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Display-related Products | Color Filters for Displays, Manufacturing process of Color Filter

Color filter process is one of the display panel fabrication processes.

Color filter process figure

Manufacturing process of Color Filter

Color filters can be produced by a number of methods; photolithography is a typical method. In photolithography, color filters are produced by exposing a glass substrate coated with a photosensitive color resist through the photomask. The resist is hardened to form the RGB pattern for LCDs.

1. Black matrix formation (low reflectance chrome or resin)

Black matrix formation (low reflectance chrome or resin)

A black matrix is formed first in order to prevent any leakage of backlight and the RGB color mixture.

2. Color resist coating

Color resist coating

Color resist is coated on the entire glass substrate surface.

3. Exposure

Exposure

To make the pattern insoluble, it is UV cured by exposure through the photomask.

Large-size Photomasks for Displays

4. Development & baking

Development & baking

After the removal of unnecessary portions of the color resist by the developing solution, the pattern is cured through baking.

★Repeat of 2 to 4

Repeat of 2 to 4

The above processes from 2 to 4 are repeated three times (for RGB).

5. Indium Tin Oxide layer formation

Indium Tin Oxide layer formation

ITO layer (transparent conductive layer) is formed by the spattering method.

6. Photo spacer (PS) formation

Photo spacer (PS) formation

Photo spacer is formed to control the cell gap between two glasses (color filter and TFT array) more completely to obtain improved image quality.

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