Display device
AssigneeKoninklijke Philips Electronics N.V.
InventorsHugo Johan Cornelissen, Marinus Josephus Jakobus Dona, Horst Greiner
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Abstract
In an illumination (or front light) system based on an optical waveguide for e.g. LCD devices, Moiré artefacts due to internal reflections in the optical waveguide are minimized by using microstructures (grooves) which have a curved shape or are pre-arranged at an angle.
Claims11
A display device comprising an image display panel having a first substrate which is provided with electrodes at the area of pixels, and an illumination system comprising an optical waveguide of an optically transparent material having an exit face facing the image display panel and a plurality of end faces, at least one of said end faces being an entrance face for light, while light can be coupled into said end face of the optical waveguide, characterized in that the optical waveguide has reflection patterns in the light path, which reflection patterns extend at least partly at an angle to the end face.
An illumination system comprising an optical waveguide of an optically transparent material, having an exit face and a plurality of end faces, at least one of said end faces being an entrance face for light, while light can be coupled into said end face of the optical waveguide, characterized in that the optical waveguide has reflection patterns extending at an angle with respect to the end face.
Dependencies are inferred from the claim text.