49.1: New Concept for Improvement of White Color Balance in Hologram Back‐light Units

Lee, S. M.; Choi, Hwan‐Young; Lee, M. G.; Min, Jiyoung; Choi, J. S.; Kim, J. H.; Kim, S. I.; Choi, Yun-Hyuk; Lee, K. H.

doi:10.1889/1.1832538

Cited by 7 publications

(5 citation statements)

References 6 publications

(5 reference statements)

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“…5 As shown in Fig. 1(b), the issue of this grating array is the generation of color offset, which is apparent, especially on two sides on the light guide [1]. To lessen the color offset, a grating array composed of five-period subwavelength grating was proposed in this study (Fig.…”

Section: Backlight Systemmentioning

confidence: 99%

“…The applications of sub‐wavelength gratings in displays have been expanding in recent years. S. M. Lee designed a series of sinusoidal gratings for producing highly collimated white light to replace the diffuser and the prism sheet in a display . Ye and Park proposed a similar approach to improve the light illuminance and uniformity by optimizing the grating depths.…”

Section: Introductionmentioning

confidence: 99%

“…S. M. Lee designed a series of sinusoidal gratings for producing highly collimated white light to replace the diffuser and the prism sheet in a display. 1 Ye and Park proposed a similar approach to improve the light illuminance and uniformity by optimizing the grating depths. Their approach can control the scattering directions and eliminate the dark region or hot spots in the viewing direction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Roll‐to‐roll UV embossing process applied for light bar‐based sub‐wavelength gratings for backlight

2012

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-This study proposes a roll-to-roll process-based sub-wavelength grating, which is attached on a light bar to turn the side-lit red/green/blue (620, 520, and 450 nm) incident rays into a uniformly and normally output white light with high illuminance from the light bar's surface. On the basis of the rigorous coupling wave analysis, the relationship between the firstorder transmission/reflection efficiency and the pitch of the gratings with different shapes was analyzed. The optimal design can effectively reduce the coupling length and enhance the white color balance for display applications.

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Section: Backlight Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Roll‐to‐roll UV embossing process applied for light bar‐based sub‐wavelength gratings for backlight

2012

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“…The calculations calculated road condition and uniformity of road that by using an optimized reflector, road brightness uniformity is improved [2][3][4]. We considered a set the several road lights, and then investigated the continuous road brightness uniformity conditions [2,[5][6][7].…”

Section: Department Of Electricity Engineering Division Of Engineerimentioning

confidence: 99%

Study of a Ray-Tracing Method for Optimized Road Light Design

Choi²

2010

Transactions on Electrical and Electronic Materials

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A study is presented of improved road light design for drivers and pedestrians with the use of a ray-or reverse raytracing method. Many existing road lights are unsuitable for drivers and pedestrians because of serious problems such as glare effect or randomicity of illuminated areas. This situation has arisen because in customary design methods the emphasis has been on simple factors such as luminance or electrical power. However a high luminance or electrical power consumption, alone, do not guarantee bright and good road lighting. So we have applied a ray-tracing method to the design of a road light reflector with the goals of ensuring that illuminated objects on the road can be seen more clearly and that the illuminating light is more comfortable for the eyes of drivers and pedestrians. We have set design targets for factors such as the uniformity of lighting on the road area per road light, the shading angles and the continuous luminance uniformity on long lengths of road. For set heights of the eyes of drivers and pedestrians eyes we have calculated a design guideline for the achievement of the above design targets. Then we designed a road light reflector using the reverse ray-tracing approach. Also we have achieved the same luminance on the road with almost half the power consumption, through the reduction of lighty loss. In an ideal design optimum parameters are suggested to be a shading angle of 75 degrees and a luminance uniformity of 0.5 on the road area. This reflector performance is achievable with a 250 watt power consumption ceramic discharge metal light source.

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“…To enhance efficiency, the pitch of the grating can be as low as 320 nm. In 2003, S. M. Lee designed a series of sub-wavelength gratings for producing highly collimated white light to replace the diffuser and the prism sheet in a display [3]. Ye and Park proposed a similar approach to improve the light illuminance and uniformity by optimizing the grating depths.…”

Section: Introductionmentioning

confidence: 99%

44.5: Roll‐to‐Roll UV Embossing‐Process‐Based Sub‐Wavelength Gratings for Backlight

Liu

Lee

Ting

et al. 2012

Symp Digest of Tech Papers

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A sub-wavelength gratings (SWG) patterned light bar (LB) was proposed to reduce the coupling length and improve the white color balance for display applications. In this design, we used ultraprecision machining and a roll-to-roll imprinting process based UV resin process to make SWG for display applications. Author KeywordsBacklight unit；sub-wavelength grating；Light bar；ultraprecision machining；Roll-to-roll imprinting process

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49.1: New Concept for Improvement of White Color Balance in Hologram Back‐light Units

Cited by 7 publications

References 6 publications

Roll‐to‐roll UV embossing process applied for light bar‐based sub‐wavelength gratings for backlight

Roll‐to‐roll UV embossing process applied for light bar‐based sub‐wavelength gratings for backlight

Study of a Ray-Tracing Method for Optimized Road Light Design

44.5: Roll‐to‐Roll UV Embossing‐Process‐Based Sub‐Wavelength Gratings for Backlight

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