Lanlan Yang

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.

Design of a multiplexing grating for color holographic waveguide

Abstract. Volume holographic gratings have been used in waveguide displays to implement full-color three-dimensional imaging. Among these, multiplexing gratings are advanced in low energy losses and simple manufacture technologies when used as couplers of color hologram waveguides. A multiplexing holographic grating is designed to realize a uniform red, green, and blue diffraction efficiency and eliminate stray light to the largest extent. Results indicate that the red, green, and blue light incident normal to the grating could be successfully in-coupled into the planar waveguide for total internal reflection with high peak diffraction efficiency, similar energy output, and little stray light. We also analyze the effect of the technical tolerance, including gating thickness, index modulation, grating period, slanted angle, and incident angle. This analysis could help to minimize the optical system and improve the color image quality of waveguide displays.

Effects of ramp reset pulses on the address discharge in a shadow mask plasma display panel

A two-dimensional self-consistent numerical simulation model is used to analyse the effects of the ramp reset pulses on the address discharge in a shadow mask plasma display panel (SM-PDP). Some basic parameters such as the slope of the ramp pulse and the terminal voltage of the ramp reset period are varied to investigate their effects. The simulation results illustrate that the wall voltage is mainly decided by the terminal voltage and the firing voltage at the end of the ramp reset period. Moreover, the variation of the ramp slope will also bring a few modifications to the wall voltage. The priming particles in the beginning of the addressing period are related to the slope of the ramping down voltage pulse. The simulation results can help us optimize the driving scheme of the SM-PDP.

Design of a double grating-coupled surface plasmon color filter

Surface plasmon-based nanophotonic devices are advanced in high-sensitivity of wavelength, which can be used to fabricate narrow band color filters. But when SP is excited by grating-coupled structure, the evanescent wave is limited on the interface of metal and dielectric. We design a tunable transmissive filter, consisting of two same sinusoids metal gratings with corresponding substrates and a modulation layer. Herein the dielectric medium is used as the modulation layer and is sandwiched between two metallic gratings. The two metallic gratings are symmetric. If the incident TM wave satisfies the momentum matching condition, the SP excitation at the first metal-dielectric interface will arouse the SP excitation with the same frequency on the second metal-dielectric interface. Then waves with a certain spectrum bandwidth transmit to the far field. The way to tune the selected wavelength is changing the grating period and the distance between two metal gratings in the range of SP penetrating depth. We analyze the influence of the structure profile on the wavelength selectivity. Results show that this novel color filter can realize a continuous shift of transmission peak in the visible range. The transmissivity is higher than 60%. It can be applied to the high resolution display devices to improve the quality of color images.

Holographic waveguide display with a combined-grating in-coupler

Volume holographic gratings are widely used as couplers in eyewear waveguide display systems, but they show a relative lower TM polarized energy compared to transverse-electric (TE) incidence. In this paper, we propose a novel holographic waveguide display system with a combined-grating as the in-coupler. When used as an in-coupler for a holographic waveguide display system, a subwavelength metal grating is designed onto the volume holographic grating to increase the total diffraction efficiency of the coupling gratings. Theoretical calculations show that this design increases the diffraction efficiency by 16.4% for TM polarization, 4.3% for TE mode, and 10.0% for unpolarized light, compared to a single volume holographic grating. Calculations also show that the use of this design as an in-coupler for a holographic waveguide system increases the luminance efficiency for these three modes by 26.8%, 9.0%, and 15.6%, respectively.

Discharge efficiency of a 25‐in. high‐resolution SMPDP

— A novel round subpixel and triangle-arrangement shadow-mask plasma-display panel (SMPDP) suitable for high-resolution displays has been investigated. The discharge efficiency of this high-resolution SMPDP and the AC coplanar PDP (ACCPDP) has been calculated separately. The variance of the discharge efficiency with pressure and xenon content will be reported. Results indicate that the SMPDP can reach a higher efficiency for high-resolution displays than conventional ACCPDPs.

The impact of ambient illumination on visual fatigue while watching TV

The impact of ambient illumination on visual fatigue while watching TV was investigated. The tested ambient illumination included 120Hz full modulated LED light source, normal fluorescent light source and dark environment. Visual fatigue was measured with subjective ratings (12 symptoms, considering general discomfort and eye fatigue) and ophthalmological parameters (CFF, NRA, PRA, NPA, NPC) both before and after watching television. Results showed that, generally, both subjective ratings and ophthalmological parameters indicated significant visual fatigue after watching TV. However, only subjective ratings reflected more visual fatigue under dark environment compared to the illuminated environment. The difference between LEDs and fluorescent lamps was not significant.

Effects of shadow-mask voltage on the discharge in shadow-mask PDPs

— A new type of ACPDP with a shadow mask (shadow-mask PDP, SMPDP) has been developed, featuring an effective structure and lower cost. The distinct difference between an SMPDP and a conventional ACPDP is that the dielectric barrier ribs are replaced by a single metal shadow mask. A three-dimensional self-consistent fluid model was used to analyze the effects of the shadow-mask voltage on the discharge for a simplified driving scheme. The simulation results indicate that by selecting the appropriate shadow-mask voltage, the addressing speed can be improved due to the local strong electric field. The steady discharge in the sustaining period will not be affected by changes in the shadow-mask voltages in the addressing period. While in the sustaining period, the shadow-mask-voltage variation can directly affect the sustaining discharge. The floating shadow mask in the sustaining period is beneficial in achieving a stable sustaining discharge.

Design and Simulation of Active Frequency-selective Metasurface for Full-colour Plasmonic Display

In this paper, we report a full-colour plasmonic pixel by incorporating a low-index buffer layer and an EO material layer with a gap surface plasmon-based metasuface. The reflection spectra can be modulated by an external voltage bias with a reflectivity higher than 60% when filtering red, green and blue primary light. Vivid colour can be generated by mixing the three primaries in time sequence. Brightness can be tuned by the duty cycle of bright and dark state. Theoretical calculations demonstrate that the switchable pixels we designed can achieve a gamut overlapping 80% area of NTSC colour space and a contrast ratio of 10.63, 26.11 and 2.97 for red, green and blue when using a white quatom-dot-enhancement-film backlit.