LIQUID CRYSTAL DISPLAY DEVICE

• US 20110169803A1
• Filed: 12/17/2010
• Published: 07/14/2011
• Est. Priority Date: 01/13/2010
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yoshizawa, Yoriaki, Kikuchi, Norifumi, Ogawa, Shinji
• Application Number:
  US12/971,973
• Publication Number:
  US 20110169803A1
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

Abstract

A liquid crystal display device includes: a light source section; a liquid crystal display panel including pixels and performing video display; and a drive section. The drive section performs the driving on the light source section for turning ON and OFF in synchronization with the driving of the pixels for the light-sequential writing such that, the liquid crystal display panel is selectively illuminated with the light from a lower emission region in the light source section when the pixels in an upper display region are under the driving for line-sequential writing, and such that, the liquid crystal display panel is selectively illuminated with the light from an upper emission region when the pixels in a lower display region are under the driving for line-sequential writing. A phase difference between emission periods in the upper and lower emission regions falls within a range from 90° to 150° both inclusive.

Claims

1. A liquid crystal display device, comprising:

a light source section;

a liquid crystal display panel configured to include a plurality of pixels and to be in charge of video display by modulating, based on a video signal, a light coming from the light source section; and

a drive section performing driving on the light source section for turning ON and OFF, as well as driving on the pixels in the liquid crystal display panel for line-sequential writing of the video signal,

wherein

the drive section performs the driving on the light source section for turning ON and OFF in synchronization with the driving of the pixels for the light-sequential writing such that,

the liquid crystal display panel is selectively illuminated with the light from a lower emission region of whole emission region in the light source section when the pixels in an upper display region of whole display region in the liquid crystal display panel are under the driving for line-sequential writing, and such that,

the liquid crystal display panel is selectively illuminated with the light from an upper emission region of the whole emission region when the pixels in a lower display region of the whole display region are under the driving for line-sequential writing, and

a phase difference between an emission period in the upper emission region and an emission period in the lower emission region falls within a range from 90°

to 150°

both inclusive.

2. The liquid crystal display device according to claim 1, wherein

in the upper and lower portions of the emission region, a duty ratio of the emission period to a unit drive cycle falls within a range from 0% to 70% upper inclusive.

3. The liquid crystal display device according to claim 1, wherein the light source section is of an edge-light type, including:

a light guide plate configuring the whole emission region;

an upper light source disposed along an edge of the light guide plate on a side of the upper emission region; and

a lower light source disposed along an edge of the light guide plate on a side of the lower emission region.

4. The liquid crystal display device according to claim 1, wherein the light source section is of a direct-light type, including:

an upper light source disposed within the upper emission region; and

a lower light source disposed within the lower emission region.

5. The liquid crystal display device according to claim 1, wherein the light source section is configured with a fluorescent tube or a light-emitting diode (LED).