Patent ID: 9548039
Date: 2017-01-17
CPC Classifications: G09G

Claim:
1. A display device comprising: a display portion; a pixel circuit in the display portion, the pixel circuit including an SRAM circuit; a first circuit configured to control the pixel circuit; a first antenna circuit configured to receive a first electromagnetic wave with a first wavelength; a second antenna circuit configured to receive a second electromagnetic wave different from the first electromagnetic wave; a second circuit configured to generate a first demodulation signal from the first electromagnetic wave received by the first antenna circuit; a third circuit configured to rectify the first electromagnetic wave received by the first antenna circuit; a fourth circuit configured to rectify the second electromagnetic wave received by the second antenna circuit; a fifth circuit configured to generate a first voltage from an output of the third circuit; a sixth circuit configured to generate a second demodulation signal from the second electromagnetic wave received by the second antenna circuit; a charge circuit configured to store a second voltage from an output of the fourth circuit; a charge control circuit configured to control charging of the second voltage to the charge circuit; a voltage supply control circuit; a seventh circuit configured to control the charge control circuit and the voltage supply control circuit; and an eighth circuit configured to select one of the first voltage and the second voltage, wherein the voltage supply control circuit is configured to supply the second voltage to the eighth circuit, and wherein the eighth circuit comprises a storage capacitor and the storage capacitor is configured to compensate voltage supply to the first circuit in a period when voltage is not supplied to the first circuit, which occurs when voltage selected in the eighth circuit is supplied to the first circuit.