HUD Lens Unit Asymmetric Connection Widths
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Solution Overview
Problem
Head-up display devices with light sources arranged at different intervals between rows and columns experience luminance unevenness due to superimposed light emission from connection portions, leading to inconsistent light output.
Innovation Solution
A head-up display device with a lens unit featuring convex lens portions arranged in a matrix, where the intervals between rows and columns differ, and connection portions are formed at the boundaries of adjacent lenses, with the first connection portion extending in one direction and the second in another, ensuring the width of the short direction of the first connection portion is larger than that of the second, to manage light collection and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If connection portions are provided at boundaries of adjacent convex lens portions to suppress superimposition of emitted light, then luminance unevenness is suppressed, but when light source intervals differ between rows and columns, emitted light from connection portions still superimposes and causes luminance unevenness
Solution Approach 1:
The patent applies asymmetry by making the width of the short direction of the first connection portion (extending in the first direction) larger than the width of the short direction of the second connection portion (extending in the second direction). This asymmetric configuration compensates for the different intervals between light sources in rows and columns, preventing superimposition of emitted light from adjacent connection portions and suppressing luminance unevenness.
Solution Approach 2:
The patent applies local quality by differentiating the dimensions of connection portions based on their orientation and position. The first connection portions have different width characteristics than the second connection portions, creating locally optimized light emission control that adapts to the different spatial intervals between light sources in different directions.
2Use of energy by moving object
If convex lens portions are arranged with different intervals in rows and columns to match light source arrangement, then light collection efficiency is improved, but superimposition of light from adjacent sources occurs at connection portions causing luminance unevenness
Solution Approach 1:
The asymmetric width configuration of connection portions compensates for the asymmetric arrangement of light sources and convex lens portions. By making the first connection portions wider in their short direction than the second connection portions, the patent prevents light superimposition while maintaining the efficient light collection geometry.
Solution Approach 2:
The patent changes the geometric parameters of connection portions to match and compensate for the different intervals between light sources. The width of the short direction of connection portions is specifically adjusted based on their orientation, creating a parameter optimization that balances light collection efficiency with luminance uniformity.
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 effectively suppresses luminance unevenness by refracting light from adjacent sources, ensuring consistent light emission and enhancing the structural integrity of the lens unit.
Implementation Method 1
convex lens portions which collect radiant light radiated from the light sources
Data Source
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AI summary
The purpose of the present invention is to provide a head-up display device, and a lens unit, in which luminance unevenness of exit light exiting the lens unit is small even when an interval of light sources arrayed in matrix is different between rows and columns. The head-up display device of the present invention is provided with: a plurality of light sources arrayed in matrix in a Y-direction and a Z-direction; and a lens unit (36) in which a convex lens portion (36b) for collecting radiant light radiated from the light sources is formed opposing each light source. The plurality of light sources are arranged at an interval A in a Z-direction and at an interval B, which is smaller than the interval A, in the Y-direction. The lens unit (36) has a first connection portion (a) and second connection portions (b) formed at boundaries of the adjacent convex lens portions (36b). The first connection portion (a) extends in the Y-direction, and the second connection portions (b) extend in the Z-direction. A width of a short direction of the first connection portion (a) is smaller than a width of a short direction of the second connection portions (b).