As they are light, thin, rollable, break-resistant, and have fewer limitations on space, flexible components, especially flexible displays, are highly attractive for next generation electronic products. Curved is the most common shape for current flexible products. Two methods for measuring the luminance distribution of curved surface sources are investigated in this paper, including the theoretical analysis, numerical simulation, experiment and uncertainty analysis. The luminance measurement results of flexible sources not only depend on the photometric characteristics of the sources themselves, but also depend on the measurement method, such as the setting of the measuring instrument and the measurement position. The results of numerical simulation show that the more the source is unlike a Lambertian source or the smaller the curvature of the source, the greater the effect of the measurement method on the measurement results. Theoretically, the luminance distribution from one measurement method can be estimated from the other method by multiplying by conversion factors. An experiment is performed to verify the possibility of converting and also verify the correction of the theoretical analysis. For precise luminance measurement, position alignment is the key factor to reduce the uncertainty. Unlike with flat surface sources, the luminance measurement result for a curved surface source is strongly dependent on the measurement conditions. The currently documented standards for evaluating the optical performance of a flat surface source may not be appropriate for a flexible surface source. It is necessary to refine a new measurement provision to help the manufacturers utilize the appropriate metrology.
The purpose of this study is to put forward a new reliability-test method for measuring optical characteristics of flexible display under different radii of curvature by using a flexiblecharacteristic inspection system. In addition, for reliability test this study also researches about the optical measurement of flexible display after being bended several times. According to inspection results of the bending characteristics depicted on flexible display, a designer or maker of flexible display can design useful and comfortable flexible display product for human being to obtain more comfortable lifestyle in ubiquitous environment.
Comparisons of CIE-Lab histograms of tested images on FPDs were performed by measurements with a 2D-colorimeter. The images were generated by manipulating original images according to FPD characteristics, correlated color temperature, lightness, and saturation. Experiments show that this method provides quantitative and intuitional data for assessments of the manipulating algorithms. IntroductionColor correction and manipulation (e.g., correlated color temperature (CCT), saturation, and lightness) of FPD are the important processes for the manufacturers to fit both accuracy and favor of consumers. There are many standards and algorithms for achieving this purpose [1-3], while evaluations on the results are essential for proofs of algorithms and further revisions. It was often done by single-point colorimetric measurements or by subjective observations [4,5]. The former method provides quantitative and content-independent results, but lacks of whole information of a tested image on FPD. While the latter will give more perceptual and qualitative rules for adjustments, but may lead to opinions differ and time consuming. To fill the gap between these two methods, this study provides an evaluation method by systematic analyses on the measurements with a 2D-colorimeter. ExperimentsSchematic process for the objective evaluations is shown in Fig. 1. The images for testing the manipulating algorithms were created by a PC controller, and then output to the FPD. The distributions and histograms of colorimetric parameters L*, a*, and b* were calculated from the X, Y, and Z distributions [6]. The original images used in this study are shown in Fig. 2, where the #1 and #2 images were chosen from ISO 12640-2 [7], and #3 is a photograph of a color-checker under a D65 illuminant.Controller FPD Calibrated 2D-Colorimeter
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