Abstract
It is found that panel temperature plays an important role in both background image sticking and white image sticking formation. Experiments which change the panel temperature by either direct way, i.e., use fans to take off heat, or indirect way, i.e., change cell temperature by varying sustain voltage or grayscale level, are designed to investigate the temperature dependency of image sticking formation. Mechanisms are proposed to explain the formation mechanism of both background image sticking and white image sticking. The higher temperature in the image sticking cells may cause temporal increase of secondary electron coefficient of MgO and thus results in lower firing voltage which enhance the discharge intensity and produce the background image sticking. This is verified by experiment and simulation in this research. However, from the production mechanism of secondary electron point of view, the secondary electron coefficient seems not be affected by the temperature. Another possible mechanism of background image sticking formation is that the gas density may be decreased at the higher temperature region. Lower gas density may results in higher electron temperature because the mean free paths of electrons are longer. This could also increase the discharge current and lowered firing voltage. This is also verified by simulation in latter paragraph. Higher temperature may also decrease the phosphor efficiency and cause the decrease of cell luminance thus results in white image sticking. It is concluded that the decrease of phosphor efficiency is possibly caused by the “temperature quenching” mechanism of phosphor emission. This is verified by experiment curve found in a phosphor data book. However, the detail conditions and phosphor efficiency behavior affected by the thermal quenching effect of most of the VUV phosphor needs further exploration. Correlation between panel temperature, degree of image sticking and panel luminous efficiency is discussed. The results show that there is no obvious connection between panel luminance and panel temperature.