Generalized Modeling of Bias Voltage Compensation with Current Control for Full-Color LED Display Based on Load-Line Regulation

Jian-Long KUO
Tsung-Yu WANG
Tzu-Shuang FANG

IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.10    pp.1418-1426
Publication Date: 2006/10/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.10.1418
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Electronic Displays)
load line,  bias voltage compensation,  current control,  full-color LED display,  driver circuit,  

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To give comprehensive and consecutive understanding about load line regulation in the previous companion paper [1], more generalized expansion and theoretical derivation will be proposed in this paper. The paper provides an alternative current control approach to control the bias voltage compensation for full-color LED display based on the load-line approach. Modeling and formulation of the driver circuit system will be discussed in detail. Bias voltage compensation based on three load-lines regulation will keep the operating point fixed for the three color cells. Many properties can be observed based on the proposed model. Parasite effect such as the stray resistor and the stray capacitor will be considered in this paper. The associated standard RGB color testing for color cells and white color testing will be illustrated to verify the proposed compensation for the display driver circuit. The objectives of the luminance uniformity and the gray scale control can be achieved by using circuit approach. It is believed that this paper will be helpful to the driver circuit technology for the full-color LED display.