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Proceedings Paper

Experimental investigation of distinguishable and non-distinguishable grayscales applicable in active-matrix organic light-emitting diodes for quality engineering
Author(s): Henglong Yang; Wen-Cheng Chang; Yu-Hsuan Lin; Ming-Hong Chen
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Paper Abstract

The distinguishable and non-distinguishable 6-bit (64) grayscales of green and red organic light-emitting diode (OLED) were experimentally investigated by using high-sensitive photometric instrument. The feasibility of combining external detection system for quality engineering to compensate the grayscale loss based on preset grayscale tables was also investigated by SPICE simulation. The degradation loss of OLED deeply affects image quality as grayscales become inaccurate. The distinguishable grayscales are indicated as those brightness differences and corresponding current increments are differentiable by instrument. The grayscales of OLED in 8-bit (256) or higher may become nondistinguishable as current or voltage increments are in the same order of noise level in circuitry. The distinguishable grayscale tables for individual red, green, blue, and white colors can be experimentally established as preset reference for quality engineering (QE) in which the degradation loss is compensated by corresponding grayscale numbers shown in preset table. The degradation loss of each OLED colors is quantifiable by comparing voltage increments to those in preset grayscale table if precise voltage increments are detectable during operation. The QE of AMOLED can be accomplished by applying updated grayscale tables. Our preliminary simulation result revealed that it is feasible to quantify degradation loss in terms of grayscale numbers by using external detector circuitry.

Paper Details

Date Published: 25 August 2017
PDF: 7 pages
Proc. SPIE 10362, Organic Light Emitting Materials and Devices XXI, 1036223 (25 August 2017); doi: 10.1117/12.2272889
Show Author Affiliations
Henglong Yang, National Taipei Univ. of Technology (Taiwan)
Wen-Cheng Chang, National Taipei Univ. of Technology (Taiwan)
Yu-Hsuan Lin, National Taipei Univ. of Technology (Taiwan)
Ming-Hong Chen, National Taipei Univ. of Technology (Taiwan)

Published in SPIE Proceedings Vol. 10362:
Organic Light Emitting Materials and Devices XXI
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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