Display Device Shielding Conductive Layers for Sensing Signal Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with sensing layers face challenges in improving the sensitivity of the sensing layer due to noise propagation from signal lines, which affects the accuracy and reliability of external input detection.
Innovation Solution
The use of conductive layers in the voltage supply lines, where the first lower and second upper conductive layers overlap each other, forms a shield between the signal lines and the sensing signal lines, preventing noise propagation and allowing the sensing signal lines to be formed in areas not overlapped by the second electrode, thereby enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensing signal lines are disposed close to signal lines for compact layout, then device area is reduced, but noise propagation from signal lines to sensing signal lines increases, deteriorating sensing sensitivity
Solution Approach 1:
A shielding conductive layer is introduced as an intermediary element between the signal lines and sensing signal lines. This shielding layer acts as a mediator that blocks electromagnetic noise propagation from the signal lines to the sensing signal lines, allowing the sensing lines to be positioned closer to signal lines without compromising sensing sensitivity.
Solution Approach 2:
The shielding function is extracted from the existing electrode structures and implemented as a separate, dedicated conductive layer. This extracted shielding layer specifically addresses the noise interference problem without interfering with the primary functions of the electrodes, enabling independent optimization of both signal transmission and sensing performance.
2Measurement precision
If shielding structures are added between signal lines and sensing signal lines to reduce noise, then sensing sensitivity is improved, but device complexity increases
Solution Approach 1:
The shielding conductive layer is designed to serve multiple functions simultaneously: it provides electromagnetic shielding for the sensing signal lines, maintains electrical connectivity through vias, and can be integrated with existing electrode patterns. This multi-functionality reduces the need for separate dedicated shielding structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The shielding conductive layer is merged with the existing electrode structures and conductive patterns in the display device. By combining the shielding function with existing conductive elements rather than adding completely separate shielding structures, the increase in device complexity is minimized while still achieving effective noise reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces noise interference, allowing for improved sensitivity and accuracy in detecting external inputs by the sensing layer, enhancing the overall performance of the display device.
Implementation Method 1
the first lower conductive layer and the second upper conductive layer overlap each other... forms a shield between the signal lines and the sensing signal lines, preventing noise propagation
Data Source
AI summary
A display device including: a substrate; a pixel circuit; a light emitting element including a first electrode, a light emitting; layer, and a second electrode: signal lines; a first voltage supply line overlapping the signal lines, configured to supply a first voltage to the pixel circuit, and, including first lower and upper conductive layers; a second voltage supply overlapping the signal lines, configured to supply a second voltage to the second electrode, and including a second lower conductive layer on a same layer as the first lower conductive layer and a second upper conductive layer on the second lower conductive layer on a same layer as the first upper conductive layer, an encapsulation layer on the second electrode, and the first and second voltage supply lines; and sensing signal lines on the encapsulation layer, the first lower conductive layer and the second upper conductive layer overlapping each other.