Glass etching liquid for flat panel display

Abstract

The invention discloses a flat panel display glass etching solution, including hydrogen fluoride ammonium, strong acid and pure water, thinning FPD glass to target thickness through soak method assisting with means of mechanical throwing or spraying. The invention has advantages: little toxicity, without volatilization and fast etching speed, high-usage and low cost, good glass appearance, high non defective rate, low aftertreatment cost, simple compound technology, little environmental pollution, which is a novel technology material of thinning FPD glass in future.

Description

technical field [0001] The invention relates to a glass etchant, in particular to a glass etchant used for thinning glass substrates of display screens (including TN, STN, CSTN, TFT, TP, OLED, etc.) in flat panel displays (FPDs). Background technique [0002] There are currently two methods of thinning liquid crystal displays, one is physical polishing and grinding, and the other is chemical etching. Among them, chemically thinned glass has the following characteristics: [0003] 1. Short thinning time; [0004] 2. Higher thinning output; [0005] 3. The ingredients are simple and the preparation is relatively easy. [0006] At present, there are manufacturers that carry out FPD glass thinning, most of which use hydrofluoric acid as the main raw material, and some only use a single hydrofluoric acid solution. This method has the following disadvantages: 1. Direct contact with hydrofluoric acid, high toxicity, And this liquid medicine is easy to produce hydrofluoric acid g...

AI Technical Summary

Problems solved by technology

[0006] At present, there are manufacturers that carry out FPD glass thinning, most of which use hydrofluoric acid as the main raw material, and some only use a single hydrofluoric acid solution. This method has the following disadvantages: 1. Direct contact with hydrofluoric acid, high toxicity, And this medicinal solution is easy to produce hydrofluoric acid gas, especially during the preparation process, the danger is high, if it is supplemented by heating, the danger is even higher; 2, the etching process produces white insoluble matter, which is easily suspended in the etching solution and Adhesive to pipe groove walls, difficult to handle

Moreover, the insoluble matter has strong adsorption and is easy to adhere to the surface of the FPD glass, which has a great impact on the appearance yield and post-processing of the FPD glass; 3. The rate is unstable and the utilization rate is low during the production process; 4. Due to the low utilization rate and the difficulty of waste liquid treatment, the matching waste liquid treatment cost is relatively high