The goal of this study is to clarify the realistic viewing conditions and video signal characteristics surrounding flat panel display television (TV), as flat panel display television is becoming increasingly popular. We have conducted an investigation of TV viewing conditions in the home and the statistical characteristics of TV broadcast signals. Our study of viewing conditions indicates that the viewing environment at home is at minimum 3 times of the absolute display height with an average 2.5 m viewing distance, a less than AE45 TV viewing angle, and a 100 -300 lx mean screen illuminance. Our analysis of the broadcast signal indicates that the velocity for the motion of a picture of a general TV program is distributed below 20 /s, visible camera blur is seen when the motion speed is higher than 10 /s, and average signal levels of TV broadcast in Japan are at 40 and 25% for ASL and ALL levels, respectively.
We clarified how wide the gamut of subjects intended to be reproduced on a display are, and what kind of characteristics the BT.709 display has. First we revealed the theoretical limit of real object colors (surface‐colors) with pseudo optimal color, and the gamut of real object colors referred SOCS. Then we revealed the characteristics of the BT.709 display gamut from comparison between BT.709 display gamut and TV color signal distribution which was measured. Then we estimated a probability distribution of real object colors, and suggested a display color design strategy with this knowledge.
A 17-in. video rate full color Ferroelectric Liquid Crystal Display (FLCD) with 720•~916 dots, using r-Vmin mode was developed. The full color moving images with 256 gray levels for each color was displayed by the digital gray scale method combining 2 bits spatial dither and 4 bits temporal dither. The response speed of FLC material is very fast (12 ps/line) and the 4 bits temporal dither with video rate scanning was realized. The FLCD shows a contrast ratio of 60 : 1, a wide viewing angle due to the in-plane switching, and strong shock stability (20 kg/cm2) due to the spacer walls structure. This paper presents a high potential of FLCD for the large-size direct-view video-rate full-color simple-passive-matrix flat panel display.
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