Method and apparatus for modulating sub-pixel in grayscale display

The present invention is a gray-scale black and white output device to represent the low gradation output device through to the sub-pixel modulation method and apparatus for gray level representation of a black and white output devices, and more particularly, high modulation of the sub-channel pixel of the gray level input image sub-pixel modulation method for the expression and to a device. The sub-channel pixel modulation method for the gradation of black and white output device according to an embodiment of the present invention, M + K (M, K is an integer of 1 or greater), a black-and-white and grayscale input image of the bit a low gray level of the M-bit having the steps of in the pixel modulation method of the sub-channels to represent the black and white output image via a plurality of subchannels, the selection of a mask pattern of a plurality of sub-channel from a plurality of steps, the generated plurality of the mask pattern for generating a mask pattern , it reflects the selected mask pattern value and determining a weight using a K-bit least significant bit data of the input image, and weighted by a step to obtain the M-bit data of the multiple sub-channels. Dithering (Dithering), a mask, a subchannel modulator, black and white (Grayscale) display, a medical display