JPS6434073A - Image display device - Google Patents

Abstract

PURPOSE:To cause joints of respective blocks to be unnoticeable, at the time of D/A-converting data accumulated in a memory and outputting them to an electron gun, by executing a prescribed operation to the data with an arithmetic circuit and softening the border of a luminance difference between the adjoining blocks. CONSTITUTION:An arithmetic circuit 3 executes the prescribed operation to read data by a timing signal from a position detector 8 and outputs them to a D/A converter 4. Here, the arithmetic circuit 3 makes the data of a farthest edge in respective blocks of an image screen 6 into 1/2. An electron beam from a number (k) electron gun allocated to the number (k) block of the image screen 6 is scanned in right and left directions by one picture element more than the number of the picture elements of one blocks of the image screen to be originally scanned, the electron beam is overlapped and the same picture element on an image screen 7 is made to be emitted. Consequently, the emission on the image screen 7 by an electron beam 10 from the two electron guns is added and emitted. Thus, the joints between the blocks can be made unnoticeable.