Curved Displays Challenge Display Metrology

Becker, Michael E.; Neumeier, Jürgen; Wolf, M.

doi:10.1002/j.2637-496x.2018.tb01056.x

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…To provide various viewing styles and human interfaces, different curvatures are designed for different display panels. The curvature of curved TVs and computer monitors 9,10 is large, usually around 1000 mm (R 1000) or larger, whereas wearable devices and mobile devices need a small curvature, for example, R 50 or smaller 6,11,12 . In automotive application, 13,14 the curvature usually stays between R 50 and R 1000 3 .…”

Section: Introductionmentioning

confidence: 99%

Curved vertical‐alignment liquid crystal display with uniform brightness: From pixel design to verification

Cao¹,

Chen²,

Du³

et al. 2020

J Soc Info Display

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Curved liquid crystal display (LCD) suffers from an issue of uneven brightness among the vertical-alignment LCD panels based on thin glass substrates. In this work, we investigated its origin through optical simulation and successfully realized uniform brilliance for 27-inch curved LCD panels. The optical simulation revealed that the dark areas on the bending sides of the curved LCD panel originated from the reduced azimuth angle of the liquid crystals (LC) next to the ITO trunk. This issue could be resolved by decreasing the pretilt angle of the LC on the color filter side. Through developing pretilt angle tuning technologies, we experimentally verified that the uniform brilliance could be achieved for 27-inch curved LCD panels with 900-mm curvature on thin glass substrates. K E Y W O R D S curved LCD, optical simulation, pretilt angle, uniform brightness

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Section: Introductionmentioning

confidence: 99%

Curved vertical‐alignment liquid crystal display with uniform brightness: From pixel design to verification

Cao¹,

Chen²,

Du³

et al. 2020

J Soc Info Display

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show abstract

“…The measurement of large curved displays have been studied and documented [4][5][6][7]. Nevertheless the issues of flexible light sources (FLSs) with small radius, i.e., the degree of flatness and the surface geometric structure, hitherto have not been studied.…”

Section: Introductionmentioning

confidence: 99%

43‐2: Optical Characteristics of Curved Flexible Light Sources (FLSs) with Small Radius and Metrology Issues

Käläntar

Tashiro

Maeda³

et al. 2019

Symp Digest of Tech Papers

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Planar flexible light sources (FLSs) have a variety of features that give a boost to their applications. In this paper, we studied the effect of curvature radius on optical characteristics of convex FLS. For this purpose the properties of a cylindrical OLED as an FLS were studied theoretically and experimentally. The most fundamental characteristic of a FLS is the total luminous flux, the radiation pattern and the spectrum. Two OLED samples with barrier layer thickness of 100 nm and 150 nm were fabricated and their characteristics were measured at curvature radii of R0= mm (flat), R2=143mm (curved) and R5=56.7 mm (curved). Furthermore, the measurement field contours were calculated for non-tilted and tilted flat planes, and on inner and outer surfaces of a cylindrical FLS. Finally, the metrology issues of the curved FLS were discussed.

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“…Since bending a lighting unit alters the optical properties of the unit, assessment of optical performance of the display lighting units in a curved state, i.e., stretched or shrunken conditions is indispensable for manufacturing societies. In contrast to flat display lighting unit, a curved or flexible light source introduces new issues and measurement challenges [1][2][3]. Optical characteristics should be evaluated to assure the integration of the lighting unit with the flexible display because characteristics such as spatial and angular luminance, luminance uniformity or virtual luminance uniformity, chromaticity distribution, color uniformity, luminous intensity distribution, local luminous flux and etendue of the flexible light source change with decreasing radius of curvature.…”

Section: Introductionmentioning

confidence: 99%

14‐4: Optical Characteristics of Flexible Display Light Sources with Arbitrary Curvatures

Käläntar¹,

Maeda²

2018

Symp Digest of Tech Papers

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New emerging flexible light sources (FLS) have a variety of features that boost their usage. The issues of FLSs with small radii are resolved for arbitrary curvatures and the differences between flat and curved light sources are explained. We found that the change in curvature radius of a FLS, either convex or concave, results a defocus issue, a change in emission surface, a variation of luminous intensity distribution and a change in etendue of the FLS. The effect of curvature on the optical properties of curved OLEDs as FLSs are verified in experiments.

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Curved Displays Challenge Display Metrology

Abstract: Non‐planar displays require a close look at the components involved in taking their measurements.

Cited by 4 publications

References 6 publications

Curved vertical‐alignment liquid crystal display with uniform brightness: From pixel design to verification

Curved vertical‐alignment liquid crystal display with uniform brightness: From pixel design to verification

43‐2: Optical Characteristics of Curved Flexible Light Sources (FLSs) with Small Radius and Metrology Issues

14‐4: Optical Characteristics of Flexible Display Light Sources with Arbitrary Curvatures

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