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43.3: RGB LED Backlight of Color Sequential Display with Precise Current‐Balance Control Technique
Author(s) -
Chiu ChiaLin,
Lee YuHuei,
Hsieh ChunYu,
Ho MingTsung,
Chen KeHorng,
Li Ling,
Chen ChihChung
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256863
Subject(s) - led circuit , backlight , resistor , rgb color model , current (fluid) , voltage , channel (broadcasting) , computer science , electrical engineering , electronic engineering , materials science , engineering , optoelectronics , liquid crystal display , short circuit , computer vision
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 (Δ 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.