Tamper-evident electric paper
First Claim
1. A method of forming an electric paper document, comprising:
- orienting pixels of a first sheet of electric paper in a first pattern; and
orienting pixels of a second sheet of electric paper in a second pattern different from the first pattern, the second sheet being positioned in relation to the first sheet such that a first electric field that orients the pixels of the first sheet also orients the pixels of the second sheet.
4 Assignments
0 Petitions
Accused Products
Abstract
Tamper-evident electric paper is made of two sheets of electric paper bonded together, the bottom sheet of which includes a pattern. Any attempt to erase a writing on the top sheet of electric paper results in the pattern on the bottom sheet of electric paper being erased. Therefore any tampering by erasure of a writing on the tamper-evident electric paper is revealed by the absence of a portion of the pattern on the bottom sheet of electric paper. Single sheet tamper-evident electric paper has a complex pattern, such as an encryption, printed on a single sheet of electric paper. Any attempt to erase a writing on the electric paper also erases a portion of the encryption, thereby providing evidence of tampering.
-
Citations
6 Claims
-
1. A method of forming an electric paper document, comprising:
-
orienting pixels of a first sheet of electric paper in a first pattern; and
orienting pixels of a second sheet of electric paper in a second pattern different from the first pattern, the second sheet being positioned in relation to the first sheet such that a first electric field that orients the pixels of the first sheet also orients the pixels of the second sheet. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification