An optically efficient full-color reflective display with an electrochromic device and color production units

Abstract

In this paper, we report a full-color reflective display device by combining reflective electrochromic device (ECD) and different color production units (conventional color filter (CF) and transmittance controllable electrochromic color filter (TCECF)). A full-color reflective device with TCECF showed an excellent diffuse reflectance of 47.2% in the white state owing to the high transmittance of TCECF in the bleached state than that of CF (19.5%). This device structure can easily provide various colors with high brightness and saturation with a broad grayscale. Particularly, in the colored state, TCECF and CF-based full-color reflective device displayed color coordinates of (0.59, 0.34), (0.31, 0.66), (0.24, 0.30) and (0.65, 0.33), (0.27, 0.61), (0.15, 0.06), for red, green and blue, respectively, and alongside also exhibited color gamut of 36.8% (for TCECF) and 73.1% (for CF) for full color reflective devices.ARTICLE HISTORY His research interests include the development of new organic materials for optoelectronic devices including OLEDs, QD-LEDs, OPV, and electrochromic devices. He has authored/co-authored over 145 SCI-indexed papers and also has about 98 registered patents (national and international).

Influence of ALD-Al2O3 film on anti-scratch and anti-tarnish of silver

“…Unlike the sample in which opaque colour is determined from reflectance of light, the transparent colour of the film is determined by transmission of light [15]. Such uneven transmittance has caused the films to have a yellow tint, which is enhanced as the film thickness increases.…”

Emerging Electrochromic Materials and Devices for Future Displays

“…Can colorful EC pixel displays be realized with color filters? Based on this question and innovative concept, Jang H. Kwon et al reported full-color reflective displays based on the RGB color mode, which included both a color filter (CF) and a transmittance controllable EC color filter (TCECF) . The utilized CF and TCECF could selectively transmit visible light, and a black ECD was used to turn the pixels on/off to show the corresponding colors.…”

“…reported full-color reflective displays based on the RGB color mode, which included both a color filter (CF) and a transmittance controllable EC color filter (TCECF). 373 The utilized CF and TCECF could selectively transmit visible light, and a black ECD was used to turn the pixels on/off to show the corresponding colors. In addition, EC leuco dye derivatives with multiple colors (red, green, and blue) were induced in the display to replace the CFs for a higher diffuse reflectance.…”

Fabrication of Type-Variable Electronic Paper Using Electrophoretic Particle Loading with Multiple Bottom Electrode Structure

“…It does not require a backlight and has a wide viewing angle and memory that retains image information even when the power is turned off [ 4 , 5 , 6 , 7 ]. Recently, various products such as e-books, billboards, information boards, Electronic Shelf Labels (ESLs), and Points of Purchase (POPs) have been developed using e-paper due to its many advantages, such as easy readability [ 8 , 9 , 10 ]. While these advantages meet all the requirements of an ideal display, it is difficult to achieve them in a color display [ 11 ].…”