Curved Under-Display Digitizer Connections for Foldable Pen Input
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Solution Overview
Problem
Existing electronic devices lack efficient mechanisms for accurately sensing inputs from pens, particularly in applications requiring precise touch or pressure inputs, such as sketching or drawing, due to limitations in digitizer connectivity and alignment.
Innovation Solution
The electronic device incorporates a display panel with a first and second digitizer, connected by an anisotropic conductive film and a connecting circuit film, allowing for electrical connection through a connecting part with a curved shape, and includes bridge circuit films for enhanced input sensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single continuous digitizer is used across the entire display panel, then input sensing coverage is improved, but manufacturing complexity and alignment precision requirements increase
Solution Approach 1:
The digitizer is divided into multiple separate units (first digitizer and second digitizer) positioned at different locations on the display panel. Each digitizer unit can be manufactured and assembled independently, reducing overall system complexity while maintaining comprehensive input sensing coverage through coordinated operation of multiple units.
Solution Approach 2:
A connecting part with curved shape is introduced as an intermediary element to bridge the first and second digitizers. This connecting part includes a conductive film that enables electrical connection between the separate digitizer units, allowing them to function together as an integrated sensing system without requiring a single continuous digitizer structure.
2Adaptability or versatility
If digitizers are spaced apart in folding areas, then flexibility and foldability are improved, but electrical connection reliability deteriorates
Solution Approach 1:
The connecting part employs a thin conductive film structure that can flex and deform elastically. This flexible film maintains electrical connection between spaced-apart digitizers even when the display panel is folded, as the film can accommodate the mechanical deformation without breaking the electrical pathway.
Solution Approach 2:
The connecting part is designed with a curved shape rather than a straight configuration. This curvature provides mechanical compliance that allows the connecting structure to accommodate folding movements while maintaining electrical connectivity, as the curved geometry can better absorb and distribute mechanical stress during flexing.
3Ease of manufacture
If connecting parts have straight shapes, then manufacturing simplicity is improved, but alignment precision with digitizers deteriorates
Solution Approach 1:
The connecting part is designed with a curved shape that can better accommodate the geometric relationships between spaced-apart digitizers. This curved configuration provides more flexibility in alignment tolerance during assembly, as the curved geometry can adapt to slight variations in digitizer positioning while still achieving proper electrical connection.
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
This configuration enables precise and reliable pen input sensing, improving user interaction in applications like sketching or drawing by ensuring seamless digitizer connectivity and alignment, even in folding configurations.
Implementation Method 1
a connecting film including an anisotropic conductive film between the connecting part and the first digitizer for electrically connecting the first digitizer and the second digitizer
Data Source
AI summary
Disclosed is an electronic device including a display panel, a first digitizer under the display panel, a second digitizer under the display panel, electrically connected to the first digitizer, and including a main part spaced apart from the first digitizer in a first direction, and a connecting part extending from the main part toward the first digitizer to overlap the first digitizer, and a connecting circuit film under the first digitizer.