Display Device Electrode Overlap for Light Blocking
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Solution Overview
Problem
Current organic light-emitting display devices suffer from uneven brightness due to light reflection affecting the current stability of driving transistors.
Innovation Solution
The display device incorporates a specific structure where the first electrode at least partially overlaps the gate electrode, with carefully designed projection profiles and insulation layers to block light and stabilize the driving transistor's channel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the first electrode is positioned to overlap the gate electrode with specific projection profiles, then the brightness uniformity is improved by blocking light reflection, but the device structure becomes more complex
Solution Approach 1:
The device is divided into distinct functional layers with specific projection profiles. The first electrode, gate electrode, and insulation layers are segmented into separate components with defined spatial relationships, where each layer serves a specific function in controlling light reflection and electrical operation independently.
Solution Approach 2:
The patent introduces a vertical dimension to the electrode arrangement by specifying projection profiles on the substrate plane. The first electrode and gate electrode are positioned in different vertical layers with their projections intersecting at specific points, creating a three-dimensional spatial configuration that blocks light reflection paths while maintaining electrical functionality.
2Reliability
If insulation layers are added between electrodes to prevent light reflection, then the current stability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The first insulation layer acts as an intermediary component positioned between the first electrode and the gate electrode. This intermediate layer serves dual functions: it provides electrical insulation to prevent unwanted current paths and structurally positions the electrodes to block light reflection, thereby stabilizing the driving transistor current without requiring complex active control mechanisms.
3Illumination intensity
If the first electrode overlaps the gate electrode to block light, then the brightness uniformity is improved, but the area occupied by the display device increases
Solution Approach 1:
The patent applies local quality by positioning the first electrode to overlap the gate electrode only in specific regions where light reflection occurs. The projection profiles are designed to intersect at specific points, creating localized blocking zones rather than uniform coverage across the entire display area. This allows light blocking to be applied precisely where needed without unnecessarily increasing the overall display area.
Data Source
AI summary
A display device is provided. The display device includes a substrate, a driving transistor, a first insulation layer, a first electrode and a second insulation layer. The driving transistor is disposed on the substrate and includes a gate electrode, and the gate electrode projects a first projection profile on the substrate. The first insulation layer is disposed on the driving transistor. The first electrode is disposed on the first insulation layer, and projects a second projection profile on the substrate. The second insulation layer is disposed on the first electrode and the first insulation layer. The second insulation layer has an opening, the opening exposes a portion of the first electrode, and the opening projects a third projection profile on the substrate.