Head-Up Display Virtual Image Correction System
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Solution Overview
Problem
Existing head-up display systems experience display delay and restricted drawable areas due to vibration corrections, leading to image defects when projecting virtual images in target spaces, particularly in vehicles.
Innovation Solution
An image display system with a first and second correction unit that adjust the display position of virtual images based on different orientation signals, allowing for separate processing stages to address slow and fast orientation changes, reducing display delay and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration correction is performed during drawing processing of the display image, then the positional relation between the virtual image and target object can be maintained, but display delay occurs and the drawable area is restricted
Solution Approach 1:
The patent divides the correction process into two independent segments: (1) correction of the drawing area based on slow orientation changes, and (2) correction of the display image position based on fast orientation changes. This segmentation allows each correction to be performed at appropriate timing without causing display delay or restricting drawable area.
Solution Approach 2:
The patent performs the drawing area correction in advance during the drawing processing stage, before the display image is generated. This preliminary action ensures that the correction is already in place when the display image is created, eliminating the need for real-time correction during display and avoiding display delay.
2Measurement precision
If vibration correction is performed during drawing processing, then the virtual image position can be maintained, but the drawable area is restricted to a narrow area
Solution Approach 1:
The patent separates the correction operations into two distinct stages with different drawable area requirements. The drawing area correction uses a first drawable area determined from slow orientation changes, while the display image correction uses a second drawable area determined from fast orientation changes. This allows each correction to operate with appropriate area constraints.
Solution Approach 2:
The patent dynamically adjusts the correction approach based on the type of orientation change. For slow orientation changes, it corrects the drawing area with larger margin. For fast orientation changes, it corrects the display image position with real-time precision. This dynamic adaptation maximizes the usable drawable area while maintaining positional accuracy.
3Measurement precision
If displacement correction is applied to maintain virtual image position, then the positional relation with target object is maintained, but the display image may go out of range of display surface
Solution Approach 1:
The patent segments the correction process into drawing area correction and display image correction. The drawing area correction anticipates the needed adjustment space based on slow orientation changes, while the display image correction handles fast orientation changes. This segmentation prevents image portions from going out of range by pre-calculating appropriate drawing areas.
Solution Approach 2:
The patent performs preliminary correction of the drawing area based on slow orientation changes before generating the display image. This preliminary action ensures that the display image will remain within the display surface boundaries even when fast orientation changes occur during display, maintaining image completeness and reliability.
Data Source
AI summary
An image display system includes a display unit displaying an image, a projection unit projecting in a target space a virtual image corresponding to the image with an output light of the display unit, a body unit provided thereto the display unit and the projection unit, and an image producing unit including a first correction unit and a second correction unit. The first correction unit performs a first correction processing of correcting, based on a first orientation signal indicative of a first orientation change of the body unit, a display position of the virtual image in the target space. The second correction unit performs a second correction processing of correcting, based on a second orientation signal indicative of a second orientation change of the body unit which is faster than the first orientation change, the display position of the virtual image in the target space.