In a multi-gap semi-transmissive liquid crystal display device, the width of a black matrix is made larger above the region between adjacent ITO transparent electrodes and is made smaller above the region between adjacent Al reflective electrodes. The surgical device further includes a cutting head assembly structured to be guided and driven over an upper surface of the positioning ring in a generally arcuate path, and having a cutting element positioned therein and structured to oscillate laterally to facilitate smooth and effective cutting of the cornea. The dry tensile strength of the projecting folded over tail tab exceeds 400 gin and the caliper thereof exceeds one mil The adhesive bonds are spaced away from lines of perforation joining sheets in the initial sheets of the roll.