Sensing Layer Overlap for Display Electrode Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices suffer from afterimage phenomena due to the connection issues between light emitting devices and circuits, which affect the reliability and longevity 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, bridge patterns, and a separator to improve the electrical connectivity and reduce afterimage effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting devices are connected to circuits in conventional display panels, then the display function is achieved, but afterimage phenomena occur and reliability deteriorates
Solution Approach 1:
The patent segments the second electrode into multiple isolated electrode islands rather than a continuous layer. The separator divides the display region into multiple regions, with each region containing discrete electrode islands that are electrically isolated from each other. This segmentation prevents the formation of large continuous charge accumulation areas, thereby reducing afterimage phenomena while maintaining light emission function.
Solution Approach 2:
The separator acts as an intermediary element between adjacent electrode regions. It physically divides the display panel into multiple regions and electrically isolates the electrode islands, preventing harmful charge leakage and accumulation between regions. This intermediary structure reduces afterimage effects while enabling proper light emission control.
2Duration of action of stationary object
If continuous second electrode is formed for light emission, then light emission efficiency is maintained, but afterimage phenomena increase and device lifetime decreases
Solution Approach 1:
The continuous second electrode is divided into multiple discrete electrode islands separated by the separator. Each electrode island operates independently within its own region, preventing charge accumulation that causes afterimages. This segmentation extends device lifetime by reducing electrical stress and heat accumulation while maintaining overall light emission efficiency.
Solution Approach 2:
Different regions of the display panel have locally optimized electrode structures. Each region contains electrode islands with specific sizes and positions tailored to local requirements, allowing independent control of light emission characteristics. This local quality approach enables reduced afterimage effects in each region while maintaining overall display performance.
3Measurement precision
If sensing electrodes are added to detect display issues, then measurement precision improves, but device complexity increases
Solution Approach 1:
The separator serves multiple functions simultaneously: it divides the display region into multiple regions, electrically isolates electrode islands to prevent afterimages, and provides a structural platform for positioning sensing electrodes. This multi-functionality reduces device complexity by combining several functions into a single element rather than adding separate components.
Solution Approach 2:
The sensing electrodes are integrated into the existing display layer structure, merging the sensing function with the light emission and separation functions. The sensing electrodes are positioned to overlap with the separator and electrode islands, allowing detection of electrical characteristics without requiring separate sensing structures, thereby reducing overall device complexity.
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.