Dithering Techniques for Electronic Paper Display Image Fidelity

The patent segments the grayscale representation into multiple binary layers. Each layer contains binary pixel data representing a specific grayscale threshold level. By combining multiple binary layers with different threshold levels, the system reconstructs grayscale images using only one-bit display mode, achieving both fast updating speed and improved image fidelity.

The patent transforms the single-dimensional grayscale problem into a multi-dimensional solution by using multiple binary layers stacked together. Each layer represents a different dimension of grayscale information at a specific threshold level. This dimensional transformation allows the system to encode grayscale information that can be displayed using one-bit pixels, resolving the contradiction between speed and fidelity.

By segmenting the image representation into multiple binary layers with different threshold levels, the patent distributes the grayscale information across layers rather than concentrating it in single pixels. This segmentation prevents the formation of concentrated graphic artifacts like ghosting that occur in traditional one-bit display, while maintaining fast updating speed.

Each binary layer in the patent has a specific local quality characterized by its threshold level. Lower layers capture darker regions while higher layers capture lighter regions. This local quality differentiation across layers allows accurate representation of different grayscale regions, reducing artifacts caused by uniform thresholding in traditional one-bit display.