Touch Panel White Window Frame Printing Process
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Solution Overview
Problem
Conventional touch panel production methods are cumbersome, costly, and prone to yellowing issues when using white photosensitive materials, leading to low process yield and poor appearance, especially when preparing white window frame touch panels.
Innovation Solution
A touch panel design incorporating a BM frame layer made of photosensitive material with high insulation resistance, used in conjunction with ITO and metal wiring layers, where the BM frame layer shields metal traces and ITO layers, allowing for a step-like lapping structure and printing process to avoid high-temperature heating, thereby preventing yellowing and simplifying production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If yellow light photolithography is used to prepare the window frame layer, then the window frame pattern can be obtained, but the process becomes cumbersome and costly with low yield
Solution Approach 1:
The patent extracts the window frame preparation from the conventional yellow light photolithography process and replaces it with a printing process. This separation allows the window frame to be prepared independently using a simpler, more efficient method that doesn't require the complex multi-step photolithography sequence, thereby improving productivity while maintaining pattern precision.
Solution Approach 2:
The patent substitutes the mechanical/chemical photolithography system with a printing system. Instead of using photoresist coating, exposure, development, and etching processes, the window frame is directly printed onto the substrate and then baked. This replacement dramatically simplifies the process, reduces costs, and improves yield while achieving the same functional result.
2Shape
If white photosensitive material is used for window frame, then white window frame touch panel can be prepared, but yellowing occurs leading to poor appearance
Solution Approach 1:
The patent replaces the photosensitive material system with a printable material system. By using printing technology instead of photolithography, the window frame material is not exposed to the high-energy UV light that causes yellowing. The printed white material maintains its color stability because it undergoes only a low-temperature baking process rather than high-energy exposure, thereby eliminating the yellowing problem while achieving the desired white appearance.
Solution Approach 2:
The patent changes the processing parameters from high-energy UV exposure to low-temperature baking. This parameter change fundamentally alters how the white material is cured or set, avoiding the photochemical reactions that cause yellowing while still achieving the desired adhesion and color properties through controlled thermal processing.
3Reliability
If conventional ITO and metal trace processes are used, then conductivity is achieved, but high-temperature heating causes yellowing of white materials
Solution Approach 1:
The patent segments the processing sequence by preparing the window frame layer first through printing and low-temperature baking, before proceeding with the ITO and metal trace deposition. This segmentation allows the white material to be set at low temperature first, protecting it from subsequent high-temperature processes, while still achieving the required conductive properties through the standard ITO and metal trace layers deposited afterward.
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 solution enhances production efficiency, reduces costs, and improves the appearance of touch panels by preventing yellowing, while maintaining high yield and reducing environmental pollution compared to traditional yellow light photolithography methods.
Implementation Method 1
a BM frame layer (1) is first prepared by using a piece of clear glass as a substrate and a photosensitive material having a viscosity of 2-8 CPS and an insulation resistance≥1012Ω as a raw material
Implementation Method 2
a designated ITO1 (ITO Bridge) layer is obtained through a ITO1 processing, wherein the ITO1 layer mainly serves to have the transmitting or receiving shafts of the ITO2 connected and conductive
Data Source
AI summary
A touch panel and a preparation method therefor, which relate to the technical field of electronic device preparation. The method for preparing a touch panel comprises: firstly, preparing a BM frame layer (1), and then sequentially preparing an ITO1 layer (2), an OC1 layer (3) and an ITO2 layer (4a, 4b) in the BM frame layer (1); then, preparing a window frame layer (5) outside the BM frame layer (1) by means of a printing process; and finally, preparing a designated metal wiring layer (6a, 6b) and an OC2 layer (7). The touch panel and the preparation method therefor solve the problem that a white window frame in the current industry is yellowed easily. Compared with a yellow light lithography for preparing the window frame, the printing process for preparing the window frame is simpler in production process, higher in defect-free rate and lower in corresponding cost, and can reduce pollution from discharge of wastewater and waste gas generated by the chemical solution to the environment.