Universal overdrive technology for all types of liquid-crystal displays

Abstract

We propose a new overdrive technology using third-order approximations. We can estimate overdrive (OD) values for all the transitions by linearly shifting a third-order base line. We investigate whether the proposed method is applicable to any liquid-crystal display (LCD) panels regardless of their characteristics. We examine the feasibility of the method using 11 LCD panels with different sizes, switching speed of liquid-crystal (LC) molecules, LC modes, and applications. After confirming the feasibility, we examine optimum position of the base line to minimize OD deviations from optimum OD values. We have four unknown coefficients of the third-order base line and a shifting parameter. We investigate if we can adjust only one coefficient with the three remaining coefficients fixed to create a base line optimized to each panel among the 11. We decide that we can adjust only one coefficient after analyzing experimental results. In addition, we look into fixing the shifting parameter. Finally, we conclude that we can accurately estimate OD values of all the transitions by adjusting only one value. Because of the extreme simplicity, we can implement our OD technology with an extremely simple circuit. We anticipate that common users can easily optimize the visual performance of their LCD system.