Display device and manufacturing method thereof

By controlling the distance between the reflective layer and the first electrode, and ensuring the insulating layer slope angle variation is within ±10%, the display device achieves consistent light-emitting characteristics across pixels, addressing the inconsistency in existing technologies.

JP2025139868APending Publication Date: 2025-09-29CANON KK
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Patent Information

Application Number
JP2024038938
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-13
Publication Date
2025-09-29

AI Technical Summary

Technical Problem

The existing interference structure in display devices using organic electroluminescence elements (EL elements) results in varying light-emitting characteristics between pixels due to differences in insulating layer thickness and angle, leading to inconsistent performance across color pixels.

Method used

The display device is designed with controlled differences in the distance between the reflective layer and the first electrode, and the angle of the insulating layer slope is maintained within ±10% across pixels, ensuring consistent light-emitting characteristics by using a method that includes forming a first insulating layer with controlled thickness and angle variations.

Benefits of technology

This approach suppresses variations in light-emitting characteristics between pixels, resulting in a more uniform display performance by maintaining consistent film thickness and angle across the insulating layer slopes.

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Abstract

To suppress variations in light-emitting characteristics between pixels of each color in a display device having an interference structure.SOLUTION: In a display device in which the thickness of a first insulating layer 16 disposed between a reflective layer 14 and a first electrode 17 differs between pixels of different luminescent colors, a photoresist with a gradient in film thickness is formed using an area gradation mask, and the insulating film is etched to form the first insulating layer 16, such that the angle A that the slope of the first insulating layer 16 makes with the first surface of the substrate 10 on the end of the reflective layer 14 is within ±10% between pixels of each color.SELECTED DRAWING: Figure 1
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