Optical Layer Stack for Wide-Angle Display Light Control
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Solution Overview
Problem
The challenge in improving the utilization efficiency of light in panoramic head-up displays (PHUDs) is due to the difference in reflectance between P-polarized waves and S-polarized waves at relatively large angles, leading to issues such as ghosting and glare from stray light.
Innovation Solution
A display device with a stacked structure comprising a light collection layer, a light adjustment layer, and a color filter layer, which adjusts the emission angle and polarization state of light to enhance light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light is projected onto a windshield at relatively large angles for panoramic display, then the display coverage area is improved, but the reflectance difference between P-waves and S-waves causes ghosting and glare from stray light
Solution Approach 1:
The patent segments the optical path by introducing a beam splitting mirror that divides the light from the display screen into different paths. This allows the display image to be projected onto the windshield at controlled angles while separating the direct light path from reflected light, thereby reducing ghosting and glare effects while maintaining panoramic display coverage.
Solution Approach 2:
The patent introduces a beam splitting mirror as an intermediary component between the display screen and the windshield. This mediator component controls the light reflection and transmission, enabling the system to achieve wide-angle panoramic display while managing the polarization-related stray light issues through precise optical path management.
2Adaptability or versatility
If the emission angle of light is increased to achieve panoramic display, then the display field of view is improved, but the utilization efficiency of light decreases due to polarization effects
Solution Approach 1:
The patent employs a beam splitting mirror that dynamically manages light paths based on the display requirements. By adjusting the optical configuration, the system can adaptively control the emission angles and polarization states, maintaining high light utilization efficiency while achieving panoramic field of view through flexible optical path management.
Solution Approach 2:
The patent changes the optical parameters by introducing a beam splitting mirror that modifies the light emission angles and polarization states. This parameter adjustment allows the system to optimize light utilization efficiency while maintaining the desired panoramic display field of view, resolving the contradiction between wide-angle display and light efficiency.
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 mitigates ghosting and glare by optimizing light emission, thereby improving the overall utilization efficiency and display quality.
Implementation Method 1
the light collection layer is disposed on the light-emitting units and includes a plurality of penetrating portions and a plurality of reflecting portions disposed around the penetrating portions
Implementation Method 2
the light adjustment layer may adjust an emission angle and/or a polarization state of light
Data Source
Figure 1A~1B
Figure 2A
Figure 2B~2C
AI summary
The display device provided in the disclosure includes a circuit substrate, a plurality of light-emitting units, a light collection layer, a light adjustment layer, and a color filter layer. The light-emitting units are disposed on the circuit substrate. The light collection layer is disposed on the light-emitting units and includes a plurality of penetrating portions and a plurality of reflecting portions disposed around the penetrating portions. The penetrating portions respectively overlap with the light-emitting units. The light adjustment layer is disposed on the light collection layer. The color filter layer is disposed on the light adjustment layer and includes a plurality of color filter units respectively overlapping with the penetrating portions.