The organic light emitting diode display (O LED) will bring a revolutionary change to the display industry in emerging technologies. The organic materials used in OLEDs emit light when current flows, and OLEDs have many advantages over current LCD technologies. One of the advantages is that it is easy to manufacture and ultimately results in a lower cost display. Performance benefits include faster response times, wider viewing angles, lower power consumption, and brighter/higher contrast images. The core advantage is that OLEDs use a self-illuminating technology and therefore do not require a backlight. This not only saves power, but also enables displays with a thickness of only 1mm.
Similar to LCD displays, OLED displays are available in both passive matrix and active matrix configurations. When a passive matrix is ​​used, the displays are connected into a diode grid, with each diode forming a separate OLED pixel. An external drive circuit can be used to illuminate a row of grids at once. In contrast, an active matrix display contains transistors, and pixels can be continuously illuminated. However, unlike OLEDs, OLEDs use a current-driven matrix mode, which increases the complexity of active matrix design. Therefore, high-volume OLEDs still use passive matrix products (PMOLEDs). These PMOLEDs can be used in a variety of devices, including cellular phones, car stereos, MP3 players and other consumer products.
OLED display power supply
Since many OLED displays are currently used in portable applications, power consumption is particularly important. Any power chip must work at peak efficiency to save power and extend battery life, especially when the display is not working.
The power requirements of OLED displays are related to many factors. Since the display is current driven, the peak current requirement depends on the total number of pixels that are illuminated at the same time and the maximum current value that drives them. The display driver circuit also consumes part of the current. The voltage requirements depend on the forward voltage drop of the diode, the voltage drop across the internal interconnect of the display (often resistive), and all the voltage drops required for the display driver (see Figure 1).
In this example, the maximum voltage required is given by the following formula:
Where: V diode is the forward voltage drop of the diode; I diode is the current flowing through the diode; Rcol is the resistance of the column connection; Rrow is the resistance of the row metal; VCD is the overhead required by the column driver; VRD is required for the row driver Overhead; in a typical application, VIN is approximately 20V.
Electronic Components Resistor
Resistor (Resistor) commonly known as resistance directly in our daily life.It is a current limiting element. When the resistance is connected to the circuit, the resistance value of the resistor is fixed, usually two pins.Fixed resistors are those whose resistances cannot be changed.Resistance variable is called potentiometer or variable resistor.The ideal resistor is linear, that is, the instantaneous current through the resistor is proportional to the applied instantaneous voltage.Variable resistor for partial pressure.On the exposed resistor body, one or two movable metal contacts are pressed tightly.The contact position determines the resistance between any end of the resistance body and the contact.
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