Parallax barrier, multiple display device and parallax barrier manufacturing method

A multiple display device comprising:

• a matrix-type image-producing device arranged to generate a display image;
• and
• a parallax barrier attached with the matrix-type image-producing device arranged to permit different images to be displayed respectively to different display directions of the matrix-type image-producing device;
• wherein
• the parallax barrier includes a light blocking layer on a transparent substrate, the light-blocking layer having a repeated pattern of pitches, some of the pitches being different from other pitches, and an average pitch distance of which is different from a pixel pitch distance of the matrix-type image-producing device.

A method of manufacturing a parallax barrier for use in combination with a display panel and for permitting different images to be displayed respectively to different display directions of the display panel, the method comprising the steps of:

• forming a light-blocking layer on a transparent substrate, the light-blocking layer having a repeated pattern;
• wherein
• the step of forming the light-blocking layer includes performing photolithography to pattern a metal layer or a resin layer formed on the transparent substrate;
• and
• the step of performing the photolithography includes using a mask having a repeated pattern of slits arranged at pitches, some of the pitches being different from other pitches, the slits corresponding to portions where the light-blocking layer is to be formed.