Patent ID: 8416254

Claim:
A method for providing enhanced visibility in a mobile terminal, the method comprising: (a) automatically without user intervention measuring by a sensing unit an external brightness ambient to a mobile terminal and generating by the sensing unit a visibility adjustment event when a measured ambient brightness value is equal to or greater than a predetermined specific external brightness value; (b) receiving a Red, Green, Blue (RGB) signal of an image currently displayed on a display screen of the mobile terminal according to the generated visibility adjustment event; (c) converting the received RGB signal into first tristimulus values; (d) converting the first tristimulus values into first lightness (L), red-greenness “a”, yellow-blueness “b” color space values; (e) converting the first L, a, b color space values into lightness (L), chroma (C), and hue (H) values using a predetermined equation; (f) adjusting brightness of an entire region of the image which is output on the display screen of the mobile terminal without a user comparison or user selection regarding an extent to which the brightness is adjusted, and adjusting chroma of each pixel region by using the L, C, and H values from step (e); (g) converting L, C, and H values of each pixel region, the lightness and chroma of which have been adjusted in step (f), into second L, a, b color space values, and converting the second L, a, b color space value into second tristimulus values; and (h) generating an RGB signal using the second tristimulus values; Wherein the step of adjusting brightness in step (f) comprises: When a region, a brightness value of which has been adjusted, corresponds to a chromatic region, comparing a predetermined brightness value corresponding to a color of each pixel region included in the chromatic region and the adjusted brightness value of the each pixel region, adjusting the adjusted brightness value downward when the predetermined brightness value is greater than the adjusted brightness value, and maintaining the adjusted brightness value when the predetermined brightness value is equal to or less than the adjusted brightness value.