Luminance Enhancement Structure Direct Lamination
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Solution Overview
Problem
Electrophoretic display devices suffer from reduced brightness due to total internal reflection, which is exacerbated by the presence of a substrate layer between the display device and the luminance enhancement structure, leading to inefficient light redirection.
Innovation Solution
The removal of the substrate layer and direct lamination of a luminance enhancement structure with an adhesive over the common electrode layer, reducing the thickness between the display device and the luminance enhancement structure to less than 2 microns, allowing for improved light redirection and enhanced brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a substrate layer (PET) is present between the display device and the luminance enhancement structure, then the structural integrity and ease of manufacture are improved, but the brightness and light redirection efficiency are reduced due to total internal reflection at the interface
Solution Approach 1:
The patent removes the substrate layer (PET) from between the display device and the luminance enhancement structure. This extraction eliminates the harmful optical interface that causes total internal reflection, thereby improving brightness and light redirection efficiency while maintaining structural integrity through alternative design approaches
2Illumination intensity
If the thickness of the PET substrate is reduced to improve brightness, then some light loss is reduced, but the structural support and protection are compromised
Solution Approach 1:
Instead of merely reducing substrate thickness, the patent completely removes the substrate layer. The structural support function is transferred to the display device encapsulation and the luminance enhancement structure itself, which is designed to provide both optical functionality and mechanical strength
3Illumination intensity
If the substrate layer is removed and the luminance enhancement structure is directly laminated to the common electrode layer, then brightness and light redirection efficiency are significantly improved, but the manufacturing complexity increases
Solution Approach 1:
The substrate layer is removed to eliminate optical losses
Solution Approach 2:
The luminance enhancement structure is directly laminated to the common electrode layer, merging previously separate components (substrate and enhancement structure) into a more integrated assembly, reducing the number of interfaces and simplifying the overall structure despite the removal of the substrate
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 approach significantly improves the performance of the luminance enhancement structure by eliminating the substrate layer, resulting in increased brightness and more efficient light redirection to the viewer.
Implementation Method 1
Total internal reflection inevitably would occur with an electrophoretic display device because such a display device usually has components of a high refractive index. Due to the components having a higher refractive index (e.g., about 1.5) than the air (which has a refractive index of about 1) surrounding the device, some of the scattering light from the display panel may reflect off the display front surface and back to the display device by total internal reflection.
Implementation Method 2
Due to the components having a higher refractive index (e.g., about 1.5) than the air (which has a refractive index of about 1) surrounding the device
Data Source
AI summary
The present invention is directed to a display device assembly which comprises a display device and a luminance enhancement structure. The luminance enhancement structure is directly laminated onto an ITO layer with an adhesive. The assembly of the present invention provides improved performance of the luminance enhancement structure.