Touch Panel Substrate Grid Conducting Layer Light Leakage
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Solution Overview
Problem
Conventional in-cell touch panel substrates face challenges in achieving high sensing performance due to the design of sense and drive electrodes, which lead to decreased aperture ratio and increased light leakage, affecting the display's appearance and functionality.
Innovation Solution
A touch panel substrate design featuring first and second unit electrodes on the same plane, with a conducting layer forming a grid pattern that overlaps the electrodes, and an insulating light-blocking layer with wider lines at intervals to prevent light leakage and enhance aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conducting layer is used to electrically connect unit electrodes, then electrical conductivity is improved, but light leakage occurs through the conducting layer
Solution Approach 1:
The conducting layer is segmented into a grid pattern with lines extending in first and second directions, creating multiple discrete conductive paths rather than continuous large-area conductors. This segmentation maintains electrical connectivity while reducing light leakage by limiting the continuous conductive material coverage.
Solution Approach 2:
An insulating light-blocking layer is introduced as an intermediary element between the conducting layer and the external environment. This layer has light-blocking properties that prevent light leakage through the conducting layer while allowing the conducting layer to maintain its electrical function.
2Reliability
If the conducting layer lines are made wider to improve electrical connection, then electrical conductivity is improved, but the aperture ratio decreases
Solution Approach 1:
The width of the conducting layer lines is optimized to a specific range (50-200 nm) that balances electrical conductivity requirements with aperture ratio requirements. This parameter optimization ensures sufficient electrical connection while minimizing the impact on aperture ratio.
Solution Approach 2:
The patent uses a composite structure combining the conducting layer with the insulating light-blocking layer. The conducting layer provides electrical connectivity while the insulating layer provides light-blocking function, creating a composite material system that achieves multiple functions simultaneously.
3Object-generated harmful factors
If an insulating light-blocking layer is added to prevent light leakage, then light leakage is reduced, but device complexity increases
Solution Approach 1:
The insulating light-blocking layer serves multiple functions simultaneously: it blocks light leakage through the conducting layer, provides electrical insulation between conductive elements, and maintains the structural integrity of the touch panel substrate. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The patent merges the light-blocking function and insulation function into a single insulating light-blocking layer, rather than using separate layers for each function. This consolidation reduces device complexity while achieving the desired light leakage prevention.
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 solution results in a touch panel substrate with a high aperture ratio and improved appearance by reducing light leakage through the conducting layer, enhancing the display device's performance and visual quality.
Implementation Method 1
lines of an insulating light-blocking layer that are wider than those of the conducting layer being provided at predetermined intervals
Implementation Method 2
the first electrodes being each formed by a plurality of the first unit electrodes electrically connected to each other via a conducting layer
Implementation Method 3
a position detection electrode that detects, based on a change in capacitance, a position on coordinates as indicated by an object to be detected
Data Source
AI summary
A conducting layer (7) is formed in a shape of a grid having a predetermined width of lines extending along the first direction (horizontal direction in the drawing) and the second direction (vertical direction in the drawing). In a region that, when seen in planar view, overlaps those lines of the conducting layer (7) which extend along the first direction, lines of an insulating light-blocking layer (6) that are wider than those of the conduction layer (7) are arranged at predetermined intervals along the second direction. The conducting layer (7) is broken at predetermined places in a region that overlaps the insulating light-blocking layer 6 when seen in plane view. This makes it possible to achieve a liquid crystal display device including a touch panel substrate that has a high aperture ratio and that can suppress leakage of light through cuts in a conducting layer.