Abstract
A new proposed compensation driver circuit of flat-panel display (FPD) based on organic light emitting diodes (OLEDs) and on poly-crystalline silicon thin-film transistors (poly-Si TFTs) is presented. This driver circuit is developed for an active-matrix organic light-emitting-diode (AMOLED) display and its efficiency is verified compared with the conventional configuration with 2 TFTs. According to results, this circuit is suitable to achieve acceptable level for power consumption, high contrast, maximum gray levels, and better brightness. And, to show this, a stable driving scheme is developed for circuit with much compensation such as against the data degradation, the threshold voltage dispersions of TFT drive, and suppression of TFT leakage current effect.
Highlights
The new generation of display, organic electronic display, based on organic light emitting diodes (OLEDs) has established to eliminate the defects reported for the other technologies (LCD and PLASMA): low contrast and high consumption [1, 2] with speed conditions that may be unacceptable for some displays of 3 dimensions due to addressing type
There is an increase in the contrast ratio by inserting the transistor TFT6 as the OLED is disconnected from another part of the circuit during the initialization and compensation phase, so it does not emit light during the addressing phase, and a perfect black colour is displayed
A new compensation driver circuit based on the technology thin film transistor (TFT) polycrystalline silicon (poly-Si) as a support of the organic matrix thanks to its speed and its thermal stability is proposed with its driving scheme, consisting of 6 transistors TFTs and having three input lines plus one storage capacitance
Summary
The new generation of display, organic electronic display, based on organic light emitting diodes (OLEDs) has established to eliminate the defects reported for the other technologies (LCD and PLASMA): low contrast and high consumption [1, 2] with speed conditions that may be unacceptable for some displays of 3 dimensions due to addressing type. For both types of circuits at the driving scheme, the variations in threshold voltage of TFTs, due to the change in mobility under the influence of operating time and under abnormal thermal conditions which can attain, respectively, 10% to 50%, the data degradation, and the change in supply voltage, the leakage current [9], and the speed, generate degradation and nonuniformity in brightness over time in the pixel itself and in many cases there is a fluctuation in brightness in the surrounding pixels These disturbances add up over time and may be the cause of poor vision. Generally we can say that the choice of one of these transistors is closely related to the manufacture which has its own parameters and its driving schemes and the technology used to make the AMOLED screen
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