Dual Color OLED Display: Introduction, Mechanism & Advantages

Dual-color OLEDs are helpful in applications where clients expect ultra-small displays with high contrast imaging. These displays do not have any backlight to illuminate pixels.

AMOLED and PMOLED are the two types of OLEDs. PMOLED is considered easy-to-manufacture, cost-friendly, and used in small-scale applications, whereas AMOLED is more advanced and used in large-scale applications.

Dual-color OLED, better known as PMOLED, uses a simple control scheme where it uses limited color lines to eliminate one line of pixels at a time. The size of PMOLED displays ranges between 1 to 5.5 inches. The background color of PMOLED is always black, but the pixels can be used in different sets of colors, including amber, blue, green, sky blue, white, and yellow. Determination of display colors is limited in PMOLEDs.

AMOLED uses an RGB color scheme which allows it to display in entire colors and high resolution. It is the reason why AMOLEDs find large-scale applications.

Mechanism

A PMOLED is formed using several layers of anode and cathode. It uses these layers to control the rows in the display and emit light over intersecting points in sequential order. It does not have a capacitor which is why most of the lines in the collection are off most of the time when pixels in other colors illuminate.

Passive matrix OLEDs follow the passing driving method, which increases the demand for high current supply. Dual color OLED displays have been a preferred LED alternative for consumers seeking small-scale displays with high contrast.

Advantages

Dual-color PMOLED displays have become more popular by getting tough competition to the passive matrix LCDs in higher contrast, easy manufacturing, affordability, and mechanism. Despite fewer features than AMOLEDs, PMOLEDs have secured their dedicated customer base in the market.

Some of the reasons for the rise of PMOLEDs or their advantages are;

• High contrast ratio (20000:1)
• Viewable from any angle
• More energy-efficient than LCD and LED as most of the pixels remain inactive
• Easily deployable in low-power & small scale applications

The PMOLEDs can be used in music players, wearables, computers, healthcare equipment, electronic devices, etc. The main limitations of PMOLEDs are the size and resolution they cover. Manufacturers are developing dual-color OLED displays operating on considerably low power.

Microtips, a leading electronics company in the United States, has developed its dual color OLED display with less than an inch diagonal. The product sized 0.96 inches uses yellow/sky blue color displays. It is operable on the power supply of 3V/5V.