Touch Sensor Conductive Lines for Delta Subpixel Moiré
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Solution Overview
Problem
Existing approaches fail to effectively mitigate moiré patterns in display devices with a Delta arrangement of subpixels, as they are not capable of addressing the unique occlusion differences between odd and even rows of subpixels caused by the mesh pattern interaction.
Innovation Solution
A touch sensor design with a specific arrangement of conductive lines, where the first group of conductive lines extends obliquely by a first acute angle and the second group by a second acute angle, with offsets and pitches defined by specific mathematical relationships, to ensure equal occlusion of both odd and even rows of subpixels, thereby mitigating the moiré pattern effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional mesh pattern touch sensor is overlaid on a display with Delta arrangement of subpixels, then the touch sensor provides touch sensing functionality, but moiré pattern effects appear due to unequal occlusion of odd and even rows of subpixels
Solution Approach 1:
The patent applies asymmetry by designing the conductive line pattern with different configurations for odd and even rows. Specifically, the first conductive lines and second conductive lines have different orientations and positions, creating an asymmetric pattern that compensates for the asymmetric occlusion effects caused by the Delta arrangement of subpixels. This asymmetric design ensures that both odd and even rows experience equal occlusion, eliminating the moiré pattern effect while maintaining touch sensing functionality.
2Ease of manufacture
If conductive lines are arranged in a regular mesh pattern, then the touch sensor structure is simple and easy to manufacture, but the occlusion of light from subpixels becomes unequal across different rows
Solution Approach 1:
The patent applies local quality by making different parts of the conductive line pattern have different properties. The first conductive lines and second conductive lines are arranged with different orientations, positions, and spacings according to specific mathematical relationships involving the subpixel arrangement parameters. This local variation in conductive line characteristics ensures that each region of the display experiences appropriate occlusion, achieving uniform overall occlusion while maintaining manufacturability.
3Device complexity
If the touch sensor uses a standard conductive line arrangement, then the device complexity is low, but the color uniformity and visual clarity of the display are degraded due to moiré effects
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the conductive lines based on the specific parameters of the Delta arrangement of subpixels. The orientations, positions, and spacings of the conductive lines are calculated using mathematical relationships that incorporate the subpixel interval and arrangement characteristics. These parameter adjustments eliminate moiré effects and improve display visual clarity while keeping the overall device complexity manageable.
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 design efficiently reduces the visibility of moiré patterns by ensuring consistent occlusion of subpixels, improving the display's visual clarity and color uniformity.
Implementation Method 1
The superimposition of conductive lines, including opaque or semi-opaque materials for example, over the display elements can obstruct or occlude light from the pixels beneath the conductive lines.
Implementation Method 2
Optical interaction of mesh pattern touch sensors and optical display devices may result in appearance of one or more moiré-pattern effects.
Data Source
AI summary
Disclosed is a touch sensor, and a display device including the same. The touch sensor for a Delta arrangement of subpixels comprises a first group of conductive lines extending parallelly along an oblique direction with respect to the Delta arrangement of subpixels, the first group of conductive lines comprising first conductive lines and second conductive lines arranged alternately, the first conductive lines arranged at a same first pitch as the second conductive lines and deviated from the second conductive lines so as to homogenize the occlusions of the Delta arrangement of subpixels.