Shigeru Iwaoka

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.

12.2: Development of 50-in. Diagonal Full HD (1920 × 1080) PDPs

50-inch diagonal Full HD PDPs (1920 × 1080 pixels) have been developed and introduced in the market place. In the development, manufacturing of the fine cell structure has been obtained by the optimization of cell design, materials and process conditions. T & Waffle structure has been employed and shows sufficiently high luminous efficacy. Most important issue of high speed addressing has been solved by CEL structure and its improvement. CEL technology has opened new aspect in higher resolution PDP technology. We expect that it will open new technology area in PDP field.

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”.