Full-color AMOLED with RGBW pixel pattern

Abstract

Abstract— A full‐color AMOLED display with an RGBW color filter pattern has been fabricated. Displays with this format require about one‐half the power of analogous RGB displays. RGBW and RGB 2.16‐in.‐diagonal displays with average power consumptions of 180 and 340 mW, respectively, were characterized for a set of standard digital still camera images at a luminance of 100 cd/m2. In both cases, a white‐emitting AMOLED was used as the light source, and standard LCD filters were used to provide the R, G, and B emission. The color gamuts of these displays were identical and the higher overall efficiency of the RGBW format results from two factors. First, a large fraction of a typical image is near neutral in color and can be reproduced using the white sub‐pixel. Second, the white sub‐pixel in an RGBW AMOLED display is highly efficient because of the absence of any color filter. The efficiency of these displays can be further enhanced by choosing a white emitter optimized to the target display white point (in this case D65). A two‐emission layer configuration based upon separate yellow and blue‐emitting regions is shown to be well suited for both the RGBW and RGB formats.

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

“…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.…”

Review Paper: Multi‐primary‐color displays: The latest technologies and their benefits

“…This can be formulated as follows. The tristimulus values (X, Y, Z) of an expected color can be written as (8) where (A, B, C, D) are the indices of primary colors, (X {A, B, C, D} , Y {A, B, C, D} , Z {A, B, C, D} ) are the tristimulus values of each primary, and (a, b, c, d) are the digital-code values of each subpixel. When a = b = c = d = v max , where v max is the maximum digital-code value, the output tristimulus values represent a white point at (X W , Y W , Z W ).…”

“…Multi-primary-color (MPC) displays, which consist of additional subpixels besides the conventional primaries of red, green, and blue (RGB), is clearly one of the biggest achievements. [2][3][4][5][6][7][8][9] It is well known that MPC displays can produce a much wider color gamut with higher efficiency than conventional RGB-based display devices. In this paper, we review our recent achievements in MPC display technologies and show that its color reproducibility is not the only benefit.…”

30.2: Invited Paper: Advancements in Inkjet Printing for OLED Mass Production

“…While this technique has been successful in the mass production of mobile OLED displays, it has proven challenging to apply the same technique to large size OLED TVs, as the FMM approach when applied to large displays is expensive (due to low material efficiency, high equipment costs, and low equipment productivity), low yielding (due to particle contamination), and difficult to scale to the large glass sizes needed for TV mass production (due to FMM mask manufacturing and handling), e.g. G8 mother glass, with dimensions of 2.5 m by 2.2 m. Some manufacturers have focused on an alternative technique in which an unpatterned white emitting OLED structure is combined with conventional R, G, B color filters [3,4]. While this technique avoids the inherent difficulties of large size FMM processing, new challenges are introduced as a consequence of a more complex (and therefore higher cost) device structure (due to the more complex white OLED device stack and the addition of the color filter mask levels) and the decreased brightness/efficiency of the display (as a result of the color filter losses).…”