Image display device
One embodiment of the present invention is an image display device including a substantially transparent substrate, a color filter layer formed on the substantially transparent substrate and a substantially transparent semiconductor circuit formed on the color filter layer. The circuit includes a substantially transparent thin film transistor including a source electrode, a drain electrode, a gate insulating film, a gate electrode and a semiconductor active layer comprised of a metal oxide. The semiconductor active layer has a thickness of 10 nm-35 nm. The circuit also includes a wiring made of a substantially transparent conductive material, the wiring having a electric contact point with the substantially transparent thin film transistor.
1. An image display device, comprising:
a substantially transparent substrate;
a color filter layer formed on the substantially transparent substrate; and
a substantially transparent semiconductor circuit formed on the color filter layer, comprising:
a substantially transparent thin film transistor, comprising:
a source electrode;
a drain electrode;
a gate insulating film;
a gate electrode; and
a semiconductor active layer comprised of an amorphous zinc gallium indium oxide, the semiconductor active layer having a thickness of 15 nm-35 nm, the amorphous zinc gallium indium oxide having electron carrier concentration being equal to or less than 10 18 /cm 3 ;
and
a wiring made of a substantially transparent conductive material, the wiring having a electric contact point with the substantially transparent thin film transistor,
wherein the substantially transparent semiconductor circuit has on/off ratio of 3×10 7 -6×10 7 in a light irradiation state.
2. The image display device according to claim 1 ,
wherein an image display element is formed on the substantially transparent semiconductor circuit.
3. The image display device according to claim 2 ,
wherein the image display element includes a liquid crystal cell or an electrophoresis particle.
4. An image display device, comprising:
a substantially transparent substrate;
a color filter layer formed on the substantially transparent substrate; and
a substantially transparent semiconductor circuit formed on the color filter layer, comprising:
a substantially transparent thin film transistor, comprising:
a source electrode;
a drain electrode;
a gate insulating film;
a gate electrode; and
a semiconductor active layer comprised of an amorphous zinc gallium indium oxide, the semiconductor active layer having a thickness of 15 nm, the amorphous zinc gallium indium oxide having electron carrier concentration being equal to or less than 10 18 /cm 3 ;
and
a wiring made of a substantially transparent conductive material, the wiring having a electric contact point with the substantially transparent thin film transistor,
wherein the substantially transparent semiconductor circuit has on/off ratio of 6×10 7 in a light irradiation state.
5. The image display device according to claim 4 ,
wherein an image display element is formed on the substantially transparent semiconductor circuit.
6. The image display device according to claim 5 ,
wherein the image display element includes a liquid crystal cell or an electrophoresis particle.
7. An image display device, comprising:
a substantially transparent substrate;
a color filter layer formed on the substantially transparent substrate; and
a substantially transparent semiconductor circuit formed on the color filter layer, comprising:
a substantially transparent thin film transistor, comprising:
a source electrode;
a drain electrode;
a gate insulating film;
a gate electrode; and
a semiconductor active layer comprised of a metal oxide, the semiconductor active layer having a thickness of 10 nm-35 nm, the metal oxide having electron carrier concentration being equal to or less than 10 18 /cm 3 ;
and
a wiring made of a substantially transparent conductive material, the wiring having a electric contact point with the substantially transparent thin film transistor.
8. The image display device according to claim 7 ,
wherein an image display element is formed on the substantially transparent semiconductor circuit.
9. The image display device according to claim 8 ,
wherein the image display element includes a liquid crystal cell or an electrophoresis particle.