Embedded Touch Screen Display Reducing Parasitic Capacitance
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Solution Overview
Problem
In display devices with embedded touch screens, parasitic capacitance increases due to the proximity of touch electrodes and light emitting elements, leading to performance issues.
Innovation Solution
A display panel design with a light emitting element layer, an encapsulation layer, and a touch sensing layer, where the second electrode has an opening area that overlaps touch electrodes, reducing parasitic capacitance and maintaining resistance by electrical connection to an auxiliary electrode in the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes are formed close to light emitting elements in an embedded touch screen, then touch sensing capability is improved, but parasitic capacitance increases
Solution Approach 1:
The patent extracts the harmful overlapping region between the second electrode and touch electrodes by forming openings in the second electrode. This removes the source of parasitic capacitance while preserving the necessary electrical connection areas, thus reducing parasitic capacitance without completely isolating the electrodes.
Solution Approach 2:
The patent applies local quality by creating a non-uniform second electrode structure with openings only in specific regions where touch electrodes are located. The second electrode maintains continuity in other areas to preserve electrical connection, achieving local optimization to reduce parasitic capacitance only where harmful while maintaining functionality elsewhere.
2Object-generated harmful factors
If the second electrode is opened to reduce parasitic capacitance, then parasitic capacitance decreases, but resistance increases
Solution Approach 1:
The patent segments the second electrode into multiple regions: opened areas where touch electrodes are located to reduce parasitic capacitance, and continuous connection areas to maintain electrical connectivity. This segmentation allows the electrode to simultaneously achieve low parasitic capacitance and low resistance by distributing different functions to different regions.
Solution Approach 2:
The second electrode serves multiple functions: it acts as a light emitting element electrode, provides electrical connection pathways, and selectively overlaps with touch electrodes. By making the second electrode multi-functional with both opened and continuous regions, it achieves both parasitic capacitance reduction and resistance maintenance within the same structure.
Data Source
AI summary
A display panel with an embedded touch screen and a display device comprising the display panel can decrease parasitic capacitance. The display panel with an embedded touch screen includes a light emitting element layer that is disposed on a substrate including an emission area and a non-emission area, an encapsulation layer that is disposed on the light emitting element layer, and a touch sensing layer that is disposed on the light emitting element layer. The light emitting element layer includes a first electrode that is disposed in the emission area on the substrate, a light emitting layer that is disposed on the first electrode, and a second electrode that is disposed on the light emitting layer and has an opening area provided in a part of the non-emission area.