International Business Machines Corporation

Hiroji Itoh

Naoki Yamada

Masaya Mori

Toshiroh Tabata

Junichi Mihara

Yasuhito Kikuchi

Since the surface of the touch panel is often slippery, pressure points of the writing stylus on a touch panel may easily skip along the input contiguous line. The present invention calculates the velocity of writing stylus movement at each segment of the input contiguous line from a touch location and detection time of each touch which may be detected at intervals, produces a line drawing which connects each pair of touch locations of touches that are temporally adjacent in the detection order with a line of a type determined based on the calculated velocity, and displays the line drawing on the LCD.

Pressure sensitive writing tablet, control method and control program therefor

An image on a liquid crystal is displayed with a constant picture quality, independent of the capacity characteristic variations of the display and the conditions of signals for displaying an image. A gate-timing control circuit 50 of a drive circuit receives input signals J1, J2, and J3 from a system 44. The signals J1 and J2 are prestored in the timing-gate control circuit 50 and contain information for selecting any of a plurality of data, each representing different timing at which a gate line 28 of an LCD 10 is turned on and off. The timing control circuit 50 selects any of the plurality of data according to the signals J1 and J2, generates a gate line control signal YOE based upon the selected data, and outputs it to a gate line driver 30. The gate line driver 30 drives the gate line 28 at timing corresponding to the gate line control signal YOE.

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Zama, Japan

Hiroji Itoh