TY - GEN
T1 - Microcontroller-based backlight module with DPLL function for reducing the parasitic capacitance effect in LCD panel housing
AU - Lin, Chang Hua
AU - Pai, Kai Jun
AU - Wang, Chien Ming
N1 - Funding Information:
The work of the author was supported in part through ROC National Science Council Grants NSC84-2213-E005-009 and NSC85-2213-E-005-001.
PY - 2008
Y1 - 2008
N2 - A microcontroller-based backlight module is proposed to reduce the leakage current effect in LCD. First, the mathematical model of the parasitical capacitance in LCD panel is conducted to explore the influence of leakage current effect. Moreover, a class D resonant backlight inverter is employed to act as the main circuit. Next, the phase angle variations caused by the parasitic capacitances is considered as a reference parameter in the proposed control strategy. By using the primary-side control and incorporating the DPLL function programmed by software to form a feedback mechanism to track the optimal operating frequency. And then the influence of parasitic capacitance can be reduced so as to eliminate the leakage current effect, hence, the system efficiency and stability will be improved. Complete mathematical analysis and design considerations are detailed. Experimental results agree with the theoretical predictions.
AB - A microcontroller-based backlight module is proposed to reduce the leakage current effect in LCD. First, the mathematical model of the parasitical capacitance in LCD panel is conducted to explore the influence of leakage current effect. Moreover, a class D resonant backlight inverter is employed to act as the main circuit. Next, the phase angle variations caused by the parasitic capacitances is considered as a reference parameter in the proposed control strategy. By using the primary-side control and incorporating the DPLL function programmed by software to form a feedback mechanism to track the optimal operating frequency. And then the influence of parasitic capacitance can be reduced so as to eliminate the leakage current effect, hence, the system efficiency and stability will be improved. Complete mathematical analysis and design considerations are detailed. Experimental results agree with the theoretical predictions.
KW - Backlight inverter.
KW - DPLL
KW - Leakage current effect
KW - Microcontroller-based
KW - Parasitic capacitance
UR - http://www.scopus.com/inward/record.url?scp=54549127450&partnerID=8YFLogxK
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U2 - 10.1109/ICIT.2008.4608394
DO - 10.1109/ICIT.2008.4608394
M3 - Conference contribution
AN - SCOPUS:54549127450
SN - 9781424417063
T3 - Proceedings of the IEEE International Conference on Industrial Technology
BT - 2008 IEEE International Conference on Industrial Technology, IEEE ICIT 2008 - Conference Proceedings
T2 - 2008 IEEE International Conference on Industrial Technology, IEEE ICIT 2008
Y2 - 21 April 2008 through 24 April 2008
ER -