Metal Wiring with Resin Low Reflection Layer for Display
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Solution Overview
Problem
In liquid crystal display devices with in-cell touch panels, the high resistance of ITO film-based detection electrodes limits detection performance as the display size and resolution increase, and the use of metal layers results in high reflectance, degrading image contrast.
Innovation Solution
A manufacturing method involving a metal layer with a low reflection layer formed from a resin, which reduces resistance and reflectance, allowing for improved detection performance and image contrast by covering the metal layer with a resin layer that can be visually inspected and processed independently of the low reflection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ITO film is used for detection electrodes, then transmittance is maintained, but resistance becomes too high for large high-resolution displays
Solution Approach 1:
The patent uses a composite structure combining metal layer and low reflection layer to achieve both low resistance and high transmittance. The metal layer provides excellent electrical conductivity while the low reflection layer maintains optical properties, creating a composite material solution that overcomes the limitations of pure ITO film.
Solution Approach 2:
The patent changes the material parameters by transitioning from ITO film to a metal-based wiring layer with controlled thickness and composition. By adjusting the metal layer thickness to 50nm or less and using specific metal compositions, the resistance is reduced to enable large high-resolution display operation.
2Reliability
If metal layer is used to reduce resistance, then detection performance improves, but reflectance increases degrading image contrast
Solution Approach 1:
The patent employs a composite structure of metal layer and low reflection layer where the metal provides low resistance while the low reflection layer suppresses unwanted reflections. This composite approach allows the metal layer to be used at optimal thickness for conductivity without suffering from excessive reflectance.
Solution Approach 2:
The low reflection layer acts as an intermediary between the metal layer and the external environment, mediating the optical interaction by reducing reflectance while allowing the metal layer to maintain its electrical function. This intermediary layer solves the reflectance problem without compromising the low-resistance benefit.
3Reliability
If metal layer is formed and patterned, then low resistance is achieved, but processing complexity increases
Solution Approach 1:
The patent merges the formation of the metal layer and low reflection layer into an integrated process sequence where the metal film is formed first, then patterned, and subsequently covered with the low reflection layer. This combining of steps streamlines manufacturing compared to treating them as separate complex processes.
Solution Approach 2:
The patent performs preliminary formation of the metal film before patterning, establishing the conductive base layer first. This preliminary action allows subsequent patterning and low reflection layer formation to proceed more efficiently, reducing overall processing complexity.
Data Source
AI summary
A manufacture method for display device includes the steps of: (a) forming a metal film on a substrate; (b) forming a metal layer by patterning the metal film; and (c) following the step (b) and forming, on the metal layer, a low reflection layer of a resin. The step (b) includes the steps of: (b1) forming an etching protection film; (b2) patterning the etching protection film; and (b3) following the step (b2) and etching the metal film.