Head-Up Display Backlight Defect Detection Circuit
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Solution Overview
Problem
Existing head-up display systems do not effectively notify the host of defects in the backlight, which can reduce display image visibility, and existing technologies do not provide specific position information of faulty light sources for error detection and correction.
Innovation Solution
A circuit device with a distortion correction circuit, failure information acquisition circuit, position information acquisition circuit, and host interface circuit that converts panel-side light source position information into input-side light source position information to notify the host of faulty light sources and facilitate error handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backlight defect detection is implemented, then reliability is improved, but device complexity increases due to additional position information conversion and host notification circuits
Solution Approach 1:
The patent combines the backlight defect detection function with the existing distortion correction circuit. The distortion correction circuit simultaneously performs its primary function of correcting image distortion and detects backlight defects by monitoring light source positions, thereby integrating multiple functions into a single circuit to avoid increasing overall device complexity.
Solution Approach 2:
The patent introduces a position information acquisition circuit as an intermediary component that converts panel-side light source position information into input-side light source position information. This intermediary circuit facilitates communication between the distortion correction circuit and the host, enabling defect notification without requiring complex direct integration.
2Measurement precision
If position information conversion is performed, then measurement precision is improved for defect localization, but loss of time increases due to additional conversion processing
Solution Approach 1:
The patent performs position information conversion in advance by maintaining a pre-established correspondence relationship between panel-side coordinates and input-side coordinates. When a backlight defect is detected, the position information can be quickly converted using pre-calculated transformation parameters, reducing the time required for real-time defect localization.
Solution Approach 2:
The patent creates a coordinate transformation model that copies the spatial relationship between the display panel and input image. By establishing a mathematical mapping between panel-side and input-side coordinate systems, the system can rapidly convert position information without performing complex real-time calculations, thus minimizing processing time.
Data Source
AI summary
A circuit device is used in a display device. The display device includes a display panel and a backlight including a plurality of light sources. The circuit device includes a distortion correction circuit, a failure information acquisition circuit, a position information acquisition circuit, and a host interface circuit. The distortion correction circuit executes distortion correction on input image data to output output image data after the distortion correction. The failure information acquisition circuit acquires failure information of the light sources. The position information acquisition circuit converts panel-side light source position information, which is position information of a faulty light source indicated by the failure information on the display panel, into input-side light source position information, which is position information of the faulty light source on the input image data. The host interface circuit outputs the input-side light source position information to a host.