Display device having an image erasing circuit that is independent of the driving circuit and an image erasing method

摘要

A display device including a display layer displaying a black or white color according to an applied voltage, a transparent and non-transparent electrode that are disposed to sandwich the display layer, and a TFT driving circuit capable of applying any given voltage between the pair of electrodes. Also provided is a connection destination switching switch capable of switching the connection destination of the entire transparent electrode to an earth terminal or a connector power source terminal of an external power source connector. With this configuration, a voltage can be applied between the pair of electrodes without using the TFT driving circuit. Accordingly, if the TFT driving circuit fails to operate due to trouble caused by the displaying of information which is not permitted to be shown to others, a voltage can be applied to the display layer so that the displayed information can be erased.

主权项

1. A display device comprising:
a first electrode; a plurality of second electrodes; a non-volatile display layer that displays an image, the non-volatile display layer being disposed between the first electrode and the plurality of second electrodes; a driving circuit that drives the non-volatile display layer by applying potentials to the plurality of second electrodes to correspond to information of the display image, respectively; and an image erasing circuit including:
a connector that connects the first electrode to an external power source, anda sensor that detects that a plug for supplying the external power source is inserted into the connector, wherein the image erasing circuit erases the displayed image by connecting the first electrode to the external power source through the connector, independent of the driving circuit, when the driving circuit is broken and the displayed image cannot be erased, to make a potential of the first electrode different from the potentials of the plurality of second electrodes, and when the sensor detects that the plug is inserted into the connector, the external power source is electrically connected to the first electrode.