Classifications

• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; 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
  • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; 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
  • G06F2203/04113—Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field

Definitions

• Touch sensors are transparent or opaque input devices for computers and other electronic systems. As the name suggests, touch sensors are activated by touch, either from a user's finger, or a stylus or some other device. Transparent touch sensors, and specifically touchscreens, are generally placed over display devices, such as cathode ray tube (CRT) monitors and liquid crystal displays, to create touch display systems. These systems are increasingly used in commercial applications such as restaurant order entry systems, industrial process control applications, interactive museum exhibits, public information kiosks, pagers, cellular phones, personal digital assistants, and video games.
• CTR cathode ray tube
• FIGs. 1 and 2 illustrate a touch screen substrate 2 in which respective X and Y excitations are produced on a touch region 4 by applying different corner voltages (in this case, 5 volts) to an electrode pattern 6 extending along the periphery 8 of the substrate 2.
• the arrows represent the direction of current flow across the touch region 4, and the dotted lines represent equipotential lines, i.e., lines along which the voltage is constant.
• the equipotential lines are perfectly straight lines, as suggested in Figs. 1 and 2. Current flows perpendicular to these equipotential lines, so lines of current flow are straight when the equipotential lines are straight.
• FIG. 3 shows a resistor chain 48 having Z-electrodes 50 with overlapping outer and inner portions 51, 52, the inner portions 52 of adjacent electrodes being closest at junctions 54.
• An array of insulating regions 55 having two gaps 56 for each overlap resistor electrode 50 runs parallel to the inner portions 52. Some of the gaps 56 are over the junctions 54.
• the gap voltage sequence is V N-1 , (V N - I + V N )/2, (V N + V N+1 )/2, V N+ ⁇ . . .
• a resistor chain 245 is spaced along each edge of the resistive layer 205 and is used for applying potentials to the resistive layer 205, so as to create orthogonal voltage gradients therein.
• the resistor chain 245 (composed of conductive regions, insulating regions, and resistive regions) includes discrete resistance units connected in series.
• the resistance values of the resistor chain 245 depend partly upon the resistive value of the resistive layer 205 that forms part of the resistor chain 245.
• the resistance values of the resistor chain 245 may vary in accordance with design requirements.
• the empty gap will be wider and the "T" shaped electrode extension 345 will be narrower.
• This design degree of freedom to provide, in part, the desired parabolic resistance variations, has the beneficial result of reducing the needed variation in gap widths to some extent, thereby improving linearity. This flexibility also helps avoid tolerance issues involving the screen-printing of extremely small conductive islands 340 and gaps 335.

Landscapes

• 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)
• Switches That Are Operated By Magnetic Or Electric Fields (AREA)
• Pressure Sensors (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Priority Applications (9)

Applications Claiming Priority (4)

Publications (3)

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ID=29254506

Family Applications (1)

Country Status (12)

Cited By (1)

Families Citing this family (26)

Family Cites Families (11)

• 2003
  • 2003-04-15 BR BR0309290-9A patent/BR0309290A/pt not_active IP Right Cessation
  • 2003-04-15 CA CA002482533A patent/CA2482533A1/en not_active Abandoned
  • 2003-04-15 EP EP03726288A patent/EP1495440B1/en not_active Expired - Lifetime
  • 2003-04-15 WO PCT/US2003/011543 patent/WO2003090156A2/en not_active Ceased
  • 2003-04-15 AT AT03726288T patent/ATE456107T1/de not_active IP Right Cessation
  • 2003-04-15 AU AU2003228533A patent/AU2003228533A1/en not_active Abandoned
  • 2003-04-15 US US10/413,825 patent/US20030231169A1/en not_active Abandoned
  • 2003-04-15 MX MXPA04010246A patent/MXPA04010246A/es unknown
  • 2003-04-15 CN CNB038134640A patent/CN100422919C/zh not_active Expired - Fee Related
  • 2003-04-15 KR KR1020047016605A patent/KR100937288B1/ko not_active Expired - Fee Related
  • 2003-04-15 DE DE60331054T patent/DE60331054D1/de not_active Expired - Lifetime
  • 2003-04-15 JP JP2003586826A patent/JP4284196B2/ja not_active Expired - Lifetime
• 2005
  • 2005-11-03 US US11/267,759 patent/US7952567B2/en not_active Expired - Lifetime

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