The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2003
Filed:
Jul. 20, 1998
Osamu Yokoyama, Suwa, JP;
Satoru Miyashita, Suwa, JP;
Hiroshi Kamakura, Suwa, JP;
Tatsuya Shimoda, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A projection display apparatus employing organic EL elements is presented that is light in weight, is small in size, and can be practically implemented. In particular, the apparatus suppresses light-emission performance degradation caused by generated heat, thereby extending useful life, stabilizing brightness, and securing continual maximum brightness. The apparatus comprises; liquid crystal panels R, G, and B; light emitting units R, G, and B, positioned at the back of the liquid crystal panels and provided with organic EL elements as light emitting layers; and cooling bodies R, G, and B, positioned at the back of the light emitting units, for dispersing the heat generated by the light emitting layers. The cooling bodies R, G, and B may, for example, be electronic cooling elements that employ the Peltier effect to absorb and radiate the generated heat. Alternatively, the cooling bodies may be configured as heat-dispersing fins that guide and disperse generated heat.