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...