| 摘要 |
PURPOSE:To make uniform the luminous amount to the same gradation by providing a luminous amount correcting memory reading a data having an identical address in synchronizing with a display memory and an accumulator adding and subtracting a data read from both the memories. CONSTITUTION:A gradation data corresponding to one screen of a display device 40 is stored positively in the display memory 17. In supplying a constant power to a light emitting element 41, the deviation with an average luminous amount of the light emitting elements is stored in a luminous amount correcting memory 51 while being converted into a gradation data positively or negatively. Further, the accumulator 52 which adds and subtracts the data read from the luminous amount correcting memory reading a data having an identical address in synchronizing with the display memory 17 and read from the display memory 17 itself and applies the result to a display control circuit 20, is provided. Moreover, the data being too dark or bright to the same power are controlled so as to make uniform the luminous amount to a prescribed gradation data. |
