Title:
LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP2019191397
Kind Code:
A
Abstract:
To prevent changes in characteristics of a liquid crystal due to a temperature change without drastically changing brightness of a display screen.SOLUTION: A liquid crystal display device includes: a liquid crystal panel; a plurality of light sources disposed on the back of the liquid crystal panel; a temperature sensor disposed on the back side of the liquid crystal panel and detecting temperature in the device; and a control circuit adjusting a duty ratio of a drive signal by pulse width modulation based on the temperature in the device detected by the temperature sensor so as to control lighting of the plurality of light sources. When the temperature in the device is within a predetermined temperature range, the control circuit updates the duty ratio of the current drive signal so as to gradually decrease the difference between the current duty ratio per unit time and a target duty ratio preliminarily determined with respect to the temperature in the device.SELECTED DRAWING: Figure 7
Inventors:
YODA KAZUHIKO
Application Number:
JP2018084959A
Publication Date:
October 31, 2019
Filing Date:
April 26, 2018
Export Citation:
Assignee:
SHARP KK
International Classes:
G02F1/133; F21S2/00; F21V23/00; G02F1/13357; G09G3/20; G09G3/34; G09G3/36; H05B37/02
Attorney, Agent or Firm:
Kawakami Keiko
Takao Matsuyama
Chiaki Otsuka
Takao Matsuyama
Chiaki Otsuka