Rear Touch Layer Layout for Windable Displays Without Signal Loss
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Solution Overview
Problem
Existing windable and slidable display devices face challenges in maintaining touch functionality while ensuring the display area can be wound or slid without interference from protective cover plates, leading to reduced touch sensitivity and signal integrity.
Innovation Solution
A touch display device design featuring a flexible display panel with separate first and second display sections, a cover plate, and a first touch layer group positioned away from the second display section, allowing for touch sensing through the first touch layer group even in a wound state, with a gap between the touch layer group and the display section to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover plate is placed directly on the display section for protection, then the display area is protected, but the touch sensitivity and signal integrity are reduced due to interference
Solution Approach 1:
The display device is divided into separate functional zones: a first display section for visual output and a second display section with the first touch layer group for touch sensing. The cover plate is positioned to protect only the second display section, leaving the first display section exposed for optimal touch sensitivity and visual display quality.
Solution Approach 2:
The cover plate is positioned in a spatial arrangement where it covers the rear side of the second display section while maintaining a gap from the front display surface. This dimensional positioning allows the cover plate to provide protection without directly interfering with the touch sensing mechanism on the front surface.
2Device complexity
If the cover plate is positioned close to the display section for compact design, then the device structure is compact, but the capacitance and impedance changes affect signal quality
Solution Approach 1:
The cover plate is selectively positioned to cover only specific areas (the second display section) while leaving other areas (the first display section) exposed. This localized positioning provides protection where needed while maintaining signal quality in the touch sensing region by avoiding unnecessary capacitance interference.
3Device complexity
If the touch layer group is placed directly on the display section for integrated design, then the design is integrated, but the cover plate obstructs the display movement when wound or slid
Solution Approach 1:
The display panel is segmented into a first display section and a second display section with the touch layer group. This segmentation allows the first display section to move freely for winding and sliding operations while the second display section with the touch layer group remains protected by the cover plate, enabling both movement and touch functionality.
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
Maintains touch functionality and protects the display area by ensuring the cover plate does not obstruct the display's movement, while minimizing capacitance and impedance changes, thus preserving signal quality and touch sensitivity.
Implementation Method 1
a first touch layer group arranged on a side of the cover plate close to the second display section, wherein a gap is provided between the first touch layer group and the second display section
Data Source
AI summary
A touch display device and a method for controlling the same are provided. The touch display device includes a flexible display panel, a cover plate, and a first touch layer group. The flexible display panel includes a first display section and a second display section; the first display section and the second display section are arranged opposite to each other; the cover plate is provided on a side of the second display section away from the first display section; and the first touch layer group is provided on a side of the cover plate close to the second display section, and there is a gap between the first touch layer group and the second display section.