Printing Device and Method for Electronic Paper

A printing method employing a E-paper printing device, wherein, the E-paper printing device comprises a printhead for applying an electric field to the E-paper, the printhead comprises a first printhead and a second printhead disposed opposed to the first printhead, the E-paper is fed through between the first printhead and the second printhead, and portions of the first printhead and the second printhead contacting with the E-paper respectively are flat surface, a region between the opposed first and second printheads is defined as a printing region, which is divided equally along the paper feeding direction into an erasing region and a writing region, the E-paper is equally divided into N portions along the paper feeding direction, and a length of each portion of the E-paper along the paper feeding direction is equal to a length of the erasing region along the paper feeding direction, the printing method comprises the following steps:

• a same-time erasing and writing step of placing the nth portion of the E-paper in the writing region to have new graphics and texts to be written to the nth portion of the E-paper, and meanwhile, placing the (n+1)th portion in the erasing region to have existing graphics and text in the (n+1)th portion of the E-paper to be erased, wherein 1≦n≦N−1;
• a step-feeding step of feeding the E-paper a step along the paper feeding direction with a step size equal to the length of each portion of the E-paper in the paper feeding direction, such that n=n+1;
• and
• a repeating step of repeating the same-time erasing and writing step and the step-feeding step in the case of determining n≠N,
• wherein an erasing step is performed on the first portion of the E-paper before the same-time erasing and writing step such that the first portion of the E-paper is placed in the erasing region in order to have the existing graphics and texts in the first portion of the E-paper to be erased;
• and
• wherein, in the case of determining n=N in the repeating step, placing the Nth portion of the E-paper in the writing region in order to have new graphics and texts to be written to the Nth portion of the E-paper.

A printing method employing a E-paper printing device, wherein, the E-paper printing device comprises a printhead for applying an electric field to the E-paper, the printhead comprises a first printhead and a second printhead disposed opposed to the first printhead, the E-paper is fed through between the first printhead and the second printhead, and portions of the first printhead and the second printhead contacting with the E-paper respectively are flat surface, and a region between the opposed first and second printheads is defined as a printing region, the printing method comprises the following steps:

• placing the whole E-paper in the printing region;
• erasing existing graphics and texts in the whole E-paper;
• and
• writing new graphics and texts into the whole E-paper.