摘要:

Abstract—A new high‐luminance thin‐film electroluminescent (TFEL) device using a zinc gallate phosphor in conjunction with a thick barium titanate ceramic insulator has been developed. A high luminance was attained in TFEL devices using the ZnGa2O4phosphor thin films post‐annealed at 1020°C in argon‐gas atmosphere. Luminances as high as 630 and 200 cd/m2for green emission were obtained for a manganese‐activated zinc gallate (ZnGa2O4: Mn) TFEL device driven by a sinusoidal voltage at 1 kHz and 60 Hz, respectively. Multicolor emission was also realized by TFEL devices using europium‐, terbium‐, thulium‐, or cerium‐activa

ISSN:1071-0922    

DOI:10.1889/1.1984989

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—The variation of luminance with transferred charge in ZnS:Mn ac thin‐film electroluminescent (ACTFEL) display devices was analyzed to determine the roles played by the preferred current paths (filamentary conduction) and manganese clustering in limiting the phosphor efficiency. Luminance‐charge (L‐Q) characteristics were measured in ZnS:Mn ACTFEL devices of varying Mn concentrations.L‐Qcharacteristics showed a reduction in slope at higher values ofQ. Also, the value ofQwhere the slope changed varied with the Mn/Zn ratio. These effects were attributed to the existence of preferred current paths in the phosphor layer where hot‐electron flo

ISSN:1071-0922    

DOI:10.1889/1.1984991

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—This paper describes 6.3‐million‐pixel active‐matrix displays in monochrome and color (1.6 million color groups) with a diagonal dimension of 33 cm (13 in.), first discussed by Martin et al. in 1993. These displays have the largest number of pixels of any AMLCDs thus far reported. The monochrome display is intended for office‐automation applications where there is a requirement for electronically controlled image reproduction with characteristics similar to those of a conventional laser print. This display achieves the resolution, luminance, and viewing angle required for these applications through a binary drivi

ISSN:1071-0922    

DOI:10.1889/1.1984992

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—Better understanding of the addressing mechanisms existing in SSFLC cells, through extensive computer simulation, results in the design of new powerful addressing modes, requiring special material properties and complex waveforms. Very fast addressing at relatively low selection voltages is experimentally obtaine

ISSN:1071-0922    

DOI:10.1889/1.1984993

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—It was found that the value of the pretilt angle of liquid‐crystal alignment achieved by a rubbing technique increases when small projections are present on the substrate surface. A dual‐domain TN‐LCD with very small dc offset voltage across the LC layer was realized by utilizing triangular‐shaped pr

ISSN:1071-0922    

DOI:10.1889/1.1984994

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—The addition of polymers, along with standard parameters such asd/p, elastic constants, and twist state, can be considered another parameter in the optimization of an STN display. A low percentage of a polymer dopant has shown to eliminate stripe formation in 270° STN devices, as well as providing steeper thresholds and wider viewing angles in optimized displays. Data will be presented to show the effect of polymer concentration and curing conditions on STN devic

ISSN:1071-0922    

DOI:10.1889/1.1984995

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—Low‐ΔndSBE displays are optimized for brightness using LCD optics software. These low‐Δnd(about 0.5 to 0.6 μm) SBE displays, or optical‐mode interference (OMI) displays, have the inherent qualities of large cell‐gap tolerances and low coloration without an additional film compensator. The 270° OMI display was found to produce the largest off‐state brightness, greatly improved over current OMI displays. The 270° OMI display was also found to have the best off‐axis viewing angle with respect to chromaticity changes and contrast ratio. Single‐pixel devices with various twist angles verified the optimization. An optimized 270°‐twist OMI device, which shows no striped texture, was constructed by using the polymer‐stabilization technique with a rubbed standard polyimide. The data from the 270° OMI single‐pixel device demonstrate the steepest threshold

ISSN:1071-0922    

DOI:10.1889/1.1984996

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—In this paper we present a five‐mask process to make completely self‐aligned inverted‐staggered amorphous‐silicon TFTs. The mask‐count reduction from a conventional seven‐mask process was accomplished by simultaneous patterning of pixel electrodes and signal lines and by the use of back‐side laser annealing. A mobility value close to 1 cm2/V‐s was obtained for TFTs fabricated u

ISSN:1071-0922    

DOI:10.1889/1.1984997

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Abstract—Most military visual displays are monochrome and green. As systems develop, design, cost, or production factors may justify the use of differently colored displays. The choice of color may impact visual performance. The purpose of this study was to compare visual performance between green and orange chromaticities being considered for a helmet‐mounted display (HMD) under development. Visual stimuli were generated on a color CRT monitor and viewed through colored filters to achieve the desired green and orange colors. Visual acuity (VA), contrast sensitivity (CS), flicker detection, vernier acuity, and peripheral target recognition were assessed in six subjects with measures repeated across green and orange displays. For central visual tasks (VA, CS, vernier, flicker), there was no difference in performance between green and orange displays. However, peripheral target recognition was enhanced with the green display. These results indicate the importance of considering underlying visual mechanisms when selecting parameters for visual displ

ISSN:1071-0922    

DOI:10.1889/1.1984998

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY