| 摘要 |
PURPOSE:To change the size of displayed characters without increasing the storage capacity of a memory by compressing stored data of a character font pattern on specific OR logic of plural dots and displaying the characters with the data. CONSTITUTION:A CPU 1, ROM 2, and RAM 3 make a display 6 to display a navigation map, etc., by controlling the display of the display 6, etc. In order to display characters, in addition, the ROM 2 stores data of a character font pattern of 16X16 dots. After the data of the character font pattern of 16X16 dots are read out from the ROM 2 and the data are divided into 4-dot units at every line, the data are subjected to data conversion for compressing the data in the direction of row so that the value obtained by ORing the values of the 2nd and 3rd dots can become the value of the 2nd dot, while the first and last dots are left as they are and the display 6 displays characters by using the converted data. |
