| 摘要 |
PURPOSE:To improve luminance in the inside of a casing and to improve picture quality by using a shielding plate with diffusivity as the shielding part of a shielding plate which covers the outside of the effective screen of a display means. CONSTITUTION:The virtual image of a video displayed on the effective screen 2 by illuminating the effective screen 2 of an LCD unit 1 by a back light 4 and inputting it from a video signal input terminal 14 to the LCD unit 1 is recognized by the human eyes 9 by using an ocular 5. At this time, the shielding plate 30 Is seen as a background with arbitrary luminance for the human eyes 9 by forming the screen limiting window 8 of a translucent and gray shielding plate 30 in the same size as that of the effective screen 2, and illuminating the shielding plate 30 with the light of the back light 4 transmitting a glass substrate 3. Also, the irregular reflection of the light emitted from the effective screen 2 of the LCD unit 1 can be suppressed by applying delustering inner coating to the inside of a black cabinet 6 and the shielding plate 30 and shielding external light, and the luminance of the shielding plate 30 can be set at arbitrary luminance between the maximum and minimum luminance of a video signal waveform. |
