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Sequential Variable Bilevel Driving Approach Suitable for Use in High-Color-Precision LED Display Panels
2012 / IEEE
This item was taken from the IEEE Periodical ' Sequential Variable Bilevel Driving Approach Suitable for Use in High-Color-Precision LED Display Panels ' A bilevel driving approach was proposed in the literature for mitigating the energy wastage associated with driving LEDs at high peak current. The main idea is to introduce two drive parameters, i.e., high/low PWM current levels and duty cycles, that give rise to a 2-D luminosity control capability. The same idea was later generalized to an n-level driving approach for maximizing the electrical-to-light conversion efficiency of LEDs. Although previous uses of the n-level driving approach have been focusing on improving the luminous efficacy of LEDs, it is shown in this paper that its 2-D luminosity control feature can also lead to a significant improvement in color resolution when applied to driving RGB LEDs, hence making it well suited for applications in large-area LED display panels. In comparison to the first prototype driver proposed by the inventor of the driving approach, a more practical implementation of the complex 2-D driving approach with digital microcontroller is demonstrated. The various technical aspects of the driving approach, including luminous efficacy, color resolution, and color stability over dimming, are discussed in this paper with the aid of experimental results.
Sequential Variable Bilevel Driving Approach
High-color-precision Led Display Panel
Energy Wastage Mitigation
2d Luminosity Control Capability
Electrical-to-light Conversion Efficiency
Complex 2d N-level Driving Approach
Light Emitting Diodes
Pulse Width Modulation
Image Color Analysis
Light-emitting Diode (led) Driver
Light-emitting Diode (led)
Communication, Networking And Broadcast Technologies
Signal Processing And Analysis
Power, Energy And Industry Applications
High-low Pwm Current Level