Display controller and electronic apparatus for changing a brightness of a display in response to a sensed depression of an instruction image on the display

A display controller comprising:

• a control unit including a CPU, a ROM and a RAM;
• an LCD including a liquid crystal panel with a surface to display an image and a backlight operable to illuminate the entire surface of the liquid crystal panel;
• and
• a touch panel laminated above the LCD;
• wherein
• the control unit functions as:
• a display control section operable to display thereon an operation screen on the liquid crystal panel at a predetermined reference brightness by instructing the backlight to illuminate the entire surface of the liquid crystal panel at the predetermined reference brightness, the operation screen having one or more instruction images arranged thereon and each being depressible to input a specific operator instruction;
• a depression detection section operable to detect a depression of each of the instruction images by using the touch panel;
• a brightness adjustment section operable, when a depression of one of the instruction images is detected by the depression detection section, to instruct the display control section to change brightness of the entire operation screen from the reference brightness by a change amount preliminarily associated with the one instruction image;
• a frequency storage section storing therein a frequency with which a depression of each of the instruction images is detected by the depression detection section;
• a frequency updating section operable, when a depression of one of the instruction images is detected by the depression detection section, to update the frequency of the one instruction image stored in the frequency storage section;
• a change amount updating section operable to set a change amount associated with a first one of the instruction images whose frequency stored in the frequency storage section is a first frequency, in such a manner as to become greater than a change amount associated with a second one of the instruction images whose frequency stored in the frequency storage section is a second frequency less than the first frequency;
• and
• the change amount updating section updates the change amount associated with each instruction image in such a manner as to become smaller as the cumulative number-of-times value of the depression detection by the depression detection section becomes smaller.