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A video-speed reflective display based on electrowetting

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A video-speed reflective display based on electrowetting - PowerPoint PPT Presentation


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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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Presentation Transcript
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

slide6

Electrowetting display fabrication

PET frame

water

glass (or PET)/ITO

edge seal

V

photolithographic wall (~5 um)

oil film

active plate +

fluoropolymer insulator

slide7

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

slide8

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)

slide10

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!

slide12

Cyan

Yellow

Subtractive color arrays

Magenta

5 um pixel walls

80 um

250 um

slide13

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

slide14

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

slide15

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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