Abstract
This paper proposes a high efficiency and precise current balance circuit in parallel RGB Light Emitting Diodes (LED) channels for color filter-less panel display. The new technique not only enhances the current matching in each channel but also reduces the requirement of device numbers and external resistors. The error percentage of all channel LED currents can kept within 0.1% when the channel voltage has a voltage variation (△ VCH) around 1.1V. Furthermore, the proposed load dependent minimum drain voltage can effectively reduce the voltage drop across the precise current balance circuit. As a result, the efficiency of the LED driver can be improved.
Original language | English |
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Pages (from-to) | 644-648 |
Number of pages | 5 |
Journal | Digest of Technical Papers - SID International Symposium |
Volume | 40 |
Issue number | 1 |
DOIs | |
State | Published - 1 Jan 2009 |
Event | 2009 Vehicles and Photons Symposium - Dearborn, MI, United States Duration: 15 Oct 2009 → 16 Oct 2009 |
Keywords
- Field sequential color
- Minimum voltage detection
- Precise current balance