Input Sensing Unit With Differential Line Widths For Display Modules
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Solution Overview
Problem
Existing display devices face challenges in enhancing sensing reliability for external inputs due to the limitations in the design of input sensing units, particularly in terms of conductive pattern arrangements and line widths, which affect capacitance and visibility.
Innovation Solution
The implementation of a display module with an input sensing unit featuring a combination of first and second conductive patterns with varying line widths and shapes, including irregular groups and notch patterns, to improve sensing reliability and capacitance, while maintaining visibility by adjusting line widths within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the line width of conductive patterns is increased to improve sensing reliability and capacitance, then the sensing performance is enhanced, but the visibility of the display is compromised
Solution Approach 1:
The patent applies different line widths to different conductive patterns based on their location and function. First conductive patterns have a first line width while second conductive patterns have a second line width greater than the first. This local differentiation allows regions requiring higher capacitance (second conductive patterns) to have wider lines for better sensing, while regions where visibility is prioritized (first conductive patterns) maintain narrower lines, thus resolving the contradiction between sensing reliability and visibility.
2Measurement precision
If the line width of conductive patterns is increased to improve capacitance, then the sensing accuracy is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The conductive patterns are segmented into two distinct groups: first conductive patterns and second conductive patterns. Each group serves a specific sensing function and has an optimized line width appropriate for its role. This segmentation allows the system to achieve high sensing accuracy through differentiated design without requiring all patterns to be complex, thereby managing manufacturing complexity while improving measurement precision.
Solution Approach 2:
Different line widths are assigned to different conductive patterns based on their specific sensing requirements. The second conductive patterns have greater line width to provide higher capacitance for specific sensing needs, while first conductive patterns maintain smaller line widths. This localized optimization achieves high sensing accuracy where needed without uniformly increasing complexity across the entire display structure.
3Reliability
If irregular shaped conductive patterns are used to improve sensing reliability at the edges, then the sensing coverage is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The conductive patterns are divided into first conductive patterns with smaller line widths and second conductive patterns with greater line widths. The second conductive patterns, which may have irregular shapes for edge coverage, have larger dimensions that make them more tolerant to manufacturing variations. This segmentation allows irregular shapes to be used where needed without uniformly increasing precision requirements across all patterns.
Solution Approach 2:
The line width parameter is changed between different conductive patterns. Second conductive patterns have a greater line width parameter compared to first conductive patterns. This parameter change makes the irregularly shaped second patterns more robust to manufacturing tolerances, as larger features are inherently easier to fabricate with consistent precision, thereby reducing overall manufacturing precision requirements while maintaining sensing reliability.
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 enhances the sensing reliability and capacitance of the input sensing unit, improving the accuracy of external input detection without compromising visibility, thereby addressing the limitations of existing technologies.
Implementation Method 1
an input sensing unit disposed on the display panel and having a sensing area and a non-sensing area adjacent to the sensing area
Data Source
AI summary
A display module including a display panel, and an input sensing unit disposed on the display panel and having a first sensing area and a second sensing area adjacent to the first sensing area, the input sensing unit including a first conductive pattern overlapping the first sensing area, and a second conductive pattern overlapping the sensing area, in which each of the first conductive patterns and the second conductive patterns includes mesh lines at least some of which define openings, and the second conductive pattern has a line width greater than that of each of the first conductive patterns in a plan view.