Back to results
US 9,519,388 B2Granted
Touch sensor having multiple code matrices and driving method thereof
AssigneeSamsung Display Co., Ltd.
InventorHyoung-Wook Jang
Life of this patent
Estimating the term…
Abstract
A touch sensor includes a controller to detect a touch on a screen. The controller includes a voltage analyzer and a calculator. The voltage analyzer measures an output voltage of a sensing electrode of a touch sensor. The calculator calculates a capacitance between the sensing electrode and a driving electrode. The calculator calculates the capacitance based on a voltage matrix and the output voltage for one or more time periods. The voltage matrix is based on a code matrix of a plurality of code matrices.
Claims15
A touch sensor, comprising:
- a plurality of driving electrodes;
- a plurality of sensing electrodes crossing the driving electrodes;
- a touch driver to supply a touch driving signal to the driving electrodes;
- a voltage measuring unit to measure output voltages of the sensing electrodes for each time period;
- a noise detecting unit to detect a frequency of noise in at least one of the sensing electrodes;
- a memory to store a plurality of code matrices;
- and
- a capacitance calculating unit to select one matrix of the code matrices in the memory according to the detected frequency of the noise of the at least one of the sensing electrodes, and to calculate a capacitance between the at least one of the sensing electrodes and at least one of the driving electrodes using the selected one matrix of the code matrices and a voltage matrix, wherein
- the voltage matrix includes a measured output voltage corresponding to the at least one of the sensing electrodes.
6 more elements
A method of driving a touch sensor, the method comprising:
- supplying a touch driving signal to a plurality of driving electrodes;
- measuring output voltages of a plurality of sensing electrodes for each time period;
- detecting a frequency of noise in at least one of the sensing electrodes;
- and
- selecting one matrix of a plurality of code matrices according to the detected frequency of the noise of the at least one of the sensing electrodes and calculating capacitances between the sensing electrodes and the driving electrodes using the selected one matrix of the code matrices and a voltage matrix, wherein
- the voltage matrix includes the measured output voltages of the sensing electrodes.
3 more elements
A controller, comprising:
- a voltage analyzer to measure output voltages of a plurality of sensing electrodes of a touch sensor;
- a selector to select one matrix of a plurality of code matrices according to a frequency of noise in at least one of the sensing electrodes;
- and
- a calculator to calculate capacitances between the sensing electrodes and a plurality of driving electrodes of the touch sensor using the selected one matrix of the plurality of code matrices and a voltage matrix, wherein
- the voltage matrix includes the measured output voltages of the sensing electrodes.
2 more elements
Dependencies are inferred from the claim text.