Matrix type display device and display method thereof

A matrix type display device comprising:

• a frame memory capable of storing at least one frame of graphic data inputted from an image writing unit;
• a data write control circuit for outputting a write wait signal for causing the write of graphic data to said frame memory to wait, to said image writing unit, and for outputting a write end signal at the time of ending the write of the graphic data inputted from said image writing unit for each frame, in said frame memory;
• a synchronizing circuit for outputting a read start signal on the basis of said write end signal and a frame synchronizing signal;
• a data read control circuit for reading the graphic data stored in said frame memory, on the basis of said read start signal;
• an in-module frame memory for storing the graphic data read from said frame memory;
• and
• a display drive circuit for outputting said frame synchronizing signal, reading the graphic data stored in said in-module frame memory and for driving a display panel for displaying said graphic data;
• and
• wherein said data write control circuit decides it on the basis of the state of the output control signal inputted from said image writing unit whether or not said write wait signal is to be outputted.

A matrix type display device comprising:

• a frame memory capable of storing at least one frame of graphic data inputted from an image writing unit;
• a data write control circuit for outputting a write end signal at the time of ending the write of the graphic data inputted from said image writing unit for each frame, in said frame memory;
• a synchronizing circuit for outputting a read start signal on the basis of said write end signal and a frame synchronizing signal;
• a data read control circuit for reading the graphic data stored in said frame memory, on the basis of said read start signal;
• an in-module frame memory for storing the graphic data read from said frame memory;
• and
• a display drive circuit for outputting said frame synchronizing signal, reading the graphic data stored in said in-module frame memory and driving a display panel for displaying said graphic data;
• and
• wherein said data write control circuit outputs the write wait signal for causing the write of the graphic data in said frame memory, and for detecting the frequency of writing the graphic data in said frame memory from said image writing unit with reference to said frame synchronizing signal thereby to output the write wait OFF flag obtained from said detection result, to said image writing unit;
• and said graphic data write unit controls the output of the graphic data on the basis of said write wait signal and said write wait OFF flag.

A display method for a matrix type display device, comprising:

• a first storing step enabling storing of at least one frame of graphic data inputted from an image writing unit;
• a data write controlling step of outputting a write wait signal for causing the write of the graphic data at said first step to wait, to said image writing unit, and for outputting a write end signal at the time of ending the write of the graphic data inputted from said image writing unit for each frame, in said frame memory;
• a read starting step of outputting a read start signal on the basis of said write end signal and a frame synchronizing signal;
• a data reading step of reading the graphic data stored at said first storing step, on the basis of said read start signal;
• a second storing step of storing the graphic data read at said data reading step;
• and
• a display driving step of outputting said frame synchronizing signal, reading the graphic data stored at said second storing step, and driving a display panel for displaying said graphic data;
• and
• wherein said data write controlling step decides it on the basis of the state of the output control signal inputted from said image writing unit whether or not said write wait signal is to be outputted.