Abstract
We analyze how to realize Rec. 2020 wide color gamut with quantum dots. For photoluminescence, our simulation indicates that we are able to achieve over 97% of the Rec. 2020 standard with quantum dots by optimizing the emission spectra and redesigning the color filters. For electroluminescence, by optimizing the emission spectra of quantum dots is adequate to render over 97% of the Rec. 2020 standard. We also analyze the efficiency and angular performance of these devices, and then compare results with LCDs using green and red phosphors-based LED backlight. Our results indicate that quantum dot display is an outstanding candidate for achieving wide color gamut and high optical efficiency.
Highlights
Wide color gamut enables a display device to represent the real object accurately
For an quantum dots (QDs)-liquid crystal display (LCD), the angular performance is primarily determined by the birefringence of the LC material [33]
The “on edge” and “film” approaches for QDs are not as efficient as the white LED with 2p phosphors because of the longer optical path. For both quantum-dot light emitting devices (QLEDs) and QD-LCD, widening color gamut is associated with reduced optical efficiency
Summary
Wide color gamut enables a display device to represent the real object accurately. Several standards have been proposed to regulate how a display should reproduce colors, such as the Adobe RGB [1], SMPTE RP 431-2 for digital cameras [2], Rec.709 for high definition TVs [3], and Rec. 2020 for ultra-high definition (UHD) TVs [4]. The Rec. 2020 standard can be realized with monochromatic laser sources, for a real display, laser sources are expensive and the speckle problem [8] has not yet been fully solved. In this sense, it is preferred to find non-monochromatic light sources to realize the Rec. 2020 standard. It is preferred to find non-monochromatic light sources to realize the Rec. 2020 standard Among these candidates, quantum dots (QDs) have attracted much attention because of their narrow and tunable emission spectra [9]. We will discuss how to realize the Rec. 2020 standards with both approaches, and the tradeoff between color gamut and optical efficiency
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