Rgb led backlight of color sequential display with precise current-balance control technique

Chia Lin Chiu; Yu Huei Lee; Chun Yu Hsieh; Ming Tsung Ho; Ke-Horng Chen; Ling Li; Chih Chung Chen

doi:10.1889/1.3256863

Rgb led backlight of color sequential display with precise current-balance control technique

Chia Lin Chiu, Yu Huei Lee, Chun Yu Hsieh, Ming Tsung Ho, Ke-Horng Chen, Ling Li, Chih Chung Chen

National Chiao Tung University

Research output: Contribution to journal › Conference article

1 Scopus citations

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 (△ V_CH) 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
Pages (from-to)	644-648
Number of pages	5
Journal	Digest of Technical Papers - SID International Symposium
Volume	40
Issue number	1
DOIs	https://doi.org/10.1889/1.3256863
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

Access to Document

10.1889/1.3256863

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Cite this

Chiu, C. L., Lee, Y. H., Hsieh, C. Y., Ho, M. T., Chen, K-H., Li, L., & Chen, C. C. (2009). Rgb led backlight of color sequential display with precise current-balance control technique. Digest of Technical Papers - SID International Symposium, 40(1), 644-648. https://doi.org/10.1889/1.3256863

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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.",

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