Display Input Sensor Meshes with Recesses for Light Extraction
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Solution Overview
Problem
The integration of a conductive input sensor on a display panel adversely affects light extraction efficiency and external light reflection ratio in display devices.
Innovation Solution
The input sensor is designed with a specific layer structure that includes conductive layers with recesses and mesh openings to minimize interference with the emission area, using different materials for the conductive layers and incorporating trace lines with smaller linewidths to reduce bezel width and enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conductive input sensor is integrated on the display panel, then touch sensitivity is improved, but light extraction efficiency deteriorates
Solution Approach 1:
The conductive layer is divided into mesh patterns with openings instead of continuous structures. This segmentation allows light to pass through the openings while the mesh patterns maintain the conductive function for touch sensing, thus resolving the contradiction between touch sensitivity and light extraction efficiency
Solution Approach 2:
Different regions of the conductive layer have different properties: the mesh patterns provide conductivity while the openings provide light transmission. This local differentiation allows each part to optimize its function, with conductive regions maintaining touch sensitivity and open regions maximizing light extraction
2Measurement precision
If a conductive input sensor is integrated on the display panel, then touch sensing function is improved, but external light reflection ratio deteriorates
Solution Approach 1:
The conductive layer is segmented into mesh patterns rather than continuous structures. This segmentation reduces the total surface area that can reflect external light, thereby improving the external light reflection ratio while maintaining touch sensing capability through the distributed mesh patterns
Solution Approach 2:
The mesh pattern structure creates a porous-like configuration with openings that allow light to pass through rather than reflect. This structure reduces harmful light reflections while maintaining the conductive pathways necessary for touch sensing
3Ease of manufacture
If wider conductive layers are used for the input sensor, then manufacturing ease is improved, but bezel width increases
Solution Approach 1:
The conductive layer is segmented into mesh patterns with controlled linewidths. This allows the sensor to achieve adequate touch sensitivity through the distributed mesh structure while maintaining narrow overall dimensions, thus reducing bezel width while remaining manufacturable
Solution Approach 2:
The conductive function is distributed across multiple layers (first and second sensor conductive layers) rather than relying on a single wide layer. This multi-layer approach allows each layer to have narrower linewidths, reducing bezel width while maintaining manufacturing feasibility through standard multi-layer fabrication processes
Data Source
AI summary
A display device includes a display panel including an emission area and a non-emission area proximate to the emission area, and an input sensor disposed on the display panel. The input sensor includes a first sensor conductive layer disposed on the display panel, a first sensor insulation layer disposed on the first sensor conductive layer, and a second sensor conductive layer disposed on the first sensor insulation layer. The first sensor conductive layer and/or the second sensor conductive layer includes sides on which mesh openings overlapping the emission area are defined, wherein recesses are defined in the sides.