Patent ID: 8531350

Claim:
A display control apparatus comprising: a storage unit configured to store image data and on-screen display data; a display control unit connected with at least one of a first display device and a second display device, and configured to read the image data and on-screen display data stored in the storage unit based on a supplied clock signal, and output the image data to the first display device or the second display device and a read timing signal, superimpose the on-screen display data on the image data, wherein the first display device displays image data having a first aspect ratio based on the predetermined frequency of horizontal synchronization, and the second display device displays image data having a second aspect ratio that is larger than the first aspect ratio in a horizontal direction based on the predetermined frequency of horizontal synchronization; and a setting unit configured to reserve a memory space having a first horizontal pixel number, in the storage unit and set a frequency of a clock signal supplied to the display control unit to a first frequency when the first display device displays image data, and to reserve a memory space of the second horizontal pixel number that is higher than the first horizontal pixel number and set a frequency of a clock signal supplied to the display control unit to a second frequency that is higher than the first frequency when the second display device displays image data, wherein the display control unit generates the read timing signal which synchronizes with the first frequency clock signal and becomes predetermined level only in a display active period of the first display device when the image data and the on-screen display data are read, and generates the read timing signal which synchronizes with the second frequency clock signal and becomes predetermined level only in a display active period of the second display device when the image data and the on-screen display data are read.