Flexible OLED Module Assembly to Prevent Substrate Cracking
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Solution Overview
Problem
The mechanical fastening of a flexible printed circuit board to a flexible organic light-emitting diode (OLED) creates mechanical stress on the protective glass substrate, risking cracks and compromising the protective function and aesthetic appearance.
Innovation Solution
The transparent substrate extends beyond the OLED, with the flexible printed circuit board fastened to the support via an adhesive, decoupling mechanical and electrical connections, and using an adhesive layer to secure the board without stressing the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit board is mechanically fastened to the glass substrate, then electrical connection is achieved, but mechanical stress causes cracking of the substrate
Solution Approach 1:
The patent divides the glass substrate into two functional zones: a first portion for mechanical support and shape definition, and a second portion for electrical interconnection. This segmentation allows the mechanical and electrical functions to be separated, preventing stress concentration at the connection point between the flexible printed circuit board and the substrate.
Solution Approach 2:
The patent introduces an adhesive layer as an intermediary between the flexible printed circuit board and the glass substrate. This adhesive mediates the connection by providing a compliant bonding surface that distributes mechanical stresses, preventing direct stress transmission to the glass substrate and avoiding crack formation.
2Reliability
If the flexible printed circuit board is fastened to the glass substrate, then electrical connection is established, but the protective function of the substrate is compromised
Solution Approach 1:
By segmenting the glass substrate into distinct functional portions, the patent ensures that the first portion maintains its integrity as a protective barrier. The separation of electrical connection functions to the second portion prevents stress-induced cracks that would compromise the protective function against moisture and dust.
Solution Approach 2:
The adhesive layer acts as an intermediary that protects the glass substrate from direct mechanical stress. This compliant bonding layer prevents stress concentration that could create cracks allowing moisture infiltration, thereby maintaining the protective function of the substrate.
3Reliability
If the flexible printed circuit board is fastened to the glass substrate, then electrical connection is achieved, but aesthetic appearance and light beam quality are impaired
Solution Approach 1:
The segmentation of the glass substrate allows the first portion to maintain its smooth, aesthetic surface quality for light emission, while the second portion handles electrical connections. This prevents stress-induced cracks and surface defects that would compromise aesthetic appearance and light beam quality.
Solution Approach 2:
The adhesive layer serves as an intermediary that prevents direct mechanical bonding between the flexible printed circuit board and the glass substrate. This eliminates stress concentration and surface cracking, preserving the aesthetic appearance and optical quality of the OLED display.
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
Minimizes the risk of substrate cracking and maintains the protective function while allowing flexible OLEDs to be shaped and electrically connected without mechanical stress.
Implementation Method 1
the flexible printed circuit board is fastened to this portion of the support by means of an adhesive
Implementation Method 2
an organic light-emitting diode which can be deformed without breaking, in particular by folding it or by bending it
Data Source
AI summary
The invention relates to a luminous module of a luminous and/or signaling device of an automotive vehicle. The luminous module includes a flexible OLED mounted on a transparent substrate with an electrical interconnection layer, a support of the flexible OLED, designed to shape at least part of the flexible OLED and the transparent substrate in a predetermined shape, the flexible OLED being fastened to the support by means of an adhesive, and a flexible printed circuit board. The transparent substrate includes a portion protruding beyond the OLED and facing a portion of the support, in that the flexible printed circuit board is electrically connected to the interconnection layer at this portion of the transparent substrate and in that the flexible printed circuit board is fastened to this portion of the support by means of an adhesive.