© The Institution of Engineering and Technology
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.
References
-
-
1)
-
2. Cho, H.S., Kwon, O.-K.: ‘A backlight dimming algorithm for low power and high image quality LCD applications’, IEEE Trans. Consum. Electron., 2009, 55, (2), pp. 839–844, (doi: 10.1109/TCE.2009.5174463).
-
2)
-
5. Kang, J.-S., Kim, J-H, Kim, S-Y, et al: ‘10 bit driver IC using 3 bit DAC embedded operational amplifier for spatial optical modulators (SOMs)’, IEEE J. Solid-State Circuits, 2007, 42, (12), pp. 2913–2922, (doi: 10.1109/JSSC.2007.908690).
-
3)
-
4. Yoon, J.S., Lee, Y.H.: ‘Organic light emitting diode display device and method of driving the same’. , March2014.
-
4)
-
1. Nam, H.: ‘Low power active dimming liquid crystal display with high resolution backlight’, Electron. Lett., 2011, 47, (9), pp. 538–540, (doi: 10.1049/el.2011.0258).
-
5)
-
3. Kwon, O.S., Park, T.Y, Ha, Y.H.: ‘High fidelity color reproduction of plasma displays under ambient’, IEEE Trans. Consum. Electron., 2009, 55, (3), pp. 1015–1020, (doi: 10.1109/TCE.2009.5277949).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.0669
Related content
content/journals/10.1049/el.2015.0669
pub_keyword,iet_inspecKeyword,pub_concept
6
6