Display Panel Input Sensor Layout for Stylus Charging and Touch Detection
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Solution Overview
Problem
Existing display devices with integrated input sensors face challenges in efficiently detecting user inputs from both stylus pens and body parts, particularly in terms of sensitivity and accuracy, while also maintaining a compact and foldable design.
Innovation Solution
The display device incorporates a display panel with a base layer comprising multiple resin layers, where a charge electrode is disposed below one of the resin layers to charge stylus pens, and a sensing electrode is used to detect electromagnetically induced currents, allowing for dual-mode input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charge electrode is disposed below the resin layers, then the stylus pen charging function is integrated into the display panel, but the detection sensitivity and accuracy for body part inputs may be reduced
Solution Approach 1:
The sensing electrode is divided into multiple independent channels (first sensing electrode channel and second sensing electrode channel) that can independently detect different types of inputs. This segmentation allows each channel to be optimized for specific detection purposes, maintaining high sensitivity for body part inputs while accommodating the integrated charge electrode structure for stylus detection.
Solution Approach 2:
The sensing electrode structure is designed to perform multiple functions: it detects both stylus pen inputs (through electromagnetic induction when the stylus is near) and body part inputs (through capacitive coupling when a finger touches the surface). This multi-functionality resolves the contradiction by enabling dual-mode input detection without sacrificing detection accuracy for either mode.
2Measurement precision
If multiple sensing electrode channels are integrated into the display panel, then input detection capability is enhanced, but the device structure becomes more complex
Solution Approach 1:
The sensing electrode channels are merged with the display panel structure itself, using the same resin layers and substrate. The first and second sensing electrode channels are integrated into the existing display panel architecture rather than being added as separate components, which enhances detection capability while minimizing structural complexity.
Solution Approach 2:
The sensing electrode channels serve dual purposes: they function as both display panel structural elements and as input detection sensors. This multi-functionality allows the same structure to provide both display and sensing functions, reducing overall device complexity while maintaining high detection accuracy.
3Adaptability or versatility
If the display panel includes multiple resin layers with the charge electrode embedded, then the stylus charging function is internalized, but the manufacturing process becomes more complex
Solution Approach 1:
The charge electrode is embedded within the resin layers during the initial display panel manufacturing process, before final assembly. This preliminary integration allows the charge electrode to be formed simultaneously with other display panel components using standard fabrication techniques, avoiding the need for separate post-assembly steps and simplifying the overall manufacturing process.
Solution Approach 2:
The manufacturing processes for the display panel and the stylus charging function are merged into a single integrated fabrication sequence. The resin layers and charge electrode are formed together in the same manufacturing run, combining multiple functions into one manufacturing process and reducing production complexity.
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 enhances the sensitivity and accuracy of input detection, increases the number of sensing electrode channels, and internalizes the stylus pen charging and detection structures, resulting in improved performance and increased folding characteristics of the electronic device.
Implementation Method 1
The input sensor may also detect inputs from a stylus pen through electromagnetic induction
Implementation Method 2
a sensing electrode detecting an electromagnetically induced current
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A display device includes a display panel including a display region and a non-display region proximate to the display region. An input sensor is disposed on the display panel and includes a sensing electrode configured to detect an electromagnetically induced current. The display panel includes a base layer including a plurality of resin layers, a plurality of pixels disposed on the base layer and overlapping the display region, and a charge electrode disposed below at least one of the plurality of resin layers and overlapping the display region.