Implementation of Active Touch Panel by Detecting Change in Rc Time Delay
|關鍵字:||薄膜電晶體;主動式觸控感測;RC 時間延遲;Thin Film Transistor;Active Touch Sensing;RC delay|
|摘要:||Solid-state lighting has attracted much attention due to advantages of compactness, high
efficiency and environmental friendliness. Organic light-emitting diodes (LEDs) exhibit
better potential in mass production in comparison of inorganic LEDs since they are flat light
sources, are compatible with flexible substrates and have cost-effective fabrication processes.
In this proposal, we will study highly power-efficient single-layered white organic LEDs
based on solid-state light-emitting electrochemical cells (LECs). In LECs, electrochemically
doped regions induced by spatially separated ions under a bias form ohmic contacts with
electrodes, giving balanced carrier injection, low operating voltages and consequently high
power efficiencies. However, carrier balance can not be easily achieved in single-layered
LECs and thus device efficiency is limited. Carrier balance of the devices will be optimized
by tuning the mixing ratio of electron and hole transport host materials in the emissive layer
or by doping a low-gap guest to trap the carrier with a relatively higher mobility.
Furthermore, thickness of the emissive layer will also be tuned to optimize device efficiency.
To further enhance the device efficiency in the forward direction, diffuser films will be
fabricated on the substrates to improve the light out-coupling efficiency.|
Touch screen panels (TSPs) have attracted much attention in various applications since the touch sensing technology can simplify the interface between human and products. The touch sensing technology has been well-developed currently, but it is limited to medium and small size. Although some touch sensing technologies are applied to large size TSPs, no competitive technology can effectively solve the difficulty in signal processing. Our group proposes a novel active touch sensing circuit differing to current touch sensing technology. It can be applied as the design of on-cell or in-cell type. Meanwhile, the simple architecture enlarges the aperture ratio of sensing pixel and decreases the influence on image quality as low as possible. The sensing signal is a significant current which can be read out easily by low cost ICs. The advantages of immunity to parasitic capacitance and device variation, along with the low operating power, make the proposed method particularly suitable for large size TSPs. In this project, a large size TSP based on our proposed circuit is expected to be developed. In the first year, the project is aimed to the development of small size TSP using our sensing circuit and the design of the peripheral circuits. In the second year, with the experience of the first year, the development of large size TSP is expected to be successfully completed via proper testing and well considering for the possible problems.