Touch panel having 30 to 45 degree angle between direction of display unit elements and direction of input unit elements

• US 5,715,024 A
• Filed: 02/25/1997
• Issued: 02/03/1998
• Est. Priority Date: 01/27/1995
• Status: Expired due to Term

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Limited
• Inventors: Kurashima, Shigemi, Sakaguchi, Akihiko, Kurasawa, Katsuhiro
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): TON, MINH TOAN T
• Application Number:
  US08/805,775
• Time in Patent Office: 343 Days
• Field of Search: 349/23, 349/12, 349/24, 345/156, 345/175
• US Class Current: 349/23
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel includes a display unit having display elements which are arranged in a first lattice, and an input panel, put on the display unit, having a structure in which transparent resistive films maintained at a predetermined distance by insulating dot spacers are provided on a transparent substrate, the insulating dot spacers being arranged in a second lattice, wherein a relative angle Θ between a direction in which the display elements are arranged in the first lattice and a direction in which the insulating dot spacers are arranged in the second lattice falls in a range of 15°≦Θ≦30°.

Claims

1. A touch panel comprising:

a display unit having display elements which are arranged in a first lattice; and

an input panel, disposed on said display unit, having a structure comprising transparent resistive films maintained at a predetermined distance by insulating dot spacers and provided on a transparent substrate, the insulating dot spacers being arranged in a second lattice, wherein a relative angle Θ

between a direction in which the display elements are arranged in the first lattice and a direction in which the insulating dot spacers are arranged in the second lattice falls in a range of;

2. °

<

Θ

<

4°

.

wherein a value "a" (a≧

0) representing a relationship between a lattice interval of the first lattice and a lattice interval of the second lattice satisfies a condition of ##EQU7## where a'"'"' is either √

2/(1+a) -1 or (1+a)/√

2-1 and is equal to or greater than zero, and d'"'"' is a smaller one of d and d(1+a)/√

2, the lattice interval being an interval between adjacent lines of the lattice, the lattice intervals of the first lattice and the second lattice respectively having values d and d(1+a) or d(1+a) and d.