Display device having a light emitting layer on the auxiliary layer
View Patent ↗A display device, in which self-luminous elements are arranged, prevents a leakage current through a common layer, provided for the self-luminous elements and disposed throughout its image display area, from causing adjacent pixels to emit unintended light. A light-emitting element layer 102 includes a lower layer 102 d and a light-emitting layer. The lower layer 102 d has carrier mobility and includes a carrier transport layer or a carrier injection layer. The lower layer 102 d is stacked on lower electrodes 100 and banks 106 . The light-emitting layer is stacked on the lower layer 102 d . An upper electrode 62 is disposed on the light-emitting element layer 102 and supplies carriers to the light-emitting element layer 102 together with each lower electrode. A lower layer 102 d has a dividing area 112 on the bank. The dividing area 112 prevents carriers from traveling between adjacent pixels through the lower layer 102 d.
1. A display device comprising:
a plurality of pixels;
pixel electrodes each provided in each of the plurality of pixels;
a bank positioned in a border between the plurality of pixels, the bank exposing part of each of the pixel electrodes;
an auxiliary layer on the pixel electrodes and the bank, the auxiliary layer including at least one of a carrier transport layer and a carrier injection layer;
a light-emitting layer on the auxiliary layer; and
a counter electrode positioned on the light-emitting layer, the counter electrode spreading over the plurality of pixels, wherein
the auxiliary layer has a dividing area on the bank, and
the dividing area has lower carrier mobility than an area of the auxiliary layer has, the area being different from the dividing area.
2. The display device according to claim 1 , wherein
the dividing area is positioned on a top of the bank, and
the auxiliary layer is divided at the dividing area.
3. The display device according to claim 2 , wherein
the auxiliary layer is separated corresponding to the each of the plurality of pixels.
4. The display device according to claim 1 , wherein
the dividing area does not have the carrier mobility.
5. The display device according to claim 4 , wherein
deterioration of material of the auxiliary layer formed in the dividing area causes the dividing area to have lost the carrier mobility.
6. The display device according to claim 1 , wherein
the plurality of pixels include a first pixel of a first luminescent color and a second pixel of a second luminescent color adjacent to the first pixel, and
the dividing area is disposed in at least part of a border between the first and second pixels.
7. The display device according to claim 1 , wherein
the display device is an organic EL display device, and
the auxiliary layer includes a hole transport layer.
8. A display device comprising:
a plurality of pixels;
pixel electrodes each provided in each of the plurality of pixels;
a bank positioned in a border between the plurality of pixels, the bank exposing part of each of the pixel electrodes;
an auxiliary layer on the pixel electrodes and the bank, the auxiliary layer including at least one of a carrier transport layer and a carrier injection layer;
a light-emitting layer on the auxiliary layer; and
a counter electrode positioned on the light-emitting layer, the counter electrode spreading over the plurality of pixels, wherein
the auxiliary layer is divided on a top of the bank so as to correspond to the each of the plurality of pixels.
9. The display device according to claim 8 , wherein
the plurality of pixels include a first pixel of a first luminescent color and a second pixel of a second luminescent color adjacent to the first pixel, and
the auxiliary layer is divided in at least part of a border between the first and second pixels.
10. The display device according to claim 8 , wherein
the display device is an organic EL display device, and
the auxiliary layer includes a hole transport layer.