Display Driving Device Illuminance Weighting for Gray Scale Clarity
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Solution Overview
Problem
Display devices face challenges in maintaining clear image quality when gray scale discrimination capability is lowered or lost due to external lighting or sunlight, leading to defects from data exceeding expression limits.
Innovation Solution
A display driving device that calculates external illuminance using a measurement device, accumulates and stores it by time zone, determines weights based on this data, and adjusts image processing to generate output data, identifying target panels to prevent defects and ensure clear image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices operate under external lighting or sunlight conditions, then the display can be viewed in various environments, but gray scale discrimination capability is lowered or lost
Solution Approach 1:
The system performs preliminary actions by calculating external illuminance in advance and accumulating it by time zones before image display. This pre-calculated illuminance data is stored and used to determine weights that are applied to output data, preparing the display system proactively for varying lighting conditions rather than reacting after gray scale discrimination is already compromised
Solution Approach 2:
The system changes parameters by dynamically adjusting weights based on calculated external illuminance levels. When external lighting conditions change, the system modifies the weight applied to output data, and selectively activates or deactivates display panels. This parameter adjustment compensates for the degraded gray scale discrimination capability under external lighting, maintaining image quality across different environmental conditions
2Measurement precision
If weight is applied to output data to compensate for external illuminance, then image quality is maintained, but data may exceed expression limit values causing defects
Solution Approach 1:
The system implements feedback by calculating external illuminance, applying weights to output data, and then determining whether the weighted data exceeds expression limit values. Based on this feedback, the system selectively activates or deactivates display panels to ensure that only data within valid expression ranges is displayed, preventing defects while maintaining image quality
Solution Approach 2:
The system applies local quality by selectively activating or deactivating specific display panels based on whether the weighted output data for those panels exceeds expression limit values. Instead of uniformly processing all panels, the system individually evaluates and adjusts each panel's activation state, ensuring that local defects are prevented while maintaining overall image quality in regions where data remains within valid ranges
3Measurement precision
If external illuminance is calculated using measured illuminance, then accurate environmental lighting data is obtained, but reliability is reduced when measurement accuracy is low
Solution Approach 1:
The system performs preliminary action by accumulating external illuminance data over time zones before using it for weight determination. This historical accumulation provides a more reliable basis for calculating current illuminance conditions, reducing the impact of temporary measurement inaccuracies and improving the overall reliability of the illuminance data used for image processing
Data Source
AI summary
A display driving device configured to drive a plurality of display panels includes an external illuminance calculation unit configured to calculate external illuminance using measured illuminance input from an illuminance measurement device, and accumulate and store the external illuminance according to a time zone, a weight determination unit configured to determine a weight according to the calculated external illuminance, an image processing unit configured to apply the weight to first output data to generate second output data, and a target panel determination unit configured to determine target panels that are display panels for displaying an image, among the plurality of display panels, using the second output data.