Vehicle Head-Up Display Curvature Correction via Polarization
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Solution Overview
Problem
Existing vehicular head-up display devices suffer from image surface curvature distortion due to the shape of windshields and optical systems, leading to reduced visibility of projected images, and existing solutions like using a curved screen result in light scattering and reduced light utilization efficiency.
Innovation Solution
A projection display device for vehicles that uses a flexible display device with a shape holding member to form a curved image, which is then introduced into the optical system, allowing for correction of image surface curvature without a special screen, and includes an optical correction member to further enhance image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a curved screen is used to correct image surface curvature, then image distortion is reduced, but light scattering increases and light utilization efficiency decreases
Solution Approach 1:
The patent removes the curved screen from the optical system entirely. Instead of using a curved screen to correct image surface curvature, the invention extracts this function by using a flat screen combined with a wave plate that modifies the polarization state of light to achieve curvature correction without the light scattering problems associated with curved screens
Solution Approach 2:
The patent introduces a wave plate as an intermediary element between the light source and the flat screen. This wave plate modifies the polarization state of the light to enable curvature correction functionality without requiring a physically curved screen, thus avoiding light scattering while maintaining image quality
2Manufacturing precision
If a curved screen is used to correct image surface curvature, then image distortion is reduced, but visibility deteriorates due to external light
Solution Approach 1:
The patent removes the curved screen that causes external light scattering. By using a flat screen with polarization control via a wave plate, the system eliminates the source of external light interference while maintaining the ability to correct image surface curvature
Solution Approach 2:
The patent utilizes polarization state changes (analogous to color changes in optical properties) through the wave plate to control light interaction. By modifying the polarization state, the system achieves curvature correction while reducing sensitivity to external light, improving visibility in bright conditions
3Strength
If the windshield has a curved surface shape, then it provides structural integrity, but image distortion increases
Solution Approach 1:
The patent introduces a wave plate as an intermediary optical element that compensates for the distortion caused by the curved windshield. This wave plate modifies the polarization state of light to counteract the image surface curvature effects, allowing the windshield to maintain its necessary curved shape for structural reasons while preserving image quality
Solution Approach 2:
The patent changes the polarization parameter of the light using a wave plate. By adjusting the polarization state, the system compensates for the distortion introduced by the curved windshield surface, enabling the windshield to maintain its structurally necessary curved shape while correcting image quality
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
The solution effectively reduces image surface curvature and improves visibility of the display image by adjusting the light path to match the windshield shape, maintaining high light utilization efficiency and preventing external light interference.
Implementation Method 1
projection display device for vehicle which performs display by using light reflection on a windshield (window glass) of a vehicle
Data Source
AI summary
A projection display device for a vehicle which allows visual recognition of a virtual image of a display image from a predetermined eye point, the device includes: a projection portion which projects light to be imaged as the display image on a display surface which is formed by a light reflection member in a windshield of a vehicle or in the vicinity of the windshield; an optical system which guides the light projected from the projection portion to the display surface; and an adjustment mechanism which adjusts the light before being introduced to the optical system so as to allow light derived from a curved image of which at least a part is curved to be introduced to the optical system.