Tsutomu Tokunaga

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”.