A 5 X 7 matrix display works on the principle of persistence of vision. A letter displayed on the Dot Matrix display is actually not displayed as a whole. Actually each part is displayed for a fraction of a second and its turned off. The persistence of vision for human eye is 1/24th of a second. Hence the scanning of the matrix is done at a rate equal to or faster than this rate and the viewer gets an apparent illusion that the whole letter is displayed as a whole. The divided segment of the letter H is shown in the figure.
Each of the part is displayed for a fraction of a second and turned off, thus giving the appearance of the letter H. The movement i.e scrolling is made into effect by the use of shift registers.
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