (en) * | 2009-05-28 | 2013-09-04 | 凸版印刷株式会社 | Capacitive input device |
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2003
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Granted publication date: 20040804 Termination date: 20170318 |