# US 2008/0185589 A1 · Display substrate having the same and method of manufacturing the display substrate

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- Number: US 2008/0185589 A1
- Document ID: US20080185589A1
- Status: Published application
- Kind: A1
- Application number: 12/027,102
- Filed: 2008-02-06
- Published: 2008-08-07
- Earliest claimed: 2007-02-07
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Kyoung-Ju Shin; Jang-Soo Kim; Chong-Chul Chai
- Web page: https://patentgrep.com/patent/US20080185589A1

## CPC

- G02F 1/136213: {Storage capacitors associated with the pixel electrode}
- G02F 1/136222: {Colour filters incorporated in the active matrix substrate}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A display substrate includes a thin-film transistor (TFT) layer, a color filter layer and a pixel electrode formed on a substrate. The TFT layer includes a gate line, a data line electrically insulated from the gate line and extending in a direction different from the gate line, a TFT electrically connected to the gate line and the data line, and a storage electrode formed from the same layer as the gate line in each pixel. The color filter layer includes a storage hole extending to a portion of the TFT layer corresponding to the storage electrode. The storage hole has a horizontal cross-sectional area greater than the storage electrode, wherein the horizontal cross-sectional area is measured in a plane parallel to the substrate. The pixel electrode is formed on the color filter layer and in the storage hole to form a storage capacitor with the storage electrode.

## Claims

### Claim 1

A display substrate comprising:
a substrate;
a thin-film transistor (TFT) layer formed on the substrate, the TFT layer including a gate line, a data line electrically insulated from the gate line by a gate insulating layer and extended in a direction different from the gate line, a TFT electrically connected to the gate line and the data line, and a storage electrode formed in each pixel, wherein the storage electrode is formed from a same layer as the gate line;
a color filter layer including a storage hole extending to a portion of the TFT layer corresponding to the storage electrode, the storage hole having a horizontal cross-sectional area greater than the storage electrode, wherein the horizontal cross-sectional area is measured in a plane parallel to the substrate; and
a pixel electrode formed on the color filter layer and in the storage hole over the storage electrode to form a storage capacitor, the gate insulating layer being interposed between the pixel electrode and the storage electrode.

### Claim 2 (depends on 1)

The display substrate of claim 1, wherein the color filter layer comprises a red color filter, a green color filter and a blue color filter formed in each pixel.

### Claim 3 (depends on 2)

The display substrate of claim 2, wherein the color filter layer has a thickness of about 2.5 μm to about 3.5 μm and a maximum difference in thicknesses of the red, green and blue color filters is about 2,000 Å.

### Claim 4 (depends on 2)

The display substrate of claim 2, the maximum difference in the opening widths of the storage holes among the red, green and blue color filters is about 3 μm, and a dielectric constant of each of the red, green and blue color filters is in a range of about 3.3 to about 3.5.

### Claim 5 (depends on 1)

The display substrate of claim 1, further comprising a light-blocking layer covering an area between an edge portion of the storage hole and an edge portion of the storage electrode.

### Claim 6 (depends on 5)

The display substrate of claim 5, wherein the light-blocking layer is formed from a same layer as the data line.

### Claim 7 (depends on 6)

The display substrate of claim 6, wherein the light-blocking layer is in a floating state.

### Claim 8 (depends on 1)

The display substrate of claim 1, further comprising a column spacer formed on the pixel electrode, the column spacer having a horizontal cross-sectional area greater than the storage hole.

### Claim 9 (depends on 8)

The display substrate of claim 8, wherein the column spacer is formed using a material that blocks light.

### Claim 10 (depends on 9)

The display substrate of claim 9, further comprising a light-blocking layer formed from a same layer as the data line and disposed at an edge portion of the column spacer.

