Display substrate, method of manufacturing the display substrate and display apparatus having the display substrate
View Patent ↗A display substrate includes a pixel, an organic layer and a shorting pad structure. The pixel electrode is arranged at a display area of a base substrate, and the pixel electrode is electrically connected to a transistor connected to a gate line and data line. The organic layer is arranged at the base substrate, and the organic layer is arranged between the transistor and the pixel electrode. The shorting pad structure is disposed at a peripheral area of the display area, and the shorting pad structure includes a first pad electrode at a lower height, a second pad electrode at a higher height, and a first height compensation pattern interposed between the first and second pad electrodes. A contact hole is defined through the organic layer so that second pad electrode can be electrically connected there through to the first pad electrode.
1. A first display substrate for use with a spaced apart and overlying second substrate where one or more electrical contact connections are to be made between the first and second substrates, said first substrate having layer sections disposed at different heights relative to a bottom section of the first substrate and said first substrate further comprising:
a color filter;
a plurality of pixel electrodes disposed in a display area of the first substrate, each pixel electrode having a field producing portion and having a connecting portion where the connecting portion is electrically connected to a corresponding one of plural transistors disposed on the first substrate, each of the transistors being connected to a corresponding one of plural gate lines disposed on the first substrate and to a corresponding one of plural data lines disposed on the first substrate;
an electrically insulative organic layer disposed on the first substrate, the organic layer including sections interposed between respective ones of the transistors and the field producing portions of their corresponding pixel electrodes; and
a shorting pad structure disposed in a non-image displaying, peripheral area of the first substrate, the shorting pad surface comprising:
a first pad electrode disposed at a first height section of the first substrate;
a first height compensation structure disposed on the first pad electrode, the first substrate and first height compensation structure being disposed within a pad hole area of the first substrate, where the pad hole area is defined by a respective pad hole extending through a non-image displaying, peripheral area portion of the electrically insulative organic layer; and
a second pad electrode disposed at a second height section of the first substrate, the second height section being above the first height section, where the first height compensation structure is interposed between the first and second pad electrodes and where the second pad electrode is electrically connected to the first pad electrode by way of a contact hole defined through a contact hole exposing area of the first height compensation structure.
2. The first display substrate of claim 1 , further comprising:
a column spacer formed of a spacer material and disposed in the display area of the first substrate; and
a second height compensation structure disposed in the contact hole exposing area of the first height compensation structure so as to fill the contact hole exposing area, the second height compensation structure being made with substantially the same spacer material as that of the column spacer.
3. The first display substrate of claim 1 , wherein the color filter includes respective materials disposed to define respective color filters under corresponding ones of the pixel electrodes, wherein the first height compensation structure includes at least a first height defining layer defining a height of the first height compensation structure and being composed of substantially the same material as at least one of the color filter materials.
4. The first display substrate of claim 1 , further comprising a plurality of different color filter materials disposed to define respective color filters under corresponding ones of the pixel electrodes, wherein the first height compensation structure includes at least a first height defining layer and a second height defining layer which in combination define a height of the first height compensation structure, where the first height defining layer is composed of substantially a same first color filter material among said plurality of different color filter materials and where the second height defining layer is composed of substantially a same second color filter material among said plurality of different color filter materials.
5. The first display substrate of claim 1 , further comprising a light blocking material disposed in areas of the first substrate where the gate lines and the data lines are disposed, wherein the first height compensation structure includes a material substantially the same as the light blocking material.
6. The first display substrate of claim 1 , wherein:
the color filter comprises a plurality of different color filter materials disposed to define respective color filters under corresponding ones of the pixel electrodes; and
the first display substrate comprises a light blocking material disposed in areas of the first substrate where the gate lines and the data lines are disposed,
wherein the first height compensation structure includes at least a first height defining layer and a second height defining layer which in combination define a height of the first height compensation structure, where the first height defining layer is composed of substantially a same material as one of the one or more color filter materials and where the second height defining layer is composed of substantially a same material as the light blocking material.
