Patent ID: 9679541
Date: 2017-06-13
CPC Classifications: G06T,G09G

Claim:
1. A display system arranged to display an image on a screen having useful screen areas intended to be seen by a user and non-useful screen areas not visible by the user, comprising: a data memory to store pixels values of the image to be displayed; a data processing unit to control the display of pixels on the screen; and a memory access controller coupled to the data processing unit, the memory access controller to determine whether a pixel to be processed by the data processing unit to be displayed on the screen belongs to a useful screen area or to a non-useful screen area of the screen, and if the pixel belongs to a non-useful screen area, to inhibit a pixel value associated with said pixel from being fetched from the data memory to the data processing unit and to force said pixel with a fixed value to be processed by the data processing unit; wherein the memory access controller further to implement a memory table storing at least one binary data associated with a pixel of the image which defines whether said pixels belongs to a useful screen area of the screen or to a non-useful screen area of the screen; and wherein the memory access controller comprises: at least one counter whose output value defines a position on the screen of a current pixel to be displayed; at least one comparator arranged to compare the position of said current pixel with the useful screen areas defined in the table; and, a control unit arranged to inhibit the fetching of the pixel value associated with the current pixel from the data memory to the data processing unit and to force said current pixel with the fixed value.