Dynamic Touch Area Adjustment for Parallax Compensation
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Solution Overview
Problem
Misalignment issues arise in touch screen displays due to parallax, user movement, display curvature, and rotation, leading to inaccuracies in user interaction.
Innovation Solution
A display assembly with a controller that dynamically adjusts touch sensitive areas by applying correction shifts to pixels based on proximity sensing, seat position, and eye reference points, using a proximity sensing system and camera data to calculate offset values and adjust the touch plane coordinates in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed touch sensitive area is used on the display, then the device structure is simple, but misalignment occurs between the touch sensitive portion as seen by the viewer and the touch sensitive portion determined by the display system due to parallax, user movement, display curvature and rotation
Solution Approach 1:
The patent applies dynamics by making the touch sensitive area dynamically adjustable rather than fixed. The controller modifies the touch sensitive area in real-time based on detected viewing conditions (parallax, user movement, display curvature, rotation) to maintain alignment between the displayed touch sensitive portion and the actual touch input location, thereby resolving the misalignment problem without requiring a completely complex new system architecture
Solution Approach 2:
The patent implements feedback by continuously monitoring viewing conditions (such as user position, display orientation, and curvature) and using this information to adjust the touch sensitive area coordinates. This closed-loop feedback mechanism ensures that the touch sensitive area remains accurately aligned with the displayed content despite changes in parallax, user movement, or display configuration
2Ease of manufacture
If the touch plane is spaced far from the image plane, then manufacturing and assembly is easier, but parallax error increases causing greater misalignment
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and compensating for parallax error in the touch sensitive area coordinates. Before the user interacts with the display, the system determines the appropriate coordinate adjustments based on the separation distance between the touch plane and image plane, thereby counteracting the expected parallax misalignment before it occurs
Solution Approach 2:
The patent changes parameters by adjusting the touch sensitive area coordinates based on the separation distance between the touch plane and image plane. When the separation distance is increased for easier manufacturing, the system simultaneously modifies the touch coordinate parameters to compensate for the resulting parallax error, maintaining touch input accuracy despite the physical separation
Data Source
AI summary
A display assembly includes a display console having an image plane spaced from a touch plane. The touch plane includes at least one touch sensitive area. A controller is operatively connected to the display console, and includes a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of dynamically adjusting at least one touch sensitive area in real-time. The controller may be programmed to determine respective correction shifts to each pixel in the touch sensitive area for multiple viewing positions of one or more users. The display console may be curved. The controller may be programmed to simultaneously a first correction shift to a first touch sensitive area for the viewing position of the first user and a second correction shift to a second touch sensitive area for the viewing position of the second user.