Patent ID: 8916258

Claim:
A display apparatus, comprising: a mask layer G comprising portions having a first light transmission characteristic and portions having a second light transmission characteristic for shading; and a pattern layer B, wherein said mask layer is superimposed over said pattern layer comprising portions of a first light emission characteristic and portions of a second light emission characteristic, the portions of the first light emission characteristic and the portions of the second light emission characteristic defining pixels for a plurality of images encoded on the pattern layer, the pattern layer combining a first set of pixels P 1 for a first image and a second set of pixels P 2 for a second image, wherein the mask layer can be moved relative to said pattern layer between a first position, whereby certain portions on said pattern layer are selectively obscured, and a second position whereby other portions on said pattern layer are selectively obscured, wherein said mask layer is moved relative to said pattern layer by a movement of an actuating member coupled thereto as a function of ambient physical conditions; wherein a pixel at a position i, j of the pattern layer B is determined according to the formula: B ( i,j )= P 1( i,j )* G ( i,j )+ P 2( i,j )*(1 −G ( i,j )), wherein G(i,j) is a value of pixel at position i,j in the mask layer G.