DLV (DigitalLightValve: digital light path vacuum tube, referred to as digital light valve) is a new technology that combines CRT transmission projection technology and DLP reflection projection technology. The core of this technology is to use a small-diameter CRT as the imaging surface of the projector, and use a xenon lamp as a light source to project the image on the imaging surface to the projection surface.
Therefore, while taking full advantage of the high resolution and adjustability characteristics of the CRT projector, the DLV projector also uses the high brightness and color reproduction characteristics of the xenon lamp light source to illuminate the photoelectric converter through the optical signal output by the CRT, The light signal is converted into a continuously changing electrical signal; the external light source generates a strong light, which is projected onto the light valve, reflected by the internal mirror, and can change its optical characteristics through the light modulator, closely following the polarization filter of the light valve, The light in other directions will be filtered out, and only the light in the same direction as its optical gap will be allowed to pass. This light is combined with the CRT signal and projected onto the screen. Therefore, the DLV projector is not only a projector with high resolution, contrast, and color saturation, but also a projector with high brightness. Its resolution generally reaches 1250 × 1024, and the highest can reach 2500 × 2000. The contrast ratio is generally above 250: 1, and the number of colors is generally 16.7 million with 24 bits.
DLV projection technology is suitable for occasions with strong ambient light and large audiences, such as ultra-large-scale command centers, conference centers and large entertainment venues, but its high price and large size make it difficult to repair the light valve. For users who pursue high resolution, high brightness and large screen, light valve projector is their first choice. The TalaliaMLV-HDTV system developed by General Electric Company (GE) of the United States is a projection system that is more efficiently applied to HDTV. The progress of the light valve technology applied to HDTV depends on the development of light control materials and technology and integrated electronic drive circuits for addressing pixels. (Organized by China Educational Equipment Purchasing Network)
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