Manufacturing process of Color Filter
Color filter process is one of the display panel fabrication processes.
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)
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A black matrix is formed first in order to prevent any leakage of backlight and the RGB color mixture.
2. Color resist coating
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Color resist is coated on the entire glass substrate surface.
3. Exposure
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To make the pattern insoluble, it is UV cured by exposure through the photomask.
4. Development & baking
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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
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The above processes from 2 to 4 are repeated three times (for RGB).
5. Indium Tin Oxide layer formation
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ITO layer (transparent conductive layer) is formed by the spattering method.
6. Photo spacer (PS) formation
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Photo spacer is formed to control the cell gap between two glasses (color filter and TFT array) more completely to obtain improved image quality.