The AC LED Alliance of Taiwan, under the direction of the Industrial Technology Research Institute (ITRI), is ready to submit the world’s first AC-powered LED technology standard proposal to the International Commission on Illumination.Taiwan has already owned 80 patents on various AC LED innovations and is working closely with U.S. and led high bay light institutes and companies in this field.From upstream to downstream, we are strategically mapping our AC LED-related patents to avoid patent disputes because we don’t own the core technologies,” Ian Chan, vice president and director-general of ITRI’s Electronics and Optoelectronics Research Laboratories, said at a product exhibition in Taipei yesterday. “Out goal is to become the international leader in AC LED technology,” he said.
The AC LED is basically LED lighting that can operate on AC power without the need for a DC converter. It is low cost, compact in size and has no electrostatic discharges, said Epistar Corp executive assistant Wang Shi-wei. The AC LED effectively saves between 15 percent and 30 percent of electricity compared with regular LED. It can replace traditional light bulbs, incandescent tubes and halogen used in households, Wang said.To provide uniformed LED brightness and accurate LED color for high-end LED display panels, “matched LEDs” are insufficient, and dot correction of each LED pixel becomes necessary. However, it is costly and complex to process dot correction through controllers for the increasing loading of the controllers and the limited control of LED pixels. The new digital dot correction designed in MBI5040 not only unifies the LED brightness and avoids the LED color change during the dot correction process, but also reduces the loading and the cost of controllers.
There are two kinds of dot correction methods in the market, analog and digital dot corrections. However, analog dot correction usually results in the LED wavelength shift, which may cause the color change of LED. MBI5040 especially features 8-bit digital dot correction to compensate individual LED brightness at the same visual refresh rate. In addition, a patented circuit is built-in to multiply the grayscale data and dot correction data. Therefore, MBI5040 provides the flexibility to adjust the overall LED brightness with the changes of ambient lighting and ensures the LED brightness uniformity without concerning the inaccurate LED color or sacrificing the gray scales of the video image or the visual refresh rate during the dot correction process. MBI5040 also features 16-bit gray scale with patented S-PWM technology to increase visual refresh rate.
The AC LED is basically LED lighting that can operate on AC power without the need for a DC converter. It is low cost, compact in size and has no electrostatic discharges, said Epistar Corp executive assistant Wang Shi-wei. The AC LED effectively saves between 15 percent and 30 percent of electricity compared with regular LED. It can replace traditional light bulbs, incandescent tubes and halogen used in households, Wang said.To provide uniformed LED brightness and accurate LED color for high-end LED display panels, “matched LEDs” are insufficient, and dot correction of each LED pixel becomes necessary. However, it is costly and complex to process dot correction through controllers for the increasing loading of the controllers and the limited control of LED pixels. The new digital dot correction designed in MBI5040 not only unifies the LED brightness and avoids the LED color change during the dot correction process, but also reduces the loading and the cost of controllers.
There are two kinds of dot correction methods in the market, analog and digital dot corrections. However, analog dot correction usually results in the LED wavelength shift, which may cause the color change of LED. MBI5040 especially features 8-bit digital dot correction to compensate individual LED brightness at the same visual refresh rate. In addition, a patented circuit is built-in to multiply the grayscale data and dot correction data. Therefore, MBI5040 provides the flexibility to adjust the overall LED brightness with the changes of ambient lighting and ensures the LED brightness uniformity without concerning the inaccurate LED color or sacrificing the gray scales of the video image or the visual refresh rate during the dot correction process. MBI5040 also features 16-bit gray scale with patented S-PWM technology to increase visual refresh rate.
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