Touch Window Electrode Pattern Structure for Visibility
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Solution Overview
Problem
Existing touch windows suffer from inferior visibility and security issues due to the visibility of electrode patterns, which are not adequately masked by current materials and designs, especially with the increasing demand for multi-touch functionality.
Innovation Solution
A touch window design that incorporates a ratio of 10% to 20% space area between unit cell electrode patterns, with a dummy pattern in the space area that does not receive touch input, using materials like polyethylene terephthalate (PET), polycarbonate (PC), polyether sulfone (PES), polyimide (PI), and polymethyl methacrylate (PMMA) for the dummy pattern, and conductive materials for the electrode patterns, to prevent the electrode patterns from being viewed externally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the interval between adjacent electrode patterns is increased to facilitate manufacturing and assembly, then the ease of manufacture is improved, but the visibility of electrode patterns increases causing inferior visibility and security issues
Solution Approach 1:
A black matrix layer is introduced as an intermediary substance between the electrode patterns and the external environment. This layer selectively absorbs light and prevents the electrode patterns from being viewed from the front, while still allowing the touch sensor to detect touches through the conductive elements. The black matrix thus mediates between the need for visible display and the need for electrode functionality.
Solution Approach 2:
The space between electrode patterns is selectively filled with black matrix material to create local optical properties. Rather than making the entire display opaque, only the specific regions containing electrode patterns are treated with the black matrix, allowing other areas to remain transparent for normal display functionality. This localized treatment resolves the contradiction by affecting only where necessary.
2Measurement precision
If the electrode pattern density is increased to improve touch sensing accuracy, then the measurement precision is improved, but the visibility of electrode patterns increases causing security leaks
Solution Approach 1:
The black matrix serves as an intermediary that allows high-density electrode patterns to be implemented for improved touch sensing accuracy while simultaneously preventing these patterns from being visible. The black matrix layer absorbs light in the regions of the dense electrode patterns, preventing information leakage while maintaining the functional density needed for accurate multi-touch detection.
3Illumination intensity
If the space area between unit cell electrode patterns is increased to improve visibility, then the visibility is improved, but the electrode pattern becomes more easily viewed causing security problems
Solution Approach 1:
The black matrix is applied as an intermediary layer that fills the spaces between electrode patterns. This prevents light from passing through these spaces and revealing the electrode structure behind, while maintaining overall display visibility. The black matrix thus resolves the contradiction by selectively blocking light paths that would expose electrode patterns while preserving normal display functionality.
Data Source
AI summary
Disclosed is a touch window. The touch window includes a cover window, a first sensing electrode layer formed on a view area (V/A) of the cover window and including a first electrode pattern including a first unit cell electrode pattern, and a second sensing electrode layer formed on the view area and including a second electrode pattern which crosses the first electrode pattern and includes a second unit cell electrode pattern. A ratio of an area of the space part between a first unit cell electrode pattern and a second unit cell electrode pattern adjacent to the first unit cell electrode pattern with respect to an area of the first unit cell electrode pattern of the first electrode pattern or the second unit cell electrode pattern of the second electrode pattern is in the range of 10% to 20%.