| 摘要 |
A method for making a direction sensitive contrast enhancement filter for a shadow mask color cathode ray tube is disclosed to minimize the amplitude of moire interference patterns to unnoticeable or unobjectionable levels. For a particular color cathode ray tube phosphor dot size, the light transmission through a direction sensitive enhancement filter having a given hole size and spacing is determined mathematically. The filter is then moved a number of fixed increments with respect to the phosphor dot and the light transmission is determined for each incremented position. The variation in light transmission as the filter is moved incrementally across the phosphor dot is the data recorded. This procedure is repeated for different hole sizes and different hole spacings and the data graphed to find the minimum light transmission variation. At this minimum light transmission variation moire patterns are reduced to unnoticeable or unobjectional levels. A selected planar material then has holes or optically clear channels of the selected radius and spacing placed therethrough to make the filter. |
