The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2008
Filed:
Jul. 20, 2004
Hiroshi Aoki, Chiyoda-ku, Tokyo 100-8220, JP;
Ryo Hasegawa, Chiyoda-ku, Tokyo 100-8220, JP;
Hirofumi Sakamoto, Chiyoda-ku, Tokyo 100-8220, JP;
Haruki Takata, Chiyoda-ku, Tokyo 100-8220, JP;
Yasutaka Tsuru, Chiyoda-ku, Tokyo 100-8220, JP;
Hiroshi Aoki, Chiyoda-ku, Tokyo 100-8220, JP;
Ryo Hasegawa, Chiyoda-ku, Tokyo 100-8220, JP;
Hirofumi Sakamoto, Chiyoda-ku, Tokyo 100-8220, JP;
Haruki Takata, Chiyoda-ku, Tokyo 100-8220, JP;
Yasutaka Tsuru, Chiyoda-ku, Tokyo 100-8220, JP;
Other;
Abstract
An object of the present invention is to provide an image display technology with which high contrast can be stably obtained. In order to achieve the above object, the present invention changes the gain of a digital luminance signal by feeding back information on maximum and average luminance levels of the luminance signal, adjusts image contrast, and in accordance with the average luminance level detected from the feedback system, controls the illuminance of the backlight applied to a display unit. The control increases the illuminance of the backlight when the detected average luminance level is higher than the upper-limit value of a previously set reference range, and reduces the illuminance when the detected average luminance level is lower than the lower-limit value of the reference range.