Display device and local method of controlling local dimming thereof preliminary class
AssigneeLG Electronics Inc.
InventorHyunku Kang
Life of this patent
Estimating the term…
Abstract
A display device may include a display panel, a backlight unit including a plurality of blocks for providing light to the display panel, each of the plurality of blocks comprising a plurality of light emitting diodes (LEDs), and a controller configured to obtain backlight control information and to activate a duty ratio control function for controlling a duty ratio and current flowing in a block during a cycle of one frame, when a low current condition is satisfied based on the obtained backlight control information.
Claims16
A display device comprising:
- a display panel;
- a backlight unit including a plurality of blocks for providing light to the display panel, each of the plurality of blocks comprising a plurality of light emitting diodes (LEDs);
- and
- a controller configured to:
- obtain backlight control information,
- obtain a Pulse Width Modulation (PWM) dimming duty ratio value from the backlight control information,
- determine that a backlight control value included in the backlight control information is less than a predetermined value,
- increase a voltage applied to a block and reduce a duty ratio during a cycle of one frame, based on the backlight control value being less than the predetermined value,
- wherein the backlight control value comprises the PWM dimming duty ratio value, and
- wherein the controller is further configured to determine that the backlight control value is less than the predetermined value, based on the PWM dimming duty ratio value being less than a predetermined dimming value,
- wherein the controller is further configured to control the block such that current flowing in the block during a half cycle of one frame is different from current flowing in the block during the other half cycle.
A local dimming control method of a display device comprising a display panel and a backlight unit including a plurality of blocks for providing light to the display panel, the local dimming control method comprising:
- obtaining backlight control information;
- obtaining a Pulse Width Modulation (PWM) dimming duty ratio value from the backlight control information;
- determining that a backlight control value included in the backlight control information is less than a predetermined value;
- and
- increasing a voltage applied to a block and reducing a duty ratio during a cycle of one frame, based on the backlight control value being less than the predetermined value,
- wherein the backlight control value comprises the PWM dimming duty ratio value, and
- wherein determining that the backlight control value is less than the predetermined value comprises determining that the backlight control value is less than the predetermined value, based on the PWM dimming duty ratio value being less than a predetermined dimming value,
- wherein increasing the voltage and reducing the duty ratio further comprise controlling the block such that current flowing in the block during a half cycle of one frame is different from current flowing in the block during the other half cycle.
Dependencies are inferred from the claim text.