Hua-Chi Cheng

54.1: Invited Paper: A Novel Approach to Make Flexible Active Matrix Displays

A flexible thin film transistor (TFT) backplane was successfully developed with Polyimide (PI) substrate and a novel de-bonding technology. The PI is colorless and transparent which can sustain a process temperature of 200°C. with this progress, flexible organic light emitting diode (OLED) and electrophoretic display (EPD) can readily be integrated with flexible TFT backplane to fabricate flexible AMOLED and flexible AMEPD.

22.3: A Reflective‐Type Carbon Nanotube Field Emission Display

A 3.5-inch, 60×120 pixels, reflective-type carbon nanotube emitter field-emission display has been fabricated by thick-film process. A seven-segment numerical indicator showing digit image was also demonstrated using opposed diode structure as comparison. The technical development, including design and fabrication of the nanotube emitters, phosphor, and vacuum package process was described.

24.4: Planar Triode Structure Carbon Nanotubes Field Emission Display

A new planar triode structure of CNT-FED has been fabricated. The gate electrode and the CNTs emitters were almost on the same plane. The gate pulls out the electrons from the both side CNTs emitters. The electron beam would be focus on the top of the gate electrode.

P‐46: Color Carbon Nanotube Field Emission Display

A 10-inch, 240 ×320 pixels, triode structure color carbon nanotube field emission display (CNT-FED) was fabricated after screen printing, photolithography and vacuum sealing process. The new normal on driving method was applied in triode CNT-FED, and the resolution was improved better than normal off FED.

43.3: A Novel Flexible AMOLED with Touch Based on Flexible Universal Plane for Display Technology

A flexible thin film transistor (TFT) backplane, OLED, and the flexible projective capacitive touch sensing film were successfully developed and integrated with colorless and transparent Polyimide (PI) substrate for the first flexible touch AMOLED display based on the flexible universal plane for display (FlexUPD) technology. This unique substrate handling technology is not only compatible with the current TFT manufacturing facilities but also allows us to use the same design rule of TFT backplane as that on the glass.

Low-cost fabrication of triode structure carbon nanotube field emission display

A triode structure carbon nanotube field emission display (CNT-FED) was fabricated by screen printing and sandblasting process.

Field emission display using carbon nanotubes as emitters

A fully sealed field emission display (FED), indicator, using carbon nanotubes (CNTs) as emitters is examined. The CNTs chunk, synthesized by arc discharge, were crushed, mixed with conductive pastes and then screen-printed on glass for the cold cathode. And the anode plate, an ITO glass printed P15 phosphor, was separated from cathode using 90 micrometers spacers. The indicator display performed a turn-on voltage as low as 250 V, and the emission current density 2.2 mA/cm2 under 300 V with brightness of 500 nits. The pixels, driven by open drain IC with 5 V gate voltage, showed the clock image which indicated the application of CNTs-FED. No significant degradation of this performance was observed during 1000 mins testing. The influence of printing condition and surface treatment process on the emission characteristics will also be discussed in this letter.

Field emission characteristics of carbon nanotube emitters using screen-printing technique

A carbon nanotube emitter with high uniformity, adhesion and emission current has been formed by screen printing. The raw carbon nanotubes (CNTs) chunk were crushed, purified, dispersed, mixed with organic additives and then screen printed on Ag electrode. After burning out the organic additives under two thermal cycles, the surface of CNTs emitters were treated. The treated emitters showed a better emission characteristic than untreated emitters.