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

Abstract

Abstract— 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.

Sustain and Address Discharge Characteristics of AC-PDP with MgO Surface Coated by MgO Nano Crystal Powders

“…Recently, in order to compensate the demerit of the conventional MgO layer, various types of MgO crystal powders were used as a functional layer for improving the address delay characteristics and simultaneously lowering the firing voltage in the mini-test panel. [3][4][5][6][7] However, in this case, the partial addition of the MgO crystal powders, particularly the few percent spray-coated MgO crystal powders, might cause a misfiring discharge because the partial addition of the MgO crystal powders might not guarantee the uniform discharge of the entire PDP panel, especially the large size (> 42-inch) panel. Accordingly, the effects of the partial addition of MgO nano crystal powders on the discharge uniformity need to be investigated under the large size PDP condition.…”

Very‐sensitive direct measurement of plasma‐display exoemission

“…Ideally, the intensity of the reset discharges can be carefully adjusted to excite enough exoemission for reliable high-speed addressing and at the same time generate only low levels of background glow necessary for high dark-room contrast ratios. 7,8 There are two fundamental ways to measure exoemission. The indirect method measures the statistical delay of an isolated single pixel address discharge with a sensitive photodetector such as a photomultiplier.…”