Touch Panel Index Matching
Pick the optimal index-matching layer between cover glass and the display panel polariser stack.
Validation: hand-checked example → /validation#touch-panel-match
Computes the geometric-mean RI √(n_top · n_bottom), the quarter-wave thickness λ/(4·n_im), residual Fresnel reflection, and recommends a Kriya family (LRI 1.35, hardcoat baseline, or HRI 1.65/1.70) by RI bucket.