Brightness enhancement by fluid interface deformation in TIR-modulated displays
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United States of America Patent
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Jul 20, 2010
Grant Date -
May 27, 2010
app pub date -
Jan 15, 2007
filing date -
Jan 17, 2006
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Abstract
A reflective display having a plurality of transparent hemi-beads (120), each having a reflective region (80) surrounding a non-reflective region (82). Each hemi-bead has an associated light absorptive fluid droplet (122) having a normally relaxed shape contacting the non-reflective region, thereby frustrating total internal reflection of light rays at the droplet/hemi-bead interface. An electrical potential is selectably applied across selected droplets. Application of the electrical potential across a droplet deforms the droplet away from the hemi-bead associated with the droplet, such that light rays (158) incident on the non-reflective region are refracted toward substrate (124) and reflected back through hemi-bead (120) in an approximately opposite direction (166); and such that light rays (162) incident on the reflective region are semi-retro-reflected (168). Removal of the electrical potential allows the droplet to resume the relaxed shape.
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