A video-speed reflective display based
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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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A video speed reflective display based on electrowetting

A video-speed reflective display based

on electrowetting


Contents

Contents

  • Electrowetting introduction

  • Display properties

    • Video-speed response

    • High brightness color option

  • Conclusions


Video on electric manipulation of liquids

Video on electric manipulation of liquids

Click on graphic below for video on Switching Droplet

Switching droplet illustrating the basic electrowetting action


Electrowetting display principle

water

V

oil

V

coating

electrode

Homogeneous oil film

Oil pushed aside

Electrowetting display principle


Video on oil motion control

Video on oil motion control

Click on graphic below for video clip

Top view showing oil motion control with segmented electrodes


A video speed reflective display based on electrowetting

Electrowetting display fabrication

PET frame

water

glass (or PET)/ITO

edge seal

V

photolithographic wall (~5 um)

oil film

active plate +

fluoropolymer insulator


A video speed reflective display based on electrowetting

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


A video speed reflective display based on electrowetting

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)


Video on the video speed response

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)


A video speed reflective display based on electrowetting

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


High brightness color option

Colour filter

Oil layer 2

Oil layer 1

High brightness color option

  • Essential ingredients

  • subtractive colors

  • 3 subpixels

Brightness = 4x LCD!


A video speed reflective display based on electrowetting

Cyan

Yellow

Subtractive color arrays

Magenta

5 um pixel walls

80 um

250 um


A video speed reflective display based on electrowetting

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


A video speed reflective display based on electrowetting

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


A video speed reflective display based on electrowetting

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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