Enhanced image quality of OLED transparent display by cholesteric liquid crystal back-panel

Li, Cheng-Chang; Tseng, Heng-Yi; Liao, Hung-Chia; Chen, Han-Ming; Hsieh, Tsung−Eong; Lin, Sin-An; Jau, Hung‐Chang; Wu, Yu‐Ching; Hsu, Yuan‐Jun; Hsu, Wen‐Hao; Lin, Tung‐Ching

doi:10.1364/oe.25.029199

Cited by 31 publications

(19 citation statements)

References 25 publications

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“…However, the key function of a transparent display is, of course, to produce images in high fidelity. This, in turn, led to a few reports that actually proposed applying additional structures to partially block the exterior lights [5,6]. Regardless of these conflicting approaches to study transparent displays, it is necessary to start with a fundamental research on human perception of the images on a transparent display in ambient surround conditions, in order to improve the perceived image quality.…”

Section: Introductionmentioning

confidence: 99%

Transparent effect on the gray scale perception of a transparent OLED display

Kim¹,

Seo²,

Kwak³

2018

Opt. Express

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Gray scale perception of transparent OLED displays was explored. The difference in luminance between transparent and non-transparent stimuli in the overall gray range was compared. The transparent effect appeared in gray scale perception. The range of the transparent effect was determined experimentally. To explore the practical application of this effect, we proposed a new tone-curve based on the transparent effect. In the preference experiment, participants indicated a higher preference score for the new tone-curve. This implied that the transparent effect is valid and applicable to real situations.

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Section: Introductionmentioning

confidence: 99%

Transparent effect on the gray scale perception of a transparent OLED display

Kim¹,

Seo²,

Kwak³

2018

Opt. Express

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“…The mode has excellent brightness since no external polarizers are required. Good contrast ratios have been obtained [ (turn on) and 20ms to 32ms (turn off) [6]. However, the cholesteric shutter with sub-millisecond response time, has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

66‐4: Late‐News Paper: Fast Dichroic‐Dye‐Doped Cholesteric Liquid Crystals Light Shutter

Feng

Beev

Bos

2019

Symp Digest of Tech Papers

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We demonstrate a dichroic‐dye‐doped cholesteric liquid crystal light shutter device with fast response time, achromatic dark state, and polarization independence. The liquid crystal director is switching between the transparent homeotropic state to a dark transient planar state without scattering, and continually to focal conic state with little scattering. The device fabrication process is simple because of no alignment is needed and a simple electrodes structure used. It has potential to be applied in automotive applications to block oncoming headlight glare, and in AR real world image occlusion.

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“…The other stable state is the focal conic state, in which the helical axes are randomly distributed, forming a multi-domain structure with strong light scattering. The CLC must generally have a particular cell gap-to-pitch ratio (d/p) and surface alignment to maintain its stability [13,20]. In a vertical alignment film with large d/p, the cholesteric liquid crystal cannot be easily be put into the planar state, disfavoring transparency; in a homogenous alignment film with small d/p, the cholesteric liquid crystal cannot easily enter the focal conic state, disfavoring scattering and resulting in a poor contrast ratio.…”

Section: Introductionmentioning

confidence: 99%

Smart Window with Active-Passive Hybrid Control

et al. 2020

Self Cite

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Dimming and scattering control are two of the major features of smart windows, which provide adjustable sunlight intensity and protect the privacy of people in a building. A hybrid photo- and electrical-controllable smart window that exploits salt and photochromic dichroic dye-doped cholesteric liquid crystal was developed. The photochromic dichroic dye causes a change in transmittance from high to low upon exposure to sunlight. When the light source is removed, the smart window returns from colored to colorless. The salt-doped cholesteric liquid crystal can be bi-stably switched from transparent into the scattering state by a low-frequency voltage pulse and switched back to its transparent state by a high-frequency voltage pulse. In its operating mode, an LC smart window can be passively dimmed by sunlight and the haze can be actively controlled by applying an electrical field to it; it therefore exhibits four optical states—transparent, scattering, dark clear, and dark opaque. Each state is stable in the absence of an applied voltage. This smart window can automatically dim when the sunlight gets stronger, and according to user needs, actively adjust the haze to achieve privacy protection.

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Enhanced image quality of OLED transparent display by cholesteric liquid crystal back-panel

Cited by 31 publications

References 25 publications

Transparent effect on the gray scale perception of a transparent OLED display

Transparent effect on the gray scale perception of a transparent OLED display

66‐4: Late‐News Paper: Fast Dichroic‐Dye‐Doped Cholesteric Liquid Crystals Light Shutter

Smart Window with Active-Passive Hybrid Control

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