According to reports, Sony developed a color LCD using a thin film transistor (TFT) method. Traditional LCDs place control circuits on work platforms. Plastic products replace plastic glass plates with glass substrates and are expected to be as soft as paper. The traditional glass LCD has a thickness of 1.4 cm. Sony's test product has a thickness of only 0.4 cm and a weight of only 0.5 g. If it is a 3.8 LCD for mobile phones, the weight of glass products is 20 grams, and that of plastic products is only 3 grams.
When the TFT-type LCD is used to fabricate a polysilicon circuit, it needs to be processed at a high temperature of approximately 400 degrees Celsius, so that it is impossible to use a heat-resistant plastic. Sony has developed a technology that basically forms a circuit after work and moves to a plastic sheet, and it is not necessary to modify the existing production line at a large scale, so it can reduce the initial investment cost.
More and more mobile phones have multiple functions such as sending and receiving e-mails, display time, and so on, and not only one LCD is used. Therefore, weight-reduced plastic LCDs are promising in the future.
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