Composite Display Layer with Mirror for HMD Light Distribution
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Solution Overview
Problem
In video displays, particularly head-mounted displays, the configuration of optical assemblies often results in a display area that is smaller than the lens coverage area, leading to unused portions of the lens coverage area and reduced light reaching the user's eye.
Innovation Solution
A composite display layer is introduced, comprising a display layer and a parallel mirror layer, with a polarizer layer, which provides a subset of light that is reflected by the mirror layer, allowing for a larger light distribution without enlarging the display layer, ensuring the composite display layer is at least as large as the lens coverage area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display assembly is positioned relative to the lens in a conventional configuration, then the device structure is simple, but the display area becomes smaller than the lens coverage area causing unused portions and reduced light reaching the user's eye
Solution Approach 1:
The patent introduces a mirror layer positioned behind the display assembly to reflect light from the rear side of the display. This adds a spatial dimension (depth/z-axis) to the light path, allowing light to reach the lens from both the front and back of the display assembly, thereby expanding the effective display area without increasing the lateral footprint or complicating the overall device structure
Solution Approach 2:
The mirror layer acts as an intermediary element that redirects light from the display assembly to the lens. By placing the mirror behind the display and using it to reflect light forward, the system effectively utilizes the space between the display and the lens, allowing the display area to match the lens coverage area without requiring a more complex optical configuration
2Illumination intensity
If the display assembly area is increased to match the lens coverage area, then more light reaches the user's eye, but the display layer size must be enlarged which increases device size
Solution Approach 1:
Instead of enlarging the display layer laterally, the patent utilizes the depth dimension by positioning a mirror layer behind the display assembly. This allows light to travel from the rear of the display, reflect off the mirror, and reach the lens, effectively increasing the light distribution area without increasing the display layer's physical dimensions
3Area of stationary object
If a composite display layer with mirror layer is introduced, then light distribution area is increased, but the device structure becomes more complex
Solution Approach 1:
The patent combines the display assembly and mirror layer into a single composite display layer structure. The mirror layer is positioned in direct contact with or immediately behind the display assembly, merging two functional elements into one integrated unit that achieves expanded light distribution without requiring separate mounting structures or complex alignment mechanisms
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 enables more light to be provided to the user's eye over a larger area, optimizing light distribution and utilization within the optical assembly.
Implementation Method 1
a polarizer layer disposed on the composite display layer, where the polarizer layer provides the first portion of the first subset of light to the first mirror layer
Implementation Method 2
a first mirror layer parallel to the first display layer that provides a second subset of light included in the set of composite light, where the second subset of light comprises a reflection of a first portion of the first subset of light
Data Source
AI summary
One embodiment of the present application sets forth an apparatus that includes a composite display layer that transmits a set of composite light. The composite display layer includes a display layer that provides a first subset of light included in the set of composite light, and a first mirror layer parallel to the first display layer that provides a second subset of light included in the set of composite light, where the second subset of light comprises a reflection of a first portion of the first subset of light. The composite display layer also includes a polarizer layer disposed on the composite display layer, where the polarizer layer provides the first portion of the first subset of light to the first mirror layer.