Micro OLED Anode Protrusion Structure for Sub-Pixel Isolation
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Solution Overview
Problem
Existing Micro OLED display devices face issues with leakage and crosstalk between adjacent sub-pixels, which affect display performance.
Innovation Solution
The display substrate design includes an anode layer with a main body portion and a protrusion portion, where the protrusion portion is larger in a specific direction, and a pixel definition layer with symmetrically arranged protruding structures to minimize pixel openings, enhancing pixel isolation and reducing leakage and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel definition layer thickness is reduced to achieve high pixel density, then the display resolution is improved, but the isolation between adjacent sub-pixels deteriorates causing leakage and crosstalk
Solution Approach 1:
The patent introduces a protrusion portion that extends in the thickness direction (vertical dimension) to provide additional isolation between adjacent sub-pixels. This three-dimensional structure complements the planar pixel definition layer, creating a multi-level isolation system that maintains high resolution while preventing leakage and crosstalk through enhanced vertical separation.
2Length of moving object
If the pixel definition layer is made thinner to reduce overall device thickness, then the display device miniaturization is improved, but the optical pixel definition capability deteriorates
Solution Approach 1:
The pixel definition layer is segmented into a main body portion and a protrusion portion. The protrusion portion extends vertically to provide additional optical definition and isolation, while the main body portion maintains the thin-profile structure. This segmentation allows the device to achieve both miniaturization and enhanced optical pixel definition by distributing the definition function across different spatial locations.
Data Source
AI summary
A display substrate and a display device. The display substrate includes a driving substrate, an anode layer, a pixel definition layer, a light emitting functional layer, a cathode layer and an encapsulation layer; the driving circuit includes at least one transistor, the at least one transistor includes a semiconductor layer, the anode layer includes a plurality of anodes, the display substrate includes a plurality of pixel openings; the plurality of pixel openings are configured to at least overlap with the plurality of anodes; each of the anodes includes a main body portion and a protrusion portion, the protrusion portion is connected with the main body portion; the light emitting functional layer includes a plurality of light emitting portions which are arranged in contact with the main body portions of the plurality of anodes.