Display Device Second Electrode Shielding Clock Signal Noise
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Solution Overview
Problem
Conventional display devices face challenges in achieving uniform input sensitivity due to noise interference from clock signal lines, which affects the accuracy and consistency of touch inputs.
Innovation Solution
Incorporating a second electrode that overlaps the clock signal lines and is disposed on the pixel defining film, this electrode acts as a shielding layer to block noise from the clock signals, ensuring uniform input sensitivity across the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signal lines are disposed close to the display region to reduce wiring length and improve signal integrity, then electrical performance is improved, but noise interference to the input sensing layer increases
Solution Approach 1:
A second electrode is introduced as an intermediary shielding layer between the clock signal lines and the input sensing layer. This electrode overlaps with the clock signal lines in plan view and blocks electromagnetic noise from reaching the input sensing layer, thereby resolving the contradiction between maintaining signal integrity and reducing noise interference.
Solution Approach 2:
The patent utilizes the electromagnetic field generated by the clock signal lines and converts the harmful noise effect into a beneficial shielding effect by positioning the second electrode to overlap with the clock signal lines. The electrode acts as a shield that redirects or absorbs the electromagnetic interference, protecting the input sensing layer while maintaining the necessary electrical connections.
2Measurement precision
If a shielding electrode is added to block noise from clock signal lines, then input sensitivity uniformity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The second electrode serves multiple functions simultaneously: it acts as a shielding layer to block noise from clock signal lines, provides electrical connection between different layers, and maintains structural support. By combining multiple functions into a single component, the patent improves input sensitivity uniformity without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the shielding function with the existing electrode structure of the display device. The second electrode is integrated into the existing layer structure and combines with other functional layers, thereby achieving noise shielding without requiring a completely separate and complex shielding system.
3Object-affected harmful factors
If the second electrode completely overlaps the clock signal lines to maximize shielding effect, then noise blocking performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The second electrode is positioned to overlap specifically with the regions where clock signal lines are most prone to generating noise, rather than requiring complete and perfect overlap across all areas. This localized shielding approach maintains effective noise blocking while reducing the stringency of manufacturing alignment requirements.
Solution Approach 2:
The patent employs partial overlap between the second electrode and clock signal lines, which provides sufficient shielding performance without demanding perfect alignment. The excessive action of complete overlap is replaced by a optimized partial overlap that achieves the necessary noise blocking effect with more relaxed manufacturing tolerances.
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 second electrode effectively prevents noise interference, resulting in consistent and uniform input sensitivity, enhancing the accuracy of touch inputs and preventing changes in sensitivity patterns.
Implementation Method 1
the second electrode may be disposed on the pixel defining film and overlap at least one of the plurality of clock signal lines in a plan view
Data Source
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AI summary
Provided is a display device including a display panel and an input sensing layer. The input sensing layer includes an input sensor and a plurality of input sensing lines. The display panel includes a base layer, a circuit layer including a plurality of clock signal lines, a first electrode disposed between the clock signal lines and first input sensing lines and having a plurality of second holes defined therein, and a second electrode overlapping at least one of the clock signal lines in a plan view, thereby achieving uniform input sensitivity.