21.3: D‐ILA™ Technology for Electronic Cinema

Sterling, R. D.; Bleha, W. P.

doi:10.1889/1.1832945

Cited by 18 publications

(12 citation statements)

References 3 publications

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“…[1][2][3][4] In direct-view displays, ultraviolet (UV) light is often used to seal the LC panels. In projection displays using liquid-crystal-on-silicon (LCOS), 5 the employed arc lamp is relatively bright. Although a cold mirror and a hot mirror are used to filter out the unwanted UV and infrared contents of the lamp, residual UV light could still penetrate into the LC panels and cause performance degradation.…”

Section: Introductionmentioning

confidence: 99%

Photostability of liquid crystals and alignment layers

Wen

Gauza

2005

J. Soc. Inf. Display

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-Photostability of liquid-crystal (LC) materials and surface alignment layers was evaluated using a UV lamp and a blue laser beam. Both organic polyimide (PI) and inorganic silicon-dioxide (SiO 2 ) alignment layers were studied under nitrogen environment. Two commercial TFT-grade LC mixtures (low-birefringence MLC-9200-000 and high-birefringence TL-216) were used for comparisons. Results indicate that SiO 2 alignment layers are much more robust than PI layers, and low birefringence LCs are more stable than the high-birefringence ones. At the He-Cd laser wavelength (λ = 442 nm), both LC mixtures and SiO 2 alignment layers are hardly damaged. To lengthen the lifetime of an LCD projector, inorganic SiO 2 alignment layers, high-optical-density UV filter, long cutoff-wavelength blue filter, and short-conjugation (low birefringence) LC materials should be considered.Keywords -Liquid crystals, photostability, lifetime, alignment layers, inorganic SiO 2 , LCD projector. IntroductionPhotostability of liquid-crystal (LC) materials and alignment layers play a crucial role in affecting the lifetime of liquid-crystal-display (LCD) devices. [1][2][3][4] In direct-view displays, ultraviolet (UV) light is often used to seal the LC panels. In projection displays using liquid-crystal-on-silicon (LCOS), 5 the employed arc lamp is relatively bright. Although a cold mirror and a hot mirror are used to filter out the unwanted UV and infrared contents of the lamp, residual UV light could still penetrate into the LC panels and cause performance degradation. Even if the UV contents are completely filtered out, the blue wavelength might still be harmful to the LCD panels. These high-energy photons could cause gradual degradation of the organic alignment layers and the LC molecules. Once the LC medium is decomposed or the alignment layers deteriorated, the pretilt angle is changed and the consequent electro-optic effects are altered. 6 In this paper, we report the photostability of LC alignment layers and LC materials in the UV and blue wavelengths. Regarding the alignment layers stability, we studied the buffed polyimide (PI) and sputtered inorganic silicondioxide (SiO 2 ) alignment layers under nitrogen environment. On the LC-material stability studies, we selected two Merck LC mixtures: TL-216 (∆n = 0.20) and MLC-9200-000 (∆n = 0.08). A high birefringence LC mixture, such as TL-216, enables a thinner cell gap to be used. The advantages are twofold: (1) faster response time and (2) weaker fringing-field effect. For instance, the Philips color-sequential LCOS projector 7 uses a~1-µm cell gap in order to achieve fast response time and minimize the fringing-field effect. On the other hand, a low-birefringence LC mixture, such as MLC-9200-000, is commonly used for three-panel LCOS projectors. UV stability of LC alignment layersThe Hamamatsu UV light was delivered to the sample through a fiber bundle and collimated by a lens. The output light passed through a narrow-band interference filter centered at λ~365 nm. The light intensity ...

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Section: Introductionmentioning

confidence: 99%

Photostability of liquid crystals and alignment layers

Wen

Gauza

2005

J. Soc. Inf. Display

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“…This would allow single chip optical engines, reducing the cost significantly. It is possible to obtain single panel operation by using color filters on the panel, either conventional [81] or the more advanced holographic ones [82], but this inevitably leads to either resolution loss or larger panels and is therefore not favored.…”

Section: B Response Speedmentioning

confidence: 99%

VAN LCOS Microdisplays: A Decade of Technological Evolution

Cuypers

Smet

Calster

2011

J. Display Technol.

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Abstract-Microdisplays of the liquid crystals on silicon (LCOS)type have gone through a rapid evolution during the last decade. We present an overview of how vertically aligned nematic (VAN) LCOS have evolved from an attractive, but notoriously difficult and even infamous technology, to the mainstream microdisplay technology that it is today. At the same time, we highlight a number of remaining issues and concerns, and present some ideas of how to remedy them. Index Terms-Liquid crystals on silicon (LCOS), microdisplay, vertically aligned nematic (VAN).

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“…However, the ILA projector was assembled with at least two technologies (2.5" diagonal CRT back-written ILA panels and liquid immersed polarization prisms), which are now considered obsolete. JVC has continued projector development activities around their D-ILA reflective liquid-crystal-on-silicon (LCOS) chip technology [3], including the 5000 lumen QX-1 projector.…”

Section: Introductionmentioning

confidence: 99%

12.1: Digital Cinema Projection with R‐LCOS Displays

Kurtz

Silverstein

Cobb

2004

Symp Digest of Tech Papers

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A digital cinema projector developed by Eastman Kodak Company, utilizing three JVC QXGA liquid crystal displays (LCDs), and providing 12,000 lumens, 2,000:1 contrast, and 3 Mpixel resolution, is described. This system, which has a novel optical configuration, wire grid polarizers and polarization compensators, provides high contrast at low F#, a large color gamut, and minimal stress birefringence at high power.

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21.3: D‐ILA™ Technology for Electronic Cinema

Cited by 18 publications

References 3 publications

Photostability of liquid crystals and alignment layers

Photostability of liquid crystals and alignment layers

VAN LCOS Microdisplays: A Decade of Technological Evolution

12.1: Digital Cinema Projection with R‐LCOS Displays

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