240 Hz OLED technology properties that can enable improved image quality

Hoffman, David M.; Johnson, Paul V.; Kim, Joohwan S.; Vargas, Andy D.; Banks, Martin S.

doi:10.1002/jsid.258

Cited by 17 publications

(15 citation statements)

References 40 publications

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“…OLED displays can thus be driven at high frame rates. A particular 240‐Hz OLED display prototype is capable of showing 240 unique frames per second and thus supports faster‐than‐normal capture rates and could thereby greatly reduce motion artifacts . The high frame rate also enables a dual‐viewer S3D mode in which the four views needed for two viewers to see a left‐ and right‐image pair are temporally multiplexed on a single display.…”

Section: Introductionmentioning

confidence: 99%

“…A particular 240-Hz OLED display prototype is capable of showing 240 unique frames per second and thus supports faster-than-normal capture rates and could thereby greatly reduce motion artifacts. 11 The high frame rate also enables a dual-viewer S3D mode in which the four views needed for two viewers to see a left-and right-image pair are temporally multiplexed on a single display. Two possible driving modes are L A R A L B R B and L A L B R A R B , where L A and R A are the left-and right-eye views for viewer A, and L B and R B are the left-and right-eye views for viewer B.…”

Section: Introductionmentioning

confidence: 99%

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Motion artifacts on 240-Hz OLED stereoscopic 3D displays

Johnson

Kim

Hoffman

et al. 2014

Jnl Soc Info Display

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-Temporal multiplexing is a popular approach for presenting different images to the two eyes in stereoscopic 3D (S3D) displays. We examined the visibility of flicker and motion artifacts-judder, motion blur, and edge banding-on a 240-Hz temporally multiplexed S3D OLED display. Traditionally, a frame rate of 120 Hz (60 Hz per eye) is used to avoid visible flicker, but there is evidence that higher frame rates provide visible benefits. In a series of psychophysical experiments, we measured the visibility of artifacts on the OLED display using temporal multiplexing and those of a 60-Hz S3D LCD using spatial multiplexing. We determined the relative contributions of the frame rate of the content, update rate of the display, duty cycle, and number of flashes. We found that short duty cycles and low flash numbers reduce the visibility of motion artifacts, while long duty cycles and high flash numbers reduce flicker visibility.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Motion artifacts on 240-Hz OLED stereoscopic 3D displays

Johnson

Kim

Hoffman

et al. 2014

Jnl Soc Info Display

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“…We circumvent these challenges by using a prototype 55‐inch RGB organic light‐emitting diode (OLED) display system as an emulation platform for the hypothetical displays we would like to consider . This display has 1920 × 1080 resolution, a 2.4 gamma function, and 9‐bit precision using a 240 Hz temporal dither.…”

Section: Methodsmentioning

confidence: 99%

“…We circumvent these challenges by using a prototype 55-inch RGB organic light-emitting diode (OLED) display system as an emulation platform for the hypothetical displays we would like to consider. 10 This display has 1920 × 1080 resolution, a 2.4 gamma function, and 9-bit precision using a 240 Hz temporal dither. We can process imagery identically for two test display conditions and then parameterize backlight or panel attributes to create different renderings that can be shown side-by-side on the OLED display.…”

Section: High-dynamic-range Display Emulationmentioning

confidence: 99%

Efficacy of global dimming backlight and high‐contrast liquid crystal panel for high‐dynamic‐range displays

Choi

Hoffman

2017

J Soc Info Display

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Using an RGB organic light‐emitting diode display to emulate liquid crystal display systems, we examined the efficacy of different global dimming strategies for cinematic content. A global dimming solution with smoothed transitions was preferred over solutions using a static backlight level or the highly aggressive frame‐by‐frame backlight adjustment scheme. We compared two such smoothing approaches, one making use of causal data, and another using future information (which could be available via latency or dynamic metadata) and did observe some opportunities for an improved experience, but found the causal data to be a competitive approach. We also evaluated the importance of native panel contrast and how global dimming compares to local dimming approaches. For most content tested, a global dimming display with a high‐contrast liquid crystal panel was judged as being equivalent or more preferred to a full‐array local dimming display with a low‐contrast panel. These results build on the existing evidence that native panel contrast remains one of the strongest predictors of high‐dynamic‐range image quality even as backlight technologies continue to improve.

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“…Presentation rate has been shown to be the major determinant of flicker visibility [1,6,15]. The threshold for temporally interlaced S3D displays is ~40Hz [1].…”

Section: Experiments 2: Flickermentioning

confidence: 99%

Stereoscopic 3D display technique using spatiotemporal interlacing has improved spatial and temporal properties

Johnson¹,

Kim²,

Banks³

2015

Opt. Express

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Stereoscopic 3D (S3D) displays use spatial or temporal interlacing to send different images to the two eyes. Temporal interlacing delivers images to the left and right eyes alternately in time; it has high effective spatial resolution but is prone to temporal artifacts. Spatial interlacing delivers even pixel rows to one eye and odd rows to the other eye simultaneously; it is subject to spatial limitations such as reduced spatial resolution. We propose a spatiotemporal-interlacing protocol that interlaces the left-and right-eye views spatially, but with the rows being delivered to each eye alternating with each frame. We performed psychophysical experiments and found that flicker, motion artifacts, and depth distortion are substantially reduced relative to the temporalinterlacing protocol, and spatial resolution is better than in the spatialinterlacing protocol. Thus, the spatiotemporal-interlacing protocol retains the benefits of spatial and temporal interlacing while minimizing or even eliminating the drawbacks.

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240 Hz OLED technology properties that can enable improved image quality

Cited by 17 publications

References 40 publications

Motion artifacts on 240-Hz OLED stereoscopic 3D displays

Motion artifacts on 240-Hz OLED stereoscopic 3D displays

Efficacy of global dimming backlight and high‐contrast liquid crystal panel for high‐dynamic‐range displays

Stereoscopic 3D display technique using spatiotemporal interlacing has improved spatial and temporal properties

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