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A video-speed reflective display based on electrowetting

A video-speed reflective display based on electrowetting. Contents. Electrowetting introduction Display properties Video-speed response High brightness color option Conclusions. Video on electric manipulation of liquids. Click on graphic below for video on Switching Droplet.

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A video-speed reflective display based on electrowetting

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  1. A video-speed reflective display based on electrowetting

  2. Contents • Electrowetting introduction • Display properties • Video-speed response • High brightness color option • Conclusions

  3. Video on electric manipulation of liquids Click on graphic below for video on Switching Droplet Switching droplet illustrating the basic electrowetting action

  4. water V oil V coating electrode Homogeneous oil film Oil pushed aside Electrowetting display principle

  5. Video on oil motion control Click on graphic below for video clip Top view showing oil motion control with segmented electrodes

  6. Electrowetting display fabrication PET frame water glass (or PET)/ITO edge seal V photolithographic wall (~5 um) oil film active plate + fluoropolymer insulator

  7. Electro-optic characteristics 1.0 Reflectivity (%) -20 V 0.5 0 V 0.0 400 500 600 700 Wavelength (nm) 500x500 mm2 pixel 15 mm magenta oil D(0) measurement

  8. t on R max ton = 12 ms toff = 13 ms t off Video speed response time 250x250 mm2 15 mm oil - 30 V on Normalized Reflectivity off 0 V R min 0 5 10 15 20 25 30 Time (ms)

  9. Video on the video-speed response Click on graphic below for video clip. Video speed response of a 10x30 array of 100 dpi pixels (240x80 μm2)

  10. 2nd Addressable oil layer PET frame water edge seal V2 50 mm V1 active plate + fluoropolymer insulator photolithographic wall (~5 um) oil film Two independent switches in one cell

  11. Colour filter Oil layer 2 Oil layer 1 High brightness color option • Essential ingredients • subtractive colors • 3 subpixels Brightness = 4x LCD!

  12. Cyan Yellow Subtractive color arrays Magenta 5 um pixel walls 80 um 250 um

  13. Demonstration of bi-layer switching V V V V Resulting pattern Click on graphic below for video clip. 5 mm Demonstration of color concept in single pixel with line electrodes

  14. Advantages of reflective electrowetting display • Video speed response (<10 ms) • High brightness color option (4xLCD) • Well suited for high resolution (now 160 dpi) • Good intrinsic properties for flexible display • (no cell-gap dependence) Paper-like look and feel possible

  15. Conclusions Electrowetting is a very promising reflective display technology thanks to: • Video speed response • High brightness for all colors • High contrast Click on graphic for video clip.

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