TOUCH SCREEN USING TACTILE SENSORS, METHOD FOR MANUFACTURING THE SAME, AND ALGORITHM IMPLEMENTING METHOD FOR THE SAME

• US 20100265208A1
• Filed: 11/06/2007
• Published: 10/21/2010
• Est. Priority Date: 10/24/2007
• Status: Abandoned Application

• Current Assignee: Korea Research Institute of Standards and Science
• Original Assignee: Korea Research Institute of Standards and Science
• Inventors: Kim, Jong-ho, Kim, Min-seok, Choi, Jae-hyuk, Park, Yon-kyu, Kang, Dae-im, Kwon, Hyun-joon
• Application Number:
  US12/739,301
• Publication Number:
  US 20100265208A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

Disclosed are a touch screen using contact resistance type tactile sensors, which can adjust the density of an object to be displayed on a screen based on the variation of a contact position and a contact force and achieve a multi-touch recognizing function, a method for manufacturing the same, and an algorithm implementing method for the same. The touch screen using contact resistance type tactile sensors includes a lower display panel such as a liquid crystal display (LCD), a transparent upper substrate, and a plurality of contact resistance type tactile sensors arranged between the upper substrate and the lower panel along the edge of the screen. The touch screen senses a contact position and a contact force based on a contact resistance generated from the contact resistance type tactile sensors, and has a multi-touch recognizing function.

Claims

1. A laminar touch screen using contact resistance type tactile sensors comprising:

upper and lower substrates; and

a plurality of contact resistance type tactile sensors arranged between the upper and lower substrates along the edge of the substrates, to allow the touch screen to sense a contact position and a contact force based on a contact resistance generated from the contact resistance type tactile sensors while achieving a multi-touch recognizing function,

wherein the contact resistance type tactile sensors sense the variation of a contact resistance according to a contact force, and

wherein each of the contact resistance type tactile sensors comprises;

electrode patterns stacked, respectively, on surfaces of the upper and lower substrates facing each other;

a spacer interposed between the upper and lower substrates to keep a distance between the upper and lower substrates; and

two resistor patterns installed, respectively, on the electrode patterns and adapted to generate different contact resistances when they come into contact with each other.

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10. A method for manufacturing a laminar touch screen using contact resistance type tactile sensors comprising:

manufacturing a plurality of contact resistance type tactile sensors; and

installing the plurality of contact resistance type tactile sensors between upper and lower substrates along the edge of the substrates, resistance values of which are changed according to a contact force,

wherein the manufacture of the contact resistance type tactile sensors comprises;

depositing electrode patterns on surfaces of the upper and lower surfaces facing each other, respectively;

forming resistor patterns, respectively, on surfaces of the electrode patterns formed on the upper and lower substrates; and

interposing a spacer between the upper and lower substrates having the resistor patterns formed on the surfaces of the electrode patterns, and bonding the upper and lower substrates to each other.

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12. An algorithm implementing method for a laminar touch screen using contact resistance type tactile sensors to enable multi-touch recognition, a plurality of contact resistance type tactile sensors being arranged between upper and lower substrates along the edge of the substrates and being adapted to sense the variation of a contact resistance, each of the contact resistance type tactile sensors comprising:

electrode patterns stacked, respectively, on surfaces of the upper and lower substrates facing each other;

a spacer interposed between the upper and lower substrates to keep a distance between the upper and lower substrates; and

two resistor patterns installed, respectively, on the electrode patterns and adapted to generate different contact resistances when they come into contact with each other, the algorithm implementing method processing a touch input on the touch screen using the contact resistance type tactile sensors adapted to sense a contact position and a contact force based on a contact resistance generated from the contact resistance type tactile sensors,

wherein the algorithm implementing method allows two or more contact positions to be sensed by tracking the distribution of forces acting on the respective contact resistance type tactile sensors, symmetrically arranged about a reference point, based on the lapse of time,

wherein the algorithm implementing method comprises inputting touch information related to a repulsive force Σ

{right arrow over (F)}_i of the total force acting on the respective contact resistance type tactile sensors, and a position {right arrow over (R)}_t of a contact point and the magnitude {right arrow over (F)}_t of force applied to the contact point based on the moment Q{right arrow over (M)}_i of the total force at the reference point,

wherein the magnitude {right arrow over (F)}_t of force applied to the contact point is equal to the repulsive force Σ

{right arrow over (F)}_i of the total force, the position {right arrow over (R)}_t of the contact point is calculated by dividing the moment Q{right arrow over (M)}_i of the total force by the magnitude {right arrow over (F)}_i of force applied to the contact point, and the moment Q{right arrow over (M)}_i of the total force is calculated from the sum of repulsive forces between the reference point and the respective contact resistance type tactile sensors,

wherein the repulsive force Σ

{right arrow over (F)}_i of the total force is represented as {right arrow over (F)}_t=Σ

{right arrow over (F)}_i=−

(F₁+F₂+F₃+F₄){right arrow over (k)}=−

P{right arrow over (k)}, the moment Q{right arrow over (M)}_i of the total force at the reference point is represented as

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