BACKLIGHT DEVICE, AND DISPLAY DEVICE PROVIDED WITH SAME
First Claim
1. 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;
whereincontrol of supply of a current to each of the LEDs is performed by controlling on/off of a corresponding switch, anda 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.
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Accused Products
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).
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Citations
14 Claims
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1. An edge-light type backlight device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification