Optical Module Compact Layout via Cross Dichroic Prism Bonding
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Solution Overview
Problem
Existing optical modules that combine RGB image light from three display panels using a cross dichroic prism are unable to sufficiently reduce their size due to space constraints, limiting their integration in compact display apparatus.
Innovation Solution
The optical module design includes three rectangular image display panels with drive circuit parts positioned on the outer side of a cross dichroic prism, allowing them to be bonded in a configuration where their long sides align with the cross axis, enabling a more compact layout and reducing the module's dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a cross dichroic prism and three display panels are combined in a conventional configuration, then image synthesis function is achieved, but the optical module size cannot be sufficiently reduced
Solution Approach 1:
The patent applies dimensional change by transitioning from a planar arrangement of display panels to a three-dimensional configuration where panels are positioned at different depths relative to the cross dichroic prism. Specifically, the first display panel is positioned closer to the prism while the second and third panels are positioned farther away, creating a stepped arrangement that optimizes optical paths and enables compact overall dimensions.
Solution Approach 2:
The patent implements nesting by positioning the drive circuit parts within the spatial envelope defined by the display parts and cross dichroic prism. The drive circuit parts are arranged in regions between the display parts and the prism, effectively utilizing available space and creating a compact integrated structure where components are nested within the overall module boundary.
2Length of stationary object
If display panels are positioned close to the cross dichroic prism, then optical path length is reduced, but drive circuit parts become difficult to position
Solution Approach 1:
The patent applies segmentation by dividing the optical module into distinct functional zones: a first region containing the first display panel and its drive circuit parts positioned closer to the prism, and a second region containing the second and third display panels positioned farther from the prism. This spatial segmentation allows drive circuit parts to be positioned in available gaps between display panels and the prism, maintaining short optical paths while preserving positioning feasibility.
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 allows for a significant reduction in the size and weight of the optical module, facilitating its integration in head-mounted display apparatus while maintaining effective image synthesis and projection.
Implementation Method 1
a cross dichroic prism including a two of photosynthesis surfaces, and configured to synthesize first image light emitted from the first image display panel, second image light emitted from the second image display panel, and third image light emitted from the third image display panel
Data Source
AI summary
An optical module in the present disclosure includes a first image display panel including a first display part and a first coupling part, a second image display panel including a second display part and a second coupling part, a third image display panel including a third display part and a third coupling part, and a cross dichroic prism configured to synthesize first, second, and third image light. The cross dichroic prism has a cross axis at which a two of photosynthesis surfaces cross each other. The first, second, and third image display panel are respectively bonded to different surfaces of the cross dichroic prism in a state where a long side of each of the first, second, and third display part extends along the cross axis and where the first, second, and third coupling part are each positioned on an outer side of the cross dichroic prism.