Eyecup-Display Alignment Calibration for VR Headsets
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Solution Overview
Problem
Virtual reality head-mounted displays (HMDs) face an issue during manufacturing where the electronic display panel is not glued in place but coupled to the eyecup via clips, resulting in a potential offset between the centerlines of the display panel and the eyecup, leading to a distorted image for the user due to misalignment.
Innovation Solution
An apparatus using an imaging device with a wide-angle lens to capture images of the electronic display panel through the eyecup, coupled with a calibration controller to perform a mapping between the panel's pixels and the imaging device's sensor pixels, minimizing the offset by determining the preferred alignment and storing this data for accurate image presentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electronic display panel is coupled to the eyecup via clips during manufacturing, then the assembly process is simplified and disassembly is easier, but an offset between the centerlines of the display panel and eyecup occurs, causing image distortion
Solution Approach 1:
The patent performs alignment calibration before final assembly by capturing images of the display panel through the eyecup, determining the offset between centerlines, and pre-calculating compensation parameters that are stored for use during operation, thus eliminating the need for precise mechanical alignment during assembly
Solution Approach 2:
The patent changes the parameter space by transitioning from physical mechanical alignment to digital parameter compensation, where the offset between display panel and eyecup centerlines is measured and compensated through software algorithms rather than mechanical adjustment
2Ease of repair
If the electronic display panel is coupled to the eyecup via clips, then rework and repair become easier, but the image appears shifted and distorted to the user
Solution Approach 1:
The patent creates a digital model (copy) of the actual optical path by capturing images through the eyecup and analyzing the displayed patterns, then uses this digital model to calculate compensation parameters that correct the image distortion without affecting the physical clip-based assembly
Solution Approach 2:
The patent replaces the mechanical alignment system with an optical-digital measurement and compensation system, where image quality is maintained through software-based offset compensation rather than mechanical precision, allowing clip-based assembly while preserving image quality
3Measurement precision
If an imaging device with wide-angle lens is used to capture images through the eyecup, then the alignment can be measured accurately, but the device complexity increases
Solution Approach 1:
The patent uses a standard imaging device (camera with wide-angle lens) that can be positioned to capture the entire display panel through the eyecup, making the measurement apparatus relatively simple while achieving the required measurement precision through proper optical setup and image processing algorithms
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 solution ensures that images appear centered and undistorted to the user by iteratively adjusting the alignment data, allowing for precise integration of the eyecup assembly into HMDs and optional upload to memory or cloud storage for future reference.
Implementation Method 1
an imaging device (e.g., a camera) with a lens (e.g., a wide angle lens) that is positioned to image the electronic display panel through its corresponding eyecup
Implementation Method 2
The imaging device is configured to capture one or more images of image light projected by the electronic display panel through the eyecup
Data Source
AI summary
An apparatus for aligning an eyecup to an electronic display panel of a head-mounted display is presented in this disclosure. The eyecup is coupled to the electronic display panel forming an eyecup assembly. An imaging device captures one or more images of image light projected by the electronic display panel through the eyecup. A calibration controller, interfaced with the electronic display panel and the imaging device, determines physical locations of pixels of the electronic display panel on a sensor of the imaging device based on the captured one or more images. The calibration controller also determines a preferred alignment for presenting images by the electronic display panel based on the determined physical locations of the pixels and a projected location of the eyecup.