Surface plasmon tunable filters and flat panel display device

1999 ◽  
Author(s):  
Yu Wang
Keyword(s):  
Surface Plasmon ◽  
Tunable Filters ◽  
Display Device ◽  
Flat Panel Display ◽  
Flat Panel

Performing Accurate Cathodoluminescence Measurements of Phosphor Powders and Screens

1999 ◽  
Vol 560 ◽  
Author(s):  
L. E. Shea ◽  
R. J. Walko
Keyword(s):  
Vacuum Chamber ◽  
Detection System ◽  
Preliminary Evaluation ◽  
Display Device ◽  
Flat Panel Display ◽  
Flat Panel ◽  
Electron Collection ◽  
Field Emission Displays ◽  
Improved Accuracy ◽  
Optical Detection System

ABSTRACTIn the field of display phosphors, the efficiency of the cathodoluminescence process is a characteristic that is often used to assess the potential of a phosphor for use in flat-panel display applications such as field emission displays (FEDs). Cathodoluminescence characterization in a demountable vacuum chamber is important for preliminary evaluation and lifetesting of phosphor powders and screens prior to incorporation into an actual display device. There are many experimental factors that influence accurate measurement and calculation of the cathodoluminescence efficiency. These include electron beam profile (uniform, Gaussian), current density, electron accelerating voltage, secondary electron collection, and optical detection system. This paper will present some methods for achieving improved accuracy of cathodoluminescence measurements in systems at Sandia National Laboratories, using Y2O3:Eu as a representative phosphor.

scholarly journals An electroluminescent-piezoelectric flat-panel display device

1962 ◽  
Vol 5 (6) ◽  
pp. 381-390
Author(s):  
S. Nudelman ◽  
J. Mudar ◽  
G. Trytten ◽  
J. Lambe
Keyword(s):  
Display Device ◽  
Flat Panel Display ◽  
Flat Panel

Performing Accurate Cathodoluminescence Measurements of Phosphor Powders and Screens

1999 ◽  
Vol 558 ◽  
Author(s):  
L. E. Shea ◽  
R. J. Walko
Keyword(s):  
Vacuum Chamber ◽  
Detection System ◽  
Preliminary Evaluation ◽  
Display Device ◽  
Flat Panel Display ◽  
Flat Panel ◽  
Electron Collection ◽  
Field Emission Displays ◽  
Improved Accuracy ◽  
Optical Detection System

ABSTRACTIn the field of display phosphors, the efficiency of the cathodoluminescence process is a characteristic that is often used to assess the potential of a phosphor for use in flat-panel display applications such as field emission displays (FEDs). Cathodoluminescence characterization in a demountable vacuum chamber is important for preliminary evaluation and lifetesting of phosphor powders and screens prior to incorporation into an actual display device. There are many experimental factors that influence accurate measurement and calculation of the cathodoluminescence efficiency. These include electron beam profile (uniform, Gaussian), current density, electron accelerating voltage, secondary electron collection, and optical detection system. This paper will present some methods for achieving improved accuracy of cathodoluminescence measurements in systems at Sandia National Laboratories, using Y2O3:Eu as a representative phosphor.

scholarly journals Optimal Color Lighting for Scanning Images of Flat Panel Display using Simplex Search

2018 ◽  
Vol 4 (11) ◽  
pp. 133
Author(s):  
HyungTae Kim ◽  
EungJoo Ha ◽  
KyungChan Jin ◽  
ByungWook Kim
Keyword(s):  
Image Quality ◽  
Light Source ◽  
Light Emitting Diode ◽  
Optical Filters ◽  
Flat Panel Display ◽  
Flat Panel ◽  
Light Emitting ◽  
Simplex Search ◽  
Inspection Systems ◽  
Color Control

A system for inspecting flat panel displays (FPDs) acquires scanning images using multiline charge-coupled device (CCD) cameras and industrial machine vision. Optical filters are currently installed in front of these inspection systems to obtain high-quality images. However, the combination of optical filters required is determined manually and by using empirical methods; this is referred to as passive color control. In this study, active color control is proposed for inspecting FPDs. This inspection scheme requires the scanning of images, which is achieved using a mixed color light source and a mixing algorithm. The light source utilizes high-power light emitting diodes (LEDs) of multiple colors and a communication port to dim their level. Mixed light illuminates an active-matrix organic light-emitting diode (AMOLED) panel after passing through a beam expander and after being shaped into a line beam. The image quality is then evaluated using the Tenenbaum gradient after intensity calibration of the scanning images. The dimming levels are determined using the simplex search method which maximizes the image quality. The color of the light was varied after every scan of an AMOLED panel, and the variation was iterated until the image quality approached a local maximization. The number of scans performed was less than 225, while the number of dimming level combinations was 20484. The proposed method can reduce manual tasks in setting-up inspection machines, and hence is useful for the inspection machines in FPD processes.

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