Touch Sensing Wiring Lines in LED Display Substrates
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Solution Overview
Problem
Outdoor display apparatuses with touch-input functions face challenges in maintaining image quality and transparency due to the thickness and structural requirements of incorporating a touch sensing panel in LED display structures.
Innovation Solution
A display apparatus with a first and second substrate, where light emitting elements are arrayed in a matrix on the first substrate, and touch sensing wiring lines are integrated between the substrates, insulated at intersections to prevent electrical connection, allowing for touch input sensing and adjustment of light emitting characteristics without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensing panel is stacked on the display to enable touch-input function, then the touch sensing capability is improved, but the whole thickness of the display increases and image quality deteriorates
Solution Approach 1:
The patent merges the touch sensing function with the existing display structure by integrating touch sensing wiring lines into the same substrate as the light emitting elements. This combination eliminates the need for a separate stacked touch sensing panel, thereby maintaining thin profile while enabling touch-input capability.
Solution Approach 2:
The display substrate is designed to serve multiple functions simultaneously: it acts as both the light emitting structure and the touch sensing structure. The wiring lines on the substrate perform dual roles of driving light emitting elements and sensing touch inputs, achieving multi-functionality in a single component.
2Adaptability or versatility
If a touch sensing panel is stacked on the display to enable touch-input function, then the touch sensing capability is improved, but transparency deteriorates
Solution Approach 1:
By combining the touch sensing function with the existing transparent display substrate rather than adding a separate panel, the patent maintains the transparency characteristics of the original display while enabling touch-input capability.
3Adaptability or versatility
If wiring lines are arranged to intersect on the substrate, then the circuit design flexibility is improved, but electrical insulation becomes difficult and manufacturing complexity increases
Solution Approach 1:
The patent applies insulating films selectively at specific locations where wiring lines intersect or are in close proximity, rather than covering the entire substrate. This localized insulation approach maintains circuit design flexibility while managing electrical insulation requirements and reducing manufacturing complexity.
Data Source
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AI summary
There is provided a display apparatus including a first substrate, a second substrate arranged to be in parallel with the first substrate, a plurality of light emitting elements arrayed in a matrix form on a surface of the first substrate facing the second substrate, a light-emitting-device driving wiring line formed on the surface of the first substrate, which outputs a driving signal to the plurality of light emitting elements to selectively turn on and off the plurality of light emitting elements, a touch sensing wiring line formed between the first substrate and the second substrate, arrayed to intersect the light-emitting-device driving wiring line, which outputs a sensing signal corresponding to a touch input of a user and a plurality of insulators provided in a plurality of areas on the light-emitting-device driving wiring line or the touch sensing wiring line.