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论文作者:留学生论文代写论文属性:硕士毕业论文 thesis登出时间:2011-05-27编辑:zn1987点击率:2723
论文字数:2106论文编号:org201105271117321844语种:英语 English地区:英国价格:$ 66
关键词:Low-power pixel circuitOptical
A 2.5-inch Low-power LTPS AMOLED
Display—using Clamped-Inverter Driving—for Mobile Applications
Abstract
We developed a 2.5-inch low-power LTPS AMOLED display, inwhich data driver and 留学生论文代写scan driver are integrated. The developedlow-power pixel circuit of this display contributes to panel powerconsumption of 350 mW at a luminance of 100 cd/m2 through acircular polarizer. We confirmed that the panel only suffers aslight temperature increase.
1. Introduction
It is well known that active-matrix organic light-emitting diode(AMOLED) displays are characterized by their thin shape,lightweight, high-speed response, and high contrast. Accordingly,the AMOLED display is one of the leading candidates for adisplay for mobile applications displaying moving images. Wepreviously developed a clamped-inverter driving methodcharacterized by continuous light-emitting time control, which isapplied by low-temperature poly-Si (LTPS) AMOLED displays toget good inter-pixel uniformity and peak-luminance characteristic.
Low-power consumption is an important characteristic for adisplay built in a mobile device, because most mobile devices aredriven by batteries, whose operation time on one charge is greatlyinfluenced by the power consumption of the display. A compactpanel size is also important because a panel built in a mobiledevice is housed in a small space in most cases. To achieve thiscompactness, ICs implemented on the panel need to be small or,preferably, should be eliminated.
We have developed a low-power AMOLED display panelintegrating all peripheral driving circuits inside as LTPS circuits.The pixel circuit of this panel utilizes continuous light-emittingtime control and analog voltage programming.
2. Low-power pixel circuit
Figure 1 shows the configuration of the proposed pixel circuitintegrated in an AMOLED display applying the clamped-inverterdriving method. This pixel circuit comprises a PMOS invertercomposed of a set consisting of a P-channel TFT and an organiclight-emitting diode (OLED), a reset switch Q1, a capacitor C,and a selector. The pixel circuit has four TFTs as each of theswitches Q1 to Q4 is formed using one TFT. The PMOS inverteris used because all current supplied from the power line V+ to theinverter is supplied to the OLED element so as to reduceunnecessary power consumption, while the selector is used so thatthe analog signal voltage supplied from the peripheral data driveris received per pixel at an arbitrary timing.
The operation of this pixel circuit is explained as follows. At the writing time, Q1 and Q2 are set to the ON state when a scan pulse is supplied. As a result, the differential voltage between the analog signal voltage on the data line and the threshold voltage in the PMOS inverter is stored in capacitor C. The analog-signal voltage on the data line is programmed in the pixel circuit through this operation. At other times, Q1 and Q2 are set to the OFF state
while Q3 is set to the ON state, and a triangular-waveform voltage, which converts https://www.51lunwen.org/liuxuelunwendx/the programmed voltage into the length of the light-emitting time, is supplied to the PMOS inverter.
6. References
[1] H. Kageyama, et al., Proceedings of SID'03, p.96 (2003).
[2] R.M.A. Dawson, et al., Proceedings of SID'99, p. 438 (1998).
[3] S.W.B. Tam, et al, Proceedings of IDW'02, p.243 (2002)
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