公开(公告)号：JP2000089911A

公开(公告)日：2000-03-31

申请号：JP23016499

申请日：1999-08-17

Applicant: IBM

Inventor： IVAN GEORGE COLGAN ,  JAMES LEWIS LEVIN ,  MICHAEL ALAN SCHAPERT

IPC: G06F3/041 ,  G02F1/133 ,  G02F1/1333 ,  G06F3/033 ,  G09F9/00

Abstract: PROBLEM TO BE SOLVED: To obtain a structure which is suitable for the measurement of the position of contact between a substrate and a human body and integrated in the substrate of an LCD by providing at least one resistor which is integrated between a signal layer and a circuit, arranged integrally on the substrate, and is formed together with the signal layer. SOLUTION: Resistors Ri are symmetrically in the center of a screen and Ri=Rn+1-i. When the screen is linearly correctly, equal potentials are horizontal lines and at equal intervals from the top to the bottom. Specially, the whole upper edge part has a corner part potential +Vm and the lower edge part has -Vm. The current density is proportional to an electric field, which is proportional to the gradient of the potential distribution. Therefore, when the equal potentials are straight lines having equal intervals, the current density is constant crossing the screen and flows vertically from the top to the bottom. Potential variation along a long-side resistor Re accurately matches potential variation in the screen. This condition is met only when the long-side resistor Re has constant resistance per unit length and the potential at the junction between a corner part resistor Rc and the long-side resistor Re is equal to the corner part voltage Vm.

公开(公告)号：JP2000105670A

公开(公告)日：2000-04-11

申请号：JP23015599

申请日：1999-08-17

Applicant: IBM

Inventor： IVAN GEORGE COLGAN ,  JAMES LEWIS LEVIN ,  MICHAEL ALAN SCHAPERT ,  GREGORY FLASER RUSSELL

IPC: G06F3/044 ,  G02F1/1333 ,  G02F1/1343 ,  G06F3/033 ,  G06F3/041 ,  G06F3/03

Abstract: PROBLEM TO BE SOLVED: To provide a structure to be integrated in the substrate of an LCD suitably for measuring the position of contact between the substrate and one part of human body. SOLUTION: Respective plural cells of a liquid crystal display device for providing a touch input function are provided with a first substrate to integrate a common electrode 28, a second substrate 24 to integrate a pixel electrode and liquid crystal materials arranged between the common electrode and pixel electrode. A first conductive layer (signal layer) and a second conductive layer (protecting plane layer) are integrated on the substrate and arranged between the first substrate and common electrode. The position of contact between the first substrate and a touch input device is determined by impressing a first signal to the signal layer. A second signal is impressed to the protecting plane layer so that capacitive coupling between the signal layer and common electrode is lowered. The second signal can be generated by scaling the amplitude of the first signal or shifting the phase.