Patent ID: 6111564
Filing Date: 2000-08-29
Classification: G06F

Abstract:
A coordinate input display, for displaying a position corresponding to a depressed position, comprising:a display unit; anda transparent digitizer provided over the display unit with a clearance and having predetermined physical properties, including Young's modulus, length and width, the digitizer being bendable toward the display unit in accordance with a level of a depression load applied thereon,wherein the clearance between the digitizer and the display unit and a thickness of the digitizer are set such that when a maximum normal depression load is applied to the digitizer, a contact between the digitizer and the display unit is sufficiently avoided, and when no load is applied to he digitizer, a parallax produced by a distance between the digitizer and the display unit is minimized, p1 wherein the digitizer has a rectangular shape having four sides, the apparatus further comprising a casing for holding and securing the four sides of the digitizer,wherein the thickness of the digitizer is set within a range of up to a 20% increase of a computed value h in accordance with a first equation;wherein the clearance between the digitizer and the display unit is set within a range of up to a 20% increase of a computed value d in accordance with a second equation; andwherein the first and second equations for setting the thickness of the digitizer and the clearance between the digitizer and the display unit are given byh={(3.multidot..alpha..multidot.P.multidot.a.sup.2)/E}.sup.1/4,andd=3/h,where .alpha.=0.061+0.019(C-1).sup.0.4, P is the maximum depression load to be applied to the digitizer, a is a width of the digitizer, C is a ratio of a length of the digitizer to the width thereof, and E is the Young's modulus.