AM-OEL display, electronic system comprising the AM-OEL display and a testing method thereof
View Patent ↗A pixel testing method is provided. The pixel testing method is adapted to measure device parameters within each pixel of a display. Before plating a lighting device into each pixel, a capacitor is formed such that one end of the capacitor is connected to an open-circuit terminal of an electronic device while the other end of the capacitor is connected to an added common line (or the original scan line or data line of the display). The parameters of the electronic device connected to the lighting device are tested through a charging/discharging of the capacitor so that all the devices within a pixel can be tested before forming organic functional layer in every pixel.
1. An active matrix organic electro-luminescent display (AM-OEL display), comprising:
a substrate;
a pixel circuit disposed over the substrate;
a plurality of pixel electrodes disposed over the substrate, wherein each pixel electrode is driven by the pixel circuit;
a plurality of testing components electrically coupled to the pixel circuit, wherein each testing component provides a load to one of the pixel electrodes to measure a signal, which is input to each pixel electrode;
an organic functional layer disposed over the substrate; and
a conductive layer disposed over the organic functional layer.
2. The AM-OEL display as in claim 1 , wherein the pixel circuit comprises:
a plurality of scan lines disposed over the substrate;
a plurality of data lines disposed over the substrate; and
a plurality of driving units disposed over the substrate, each driving unit is driven by one of the scan lines and one of the data lines respectively.
3. The AM-OEL display as in claim 2 , wherein the testing components comprise capacitors, which are electrically coupled by the scan lines and the pixel electrodes.
4. The AM-OEL display as in claim 2 , wherein the testing components comprise capacitors, which are electrically coupled by the data lines and the pixel electrodes.
5. The AM-OEL display as in claim 2 , further comprising a plurality of common lines disposed over the substrate, wherein each common line is located between two adjacent scan lines.
6. The AM-OEL display as in claim 5 , wherein the testing components comprise capacitors, which are electrically coupled by the common lines and the pixel electrodes.
7. The AM-OEL display as in claim 1 , wherein the testing components of the type that stores electric charges when the pixel circuit are activated, and discharges stored electric charges when the pixel circuit are deactivated.
8. The AM-OEL display as in claim 1 , wherein each testing component comprises a capacitor.
9. An electronic system comprising the AM-OEL display as in claim 1 .
10. A method of testing the functionality of a pixel circuit for an AM-OEL display comprising an organic functional layer, which is driven by a plurality of pixel electrodes electrically connected to the pixel circuit and a conductive layer, the method comprising:
operatively coupling the testing components to the pixel circuit, wherein each testing component provides a load to one of the pixel electrodes to measure a signal, which is input to each pixel electrode in the absence of the organic functional layer;
activating the pixel circuit in the absence of the organic functional layer;
deactivating the circuit components; and
testing the functionality of the pixel circuit.
11. The method as in claim 10 , wherein the testing components comprise capacitors.
12. The method as in claim 10 , wherein the testing components comprise capacitors formed by electrically coupling by a plurality of scan lines and a plurality of pixel electrodes.
13. The method as in claim 10 , wherein the testing components comprise capacitors formed by electrically coupling by a plurality of data lines and a plurality of pixel electrodes.
14. The method as in claim 10 , wherein the testing components comprise capacitors formed by electrically coupling by a plurality of common lines and a plurality of pixel electrodes.