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In this paper, the new smart dimming algorithm which is mixed with PWM and PAM control method is proposed for reducing the power consumption of LED TV Backlight. The proposed technique is using the curve characteristics of LED forward voltage and current which is proportionally changing LED forward voltage as changing LED forward current. Therefore, each PWM and PAM control method has different LED forward voltage and current in the same brightness condition. The PWM control method adjusts the brightness of LED TV Backlight by only varying the duty ratio of PWM and constantly sustaining the amplitude of LED forward current and voltage. So, the level of LED forward current and voltage in the PWM control method is relatively high and constant regardless of duty ratio of PWM. On the other hand, the PAM control method adjusts the brightness of LED TV Backlight by directly varying the level of LED forward current. So, the level of LED forward current and voltage in the PAM control method is lowered according to the brightness level. For the above-mentioned reason, the PAM control method has the advantage of reducing the total power consumption of LED TV Backlight at the brightness condition of below 100%, compared with PWM control method. By implementing this characteristic to LED driver circuit with control algorithm in MCU, the power consumption of LED TV Backlight can expect to be reduced. The effectiveness of the proposed method, new smart dimming algorithm, CPWAM(=Conditional Pulse Width Amplitude Modulation), has been verified by experimental results.
목차
Abstract
1. 서론
2. 휘도 조절방식
3. 제안된 CPWAM 알고리즘
4. 실험 결과
5. 결론
References
참고문헌 (8)
참고문헌 신청
1. [학술대회논문] - Mu-Shen Lin / 1998 / A Cold-Cathode Fluorescent Lamp Driver Circuit with Synchronous Primary-Side Dimming Control / IEEE Transactions on Industrial Electronics 45 (2) : 249 ~ 255
2. [학술대회논문] - Chang-Hua Lin / 2005 / The Design and Implementation of a New Digital Dimming Controller for the Backlight Resonant Inverter / IEEE Transaction on Power Electronics 20 (6) : 1459 ~ 1466
3. [학술대회논문] - Prathyusha Narra / 2004 / An Effective LED Dimming Approach / proceeding of IAS 3 : 1671 ~ 1676
4. [학술지(정기간행물)] - 홍성수 / 2010 / A New Cost-Effective Current-Balancing Multi-Channel LED Driver for a Large Screen LCD Backlight Units / Journal of Power Electronics 10 (4) : 351 ~ 356
5. [학술대회논문] - S. W. Lee / 2001 / Simplified control technique for LCD backlight inverter systems using the mixed dimming method / Proceeding of APEC : 447 ~ 453
2. [학술대회논문] - Chang-Hua Lin / 2005 / The Design and Implementation of a New Digital Dimming Controller for the Backlight Resonant Inverter / IEEE Transaction on Power Electronics 20 (6) : 1459 ~ 1466
3. [학술대회논문] - Prathyusha Narra / 2004 / An Effective LED Dimming Approach / proceeding of IAS 3 : 1671 ~ 1676
4. [학술지(정기간행물)] - 홍성수 / 2010 / A New Cost-Effective Current-Balancing Multi-Channel LED Driver for a Large Screen LCD Backlight Units / Journal of Power Electronics 10 (4) : 351 ~ 356
5. [학술대회논문] - S. W. Lee / 2001 / Simplified control technique for LCD backlight inverter systems using the mixed dimming method / Proceeding of APEC : 447 ~ 453
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