Holographic Panel Head-Up Display for Flexible Illumination Positioning
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Solution Overview
Problem
Traditional head-up display systems face limitations in positioning the illumination device due to packaging constraints, which affects the reflection angle of light, leading to potential polarization-dependent visibility issues and restricted placement.
Innovation Solution
A head-up display system incorporating a holographic panel coupled to the windshield that diffracts display light toward the driver's eyes, allowing for flexible positioning of the illumination device and ensuring light reaches the driver regardless of entrance and exit angles, with the holographic panel disposed along a portion of the windshield and capable of refracting light within specific thickness and refractive index modulation ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional reflection-based head-up display is used, then the system structure is simple, but the illumination device positioning is restricted by packaging requirements and angle constraints
Solution Approach 1:
A holographic diffuser is introduced as an intermediary component between the illumination device and the windshield. This diffuser contains diffractive optical elements that mediate the light path, enabling the illumination device to be positioned at angles different from the reflection angle while still directing light to the driver's eyes through the windshield.
Solution Approach 2:
The system changes the optical parameters by using diffraction instead of reflection. The holographic diffuser modifies the light direction through diffractive optical elements with specific grating periods and orientations, allowing independent control of incident and exit angles, thus decoupling the positioning constraints of the illumination device.
2Ease of operation
If the illumination device is positioned according to packaging requirements, then the device can be integrated into the vehicle, but the reflection angle may not align with the driver's line of sight
Solution Approach 1:
The holographic diffuser acts as an intermediary that decouples the alignment between the illumination device and the driver's line of sight. It contains pre-calculated diffractive patterns that redirect light from various incident angles to the specific exit angle required for driver visibility, eliminating the need for precise angular alignment during assembly.
Solution Approach 2:
The diffractive optical elements in the holographic diffuser are pre-designed and pre-positioned to compensate for packaging constraints. The grating patterns are calculated in advance to redirect light from the illumination device's packaged position to the correct viewing angle, ensuring proper alignment without requiring complex adjustment procedures during assembly.
3Reliability
If the exit angle equals the incident angle (reflection), then the optical path is simple, but polarization-dependent visibility issues occur
Solution Approach 1:
The system replaces the mechanical reflection-based optical path with a diffraction-based optical path using holographic elements. This substitution eliminates polarization-dependent visibility issues because diffraction through the holographic diffuser does not exhibit the same polarization sensitivity as reflection from the windshield, providing more consistent visibility across different viewing conditions.
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 packageability of the illumination device and ensures consistent information transmission to the driver, improving visibility and reducing distracted driving by allowing the illumination device to be positioned without strict angle constraints, while also addressing polarization-dependent visibility issues.
Implementation Method 1
a holographic panel coupled to and extending with the windshield and arranged to diffract the display light toward the eyes of the occupant. The display light emits toward the holographic panel in an entrance direction at an entrance angle relative to an axis normal to the holographic panel and diffracts away from the holographic panel in an exit direction at an exit angle relative to the axis, which is different than the entrance angle.
Data Source
AI summary
A head-up display system of a vehicle visually transmits information to eyes of an occupant. The head-up display system comprises an illumination device configured to emit a display light and a windshield spaced from the illumination device and extending transverse to the display light. The head-up display system comprises a holographic panel coupled to and extending with the windshield and arranged to diffract the display light toward the eyes of the occupant. The display light emits toward the holographic panel in an entrance direction at an entrance angle relative to an axis normal to the holographic panel and diffracts away from the holographic panel in an exit direction at an exit angle relative to the axis, which is different than the entrance angle.