Touch Display Panel Structure for Flat Surface and Light Sensing
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Solution Overview
Problem
Conventional in-cell type touch display panels face issues with uneven user contact surfaces due to the arrangement of polarizers and light sensor modules, leading to poor touch feeling and space constraints in full-screen displays.
Innovation Solution
A non-polarized window is formed in the polarizer, filled with an optical clear material, and a thin cover plate is attached to create a flat, smooth user interface, using materials like ultra-thin glass and optical clear adhesive to enhance touch sensitivity and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is formed in the top polarizer to allow external light entry for light sensor modules, then light sensor functionality is enabled, but the outer surface of the touch display panel becomes uneven
Solution Approach 1:
A cover plate is introduced as an intermediary component between the user's finger and the non-uniform surface created by the polarizer gap. The cover plate provides a flat contact surface that masks the underlying structural irregularity, allowing both light sensor functionality and smooth touch surface to coexist
Solution Approach 2:
The solution moves the flatness issue from the 2D polarizer layer to a 3D structure by adding a cover plate that extends beyond the display area. This allows the contact surface to be flat in the user interaction dimension while the polarizer gap remains functional in the optical dimension
2Ease of manufacture
If the top polarizer is made of plastic material to maintain flexibility, then manufacturing is easier, but the user's touch feeling deteriorates
Solution Approach 1:
The system uses a composite structure where the polarizer can be made of plastic material for ease of manufacture, while the cover plate provides the smooth tactile surface for good touch feeling. This composite approach allows each component to optimize for its primary function
3Area of stationary object
If the frame region is reduced for full-screen display to improve display area, then display quality improves, but space for sensor modules becomes insufficient
Solution Approach 1:
The light sensor modules are relocated from the frame region to the non-display area outside the edge of the display area. The cover plate extends beyond the display boundary to provide a flat contact surface over this region, enabling sensor placement without compromising display area
Data Source
AI summary
A touch display panel includes an embedded touch liquid crystal display (LCD) module, a polarizer, and a cover plate. The embedded touch LCD module includes a non-filter window. The polarizer is disposed over the embedded touch LCD module and has a non-polarized window, a first vertical projection of the non-polarized window overlaps with a second vertical projection of the non-filter window, and the non-polarized window is filled with an optical clear material. The cover plate overlays the polarizer, and the optical clear material in the non-polarized window contacts the cover plate. The disclosure also provides a method for manufacturing the touch display panel and a display device including the touch display panel.