×

Luminance enhancement structure with varying pitches

  • US 9,025,234 B2
  • Filed: 01/20/2010
  • Issued: 05/05/2015
  • Est. Priority Date: 01/22/2009
  • Status: Active Grant
First Claim
Patent Images

1. A display device assembly comprisingi) a display device comprising display cells filled with a display fluid, and a substrate layer above the display cells, andii) a luminance enhancement structure between a viewing side and the substrate layer, wherein the luminance enhancement structure comprises columns and grooves in an alternating order, anda) each of said columns has a planar top surface having a width;

  • b) each of said grooves has a triangular cross-section and an apex angle, wherein said triangular cross-section has an open side having a width; and

    c) said structure has pitches varying between about 1% to about 25% within the structure, wherein each of the pitches is the sum of the width of the open side of the triangular cross-section of the groove and the width of the planar top surface of a neighboring column and the difference between the widest pitch and the narrowest pitch within the luminance enhancement structure is at least 1 μ

    m, and said substrate layer is in contact with the planar top surfaces of the columns in the luminance enhancement structure;

    wherein an external light from above the luminance enhancement structure strikes a tilted surface of the grooves of the luminance enhancement structure and then the light is reflected by total internal reflection instead of transmitting through the space within the groove.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×