Patent ID: 8289467

Claim:
A liquid crystal display device, comprising: a liquid crystal display panel including a first substrate, a second substrate, and liquid crystal held between the first substrate and the second substrate; a backlight; a flexible printed wiring board connected to a part of the first substrate, the flexible printed wiring board including an interface part; a light-emitting diode substrate which has a plurality of light-emitting diodes mounted thereon; a connection substrate for connecting the light-emitting diode substrate and the flexible printed wiring board to each other; a plurality of first lines for supplying a first power supply voltage to each of the plurality of light-emitting diodes, the plurality of first lines being equal in number to the plurality of light-emitting diodes; and a plurality of second lines for supplying a second power supply voltage to each of the plurality of light-emitting diodes, the plurality of second lines being equal in number to the plurality of light-emitting diodes, wherein: the plurality of first lines and the plurality of second lines are formed on the flexible printed wiring board, on the light-emitting diode substrate, and on the connection substrate; the plurality of first lines and the plurality of second lines are arranged, on the light-emitting diode substrate, so that each of the plurality of first lines and each of the plurality of second lines are formed in a pair without intersecting with one another, for each of the plurality of light-emitting diodes; the plurality of first lines and the plurality of second lines are arranged, on the connection substrate, in the same direction as a direction in which the plurality of light-emitting diodes mounted on the light-emitting diode substrate are arranged; and the plurality of first lines formed on the flexible printed wiring board are connected, via a switching line formed on a surface of the flexible printed wiring board, to a common line connected to the interface part, the surface being opposite to a surface on which the plurality of first lines are formed.