Engineers from Microsemi Corp. said yesterday they have developed an LED-based technique that enables them to enhance color picture quality in large LCD television displays ranging from standard to high-definition (HD) and beyond.
Speaking at the 2008 Consumer Electronics Show here in Las Vegas, Microsemi Engineer Madhu Rayabhari said the new technique uses a driver IC (integrated circuit) and a closed loop control system to enhance the brightness and color of backlighting on TV displays. The technology, he said, offers an improvement over conventional liquid crystal displays (LCDs).
“The problem with LCDs is they don’t give you a full contrast ratio because they leak light,” Rayabhari said. “Using this new method, the range of colors is much superior. The blacks are blacker and the colors are richer.”
Known as DAZL! (Digital Advanced Zone Lighting), the new technology divides the screen into multiple zones, each with red, green and blue light-emitting diodes (LEDs). Using the power management ICs, the system then adjusts electrical current and pulsewidth modulation (PWM) for the desired color and intensity. As a result, it controls the brightness and color of the backlighting to enhance the image being shown.
Microsemi said yesterday the new technology was enabled by industry developments in LEDs, which have offered greater brightness with each passing year. A growing consumer demand for enhanced display technology drove the company’s engineers to meet challenges in power management, color management and thermal management, and thus bring the product to market.
Microsemi is working with all five of the top television manufacturers in the world to enhance picture quality, the company said.
“The real impact of the backlit LEDs will be seen by Christmas 2008,” Rayabhari said.