The recent proliferation of liquid crystal (LC) displays in automotive applications - head-up displays, meter displays, navigation systems and entertainment displays. However, today's liquid crystal display technology remains challenged in extremely cold and extremely hot weather, and extreme temperatures can result in blurred images and slow display.
Professor Wu Shicong, from the University of Florida's School of Optics and Photonics, and colleagues from Central University of Florida, Xi'an Institute of Modern Chemistry and Japan's DIC Corporation, have developed three new LC blends that overcome the need for higher and lower operating temperatures Physical limitations.
Professor Wu said LC should have a clearing point above 100 ° C and a melting point below -40 ° C beyond which LC will not work because of freezing or isotropy.
Low viscosity at low temperature
For their LC to work over a wide temperature range, the researchers mixed twelve tricyclic and tetracyclic compounds with low molecular weight compounds. This type of mixture is called a eutectic system. In addition to having a higher clearing point, the mixture also has a lower viscoelastic coefficient and activation energy. These features enable the LC to maintain a lower viscosity at lower temperatures, whereas the response time of liquid crystal displays is mainly affected by the thickness of the liquid crystal layer and the viscoelastic coefficient.
Current European automotive standards require pixel response times varying from one brightness to another at 200 milliseconds (-20 ° C) and 300 milliseconds (-30 ° C) to avoid image blurring. The reaction time of Wu and his colleagues is about 10 milliseconds, which is about 20 times the speed of Europe. In addition, these blends enable field color display at higher temperatures with triple density resolution and display brightness. This method improves the environmental contrast of the head-up display during the daytime.
Future work by Wu and colleagues includes the development of the integration of ultra-thin LCDs and rear-view mirrors to eliminate drivers' blind spots and improve the readability of all types of automotive displays in dazzling conditions.
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