Abstract
This paper proposes an 8-bit grayscale AMOLED
driver IC with a mixed modulation DAC. This architecture maintains
a digital logic component, high-precision 8-bit compensated gamma
correction and an output amplifier buffer with low-complexity configuration
for the AMOLED display panel. The proposed driver IC with gamma correction
consists of a 6-bit resistor-string DAC and a 2-bit polynomial interpolation
current-modulation sub-DAC. The two-stage DAC leads to a more compact
die size than conventional 8-bit resistor-string DAC, and the polynomial
interpolation method provides higher accuracy gray level voltages
than linear methods. The source driver IC of the 240 RGB AMOLED display
was implemented in the 0.35
$\mu$
m CMOS process with a die area
of 2.95
$\times$
8.9 mm
$^{2}$
, including a digital core area of approximately 7.0
$\times$
1.0
mm
$^{2}$
. The DNL and INL of the proposed mixed modulation DAC are
of 0.43 LSB and, 0.4 LSB, respectively.
© 2015 IEEE
PDF Article
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