Rectangle-Shaped Metal Wiring for Reducing Moiré in Touch Panels
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Solution Overview
Problem
Display devices with touch panel functions face issues of visible streaks of reflection and moiré patterns due to the visibility of metal wirings for Rx electrodes, particularly in large-sized panels, which affect the display quality.
Innovation Solution
The use of rectangle-shaped metal wirings configured with four lines that are contiguous in a first direction, where at least two lines are separated at cross-points, creating a pseudo-mesh structure to minimize visibility and reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If metal wirings are used for Rx electrodes to maintain necessary response speed, then response speed is improved, but visibility of streaks of reflection and moiré patterns occurs
Solution Approach 1:
The patent divides the continuous metal wiring into discontinuous segments by introducing gaps at regular intervals. This segmentation reduces the continuous reflective surface into discrete segments, thereby diminishing the visibility of streaks of reflection and moiré patterns while preserving the electrical connectivity and response speed of the Rx electrodes
Solution Approach 2:
The patent introduces a gap structure as an intermediary element between continuous metal wirings. These gaps act as mediators that interrupt the continuous reflective path, reducing the harmful visual effects of streaks and moiré patterns while maintaining the electrical function through the discontinuous metal segments
2Object-generated harmful factors
If transparent conductive oxide film (ITO) is used for Rx electrodes to make electrodes inconspicuous, then visibility is improved, but response speed becomes slow due to high electric resistance
Solution Approach 1:
The patent employs a composite structure combining transparent conductive oxide film (ITO) with metal materials. The ITO layer provides transparency to make electrodes inconspicuous, while the metal layer (such as aluminum or its alloys) provides low electrical resistance for fast response speed. This composite material approach resolves the contradiction between visibility and response speed by leveraging the complementary properties of both materials
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 configuration reduces the visibility of streaks of reflection and moiré patterns, enhancing the overall display quality by maintaining necessary response speed while minimizing brightness variations across the screen.
Implementation Method 1
it tends to reflect the external light as depicted in FIG. 16. In FIG. 16, IL is external light and RL is reflected light.
Implementation Method 2
If those touch panels are electrostatic capacitance type, both types need Tx (transmitter) electrodes, which are driving electrodes, and Rx (receiver) electrodes, which are detecting electrodes.
Data Source
AI summary
The purpose is to realize the display device installed with touch panel having less moire. A display device having metal wirings on a display screen comprising: the metal wirings include; first and second metal wirings extending in a first direction and arranged in a second direction, the first metal wiring has a first line, which has a first angle to the first direction, and a second line, which has a second angle to the first direction, the second metal wiring has a third line and fourth line, which are configured as the same manner as the first metal wiring, the first metal wiring and the second metal wiring are arranged so that the first to fourth lines form rectangle, wherein, at a cross point of the first to fourth lines, the first line and the second line are connected and the third line and the fourth line are separated.