Improvement of Color and Luminance Uniformity of the Edge-Lit Backlight Using the RGB LEDs

Son, Chang-Gyun; Yi, Jonghoon; Gwag, Jin-Seog; Kwon, Jin-Hyuk; Park, Gyeung-Ju

doi:10.3807/josk.2011.15.3.272

Cited by 29 publications

(21 citation statements)

References 9 publications

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“…Using the obtained values of R and blue λ , the ratio of phosphor absorption,  is calculated to be 0.762 from Eq. (12). Consequently, from Eq.…”

Section: Resultsmentioning

confidence: 98%

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Analysis on the Luminous Efficiency of Phosphor-Conversion White Light-Emitting Diode

Ryu

2013

Journal of the Optical Society of Korea

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The author analyzes the luminous efficiency of the phosphor-conversion white light-emitting diode (LED) that consists of a blue LED chip and a yellow phosphor. A theoretical model is derived to find the relation between luminous efficiency (LE) of a white LED, wall-plug efficiency (WPE) of a blue LED chip, and the phosphor absorption ratio of blue light. The presented model enables to obtain the theoretical limit of LE and the lower bound of WPE. When the efficiency model is applied to the measured results of a phosphor-conversion white LED, the limit theoretical value of LE is obtained to be 261 lm/W. In addition, for LE of 88 lm/W at 350 mA, the lower bound of WPE in the blue LED chip is found to be ~34%. The phosphor absorption ratio of blue light was found to have an important role in optimizing the luminous efficiency and colorimetric properties of phosphor-conversion white LEDs.

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“…Using the obtained values of R and blue λ , the ratio of phosphor absorption,  is calculated to be 0.762 from Eq. (12). Consequently, from Eq.…”

Section: Resultsmentioning

confidence: 98%

“…Assuming that the radiative efficiency of the phosphor, rad phos η is 100%, the lowest limit of  can be obtained from Eq. (12). P b and P y in Eq.…”

Section: Resultsmentioning

confidence: 99%

Analysis on the Luminous Efficiency of Phosphor-Conversion White Light-Emitting Diode

Ryu

2013

Journal of the Optical Society of Korea

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“…The backlight plays important roles in LCDs that affects the brightness, angular luminance profile, and the image quality [2]. The poor color gamut and the poor brightness uniformity of the backlight result directly in the poor image quality and the poor brightness uniformity of the LCD, respectively [3][4][5]. Although the white light emitted from the white LEDs is well controlled with sufficient color gamut, the color nonuniformity occurs due to the wavelength-dependent scattering such as the Rayleigh scattering during propagation through the lightguide because there are fine scattering patterns on the bottom surface of the lightguide.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wavelength-dependent Scattering on the Color Chromaticity of the LCD Backlight

Kwon

Jun

Gwag

et al. 2013

Journal of the Optical Society of Korea

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The effect of the wavelength-dependent scattering on the change of the color chromaticity in the lightguide panel of a liquid crystal display is examined. The white light emitted from the white LEDs located at the edge of the lightguide propagates in the lightguide and is scattered by the patterned dots that are placed on the bottom of the lightguide. The scattered lights that are far from the LEDs showed reddish color compared to the bluish color that is scattered from the near area from the LEDs. The color difference was between 0.01 to 0.06 depending on the resin and the thickness of the lightguide.

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“…LED light has more advantages than fluorescent light and incandescent lamps, such as long life, low power consumption, high efficiency, and rapid switching [1][2][3][4][5] . Because LEDs are a kind of controllable digital device, studies of the convergence of LED and IT are being performed actively.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Performance of CSK Scheme for V2I Visible Light Communication

Kim

Jung³

2015

The Journal of Korean Institute of Communications and Informati

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These days, research related to Intelligent Transportation System (ITS) technology is being widely considered.ITS is inevitable for future transportation systems to reduce accidents, congestion, and offer a smooth flow of traffic. The use of Visible Light Communication (VLC) in ITS systems has been considered widely because of its EMC/EMI free and LED infrastructure reusable properties. Among the VLC schemes, this study analyzed the performance of the Color Shift Keying (CSK) scheme under a Vehicle-to-Infrastructure (V2I) downlink scenario to verify the capability of CSK as a communication tool for ITS. By modeling daylight noise using the modified Blackbody radiation model, this study examined the performance of V2I VLC under daytime conditions. The relationship between BER, the communication distance, and the amount of ambient-light noises under the pre-described V2I scenario were determined by simulations. 596 Fig. 1. Spectral selection example for codes (110, 010, 000) [9] profit than RF-based ITS solutions. Therefore, many studies of the convergence of VLC technology with ITS systems have been performed [17][18][19][20][21][22][23][24] .This study analyzed the performance of the Color Shift Keying (CSK) scheme under a Vehicle-to-Infrastructure (V2I) downlink scenario.The CSK scheme is a type of VLC scheme proposed by the IEEE 802.15.7 VLC standard, which transmits data using multi-spectral LEDs, such as Red, Green, and Blue LEDs [8][9][10] . Therefore, it transmits data by changing the emitted power of

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Improvement of Color and Luminance Uniformity of the Edge-Lit Backlight Using the RGB LEDs

Cited by 29 publications

References 9 publications

Analysis on the Luminous Efficiency of Phosphor-Conversion White Light-Emitting Diode

Analysis on the Luminous Efficiency of Phosphor-Conversion White Light-Emitting Diode

Effect of Wavelength-dependent Scattering on the Color Chromaticity of the LCD Backlight

Performance of CSK Scheme for V2I Visible Light Communication

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