8th week - lecture by Mr. Rasli

Do you know what is the difference between device and system ?

let me tell you :)

device : electronic component such as personal computer hardware.

system : combination of components to do a work .

On the other words , Mr.Rasli said ,

" Devices make a system "

then, Mr. Rasli discuss about electron device :)

ELECTRON DEVICE .

• electron device is the electrical conduction that conducts electrons movement through vacuum,gas, and semiconductor.
• electron carry the current to moves.
• electron current ,moves from negative terminal to positive terminal.
• conventional current, moves from positive terminal to negative terminal.

Mr. Rasli discussed 5 topics which is :

1. Basic electronic components.
2. OLED
3. FPGA
4. Power electronics
5. Integrated circuit (IC)

1. BASIC ELECTRONIC COMPONENTS .

We had discussed about this before . Mr. Redzuan had explained briefly about electronic components such as resistors, capacitors, diode, integrated circuit, transistors.

2. OLED

It's new to us right ?

An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissiveelectroluminescent layer is a film of organic compounds which emit light in response to an electric current. This layer of organic semiconductor material is situated between two electrodes. Generally, at least one of these electrodes is transparent.

There are two main families of OLEDs: those based on small molecules and those employing polymers. Adding mobile ions to an OLED creates a Light-emitting Electrochemical Cell or LEC, which has a slightly different mode of operation. OLED displays can use either passive-matrix(PMOLED) or active-matrix addressing schemes. Active-matrix OLEDs (AMOLED) require a thin-film transistor backplane to switch each individual pixel on or off, but allow for higher resolution and larger display sizes.

An OLED display works without a backlight. Thus, it can display deep black levels and can be thinner and lighter than liquid crystal displays (LCDs). In low ambient light conditions such as dark rooms an OLED screen can achieve a higher contrast ratio than an LCD, whether the LCD uses either cold cathode fluorescent lamps or the more recently developed LED backlight. Due to their low thermal conductivity, they typically emit less light per area than inorganic LEDs.

APPLICATIONS

OLEDs are used in television set screens, computer monitors, small, portable system screens such as mobile phones and PDAs, watches, advertising, information, and indication. OLEDs are also used in large-area light-emitting elements for general illumination.

ADVANTAGES

Lower cost in the future

OLEDs can be printed onto any suitable substrate by an inkjet printer or even by screen printing, theoretically making them cheaper to produce than LCD or plasma displays. However, fabrication of the OLED substrate is more costly than that of a TFT LCD, until mass production methods lower cost through scalability. Roll-roll vapour-deposition methods for organic devices do allow mass production of thousands of devices per minute for minimal cost, although this technique also induces problems in that multi-layer devices can be challenging to make due to registration issues, lining up the different printed layers to the required degree of accuracy.

Light weight & flexible plastic substrates

OLED displays can be fabricated on flexible plastic substrates leading to the possibility of flexible organic light-emitting diodes being fabricated or other new applications such as roll-up displays embedded in fabrics or clothing. As the substrate used can be flexible such as PET, the displays may be produced inexpensively.

Wider viewing angles & improved brightness

OLEDs can enable a greater artificial contrast ratio (both dynamic range and static, measured in purely dark conditions) and viewing angle compared to LCDs because OLED pixels directly emit light. OLED pixel colours appear correct and unshifted, even as the viewing angle approaches 90° from normal.

Better power efficiency

LCDs filter the light emitted from a backlight, allowing a small fraction of light through so they cannot show true black, while an inactive OLED element does not produce light or consume power.

Response time

OLEDs can also have a faster response time than standard LCD screens. Whereas LCD displays are capable of between 2 and 8 ms response time offering a frame rate of ~200 Hz, an OLED can theoretically have less than 0.01 ms response time enabling 100,000 Hzrefresh rates.

the example of OLED

3. FPGA

• Field Programmable Gate Array
• it is one type of IC which has a huge amount of components.
• structured with a lot of tiny blocks of logic with flip flops ( logic function )
• large digital design
• compile the logic using software to create binary file then download it .

this is the picture of FPGA

4. POWER ELCTRONICS

power elctronics is the applications of solid state electronics for the control and conversion of electric power.

5. INTEGRATED CIRCUIT ( IC )

integrated circuit (IC) is defined as huge discrete elements are compressed in one singlenchips of silicon .

see you next entry :)