Cross Dichroic Prism Display Device Brightness Optimization
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Solution Overview
Problem
Existing display devices for virtual image observation lack an effective optical system to guide image light to the user's pupils, leading to potential brightness deterioration.
Innovation Solution
A display device comprising a first and second self-light-emitting panel with different wavelengths, a cross dichroic prism to combine image light, polarizing plates, and a light-guiding optical system with a polarizing mirror, where the polarizing axes are aligned relative to the intersecting axis of the cross dichroic prism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional optical system is used to guide image light to user pupils, then the device structure is simple, but brightness deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the orientation of polarizing axes relative to the intersecting axis of the cross dichroic prism. By setting specific angular relationships (parallel or perpendicular orientations), the system optimizes light transmission characteristics and prevents brightness deterioration while maintaining a manageable optical system structure.
Solution Approach 2:
The patent employs composite optical components including a cross dichroic prism combining multiple dichroic mirrors, polarizing plates with specific axis orientations, and a polarizing mirror. This composite structure integrates multiple optical functions (wavelength separation, polarization control, light deflection) into a unified system that achieves high brightness without excessive complexity.
2Illumination intensity
If polarizing axes are not aligned with the intersecting axis of the cross dichroic prism, then device complexity is reduced, but brightness deteriorates
Solution Approach 1:
The patent establishes specific parameter relationships between the polarizing axes and the intersecting axis of the cross dichroic prism. By defining that polarizing axes should be parallel or perpendicular to the intersecting axis, the system achieves optimal brightness while providing clear design guidelines that simplify the alignment process rather than increasing 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
The solution ensures that the combined image light is deflected uniformly, preventing brightness reduction and enabling the observation of a bright virtual image.
Implementation Method 1
a cross dichroic prism configured to cause first image light and second image light to exit as combined light from an exit surface
Implementation Method 2
a light-guiding optical system including a polarizing mirror and configured to deflect the combined light from the cross dichroic prism using the polarizing mirror
Implementation Method 3
a first polarizing plate provided between the first self-light-emitting panel and the first incident surface, a second polarizing plate provided between the second self-light-emitting panel and the second incident surface
Data Source
AI summary
A display device includes: a first self-light-emitting panel; a second self-light-emitting panel; a cross dichroic prism configured to cause first image light and second image light to exit as image light of combined light, the first image light exiting from the first self-light-emitting panel and entering, the second image light exiting from the second self-light-emitting panel and entering; a first polarizing plate provided at an exit side of the first self-light-emitting panel; a second polarizing plate provided at an exit side of the second self-light-emitting panel; and a light-guiding optical system including a polarizing mirror and configured to deflect the image light of the combined light. Polarizing axes of the first polarizing plate and the second polarizing plate and a polarizing axis of the polarizing mirror are perpendicular to or parallel to an intersecting axis of the cross dichroic prism.