| 摘要 |
[Problem] To address the problem of reliably detecting cable connection errors such as a reverse insertion or an oblique insertion of a cable. [Solution] When an LED board B1 and an LED driver circuit board B2 are connected by an FFC 60, a voltage dividing resistor having resistors 71a, 71b and mounted on the LED board B1 is provided, a connection detection section is connected to one end of the voltage dividing resistor via a first transmission line 73 of the FFC 60, connected to another end of the voltage dividing resistor via a transmission line 75 of the FFC 60, and connected to the dividing point of the voltage dividing resistor via a third transmission line 74 of the FFC 60, wherein at least one of the following compositions are applied: (1) the third transmission line 74 is configured not to pass through a center of the FFC 60, and (2) the resistance values of the resistor 71a and the resistor 71 b are made to be different. Then, a control section 10 is configured to detect the connection state of the FFC 60 based on a voltage of the dividing point, which is detected via the third transmission line 74 by supplying power to a loop circuit composed of the first transmission line 73, the voltage dividing resistor, and the second transmission line 75.
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