Projector choose and buy reachs waterproof goods jewel

Umbriferous system design and application are to involve engineering of projector function, screen function, human body, optical, construction the systematic project of the much door course such as the building, of all respects supplement each other, ability is obtained finally show goodly and view the result. Projector choose and buy can be divided again for two respects.
The choose and buy of projector
1. should be wanted clearly to show the nature that believes a source above all
Namely how much is its line frequency, show calorie of output by assorted one. Show the nature of the source according to place, projector basically can be divided for common video machine, number machine 2 kinds. When showing composite signal only, if block the hall that pull OK to broadcast video tape, can select common video engine; Want to show VGA blocks the signal of output, can use choice number machine; And all NEC model have both video and number are defeated by a mouth.
2. confirms installation pattern
Cent of projector installation means is being cast for desk type, condole top is being cast, desk type back is cast, condole top back is cast. Be being cast is projector and audience in a side; The back is cast is projector and audience are in respectively screen two end. If be used temporarily, condole of type of optional choose desk carries means on the head. If the space is larger, earth is built arrange as a whole from time to tome, choice back projects means whole result best, if the space is lesser, optional choose carries the means that sends reflection on the back.
3. makes clear indication environment, be like circumstance of room size, illume
If room area is lesser, projector of optional liquid crystal. Should show the area is larger, without solar illuminate, floodlight light is darker, optional choose low brightness makes an appointment with 800-1200ANSI projector. Should ask to ambient light not tall, indication area is especially big, show signal of high resolution graph, can choose LCD projector.
Skill of 4. spot choose and buy
After definite place chooses model, the spot imposes electric requirement, how distinguish the real target of projector through what delivering a picture?
Examination level scanning dogs the limits of horizontal scanning frequency that frequency limits basis 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.
Examination focusing function uses the test check that projector interior produces, 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.
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