HMD Display Start Position Correction for Assembly Misalignment
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Solution Overview
Problem
The manufacturing process of head-mounted displays (HMDs) faces challenges due to assembly errors causing misalignment between panels and lenses, leading to increased development costs and data transfer amounts, as well as a complicated process for shifting image drawing positions to correct these errors.
Innovation Solution
A head-mounted display system with a left and right screen, lenses, storage unit, acquisition unit, and control unit, where the display start positions of images are set based on misalignment, and images are generated and displayed to match the size of the lenses, allowing for efficient absorption of assembly errors without requiring complex data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drawing positions of left-eye and right-eye images are shifted to correct assembly misalignment, then the stereoscopic effect is improved, but the device complexity and data transfer amount increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the optimal display start positions for left-eye and right-eye images in a storage unit during the manufacturing process. These positions are determined based on measured misalignment amounts between optical components. During operation, the control unit simply retrieves these pre-stored positions without performing complex real-time calculations, thereby maintaining stereoscopic accuracy while simplifying the operational complexity.
Solution Approach 2:
The patent uses copying by creating and storing copy data representing the misalignment characteristics of each HMD unit in the storage unit. Instead of transmitting complex correction algorithms or performing real-time measurements, the system copies the essential misalignment information (display start positions) into storage, enabling efficient retrieval and application during image display without repeating complex processing.
2Manufacturing precision
If assembly precision is increased to reduce misalignment, then the stereoscopic effect is improved, but the manufacturing cost increases
Solution Approach 1:
The patent converts the harmful effect of assembly misalignment into a beneficial parameter by measuring the actual misalignment amount during manufacturing and using this information to set optimal display start positions. Instead of treating misalignment as a defect to be eliminated through costly precision manufacturing, the system embraces the variation and transforms it into personalized correction data stored for each HMD unit, thereby achieving accurate stereoscopic effects without increasing manufacturing precision requirements or costs.
Solution Approach 2:
The patent applies parameter changes by adjusting the display start position parameters of images based on the measured misalignment characteristics of each HMD unit. Rather than attempting to physically reposition components to achieve perfect alignment, the system changes the software parameter (display start position) to compensate for the physical misalignment, achieving correction through parameter adjustment rather than physical modification.
3Quantity of substance
If the image size is reduced to match the lens size, then the data transfer amount is reduced, but the visible image area decreases
Solution Approach 1:
The patent applies local quality by concentrating the image data transmission effort on the specific region that corresponds to the lens aperture area. Instead of transmitting and displaying images at full panel resolution, the system determines the effective display region defined by the lens size and transmits only the image data for this specific local area. This ensures that data transfer amount matches the actual visible area through the lens, eliminating waste of bandwidth on non-visible regions while maintaining optimal image quality in the visible zone.
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 reduces assembly errors and data transfer amounts, simplifying the image generation process and reducing power consumption, thereby providing a cost-effective and efficient method for achieving correct stereoscopic effects in HMDs.
Implementation Method 1
a left lens that magnifies the left-eye image displayed on the left screen and presents the magnified left-eye image to a user
Implementation Method 2
a right lens that magnifies the right-eye image displayed on the right screen and presents the magnified right-eye image to the user
Data Source
AI summary
A left panel has a portion exceeding a size of a left lens, and a left-eye image displayed in an area of the left panel, which exceeds the size of the left lens, is not visually recognized by a user. A right panel has a portion exceeding a size of a right lens, and a right-eye image displayed in an area of the right panel, which exceeds the size of the right lens, is not visually recognized by the user. An HMD stores a display start position of the left-eye image and a display start position of the right-eye image. The HMD acquires a left-eye image having a size corresponding to the size of the left lens and a right-eye image having a size corresponding to the size of the right lens, which are generated by an external apparatus. The HMD causes the left-eye image to be displayed from the display start position of left-eye image stored in advance and causes the right-eye image to be displayed from the display start position of right-eye image stored in advance.