Parallax Barrier Head-Up Display for Eye Position Correction
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Solution Overview
Problem
Current head-up display systems in vehicles face challenges in providing clear and distortion-free virtual images to drivers, especially due to variations in eye position and vehicle geometry, leading to reduced visibility and convenience.
Innovation Solution
The proposed image projection apparatus includes a light source apparatus and a display apparatus with a three-dimensional projection system that uses a parallax barrier and correction information to dynamically adjust image projection based on the driver's eye position, reducing distortion and improving image clarity by controlling light emission and projection paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional head-up display system projects virtual images without dynamic correction, then the system structure remains simple, but image distortion occurs due to variations in driver eye position and vehicle geometry
Solution Approach 1:
The system dynamically adjusts the parallax barrier configuration and projection parameters based on detected driver eye position. The controller modifies the display image and barrier alignment in real-time to maintain optimal image quality across different viewing positions, transforming a static system into an adaptive one that compensates for geometric distortions
Solution Approach 2:
The system incorporates eye position detection that provides feedback to the controller, which then adjusts the projection parameters and parallax barrier settings accordingly. This closed-loop control ensures that image distortion is continuously corrected based on the actual driver position, maintaining high manufacturing precision in image delivery
2Ease of operation
If the parallax barrier width is fixed, then the device structure remains simple, but visibility and image quality deteriorate when driver eye position varies
Solution Approach 1:
The parallax barrier width and positioning are made dynamic rather than fixed. The system adjusts these parameters based on detected eye position to optimize visibility for each driver configuration, allowing the barrier to adapt its configuration rather than requiring manual adjustment or complex mechanical mechanisms
Solution Approach 2:
The system changes key optical parameters including parallax barrier width, barrier position, and projection angle based on eye position detection. These parameter adjustments optimize the optical path and image delivery for different driver positions, improving visibility without requiring complex mechanical adjustment mechanisms
3Measurement precision
If correction parameters are predetermined for specific viewpoints, then the system remains relatively simple, but measurement precision of eye position and corresponding correction accuracy are reduced
Solution Approach 1:
The correction parameters are determined dynamically based on real-time eye position detection rather than relying on predetermined lookup tables for specific viewpoints. This allows the system to provide accurate correction for any eye position within the detection range, not just pre-programmed positions
Solution Approach 2:
The system replaces complex mechanical adjustment mechanisms with computational correction. By using image processing and digital signal processing to calculate and apply correction parameters based on detected eye position, the system achieves high measurement precision without requiring complex mechanical correction devices
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 enhances the visibility and convenience of virtual images for drivers by reducing distortion and ensuring clear, high-contrast images, even when the vehicle's geometry causes optical distortions, thereby improving the overall display system's effectiveness.
Implementation Method 1
the projection optical system projects light from the display surface onto the optical member to form a virtual image
Implementation Method 2
projection optical system projects light from the display surface onto the optical member
Implementation Method 3
a parallax barrier and correction information to dynamically adjust image projection
Implementation Method 4
parallax barrier width is adjusted depending on the position of the eyes
Data Source
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AI summary
A light source apparatus (19) includes at least one first light-emitting element (23) and at least one second light-emitting element (24). The at least one first light-emitting element (23) is configured to emit first light towards a first area (ia1) of a transmission-type display panel (20). The at least one second light-emitting element (24) is configured to emit second light towards a second area (ia2) of the transmission-type display panel (20). The maximum luminance of the second light is smaller than the maximum luminance of the first light.