Head-Up Display Lenslet for Luminance Uniformity
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Solution Overview
Problem
Current head-up display backlighting designs fail to achieve desired luminance uniformity across the eyebox and lack flexibility in adjusting luminance intensity, requiring multiple optical elements.
Innovation Solution
A head-up display assembly utilizing a single total internal reflection (TIR) lens array with a lenslet between the TIR lens array and the display element, featuring horizontal or vertical lenses to evenly distribute light and balance luminance uniformity and intensity across the eyebox.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical elements are used in head-up display backlighting, then light distribution can be achieved, but luminance uniformity across the eyebox deteriorates and device complexity increases
Solution Approach 1:
The patent combines multiple optical functions (light collection, collimation, diffusion, and redistribution) into a single integrated optical element with multiple surfaces. This merging approach eliminates the need for separate optical components while achieving the desired light distribution and luminance uniformity across the eyebox.
Solution Approach 2:
The single optical element performs multiple functions simultaneously: it collects light from LEDs, collimates the light beam, diffuses the light, and redistributes energy to achieve uniform luminance across the eyebox. This multi-functional design replaces what traditionally required two or three separate optical elements.
2Adaptability or versatility
If traditional backlighting designs are used, then basic illumination is achieved, but flexibility in adjusting luminance intensity to left and right eyebox position deteriorates
Solution Approach 1:
The optical element incorporates different surface characteristics on its first and second surfaces, with the second surface featuring a plurality of lenses that can be selectively activated. This allows different regions of the optical element to perform different functions, enabling independent adjustment of luminance intensity to the left and right eyebox positions.
Solution Approach 2:
The system enables dynamic adjustment of light distribution by selectively activating different lens groups on the optical element. This allows the luminance intensity to be flexibly adjusted for different eyebox positions, making the head-up display adaptable to various viewing conditions and user positions.
3Ease of manufacture
If current head-up display designs are used, then illumination is provided, but manufacturing complexity and cost increase due to multiple components
Solution Approach 1:
The patent consolidates multiple optical components into a single integrated element, reducing the quantity of parts that need to be manufactured, assembled, and aligned. This merging approach simplifies the manufacturing process and reduces overall manufacturing complexity while maintaining the necessary optical functions.
Solution Approach 2:
The single optical element performs multiple optical functions that traditionally required separate components, thereby reducing the total number of parts. This multi-functional design simplifies the bill of materials and reduces assembly complexity, making the head-up display easier and less costly to manufacture.
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 achieves enhanced luminance uniformity and intensity across the eyebox with reduced component count, cost, and manufacturing complexity, allowing for customizable light distribution and energy savings.
Implementation Method 1
A head-up display assembly utilizing a single total internal reflection (TIR) lens array
Implementation Method 2
The lenslet includes a first side facing the display element and a second side facing the TIR lens array. At least one of the first side and the second side includes a plurality of horizontal lenses or a plurality of vertical lenses configured to evenly distribute light
Data Source
AI summary
A head-up display including a display element illuminated by a plurality of light emitting elements. A lenslet is between a TIR lens array and the display element. The lenslet includes a first side facing the display element and a second side facing the TIR lens array. At least one of the first side and the second side includes a plurality of horizontal lenses or a plurality of vertical lenses configured to evenly distribute light from the TIR lens array across an eyebox generated by the head-up display and balance luminous uniformity and luminous intensity across the eyebox.