Dummy Electrode Voltage Compensation for Display Brightness Uniformity
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Solution Overview
Problem
Display devices struggle to maintain uniform brightness due to current-resistance (IR) drops caused by increased resistance in light emitting elements.
Innovation Solution
A display device with a display panel featuring light emitting elements and an input sensing layer, including a sensing electrode and a dummy electrode insulated from the sensing electrode, which applies a uniform driving voltage to the light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional input sensing layer is used without a dummy electrode, then the device complexity is lower, but the brightness uniformity deteriorates due to IR drops in light emitting elements
Solution Approach 1:
The input sensing layer is segmented into multiple functional components: a sensing electrode for touch detection and a dummy electrode for voltage compensation. This segmentation allows each electrode to perform its specialized function, with the dummy electrode specifically addressing IR drop compensation to improve brightness uniformity without interfering with the sensing electrode's touch detection capability.
Solution Approach 2:
The dummy electrode acts as an intermediary element between the power supply and the light emitting elements. It provides an additional electrical pathway that compensates for voltage drops occurring in the light emitting elements, thereby maintaining uniform brightness across the display without requiring changes to the core sensing functionality.
2Manufacturing precision
If the dummy electrode is electrically connected to the second electrode of light emitting elements, then the voltage uniformity improves, but the electrical complexity of the input sensing layer increases
Solution Approach 1:
The dummy electrode is merged with the input sensing layer structure and shares the same insulating layer and substrate integration as the sensing electrode. This merging approach allows the dummy electrode to be fabricated using similar processes and materials, reducing overall manufacturing complexity while still providing the necessary electrical connection for voltage compensation.
Solution Approach 2:
The input sensing layer is designed with multi-functionality: it simultaneously performs touch sensing through the sensing electrode and voltage compensation through the dummy electrode. Both electrodes are insulated from each other but share the same structural framework, allowing a single layer to serve multiple purposes and reduce the need for additional separate components.
3Measurement precision
If the dummy electrode is insulated from the sensing electrode, then the touch sensing accuracy is maintained, but the structural complexity of the input sensing layer increases
Solution Approach 1:
Both the sensing electrode and dummy electrode are maintained at different electrical potentials to prevent interference. The sensing electrode operates at a potential optimized for touch detection, while the dummy electrode operates at a potential optimized for voltage compensation. This equipotential design ensures that the electric fields generated by each electrode do not interfere with the other's function, maintaining touch sensing accuracy while enabling voltage uniformity.
Solution Approach 2:
An insulating layer serves as an intermediary between the sensing electrode and dummy electrode, physically separating them while allowing both to coexist within the same input sensing layer structure. This insulating layer prevents electrical interference between the two electrodes while maintaining structural integration, thereby preserving touch sensing accuracy without requiring completely separate structures.
Data Source
AI summary
A display device includes a display panel including a light emitting element, and an input sensing layer including a sensing electrode and a dummy electrode insulated from the sensing electrode and disposed on the display panel. The light emitting element includes a first electrode, a second electrode disposed on the first electrode, and a light emitting layer interposed between the first electrode and the second electrode. The second electrode is electrically connected to the dummy electrode.