Patent ID: 6057838
Filing Date: 2000-05-02
Classification: G09G

Abstract:
A window control device for displaying a plurality of window regions superimposed on one another on a display screen, comprising:mask data production means for producing mask data so that whether or not pixel data for displaying a predetermined window region among the plurality of window regions should be displayed on a predetermined pixel of the display screen is determined before the predetermined window region is displayed, and subsequently whether or not pixel data for displaying the predetermined window region should be displayed on at least one pixel which is consecutive to the predetermined pixel is determined, so that the mask data can indicate whether or not the respective pixel data should be displayed on the predetermined pixel and the at least one pixel; andpixel data renewing means for renewing the pixel data for the predetermined pixel based on the mask data, as well as the pixel data for the at least one pixel which is consecutive to the predetermined pixel based on the mask data.