Kuninori Matsumi

A fully digital convergence system for projection TV

A high-precision fully digital convergence system for home-use PTVs (projection televisions) has been developed. The use of digital circuits and the curved-line interpolation technique can reduce the misconvergence to less than 2 mm (it is 4-6 mm in the conventional system). The use of time-division processing in the digital-to-analog converter and the newly developed gate array realizes a low-cost system and reduces the number of variable resistors to 6 (there are 30-45 in a conventional system). The system can handle nonstandard signals reproduced from VCRs, and can also be applied to EDTV, HDTV, and so on. >

A 46‐in. high‐resolution rear‐projection display

— We have developed a 46-in. high-resolution high-luminance compact rear-projection display that can automatically display in three modes: ID (NTSC), ID-vista (NTSC), and HD. The main specifications of the display are 800 TV lines of horizontal resolution (aspect ratio 16:9), peak luminance of 1370 cd/m2, 100:1 contrast ratio, and depth of 672 mm. We report on the technology required to realize this high performance.

11.3: A 61-inch High Definition Projection TV for ATSC standard

A 61-inch, high definition projection TV having a large neck 36.5mm neck diameter CRT and ATSC 18 format digital decoder has been developed. The large neck CRT is driven by a highly stabilized deflection circuit and 30MHz wide band video drive circuit. This HDTV enables excellent image quality for ATSC HD signal sources. The specifications of the display are horizontal 900TV line resolution, 550Cd/m2 peak brightness and contrast ratio 100. We report on the technology to realize these high performance features.