Display Panel Ambient Light Blocking via Segmented Polarizer
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Solution Overview
Problem
Display panels face challenges in improving display quality due to ambient light reflection, which can be addressed by enhancing light emitting efficiency or using circular polarizers, but these solutions increase thickness and reworking costs.
Innovation Solution
A display panel configuration incorporating a first substrate, a second substrate, a quarter wavelength phase retarder, and a linear polarizer, where the quarter wavelength phase retarder is disposed between the substrates or integrated with one substrate, and the linear polarizer is positioned opposite to the phase retarder, effectively blocking ambient light while reducing overall thickness and adhesion reworking costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is disposed above the display panel to block ambient light, then the ambient light reflection is blocked, but the total thickness of the display panel is increased
Solution Approach 1:
The circular polarizer is segmented into two separate components: a quarter wavelength phase retarder and a linear polarizer. The quarter wavelength phase retarder is disposed between the first substrate and second substrate, while the linear polarizer is disposed at the outer side of the second substrate. This segmentation allows each component to perform its specific function independently, achieving the same ambient light blocking effect as a circular polarizer while reducing the overall thickness requirement.
Solution Approach 2:
The quarter wavelength phase retarder acts as an intermediary component that transforms the polarization state of light between the linear polarizer and the display panel. By introducing this intermediary element, the system can achieve circular polarization filtering functionality through a combination of linear polarization and phase retardation, thereby reducing the thickness compared to using a single circular polarizer.
2Reliability
If the circular polarizer is defectively adhered to the display panel, then reworking of adhesion is required, but this results in huge cost
Solution Approach 1:
By segmenting the circular polarizer into separate components (quarter wavelength phase retarder and linear polarizer), the patent reduces the risk of defective adhesion. If adhesion issues occur, only the linear polarizer needs to be reworked, not the entire circular polarizer assembly. This segmentation isolates the adhesion critical path to a smaller, more manageable component.
Solution Approach 2:
The linear polarizer, being a simpler and potentially less expensive component compared to a full circular polarizer, can be more easily replaced if adhesion fails. The quarter wavelength phase retarder integrated between substrates provides stable structural support, allowing the linear polarizer to be the sacrificial element that can be reworked or replaced at lower cost.
3Illumination intensity
If light emitting efficiency is enhanced to improve display quality, then the display quality is improved, but the power consuming is increased
Solution Approach 1:
The patent converts the harmful effect of ambient light reflection into a beneficial filtering mechanism. By using the quarter wavelength phase retarder and linear polarizer combination, ambient light is systematically blocked through polarization filtering rather than requiring increased light emitting intensity. This approach improves display quality by eliminating reflections without the penalty of increased power consumption.
Solution Approach 2:
The quarter wavelength phase retarder serves as an intermediary that enables efficient light filtering by transforming the polarization state. This intermediary mechanism allows the linear polarizer to effectively block ambient light while minimizing the need for increased light emitting intensity, thereby maintaining display quality without proportionally increasing power consumption.
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 configuration effectively blocks ambient light, reduces the total thickness of the display panel, and lowers the reworking costs associated with adhesion, resulting in a slimmer and more cost-effective display solution.
Implementation Method 1
The quarter wavelength phase retarder is disposed between the first substrate and the second substrate... The quarter wavelength phase retarder has birefringence property
Implementation Method 2
The linear polarizer is disposed at a side of the second substrate opposite to the quarter wavelength phase retarder... effectively blocking ambient light
Data Source
AI summary
A display panel includes a first substrate, a second substrate, a quarter wavelength phase retarder, and a linear polarizer. The first substrate has a light emitting element disposed on the first substrate. The opposite panel is disposed opposite to the first substrate. The quarter wavelength phase retarder is disposed between the first substrate and the second substrate. The linear polarize is disposed at a side of the second substrate opposite to the quarter wavelength phase retarder.