DEVICE TO DISPLAY VISUAL INFORMATION Russian patent published in 2004 - IPC

FIELD: information displaying equipment. SUBSTANCE: device to display visual information includes cathode-ray tube and projection lens incorporating seven elements. Trapezoidal prism is located between cathode-ray tube and projection lens with input face of prism oriented at acute angle with screen of cathode-ray tube. First element of projection lens comes in the form of inclined positive meniscus facing cathode-ray tube with concavity. Second element is biconvex, linearly decentralized and faces cathode-ray tube with more convex surface. Third element is plane-convex, cylindrical and faces cathode-ray tube with convex surface. Fourth element presents positive meniscus facing cathode-ray tube with convex surface. Fifth element is negative meniscus facing cathode-ray tube with concavity. Sixth element comes in the form of positive meniscus facing cathode-ray tube with concave surface. Seventh element is biconvex. EFFECT: enhanced quality of display of information picture thanks to compensation for distortions introduced by hologram optical elements. 1 dwg