Samsung Electronics recently began producing large thin film transistor LCD adopting the leading-edge color filter on array (COA) processing technology.
The COA technology enables the LCD maker to minimize defect rate of large-sized TFT LCD and reduce power consumption by raising aperture rate. It also can improve productivity by using less substrates, allowing the manufacturer to keep superior position in price competitiveness.
Simplifying processes from existing production lines, COA technology enables to produce TFT LCDs by simply applying TFT and color filter processing on glass substrates, and then coating indium, tin and oxide (ITO) on them.
Samsung Electronics has reportedly produced some 10,000 units of TFT LCDs adopting the new technology in its 5th-generation line, and supplied them to an electronic appliances maker in Japan last month.
"The larger the size of glass substrates, the higher the defect rate due to delicate placement errors occurred when veneering a TFT glass and a color filter glass," said an expert. "Adoption of COA technology, however, can sharply reduce flaw rate caused by such placement errors." These TFT LCDs are, therefore, suitable for gadgets like notebook PCs and PDAs that require little power consumption.
Samsung Electronics and LG Philips LCD developed COA technology in 2000, while Hanstar Display of Taiwan is toiling to commercialize the technology, receiving it from Toshiba of Japan.