HUD Backlight Circuit for Transparent Area Light Suppression
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Solution Overview
Problem
Head-up display devices project light onto transparent areas without display objects, causing them to appear whitish, which reduces visibility of the background, especially in dark environments.
Innovation Solution
A circuit device with a distortion correction circuit and an image analysis circuit that performs distortion correction and backlight control by turning off light emitting elements corresponding to transparent areas in the display panel, ensuring these areas remain transparent rather than appearing whitish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the head-up display device projects light onto the transparent screen, then the virtual image can be displayed, but the transparent area without display objects appears whitish instead of remaining transparent
Solution Approach 1:
The backlight is divided into multiple independently controllable light emitting elements corresponding to different display areas. The circuit device segments the backlight control into region-specific management, allowing different areas to be controlled independently based on whether they contain display objects or remain transparent.
Solution Approach 2:
Different regions of the backlight are assigned different control characteristics. Light emitting elements corresponding to display areas with objects receive different control signals compared to those corresponding to transparent areas. The image analysis circuit identifies transparent regions and the distortion correction circuit calculates corresponding backlight control signals to maintain transparency in specific local areas.
2Object-affected harmful factors
If the light emitting elements are turned off in transparent display areas, then the background visibility is improved, but the display area coverage is reduced
Solution Approach 1:
The system applies different backlight control strategies to different regions. In areas where the display panel shows transparent content, the corresponding light emitting elements are turned off to maintain true transparency and improve background visibility. In areas with display objects, the light emitting elements remain active to ensure proper display. This local differentiation resolves the contradiction between overall display coverage and background visibility.
Data Source
AI summary
A circuit device is used in a head-up display device including a display panel and a backlight device having a plurality of light emitting elements. The circuit device includes a distortion correction circuit and an image analysis circuit. The distortion correction circuit performs distortion correction on input image data and outputs output image data after the distortion correction. The image analysis circuit analyzes image data to be analyzed, which is the input image data or the output image data, and, based on an analysis result, and performs backlight control processing of turning off a light emitting element corresponding to a display area that becomes transparent when projected by the head-up display device among a plurality of display areas corresponding to the plurality of light emitting elements in the display panel.