Roll the presses - mylar clear plastic
Ian sampleelectronics is printed on curved plastic sheets with rubber rollers.
Using this technology, scientists print a flexible electronic display that works even if it is bent or rolled up.
"You can put these in your cereal box so that when you have breakfast in the morning, you can read the sports results of the day before," said John Rogers from Bell Labs, Lucent technology.
"Or you can reconfigure the wallpaper to a different design.
You can even make them into clothes.
The "rubber print" screen may be more attractive than the existing screen, Rogers said.
"Because they are light and made of flexible plastic, they are unlikely to break down if you put them down," he said . ".
The way information is displayed on the screen makes their power consumption very low.
To demonstrate the technology, the team produced a black and white display with 256 pixels.
But chemist Ralph nuzo of the University of Illinois says that if the polymer transistors used in the display are to compete with the best transistors produced by the current optical printing plant, improvements are needed.
"In this demonstration, the performance of the transistor will certainly not be close to the most advanced silicon devices," he said . ".
He also said that because the rubber roller is square, the printing accuracy is difficult to control.
To demonstrate, Rogers works with colleagues at E-Ink, a Cambridge, Massachusetts company that produces e-ink.
First, they took a thin Mela film that was used to make overhead clear film for the projector.
At this point they made a grid
Called the "gate electrode" to switch the electronic circuit at the top.
Next, the researchers added an insulating layer and a thin gold coating.
The gold surface is stamped with a silicone rubber seal printed with a circuit design pattern to form a large number of fine gold electronic connections.
The plastic ink in the stamp groove protects the connection while the rest of the gold is etched.
Boiling ink by gentle heating reveals the gold circuit.
In order to complete the plastic transistor circuit required for the display, the spots of the plastic semiconductor are deposited on the paper.
After the circuit layer was completed, Rogers added an electronic ink called "electronic ink ".
This is a small and transparent plastic bead, each with black ink and charged white particles.
"If you charge on the beads, you can attract white particles to the back of the beads, so the pixels look black," Rogers said . ".
"Then, when you switch the voltage, you force the white particles to the front so you can switch between black and white using these plastic transistors," he said . ".
"There are ways to make colors.
The rubber stamping circuit could end up like the current newspaper, leading to continuous display scrolling, Rogers said.
This will make the production cost of the circuit much lower-very expensive machines are needed at the moment. Source:
Journal of the National Academy of Sciences (vol 98, p 4835)
National Academy of Sciences (Volume 1, p. 4835)