Touch Panel Electrode Lines with Cutaway Grooves to Reduce Moiré
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Solution Overview
Problem
Touch screen panels experience visibility issues due to the moiré phenomenon caused by the interference of unit electrode lines with diffusion films and TFT array panels, leading to defects in horizontal arrangements of inclined electrode lines.
Innovation Solution
The touch panel design incorporates unit electrode lines with cutaway grooves inclined in a direction symmetrical to boundary lines, and these grooves and boundary lines are disposed on the same axial line to reduce visibility and prevent the moiré phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If unit electrode lines are configured in a zigzag manner by alternately disposing inclined electrode lines to prevent moiré phenomenon, then the moiré phenomenon is prevented, but the repeatedly arranged portions in horizontal direction are recognized as line forms increasing visibility
Solution Approach 1:
The electrode lines are segmented by forming cutaway grooves that divide the continuous inclined lines into separate sections. This segmentation breaks the visual continuity of the repeatedly arranged portions, preventing them from being recognized as line forms while maintaining the zigzag configuration for moiré prevention
Solution Approach 2:
Material is extracted by forming cutaway grooves at specific portions of the electrode lines. These grooves remove conductive material to create visual breaks in the repeatedly arranged sections, reducing visibility without affecting the overall zigzag pattern's ability to prevent moiré phenomenon
2Ease of operation
If unit electrode lines are arranged in parallel in horizontal direction to recognize input signal position, then touch signal sensing is enabled, but linear patterns overlap with diffusion film and TFT array panel patterns causing moiré phenomenon
Solution Approach 1:
The electrode lines are configured with asymmetric zigzag patterns where alternate lines are inclined in opposite directions. This asymmetric arrangement prevents parallel alignment with the horizontal patterns of the diffusion film and TFT array panel, thereby eliminating the moiré phenomenon while maintaining touch signal sensing capability
Solution Approach 2:
The electrode lines transition from a one-dimensional horizontal arrangement to a two-dimensional zigzag configuration with vertical components. This dimensional change allows the lines to cross the horizontal patterns at angles, preventing overlapping alignment and moiré phenomenon while preserving the ability to sense touch signals across the display surface
Data Source
AI summary
A touch panel may include: a plurality of unit electrode lines disposed in a first axis direction and spaced apart from one another in a second axis direction perpendicular with respect to the first axis direction, wherein in each of a first side line and a second side line forming both sides of each of the unit electrode lines, a first side and a second side are alternately repeated, and a protrusion portion and a recess portion are alternately formed at contact portions at which the first and second sides contact each other depending on an angle at which the first and second sides contact each other, the recess portion being provided with a first groove formed by cutting the unit electrode line in a direction parallel to the first side, and a second groove formed by cutting the unit electrode line in a direction parallel to the second side.