US 2011/0216034 A1Published application

Method of detecting contact state of resistive touch panel device, touch panel device, and display device

AssigneeCasio Computer Co., Ltd.

InventorMasanori SAKAMOTO

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Abstract

A method of detecting a contact state includes measuring first, second, third and fourth potentials. The method further includes deriving distance information between two points when a first resistive film contacts a second resistive film at the two points, based on the first, second, third and fourth potentials. The first, second, third and fourth potentials are potentials at fourth, second, third and fourth end regions, respectively, in first, second, third and fourth states, respectively. A first end region is an end region, as viewed in a first direction, and the second end region is an end region opposite to the first end region of the first resistive film. The third end region is an end region, as viewed in a second direction, and the fourth end region is an end region opposite to the third end region of the second resistive film.

Claims20

Dependent claims

A method of detecting a contact state of resistive touch panel device, the method comprising:

measuring, in a first state in which (i) a predetermined voltage is applied between a first end region and a second end region and (ii) a third end region is made open, a potential at a fourth end region as a first potential, the first end region being an end region of a first resistive film, as viewed in a first direction, the second end region being an end region of the first resistive film opposite to the first end region, the third end region being an end region of a second resistive film, as viewed in a second direction which intersects the first direction, and the fourth end region being an end region of the second resistive film opposite to the third end region;
measuring, in a second state in which (i) the voltage is applied between the third end region and the fourth end region and (ii) the first end region is made open, a potential at the second end region as a second potential;
measuring, in a third state in which (i) the first end region and the fourth end region are short-circuited and (ii) the voltage is applied between the first end region and the second end region, a potential at the third end region as a third potential;
measuring, in a fourth state in which (i) the first end region and the third end region are short-circuited and (ii) the voltage is applied between the first end region and the second end region, a potential at the fourth end region as a fourth potential;
and
deriving distance information between two points when the first resistive film contacts the second resistive film at the two points, based on the first potential, the second potential, the third potential and the fourth potential.

3 more elements

A resistive touch panel device comprising:

a touch panel including
(i) a first resistive film, and
(ii) a second resistive film which faces the first resistive film;
and
a driving circuit configured to perform
(i) measuring, in a first state in which (a) a predetermined voltage is applied between a first end region and a second end region and (b) a third end region is made open, a potential at a fourth end region as a first potential, the first end region being an end region of a first resistive film, as viewed in a first direction, the second end region being an end region of the first resistive film opposite to the first end region, the third end region being an end region of a second resistive film, as viewed in a second direction which intersects the first direction, and the fourth end region being an end region of the second resistive film opposite to the third end region;
(ii) measuring, in a second state in which (a) the voltage is applied between the third end region and the fourth end region and (b) the first end region is made open, a potential at the second end region as a second potential;
(iii) measuring, in a third state in which (a) the first end region and the fourth end region are short-circuited and (b) the voltage is applied between the first end region and the second end region, a potential at the third end region as a third potential;
(iv) measuring, in a fourth state in which (a) the first end region and the third end region are short-circuited and (b) the voltage is applied between the first end region and the second end region, a potential at the fourth end region as a fourth potential;
and
(v) deriving distance information between two points when the first resistive film contacts the second resistive film at the two points, based on the first potential, the second potential, the third potential and the fourth potential.

8 more elements

A display device comprising:

a display panel which displays an image;
a touch panel including
(i) a first resistive film, and
(ii) a second resistive film which faces the first resistive film;
and
a driving circuit configured to perform
(i) measuring, in a first state in which (a) a predetermined voltage is applied between a first end region and a second end region and (b) a third end region is made open, a potential at a fourth end region as a first potential, the first end region being an end region of a first resistive film, as viewed in a first direction, the second end region being an end region of the first resistive film opposite to the first end region, the third end region being an end region of a second resistive film, as viewed in a second direction which intersects the first direction, and the fourth end region being an end region of the second resistive film opposite to the third end region;
(ii) measuring, in a second state in which (a) the voltage is applied between the third end region and the fourth end region and (b) the first end region is made open, a potential at the second end region as a second potential;
(iii) measuring, in a third state in which (a) the first end region and the fourth end region are short-circuited and (b) the voltage is applied between the first end region and the second end region, a potential at the third end region as a third potential;
(iv) measuring, in a fourth state in which (a) the first end region and the third end region are short-circuited and (b) the voltage is applied between the first end region and the second end region, a potential at the fourth end region as a fourth potential;
and
(v) deriving distance information between two points when the first resistive film contacts the second resistive film at the two points, based on the first potential, the second potential, the third potential and the fourth potential.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/029,247Filed 17 Feb 2011
Priority: JP 2010-0469063 Mar 2010
Published: 8 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01R 27/08
Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant: measuring…
G06F 3/045
Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means: using resistive elements, e.g. a single continuous…
G01R
Measuring electric variables
G06F
Computing and data processing