Dummy Electrode Layout for Pixel Leakage Isolation in Displays
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Solution Overview
Problem
Leakage current between neighboring pixels in display devices reduces image quality by causing color mixing phenomena.
Innovation Solution
Incorporation of a dummy electrode adjacent to trenches between neighboring sub-pixels, which redirects leakage current through an electric field, collecting charges and reducing the current flow between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trench structure is used to separate neighboring pixels, then pixel isolation is improved, but leakage current between pixels increases
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between neighboring pixels. This dummy electrode acts as a mediator that intercepts and redirects leakage current that would otherwise flow between adjacent pixel electrodes through the trench structure, thereby maintaining pixel isolation while reducing harmful leakage current.
Solution Approach 2:
The invention converts the harmful leakage current into a beneficial effect by guiding it through the dummy electrode to a designated discharge path. The leakage current that would normally degrade image quality is instead channeled through the dummy electrode to a reference potential, transforming a harmful phenomenon into a controlled electrical path that improves overall device performance.
2Measurement precision
If pixel density is increased to improve resolution, then image quality is improved, but leakage current between neighboring pixels increases
Solution Approach 1:
The dummy electrode serves as an intermediary structure that becomes increasingly important as pixel density increases. With smaller pitch between pixels, the dummy electrode positioned between adjacent pixels provides a localized interception point for leakage current, preventing it from affecting neighboring high-density pixels and maintaining image quality despite increased pixel crowding.
Solution Approach 2:
The dummy electrode introduces local quality variation into the pixel structure. By placing conductive elements with specific electrical properties at critical locations between pixels, the invention creates localized zones that manage leakage current differently from the rest of the pixel structure, allowing high-resolution design while controlling harmful electrical effects at the micro-level.
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 dummy electrode effectively minimizes leakage current, enhancing image quality by preventing color mixing and improving display performance.
Implementation Method 1
a dummy electrode disposed between the substrate and the trench, and between the plurality of first electrodes, wherein a voltage applied to the dummy electrode and a voltage applied to the plurality of first electrodes are different
Data Source
AI summary
A display device includes a substrate, first electrodes disposed on the substrate, a pixel defining layer disposed on the first electrodes and having a trench, a light emitting stack disposed on the first electrode and the pixel defining layer, and a dummy electrode disposed between the substrate and the trench, and between the first electrodes, wherein a voltage applied to the dummy electrode and a voltage applied to the first electrodes are different.