Touch Panel Printing Layers Inversion for Lamination Precision

Solution Overview

Problem

The existing lamination process of touch panels with cover glass in handheld electronic devices faces challenges in controlling yield due to height differences between printing layers, leading to precision issues and damage to the frame pattern caused by ink accumulation.

Innovation Solution

The method involves seriatim stack-printing multiple printing layers on a protective substrate in ascending order of size, reducing the height difference between layers and improving the lamination process's precision and optical density of the frame pattern.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If multiple printing layers are stack-printed in descending order of size, then the frame pattern design can be achieved, but the height difference between printing layers increases and lamination precision deteriorates

Engineering Contradiction:

Improvelamination precisionVSAvoidheight difference between printing layers

Core Design Contradiction:

Manufacturing precisionVSShape

Solution Approach 1:

The patent applies inversion by reversing the traditional printing sequence from descending order of size to ascending order of size. Instead of printing the largest frame pattern first and progressively adding smaller layers, the method prints the smallest frame pattern first and progressively adds larger layers on top. This inverted approach ensures that each subsequent printing layer has a larger area than the previous one, preventing ink accumulation at layer junctions and reducing height differences, thereby improving lamination precision.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If multiple printing layers are stack-printed, then the color O.D value of frame pattern can be improved, but ink accumulation occurs at layer junctions and damages the frame pattern

Engineering Contradiction:

Improveframe pattern qualityVSAvoidink accumulation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies inversion by reversing the traditional printing sequence from descending order of size to ascending order of size. Instead of printing the largest frame pattern first and progressively adding smaller layers, the method prints the smallest frame pattern first and progressively adds larger layers on top. This inverted approach ensures that each subsequent printing layer has a larger area than the previous one, preventing ink accumulation at layer junctions and reducing height differences, thereby improving lamination precision.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If the number of printing layers is increased, then the color O.D value of frame pattern is improved, but the difficulty of controlling lamination process increases

Engineering Contradiction:

Improvecolor O.D valueVSAvoidlamination process control difficulty

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies inversion by reversing the traditional printing sequence from descending order of size to ascending order of size. Instead of printing the largest frame pattern first and progressively adding smaller layers, the method prints the smallest frame pattern first and progressively adds larger layers on top. This inverted approach ensures that each subsequent printing layer has a larger area than the previous one, preventing ink accumulation at layer junctions and reducing height differences, thereby improving lamination precision.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS9492994B2Device having multiple printing layers and a printing method thereof

Publication Date: 2016.11.15 TRENDON TOUCH TECHNOLOGY CORPORATION

AI summary

The present disclosure discloses a device having multiple printing layers and a printing method thereof, wherein said method comprises: seriatim stack-printing at least one printing layer on a protective substrate in an ascending order of size, wherein the protective substrate has an open surface exposed outward and a laminating surface laminated with a plate, and wherein the printing layer is printed on a part of the laminating surface and the closer the printing layer is to the laminating surface, the smaller area the printing layer has so as to reduce height difference between printing layers and make for the following lamination.