Inclined Screen HUD with 2D Movement for Resolution
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Solution Overview
Problem
Conventional vehicular head-up display devices require a wide screen movement to adjust the distance of a virtual image from the driver's eyes, which compromises the imaging capability and resolution of the virtual image.
Innovation Solution
A display device with a screen inclined relative to a reference plane, a drive unit for moving the screen between two positions, and an irradiation unit with an imaging optical system that scans the screen to form images, ensuring the focal position locus remains within the screen's movement range, maintaining image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the screen moving range is extended to widen the adjusting width of the distance from the driver's eyes to the virtual image, then the adjusting width is improved, but the imaging capability and resolution of the virtual image deteriorate
Solution Approach 1:
The patent introduces a new degree of freedom by enabling the screen to move not only in the depth direction (orthogonal to the screen surface) but also in the lateral direction (parallel to the screen surface). This two-dimensional movement capability allows the system to adjust the virtual image distance without compromising imaging resolution, as the lateral movement component compensates for the reduced depth movement range.
Solution Approach 2:
The patent changes the movement parameters of the screen by allowing movement in multiple directions rather than restricting it to a single depth direction. This parameter change enables the system to achieve a wider adjusting width while maintaining the screen within a limited movement range that preserves imaging capability and virtual image resolution.
2Adaptability or versatility
If the screen moving range is extended to adjust the virtual image distance, then the adjusting width is improved, but the imaging capability on the screen deteriorates
Solution Approach 1:
By adding lateral movement capability to the screen mechanism, the system achieves distance adjustment functionality without requiring extensive depth movement that would compromise imaging capability. The two-dimensional movement space provides alternative paths to achieve the same functional goal while preserving image quality.
Solution Approach 2:
The patent implements a dynamic screen positioning system that can adjust its position in two dimensions based on operational requirements. This dynamic capability allows the system to optimize the screen position for both distance adjustment and imaging quality maintenance, rather than relying on a fixed or single-degree-of-freedom movement mechanism.
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 configuration suppresses the lowering of virtual image resolution while reducing the necessary screen movement range, enhancing the display device's performance and efficiency.
Implementation Method 1
The irradiation unit includes an imaging optical system, and is configured to cause the imaging optical system to irradiate the screen with light to scan the display plane of the screen to form an image on the display plane
Implementation Method 2
The projection unit projects the incident light to a reflective member to allow the reflective member to reflect the incident light to form a virtual image corresponding to the image described above in a target space
Data Source
AI summary
In a display device, an irradiation unit includes an imaging optical system. The imaging optical system scans and irradiates a front surface of a screen with light to form an image. The light passing through the screen and output from the screen in a movement direction is incident on a projection unit as incident light. The projection unit irradiates a reflective member with the incident light to allow the reflective member to reflect the incident light to form a virtual image corresponding to the image in a target space. A locus of a focal position of the imaging optical system when the irradiation unit wholly scans the front surface of the screen is within a range between the front surface of the screen at a first position and the front surface of the screen at a second position.