Vehicle Head-Up Display Illumination Matrix
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Solution Overview
Problem
Existing display devices for motor vehicles, such as head-up displays, face challenges with high energy consumption and heat generation due to the need for high luminosity light sources, particularly in varying temperature conditions, where only a small portion of light is perceived by the viewer and dark areas are often blocked by transilluminated TFT displays.
Innovation Solution
A display device with a screen matrix and an illumination matrix, where light-emitting elements are selectively activated based on stored illumination patterns specific to classes of images, allowing for reduced luminous intensity and minimizing power consumption and heat generation by assigning specific lighting elements to corresponding areas of the screen matrix, with the ability to differentiate between light and dark areas and adjust brightness levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high luminosity light sources are used for backlighting TFT displays, then the display visibility is improved, but power consumption increases
Solution Approach 1:
The backlighting system is divided into multiple individually controllable light-emitting elements arranged in an illumination matrix corresponding to the screen matrix. Each light-emitting element can be selectively activated or deactivated based on the specific display requirements, allowing only the necessary portions of the display to be illuminated at any given time, thereby reducing overall power consumption while maintaining visibility where needed.
2Illumination intensity
If high luminosity light sources are used for backlighting, then the display brightness is improved, but heat generation increases
Solution Approach 1:
Different regions of the display are illuminated with different intensities based on local requirements. The control device activates specific light-emitting elements corresponding to areas where image content requires illumination, while leaving other areas dark. This localized illumination approach reduces the total heat generation across the display system compared to uniform full-screen backlighting, while still providing adequate brightness in the necessary regions.
3Area of stationary object
If the entire screen matrix is transilluminated, then the display coverage is improved, but energy efficiency deteriorates
Solution Approach 1:
The illumination pattern of the screen matrix is made dynamic and adaptable to the specific display content. The control device analyzes the image data and selectively activates light-emitting elements in the illumination matrix corresponding to areas where content is displayed, while deactivating elements corresponding to dark or non-display areas. This dynamic illumination adjustment maintains full display coverage capability when needed while significantly improving energy efficiency when the entire screen does not require illumination.
4Manufacturing precision
If polarization filters are used in the light path, then the display quality is improved, but light transmission efficiency deteriorates
Solution Approach 1:
The system compensates for the light transmission losses introduced by polarization filters by dynamically adjusting the intensity parameters of the light-emitting elements. The control device increases the luminous intensity of active light-emitting elements to compensate for the approximately 50% light loss from polarization filtering, ensuring that sufficient light reaches the viewer while minimizing the number of light-emitting elements that need to be activated, thereby balancing display quality with energy efficiency.
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 approach reduces power consumption and heat input by minimizing the number of active light-emitting elements and adjusting illumination levels, ensuring efficient energy use and reliable operation under adverse temperature conditions while maintaining clear image display.
Implementation Method 1
use of light-emitting diodes with a collimation device
Implementation Method 2
illumination matrix for at least partially transilluminating the screen matrix
Implementation Method 3
display in the manner of a projection onto a windshield of a driver vehicle is projected or is reflected in the driver's eye via the windshield or an additional reflecting pane (combiner pane)
Data Source
AI summary
The invention relates to a display device (5) for a motor vehicle (1), in particular a head-up display, comprising a screen matrix (21) and a lighting matrix (15), having a plurality of light elements (16, 17, 18), for at least partially shining through the screen matrix (21), and comprising a control device (27) of the lighting matrix (15), characterised by one or more lighting patterns stored in a storage device (28), for selectively and differentially actuating the light elements (16, 17, 18) in accordance with the types of images to be displayed. In this way, light-saving lighting patterns of a lighting matrix can be used for determined application images, such that both the energy consumption of the assembly is reduced, and the production of heat is limited.