Projection display device

1. A projection display device, comprising:

a light source device including a plurality of light sources and combining light from the light sources such that the combined light emits from the light source device;

a light modulator for modulating the light having emitted from the light source device;

a main body cabinet having the light source device and the light modulator disposed therein;

a plurality of apertures disposed in the main body cabinet such that the respective light sources are taken in and out therethrough;

a plurality of light source covers for covering the respective apertures;

a plurality of opening and closing detectors disposed correspondingly to the respective light source covers and detecting opening and closing of the respective light source covers; and

a supply part for supplying an electrical signal to the respective opening and closing detectors,

wherein the respective opening and closing detectors are disposed on one circuit board, and

the circuit board includes

an input part to which the electrical signal is input from the supply part; and

a conductive path for branching the electrical signal having input to the input part and for leading the branched signal to each of the opening and closing detectors.

2. The projection display device of claim 1 , wherein

the light source device includes a pair of the light sources facing each other and a light combiner, the light combiner being disposed between one and an other one of the pair of light sources and combining the light having emitted from each of the pair of light sources,

the apertures and the light source covers corresponding to the respective light sources are disposed above the pair of light sources,

the circuit board is disposed above the light combiner,

each of the opening and closing detectors is disposed on the circuit board in proximity to one of the light source covers corresponding to the opening and closing detector, and

at an end of each of the light source covers on a side of the light combiner, an actuator is disposed so as to bring one of the opening and closing detectors corresponding to each light source cover into an operating state or a non-operating state in response to opening and closing of the light source cover.

3. The projection display device of claim 2 , further comprising a combiner cover over the light combiner, wherein the circuit board is attached to the combiner cover.

4. The projection display device of claim 1 , further comprising a plurality of light source drivers disposed correspondingly to the respective light sources and driving the respective light sources,

wherein the electrical signal is input to the respective light source drivers via the respective opening and closing detectors,

when one of the light source covers corresponding to one of the opening and closing detectors is opened, the opening and closing detector interrupts the electrical signal, and

when the electrical signal is interrupted, a corresponding one of the light source drivers stops driving of a corresponding one of the light sources.

5. The projection display device of claim 1 , further comprising a plurality of temperature detectors disposed correspondingly to the respective light sources,

wherein the respective temperature detectors are disposed in series with each other on a signal line from the supply part to the input part and interrupt the electrical signal when a detected temperature exceeds a threshold.

6. A projection display device, comprising:

a light source device including a plurality of light sources and combining light from the light sources such that the combined light emits from the light source device;

a plurality of light source drivers disposed correspondingly to the respective light sources and driving the respective light sources; and

a plurality of temperature detectors disposed in different positions in periphery of the respective light sources,

wherein an electrical signal obtained by branching an electrical signal from a signal supply source is input to the respective light source drivers such that the light source drivers drive the respective light sources,

the respective temperature detectors are disposed in series with each other on a signal line from the supply part to places where the electrical signal is branched, and interrupt the electrical signal from the supply part when a detected temperature exceeds a threshold,

when the electrical signal from the supply part is interrupted and thereby the respective branched electrical signals are not input, the light source drivers stop driving of the respective light sources.

7. The projection display device of claim 2 , further comprising a plurality of light source drivers disposed correspondingly to the respective light sources and driving the respective light sources,

wherein the electrical signal is input to the respective light source drivers via the respective opening and closing detectors,

when one of the light source covers corresponding to one of the opening and closing detectors is opened, the opening and closing detector interrupts the electrical signal, and

when the electrical signal is interrupted, a corresponding one of the light source drivers stops driving of a corresponding one of the light sources.

8. The projection display device of claim 3 , further comprising a plurality of light source drivers disposed correspondingly to the respective light sources and driving the respective light sources,

wherein the electrical signal is input to the respective light source drivers via the respective opening and closing detectors,

when one of the light source covers corresponding to one of the opening and closing detectors is opened, the opening and closing detector interrupts the electrical signal, and

when the electrical signal is interrupted, a corresponding one of the light source drivers stops driving of a corresponding one of the light sources.

9. The projection display device of claim 2 , further comprising a plurality of temperature detectors disposed correspondingly to the respective light sources,

wherein the respective temperature detectors are disposed in series with each other on a signal line from the supply part to the input part and interrupt the electrical signal when a detected temperature exceeds a threshold.

10. The projection display device of claim 3 , further comprising a plurality of temperature detectors disposed correspondingly to the respective light sources,

wherein the respective temperature detectors are disposed in series with each other on a signal line from the supply part to the input part and interrupt the electrical signal when a detected temperature exceeds a threshold.

11. The projection display device of claim 4 , further comprising a plurality of temperature detectors disposed correspondingly to the respective light sources,

wherein the respective temperature detectors are disposed in series with each other on a signal line from the supply part to the input part and interrupt the electrical signal when a detected temperature exceeds a threshold.

12. The projection display device of claim 7 , further comprising a plurality of temperature detectors disposed correspondingly to the respective light sources,

wherein the respective temperature detectors are disposed in series with each other on a signal line from the supply part to the input part and interrupt the electrical signal when a detected temperature exceeds a threshold.

13. The projection display device of claim 8 , further comprising a plurality of temperature detectors disposed correspondingly to the respective light sources,

wherein the respective temperature detectors are disposed in series with each other on a signal line from the supply part to the input part and interrupt the electrical signal when a detected temperature exceeds a threshold.