Touch Display Spacer Placement for Sensitivity
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Solution Overview
Problem
Conventional touch displays suffer from poor response sensitivity due to uneven distribution of spacers in the adhesive layer, leading to potential short circuits in capacitive displays and inconsistent contact between electrode layers in resistance displays, affecting measurement accuracy.
Innovation Solution
A touch display design featuring a display panel with first and second stripe electrodes oriented perpendicular to each other, with spacers evenly distributed between the panels to maintain a consistent spacing and prevent contact at electrode junctions, allowing for even deformation and improved sensitivity, and optionally incorporating a sealant and alignment marks for precise assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spacers are doped in the adhesive layer, then the electrode layers are separated to avoid short circuit, but the spacers are not evenly distributed leading to potential contact between electrode layers
Solution Approach 1:
The patent extracts the spacers from the adhesive layer and places them directly on the display panel at predetermined locations. This separation allows for precise positioning of spacers without relying on the viscous adhesive layer for distribution, thereby ensuring both short circuit prevention and uniform distribution.
Solution Approach 2:
The spacers are pre-positioned on the display panel before the adhesive layer is applied. This preliminary action ensures that spacers are evenly distributed at critical locations before the bonding process, preventing both short circuits and ensuring consistent spacing throughout the assembly.
2Reliability
If spacers are located at electrode layer junctions, then short circuit is prevented, but electrode layers cannot contact even under external force affecting measurement accuracy
Solution Approach 1:
The patent applies different spacer placement strategies to different locations: spacers are positioned at electrode layer junctions where separation is critical to prevent short circuits, while avoiding placement at touch sensing areas where electrode contact is necessary for accurate measurement. This localized differentiation resolves the contradiction between short circuit prevention and measurement accuracy.
3Ease of manufacture
If spacers are unevenly distributed, then manufacturing is simpler, but response sensitivity deteriorates due to inconsistent electrode contact
Solution Approach 1:
The patent segments the spacer placement into discrete, predetermined locations on the display panel rather than requiring uniform distribution throughout the entire adhesive layer. This segmentation approach simplifies manufacturing by allowing spacers to be placed at specific critical points while ensuring consistent spacing and maintaining response sensitivity through reliable electrode separation at junctions.
Data Source
AI summary
A touch display including a display panel, multiple first stripe electrodes, a substrate, multiple second stripe electrodes, and multiple spacers is provided. The display panel has a first surface, and the first stripe electrodes are disposed on the first surface. The substrate has a second surface, and the first surface faces the second surface. The second stripe electrodes are disposed on the second surface. A longitudinal direction of the first stripe electrodes is perpendicular to that of the second stripe electrodes. The spacers are disposed between the first surface of the display panel and the second surface of the substrate. Orthogonal projections of the spacers are on the display panel at locations where the first stripe electrodes are not disposed.