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Lotus Glass

Lotus glass, developed and manufactured by Corning, is a specialized brand of glass for LTPS-OLED (Low Temperature Poly Silicon-Organic Light Emitting Diode) display devices. Lotus glass has an unique attribute which is a size-stability under the high temperatures of the panel manufacturing process and enables OLED to have higher resolution. Original Lotus glass targets rigid LTPS-OLED, and Lotus NXT glass, the upgraded version of Lotus glass, targets for rigid LTPS-OLED and flexible LTPS-OLED.

LTPS-LCD (Low Temperature Poly Silicon-Liquid Crystal Device) uses a backlight to produce images in color because it does not emit light directly. However, because OLED does not use backlight but instead uses self-emitting organic diodes on and off by an electric current to produce colored images, it enables images to be displayed brighter with higher resolution. While LTPS-LCD uses liquid crystals between two sheets of glass, LTPS-OLED uses the only one sheet of thin, transparent encapsulant to deposit organic diodes on it, which is typically glass. Depositing the organic diodes on the glass happens in a high temperature,and, thus, dimensional stability of glass under a high temperature condition is the key factor in an OLED manufacturing process. As a result, Corning, a display glass manufacturing company, has developed and supplied the Lotus Glass, which is stable enough in size variation under the high temperature since 2011.

According to the expending mobile display market, brighter image, higher resolution and lower energy consumption are required. Lotus NXT Glass, which was launched by Corning in 2015, is an upgraded version of the Lotus Glass and meets these requirements by lowering total pitch variation of the Lotus Glass. The Lotus NXT Glass improved the glass size stability 60% under the high temperature condition, and, therefore, it enabled panel manufacturers to develop display panels that feature up to 100 pixels per inch higher resolutions or up to 15 percent lower power consumption. Additionally, panel makers could improve cell assembly yields by up to 1.5 percent. This glass has been applied to Samsung Galaxy Note 5 now and is also available to be applied for flexible LTPS-OLED.

On the other hand, Lotus NXT Glass has several other features besides dimensional stability such as high Young's mudules, excellent particle performance, and low CTE (Coefficient of Thermal Expansion), and this attribute enables it to be applied for flexible LTPS-OLED display. Although the flexible LTPS-OLED display uses a plastic display, high precision glass is still necessary to build the plastic high-temperature TFT as a carrier glass, and the carrier glass is then removed from the plastic display in the final laser lift-off step. In the debonding step, a high and consistent UV transmittance to maximize yields and display quality is required, and the uniform carrier thickness is an important factor for this step. Therefore, the Lotus NXT Glass, which lowered the dimensional variation, is more effective than other glass compositions for the flexible LTPS-OLED.