Touch Sensing Film Layout for UV-Protected Laser Etching
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Solution Overview
Problem
The existing touch display device manufacturing processes require complex and costly wet etching methods, which involve multiple photomasks and solvents, and there is a need for a method to prevent laser damage in single-side electrode structures without limiting laser pulse length and wavelength.
Innovation Solution
A touch display device is developed with a transparent cover, a patterned touch sensing film layer, a light-shielding layer, and a UV-blocking layer, where the UV-blocking layer is used to prevent ultraviolet light from damaging the light-shielding layer during laser etching, allowing for the replacement of wet etching with laser etching and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet etching process is used to form electrode circuit, then manufacturing precision can be achieved, but device complexity and manufacturing cost increase due to multiple photomasks and reaction solvents
Solution Approach 1:
The patent extracts and removes the light-shielding layer after laser etching the conductive material, eliminating the need for complex photomask processes while maintaining etching precision. This simplifies the manufacturing process by taking out the unnecessary light-shielding step.
Solution Approach 2:
The patent introduces a transparent blocking layer as an intermediary between the conductive material and the laser source. This layer mediates the laser etching process by allowing controlled energy transmission while protecting underlying layers, enabling precise patterning without complex photomasks.
2Reliability
If transparent blocking layer is added to protect conductive film during laser etching, then reliability improves, but device complexity increases
Solution Approach 1:
The transparent blocking layer serves multiple functions simultaneously: it protects the conductive material during laser etching, allows laser energy transmission for precise patterning, and maintains optical transparency for display applications. This multi-functionality reduces the need for additional protective layers.
Solution Approach 2:
The patent changes the optical parameters of the blocking layer by selecting materials with specific transparency characteristics that allow laser wavelengths to pass through while providing mechanical protection. This parameter optimization enables both protection and process simplicity.
3Productivity
If laser etching is used instead of wet etching, then manufacturing time is reduced and productivity increases, but harmful factors increase due to potential laser damage to light-shielding layer
Solution Approach 1:
The patent applies preliminary anti-action by positioning the light-shielding layer below the conductive material and using transparent blocking layers to prevent laser energy from reaching and damaging the light-shielding layer. This preemptive protection enables safe laser etching.
Solution Approach 2:
Transparent blocking layers act as intermediaries between the laser source and the light-shielding layer, absorbing or blocking harmful laser energy while allowing the etching process to proceed. This mediation protects underlying layers from damage.
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
The UV-blocking layer effectively prevents damage to the light-shielding layer during laser etching, reducing the need for solvents and simplifying the manufacturing steps, thereby reducing costs and improving the efficiency of the single-side electrode structure formation.
Implementation Method 1
The UV-blocking layer prevents ultraviolet light from irradiating the light-shielding layer
Implementation Method 2
the electrode circuit is patterned through a wet etching process
Data Source
AI summary
A touch display device is provided in some embodiments of the present disclosure, including a transparent cover, a patterned touch sensing film layer, a light-shielding layer, and a UV-blocking layer. The patterned touch sensing film layer covers a first surface of the transparent cover. The light-shielding layer is located between the transparent cover and the patterned touch sensing film layer. The UV-blocking layer prevents UV from irradiating the light-shielding layer. The UV-blocking layer is located between the light-shielding layer and the patterned touch sensing film layer and covers the light-shielding layer. A method of forming a touch display device is also provided. The touch display device and formation method thereof provided in some embodiments avoid the injury of the light-shielding layer caused by the laser by disposing of the UV-blocking layer in the single-side electrode structure, which replaces the wet etching steps and decreases the cost of the etching steps.