The thickness of the glass substrate can be measured by spectral confocal measurement

The glass substrate is the basic component of liquid crystal display devices, which is an extremely flat surface float method to produce thin glass sheets. The main thicknesses of glass substrates available on the market are 0.7mm and 0.5mm, and even thinner (such as 0.4mm) processes are underway. Basically, a TFT-LCD panel needs to use two glass substrates, which are used as the bottom glass substrate and the COLOR FILTER substrate.

Can provide large-size LCD screen only the United States Corning, Asasant glass and other four companies, although the glass substrate only accounts for 6%-7% of the cost of TFT-LCD products, but the oligopoly of technology makes the glass substrate products become the leading component products of the upstream materials of TFT-LCD. Domestic Hongcai, Dongxu and other independent TFT-LCD glass projects should be particularly supported and encouraged.

Because the thickness of the glass substrate is very thin, and the control of the thickness size is very strict, generally within a tolerance of 0.01mm, the main accurate measurement of glass thickness, warping and parallelism. The spectral confocal sensor can solve this problem well. Due to the confocal principle, the height and thickness values can be acquired at once. In addition, the simultaneous use of multiple sensors not only improves efficiency, but also avoids secondary damage caused by contact measurements.

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