9.2: Implementation of RGBW Color System in TFT‐LCDs

Lee, Baek‐woon; Song, Kyoung Doo; Yang, Youngoo; Park, Cheolwoo; Oh, Joonhak; Chai, Chong-Chul; Choi, Jeongye; Roh, Nam‐Seok; Hong, MunPyo; Chung, Kyuha; Lee, Seong-Deok; Kim, Chang-Yong

doi:10.1889/1.1821324

Cited by 31 publications

(13 citation statements)

References 1 publication

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“…The first problem is alleviated significantly by the use of a RGBW color system. [7][8][9] The RGBW system was found to have roughly twice the efficiency of the RGB system. 10 Furthermore, for large displays drawing power from a wall plug, the power efficiency may not matter much once it falls below a certain level.…”

Section: Introductionmentioning

confidence: 99%

Micro‐cavity design of bottom‐emitting AMOLED with white OLED and RGBW color filters for 100% color gamut

Lee

Hwang

et al. 2009

J Soc Info Display

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Abstract— Two optical structures used for a bottom‐emitting white organic light‐emitting diode (OLED) is reported. An RGBW color system was employed because of its high efficiency. For red, green, and blue (RGB) subpixels, the cavity resonance was enhanced by the use of a dielectric mirror, and for the white (W) subpixel, the mirror was removed. The optical length of the cavities was controlled by two different ways: by the thickness of the dielectric filter on top of the mirror or by the angle of oblique emission. With both methods, active‐matrix OLEDs (AMOLEDs) that reproduced a color gamut exceeding 100% of the NTSC (National Television System Committee) standard were fabricated. More importantly, the transmission of a white OLED through R/G/B color filters was significantly higher (up to 50%) than that of a conventional structure not employing a mirror, while at the same time as the color gamut increased from ∼75 to ∼100% NTSC.

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Section: Introductionmentioning

confidence: 99%

Micro‐cavity design of bottom‐emitting AMOLED with white OLED and RGBW color filters for 100% color gamut

Lee

Hwang

et al. 2009

J Soc Info Display

Self Cite

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“…One method is to reduce the brightness of saturated colors, whose brighter end are Out-Of-Gamut for a given backlight brightness level, in a linear manner as a function of saturation [6]. This has the effect of maintaining the hue and saturation while maintaining local contrast, avoiding clipping or clamping artifacts.…”

Section: Rgbw Color Processingmentioning

confidence: 99%

72.1: Invited Paper: PenTile RGBW® Color Processing

Elliott¹,

Higgins²,

Hwang³

et al. 2008

Symp Digest of Tech Papers

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The conversion of tri-vectored color values to quad-vectors creates a degree of freedom that may be used to optimize color reproduction and image reconstruction. Global selection from among possible RGBW metamers improves image texture. Local selection from among possible metamers improves subpixel rendering. Combining RGBW with Dynamic Back Light Control eliminates Out-of-Gamut colors while still maintaining power reduction benefits of RGBW. Local mapping vs. global mapping of Out-of-Gamut colors improves brightness without sacrificing local luminance contrast for more aggressive power savings modes.

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“…However, the optical loss is considerable because CFs only transmit light in accordance with the wavelength of their own colors, and they block other colors. To reduce the power consumption due to CFs, the method using RGB and white (W) sub-pixel structure has been proposed and widely used [4][5][6][7][8]. This method adds a W sub-pixel to not only improve the transmittance of TFT-LCDs, but also to reduce the power consumption under the condition having the same brightness.…”

Section: Introductionmentioning

confidence: 99%

“…This method adds a W sub-pixel to not only improve the transmittance of TFT-LCDs, but also to reduce the power consumption under the condition having the same brightness. However, during the reproduction the saturated colors, such as R, G, B, and yellow (Y), are perceived darker because the transmittance of the RGB sub-pixel is decreased while that of the W sub-pixel is increased, which causes the simultaneous contrast problem [5,9]. Especially, yellowishgreen color looks much dimmer than other colors due to the spectral sensitivity of the human eye [10].…”

Section: Introductionmentioning

confidence: 99%

An RGB to RGBY Color Conversion Algorithm for Liquid Crystal Display Using RGW Pixel with Two-Field Sequential Driving Method

Hong

Kwon

2014

Journal of the Optical Society of Korea

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This paper proposes an RGB to RGBY color conversion algorithm for liquid crystal display (LCD) using RGW pixel structure with two-field (yellow and blue) sequential driving method. The proposed algorithm preserves the hue and saturation of the original color by maintaining the RGB ratio, and it increases the luminance. The performance of the proposed RGBY conversion algorithm is verified using the MATLAB simulation with 24 images of Kodak lossless true color image suite. The simulation results of average color difference CIEDE2000 (ΔE * 00) and scaling factor are 0.99 and 1.89, respectively. These results indicate that the average brightness is increased 1.89 times compared to LCD using conventional RGB pixel structure, without increasing the power consumption and degrading the image quality.

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9.2: Implementation of RGBW Color System in TFT‐LCDs

Cited by 31 publications

References 1 publication

Micro‐cavity design of bottom‐emitting AMOLED with white OLED and RGBW color filters for 100% color gamut

Micro‐cavity design of bottom‐emitting AMOLED with white OLED and RGBW color filters for 100% color gamut

72.1: Invited Paper: PenTile RGBW® Color Processing

An RGB to RGBY Color Conversion Algorithm for Liquid Crystal Display Using RGW Pixel with Two-Field Sequential Driving Method

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