OLED Pixel-Isolating Insulation Structure for Leakage Control
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Solution Overview
Problem
Conventional OLED panels with pixel-isolating insulation films face issues of deteriorated light emission properties due to coverage loss in organic films, cathode electrode films, and protective films, leading to current leakage and defects such as color gamut deterioration, color registration errors, and luminous efficiency loss.
Innovation Solution
A light-emitting element design featuring a pixel-isolating insulation film with a tapered shape and multiple layers (lower, intermediate, and upper insulating layers) that includes an eave structure to cut organic layers and charge generation layers, preventing leakage by providing a eaves, ensuring the anode electrode, and the CGL is cut by providing a pixel-isolating insulation film with a eave structure to cut organic layers and charge generation layers, thereby isolating pixels and improving light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel-isolating insulation film is disposed to cut the organic material between pixels, then current leakage is suppressed, but the coverage of organic film, cathode electrode film, and protective film deteriorates
Solution Approach 1:
The pixel-isolating insulation film is divided into multiple segments: a first insulation film with a first opening, a second insulation film with a second opening, and a third insulation film with a third opening. Each opening is positioned at different locations to selectively expose specific regions (emission region, non-emission region, and side surface region respectively), allowing precise control of current isolation without compromising overall film coverage.
Solution Approach 2:
The patent introduces a vertical stacking dimension by arranging multiple insulation films at different heights (first, second, and third openings at different positions in the vertical direction). This multi-layer approach enables three-dimensional control of current paths, isolating pixels effectively while maintaining comprehensive film coverage through strategic opening placement in each layer.
2Device complexity
If the organic layer is made thin to improve device structure, then current leakage increases, but device complexity increases with multiple insulation layers
Solution Approach 1:
Each insulation film layer provides different local functions: the first insulation film isolates the emission region, the second insulation film isolates the non-emission region, and the third insulation film isolates the side surface region. This localized quality approach ensures that each region receives targeted isolation exactly where needed, maximizing current leakage suppression efficiency without requiring excessive film thickness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses current leakage between pixels, enhances charge injection efficiency, and luminous efficiency, and reduces color mixing, and improves luminous efficiency, and reduces color mixing, thereby improving the light emission properties and reliability, and enhances the luminous efficiency and luminous efficiency, and reduces color mixing, thereby improving the light emission properties and reliability, and enhances the luminous efficiency and reduces color mixing.
Implementation Method 1
a light-emitting element comprising: a light-emitting layer which emits light by electroluminescence
Implementation Method 2
an electron-transport layer which is arranged between the electrode and the light-emitting layer and transports electrons
Data Source
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AI summary
A light-emitting element and a display device capable of improving the light emission property are provided. Each of a plurality of anode electrodes (11) is provided for a corresponding pixel. The pixel-isolating insulation film (12) has an opening (120) exposing corresponding one of the plurality of anode electrodes (11) to outside, and has an eave (123B) in the middle of a thickness direction of an inner wall of the opening (120). An organic layer (13) includes a CGL (132) cut by the eave (123B) of the pixel-isolating insulation film (12), and covers the opening (120). A cathode electrode (14) is disposed on a surface of the organic layer (13), the surface being a surface on the opposite side of the anode electrode (11).