access icon free Small-area DAC using adaptive body bias scheme for AMOLED data driver ICs

A small-area digital-to-analogue converter (DAC) using an adaptive body bias scheme is proposed for active-matrix organic light-emitting diode (AMOLED) data driver ICs. The proposed scheme adjusts the body bias applied to the P-type (PMOS) decoder according to the average picture level (APL) and maintains a low on-resistance of the PMOS decoder at a high APL. This enables reduction of the DAC area by realising the upper-half decoder using only PMOS switches, unlike conventional DACs which use both PMOS and N-type switches. A 20-channel data driver IC is fabricated using a 0.18 µm HVCMOS technology with 1.8 V/18 V devices. The proposed DAC occupies 33% less area than the conventional DAC and the measured differential nonlinearity and integral nonlinearity are +0.09/−0.1 and +0.36/−0.47 LSB, respectively.

Inspec keywords: integrated circuit design; digital-analogue conversion; organic light emitting diodes; driver circuits; CMOS integrated circuits; semiconductor switches

Other keywords: DAC; P-type decoder; voltage 18 V; APL; active-matrix organic light-emitting diode data driver IC; adaptive body bias scheme; PMOS decoder; voltage 1.8 V; AMOLED data driver IC; HVCMOS technology; PMOS switches; small-area digital-to-analogue converter; N-type switches; average picture level; size 0.18 mum

Subjects: Light emitting diodes; Power electronics, supply and supervisory circuits; Relays and switches; CMOS integrated circuits; Semiconductor integrated circuit design, layout, modelling and testing; A/D and D/A convertors; A/D and D/A convertors

References

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      • 4. Yoon, J.S., Lee, Y.H.:Organic light emitting diode display device and method of driving the same’. U.S Patent, number: 20140176625, March2014.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.0669
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