68.4: Micro‐cavity Design of RGBW AMOLED for 100% Color Gamut

Abstract

We report two optical structures for bottom‐emitting white OLED. We employed RGBW color system because of its high efficiency. for RGB‐subpixels, the cavity resonance was enhanced by dielectric mirror, and for W‐subpixel, the mirror was removed. Optical lengths were controlled by two different methods: by the thickness of dielectric filler on top of the mirror or by the angle of oblique emission. with both methods, we were able to fabricate AMOLEDs that exhibited color gamut exceeding 100% NTSC. More importantly, the transmission of white OLED through R/G/B color filters was significantly higher (up to 50%) than that of the conventional structure employing no mirror, even though the color gamut increased from ∼75% to ∼100%.

High-resolution OLED display with remarkably low power consumption using blue/yellow tandem structure and RGBY subpixels

“…[2][3][4] For the white subpixel, light emission from the white OLED can be used directly without a color filter, leading to high efficiency and low power consumption.…”

Transmissive/Reflective Structural Color Filters: Theory and Applications

“…A narrow band and high transmission can be achieved by changing the parameter of the color filters, making these types of color filters have potential advantages in OLED display. As shown in Figure 19, in the color filters, distributed Bragg reflector acts as the half mirror; IZO/ITO and SiN x are used as the optical filler to tune the color [76]. By integrating the structures at the emitting surface of the OLED, a set of colorful OLEDs were achieved.…”

Development of a high-resolution RGBW flexible display using a white organic light-emitting diode with microcavity structure and that of a side-roll touch panel

“…Modern mobile devices require power‐saving displays. One proposed technique for reducing power consumption is to add a white (W) sub‐pixel to a pixel that is composed of red (R), green (G), and blue (B) sub‐pixels . However, combining this RGBW structure with the WTC structure has been difficult.…”

“…One proposed technique for reducing power consumption is to add a white (W) sub-pixel to a pixel that is composed of red (R), green (G), and blue (B) sub-pixels. 10,11 However, combining this RGBW structure with the WTC structure has been difficult. While emission of light in a wide wavelength range is required for white light to be emitted from the W sub-pixel in the RGBW structure, the microcavity effect in the WTC structure increases the intensity of light with a specific wavelength and prevents emission of white light.…”