Computation of minimal RGB LED backlight intensity for RGBW LCD displays

In the article we address the problem of RGB LED backlight power minimization in RGBW LCD displays. The problem is formalized as the determination of the minimal LEDs currents (and/or duty cycle) that allows the picture content rendering without clipping artifacts. We will write this problem in mathematical language and show that it has a unique solution. Then we propose an efficient algorithm that finds the minimal LEDs drive values according to the input content. The algorithm is stable and relatively simple. It gives temporally consistent solutions and converges to the minimal gamut in two-three iterations. When used in an RGBW display the method significantly reduces power consumption without clipping in the content.