Arcuate Electrode Shapes for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices with integrated touch sensors face challenges in minimizing parasitic capacitance and maintaining high aperture ratios, which affect the display's contrast and yield due to the rectangular shape of metal and sensor electrodes.
Innovation Solution
The use of metal and sensor electrodes with arcuate or polygonal shapes having more than four sides, positioned to reduce parasitic capacitance while maintaining predetermined distances, and the formation of insular-shaped electrodes to enhance the aperture ratio and reduce depolarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rectangular metal and sensor electrodes are used, then the electrode structure is simple and easy to manufacture, but parasitic capacitance increases and aperture ratio decreases
Solution Approach 1:
The patent applies curvature by replacing rectangular electrode shapes with arcuate (curved) shapes. The metal electrode and sensor electrode both feature arcuate configurations where the edges are rounded rather than sharp corners. This curvature reduces the concentration of electric field lines at corners, thereby reducing parasitic capacitance while maintaining ease of manufacturing through standard photolithography processes.
2Ease of manufacture
If rectangular metal and sensor electrodes are used, then the electrode structure is simple and easy to manufacture, but aperture ratio decreases
Solution Approach 1:
The arcuate shape of the electrodes allows for more efficient space utilization. By curving the electrodes rather than using rectangular shapes with fixed right angles, the design can optimize the spacing and positioning to maximize the light transmission area while minimizing the electrode area, thereby increasing the aperture ratio.
3Object-affected harmful factors
If metal and sensor electrodes are positioned closer to reduce parasitic capacitance, then display contrast improves, but the risk of electrical interference and manufacturing precision requirements increase
Solution Approach 1:
The patent introduces an insulating film as an intermediary layer between the metal electrode and the sensor electrode. This insulating film serves as a mediator that electrically isolates the two electrodes, preventing direct electrical interference while allowing them to be positioned in close proximity. This enables the reduction of parasitic capacitance and improvement of display contrast without excessively increasing manufacturing precision requirements.
4Area of stationary object
If insular-shaped electrodes are used, then aperture ratio increases and depolarization is reduced, but electrode connectivity and manufacturing complexity increase
Solution Approach 1:
The insular-shaped electrodes feature arcuate boundaries with curved edges rather than sharp corners. This curvature reduces depolarization effects at the electrode edges while maintaining a relatively simple overall structure that can be manufactured using standard processes. The insular shape (island-like configuration) allows for optimized positioning that increases aperture ratio without excessive complexity.
Data Source
AI summary
According to one embodiment, a semiconductor substrate including, a switching element, a first organic insulating film, first and second metal lines arranged in a first direction and extending in a second direction, and a metal electrode located between the first and second metal lines. The first organic insulating film includes first and second surfaces. The switching element is covered with the first surface. The first and second metal lines and the metal electrode are located on the second surface side. The first metal line includes a first portion extending in the second direction and a second portion having a width larger than a width of the first portion. The second portion includes arcuate first and second edge. The metal electrode has a polygonal shape having n corners or an elliptic shape where n is larger than four.