Flat Panel Display Adhesive Layer Refractive Index Matching
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Solution Overview
Problem
Conventional flat panel display devices suffer from image distortion due to insufficient attachment between the display panel and the protection board, caused by empty spaces and refractive index differences, as well as surface step differences and bubble formation during adhesion.
Innovation Solution
A flat panel display device with an adhesive layer having a refractive index between the display panel's upper substrate and protection board, applied between the display panel and protection board, along with a bezel to prevent external impact, and a method involving pressure application to ensure close attachment and prevent bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display panel and protection board are attached along edges only, then the structure is simple and easy to manufacture, but empty spaces remain between the panels causing image distortion
Solution Approach 1:
The adhesive application is segmented into multiple regions: a first adhesive applied along the edges for primary attachment, and a second adhesive applied in the central region to fill empty spaces. This segmentation allows the attachment process to address both edge alignment and central gap filling separately, achieving complete coverage without compromising manufacturing simplicity
Solution Approach 2:
The first adhesive is applied along the edges before the panels are fully assembled, establishing initial attachment points that hold the panels in position. This preliminary action prevents displacement during subsequent steps and ensures that the central region remains accessible for the second adhesive application
2Manufacturing precision
If a black matrix is added to the display panel, then the image quality improves, but surface step differences cause bubbles during adhesion
Solution Approach 1:
The adhesive application strategy is differentiated by location: the first adhesive concentration is applied at the edges where the black matrix creates step differences, while the second adhesive is applied in the central region. This local differentiation allows the adhesive to flow into and fill the step differences caused by the black matrix, preventing bubble formation while maintaining image quality
Solution Approach 2:
The adhesive layer acts as an intermediary substance that compensates for the surface step differences created by the black matrix. By applying adhesive in two stages, the system mediates between the uneven surface topology and the requirement for smooth, bubble-free adhesion, allowing the black matrix to remain for image quality while eliminating its harmful effect of causing bubbles
3Illumination intensity
If the protection board is made of transparent glass, then the brightness is maintained, but the refractive index difference causes image distortion
Solution Approach 1:
The adhesive layer serves as an optical intermediary between the display panel and the transparent glass protection board. By selecting an adhesive with a refractive index that matches or bridges the gap between the panel and glass refractive indices, the adhesive minimizes refraction and reflection at the interfaces, thereby reducing image distortion while preserving the brightness benefits of the transparent protection board
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 ensures a closer attachment of the display panel to the protection board, minimizing empty spaces and refractive index-induced distortions, while maintaining image quality and preventing external damage, by using an adhesive layer with a specific refractive index and applying controlled pressure.
Implementation Method 1
the adhesive layer has a refractive index between a refractive index of the upper substrate and a refractive index of the protection board
Data Source
AI summary
Provided are a flat panel display device including a protection board configured to prevent damage of a display panel from external impact, and a method of fabricating the same. The display panel and the protection board are closely attached, and distortion of an image displayed on the display panel due to a space between the display panel and the protection board can be prevented. The flat panel display device includes a display panel including a lower substrate, an upper substrate and at least one light emitting element disposed between the lower and upper substrates, a protection board disposed on the display panel, and an adhesive layer disposed between the display panel and the protection board. The method includes preparing a display panel including a lower substrate, an upper substrate and at least one light emitting element disposed between the lower and upper substrates, preparing a protection board, forming an adhesive layer on one surface of the display panel or the protection board, arranging the display panel and the protection board such that the adhesive layer is disposed between the display panel and the protection board, and applying a predetermined pressure to attach the display panel to the protection board.