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Digital-To-Analog Converter for LCD Polarization

IP.com Disclosure Number: IPCOM000038678D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31

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Cukier, M [+details]


A drawback of the liquid crystal device (LCD) displays is the small viewing angle. To be read by the operator, the LCD screen must be properly oriented. The viewing angle can be changed by adjusting a dedicated input voltage. With a system such as a modem provided with a keyboard and a non- volatile memory, the operator can enter into memory the information like a word representing the desired polarization voltage. Thus, the operator can adjust this voltage for maximum visual confort. The object of this invention is to provide a digital-to-analog converter to convert the word entered by the operator at the keyboard into a polarization voltage. Digital-To-Analog Converter As shown in Fig. 1, the digital-to-analog converter consists of a Polynomial Counter, a Combinatorial decoder and an RC integrator.