US 9,870,740 B2Granted

Liquid crystal display device and driving method thereof

AssigneeSamsung Display Co., Ltd.

InventorsSe-Ki Park, Yong-Hoon Kwon, Bong-Hyun You, Joon-Chul Goh

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Abstract

A liquid crystal display panel comprises a backlight unit including an optical assembly and configured to differentiate the liquid crystal display panel into a plurality of blocks and to illuminate light to each of the plurality of blocks; a location sensor configured to sense a location of a user watching the liquid crystal display panel; a backlight controller configured to output a dimming value corresponding to a brightness of each of the plurality of blocks according to a result of sensing by the location sensor; and a backlight driver configured to generate a driving current corresponding to the dimming value of each block and to provide the generated driving current to the backlight unit corresponding to each of the plurality of blocks.

Claims17

Dependent claims

A liquid crystal display device, comprising:

a liquid crystal display panel;
a backlight unit, including an optical assembly, to differentiate the liquid crystal display panel into a plurality of blocks and to independently control illumination light of each of the plurality of blocks;
a location sensor to sense a location of a user watching the liquid crystal display panel;
a backlight controller to output a final dimming value corresponding to a brightness of each of the plurality of blocks according to the sensed location of the user, wherein the backlight controller comprises:
a location determiner to determine the user's location including left side or right side information with respect to the display panel by comparing the result of sensing sensed by the location sensor with a reference value;
a left/right side block dimming value control determiner to determine whether or not to control a dimming value of the backlight unit corresponding to a left side or right side block of the liquid crystal display panel according to the user's left or right side, respectively determined by the location determiner;
a rise current calculator to calculate a rise current Iup of the corresponding block according to a result of determination by the left/right side block dimming value control determiner using math formula 1:
Iup=(Imax−Inormal)/90×(90−θ) and math formula 2:
Iup=(Imax−Inormal)/90×(θ−90), a maximum current of each block of the liquid crystal display panel being Imax, an average current of the each block being Inormal, and the user's location being θ;
and
a final dimming value per block generator to generate the final dimming value of each of the plurality of blocks reflecting a value calculated by the rise current calculator;
and
a backlight driver to generate a driving current corresponding to the final dimming value of each block and to provide the generated driving current to the backlight unit corresponding to each of the plurality of blocks, the liquid crystal display panel being interposed between the user and the backlight unit to receive light output from the backlight unit and to produce images therefrom that are viewable by the user.

10 more elements

A method of driving a liquid crystal display device, comprising:

providing a backlight controller that controls a backlight unit that illuminates a liquid crystal display panel within the liquid crystal display device;
differentiating the backlight unit corresponding to the liquid crystal display panel into a plurality of blocks that correspond to light source units used to illuminate the backlight unit;
sensing a location of a user watching the liquid crystal display panel with respect to the liquid crystal display panel;
determining, via a location determiner within the backlight controller, the user's location including left side or right side information with respect to the liquid crystal display panel by comparing a result of the sensing with a reference value;
determining whether or not to control a dimming value of the backlight unit corresponding to a left side or a right side of the liquid crystal display panel according to the user's left side or right side, respectively determined by the location determiner via a left/right side block dimming value control determiner of the backlight controller;
calculating a rise current Iup of the corresponding block according to a result of the determining by the left/right side block dimming value control determiner via a rise current calculator of the backlight controller using math formula 1:
Iup=(Imax−Inormal)/90×(90−θ) and math formula 2:
Iup=(Imax−Inormal)/90×(θ−90), a maximum current of each block of the liquid crystal display panel being Imax, an average current of the each block being Inormal, and the user's location being θ;
generating a final dimming value of each block reflecting the user's location via a final dimming value per block generator of the backlight controller;
outputting the final dimming value of each block corresponding to a brightness of each of the plurality of blocks according to the user's location with respect to the liquid crystal display panel;
generating a backlight driving current corresponding to the final dimming value of each block;
and
generating light according to the backlight driving current and providing the generated light to the liquid crystal display panel.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/734,884Filed 9 Jun 2015
Priority: KR 10-2014-012273216 Sep 2014
Published: US 2016/0078819 A117 Mar 2016
Granted: 16 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G09G 3/342
Control of illumination source: using several illumination sources separately controlled corresponding to different display panel areas, e.g.…
G06F 3/005
Specific input/output arrangements not covered by G06F3/01 - G06F3/16: input arrangements through a video camera
G06F 3/013
Arrangements for interaction with the human body, e.g. for user immersion in virtual reality: eye tracking input arrangements
G09G 3/3648
Control of matrices with row and column drivers: using an active matrix