Patent ID: 8982099
Filing Date: 2015-03-17
Classification: G06F

Abstract:
1. A touch panel comprising: a plurality of pixels each comprising a display element and a photo sensor; and an A/D converter configured to be supplied with a first potential from the photo sensor, the A/D converter comprising an oscillation circuit and a counter circuit, wherein the oscillation circuit comprises a latch circuit, wherein the oscillation circuit is configured to generate a first signal having an oscillation frequency determined in accordance with the first potential, and to store a potential of the first signal in the oscillation circuit by applying a second potential to the latch circuit, the stored potential of the first signal being used as a potential of a least significant bit of the A/D converter, wherein the counter circuit is configured to generate a second signal having a discrete value determined in accordance with the oscillation frequency, wherein the oscillation circuit starts oscillating when a third potential is applied thereto, and wherein a period from when the oscillation circuit starts oscillating to when the first signal has a toggle is approximately half an oscillation cycle of the oscillation circuit.