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Nano Prisms Boost Front-light

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Omron has developed a front-light manufacturing technology designed to create brighter, clearer liquid crystal display (LCD) screens while reducing power consumption. The technique is based on a hybrid integration of a nano prism array (200nm) with a micro prism array (3microns). The key parameters for screen lighting are low power consumption, brightness and contrast. The technique achieves a three-fold improvement in contrast ratio compared with front lights manufactured by other companies, says Omron.
Omron has developed a front-light manufacturing technology designed to create brighter, clearer liquid crystal display (LCD) screens while reducing power consumption. The technique is based on a hybrid integration of a nano prism array (200nm) with a micro prism array (3microns). The key parameters for screen lighting are low power consumption, brightness and contrast. The technique achieves a three-fold improvement in contrast ratio compared with front lights manufactured by other companies, says Omron.


Screen brightness rivals that of notebook computers (100cd/m2) through efficient light control. Conventional front light methods feature low power consumption but low contrast (blurred picture). Back light methods have high contrast (sharp images) but high power consumption.


The company sees application in camera equipped mobile phones and video image transmission equipment.


Omron comparisons indicate that its front light can result in 20mA power consumption, compared with 30mA for other front light solutions and 60mA for typical back light techniques. Contrast ratios of 55:1 are achieved with the Omron product while front lighting gives a low 15:1. Backlight contrast is commonly 50:1. Display brightness is given as 100cd/m2 for both Omron's front light and back light solutions. Front light devices typically give 30cd/m2.


The company says that it uses a proprietary vector radiation coupling technology enabling highly efficient control of emitted light in both back- and front-light solutions. The micro prism array directs the light (back- or front-light) onto the display. In addition to the vector radiation coupling technology, the nanoprism array reduces unwanted internal reflections. The nanoprisms are sized at half the wavelength of blue light (400nm).



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