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Optica Publishing Group
  • Journal of Display Technology
  • Vol. 12,
  • Issue 10,
  • pp. 1057-1063
  • (2016)

A High Conversion Ratio Component-Efficient Charge Pump for Display Drivers

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In this paper, a scheme combining the advantages of both Dickson charge pump and Fibonacci charge pump has been proposed to output 30 V voltage for display driver integrated circuit applications. With only two external capacitors, it fits for small-sized package like smart card applications. The flying capacitors of Dickson charge pump were optimized and 2.3% of the chip size was saved. Meanwhile a highly precise and simple model for one-stage Fibonacci charge pump was utilized. By using RC charging theory, its voltage error can be limited within 0.02% and it is feasible for further efficiency optimization. Based on a 0.11 μm 1.5 V/6 V/32 V process, three different types of layouts for the built-in capacitors were fabricated to further optimize the chip size and their performance was compared. They enhance the flying capacitance by 6%, 26%, and 64%, respectively, compared with the traditional design. This design improves the maximum current drivability and the power efficiency is higher than 53%.

© 2016 IEEE

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