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Light emitting device

A light-emitting device and light-emitting layer technology, which is applied in lighting devices, electroluminescent light sources, light sources, etc., can solve problems such as disconnection, cracks, and uneven brightness of light-emitting elements

Active Publication Date: 2008-08-13
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the insulating layer has a step, the electrode may be disconnected or cracked in the upper layer overlapping with the step.
Since the impedance value of the electrode increases at the site where disconnections and cracks occur, the brightness unevenness of the light-emitting element becomes more pronounced

Method used

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Experimental program
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no. 2 Embodiment approach

[0075] Next, a light emitting device according to a second embodiment of the present invention will be described. FIG. 8 is a partial cross-sectional view of a light emitting device 2A according to the present embodiment. As shown in FIG. 8 , the auxiliary electrode 150 is formed to be in surface contact with the upper surface of the common electrode 72 , and the sealing film 80 is formed to cover the auxiliary electrode 150 and the common electrode 72 . The light emitting device 2A is the same as the light emitting device 1A ( FIG. 7 ) according to the first embodiment except that the common electrode 72 is formed in the lower layer of the auxiliary electrode 150 . Therefore, the description thereof will be appropriately omitted.

[0076] Similar to the light-emitting device 1A described above, in this embodiment, the auxiliary electrode 150 is formed on the upper layer near the partition wall 37 in the portion where the partition wall 37 is provided. Accordingly, like the ...

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PUM

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Abstract

The present invention provides a light emitting device (1), wherein a second interlayer insulating film (35), an auxiliary electrode (150) and a common electrode (72) are sequentially stacked on the element layer (30). The end (E4) of the auxiliary electrode (150) is formed so as to be located outside the end (E1) of the common electrode (72) in the plane of the substrate (10), and the end (E1) of the common electrode (72) It is formed so as to be located on the inner side of the end (E2) of the second interlayer insulating film (35). The auxiliary electrode (150) has a portion overlapping and electrically connected to a second electrode power supply line that supplies a potential to the common electrode (72). Accordingly, the frontal edge region of the light emitting device can be reduced, and variations in luminance of the light emitting element can be suppressed.

Description

technical field [0001] The present invention relates to a light-emitting device using a light-emitting element such as an organic EL (Electroluminescence) element. Background technique [0002] There is known a light-emitting device in which a plurality of light-emitting elements are arranged in an active area on a substrate, and various wirings are arranged in a peripheral area surrounding the active area. Each light-emitting element has a light-emitting layer formed of a light-emitting material such as an organic EL material sandwiched between the first electrode and the second electrode. In most cases, the second electrode is a common electrode provided for multiple light emitting elements, and is provided across the effective area. However, voltage drop occurs within the electrode surface due to the impedance of the electrode itself, and the potential supplied to the light-emitting element may vary depending on the position on the substrate, so the luminance of the ligh...

Claims

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Application Information

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IPC IPC(8): H05B33/26H05B33/22H05B33/14
CPCY02E10/549H10K59/124H10K59/131H10K77/10H10K50/11H10K50/824H10K50/84
Inventor 洼田岳彦
Owner SEIKO EPSON CORP