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Optoelectronics/Displays??

LG develops printing process for color LCD filters

Posted: 05 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:lcd filter?

South Korea-based chemical supplier LG Chem Ltd has developed a method to produce color filters used in liquid crystal displays (LCDs) that utilizes ink printing rather than photolithography, which the company claims reduces manufacturing cost and time.

According to LG Chem, the process prints ink on the surface of the LCD glass plate. By eliminating a number of photolithographic steps, the process reduces the number of production stages from 16 to 3.

Color filters are used in LCDs to improve color rendition. According to LG Chem, they account for 20 percent of the manufacturing cost of the display.

Ink jet printing has been coveted by both LCD panel and equipment suppliers in an effort to reduce manufacturing costs. LG Chem believes the process will help lower production costs for liquid crystal displays and in particular make them more attractive for large flat-panel TVs.

"In the display industry, Korea has been dependent on raw materials and manufacturing processes from Japan; however, this new development will make it unnecessary for us to rely on imports for LCD raw materials and manufacturing process," said Jong-Kee Yeo, president and chief technical officer of LG Chem, in a statement.

The concept of printing, rather than using photolithography, in display fabrication is being looked at for other display technologies as well.

For instance, Japan-based Toppan Printing and U.K.-based Cambridge Display Technology are investigating the use of roll printing techniques to fabricate displays based on light-emitting polymer (PLED) technology.

- Spencer Chin

EE Times





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