Light emitting diode back light unit
View Patent ↗A light emitting diode backlight (LED) unit includes: a substrate having a plurality of divided areas; a plurality of LEDs disposed on the substrate; and an LED driver supplying a drive power to the plurality of LEDs disposed in at least two of the plurality of divided areas, wherein at least a part of the plurality of LEDs disposed in one of the plurality of divided areas is electrically connected to each other.
1. A light emitting diode backlight unit comprising:
a substrate having a plurality of divided areas, the divided areas of the substrate being separated spatially from one another;
a plurality of light emitting diodes disposed on each divided area; and
a light emitting diode driver electrically connected to the plurality of light emitting diodes disposed in at least two of the plurality of divided areas,
wherein the plurality of light emitting diodes, disposed in the plurality of divided areas, are electrically connected to each other so as to form respective LED connection configurations,
wherein the LED connection configurations, formed on one of the divided areas, is electrically connected in series or parallel with the LED connection configuration formed on another divided area, and
wherein the LED connection configurations, connected to each other, receive drive power from the light emitting diode driver.
2. The light emitting diode backlight unit of claim 1 , further comprising:
a sensor portion detecting an amount of light emitted by the plurality of light emitting diodes; and
a controller comparing the light amount detected by the sensor portion with a previously determined reference light amount and controlling the drive power supplied to the plurality of light emitting diodes according to a result of the comparison.
3. The light emitting diode backlight unit of claim 2 , wherein the light emitting diode driver comprises a pulse width modulation driving portion determining a size of the drive power supplied to the light emitting diodes by switching a power supply on/off and the controller controls the drive power by determining an on/off switching duty ratio of the pulse width modulation driving portion.
4. The light emitting diode backlight unit of claim 1 , wherein the plurality of light emitting diodes comprises:
a plurality of red light emitting diodes emitting red light;
a plurality of green light emitting diodes emitting green light; and
a plurality of blue light emitting diodes emitting blue light,
wherein mutual electrical connection is formed between light emitting diodes whose color of lights are identical with each other.
5. The light emitting diode backlight unit of claim 4 , wherein the light emitting diode driver comprises:
a red light emitting diode drive circuit supplying a drive power to the plurality of red light emitting diodes;
a green light emitting diode drive circuit supplying a drive power to the plurality of green light emitting diodes; and
a blue light emitting diode drive circuit supplying a drive power to the plurality of blue light emitting diodes.
6. The light emitting diode backlight unit of claim 1 , further comprising:
a sensor portion detecting an amount of light emitted by the plurality of light emitting diodes.
7. The light emitting diode backlight unit of claim 6 , further comprising:
a controller comparing the light amount detected by the sensor portion with a previously determined reference light amount and controlling the drive power supplied to the plurality of light emitting diodes according to a result of the comparison.