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Details

Inventors: Sakai, Hirofumi;
Assignee: Seiko Epson Corporation (JP)
Primary Examiner: Louie; Wai-Sing
Assistant Examiner:
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.

An emitter has a plurality of types of light-emitting units with different changes in emission characteristics over time. In addition, the emitter includes a deterioration adjustment device which adjusts the deterioration of the emission characteristics over time in a predetermined type of light-emitting unit. The light-emitting units respectively include a light-emitting layer and a hole donor which supplies positive holes to the light-emitting layer, and the deterioration adjustment device may be the hole donor in which the thickness is adjusted based on the deterioration in emission characteristics over time in the predetermined type of light-emitting unit.

DETAILED DESCRIPTION The present invention employs the following constitution to achieve the aforementioned object.
The first aspect of the present invention is an emitter having a plurality of types of light-emitting units with different changes in emission characteristics over time, comprising a deterioration adjustment device which adjusts the deterioration of the emission characteristics over time in a predetermined type of light-emitting unit.
According to this aspect, by adjusting the deterioration of emission characteristics over time in a predetermined type of light-emitting unit to match the deterioration over time in another light-emitting unit, the state of deterioration between the plurality of types of light-emitting units can be made to be the same even if changes in emission characteristics occur over time, thereby making it possible to maintain a constant color balance by the plurality of types of light-emitting units.
In the case of the light-emitting units respectively having a light-emitting layer and a hole donor which supplies positive holes to the light-emitting layer, a constitution can be employed that uses for the deterioration adjustment device a hole donor in which the thickness is adjusted based on the deterioration in emission characteristics over time in the aforementioned predetermined type of light-emitting unit.
In addition, in the case the light-emitting units respectively have a light-emitting layer and an electron donor which supplies electrons to the light-emitting layer, a constitution can be employed that uses for the deterioration adjustment device an electron donor in which the thickness is adjusted based on the deterioration of emission characteristics over time in the aforementioned predetermined type of light-emitting unit.
Moreover, in the case the light-emitting units respectively have a light-emitting layer and a hole donor which supplies positive holes to the light-emitting layer, a constitution can be employed that uses for the deterioration adjustment device at least one of either the aforementioned light-emitting layer and the aforementioned hole donor into which impurities are mixed based on the deterioration of emission characteristics over time in the aforementioned predetermined type of light-emitting unit

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