Display device for displaying both video and graphic or character images
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsNobuo Fukushima, Noriyuki Tomimatsu
Life of this patent
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Abstract
A display device in which display elements 21 are arranged in matrix form to provide a screen, and pictures, characters and animations can be displayed while being edited as desired. The display device comprises: a video data memory 8; a graphic data memory 9; a blanking data memory 10 for blocking the output of the video data memory for every display element; and a video mode memory (11), a graphic mode memory (12) and a blanking mode memory (13) which block the outputs of the video data memory (8), the graphic data memory (9) and the blanking data memory (10), respectively, for each of a plurality of areas which collectively form the entire area of the display screen.
Claims15
A display device for displaying pictures and graphs on a display board in which a number of display elements are arranged in matrix form, CHARACTERIZED in that said device comprises:
- a synchronizing separator circuit for separating a composite video signal including synchronizing signals into said synchronizing signals and a video signal of a brightness signal and/or color signals;
- an analog-to-digital (A/D) converter for converting said video signal into a digital signal;
- a video data memory for storing said video digital signal provided by said A/D converter, in accordance with said synchronizing signals;
- a blanking data memory for storing data blocking an output of said video data memory for every display unit;
- a graphic data memory for storing characters and graphs;
- a video mode memory, a graphic mode memory and a blanking mode memory for respectively storing data blocking outputs of said video data memory, blanking data memory and graphic data memory for each of a plurality of areas which form the entire area of said display board;
- a memory controller for controlling the read and write operations of said video data memory, blanking data memory, graphic data memory, video mode memory, graphic mode memory and blanking mode memory;
- a comparator in which a reference brightness signal in response to a pulse width modulation signal reading timing according to data in each memory is compared with the brightness of a data signal delivered out of each memory and said data signal is modulated into a pulse width modulation signal;
- and a drive circuit for receiving said pulse width modulation signal, to drive a flip-flop provided for every display unit, so that pictures, characters and graphs are displayed as desired on said display screen.
A display device for receiving a composite video signal including synchronizing signals and a video signal portion representing a first image and for displaying at least one of said first image and a second image on a display screen formed by a matrix of display elements, said display device comprising:
- signal processing means for receiving said composite video signal and generating video data corresponding to said first image represented by said video signal portion;
- a first memory for storing said video data;
- a second memory for storing further data corresponding to said second image;
- reading means for reading said video and further data out of said first and second memories as first and second memory outputs, respectively;
- combining means for combining said first and second memory outputs into a combined display signal;
- and
- illuminating means for illuminating said display elements in accordance with said combined display signal.
Dependencies are inferred from the claim text.