Patent ID: 7190416

Claim:
A touchscreen display comprising a transparent touch panel and a liquid crystal display wherein the liquid crystal display comprises a front panel with functional layers, including at least one internal front polarizer, a liquid crystal layer, and a rear panel containing functional layers, wherein the transparent touch panel is secured directly onto the outer surface of the front panel, and the front panel includes a single substrate and said internal front polarizer is placed between said single substrate and said liquid crystal layer; wherein the liquid crystal is a supertwisted nematic and the functional layers of the rear panel include a polarizer, the transmission axis of the front polarizer is oriented at an angle of 45.0±2.5° relative to the director of liquid crystal molecules in the layer adjacent to the front polarizer surface, the transmission axis of the rear polarizer is at an angle of 60.0±5.0° to that of the front polarizer, and the twist angle of the liquid crystal is 240–250°, and the birefringence of the liquid crystal amounts to 820–860 nm; and a compensating optical retardation film with an optical path length difference of 570.0±10.0 nm is located in front of the rear polarizer at an angle of 40.0±5.0° from the transmission axis of the rear polarizer; said front polarizer possess neutral absorption spectrum with a transmission of 25–35% in the entire visible range and exhibits uniform loss over virtually all direction and provides a contrast ratio of 40–50 in the interval of azimuthal angles from 0 to 60 degrees.