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US 2020/0051484 A1Published application
Backlight device and display device provided with same
AssigneeSharp Kabushiki Kaisha
InventorMASAFUMI YASHIKI
Life of this patent
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Abstract
An LED data holding unit that holds turn-on control data for controlling the luminance of each LED included in a backlight device is provided in an LED drive circuit. The LED data holding unit is implemented by, for example, registers. When the LED drive circuit drives the LEDs, the LED drive circuit switches a read destination of the turn-on control data from the LED data holding unit based on a turn-on switching signal. Turn-on control data for each LED is read from the LED data holding unit a ty of times during each frame period.
Claims10
A backlight device including LEDs as light sources, the backlight device comprising:
- a plurality of LED units divided into a plurality of groups, each of the plurality of LED units including one or more LEDs;
- and
- an LED drive circuit configured to time-divisionally drive the LEDs included in the plurality of LED units on a group-by-group basis, wherein
- the LED drive circuit:
- includes a turn-on control data holding unit configured to hold turn-on control data, the turn-on control data being data transmitted from an external source to control luminances of the one or more LEDs included in each of the plurality of LED units;
- and
- drives a drive-target LED based on turn-on control data read from the turn-on control data holding unit based on a predetermined turn-on switching signal,
- the one or more LEDs included in each of the plurality of LED units are driven N times (N is an integer greater than or equal to two) during one frame period, and
- turn-on control data corresponding to the one or more LEDs included in each of the plurality of LED units is read by the LED drive circuit N times during one frame period from the turn-on control data holding unit.
6 more elements
Dependencies are inferred from the claim text.