Title:
PICTURE DISPLAY DEVICE AND PICTURE DISPLAY METHOD
Document Type and Number:
Japanese Patent JP3215388
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enhance a visual contrast feeling by performing the adjustment of contrast and a light source with keeping correlation.
SOLUTION: A feature detecting part 11 detects the MAX, the MIN and the APL of an input video signal. A control data generating part 12 calculates a Gain amplifying the difference between the MAX and the MIN to the width of the dynamic range and an Offset giving a DC level shifting amount with which the input video signal to be amplified by the Gain is kept within the output dynamic range of a DC level adjusting part 13B. A signal amplitude adjusting part 13A amplifies the input video signal according to the Gain on the basis of the APL. A DC level adjusting part 13B level shifts the input video signal posterior to the amplification according to the Offset. A light source control part 16 controls a light source 18 so that a visual luminance level on a screen becomes to be equal to the luminance level of the input signal based on the Offset.
Inventors:
Taro Funamoto
Takahiro Kobayashi
Yoshito Ota
Katsuyuki Arimoto
Takahiro Kobayashi
Yoshito Ota
Katsuyuki Arimoto
Application Number:
JP20994799A
Publication Date:
October 02, 2001
Filing Date:
July 23, 1999
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G09G3/36; G02F1/133; G09G3/20; G09G3/34; H04N5/66; (IPC1-7): G09G3/36; G02F1/133; G09G3/20; G09G3/34; H04N5/66
Domestic Patent References:
| JP6219835A | ||||
| JP5127608A | ||||
| JP6102484A | ||||
| JP11109317A |
Attorney, Agent or Firm:
Shiro Ogasawara