Microstructure Ink Transfer Coating for HUD Glare Shielding
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Solution Overview
Problem
In-vehicle head-up displays suffer from glare caused by sunlight, which poses a safety threat to drivers, and existing solutions have not effectively addressed this issue.
Innovation Solution
An ink coating method is applied to microstructures in optical elements, using a transfer head with separated transfer surfaces to uniformly coat light shielding surfaces while maintaining light transparency on alternate surfaces, and a debonding adhesive is used to expose light transparent surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If microstructure design is used to control light path for anti-glare effect, then glare is reduced, but manufacturing precision and coating uniformity become difficult to achieve
Solution Approach 1:
The transfer head is divided into multiple transfer structures, each with its own transfer surface. Each transfer structure independently transfers ink to corresponding microstructures on the optical element, enabling precise and uniform coating on each light shielding surface while maintaining the overall anti-glare effect.
Solution Approach 2:
A transfer head with transfer surfaces acts as an intermediary between the ink source and the microstructures on the optical element. The transfer head picks up ink from ink areas and transfers it to the light shielding surfaces, ensuring uniform coating while protecting the light transparent surfaces from ink contamination.
2Object-affected harmful factors
If ink is coated on all surfaces of microstructures, then light shielding is improved, but light transparency on alternate surfaces is lost
Solution Approach 1:
Different surfaces of the microstructures are treated differently: light shielding surfaces receive ink coating to block glare, while light transparent surfaces remain uncoated to maintain transparency. The transfer head's transfer surfaces are positioned to deposit ink only on light shielding surfaces, creating local quality differences that satisfy both requirements.
3Manufacturing precision
If transfer surfaces are positioned at the same pitch as light shielding surfaces, then coating precision is improved, but the transfer head cannot accommodate both light shielding and light transparent surfaces
Solution Approach 1:
The transfer head's transfer surfaces are arranged at a different pitch (second pitch) than the light shielding surfaces (first pitch) on the optical element. By changing the dimensional arrangement from a 1:1 correspondence to a differentiated pitch relationship, the transfer head can accommodate both light shielding surfaces and light transparent surfaces while maintaining coating precision through the transfer mechanism.
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 method effectively reduces glare by uniformly coating light shielding surfaces with ink, ensuring light transparency on alternate surfaces, thereby enhancing driver safety in vehicle displays.
Implementation Method 1
imprinting the optical element with the transfer head such that the ink on the transfer surfaces is coated onto the light shielding surfaces
Implementation Method 2
removing the debonding adhesive to expose the light transparent surfaces
Data Source
AI summary
An ink coating method is disclosed which can be applied to a plurality of microstructures of an optical element. The microstructures respectively have a plurality of light shielding surfaces located on the same side of the microstructures and the light shielding surfaces are separated from one another. This ink coating method includes: providing a transfer head, in which the transfer head includes a plurality of transfer structures, and the transfer structures respectively include transfer surfaces located on the same side of the transfer structures and the transfer surfaces are separated from one another; applying ink to the transfer surfaces; and using the transfer head to imprint the optical element, such that the ink on the transfer surfaces is coated onto the light shielding surfaces.