Shield Part for Touch Routing Lines in Display Devices
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Solution Overview
Problem
Existing touch screen display devices face issues with touch noise interference and deterioration in touch performance due to overlapping driving signals and design margins of cathode electrodes, which affect accuracy and stability of touch sensing.
Innovation Solution
An integrated touch screen display device is designed with a shield part that surrounds two opposite sides and the lower side of touch routing lines, blocking driving signal noise and preventing interference, thereby enhancing touch precision and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch routing lines are disposed in the non-display area, then touch detection function is enabled, but driving signal noise interferes with touch signals causing touch performance deterioration
Solution Approach 1:
A shield part is introduced as an intermediary element between the touch routing lines and the driving signals. The shield part includes a shield electrode that is grounded to block and divert electromagnetic noise from driving signals, preventing interference with touch detection signals while maintaining the routing lines in the non-display area for ease of operation
2Length of moving object
If cathode electrode design margin is reduced, then device thickness is minimized, but touch noise increases and touch precision deteriorates
Solution Approach 1:
The shield part serves as a protective intermediary layer that allows the cathode electrode to be positioned closer to the touch detection part without compromising touch performance. The shield electrode blocks noise paths, enabling reduced device thickness while maintaining touch sensing accuracy through active noise protection rather than relying solely on increased spacing
3Measurement precision
If shield part is added to block driving signal noise, then touch noise is reduced and touch precision is improved, but device structure becomes more complex
Solution Approach 1:
The shield part is merged with the existing encapsulation structure and grounding system of the display device. The shield electrode is integrated into the encapsulation layer stack and connected to existing ground potentials, achieving noise protection functionality without requiring completely separate structural elements, thus limiting the increase in device complexity
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
The shield part effectively reduces noise interference, improving touch signal-to-noise ratio and ensuring accurate and stable touch sensing by blocking driving signal noise, thus enhancing the overall touch performance and precision.
Implementation Method 1
a shield part disposed to surround two opposite sides and a lower side of one or more touch routing lines among the plurality of touch routing lines
Data Source
AI summary
A display device can include a substrate including a display area and a non-display area. The display device can further include a plurality of light-emitting elements disposed on the substrate, and a sealing layer disposed on the plurality of light-emitting elements. The display device also can include a touch detection part disposed on the sealing layer in the display area, and a plurality of touch routing lines connected to the touch detection part in the non-display area. Further, the display device can include a shield part disposed to surround two opposite sides and a lower side of one or more touch routing lines among the plurality of touch routing lines.