Kyoji Kariya

49.4: A New Driving Technology for PDPs with Cost Effective Sustain Circuit

We propose a new driving technology of PDPs, which enables to decrease the sustain voltage of conventional technology by half without lowering the gas discharge voltage, and also to cut down the number of MOS-FETs. Consequently, the cost of the driver circuit containing sustain circuit, scan driver IC and power supply can be greatly reduced.

High-Resolution Interlaced Addressing for Plasma Displays

A new plasma display technology called ALIS “Alternate Lighting of Surfaces” method which improves the resolution and brightness at the same time has been developed. By using this technology, more than 1000 numbers of scanning lines corresponding to the HDTV broadcasting can be achieved with a number of electrodes which is almost equal to present panel of 480 scanning lines, and also the brightness goes up about 1.5 times. 42 inch prototype panel with the resolution of 1024 1024 realized the brightness of 500cd/m2 and power consumption of 250W.

49.1: Development of a Hi-Definition 32-in. PDP

We developed the worlds smallest 32-inch HDTV PDP. By improving the luminous efficiency, a luminance of 650 cd/m2 and power consumption (discharge and driving circuit) of 200 W or less was achieved. Moreover, incorporating an Advanced Color Compensating (ACC) filter improved the PDPs color reproduction capability, better than that of CRTs.

26.3: Evaluation of Motional Artifacts on PDPs Appearing with Arbitrary Motion of Observation Points

An evaluation technique is introduced for artifacts appearing on PDP images when the eye of an observer does not follow the motion of the images. The motional artifacts are serious especially when the eye moves arbitrarily. Dividing the light-emission periods of sub-fields into smaller blocks, and adding equalizing pulses to the original signal are effective in reducing the disturbances.

ALIS method for high-resolution color PDPs

— This paper describes the Alternate Lighting of Surfaces (ALIS) method as a promising drive technology which can lead to high-resolution plasma-display panels (PDPs). This technology provides a resolution of more than 1000 scanning lines without lowering luminance, thus enabling the essential requirements of HDTV. Moreover, it allows the number of scanning electrodes to be halved in comparison with the conventional method, as well as the circuit scale to be minimized due to the use of the single scanning drive. The ALIS method is expected to be a key technology that will help PDPs penetrate the TV market.

Improving PDP picture quality by means of a motion-dependent equalizing-pulse technique

— When moving images are displayed on color plasma displays, motional artifacts such as dynamic false contours with disturbances of gray scales and colors are often observed. Reduction of the disturbances is essential to achieve PDPs with acceptable picture quality for TV use. The moving-picture quality can be improved to some extent by using an equalizing-pulse technique which augments or suppresses light-emission to compensate for the lack or surplus from the original signal. The disturbances, however, become significant as the speed of motion increases. In order to reduce the disturbances, the equalizing pulses are weighted according to the speed and direction of motion. The improvement can be enhanced further by combining the technique with a modified-binary-coded light-emission-period scheme. Disturbance is thus reduced by 82 dB. The technique is applicable to images moving at any speed in any direction. It can also be used for any pixel arrangement and any light-emission scheme.

A virtual pixel technique for doubling the PDP resolution of moving images

— A virtual pixel technique increases the resolution of spatially discrete pixilated display devices when the eye moves relative to the screen. By using this technique, an effective PDP resolution can be doubled for moving images. For instance, 1280-horizontal-pixel data can be displayed on a VGA PDP having only 640 horizontal pixels. The positions and sizes of the virtual pixels are controlled by choosing light-emission timings and durations of the actual pixels as their images move across the retina.

Development of a high‐definition 32‐in. PDP

We developed the worlds smallest-profile 32-in. HDTV PDP. By improving the luminous efficiency, a luminance of 650 cd/m 2 and power consumption (discharge and driving circuit) of 200 W or less was achieved. Moreover, incorporating an advanced color compensating (ACC) filter improved the PDPs color-reproduction capability, better than that of CRTs.