Organic transistor with light emission, organic transistor unit and display device incorporating the organic transistor

#1. Field of the Invention

#The present invention relates to an organic transistor and associates, and, in particular, to an organic thin-film transistor having light emission function, as well as a display device employing it.

#2. Description of the Related Art

#Other objects and further features of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings:

#FIG. 1 shows an example of a configuration (a top gate type) of an organic transistor device according to the present invention;

#FIG. 2 shows an example of a configuration (a bottom gate type) of an organic transistor device according to the present invention;

#Embodiments of the present invention will now be described with reference to figures.

#The light emitting type organic thin-film transistor device according to the present invention is generally classified into a top gate type and a bottom gate type. A light emitting type organic thin-film transistor device according to the present invention in the top gate type has a source electrode and a drain electrode, in contact with an organic semiconductor layer, on a supporting body, and further thereon, has a gate electrode through a gate insulating layer. In the bottom gate type, a gate electrode is provided on a supporting body first, and a source electrode and a drain electrode are provided which are joined by means an organic semiconductor layer, through a gate insulating layer. Specific layer structure examples of the devices (sectional views of single devices) are shown in FIGS. 1 through 3.

#FIG. 1 shows one example of a layer configuration of a top gate type of a light emitting type organic thin-film transistor device. As shown, laminated layers are produced with a substrate or a sheet as a supporting body 1, and thereon, an organic semiconductor layer 2 is produced. Further, a source electrode 3 as a first electrode and a drain electrode 4 as a second electrode, electrically connected to the organic semiconductor layer 2, are arranged in a predetermined position with a predetermined distance. In an area between the pair of these electrodes, a gate electrode 6 as a third electrode is disposed through a gate insulating layer 5. In other words, the gate insulating layer 5 is disposed to cover a top surface of the organic semiconductor layer 2 and the source electrode 3 and the drain electrode 4, and further, the gate electrode 6 is disposed at an appropriate position on the gate insulating layer 5 (position between the source electrode 3 and the drain electrode 4). Then, a voltage is applied between the source electrode 3 and the drain electrode 4 in such a range that the organic semiconductor layer 2 emits light. Further, a voltage is applied to the gate electrode so as to control the light emission.