A design scheme for sampling switch in active matrix LCD

In the design of a source driver in an active matrix LCD, of primal importance is the issue of how to restrict the admissible allowance of the RPV (i.e. the ratio of the pixel voltage to the video voltage) of a pixel within a specified narrow range, which determines the transmitted luminance of the pixel. This constraint on the RPV is analyzed in terms of parameters associated with the sampling switch and the sampling pulse, and then by using a minimal number of these parameters, a design scheme is described dedicatedly for the sampling switch. Experimental results show that an optimal sampling switch can be attained by the proposed scheme, which gives rise to a source driver with almost 50% less power consumption than the one by manual design.