Patent ID: 9625645
Date: 2017-04-18
CPC Classifications: G02B

Claim:
1. A large area light source comprising: a light guide plate; a plurality of light emitting diode (LED) bars divided in a longitudinal direction thereof, each of the LED bars including a circuit board, the plurality of LED bars being arranged along an incident light edge of the light guide plate; a heat dissipation base accommodating the LED bars in series, and a connecting pin for electrically connecting the adjacent ends of the circuit boards to each other, the connecting pin being arranged to bridge a narrow space between the adjacent ends of the circuit boards of the LED bars to couple the LED bars to each other, the connecting pin being formed longer than the narrow space and bent into an inverted U shape extending upward toward the incident light edge of the light guide plate between the ends of the circuit boards, wherein the plurality of LED bars are coupled to each other in a manner to absorb expansion and contraction stress within adjacent ends of the circuit boards, the expansion and contraction stress working between the adjacent ends of the circuit boards in a serial direction thereof, and being induced by deformation of distortion, bending, or strain of the light guide plate, and the LED bars are arranged movable in the heat dissipation base in the serial direction so as to reduce absorption amount of the expansion and contraction stress between the ends of the circuit boards of the LED bars.