Patent ID: 7952563
Filing Date: 2011-05-31
Classification: G02F,G06F,G09G

Abstract:
1. A touch position detecting device comprising: a touch sensing unit which senses a touch event and outputs a sensing data; a sensor control unit which receives n-th frame sensing data from the touch sensing unit; a sensing signal adjusting unit which receives the n-th frame sensing data and adjusts a level of the n-th frame sensing data to be at a constant level by determining a difference between an external light sensing data and an internal light sensing data; a touch position detecting unit which receives the n-th frame sensing data, stores the n-th frame sensing data in a first memory, updates a reference data stored in a second memory with the n-th frame sensing data provided from the touch sensing unit based on an update signal, and detects a touch position by determining a difference between the reference data and an (n+i)-th frame sensing data provided from the touch sensing unit, wherein ‘n’ and ‘i’ are natural numbers, the reference data corresponds to the n-th frame sensing data, and the n-th frame sensing data is previous to the (n+i)-th frame sensing data.