# US 8,772,893 B2 · Pixel structure having pixel electrode disposed on color filter pattern and electrically connected to underlying active device

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- Number: US 8,772,893 B2
- Document ID: US8772893B2
- Status: Granted
- Kind: B2
- Application number: 13/594,892
- Filed: 2012-08-27
- Published: 2012-12-13
- Granted: 2014-07-08
- Earliest claimed: 2009-08-04
- Assignees: Au Optronics Corporation
- Applicants: Yen-Heng Huang; Chung-Kai Chen; Chia-Hui Pai
- Inventors: Yen-Heng Huang; Chung-Kai Chen; Chia-Hui Pai
- Web page: https://patentgrep.com/patent/US8772893B2

## CPC

- H10D 30/6723: {having light shields}
- H10D 86/0229: {characterised by control of the annealing or irradiation parameters}
- H10D 86/0241: {using liquid deposition, e.g. printing}
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

A pixel structure including an active device, a capacitor electrode line, a light shielding layer, a color filter pattern and a pixel electrode is provided. The active device and the capacitor electrode line are disposed on a substrate. The light shielding layer is disposed on the substrate, and the dielectric constant of the light shielding layer is less than 6. The light shielding layer defines a unit area on the substrate, and a contact hole is formed in the light shielding layer above the active device. A color filter pattern is disposed in the unit area, wherein the dielectric constant of the color filter pattern is less than 6, and the color filter pattern does not fill into the contact hole. The pixel electrode is disposed on the color filter pattern, in which the pixel electrode fills into the contact hole so as to electrically connect with the active device.

## Claims

### Claim 1

A pixel structure, comprising:
an active device and a capacitor electrode line disposed on a substrate, wherein the active device includes a gate, a source, and a drain;
a passivation layer covering the active device;
a light shielding layer disposed on the passivation layer, to define a unit area, wherein the light shielding layer does not cover the capacitor electrode line within the unit area;
a color filter pattern disposed in the unit area defined by the light shielding layer, wherein the color filter pattern above the active device has a first hole, the passivation layer under the first hole has a contact hole, the contact hole exposes the drain, and the drain has a plurality of hole patterns; and
a pixel electrode disposed on the color filter pattern, wherein the pixel electrode electrically connects with the active device through the contact hole.

### Claim 2 (depends on 1)

The pixel structure as claimed in claim 1, wherein the color filter pattern above the capacitor electrode line has a second hole, and the pixel electrode fills into the second hole so as to form a storage capacitor with the capacitor electrode line.

### Claim 3 (depends on 2)

The pixel structure as claimed in claim 2, further comprising a buffer layer covering the light shielding layer and the color filter pattern.

### Claim 4 (depends on 1)

The pixel structure as claimed in claim 1, further comprising an upper electrode pattern disposed above the capacitor electrode line, and the upper electrode pattern is electrically connected with the active device.

### Claim 5 (depends on 4)

The pixel structure as claimed in claim 4, wherein the contact hole exposes the upper electrode pattern or the active device.

### Claim 6

A pixel structure, comprising:
an active device and a capacitor electrode line disposed on a substrate;
a light shielding layer disposed on the substrate, wherein the dielectric constant of the light shielding layer is less than 6, the light shielding layer defining a unit area on the substrate, and a contact hole is in the light shielding layer above the active device, wherein the light shielding layer is in contact with the active device;
a color filter pattern disposed in the unit area, wherein the dielectric constant of the color filter pattern is less than 6, and the color filter pattern does not fill into the contact hole; and
a pixel electrode disposed on the color filter pattern, wherein the pixel electrode fills into the contact hole so as to electrically connect with the active device, and the pixel electrode is in contact with the color filter pattern.

### Claim 7 (depends on 6)

The pixel structure as claimed in claim 6, further comprising a water repelling layer disposed on a top surface of the light shielding layer.

### Claim 8 (depends on 6)

The pixel structure as claimed in claim 6, further comprising a passivation layer disposed under the light shielding layer.

### Claim 9 (depends on 6)

The pixel structure as claimed in claim 6, wherein the light shielding layer above the capacitor electrode line has a second hole, the color filter pattern does not fill into the second hole, and the pixel electrode fills into the second hole so as to form a storage capacitor with the capacitor electrode line.

### Claim 10 (depends on 6)

The pixel structure as claimed in claim 6, further comprising an upper electrode pattern disposed above the capacitor electrode line.

### Claim 11 (depends on 10)

The pixel structure as claimed in claim 10, wherein the contact hole exposes the upper electrode pattern or the active device.