• Journal of Korea Multimedia Society
• /
• v.22 no.8
• /
• pp.860-873
• /
• 2019

LCD backlight boosting and the integration of boosting and dimming are proposed based on image analysis to maximize perceptual image qualities and to reduce display system power. Based on the histogram of the image data, methods for selecting an image suitable for boosting and for adjusting the optimum backlight brightness are proposed. A comprehensive combined optimization method of LCD backlight boosting, dimming and bypass based on image characteristics is also described. Perceptual image quality enhancement and power consumption are evaluated based on well known image databases. Average subjective image quality is improved by 24.8%, RMS contrast is improved more than 20%, and average power consumption is reduced by 15.94% compared to conventional uniform boosting.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.12 no.5
• /
• pp.416-423
• /
• 2007

To drive the CCFL In LCD backlight inverter, a new transformer structure with small volume is proposed which have a boosting voltage and a lamp current balancing functions. The proposed transformer structure has been verified through experimental test with 40inch LCD backlight inverter.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.46 no.7
• /
• pp.39-46
• /
• 2009

A fast-switching current-pulse driver for light emitting diode (LED) backlight is proposed. It uses a regulated drain current mirror (RD-CM) [1] and a high-voltage NMOS transistor (HV-NMOS). It achieves the fast-response current-pulse switching by using a dynamic gain-boosting amplifier (DGB-AMP). The DGB-AMP does not discharge the large HV-NMOS gate capacitance of the RD-CM when the output current switch turns off. Therefore, it does not need to charge the HV-NMOS gate capacitance when the switch turns on. The proposed current-pulse driver achieves the fast current switching by removing the repetitive gate discharging and charging. Simulation results were verified with measurements performed on a fabricated chip using a 5V/40V 0.5um BCD process. It reduces the switching delay to 360ns from 700ns of the conventional current-pulse driver.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.12 no.3
• /
• pp.199-204
• /
• 2007

In this paper, EEFL, which is advantageous for driving multi-lamp and is able to reduce number of inverter, is used and Piezoelectric Transformer, which is able to reduce self loss, miniaturize and has high boosting transfer rate, and parallel connected to drive multi-lamp. For optimized EEFL driver circuit configuration, a Push-Pull type Piezoelectric inverter was designed and a simulation analysis was performed on the inverter circuit, and by applying multiple different type of driving methode, it is proved that a piezoelectric transformer can be used to manufacture a big screen multi-lamp driving inverter.