Digital projectors are generally devices that integrate light sources, optics systems, electronics, and displays for projecting images from computers or video devices onto walls or screens, for large-image viewing. Projectors are utilized in many aspects of modern life. From home theaters to business presentations, projectors are provided to offer a wide range of functionality to consumers. Projectors can be classified into front surface type projectors and rear surface type projectors. In the front surface type projector, a reflective type screen is located on a vertical wall in a room, and the projection system, including display panels and a projection lens, is arranged at the center in the room, whereby the modulated light is projected by the projection lens onto the screen for producing an image thereon. On contrast, in the rear surface type projector, a projection unit including display panels and a projection lens is arranged in the projector casing, and a light transmitting type screen is arranged on the front of the projector casing. Projectors can also be classified into two categories: data projectors and video projectors, depending on their intended use. Data projectors project an image based on image signals received from an information terminal, such as a personal computer. Data projectors are typically used for presentations in well-lighted places where brightness is important for a projected image. On the other hand, video projectors project a screen image of TV or a movie based on screen image signals received from an AV device. Video projectors are typically used for watching a movie in dark places where picture quality including color balance or contrast is more important than brightness. From the viewpoint of the number of light bulbs, projectors are classified into a one-screen type, a two-screen type, and a three-screen type. The light bulbs are classified into a transmission type and a reflection type. Projectors using an LCD (liquid crystal display device), DMD (digital mirror device), or LCOS (liquid crystal on silicon) as a light bulb has been actively developed. The rapid progress of liquid crystal technology and DLP (digital light processing) technology has been accompanied by advances in the development of more compact and more highly functional projectors. Digital mirror device (DMD) projectors, also known as digital light processor (DLP) projectors, direct high intensity light at an image generator having a large number of miniature mirrors that selectively direct the light at a screen to form an image. An LCD projector directs high intensity light through a LCD screen having the desired image which is then projected onto a screen. A LCOS light engine combines LCD panels with a low cost silicon backplane to obtain resolutions that are typically higher than LCD or DLP projectors. The LCOS light engine has a lamp whose light is sent to a prism, polarized, and then sent to a LCOS chip.
Digital projector categories
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