LCD sheet glass

Abstract

The invention discloses a base plate glass with rare-earth element to dope liquid crystal display device (TFT-LCD), which is characterized by the following: comprising glass basic oxide, lanthanum oxide, cerium oxide, neodymium oxide and or yttrium oxide; setting the mass ratio at (60. 5-195):(0. 003-28) of the glass basic oxide and all rare-earth oxide; adding at least three rare-earth oxide; improving the fusion of the glass; accelerating clarification and equalization in the course of formation; preventing glass crystallizer; decreasing the liquid phase temperature; delaying devitrification speed of the glass; fitting for productive technology of float glass; improving chemical stability of the glass; decreasing the expansion coefficient; fitting for large scale float glass procession.

Description

technical field [0001] The invention relates to a boroaluminosilicate substrate glass, in particular to a boroaluminosilicate alkali-free substrate glass doped with rare earth elements, which is used for manufacturing a display screen of a thin film transistor liquid crystal display (TFT-LCD). Background technique [0002] In the process of manufacturing thin film transistor liquid crystal display (TFT-LCD), the substrate glass is subjected to repeated heat treatment, with the highest temperature reaching 625°C. In order to prevent dimensional changes caused by glass deformation, the substrate glass must remain rigid at this temperature without any viscous flow phenomenon, so the strain temperature Tst of the glass must be higher than 625°C, if the insurance amount of 25°C is added , the strain temperature of the glass should reach 650°C; considering the matching of the thermal expansion coefficient, the thermal expansion coefficient of the substrate glass should be controll...

AI Technical Summary

Problems solved by technology

Although these glasses have a high strain temperature, because the glass does not contain alkali metal oxides, the glass is difficult to melt. Generally, the melting temperature is higher than 1620 ° C. Due to the high melting temperature and high viscosity at high temperature, the glass liquid is not easy to clarify and homogenize. and because the molding temperature is relatively high, the temperature of the tin bath rises, causing serious volatilization of the tin liquid, which brings great difficulties to production

[0003] The applicant of this patent has basically solved the above problems by adding rare earth elements such as lanthanum, cerium, praseodymium and ytterbium, but there are still deficiencies, such as lowering the melting and clarifying temperature of the glass is still not ideal, and it is easy to produce analyte during the glass forming process. crystal phenomenon, therefore, it is necessary to further solve the above problems