Digitizer Photosensitive Resin Surface Roughness and Shielding
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Solution Overview
Problem
Existing electronic apparatuses with digitizers face issues in maintaining improved visibility and appearance due to surface roughness and light interference from uneven digitizer surfaces, which affect user experience and reliability.
Innovation Solution
The electronic apparatus incorporates a digitizer with a photosensitive resin layer having a flat first surface and a rougher second surface, where the flat surface is adjacent to the display panel, and includes a shielding layer on the rougher surface, which can be coupled directly to the resin layer without an adhesive, to minimize light interference and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the digitizer uses a photosensitive resin layer with uniform surface roughness, then the manufacturing process is simpler, but the visibility and appearance are degraded due to light interference from uneven surfaces
Solution Approach 1:
The patent applies different surface roughness characteristics to different surfaces of the photosensitive resin layer. The first surface (facing the display panel) has a first roughness, while the second surface (opposite side) has a second roughness that is less than the first roughness. This local differentiation resolves the contradiction by optimizing each surface for its specific function: the first surface for sensing performance and the second surface for visual appearance.
2Reliability
If the digitizer surface is made rougher to improve sensing performance, then sensing capability is enhanced, but light interference increases and degrades visibility
Solution Approach 1:
The patent differentiates surface roughness between the two surfaces of the photosensitive resin layer. The first surface has higher roughness optimized for sensing coil interaction and electromagnetic signal detection, while the second surface has lower roughness to minimize light scattering and interference when viewed through the display panel, thus resolving the contradiction between sensing performance and visual quality.
Solution Approach 2:
The patent introduces a shielding layer as an intermediary component between the photosensitive resin layer and the display panel. This shielding layer, positioned on the second surface, serves as a mediator that blocks or reduces light interference reaching the user's eye, allowing the first surface to maintain higher roughness for sensing optimization without compromising visibility.
3Reliability
If an adhesive layer is added to attach the shielding layer to the digitizer, then the shielding effect is improved, but the device complexity and thickness increase
Solution Approach 1:
The patent merges the shielding layer with the photosensitive resin layer by directly forming the shielding layer on the second surface of the resin layer without introducing a separate adhesive layer. This integration reduces the overall structure complexity and minimizes the thickness of the digitizer assembly while maintaining effective shielding performance against light interference.
Solution Approach 2:
The photosensitive resin layer serves its own dual function of both structural support and adhesive bonding. The second surface of the resin layer directly supports the shielding layer through its own material properties, eliminating the need for a dedicated adhesive layer and thereby reducing device complexity and thickness.
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 reduces the visibility of uneven surfaces, improves the appearance and reliability of the electronic apparatus by minimizing light interference and allowing for a slim digitizer design, while maintaining effective sensing capabilities.
Implementation Method 1
a first photosensitive resin layer corresponding to the first surface of the digitizer, a first sensing coil disposed on the first photosensitive resin layer
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An electronic apparatus includes a window, a display panel disposed under the window, and a digitizer disposed under the display panel. The digitizer includes a photosensitive resin layer including a front surface and a rear surface opposite to the front surface, and a plurality of sensing coils disposed inside the photosensitive resin layer. The front surface is relatively flat compared with the rear surface.