Display device with capacitor having electrode formed of transparent semiconductor material
A display device including a capacitor disposed in a subpixel in the area overlapping an optical element positioned on the rear surface of a substrate of a display panel is disposed using a semiconductor material, the transparency of the area may be enhanced, and the performance of the optical function performed by the optical element forward of the surface where the display panel displays images from the rear surface of the display panel may be enhanced.
1 . A display device comprising:
a substrate including a first area having a plurality of first subpixels and a second area having a plurality of second subpixels;
a light emitting diode disposed in each of the first subpixels and second subpixels, each light emitting diodes including an anode and a cathode;
a driving transistor disposed in each of the first subpixels and second subpixels, each driving transistor having a gate electrode, a first terminal electrically coupled to a power supply source, and a second terminal electrically coupled to at least one of the anode or the cathode of the light emitting diode;
a first storage capacitor disposed in each of the first subpixels, the first storage capacitor having a first electrode and a second electrode; and
a second storage capacitor disposed in each of the second subpixels, the second storage capacitor having a first electrode and a second electrode,
wherein the first electrode of the first storage capacitor is directly connected to the gate electrode of the driving transistor in each of the first subpixels,
wherein the first electrode of the second storage capacitor is directly connected to the gate electrode of the driving transistor in each of the second subpixels,
wherein, in each of the second subpixels, the first electrode and the second electrode of the second storage capacitor are respectively disposed in layers corresponding to active layers of different transistors and are formed of transparent semiconductor materials, and
wherein an optical transparency a of the second capacitor is greater than an optical transparency of the first storage capacitor.
2 . The display device of claim 1 wherein the transparent semiconductor material includes an oxide semiconductor.
3 . The display device of claim 1 wherein the first electrode of the second storage capacitor is formed of a transparent semiconductor material disposed on a same layer as an active layer of the driving transistor, and the second electrode of the second storage capacitor is formed of a transparent semiconductor material disposed on a same layer as an active layer of a switching transistor.
4 . The display device of claim 1 wherein a transparency of each of the first electrode and the second electrode of the second storage capacitor is higher than an optical transparency of the first electrode of the first storage capacitor.
5 . The display device of claim 1 wherein a transparency of each of the first electrode and the second electrodes of the second storage capacitor is higher than an optical transparency of the second electrode of the first storage capacitor.
6 . The display device of claim 1 wherein optical transparencies of both the first electrode and the second electrode of the second storage capacitor are higher than optical transparencies of both the first electrode and the second electrode of the first storage capacitor.
7 . The display device of claim 1 , wherein the number of second subpixels disposed in the unit area in the second area is smaller than the number of first subpixels disposed in the unit area in the first area.
8 . The display device of claim 1 , wherein an absolute area of the second storage capacitor is smaller than an absolute area of the first storage capacitor.
9 . The display device of claim 1 , wherein a planar area of the second storage capacitor is smaller than a planar area of the first storage capacitor.
10 . The display device of claim 9 , wherein a ratio of an area of the second storage capacitor to an area of each second subpixel is smaller than a ratio of an area of the first storage capacitor to an area of each first subpixel.
11 . The display device of claim 1 , wherein an area of at least one of the first electrode or the second electrode of the first storage capacitor is different from an area of at least one of the first electrode or the second electrode of the second storage capacitor.
12 . The display device of claim 1 , wherein an area of the first electrode of the second storage capacitor is smaller than an area of the second electrode of the second storage capacitor.
13 . A display device, comprising:
a substrate including a first area having a plurality of first subpixels and a second area having a plurality of second subpixels;
a light emitting diode disposed in each of the first subpixels and the second subpixels, each light emitting diode having an anode and a cathode;
a storage capacitor disposed in each of the first subpixels and the second subpixels, each storage capacitor having a first electrode and a second electrode;
a driving transistor disposed in each of the first subpixels and the second subpixels, each driving transistor having a gate electrode directly connected to the first electrode of the storage capacitor, a first terminal electrically coupled to a driving voltage line, and a second terminal electrically coupled to one of the anode or the cathode of the light emitting diode; and
a connection pattern disposed on a same layer as the driving voltage line, interposed between electrode layers disposed on different layers, and electrically coupled to the electrode layers,
wherein, in each of the second subpixels, the first electrode and the second electrode of the storage capacitor are respectively disposed in layers corresponding to active layers of different transistors and are formed of transparent semiconductor materials.
14 . The display device of claim 13 , wherein the transparent semiconductor materials include an oxide semiconductor.
15 . The display device of claim 14 , wherein the connection pattern is electrically coupled to the driving voltage line.
16 . The display device of claim 13 , wherein the second electrode of the storage capacitor is electrically coupled to a power supply source.
17 . The display device of claim 13 , further comprising:
a data line configured to supply a data voltage to each of the first subpixels and the second subpixels,
wherein the data line is disposed on a same layer as the driving voltage line and the connection pattern.
18 . The display device of claim 13 , further comprising:
a switching transistor disposed in each of the first subpixels and the second subpixels.
19 . The display device of claim 18 , wherein the switching transistor includes an active layer formed of a transparent semiconductor material.
20 . The display device of claim 19 , wherein the driving transistor further includes an active layer formed of a transparent semiconductor material.
21 . The display device of claim 20 , wherein the active layer of the driving transistor is disposed on a different layer from the active layer of the switching transistor.
22 . The display device of claim 20 , wherein, in each of the second subpixels, the first electrode of the storage capacitor is disposed on a same layer as the active layer of the driving transistor, and the second electrode of the storage capacitor is disposed on a same layer as the active layer of the switching transistor.