7. A method of manufacturing a display substrate, the method comprising:
forming a transistor in a display area of a base substrate and a first pad electrode in a peripheral area surrounding the display area;
forming a color filter material layer on the base substrate after the transistor is formed;
forming a first height compensation structure on the first pad electrode, the first height compensation structure including part of the color filter material layer;
forming an organic layer on the base substrate on which the color filter material layer is formed, the organic layer having a pad hole formed through the organic layer and corresponding to the first pad electrode; and
forming a pixel electrode and a second pad electrode of the first height compensation structure, the pixel electrode being formed on the organic layer and being connected to the transistor, the second pad electrode being formed above a height providing intermediate sub-structure of the first height compensation structure and the second pad electrode being connected to the first pad electrode through a contact hole, the contact hole being defined through the organic layer in an area exposed by the first height compensation structure.
8. The method of claim 7 , further comprising:
forming a second height compensation structure to fill a space above the contact hole of the second pad electrode, the second height compensation structure including a column spacer material.
9. The method of claim 8 , wherein the column spacer material includes an opaque material.
10. The method of claim 7 , further comprising
forming a color filter between the base substrate and the pixel electrode using a color photo material as part of the color filter material layer,
wherein the part of the color filter material layer used in the first height compensation structure includes the color photo material.
11. The method of claim 7 , further comprising using the color filter material layer to form a plurality of color filters between the base substrate and the pixel electrode by using a plurality of different color photo materials wherein the first height compensation structure includes a plurality of height providing layers that include respective ones of the different color photo materials.
12. The method of claim 7 , further comprising:
forming the gate line and the data line;
forming a light blocking part at an area where the gate line and the data line are formed to block light by using a blocking material,
wherein the first height compensation structure includes the blocking material as at least one of one or more height providing layers of the first height compensation structure, the one or more height providing layers having respective thicknesses to compensate for height of surrounding portions of the organic layer.
13. The method of claim 12 , further comprising:
using the color filter material layer to form color filters between the base substrate and the pixel electrodes by using color photo materials;
forming the gate line and the data line; and
forming a light blocking part at an area where the gate line and the data line are formed to block light using a blocking material,
wherein the first height compensation structure includes a first height providing layer having at least one of the color photo materials and a second height providing layer having the blocking material.
14. A display device comprising:
a display substrate comprising:
a plurality of color filters;
an organic layer disposed on the base substrate and disposed between a transistor and a pixel electrode which are formed on the base substrate;
a shorting pad structure comprising:
a first pad electrode including a metal layer;
a first height compensation pattern disposed on the pad electrode in a pad hole, the pad hole being formed through the organic layer; and
a second pad electrode electrically connected to the first pad electrode through a contact hole formed at an area exposed by the first compensation pattern;
a counter substrate facing the display substrate and including a common electrode; and
a conductive sealant including a conductive ball electrically connecting the shorting pad structure with the common electrode and combining the display substrate with the counter substrate.
15. The display device of claim 14 , further comprising;
a column spacer maintaining a distance between the display substrate and the counter substrate; and
a second compensation pattern filling a space above the contact hole with substantially the same material as the column spacer.
16. The display device of claim 15 , wherein the column spacer includes an opaque material.
17. The display device of claim 14 , wherein:
the color filters are disposed between the base substrate and the pixel electrodes, and
the first height compensation pattern includes a color photo material substantially the same as used in the color filters.
18. The display device of claim 14 , further comprising:
a gate line connected to a gate electrode of the transistor;
a data line crossing the gate line and connected to a source electrode of the transistor; and
a light blocking part disposed at an area where the gate line and the data line are formed to block light,
wherein the first height compensation pattern includes a blocking material substantially the same as that of the blocking part.
19. The display device of claim 14 , further comprising:
a gate line connected to a gate electrode of the transistor;
a data line crossing the gate line and connected to a source electrode of the transistor; and
a light blocking part disposed at an area where the gate line and the data line are formed to block light,
wherein the first height compensation pattern includes a color layer having a color photo material substantially the same as at least one of the color filters and a blocking layer having a blocking material substantially the same as the blocking part.