Meter Display Device Dazzling Suppression via Segmented Backlight Control
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Solution Overview
Problem
Meter display devices struggle to maintain visibility of both meter and lamp display items at night without causing dazzling, as uniformly lowering luminance makes red warning lights difficult to see.
Innovation Solution
A meter display device with a liquid crystal display and an optical sensor that adjusts the display color of the meter item based on illuminance without changing the backlight luminance, ensuring the lamp display items remain easily visible while suppressing dazzling by maintaining their luminance and adjusting the meter item's color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the luminance is uniformly lowered to suppress dazzling at nighttime, then dazzling is suppressed, but the lamp display item (e.g., red warning light) becomes difficult to see
Solution Approach 1:
The patent segments the display items into two categories: meter display items (analog gauges) and lamp display items (warning lights). Different control strategies are applied to each type. The backlight luminance is maintained at a standard level to ensure lamp visibility, while only the meter display item luminance is reduced through pixel value adjustment, preventing dazzling while maintaining reliability.
Solution Approach 2:
The patent applies local quality by differentiating the treatment of different display regions. The meter display item region has its luminance locally reduced by adjusting pixel values, while the lamp display item region maintains full luminance through unchanged backlight illumination. This localized approach allows simultaneous suppression of dazzling in meter areas and preservation of visibility in warning light areas.
2Object-affected harmful factors
If the luminance of the display item is set low at nighttime, then dazzling is suppressed, but the overall visibility of display items is reduced
Solution Approach 1:
The patent changes parameters selectively: the pixel value parameter is reduced for meter display items to lower their luminance and suppress dazzling, while the backlight luminance parameter is maintained at standard levels to preserve overall visibility. This differential parameter adjustment resolves the contradiction between suppressing dazzling and maintaining visibility.
3Object-affected harmful factors
If the backlight luminance is reduced to improve nighttime comfort, then dazzling is suppressed, but the lamp display item visibility is compromised
Solution Approach 1:
The patent segments the backlight control into two independent control paths: one for meter display items and one for lamp display items. The backlight luminance is maintained at standard levels to ensure warning light visibility, while only the meter display item luminance is reduced through pixel value adjustment, preventing dazzling while maintaining reliability.
Data Source
AI summary
A meter ECU changes a display color of a meter display item without changing a luminance of a first backlight of a first display and a display color of a first lamp display item, between when an illuminance detected by an optical sensor is higher than a certain threshold value (step S2, step S3) and when the illuminance is lower than the certain threshold value (step S7, step S8).