STABLE GLASS SHEET AND METHOD FOR PRODUCING THE SAME

• Main Authors: DANIELSON PAUL STEPHEN, KICZENSKI TIMOTHY J, ELLISON ADAM JAMES
• Format: Patent
• Language: English
• Published: 22.07.2010
• Subjects: CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide, by an economical production method, a glass sheet having a pristine surface suitable for a glass substrate for production of low-temperature polysilicon-based TFT displays. SOLUTION: A glass material has an anneal point of at least 765°C and a CTE of at most 42×10-7/°C. The production method includes heating the glass material to a temperature not lower than a temperature T1corresponding to a viscosity of 1.0×1010poise, and cooling the glass material from T1to a temperature T2corresponding to a viscosity of 1.0×1015poise at a cooling rate of CR (CR≥5°C/s). The glass material, upon completion of the above final step, has a measured compaction CM675, wherein the absolute value of the measured compaction is at most 175 ppm. A fusion-draw process is suitable for the above method. COPYRIGHT: (C)2010,JPO&INPIT