Projector spot tries machine skill
After definite place chooses model, the spot imposes electric requirement, how distinguish the real target of projector through what delivering a picture?
1, examination level scanning dogs frequency limits
According to the limits of horizontal scanning frequency that gives out on technical index, choose from which tall, medium, low 3 frequency, computation gives 3 frequency to nod the picture resolution that answers relatively. Examination projector falls in these 3 resolution, whether can show normally. If give appearance of active and different situation, namely picture twist or shake etc, demonstrative level scanning dogs undesirable.
2, examination focusing function
Check pane with what projector interior arises, or the test pane that signal generator, computer produces, move focusing to optimal position, image contrast by low to tall change, whether do the standard that observes pane and plumb lines have medicinal powder anxious phenomenon. If have, explain focusing performance is bad.
3, examination video bandwidth
Video bandwidth affects the detail part of video directly. The signal of form of white base map of the highest resolution that with the computer or signal generator generation a projector can reach, the graph of the smallest character on act of film viewing screen is clear. When the video bandwidth that is like projector is insufficient, the place on screen shows horizontal line solidder, and perpendicular line sends empty, image detail is punch-drunk.
The spot examination of LCD projector makes a completely white picture, observation color uniformity how. Generally speaking, uniformity of color of liquid crystal agreeable is very inaccessible higher level. But the projector color uniformity with good quality is relatively better.
4, dustproof function
Additional, of liquid crystal projector dustproof it is a difficult problem, a very small dirt, if fall,arrive on liquid crystal board or lens, be magnified possibly very clearly. On completely white picture, by small rectify optical focusing to major key, point out like splash having variety on act of film viewing screen now, may be fall on liquid crystal board or lens have dirt, the dustproof system that estimates a machine has a problem.
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