Sharp Kabushiki Kaisha Corporation

Masahiro Okui

Toshiyuki Fujine

Takashi Kanda

Michiyuki Sugino

Eishi Oda

Yasushi Tetsuka

Ryuichi Niiyama

Brightness expression without solid white pattern is enabled, and video expression with an improved black level is achieved. A distortion module () reduces the luminance of a backlight source according to the histogram of the video signal so that the contrast may be a predetermined target one. A configuration design unit () sets the gain according to the luminance level (BL) of the backlight source selected by the distortion module (). When setting the gain, the luminance level (BL) for reference of the backlight source preset according to the video feature value is referenced. If the video feature value meets a predetermined condition, the input video signal is always amplified with the gain. If not, depending on the relation between the BLand the BL, the input video signal is amplified or not.

Video display apparatus for adjusting the degree of amplification of the input image according to image characteristics

In general, when a user views an image displayed on a display apparatus, visual environments, such as ambient brightness, a distance from the user to the display apparatus and so on, may disadvantageously cause the image displayed on the display apparatus to become difficult to view. Moreover, it is complicated and troublesome for the user to enter information of ambient light amount and others when setting a picture quality. An image display apparatus holds both question constituent information related to visual environments and choice information serving as answers to questions constituted by the question constituent information, and further holds a plurality of picture quality control rules suitable for visual environments assumed in accordance with the choice information serving as the answers. When sensing a power-up, the image display apparatus outputs the questions; acquires result information that is choices serving as answers from the user to those questions and that is used to acquire the picture quality control rules; and controls the picture quality in accordance with the picture quality control rules acquired in accordance with the result information.

Image display apparatus

Growing community of inventors

Kashiwa, Japan

Masahiro Okui