The iterant strong sustain discharge that occurs during a sustain period over a few minutes causes image sticking, which means a ghost image remains in the subsequent image when the previous image was continuously displayed over a few minutes. Accordingly, this paper investigates whether the dominant factor in image sticking is the MgO surface or phosphor layer by testing the effects of image sticking in subsequent dark and bright images using a 42-in plasma display panel. When the subsequent image was dark, the image sticking was found to produce a brighter ghost image than the background. Thus, since the luminance of a dark image is produced by the weak discharge that occurs during the reset-period, the higher luminance of the ghost image was mainly due to the activation of the MgO surface. Conversely, when the subsequent image was bright, the image sticking was found to produce a darker ghost image than the background. Thus, since the luminance of a bright image is predominantly produced by the strong discharge that occurs during the sustain period, the lower luminance of the ghost image was mainly due to the deterioration of the phosphor layer.
The effects of a short time (within 5 minutes) image sticking on the subsequent dark or bright background images are investigated in the 42‐inch PDP‐TV. In the dark background image displayed by only the reset waveform, the luminance from the cells with an image sticking is observed to be higher than the luminance from the cells with no image sticking. On the other hand, in the bright background image displayed by the sustain waveforms including the reset and address waveforms, the luminance from the cells with an image sticking is observed to be lower than the luminance from the cells with no image sticking. It is concluded that the dark image degradation is caused by the activated MgO surface of the cells with an image sticking, whereas the bright image degradation is caused by the deterioration of the phosphor layers.
The new facing reset discharge waveform is designed and proposed to reduce a dark image sticking in AC‐PDP. In particular, the influences of two types of reset discharge (surface reset and facing reset discharges) on dark image sticking are investigated intensively. It is observed that the dark image sticking is reduced considerably when a reset discharge is produced between the scan and address electrodes instead of between the scan and sustain electrodes during a reset‐period.
The temperature-dependent characteristics of temporal image sticking, especially temporal dark boundary image sticking is investigated by observing the IR emission characteristics with respective to the cell temperature rise during the reset-period in 42 inch AC-PDP. The cell temperature rise in the adjacent cells is induced by that in the discharge cells (i.e., image sticking cells) due to the iterant strong sustain discharge, thus resulting in lowering the firing voltage for both the adjacent and discharge cells during the ramp-up period. However, since the phosphor layers are deteriorated due to the strong discharge in the discharge cells, the cells adjacent to the image sticking cells show the highest luminance under the dark background image displayed only by the reset waveform.
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