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display device

A display device and transparent electrode technology, which is applied to organic semiconductor devices, electric solid state devices, semiconductor devices, etc., can solve the problems of less than half of the light extraction efficiency and the inability to obtain high luminous efficiency.

Active Publication Date: 2019-09-24
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In principle, in order to make the reflection of external light approximately zero, it is sufficient to install a circular polarizer on the output side. However, the light extraction efficiency is less than half, and high luminous efficiency cannot be obtained.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] The first embodiment will be described. figure 1 It is an overall plan view of the display device DD. figure 2 It is an overall cross-sectional view corresponding to the YY' cross-section of the display device DD. image 3 is an overall circuit diagram of the display device DD. Figure 4 is a pixel circuit diagram of the display device DD. Figure 5 It is a plan view of a plurality of pixels PIX of the display device. Figure 6 is a schematic cross-sectional view of a pixel PIX of the display device. Figure 7 is a cross-sectional view of an organic EL layer OLED. Figure 8 It is a diagram showing the relationship between the inside and outside of the display panel PNL and external light. Figure 9 This is a comparative example showing the movement of luminescence EL from the luminescence point LEP of the organic EL layer OLED. Figure 10 It is a diagram showing the movement of luminescence EL from the luminescence point LEP of the organic EL layer OLED. Figure...

Embodiment approach 2

[0064] In the following embodiments, differences from the above-described embodiments will be described. The same reference numerals as those in the above-mentioned embodiment are assigned to the same constituent elements. Figure 12 is a schematic cross-sectional view of a pixel PIX of the display device. There is no color filter layer CF-FL, but a color filter is provided for each pixel PIX between the sealing film SF and the filling layer FIL, and a red filter CF-R1 is provided for the pixel PIX for red display, The pixel PIX for displaying green is provided with a green filter CF-G1, and the pixel PIX for displaying blue is provided with a blue filter CF-B1. Black matrices BM1 are respectively arranged between the borders of the color filters and the filling layer FIL. By disposing the color filter and the black matrix BM1 near the light-emitting element LEE in this way, it is possible to reliably prevent optical color mixing (the light of the adjacent light-emitting lay...

Embodiment approach 3

[0067] Figure 13 is a schematic cross-sectional view of a pixel PIX of the display device. The insulating bank becomes the insulating bank BANK1, the reflective metal piece RM inside the insulating bank BANK1, and the insulating bank BANK2 inside the reflective metal piece RM. Ends of the black matrix BM are aligned with the flat portion (top) of the insulating bank BANK2 and the boundary portion of the slope. By designing in this way, not only the portion of the light-emitting EL at the light-emitting point LEP that is reflected at the boundary between the insulating bank BANK1 and the organic EL layer OLED and extracted to the outside can be effectively utilized, but also the portion of the light-emitting EL at the light-emitting point LEP that is reflected in the reflective metal can be effectively used. The part RM and the boundary of the insulating bank BANK1 is reflected and taken out to the outside. By using the reflective metal material RM, the light emission EL can...

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Abstract

The display device of the present invention has both high luminous efficiency and low external light reflectance. The display device includes: a colored layer formed on a first substrate; a transparent insulating layer having a first refractive index formed on the colored layer; and a second refractive index greater than the first refractive index formed on the transparent insulating layer. a first transparent electrode; an organic layer having a light emitting layer formed on the first transparent electrode; and a second transparent electrode formed on the organic layer. Light from the outside is absorbed by the colored layer, and light from the organic layer that forms an angle with the normal to the first substrate equal to or larger than a predetermined angle is reflected by the transparent insulating layer and the first transparent electrode and extracted to the outside.

Description

technical field [0001] The present invention relates to a display device, and more particularly to a display device using an organic EL (organic electroluminescent) element. Background technique [0002] In a display device using an organic EL element, it is necessary to achieve both high luminous efficiency and low external light reflectance. In principle, it is sufficient to install a circular polarizing plate on the output side in order to make the reflection of external light approximately zero, but the light extraction efficiency is less than half, and high luminous efficiency cannot be obtained. This is because more than half of the light emitted from the organic EL element is also absorbed by the circular polarizing plate. [0003] Japanese Unexamined Patent Publication No. 2003-17264 (Patent Document 1) discloses a display device in which a plurality of linear first electrodes, an organic layer including a light-emitting layer above the first electrodes, and the org...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52
CPCH10K50/11H10K2102/301H10K59/8792H10K59/879H10K59/878H10K59/873H10K59/8722H10K59/80524H10K59/38H10K59/122H10K59/124H10K59/1315H10K59/126H10K50/865H10K50/81H10K50/86H10K50/828H10K50/844H10K50/856H10K50/8426H10K59/123H10K59/131H10K59/1213H10K2102/00
Inventor 阪本树秋元肇
Owner JAPAN DISPLAY INC