Dummy Electrode Layout for Pixel Leakage Current Redirection
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Solution Overview
Problem
Conventional display devices experience image quality degradation due to leakage current between neighboring pixels, leading to color mixing phenomena.
Innovation Solution
Incorporation of a dummy electrode between the substrate and trenches, with a voltage difference from neighboring electrodes, to redirect and reduce leakage current, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy electrode is added between neighboring pixels to reduce leakage current, then image quality is improved, but device complexity increases
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between neighboring pixels to intercept and redirect leakage current. The dummy electrode acts as a mediator that collects stray charges before they can cause color mixing between adjacent pixels, thereby improving image quality without requiring fundamental changes to the display architecture
Solution Approach 2:
The harmful leakage current is extracted and redirected to the dummy electrode. By providing a dedicated path for leakage current through the dummy electrode connected to ground or reference potential, the harmful effect of charge leakage is removed from the pixel regions, preventing color mixing while maintaining the overall device structure
2Reliability
If voltage is applied to the dummy electrode to redirect leakage current, then leakage current is reduced, but energy consumption increases
Solution Approach 1:
The dummy electrode is connected to different voltage potentials (ground, first driving voltage, or initialization voltage) to change the electrical parameters of the system. By adjusting the voltage applied to the dummy electrode, the leakage current is redirected along controlled paths, reducing harmful current while managing energy consumption through selective voltage application
Solution Approach 2:
The leakage current, which is originally a harmful effect causing color mixing, is converted into a beneficial controlled current path. By applying voltage to the dummy electrode, the leakage current is redirected to serve as a controlled discharge path, eliminating its harmful effects while requiring minimal additional energy compared to maintaining pixel operation
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 redirects leakage current, enhancing image quality by minimizing color mixing and improving overall 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
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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.