Display Layer and Sensing Electrode Structure for Afterimage Reduction
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Solution Overview
Problem
Existing display devices suffer from afterimage phenomena, which affect the reliability and performance of the display panel.
Innovation Solution
The display device incorporates a display layer with a sensing layer that includes intersecting first and second sensing electrodes, a transistor, and a light emitting device with specific electrode configurations and a separator to improve electrical connections and reduce afterimage effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display layer structure is used, then the device structure is simple, but afterimage phenomena occur affecting reliability
Solution Approach 1:
The display layer is segmented into multiple functional sub-layers: a first display sub-layer containing first sensing electrodes for detecting touch input, a second display sub-layer containing second sensing electrodes for additional sensing, and a light emitting sub-layer. This segmentation allows each sub-layer to perform its specific function independently, reducing afterimage phenomena while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
A common electrode is introduced as an intermediary component that electrically connects both the first sensing electrodes in the first display sub-layer and the second sensing electrodes in the second display sub-layer. This intermediary structure enables coordinated operation of the sensing layers, improving reliability by reducing afterimage effects while maintaining a manageable device architecture.
2Reliability
If sensing electrodes are added to reduce afterimage phenomena, then reliability improves, but device complexity increases
Solution Approach 1:
The common electrode serves multiple functions simultaneously: it acts as an electrical connection for the first sensing electrodes, a connection for the second sensing electrodes, and provides a reference potential for both sensing layers. This multi-functionality allows reliability improvement through enhanced sensing capability while avoiding the complexity increase that would result from adding separate connection structures for each sensing layer.
Data Source
AI summary
A display device includes a display layer that displays an image, and a sensing layer that is disposed on the display layer and includes a plurality of first sensing electrodes and a plurality of second sensing electrodes intersecting the plurality of first sensing electrodes. The display layer may include a transistor, a light emitting device, which includes a first electrode, an intermediate electrode disposed on the first electrode, and a second electrode disposed on the intermediate electrode, a pixel defining film, in which an emission opening portion overlapping a portion of the first electrode is defined, and a separator which is disposed on the pixel defining film and interrupting a continued formation of the second electrode. The plurality of first sensing electrodes and the plurality of second sensing electrodes may overlap the separator.