Display Sensor Electrode Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Existing display devices face challenges in reducing parasitic capacitance, which can affect the reliability of electrical signals and increase the risk of electrical signals, while also having a significant dead space and requiring improved process convenience.
Innovation Solution
The display device incorporates a conductive pattern layer overlapping a shielding layer with a transparent intermediate layer, including a light controlling layer and color conversion layers, and a shielding layer connected to a connection electrode, with a sensor part featuring sensing electrodes and trace lines in the display area to reduce parasitic capacitance and dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor part is formed in the display device with sensing electrodes and conductive pattern layers, then the sensor functionality is improved, but parasitic capacitance increases affecting electrical signal reliability
Solution Approach 1:
A transparent intermediate layer is introduced between the shielding layer and the conductive pattern layer of the sensor part. This intermediate layer acts as a mediator that reduces the parasitic capacitance formed between the shielding layer and the sensor's conductive patterns, thereby improving electrical signal reliability while maintaining sensor functionality.
Solution Approach 2:
The patent utilizes the transparent intermediate layer to convert the harmful effect of parasitic capacitance into a beneficial structure. By strategically positioning this layer, the design reduces unwanted electrical interference while maintaining the necessary sensor functionality and display performance.
2Reliability
If the shielding layer is extended to reduce parasitic capacitance, then electrical signal reliability is improved, but dead space increases reducing display area
Solution Approach 1:
The transparent intermediate layer is selectively positioned only in specific regions where parasitic capacitance reduction is most critical, rather than extending the shielding layer uniformly across the entire display. This localized approach reduces parasitic capacitance effects while minimizing the increase in dead space, preserving maximum display area.
3Reliability
If multiple layers including transparent intermediate layer and light controlling layer are added, then parasitic capacitance is reduced and light control is improved, but device complexity increases
Solution Approach 1:
The transparent intermediate layer serves multiple functions simultaneously: it reduces parasitic capacitance between the shielding layer and sensor patterns, maintains optical transparency for display visibility, and provides structural support. This multi-functionality reduces the need for separate dedicated layers, thereby managing device complexity while achieving multiple technical goals.
Data Source
AI summary
A display device includes a display part configured to emit light, and a sensor part including sensing electrodes disposed on the display part and formed by a conductive pattern layer. The display part includes a light emitting element including a first end and a second end, a first connection electrode electrically connected to the first end, a second connection electrode electrically connected to the second end, and a shielding layer electrically connected to the second connection electrode. The conductive pattern layer overlaps the shielding layer in a plan view.