| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection video display device which can suppress the increase of a temperature gradient within the same board of a light valve whose occurrence is anticipated particularly when used in highland. SOLUTION: An air cooling radiating member 40 which is made of aluminum, for example, and has excellent heat conductivity, is mounted on the upper edge part of the incident side polarizing plate 32a of a liquid crystal light valve 32. Silicone grease is interposed in the contact area between the incident side polarizing plate 32a and a housing recess 40a, thereby thermal resistance is reduced, and heat conduction is well performed. A rugged fin part 40b is formed at the front surface side of the air cooling radiating member 40. By mounting the air cooling radiating member 40 only on the upper limb part of the incident side polarizing plate 32a, heat radiation is promoted at the side of the upper part of the incident side polarizing plate 32a, and the uneven temperature distribution that temperature becomes high at the polarizing plate upper side is relieved.
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