Touch Screen Panel Dummy Patterns for Reflectance Uniformity
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Solution Overview
Problem
The existing touch screen panel fabrication process is complex and requires multiple masks, and there is a significant reflectance difference between sensing patterns, which affects the uniformity of images displayed on devices like liquid crystal display panels.
Innovation Solution
A touch screen panel design where first and second sensing patterns are formed on different layers with dummy patterns in between, reducing the number of masks needed and improving reflectance uniformity by alternately disposing dummy patterns to match the layers of sensing patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If first and second sensing patterns are formed in the same layer with separate connection patterns through contact holes, then the sensing patterns can be connected, but more masks are required and the fabrication process becomes complicated
Solution Approach 1:
The patent moves the second sensing patterns from the same layer to a different layer (upper or lower layer) relative to the first sensing patterns. This dimensional transition eliminates the need for contact holes and separate connection patterns, reducing mask requirements and simplifying the fabrication process while maintaining electrical connectivity through the layered structure
Solution Approach 2:
The patent embeds the second sensing patterns within the layered structure formed by the first sensing patterns and insulating layers. The second sensing patterns are positioned between the first sensing patterns and the opposing substrate, creating a nested three-dimensional arrangement that integrates multiple sensing functions without requiring additional planar connection structures
2Measurement precision
If sensing patterns are formed to detect contact position, then touch input functionality is achieved, but reflectance difference between sensing patterns affects image uniformity
Solution Approach 1:
The patent introduces dummy sensing patterns in regions where no actual touch detection is needed (edge regions or non-active areas). These dummy patterns have the same optical properties as the functional sensing patterns but are positioned to reflect light in a controlled manner, compensating for the reflectance differences caused by the presence of active sensing patterns and thereby improving overall image uniformity
Solution Approach 2:
The patent creates a more homogeneous optical structure by distributing both functional and dummy sensing patterns across the touch screen panel. This uniform distribution of patterned and non-patterned regions ensures consistent light reflection characteristics across the entire display area, eliminating visual artifacts and improving image quality while preserving touch detection accuracy
Data Source
AI summary
A touch screen panel having an improved reflectance difference between sensing patterns. The touch screen panel includes a transparent substrate; a plurality of first sensing patterns on the transparent substrate and connected along a first direction; a first insulating layer on the first sensing patterns; and a plurality of second sensing patterns on the first insulating layer and connected along a second direction. The second sensing patterns are alternately disposed with the first sensing patterns and not overlapped with the first sensing patterns. The touch screen panel further includes a plurality of dummy patterns in at least one of first dummy regions between the first sensing patterns and second dummy regions between the second sensing patterns.