Patent ID: 11893949
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. A driving method of a display device that performs binary display using a pixel circuit having a memory function,
the display device including
a plurality of pixel circuits configured to form an image to be displayed,
a first power source line and a second power source line, and
a first selection control line and a second selection control line,
each of the plurality of pixel circuits including
a display element including a pixel electrode and configured to be driven by a voltage for which a polarity is periodically inverted,
a pixel memory circuit including a first node and a second node, the first node being configured to hold one of a voltage of the first power source line and a voltage of the second power source line in accordance with a pixel corresponding to the pixel circuit of the image to be displayed, and the second node being configured to hold, of the voltage of the first power source line and the voltage of the second power source line, the voltage that is different from the voltage held at the first node, and
a voltage selection circuit configured to select a voltage to be applied to the pixel electrode from the voltage of the first node and the voltage of the second node,
the voltage selection circuit including
a first selection transistor, as a switching element, including a first conduction terminal connected to the first node, a second conduction terminal connected to the pixel electrode, and a control terminal connected to the first selection control line, and
a second selection transistor, as a switching element, including a first conduction terminal connected to the second node, a second conduction terminal connected to the pixel electrode, and a control terminal connected to the second selection control line,
the driving method comprising:
holding, in the pixel memory circuit in each of the plurality of pixel circuits, one of the voltage of the first power source line and the voltage of the second power source line at the first node in accordance with the pixel corresponding to the pixel circuit of the image to be displayed, and holding, at the second node, the voltage, of the voltage of the first power source line and the voltage of the second power source line, that is different from the voltage at the first node; and
alternately selecting, in the voltage selection circuit in each of the plurality of pixel circuits, the voltage to be applied to the pixel electrode in the pixel circuit from the voltage of the first node and the voltage of the second node by periodically turning on and off the first selection transistor and the second selection transistor in a mutually inverted manner using a voltage of the first selection control line and a voltage of the second selection control line,
wherein the alternately selecting of the voltage includes
applying, when the voltage of the first node is selected, a voltage turning on the first selection transistor to the first selection control line to cause the voltage of the first node to be applied to the pixel electrode without being affected by a threshold voltage of the first selection transistor and
applying, when the voltage of the second node is selected, a voltage turning on the second selection transistor to the second selection control line to cause the voltage of the second node to be applied to the pixel electrode without being affected by a threshold voltage of the second selection transistor.