Image Display Device Illuminance Stability Control
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Solution Overview
Problem
Existing image display devices are prone to fluctuations in image brightness due to sensitive responses to changes in peripheral illuminance, leading to unstable image adjustments, especially when illuminance sensors and operating buttons are adjacent, causing frequent brightness adjustments.
Innovation Solution
An image display device with an external light measurement unit that measures illuminance multiple times, generates measurement values, and uses history data and hysteresis data to determine stable conditions, allowing for adjustments based on color mode data to maintain consistent image brightness despite changes in illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the illuminance sensor responds sensitively to changes in peripheral illuminance to adjust image brightness, then the image brightness adapts quickly to environmental changes, but the image brightness fluctuates excessively due to minor illuminance variations
Solution Approach 1:
The system performs preliminary actions by measuring illuminance multiple times before making an adjustment decision. It accumulates measurement results and compares them against threshold values to determine whether environmental changes are significant enough to warrant brightness adjustment, preventing premature or unnecessary adjustments
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring illuminance changes and comparing current measurements with historical data. The control unit adjusts image brightness based on feedback from illuminance sensor readings, while also considering the stability of these readings over time to avoid oscillating adjustments
2Device complexity
If the illuminance sensor is disposed adjacent to operating buttons for compact design, then the device structure is more compact, but the illuminance measurement value fluctuates during operation causing image brightness instability
Solution Approach 1:
Before adjusting image brightness based on illuminance measurements, the system performs preliminary verification by checking whether the measurement values are stable and consistent across multiple measurements. This preliminary action distinguishes between genuine environmental illuminance changes and transient fluctuations caused by operational interference
Solution Approach 2:
The control unit acts as an intermediary between the illuminance sensor and the image brightness adjustment mechanism. It processes sensor readings through multiple measurement cycles and threshold comparisons, filtering out transient fluctuations caused by operational interference before transmitting adjustment commands
3Adaptability or versatility
If the image brightness is adjusted frequently in response to illuminance changes, then the image adapts to environmental conditions, but unnecessary adjustments occur during stable conditions causing visual discomfort
Solution Approach 1:
The system uses feedback from multiple illuminance measurements to determine whether adjustments are warranted. By comparing current measurements with historical data and evaluating stability thresholds, the feedback mechanism ensures adjustments are made only when genuine environmental changes occur, not during transient fluctuations
Solution Approach 2:
The system changes the parameter of measurement frequency and threshold sensitivity dynamically. During stable conditions, it requires more significant changes before triggering adjustments, while during transitional periods, it becomes more responsive. This adaptive parameter adjustment improves the reliability of brightness control
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
The device effectively displays a stable image by differentiating between stable and unstable illuminance conditions, reducing unnecessary brightness adjustments and maintaining appropriate image quality even when illuminance values change.
Implementation Method 1
an external light measurement unit that measures the illuminance of an external light a plurality of times
Data Source
AI summary
An image display device includes: an external light measurement unit measuring the illuminance of an external light a plurality of times, and generating a measurement value indicating the illuminance; a storage unit storing history data which shows the measurement values, and color mode data which shows a correspondence between the illuminance and a color mode; a determination unit, based on the history data, determining whether or not it is a changed condition wherein the illuminance changes upward or downward, or the illuminance fluctuates; and an adjustment unit, in the event that it is not the changed condition, determining the color mode to be applied based on the measurement values and the color mode data, and adjusting the color or brightness of an image in accordance with the color mode, and in the event that it is the changed condition, continuing the adjustment currently being applied as the image adjustment.