| AD SEMICONDUCTOR CO., LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120092291 | MULTI-TOUCH RECOGNITION RESISTIVE TOUCH SCREEN FOR RECOGNIZING MULTI-TOUCH COORDINATES THROUGH CAPACITOR CHARGING TIME - The present invention relates to a resistive touchscreen for recognizing touch coordinates through a capacitor charging time constant, and more specifically, the invention comprises: an equal resistance line operating means for obtaining the same resistance line according to an (R | 04-19-2012 |
| 20090302871 | METHOD AND APPARATUS FOR DETECTING CAPACITANCE USING A PLURALITY OF TIME DIVISION FREQUENCIES - Disclosed herein is a method for detecting capacitance including: allowing an oscillator to output a plurality of time division oscillation frequencies according to the capacitance detected by a capacitance detection plate; counting the plurality of time division oscillation frequencies during a predetermined time period; and offsetting increasing and decreasing of the oscillation frequencies due to noise such that a count value becomes uniform over the predetermined time period. Even when external noise is applied, distortion of the oscillation frequency due to the external noise is minimized and the oscillation frequency varies depending on only the capacitance of the capacitance detection plate. Accordingly, it is possible to prevent an error due to the noise at the time of the detection of the capacitance. | 12-10-2009 |
| 20090207053 | CHARACTER INPUT APPARATUS - Disclosed herein is a character input apparatus including a keypad with a reference key and a plurality of peripheral keys surrounding the reference key, and a recognition device which recognizes characters respectively applied to the reference key and the peripheral keys to be inputted if the reference key and the peripheral keys are respectively pressed so as to perform pressing inputs and recognizes character respectively applied to directions to be inputted if the peripheral keys are respectively pressed while the reference key is pressed so as to perform directional inputs. Accordingly, it is possible to improve convenience in character input and increasing a character input speed, by reducing the number of times of pressing of keys and eliminating input inconvenience due to a “pause” function using a directional input and a U-turn reverse direction input. | 08-20-2009 |
