Display correction circuit, display correction system, and display device
View Patent ↗To improve display quality of a pixel of an organic EL panel. Display correction is performed in the pixel with a small number of transistors in the pixel of the organic EL panel. A capacitor and an oxide semiconductor transistor are formed in a display driver IC. A minute current flowing in the pixel is measured from the amount of change in capacitor voltage to correct display. Because the off-state current of an oxide semiconductor is extremely small even at high temperatures, current can be accurately measured and display images can be accurately corrected.
1. A display device comprising:
a display correction circuit comprising:
a capacitor configured to be input a driving current of a pixel;
a transistor configured to reset a potential of the capacitor;
a first terminal electrically connected to one electrode of the capacitor and one of a source and a drain of the transistor;
a buffer circuit electrically connected to the capacitor;
an AD converter configured to convert an analog output of the buffer circuit into a digital output; and
an output circuit configured to sequentially output data output from the AD converter, the output circuit comprising a shift register; and
a display region including the pixel, the pixel electrically connected to a second terminal,
wherein a channel formation region of the transistor includes an oxide semiconductor including indium,
wherein the display correction circuit is provided outside the display region, and
wherein the one electrode of the capacitor and the one of the source and the drain of the transistor are electrically connected to the pixel through the first terminal and the second terminal.
2. The display device according to claim 1 , wherein the driving current of the pixel is 100 nA or smaller.
3. The display device according to claim 1 , wherein the pixel includes an organic EL element.
4. The display device according to claim 1 ,
wherein the display region is formed over a substrate, and
wherein the display correction circuit is mounted on the substrate.
5. The display device according to claim 1 , wherein the display region and the display correction circuit are formed over a substrate.
6. A display device comprising:
a display correction circuit comprising:
a capacitor configured to be input a driving current of a pixel;
a transistor configured to reset a potential of the capacitor;
a first terminal electrically connected to one electrode of the capacitor and one of a source and a drain of the transistor;
a buffer circuit electrically connected to the capacitor;
an AD converter configured to convert an analog output of the buffer circuit into a digital output; and
an output circuit configured to sequentially output data output from the AD converter, the output circuit comprising a shift register;
an image processing circuit configured to form correction data from an output result of the output circuit and correct a video signal using the correction data;
a memory configured to store the correction data; and
a display region including the pixel, the pixel electrically connected to a second terminal,
wherein a channel formation region of the transistor includes an oxide semiconductor including indium,
wherein the display correction circuit is provided outside the display region, and
wherein the one electrode of the capacitor and the one of the source and the drain of the transistor are electrically connected to the pixel through the first terminal and the second terminal.
7. The display device according to claim 6 , wherein the driving current of the pixel is 100 nA or smaller.
8. The display device according to claim 6 , wherein the pixel includes an organic EL element.
9. The display device according to claim 6 ,
wherein the display region is formed over a substrate, and
wherein the display correction circuit is mounted on the substrate.
10. The display device according to claim 6 , wherein the display region and the display correction circuit are formed over a substrate.