In a Digital Projection there are different techniques with fantastic acronyms. How to turn light into ones and zeros? Now we will shed some light on different systems, and highlight the advantages and disadvantages of digital projection.
Modern technology has given us many Equipments and one of them is Digital projector. A projector is used to transfer image from small screen to large screen with help of a lens. Digital projection enables to visualize the data that is already stored on computer or disc player. Digital projectors are used on a large scale to show presentations in corporate sector. Advertisers also use these projectors to display & define their products. Digital projection is also an important part of home theatre system.
There are 4 techniques used in digital projectors.
Digital Light Processing (DLP)
It controls light by mirror movement. Mirrors are mounted on rocking bar in matrix placement. It reflects light. Digital Light Processing projectors has contrast ratio. 3 chip solution with Red, Green & Blue color is used in cinemas.
Liquid Crystal on Silicon projectors (LCoS)
Display can be switched electrically oriented crystals of different brightness. Depending on the brightness of the projection light is more or less strongly reflected. In this technology visible grid is avoided. Higher light intensity is required on the basis of polarization.
It uses 3 solid state lasers (Red, Green & Blue) that built the same image that we see on TV. The image quality & sharpness reduce with increase in size.
Direct Drive Image Light Amplifier technology (D-ILA)
The light controlled by pixel on an LCD panel is projected reflective. The darker the dot on the LCD, the higher is reflection towards the screen. Contrast level of DLP & D-ILA projectors is similar.
Although the digital projection has achieved its extreme quality & all types of projectors have applied such benefits. As now there is no need of film & we need not carry film everywhere so there is no wear & tear of the film. The image is now free of scratches, dust or any other destruction in film. The quality of film also remains same in relation to how many presentations one made. Digital projectors are sharper, clean and neat with help of 3D technology the display has also improved a lot.
All the products which has been converted from mechanical to digital is that if any problem is their it can be repaired only by a technician. A true comparison of digital and analog projection quality is difficult because contributing factors such as screen size, distance from the screen, contrast, brightness, refresh rate, pixel visibility or color purity to the overall picture. Traditional 35mm film achieves a theoretical resolution of 8K, ie 8192 x 4096 pixels. However, the quality is achieved by the typical characteristics of the film grain and the projection lens, and the wear in about one comparable with 4K projection (see also article on formats). The DCI standard 2K has established itself as the quality of digital projection with the experienced quality of 35mm should be satisfactorily comparable. The biggest disadvantage of digital projection is currently the cost of conversion, which includes the cost of the projector.
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