Display device
A circuit configuration is simplified to enable a color display of a high aperture ratio and multiple gradations to have no malfunction A first transistor pair composing a first inverter and a second transistor pair composing a second inverter, while bridging alternating power sources φp and φn, are caused to act as an output circuit to a pixel electrode. Diodes D 1 and D 2 having the same forward direction as the conduction direction of the first transistors are inserted into the series circuit of the first transistor pair, and the common node of the diodes is connected with the output of a switching transistor. A capacitor is connected between a common node of control electrodes of the second transistor pair and a series connection intermediate node of the second transistor pair so that the written state of data is controlled by making use of charges stored in the capacitor.
1. A display device comprising:
pixels disposed to correspond to portions, at which a plurality of scanning lines and a plurality of signal lines intersect,
wherein each of the pixels includes a pixel electrode, a switching element for selecting the pixel electrode, and a storage circuit interposed between the pixel electrode and the switching element for storing data to be written in the pixel electrode; and
a pair of alternating voltage power lines for applying alternating voltages varying in polarities opposite to each other, to the storage circuit,
wherein the storage circuit includes a first transistor pair of an NMOS transistor and a PMOS transistor connecting in series while bridging the paired alternating voltage power lines, and a second transistor pair of an NMOS transistor and a PMOS transistor connected in series while bridging the paired alternating voltage power lines,
wherein a common node of control electrodes of the first transistor pair is connected with the series connection intermediate node of the second transistor pair whereas a common node of control electrodes of the second transistor pair is connected with the series connection intermediate node of the first transistor pair,
wherein diodes having the same conduction direction as that of the NMOS transistor and the PMOS transistor composing the first transistor pair are connected in series with the NMOS transistor and the PMOS transistor composing the first transistor pair, respectively,
wherein an output node of the switching element is connected with the node of the first transistor pair whereas the series connection intermediate node of the second transistor pair is connected with the pixel electrode, and
wherein a capacitor is connected between the common node of the control electrodes of the second transistor pair and the series connection intermediate node of the second transistor pair.
2. A display device according to claim 1 ,
wherein the diodes are connected individually across the series connection intermediate node of the first transistor pair.
3. A display device according to claim 1 ,
wherein the diodes are connected individually between each of the NMOS transistor and the PMOS transistor composing the first transistor pair, and the paired alternating voltage power lines.
4. A display device according to claim 1 ,
wherein assuming each of the pixels to be a unit pixel of one color, one color pixel is composed of a plurality of the unit pixels.
5. A display device according to claim 4 ,
wherein the pixel electrodes of the individual unit pixels composing one color pixel are made of a plurality of electrodes having different areas.
6. A display device according to claim 5 ,
wherein the plural electrodes are so selected by the switching element as to correspond to the gradation display of at least 2 bits.