US 2020/0264476 A1 · BACKLIGHT AND DISPLAY DEVICE PROVIDED WITH SAME

Abstract

A liquid crystal driving frequency detection unit that determines a liquid crystal driving frequency based on a vertical synchronization signal is provided in an LED drive circuit. In addition, a look-up table that holds a correspondence relationship between the liquid crystal driving frequency and the lighting frequency of the LEDs is provided in a control unit in the LED drive circuit. The correspondence relationship is held in the look-up table such that, for example, when the liquid crystal driving frequency becomes one-nth of that before change, the lighting frequency of the LEDs becomes n times of that before change. The LED drive circuit determines the lighting frequency of the LEDs by referring to the look-up table when the liquid crystal driving frequency changes.

Claims8

Dependent claims

A backlight for a display panel, the backlight including a plurality of LEDs as light sources, and the backlight comprising:

a plurality of LED units divided into a plurality of blocks, each of the plurality of LED units including one or more LEDs, and
a turn-on control circuit configured to turn on the plurality of LEDs in a time-sharing manner and on a block-by-block basis, wherein
in regard to a first frequency and a second frequency which are two frequencies satisfying a following expression, when a driving frequency of the display panel changes from the first frequency to the second frequency, the turn-on control circuit increases a lighting frequency of the plurality of LEDs:
the first frequency>the second frequency.

1 more element

Dependencies are inferred from the claim text.

Backlight and display device provided with same

Life of this patent

Backlight and display device provided with same

Life of this patent

Abstract

Claims8