Image Display System Luminance Control for Automotive HUD
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Solution Overview
Problem
Existing image display systems using laser light sources face challenges due to differences in initial rise properties of light, which affect luminance consistency and color reproducibility, particularly when projecting images onto reflective surfaces like windshields in automotive head-up displays.
Innovation Solution
An image display system that adjusts the target luminance value of light sources based on received image signals, allowing for an adjusted value different from the instruction value, thereby managing the initial rise of light to reduce its influence and improve color reproducibility by synchronizing the initial rise of multiple light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different laser light sources are used in the image display system, then the system can achieve higher luminance and better image quality, but the initial rise properties of light differ between light sources causing luminance inconsistency and color reproduction issues
Solution Approach 1:
The control unit changes the target luminance value parameter dynamically based on the light source type and driving state. When the light source is in the initial rise period, the control unit sets a lower target luminance value than the instruction value from the image signal, and gradually increases it to match the instruction value after the initial rise period ends. This parameter adjustment compensates for the different initial rise properties of various laser light sources.
2Speed
If the light source is driven directly with the instruction value from the image signal, then the response time is minimized, but the initial rise properties cause color reproduction degradation and luminance inconsistency
Solution Approach 1:
The control unit performs preliminary detection of the light source's driving state to identify when the initial rise period has elapsed. Based on this preliminary action, the system switches from using adjusted target luminance values during the initial rise period to using the full instruction value after the period ends. This ensures fast response while maintaining color accuracy during the critical initial phase.
Solution Approach 2:
The control unit dynamically adjusts the target luminance value based on the light source's real-time driving state. The system transitions from a static direct drive mode to a dynamic adaptive drive mode where the target value is continuously adjusted according to whether the light source is in the initial rise period or has stabilized, optimizing both response time and color reproduction at different operational stages.
3Manufacturing precision
If a preliminary light emission process is added to compensate for initial rise properties, then luminance consistency is improved, but the system complexity and processing time increase
Solution Approach 1:
The control unit utilizes the light source's own driving state information to automatically determine when the initial rise period has elapsed. By monitoring the light source's operational status and comparing it against predetermined criteria, the system self-adjusts the target luminance value without requiring external intervention or complex additional hardware. This self-service approach simplifies the control process while maintaining luminance consistency.
Data Source
AI summary
The image display system forms an image by scanning with light from a light source of a luminaire. The image display system includes: an input unit configured to receive an image signal indicative of an instruction value of luminance of the light source; and a control unit configured to determine a target value of luminance of the light source based on the instruction value indicated by the image signal received by the input unit. The control unit is configured to perform an adjusting process of setting the target value to an adjusted value different from the instruction value when allowing the light source to emit light based on the image signal.