Hanchun Yin

19.4: A Novel AC PDP with Shadow Mask

A newly developed AC PDP with shadow mask (SM-PDP) is presented in this paper. Using shadow mask made of invar will cut down the manufacture cost of PDP and improve the performance instead of normal rib walls made of dielectric materials significantly. A 14″ monochromatic SM-PDP (240×200) and a 14″ color SM-PDP (80×RGB×200) have been made and video display have been realized.

11.4: A Novel Shadow Mask PDP with High Luminance and Contrast

An improved AC PDP with shadow mask SMPDP is presented in this paper. The manufacture cost of SMPDP can be reduced significantly by replacing the normal dielectric rib with shadow mask. A 14″ full color SM-PDP 240×RGB×180 prototype TV set has been made. High luminance with 550cd/m2 and high contrast over 5000:1 have been achieved by applying high Xe content and True Black driving scheme.

P‐37: Just Noticeable Difference of Image Attributes for Natural Images

To model the relative importance of the image quality attributes white level, black level, color saturation and contour rendering, they need to be varied all to a perceptually equal extent. The just noticeable difference (JND) of each attribute can be used for this. These JNDs are well known for specific test patterns, but not for natural image content. In this paper, we describe several experiments to determine the relationship between the JNDs and the averaged image characteristics.

31.3: Perceptually Relevant Characterization of LCD Viewing Angle

In this paper we propose a perceptually relevant way to define the viewing angle of LCD displays. Visibility and acceptability thresholds were determined in a perception experiment; the display was physically characterized at the obtained threshold angles. The relation between perception and physical parameters was established with regression analysis.

P-54: Three-Dimensional Investigation of a Novel Plasma Display Panel with Metal Barrier Plate

The discharge characteristic of a novel color plasma display panel with metal barrier plate (SM-PDP) has been studied by 3D simulation. Compared with the conventional coplanar PDP (ACC PDP), the novel structure has advantages of lower cost, lower ignition voltage, higher response frequency and higher brightness substantially. The luminous effiacy of the SM-PDP experimental panel with novel structure is about 0.8–0.9lm/W without energy recovery circuit.

Two-dimensional simulation of the effects of the driving waveforms on the shadow mask PDP cell discharge

A new type of ac plasma display panel (PDP) with shadow mask (SM-PDP) is presented for its effective structures with lower cost. A two-dimensional self-consistent fluid model is used to analyse the discharge characteristics of the SM-PDP cell in a simplified driving scheme. The effects of the addressing time, the sustaining frequency, the duty ratio of the sustain voltage and the rise time of the voltage pulse on the discharge efficiency are investigated in this paper. The simulation results can help us optimize the driving scheme of SM-PDP.

Investigation of breakdown characteristic of a novel plasma display panel discharge cell with rotationally symmetric structure

Breakdown characteristic of a novel plasma display panel discharge cell with rotationally symmetric structure has been investigated by simulation. The corresponding formulas are given in this article. The electric field and particle density distribution are obtained from the simulation at different times, as well as the variation of average density of particles. The simulation results show that our novel structure has many advantages, such as lower ignition voltage, lower power consumption, higher luminous efficiency, and enhanced response frequency. Without application of energy recovery circuit a luminous efficacy of 0.8–0.9 lm/w is obtained.

Just noticeable difference in black level, white level and chroma for natural images measured in two different countries

The just noticeable difference (JND) in black level (BL), white level (WL), and chroma as visible in natural images under practical viewing conditions is determined. The same experiments are conducted in China and in the Netherlands to evaluate possible ethnic differences in the size of JNDs. In both countries, there is a strong effect of image content on the JND of BL and WL, while for most images used in this experiment no content dependency is found for the JND of CS. For most images, there is no difference in JND of WL and CS between China and the Netherlands. For some images, we found a difference in JND of BL between China and the Netherlands, but this difference most probably is related to the fact that the viewers looked to a different part in the image, rather than to an ethnic difference.

Effect of experimental methodology on the JND of the black level for natural images

The effect of experimental methodology on the Just Noticeable Difference (JND) of the black level (BL) is assessed using a set of representative natural images. Two methodologies, known in psychophysics to determine JNDs, are mutually compared: an adapted method of adjustment with a same-difference task and a one-up-two-down staircase method with a two-alternative forced-choice task. Thus far, the literature has shown contradictory results for which of the two methods yields the lower difference thresholds. Experimental results show that the second method yields lower JNDs, but is slightly less efficient. Based on this second method, it was found that the JND of the BL for natural images ranges from 0.2 to 1.0 cd/m2, varying with image content significantly.

Numerical study of the electron and ion trajectories in HOPFEDs

A hopping-electron field-emission display (HOPFED) is a field-emission display (FED) with a new and revolutionary spacer structure. In a HOPFED, two insulator plates, referred to as hop and flu spacers, are sandwiched between the emitter and front plate. The objective of this spacer structure is to improve the performance of a FED substantially, notably contrast, color purity, and luminance uniformity. Another advantage is the reduced sensitivity of ion bombardment on the field emitters. We show by numerical methods that both the luminance uniformity and the sensitivity of ion bombardment improve substantially in a HOPFED.