Display Device Sensor Layer Dummy Pattern Interference Blocking
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Solution Overview
Problem
Display devices face reliability issues due to deformation of the display panel affecting the shape and functionality of integrated sensors, leading to potential noise in touch coordinates sensed by the sensors.
Innovation Solution
The display device incorporates a sensor layer with a dummy pattern and guard patterns located between power supply patterns, ensuring that sensing lines do not overlap with the dummy pattern, and are electrically connected to power supply patterns, which helps in blocking signal interference from adjacent signal lines, thereby enhancing signal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing lines are routed through the peripheral region without dummy patterns, then device complexity is reduced, but measurement precision deteriorates due to signal interference from adjacent signal lines
Solution Approach 1:
A dummy pattern is introduced as an intermediary element between the sensing line and the power supply pattern. This dummy pattern acts as a mediator that blocks electromagnetic interference from the power supply pattern from reaching the sensing line, thereby improving measurement precision without requiring fundamental changes to the sensor layer structure.
Solution Approach 2:
The dummy pattern is designed as a simple, easy-to-manufacture structure that can be readily integrated into the existing sensor layer. It uses the same material and formation process as the sensing electrode, making it a cost-effective solution that does not require additional manufacturing steps or complex structures.
2Reliability
If sensing lines overlap with power supply patterns, then ease of manufacture is improved, but reliability deteriorates due to signal interference and noise
Solution Approach 1:
The dummy pattern serves as a protective intermediary positioned between the sensing line and the power supply pattern. It blocks interference signals from the power supply pattern, ensuring reliable sensing signals without complicating the manufacturing process, as the dummy pattern is formed using the same materials and processes as existing sensor components.
Solution Approach 2:
The sensor layer is segmented into functional zones: the sensing region with sensing electrodes and lines, the dummy pattern region that acts as an interference barrier, and the power supply region. This segmentation allows each zone to perform its specific function while maintaining ease of manufacture through standardized formation processes.
3Measurement precision
If guard patterns are added to block interference, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The dummy pattern performs multiple functions: it blocks electromagnetic interference from power supply patterns, maintains electrical isolation between different sensor components, and can be formed using the same material and process as the sensing electrode. This multi-functionality improves measurement precision without significantly increasing device complexity.
4Reliability
If sensing lines are kept away from power supply patterns, then reliability is improved, but area of the sensor layer increases
Solution Approach 1:
The dummy pattern is strategically positioned only in specific locations where interference from power supply patterns occurs, rather than uniformly across the entire sensor layer. This localized approach blocks interference where needed while minimizing the additional area required, maintaining high signal reliability without excessive area increase.
Data Source
AI summary
A display device includes: a display layer having an active region, and a peripheral region including a first region, a second region spaced from the first region in a first direction, and a third region between the first region and the second region; and a sensor layer on the display layer. The display layer includes: a plurality of pixels at the active region; and a power supply pattern at the peripheral region, and including: a first power supply pattern at the first region; and a second power supply pattern at the second region. The sensor layer includes: a plurality of sensing electrodes at the active region; a plurality of sensing lines including: a first sensing line at the first region; and a second sensing line at at least one of the first region or the second region; and a dummy pattern at the third region.