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US 9,310,915 B2Granted
Touch panel and driving method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYoshiyuki Kurokawa
Life of this patent
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Abstract
An object is to provide a touch panel with high-accuracy and high-speed operation. A touch panel includes a plurality of pixels each including a display element and a photo sensor, a photo sensor reading circuit to which an output signal of the photo sensor is provided, a display element select circuit which provides an image signal to the display element, a plurality of edge sensitive latches provided in series, and a logic circuit. The logic circuit generates a signal by performing a logic operation on an output signal of the plurality of edge sensitive latches and provides the generated signal to the photo sensor reading circuit.
Claims26
A touch panel comprising:
- a plurality of photo sensors;
- a plurality of A/D converter circuits configured to be input with photo sensor signals of the plurality of photo sensors;
- and
- a timing signal generator circuit comprising:
- a shift register comprising a plurality of latches provided in series;
- and
- a logic circuit configured to generate signal by performing logic operation on plural output signals of the shift register;
- wherein the timing signal generator circuit is configured to generate a plurality of control signals for controlling the plurality of A/D converter circuits in time sequence,
- wherein each of the plurality of control signals comprises plural output signals of the shift register and the signal generated by the logic circuit, and
- wherein the plurality of A/D converter circuits are configured to operate converting the photo sensor signals in accordance with the plurality of control signals in time sequence.
7 more elements
A touch panel comprising:
- a plurality of photo sensors;
- a plurality of A/D converter circuits configured to be input with photo sensor signals of the plurality of photo sensors;
- a display element select circuit configured to supply an image signal to a display element;
- and
- a timing signal generator circuit comprising:
- a shift register comprising a plurality of latches provided in series;
- and
- a logic circuit configured to generate signal by performing logic operation on plural output signals of the shift register;
- wherein the timing signal generator circuit is configured to generate a plurality of control signals for controlling the plurality of A/D converter circuits in time sequence,
- wherein each of the plurality of control signals comprises plural output signals of the shift register and the signal generated by the logic circuit,
- wherein the plurality of A/D converter circuits are configured to operate converting the photo sensor signals in accordance with the plurality of control signals in time sequence, and
- wherein the display element select circuit is configured to be controlled by output signals of the shift register.
9 more elements
A driving method of a touch panel,
- wherein the touch panel comprises:
- a plurality of photo sensors;
- a plurality of A/D converter circuits configured to be input with photo sensor signals of the plurality of photo sensors;
- and
- a timing signal generator circuit comprising:
- a shift register comprising a plurality of latches provided in series;
- and
- a logic circuit, and
- wherein the driving method performs the following steps to each of the plurality of A/D converter circuits in time sequence:
- inputting plural output signals of the shift register to the logic circuit;
- generating a signal by performing logic operation in the logic circuit on the plural output signals of the shift register;
- and
- inputting the signal generated by the logic circuit and plural output signals of the shift register to one of the plurality of A/D converter circuits so as to operate A/D conversion of a signal output from a photo sensor.
10 more elements
A driving method of a touch panel,
- wherein the touch panel comprises:
- a plurality of photo sensors;
- a plurality of A/D converter circuits configured to be input with photo sensor signals of the plurality of photo sensors;
- a display element select circuit;
- and
- a timing signal generator circuit comprising:
- a shift register comprising a plurality of latches provided in series;
- and
- a logic circuit,
- wherein the driving method performs the following steps to each of the plurality of A/D converter circuits in time sequence:
- inputting plural output signals of the shift register to the logic circuit and to the display element select circuit;
- generating a signal by performing a logic operation in the logic circuit on the plural output signals of the shift register;
- and
- inputting the signal generated by the logic circuit and plural output signals of the shift register to one of the plurality of A/D converter circuits so as to operate A/D conversion of a signal output from a photo sensor, and
- wherein an image signal is supplied to a display element through the display element select circuit in accordance with output signals of the plurality of latches of the shift register which have been input to the display element select circuit.
12 more elements
Dependencies are inferred from the claim text.