Light emitting display and method of fabricating the same
A light emitting display and method of fabricating the same are disclosed, wherein the light emitting display is capable of measuring the properties of a light emitting diode without the influence of a transistor. Embodiments of the light emitting display comprise a first display portion formed on a substrate and having a first pixel configured to emit light based on a current from an active driving pixel circuit having at least one transistor; and a second display portion having a second pixel configured to emit light based on a current supplied by a passive driving type on the substrate. Thereby, the luminous properties of a light emitting diode in the light emitting display can be evaluated without the influence of the transistor using a test pixel portion formed in a dummy region of the substrate.
1 . A light emitting display, comprising:
a display portion formed on a substrate and comprising a first pixel, wherein the first pixel is configured to emit light based on a current supplied from an active driving pixel circuit having at least one transistor; and
a test portion formed on the substrate and having a second pixel, wherein the second pixel is configured to emit light based on a current supplied by a passive driving method.
2 . The light emitting display according to claim 1 , wherein the first pixel comprises a light emitting diode configured to emit light based on a current supplied from a first power line, wherein the pixel circuit is electrically connected to a scan line, a data line, and the first power line.
3 . The light emitting display according to claim 1 , wherein the second pixel comprises a dummy light emitting diode electrically connected to a dummy power line and a second power line.
4 . The light emitting display according to claim 1 , wherein the second display portion is configured for testing the light emitting display.
5 . The light emitting display according to claim 3 , wherein the dummy power line is commonly formed in the second display portion.
6 . The light emitting display according to claim 3 , wherein a plurality of dummy power lines are formed in the second display portion and spaced apart from each other by a predetermined interval.
7 . The light emitting display according to claim 3 , wherein the second power line is commonly formed in the first and second display portions.
8 . The light emitting display according to claim 3 , wherein the second power line is formed independently in the first and second display portions.
9 . The light emitting display according to claim 2 , wherein the pixel circuit comprises:
a first transistor controlled by scan signals supplied to the scan line and configured to output data signals received on the data line;
a second transistor configured to supply a current to the light emitting diode from the first power line, wherein the current corresponds to a voltage supplied to a gate electrode of the second transistor from the first transistor; and
a capacitor configured to store a voltage corresponding to the data signal and drive the second transistor based on the stored voltage.
10 . A light emitting display, comprising:
a display portion formed on a substrate and comprising a pixel configured to emit light based on a current, wherein the current is supplied from a first power line by a pixel circuit having at least one transistor; and
a test portion formed in a dummy region on the substrate and comprising a dummy pixel configured to emit light based on a current supplied from a dummy power line.
11 . The light emitting display according to claim 10 , wherein the pixel comprises a light emitting diode configured to emit light based on the current supplied from the first power line by the pixel circuit, wherein the pixel circuit is electrically connected to a scan line, a data line, and the first power line.
12 . The light emitting display according to claim 10 , wherein the dummy pixel comprises a dummy light emitting diode electrically connected to the dummy power line and a second power line.
13 . The light emitting display according to claim 10 , wherein the pixel circuit comprises:
a first transistor controlled by scan signals supplied to the scan line, wherein the first transistor is configured to output data signals from the data line;
a second transistor configured to supply a current to the light emitting diode from the first power line, wherein the current corresponds to a voltage supplied from the first transistor to a gate electrode of the second transistor; and
a capacitor configured to store a voltage corresponding to the data signals and to drive the second transistor based on the stored voltage.
14 . A light emitting display, comprising:
a display portion formed in an emission region of a substrate and configured to display images; and
a test portion formed in a dummy region of the emission region with the display portion.
15 . The light emitting display according to claim 14 , wherein the display portion comprises:
a pixel circuit electrically connected to a scan line, a data line, and a first power line, each formed in the substrate; and
a pixel comprising a light emitting diode configured to emit light by receiving a current from the first power line via the pixel circuit, wherein the received current corresponds to data signals supplied to the data line.
16 . The light emitting display according to claim 14 , wherein the test portion comprises a dummy pixel comprising a dummy light emitting diode electrically connected to a dummy power line and a second power line, each formed on the substrate.
17 . A method of fabricating a light emitting display, comprising:
forming a pixel circuit defined by a plurality of scan lines, a plurality of data lines, and a power line on an emission region of a substrate, wherein the pixel circuit comprises at least one transistor configured to output a current from the power line corresponding to data signals of the data line;
forming a dummy power line in an anode electrode connected to the pixel circuit, and a dummy region of the emission region;
forming a light emitting diode for connection to the pixel circuit and forming a dummy light emitting diode for connection to the dummy power line; and
forming a cathode electrode on the light emitting diode and the dummy light emitting diode.
18 . The method according to claim 17 , further comprising forming an insulating layer configured to separate the light emitting diode and the dummy light emitting diode from each other.
19 . The method according to claim 17 , wherein the light emitting diode and the dummy light emitting diode are formed in openings exposed by the insulating layer.
20 . The method according to claim 17 , wherein forming the dummy power line comprises forming a continuous dummy power line in the dummy region.
21 . The method according to claim 17 , wherein forming the dummy power line comprises forming a plurality of dummy power lines in the dummy region, and wherein the dummy power lines are spaced apart from each other by a predetermined interval.
22 . The method according to claim 17 , wherein forming the pixel circuit comprises:
forming a buffer layer on the substrate;
forming at least one transistor and capacitor on the buffer layer; and
forming a passivation layer covering the transistor.
23 . The method according to claim 22 , wherein the dummy power line is formed on one of the buffer layer and the passivation layer.
24 . The method according to claim 17 , wherein the cathode electrode is continuously formed in the emission region and the dummy region.
25 . The method according to claim 17 , wherein the cathode electrode is separately formed in the emission region and the dummy region.