### Claim 11

A display apparatus comprising:
a display substrate including:
a substrate;
a TFT layer formed on the substrate, the TFT layer including a gate line, a data line electrically insulated from the gate line by a gate insulating layer and extended in a direction different from the gate line, a TFT electrically connected to the gate line and the data line, and a storage electrode formed in each pixel, wherein the storage electrode is formed from a same layer as the gate line;
a color filter layer including a storage hole extending to a portion of the TFT layer corresponding to the storage electrode, the storage hole having a horizontal cross-sectional area greater than the storage electrode, wherein the cross-sectional area is measured in a plane parallel to the substrate; and
a pixel electrode formed on the color filter layer and in the storage hole to overlap the storage electrode and form a storage capacitor, the gate insulating layer being interposed between the pixel electrode and the storage electrode;
a cover substrate positioned substantially parallel to the display substrate, the cover substrate including a common electrode formed on a surface of the cover substrate that faces the display substrate; and
a liquid crystal layer disposed between the display substrate and the cover substrate.

### Claim 12 (depends on 11)

The display apparatus of claim 11, wherein the display substrate further comprises a light-blocking layer that is formed from a same layer as the data line and covers a portion between an edge of the storage hole and an edge of the storage electrode.

### Claim 13 (depends on 11)

The display apparatus of claim 11, wherein the display substrate further comprises a column spacer that is formed on the pixel electrode corresponding to the storage hole and has a horizontal cross-sectional area greater than the storage hole.

### Claim 14 (depends on 13)

The display apparatus of claim 13, wherein the column spacer is formed using a material that blocks light.

### Claim 15 (depends on 13)

The display apparatus of claim 13, wherein the display substrate further comprises a light-blocking layer which is formed from a same layer as the data line and is disposed at an edge of the column spacer.

### Claim 16 (depends on 11)

The display apparatus of claim 11, wherein the cover substrate further comprises a black matrix that corresponds to the storage hole and has a horizontal cross-sectional area greater than the storage hole.

### Claim 17 (depends on 16)

The display apparatus of claim 16, wherein the display substrate further comprises a light-blocking layer that is formed from a same layer as the data line and corresponds to an edge portion of the black matrix.

### Claim 18 (depends on 16)

The display apparatus of claim 16, wherein the display substrate further comprises a column spacer that is formed on the pixel electrode corresponding to the storage hole and has a horizontal cross-sectional area greater than the storage hole.

### Claim 19 (depends on 14)

The display apparatus of claim 14, wherein the column spacer is formed using a material that blocks light.

### Claim 20 (depends on 14)

The display apparatus of claim 14, wherein the display substrate further comprises a light-blocking layer which is formed from a same layer as the data line and is disposed at an edge portion of the column spacer.

### Claim 21

A method of manufacturing a display substrate, comprising:
providing a substrate;
forming a TFT layer on the substrate, the TFT layer including a gate line, a data line electrically insulated from the gate line by a gate insulating layer, a TFT electrically connected to the gate line and the data line, and a storage electrode formed from a same layer as the gate lines in each pixel, the data line extending in a direction different from the gate line;
forming a color filter layer including a storage hole extending to a portion of the TFT layer corresponding to the storage electrode, the storage hole having a horizontal cross-sectional area greater than the storage electrode, wherein the horizontal cross-sectional area is measured in a plane parallel to the substrate; and
forming a pixel electrode on the color filter layer and in the storage hole, the pixel electrode overlapping the storage electrode to form a storage capacitor, the gate insulating layer being interposed between the pixel electrode and the storage electrode.

### Claim 22 (depends on 21)

The method of claim 21, wherein forming the color filter layer comprises:
forming a red color filter;
forming a green color filter; and
forming a blue color filter.

### Claim 23 (depends on 22)

The method of claim 22, wherein the red color filter, the green color filter and the blue color filter are formed using masks having a same design.

### Claim 24 (depends on 21)

The method of claim 21, wherein the TFT layer further comprises a light-blocking layer which is formed from a same layer as the data line and covers a portion between an edge of the storage hole and an edge of the storage electrode.

### Claim 25 (depends on 21)

The method of claim 21, further comprising forming a column spacer which is formed on the pixel electrode corresponding to the storage hole and has a horizontal cross-sectional area greater than the storage hole.

### Claim 26 (depends on 25)

The method of claim 25, wherein forming the column spacer comprises using a material that blocks light.

### Claim 27 (depends on 26)

The method of claim 26, further comprising forming a light-blocking layer from a same layer as the data line, the light-blocking layer being disposed at an end portion of the column spacer.