Organic Light-Emitting Diode OLED displays are made using organic light emitting diodes, which emit light when current runs through them. The basic colors of light for these diodes are Red, Green, and Blue RGB , which combine to create an extensive range of colors of visible light. Source: oled-info. LCDs require a backlight usually fluorescent or LED , and the light shows through the LCD to produce a color image on the display screen under the glass. PMOLED screens light up one row of pixels at a time, turning off the line as it moves to light the next row. Enter the plastic Manufacturers like Samsung, LG, and Sharp are now substituting plastic substrates for glass substrates, especially on smaller displays.
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Essentially, an active matrix addressing scheme involves attaching a transistor and capacitor to each diode or pixel to maintain the pixel state while addressing other pixels actively.
On the other hand, a passive matrix OLED does not control the pixels individually. In a passive matrix addressing scheme, each row and line containing pixels within the display is controlled sequentially and one-by-one. The pixels in each row or line are inactive most of the time.
However, they each have their respective pros and cons or benefits and drawbacks. The TFT backplane responsible for maintaining active pixel states and controlling pixels individually enables physically larger and high-resolution OLED displays. Meanwhile, PMOLED displays are usually smaller in size and lower in resolution because of the inherent disadvantage of the passive matrix addressing scheme. For starters, manufacturing a bigger PMOLED display means adding in more roes or lines that in turn, translate to higher voltage requirement.
Making sense of displays: OLED, AMOLED, POLED, PMOLED and T-OLED
AMOLED Display vs. PMOLED Display
How OLEDs Work