Touch Sensing System
AssigneeLG Display Co., Ltd.
InventorsBeomjin Kim, Sunghoon On
Life of this patent
Estimating the term…
Abstract
A touch sensing system includes a charge distributor, a pre-amplifier, an analog-to-digital converter (ADC), and a temperature compensating device. The temperature compensating device varies one or more of a first reference voltage supplied to the charge distributor, a second reference voltage supplied to the pre-amplifier, and the capacitance of the charge distributor, in response to temperature data from a temperature sensor.
Claims23
A touch sensitive display device comprising:
- a temperature sensor configured to sense a temperature of the touch sensitive display device;
- a temperature compensation circuit comprising an input terminal coupled to the temperature sensor and a first output terminal, the temperature compensation circuit configured to adjust a first voltage at the first output terminal based on the sensed temperature;
- and
- a touch sensor circuit comprising a first input terminal and a second input terminal, the first input terminal of the touch sensor circuit coupled to at least one electrode of the touch sensitive display device, the second input terminal of the touch sensor circuit coupled to the first output terminal of the temperature compensation circuit, the touch sensor circuit configured to generate touch data compensated for a change in the temperature of the touch sensitive device based on the first voltage.
A touch sensor circuit for a touch sensitive display device, comprising:
- a temperature compensation circuit comprising a first output terminal and an input terminal configured to receive a sensor signal representing temperature of the touch sensitive display device, the temperature compensation circuit configured to adjust a first voltage at the first output terminal based on the sensor signal;
- and
- a touch sensor circuit comprising a first input terminal and a second input terminal, the first input terminal coupled to at least one electrode in the touch sensitive display device, the second input terminal coupled to the first output terminal of the temperature compensation circuit, the touch sensor circuit configured to generate a touch data compensated for a change in the temperature based on the first voltage.
A method for operating a touch sensitive display device, the method comprising:
- receiving a sensor signal representing temperature of the touch sensitive display device at a temperature compensation circuit;
- adjusting a first voltage at a first output terminal of the temperature compensation circuit based on the received sensor signal;
- detecting electrode voltage of at least one electrode in the touch sensitive display device;
- and
- generating a touch data compensated for a change in the temperature of the touch sensitive display device based on the electrode voltage and the first voltage.
Dependencies are inferred from the claim text.