Light guiding film having light extraction features
AssigneeRohm and Haas Electronic Materials LLC
InventorJunwon Lee
Life of this patent
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Abstract
A light-guiding article has a film substrate that has at least one patterned surface having a plurality of discrete surface features and an incident edge that is substantially orthogonal to the at least one patterned surface. Each surface feature in the plurality of discrete surface features extends along a length direction that is substantially parallel to the incident edge. Taken in cross-section along the length direction, each surface feature has a positively sloped portion, a substantially flat portion, and a negatively sloped portion. A first widthwise cross-section taken at a first position through the positively sloped portion has the same shape as a second widthwise cross-section taken at a second position through the negatively sloped portion.
Claims10
A light-guiding article comprising:
- a film substrate that has at least one patterned surface comprising a plurality of discrete surface features and an incident edge that is substantially orthogonal to the at least one patterned surface,
- wherein each surface feature in the plurality of discrete surface features extends along a length direction that is substantially parallel to the incident edge;
- and wherein, taken in cross-section along the length direction, each surface feature has a positively sloped portion, a substantially flat portion, and a negatively sloped portion and wherein a first widthwise cross-section taken at a first position through the positively sloped portion has the same shape as a second widthwise cross-section taken at a second position through the negatively sloped portion.
A light-guiding article comprising:
- a film substrate that has at least one patterned surface comprising a plurality of discrete surface features and an incident edge that is substantially orthogonal to the at least one patterned surface,
- wherein each surface feature in the plurality of discrete surface features extends along a length direction that is substantially parallel to the incident edge;
- and wherein,
- taken in cross-section along the length direction, each surface feature has a positively sloped portion, a substantially flat portion, and a negatively sloped portion;
- and widthwise cross-sections within the same surface feature, taken orthogonal to the length direction, have the same apex curvature.
A display apparatus comprising:
- a) a spatial light modulator configured to respond to an input image signal for modulating incident illumination;
- b) a light-guiding article comprising:
- a film substrate that has at least one patterned surface comprising a plurality of discrete surface features and an incident edge that is substantially orthogonal to the at least one patterned surface,
- wherein each surface feature in the plurality of discrete surface features extends along a length direction that is substantially parallel to the incident edge;
- and wherein, taken in cross-section along the length direction, each surface feature has a positively sloped portion, a substantially flat portion, and a negatively sloped portion;
- and wherein a first widthwise cross-section taken through the positively sloped portion has the same shape as a second widthwise cross-section taken through the negatively sloped portion;
- and
- c) a light source disposed to direct light into the incident edge of the light-guiding article for redirection as illumination to the spatial light modulator.
Dependencies are inferred from the claim text.