Vehicle Display Light-Shielding Wall Gradient Transmittance
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Solution Overview
Problem
Conventional vehicle display devices experience a decrease in image visibility at the boundary between regions visible to both eyes and those not visible to both eyes, leading to potential misalignment and recognition of double images due to brightness discontinuities and shape differences.
Innovation Solution
A vehicle display device with a light-shielding wall and adjustment parts that have a gradation in light transmittance decreasing toward the ends in the image width direction, or include holes with smaller opening areas toward the ends, to reduce light penetration and enhance visibility by making the image blurry at the boundary, thereby minimizing the occurrence of double images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a light-shielding wall is used to define the display region, then the image boundaries are clearly defined, but brightness discontinuities occur at the boundaries causing visibility degradation
Solution Approach 1:
The patent applies local quality by creating a gradient transmittance structure where the light-shielding wall has varying light transmission properties. The wall includes a first region with higher light transmittance and a second region with lower light transmittance, allowing different parts of the boundary to have different optical characteristics. This gradient structure softens the abrupt brightness transition while maintaining clear image boundaries.
Solution Approach 2:
The patent changes the optical parameter (light transmittance) of the light-shielding wall along its structure. By varying the transmittance from the first region to the second region, the patent creates a gradual brightness transition that eliminates sudden contrast changes at the image boundaries, thereby preventing visibility degradation.
2Ease of manufacture
If the light transmittance is uniform across the light-shielding wall, then the manufacturing is simplified, but visibility decreases at the boundary between regions visible to both eyes and those not visible
Solution Approach 1:
The patent divides the light-shielding wall into distinct regions with different optical properties. The first region has higher light transmittance while the second region has lower light transmittance, allowing each region to be optimized for its specific function while maintaining overall manufacturing feasibility through systematic regional differentiation.
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 enhances the visibility of images at the boundary between regions by reducing brightness discontinuities and shape differences, preventing the recognition of double images and improving the overall display quality.
Implementation Method 1
a light-shielding wall 23 configured to prevent the display light 70 from scattering
Implementation Method 2
a translucent layer is provided on an optical path of the image light, and the light transmittance of the translucent layer gradually decreases toward the outer edge of the virtual image
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A vehicle display device includes: an image display configured to emit display light of an image (40); an optical system configured to project the display light emitted from the image display onto a reflection face ahead of a driver; and an adjustment part (26) provided in an optical path of the display light from the image display to the reflection face, in which the image includes: a first region (41) visible to both eyes of the driver; and a second region (42) that is closer to ends in the image width direction (GW) than the first region in the image is, the adjustment part is disposed at a position corresponding to the boundary between the first region and the second region, and the adjustment part is configured such that the amount of the display light penetrating the adjustment part is reduced toward the ends in the image width direction.