Patent ID: 8248359
Filing Date: 2012-08-21
Classification: G02F

Abstract:
1. A display apparatus, comprising: a display section formed from a liquid crystal display apparatus of a transmission type having a display area formed from pixels arranged in a matrix; a backlight formed from a plurality of light source units disposed individually corresponding to a plurality of display area units which form the display area and configured to illuminate a back side of said display section; a drive section configured to drive said display section and said backlight based on input signals received by the drive section, the input signals including image signals; an arithmetic operation section for generating a pulse width modulation signal; and a control section, included in the drive section, configured to: control a light emitting state of one of the light source units corresponding to one of the display area units based on the pulse width modulation signal, the pulse width modulation signal controlling pulse width modulation of the one of the light source units and being derived from an internal maximum input signal representing a maximum value from among the image signals; determine whether a high luminance light emitting display area unit exists; determine whether a low luminance light emitting display area unit exists, the low luminance light emitting display area including the one display area unit and a value of the internal maximum input signal being lower than a first prescribed value based on one of the input signals; and determine a value of a ratio between the low luminance light emitting display area unit and the display area in the display section; wherein the high luminance light emitting display area unit includes an additional display area unit and a value of an additional internal maximum input signal being equal to or higher than a second prescribed value which is higher than the first prescribed value and is based on the additional internal maximum input signal, and wherein a luminance of the one light source unit is increased when the control section determines that: (1) the value of the ratio is greater than a predetermined value set based on a characteristic of the one light source unit; (2) the high luminance light emitting display area unit exists; and (3) the low luminance light emitting display area unit exists.