Display device having improved substrate and method of manufacture
View Patent ↗A display device having improved aperture ratio includes a switching element, a liquid crystal capacitor and a storage capacitor. The switching element is electrically connected to a gate line and a source line crossing each other. The liquid crystal capacitor has a pixel electrode electrically connected to the switching element through a first contact to define a pixel area. The storage capacitor has a storage line partially overlapping the source line. The storage line is electrically connected to the pixel electrode through a second contact hole.
1. A display substrate comprising:
a gate line;
a source line crossing the gate line;
a storage line formed from the same layer as the gate line, the storage line partially overlapping the source line; and
a pixel electrode partially overlapping the source line to define a pixel area, the pixel electrode being electrically connected to the storage line.
2. The display substrate of claim 1 , further comprising:
an organic insulation layer formed between the source line and the pixel electrode.
3. The display substrate of claim 1 , further comprising:
a color filter layer formed between the source line and the pixel electrode.
4. The display substrate of claim 1 , further comprising:
a switching element electrically connected to an (n)th gate line and an (m)th source line, wherein ‘m’ and ‘n’ are natural numbers.
5. The display substrate of claim 4 , wherein the storage line overlaps the (m)th source line and (m−1)th source line, and is formed in one of an upper portion of the pixel area and a lower portion of the pixel area when seen in plan view.
6. The display substrate of claim 5 , wherein the storage line has a U-shape that is opened toward the (n)th gate line or an (n−1)th gate line.
7. The display substrate of claim 4 , wherein the storage line overlaps the (m)th source line or (m−1)th source line, as seen in plan view.
8. A display device comprising:
a switching element electrically connected to a gate line and a source line crossing each other;
a liquid crystal capacitor having a pixel electrode electrically connected to the switching element through a first contact to define a pixel area; and
a storage capacitor having a storage line partially overlapping the source line, the storage line electrically connected to the pixel electrode through a second contact hole.
9. The display device of claim 8 , wherein the capacitance ratio ((Cpix-Clc)/Clc) between the liquid crystal capacitor and the storage capacitor is in a range of about 0.4 to about 0.6,
wherein Cpix denotes the total capacitance of a capacitor formed in the pixel area, Clc denotes the capacitance of the liquid crystal capacitor, and Cst denotes the capacitance of the storage capacitor.
10. The display device of claim 9 , wherein the liquid crystal capacitor is defined by the pixel electrode, a common electrode facing the pixel electrode and a liquid crystal layer interposed between the pixel electrode and the common electrode.
11. The display device of claim 9 , wherein the storage capacitor comprises the storage line, a gate insulation layer formed on the storage line, a source line formed on the gate insulation layer that overlaps the storage line, an organic insulation layer formed on the source line, and the pixel electrode partially overlapped by the source line.
12. The display device of claim 9 , wherein the storage capacitor comprises the storage line, a gate insulation layer formed on the storage line, a source line formed on the gate insulation layer overlapped by the storage line, a color filter layer formed on the source line, and the pixel electrode partially overlapped by the source line.
13. The display device of claim 9 , wherein the switching element comprises a gate electrode electrically connected to an (n)th gate line, a source electrode electrically connected to an (m)th source line, and a drain electrode electrically connected to the source electrode, wherein ‘m’ and ‘n’ denote a natural number.
14. The display device of claim 13 , wherein the storage line overlaps the (m)th source line and the (m−1)th source line, and is formed in one of an upper portion of the pixel area and a lower portion of the pixel area when viewed on a plan.
15. The display device of claim 14 , wherein the storage line has a U-shape that is opened toward the (n)th gate line or the (n−1)th gate line.
16. The display device of claim 13 , wherein the storage line overlaps the (m)th source line or the (m−1)th source, as seen in plan view.
17. A method of manufacturing a display substrate comprising:
forming a storage line on each of pixel areas of a base substrate having a plurality of pixel areas defined thereon;
forming a gate insulation layer on the storage line;
forming a source line on the gate insulation layer, the source line overlapping the storage line; and
forming a pixel electrode on the source line to overlap a portion of the source line.
18. The method of claim 17 , further comprising:
forming an organic insulation layer between the source line and the pixel electrode.
19. The method of claim 17 , further comprising:
forming a color filter layer between the source line and the pixel electrode.
20. The method of claim 17 , further comprising:
forming a contact hole that exposes an end portion of the storage line,
wherein the pixel electrode is contacted by the end portion of the storage line through the contact hole.