Abstract
In this paper, a pixel circuit comprising four p-channel mosfets and one capacitor is proposed for a high-resolution organic light emitting diode on silicon microdisplays with high luminance uniformity. The proposed pixel circuit improves the luminance uniformity by compensating for the threshold voltage
$\rm{(V}_{\rm{th}}\rm{)}$
variation of the driving transistors. In addition, it extends the data voltage range to precisely control the emission current
$\rm{(I}_{\rm{em}}\rm{)}$
. The test pattern of the proposed pixel circuit is fabricated on a single-crystalline silicon wafer as a backplane using a 90 nm CMOS process and occupies a subpixel area of 3 μm × 9 μm, corresponding to a resolution of 2822 pixels per inch. To verify the performance of the proposed pixel circuit,
$\rm{I}_{\rm{em}}$
is measured from 24 fabricated test patterns. When the
$\rm{V}_{\rm{th}}$
variation is not compensated for, the deviation of the measured
$\rm{I}_{\rm{em}}$
ranges from –17.48% to +14.40% with a deviation of
$\rm{V}_{\rm{th}}$
from –7.19 mV to +7.19 mV. On the other hand, when the
$\rm{V}_{\rm{th}}$
variation is compensated for, the deviation of the measured Iem only ranges from –1.63% to +1.15%. Moreover, the proposed pixel circuit extends the data voltage range up to 1.289 V, which is 1.81 times wider than the source-to-gate voltage of the driving transistor which generates the maximum
$\rm{I}_{\rm{em}}$
. In addition, the maximum organic light-emitting diode luminance of the proposed pixel circuit is constantly maintained between 292.5 and 303.8 cd/m2 in the temperature range of –45 °C to 60 °C.
© 2016 IEEE
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