| 摘要 |
PURPOSE:To make the toughness and defect of picture elements in a display body inconspicuous with a simple means by disposing a member forming a phase type grating at the back of a display body having picture element groups. CONSTITUTION:A lighting source 101 irradiates the display body 102. The light transmitting the display body 102 is reflected by a light path bending mirror 103 and comes into an observer 107 through a lens 105. The phase type grating 104 is formed on the surface of the light path bending mirror 103. By the light dividing action of the phase type grating 104, plural duplicated images corresponding to the respective picture elements are obtained. The distance Z between the display body 102 and the grating 104 and the pattern and the sectional shape of the grating 104 are decided so that the duplicated images are just between the picture elements. The distance Z is selected so that the contrast of Moire fringes generated between the picture periodic structure of the display body 102 and the picture periodic structure of the grating 104 is inconspicuous. |
