TFT-base plate glass

Abstract

The TFT base plate glass consists of SiO2 55-62 wt%, Al2O3 13-20 wt%, B2O3 8-12 wt%, ZrO2 0.1-4 wt%, CaO 3.5-8 wt%, MgO 0.1-5 wt%, SrO 2-6 wt%, BaO 1-4.0 wt%, ZnO 0.1-1 wt%, GeO2 0.1-2 wt%, V2O5 0-0.8 wt% and La2O3 0.1-2 wt%, as well as Sb2O3 0.1-0.3 wt% or CeO2 0.1-0.3 wt%. It has high performance and is used in producing base plate f TFT-LCD. It has thermal expansion coefficient at 25-400 deg.c of 40x10<-7> / deg.c, strain point higher than 650 deg.c, transition point higher than 710 deg.c, Ritter softening point higher than 900 deg.c, density lower than 2.55 g / cu mm, and visible light transmission rate not lower than 90 %.

Description

technical field [0001] The invention belongs to the technical field of glass, and mainly relates to a TFT substrate glass. Background technique [0002] As a terminal for information display, monitors play a very important role in the construction of an information society. Since the 1990s, flat panel display technology has risen rapidly and gradually replaced CRT with its unique charm (thin, light, low power consumption, low radiation, no flicker, etc.). As a new big country in the production and consumption of electronics industry, China's demand for flat panel displays is developing at an annual growth rate of 20%, and because China has a huge market space to support, this speed of development will continue for a long period of time . Flat-panel LCD displays are divided into three types: TN type, STN type and TFT (Thin film transistor) type. Compared with these three types, TFT type LCD has high contrast, fast response and wide viewing angle, etc. Its image quality is ...

AI Technical Summary

Problems solved by technology

The quality requirements of this kind of glass used for displays are very strict. Defects such as tiny air bubbles, stones, ribs, surface pits, and surface scars will cause errors in the display and affect image quality.

However, the melting temperature of alkali-free glass is relatively high, the melting of raw materials is difficult, and the bubbles with large glass viscosity are not easy to discharge. It is very difficult to melt high-quality glass without any tiny defects. Melting components, but the content should not be too high, too high will easily increase the density of the glass, reduce the softening temperature of the glass, and increase the thermal expansion coefficient of the glass