Nobuhiko Saegusa

35.1: Invited Paper: A 50‐in. Diagonal Plasma Display Panel with High Luminous Efficiency and High Display Quality

Higher Xe content gas has been applied to an improved cell design using “T”-shaped electrode and deep WAFFLE rib. Newly developed 50-in. diagonal wide/XGA panels have a luminous efficacy, a panel luminance and a panel full screen white luminance of 1.8 lm/W, 900 cd/m2 and 200 cd/m2 respectively. The power consumption of the new 50-in. display monitor is 348W. The image qualities, other than luminance, have been also improved by “smooth CREAR” driving method and “pure” color filter. The driving method reproduces 768 gray levels and the gradation on low luminance region is as smooth as 4000-step gray levels. Color gamut reproducing full NTSC area and a bright-room contrast ratio of 120:1 under ambient illumination on the screen of 150 lx have been obtained by the color filter. After all the newly developed plasma displays (PDPs here after) show high display quality and the total display performance of them, as a large-screen TV, excels that of any other display device.

High‐contrast driving method for advanced CEL structure with magnesium oxide single‐crystal powder in ACPDP

— A new driving method for an advanced-CEL-structure panel has been developed. Picture qualities have been upgraded. Discharge time lags are drastically shortened by priming electron emission from magnesium oxide (MgO) single-crystal powder, refered to as a crystal emissive layer (CEL). The advanced-CEL-structure panel has CEL material on the surface of not only the surface-discharge-electrode side but also on the address-electrode side. This panel structure enables a stable opposed discharge when the address electrode functions as a cathode. By utilizing the opposed discharges in the reset and LSB-SF sustain periods, the dark-room contrast ratio has been drastically increased to over 20,000:1, which is higher than five times that of the conventional method, and the luminance of the least-significant-bit sub-field (LSB-SF) is as low as 0.1 cd/m2, which is one-fourth that of the conventional method. The high-picture-quality PDP TVs refered to as “KURO” that employs these technologies have been introduced into the marketplace.

21.2: Very High Contrast PDP Driving Method on Advanced CEL Cell Panel

A newly developed driving waveform for the advanced Crystal Emissive Layer (CEL) structure panel employs opposed discharges both on reset and LSB-SF. The darkroom contrast ratio has been improved over 20000:1 and gradation luminance minimum step has been reduced to 1/4 of conventional PDPs by the reduction of LSB-SF luminance in the new PDP “KURO”.

New high-luminance 50- and 43-in. ACPDPs with an improved panel structure

— New 50- and 43-in. ACPDPs, which have been developed and commercialized in 2001, show high luminance with improved cell structure and higher Xe-content gas. The specific features of the cell structure are “T”-shaped electrodes and waffle-structured ribs, which are same as those of the previous model. Both the cell structure and gas conditions have been optimized. New green and blue phosphors have also been adopted. As a result, the luminous efficacy has been improved up to 1.8 lm/W by using a black stripe. The peak luminance of the 50- and 43-in. PDPs have reached 900 and 1000 cd/m2, respectively, while the power consumption of the 50-in. PDP has been decreased to 380 W, which is 20% lower than that of our previous 50-in. PDP.