A lens display device is disclosed. The device includes an optical thin film layer, a polarized switch unit, and a display unit emitting light. The optical thin film layer includes a single-refringent film layer, and first and second liquid crystal lens arrays on the single-refringent film layer. The arrays are positioned such that the lens elements of the first array are misaligned from the lens elements of the second array by half of the lens period. The polarized switch unit, when operative, polarizes the light emitting from the display unit into ordinary light entering the first liquid crystal lens array and into unordinary light entering the second liquid crystal lens array. In addition, when inoperative, the polarized switch unit polarizes the light emitting from the display unit into unordinary light entering the first liquid crystal lens array and into ordinary light entering the second liquid crystal lens array.