Display device having an auxiliary electrode
AssigneeLG Display Co., Ltd.
InventorsSung-Bin Shim, Moon-Bae Gee
Life of this patent
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Abstract
A display device including an auxiliary electrode in order to prevent the luminance unevenness is provided. In the display device, an under-cut region may be formed by a first penetrating hole of a lower passivation layer and a second penetrating hole of an over-coat layer in order to connect an upper electrode to the auxiliary electrode. The second penetrating hole of the over-coat layer may be disposed to be offset from the first penetrating hole of the lower passivation layer, so that the under-cut region may be partially broken in an edge of the auxiliary electrode. Thus, the display device may improve the reliability of the electrical connection between the auxiliary electrode and the upper electrode.
Claims19
A display device comprising:
- an auxiliary electrode on a lower substrate in a non-light emitting area;
- a lower passivation layer on the auxiliary electrode, the lower passivation layer including a first penetrating hole exposing the auxiliary electrode;
- an over-coat layer on the lower passivation layer, the over-coat layer including a second penetrating hole;
- and
- a light-emitting structure in a light emitting area, the light-emitting structure including a lower electrode over the over-coat layer and the lower passivation layer, an upper electrode electrically connected to the auxiliary electrode through the first penetrating hole and the second penetrating hole, and a light-emitting layer between the lower electrode and the upper electrode,
- wherein the second penetrating hole includes a side surface intersecting, in a plan view of the display device, a side surface of the first penetrating hole,
- wherein the side surface of the second penetrating hole includes a first side region overlapping with the first penetrating hole and a second side region overlapping with the lower passivation layer, and
- wherein the first side region has a reverse taper and the second side region has positive taper.
A display device comprising:
- a thin film transistor on a lower substrate;
- an auxiliary electrode on the lower substrate, the auxiliary electrode spaced apart from the thin film transistor;
- a lower passivation layer over the thin film transistor, the auxiliary electrode, and the lower substrate, the lower passivation layer including a first contact hole overlapping with the thin film transistor and a first penetrating hole overlapping with the auxiliary electrode;
- a light-emitting structure on the lower passivation layer, the light-emitting structure including a lower electrode electrically connected to the thin film transistor through the first contact hole, an upper electrode electrically connected to the auxiliary electrode through the first penetrating hole, and a light-emitting layer between the lower electrode and the upper electrode;
- and
- an over-coat layer between the lower passivation layer and the light-emitting structure, the over-coat layer including a second contact hole overlapping with the first contact hole and a second penetrating hole overlapping the first penetrating hole,
- wherein the second penetrating hole includes a first side region that is negatively tapered and a second side region that is positively tapered.
A display device comprising:
- an auxiliary electrode on a lower substrate;
- a passivation layer on the auxiliary electrode, the passivation layer including a first penetrating hole exposing the auxiliary electrode;
- an over-coat layer on the passivation layer, the over-coat layer including a second penetrating hole overlapping the first penetrating hole, and
- a light-emitting structure including a lower electrode over the over-coat layer and the passivation layer, an upper electrode electrically connected to the auxiliary electrode through the first penetrating hole and the second penetrating hole, and a light-emitting layer between the lower electrode and the upper electrode,
- wherein the second penetrating hole includes a first side region that is negatively tapered and a second side region that is positively tapered.
Dependencies are inferred from the claim text.