Display Panel Middle Layer for Hiding Wiring During Film Bonding
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Solution Overview
Problem
Display devices face the challenge of making wiring patterns visible due to external light reflection, which affects the appearance and alignment of the display panel and protective film during manufacturing.
Innovation Solution
A display device design featuring a middle layer with a light-blocking area and a light-transmitting area is implemented, where the light-blocking area overlaps with the display area and the light-transmitting area overlaps with the pad area, using a light-blocking printed layer or adhesive layer to prevent external light from reflecting onto the wiring patterns, and ensuring proper alignment and bonding of the display panel and protective film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is disposed on the display panel, then the display panel is protected, but wiring patterns become visible due to external light reflection
Solution Approach 1:
A light-blocking adhesive layer is introduced as an intermediary between the protective film and the display panel. This adhesive layer contains a light-blocking layer that prevents external light from reflecting off the wiring patterns, thereby solving the visibility issue while maintaining the protective function of the protective film.
Solution Approach 2:
The light-blocking adhesive layer is applied selectively only in regions where wiring patterns are present and need to be hidden. The adhesive layer has different optical properties (light-blocking) in specific areas compared to other areas, allowing local suppression of light reflection without affecting the overall transparency or protection of the display panel.
2Manufacturing precision
If alignment marks are used for bonding the protective film and display panel, then bonding accuracy is improved, but the wiring patterns become visible during alignment
Solution Approach 1:
The light-blocking adhesive layer serves as a mediator that enables accurate alignment by providing visible alignment marks while simultaneously blocking light from reflecting off the wiring patterns. This allows the alignment process to be performed accurately without the aesthetic defect of visible wiring patterns.
Solution Approach 2:
The light-blocking adhesive layer contains pigments or materials that change the optical appearance of the bonding region. By absorbing or blocking light, it creates a contrasting appearance that makes alignment marks more visible while preventing the underlying wiring patterns from reflecting light and becoming visible.
3Shape
If a light-blocking layer is added to prevent wiring pattern visibility, then appearance quality is improved, but device complexity increases
Solution Approach 1:
The light-blocking function is merged with the adhesive layer that is already necessary for bonding the protective film to the display panel. By incorporating light-blocking materials into the adhesive layer, the patent achieves both bonding and light-blocking functions in a single component, thereby minimizing the increase in device complexity.
Solution Approach 2:
The adhesive layer is designed to perform multiple functions: it provides bonding between the protective film and display panel, enables alignment through visible marks, and blocks light to prevent wiring pattern visibility. This multi-functionality reduces the need for additional separate components and minimizes overall device complexity.
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
This solution effectively prevents wiring patterns from becoming visible due to external light, facilitating precise alignment and bonding of the display panel and protective film, thereby enhancing the manufacturing process and the appearance of the display device.
Implementation Method 1
the light-blocking area overlaps with the display area... the light-blocking area may include a light-blocking printed layer that is formed on the protective film
Implementation Method 2
an adhesive layer covering the light-blocking printed layer and the protective film... One surface of the adhesive layer is placed in contact with the impact absorbing layer and the other surface of the adhesive layer is placed in contact with the protective film
Data Source
AI summary
Display device and method of manufacturing the display device are provided. According to an exemplary embodiment of the present disclosure, a display device includes a display panel having a display area and a pad area, which is spaced apart from the display area; a protective film disposed on one surface of the display panel; and a middle layer interposed between the protective film and the display panel, wherein the middle layer has a light-blocking area and a light-transmitting area, the light-blocking area overlaps with the display area, and the light-transmitting area overlaps with the pad area.