US 2019/0317271 A1Published application

Backlight device, and display device provided with same

AssigneeSharp Kabushiki Kaisha

InventorNAOTO INOUE

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Abstract

In an edge-light type backlight device having a configuration in which an LED mounting board with four LEDs (1(1) to 1(4)) placed thereon is disposed on one end side of a display unit and an LED mounting board with four LEDs (1(5)-1(8)) placed thereon is disposed on the other end side of the display unit, a cathode terminal of an LED (1(4)) disposed most downstream on the LED mounting board disposed on the one end side of the display unit and an anode terminal of the LED (1(5)) disposed most upstream on the LED mounting board disposed on the other side end of the display unit are connected through wiring on an LED drive board. All of the LEDs (1(1) to 1(8)) are driven by only one DC-DC converter (11).

Claims14

Dependent claims

An edge-light type backlight device, comprising:

a light guide plate;
a first LED group that is a plurality of LEDs connected in series;
a second LED group that is a plurality of LEDs connected in series;
switches each being connected in parallel with a corresponding LED;
a first LED mounting board which is disposed on one end side of the light guide plate and on which the first LED group is placed;
a second LED mounting board disposed on the other end side of the light guide plate and on which the second LED group is placed;
and
an LED drive board on which a circuit for driving the first LED group and the second LED group is formed;
wherein
control of supply of a current to each of the LEDs is performed by controlling on/off of a corresponding switch, and
a cathode terminal of a LED disposed most downstream in the first LED group and an anode terminal of a LED disposed most upstream of the second LED group are electrically connected to each other through wiring on the LED drive board.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/341,203Filed 4 Oct 2017
Priority: JP 2016-2142461 Nov 2016
Published: 17 Oct 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

G02B 6/0083
Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides,…:…
F21S 2/00
Systems of lighting devices, not provided for in main groups f21s4/00 -
F21V 23/00
Arrangement of electric circuit elements in or on lighting devices
G02B 6/0068
Characterised by the light source being coupled to the light guide: arrangements of plural sources, e.g. multi-colour light sources

Family

US 10,514,491 B2Related patent
US 2019/0317271 A1This patent

From the US filing history. Foreign family members aren’t listed.

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