公开(公告)号：US20030112378A1

公开(公告)日：2003-06-19

申请号：US10316001

申请日：2002-12-11

Applicant: NEC VIEWTECHNOLOGY, Ltd.

Inventor： Junichi Okunuki ,  Atsushi Kuroda

IPC: H04N005/14 ,  H04N005/74

CPC classification number: H04N9/3182 ,  G09G3/3406 ,  G09G2320/0247 ,  G09G2320/0276 ,  G09G2320/0606 ,  G09G2320/0626 ,  G09G2320/066 ,  G09G2360/16 ,  H04N5/63 ,  H04N5/7416

Abstract: A light quantity control by a user can be synchronized to an automatic light quantity control depending on a luminance level of an input video signal. An image display apparatus partially passes or reflects a light from a light source which can control light quantity and displays an image based on a video signal externally input, and has a predetermined scope of an output level corresponding to a scope of control of light quantity of the light source, and includes: a light quantity control unit having a predetermined scope of an output level corresponding to the scope of control of the light quantity of the light source, and for outputting a reference signal at a level arbitrarily set by a user; an APL detection circuit for detecting the average luminance level for one frame (or one field) of the video signal, and outputting an amplification coefficient depending on the detected average luminance level; a multiplier circuit for multiplying the amplification coefficient by a reference signal, and outputting a control signal which is the multiplication result; and a power circuit for controlling the light quantity of the light source according to the control signal.

Abstract translation: 用户的光量控制可以根据输入视频信号的亮度级别同步到自动光量控制。 图像显示装置部分地通过或反射来自可以控制光量的光源的光，并且基于外部输入的视频信号显示图像，并且具有与光量的控制范围相对应的预定范围的输出电平 并且包括：光量控制单元，具有与光源的光量的控制范围对应的输出电平的预定范围，并且用于输出由用户任意设置的电平的参考信号; APL检测电路，用于检测视频信号的一帧（或一场）的平均亮度级，并输出取决于所检测的平均亮度级的放大系数; 乘法电路，用于将放大系数乘以参考信号，并输出作为乘法结果的控制信号; 以及根据控制信号控制光源的光量的电源电路。