Abstract— The focusing characteristics of a 6.9‐in. projection CRT with a combined electromagnetic and electrostatic focusing system were improved for an HDTV‐display application. To improve the focusing characteristics, a new densely packed phosphor screen with reduced spot growth due to light scattering within the phosphor screen was developed, together with an optimally designed unipotential focusing (UPF) electron gun. Furthermore, a new green phosphor was used to improve the luminance. As a result, beam spot diameters of 0.15 and 0.35 mm were achieved at cathode currents of 0.5 and 5 mA, respectively, with a luminance of 1.3 × 105 cd/m2 at a cathode current of 5.0 mA. An experimental 46‐in. TV set using this projection CRT achieved 900‐TV‐lines horizontal resolution and 1500‐cd/m2 peak luminance. In summary, this projection CRT improves the state of the art of HDTV displays.

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Abstract— 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.

A Superniniaturi zed double-balanced mixermodulator(D8H) by t h i c k film technology has been developed,in which a couple of phase transformers w i t h t h i c k f i l m conductor and d i e l e c t r i c m a t e r i a l s a r e connected t o a quad-diode chip.0ptimization o f the width o f a thick f i l m coi1,the dielectric constant and thickness o f d i e i e c t r i c layers between the c o i l s made DBMs t o work a t 0.9.1.5 and 1.9GHz band respectively.

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