日本免费A片一区二区三区四区

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      Two important indicators of the screen:
      ?Published: 2012.11.01 ??Views:1121Secondary
      Gain: light standard magnesia completely diffusion curtain luminance ratio under the same conditions, the larger value represents the higher the gain, the smaller the contrary.
      Perspective: divided into a maximum angle of view and the best view of two.
      Top Angle: clear view of the scope of the contents of the screen, light vertical according to the gain at the center of the screen as the peak gain, when the person is moved around by the center of the screen, the image brightness will be reduced when the gain falls peak half of this angle. for the best viewing angle, also known as the half-value perspective.
      Maximum angle of view: the angle normally see in the image on the screen.

       

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      日本免费A片一区二区三区四区