| 摘要 |
<p>A CRT display device including an envelope having a faceplate of a predetermined light transmissivity, a luminescent screen disposed on an inner surface of the faceplate and electron beam producing means disposed within the envelope for exciting the screen to effect production of a luminescent image, a neutral density transmissivity filter means disposed adjacent an outer surface of the faceplate, wherein for viewing under high ambient light conditions the total transmissivity Tt is 10 % « Tt « 30 %, and during operation of the display device the electron beam producing means produce a beam current density on the screen such that the contrast C4000 is 4 « C4000 « 8.</p> |
