Stepped Light Guide Layout for Uniform HMD Display Luminance
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Solution Overview
Problem
Existing display devices, particularly head-mounted displays (HMDs), face challenges in achieving uniform luminance distribution of illumination and image light without increasing manufacturing costs, especially when using notched or stepped corners to avoid user interference.
Innovation Solution
The use of a light guide with a specific edge configuration, including alternating short edges and symmetrical step-shaped edges for the light guide and reflector plates, ensures uniform luminance distribution by optimizing light reflection and emission, allowing a single type of illumination device to be used for both display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If notched or stepped corners are used in the light guide to avoid user interference, then user comfort is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The light guide employs asymmetric edge configurations where the first and second edges have different shapes (one notched, one stepped) to create directional light control. This asymmetry allows the device to maintain user comfort while managing manufacturing complexity through purposeful differentiation rather than uniform complexity throughout the structure.
Solution Approach 2:
Different regions of the light guide are given different edge characteristics - the first edge has a notched configuration while the second edge has a stepped configuration. This local differentiation optimizes light emission properties in specific areas while containing overall structural complexity to only where necessary for functional performance.
2Manufacturing precision
If different types of illumination devices are used for different display panels, then display quality is improved, but manufacturing cost increases
Solution Approach 1:
The illumination device is designed with a universal structure that can be used for both first and second display panels. The light guide's asymmetric edges and reflector plate configuration enable a single device type to serve multiple functions, maintaining display quality while reducing manufacturing costs through component standardization.
Solution Approach 2:
The patent combines the illumination functions for multiple display panels into a single illumination device type. By integrating the asymmetric edge design and reflector plate into one unified structure, the patent eliminates the need for separate illumination devices for different panels, thereby merging manufacturing processes and reducing costs.
3Illumination intensity
If complex edge configurations are used in the light guide, then luminance uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The light guide edges are segmented into distinct notched and stepped portions rather than using uniformly complex configurations. This segmentation allows for simpler, more manufacturable edge sections while achieving luminance uniformity through the strategic placement of different edge types at specific locations within the light guide structure.
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 achieves uniform luminance distribution in the illumination and image light, reducing manufacturing costs by using a single type of illumination device for both display panels, thus enhancing the display quality and cost-effectiveness.
Implementation Method 1
a light guide including a first edge and a second edge extending in a first direction, a third edge and a fourth edge extending in a second direction intersecting the first direction
Data Source
AI summary
According to one embodiment, an illumination device includes a light guide including a first edge and a second edge extending in a first direction, a third edge and a fourth edge extending in a second direction, a fifth edge provided between the first edge and the third edge, a sixth edge provided between the second edge and the third edge, and the fifth edge includes a first short edge extending in the first direction and a second short edge extending in the second direction, which are arranged alternately, and the sixth edge includes a third short edge extending in the first direction and a fourth short edge extending in the second direction, which are arranged alternately.