Flexible Reflective Color Displays using Thermochromic Pigments

Abstract

This research presents a flexible reflective thermochromic display (TCD) comprised of thermochromic pigments and a patterned indium tin oxide (ITO) film coated on a polyethylene naphthalate (PEN) substrate, and the display's thermo-optical characteristics. The display showed maximum red, green, and blue reflectances of 30%, 38%, and 29%, respectively. Furthermore, the display exhibited a continuous grey color when the temperature was changed continuously. As a flexible display, the display showed reliable thermo-optical performance without image damage even when highly bent. We expect the proposed TCD will be used in outdoor information display applications where low cost is a key factor.

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film†

“…Healthy eye-care display is becoming more and more important as individuals strive to live healthier lifestyles. More and more research is being done on RLCDs that eliminate backlight and use ambient light as the source of light because the blue band in LCD backlights is bad for human eyes [1][2][3][4][5][6][7][8][9] . The reflective metal in conventional RLCD cell serves as the reflective surface for RLCD, which typically modulates the light using 1/2λ and 1/4λ plate [1, 2 and 11] .…”

Printed thermochromic displays

“…When the heater is turned on or off, the display changes its content between two predefined four‐colour pictures. Heo and colleagues present flexible reflective thermochromic displays comprised of thermochromic pigments and a patterned indium tin oxide (ITO) film coated on a polyethylene naphthalate (PEN) substrate or glass substrate. The ITO films which were used as the heating material were sputtered to the material (glass or PEN), and later thermochromic inks (red, green and blue) were sprayed onto ITO.…”

Tunable thermochromic properties of V 2 O 5 coatings

“…This behaviour is observed in several types of compounds, ranging from organic molecules [4,5], inorganic compounds [6,7], organometallic [8,9], and transition metal oxides [10e12]. Due to the simplistic nature of temperature dependent colour changing ability, they are utilized in several devices like temperature sensor [13e15], information display [16,17], safety devices and food packaging [18,19]. Nevertheless, there has been a considerable interest in obtaining compounds with a control over the colour of the thermochromic materials.…”