Display White Balance Correction via Dynamic Chromaticity Adjustment
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Solution Overview
Problem
LED-based backlights in display devices experience degradation over time, leading to a short duration for maintaining constant brightness, unlike cold-cathode tube-based systems, where initial white balance corrections are insufficient to ensure prolonged brightness.
Innovation Solution
A display device system that generates display chromaticity based on a degradation value, adjusting the video signal gain or drive value to align with the device's native white point chromaticity as the backlight degrades, thereby extending the duration for maintaining user-selected brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If initial white balance correction is applied to LED-based backlight, then chromaticity is adjusted at shipment, but brightness cannot be maintained for long time due to LED degradation
Solution Approach 1:
The patent implements dynamic chromaticity adjustment by continuously monitoring backlight degradation and adapting the display chromaticity in real-time. Unlike static initial correction, the system dynamically modifies the video signal gain to compensate for LED aging, transforming a fixed manufacturing adjustment into an adaptive operational process that extends brightness maintenance.
Solution Approach 2:
The system employs feedback mechanisms by monitoring the actual chromaticity drift caused by LED degradation and using this information to adjust the video signal gain. The correction value is calculated based on the difference between set chromaticity and actual device chromaticity, creating a closed-loop control system that automatically compensates for backlight aging effects.
2Reliability
If correction value is applied to maintain constant chromaticity difference, then initial brightness is optimized, but degradation compensation is insufficient for LED-based systems
Solution Approach 1:
The patent applies preliminary degradation compensation by pre-calculating correction values based on expected LED aging patterns. The system proactively adjusts the video signal gain before significant brightness degradation occurs, extending the operational life by anticipating and compensating for degradation rather than merely reacting to it.
Solution Approach 2:
The system changes the video signal gain parameter dynamically to compensate for backlight degradation. By adjusting this electrical parameter in response to measured chromaticity drift, the system maintains reliable color reproduction throughout the LED's operational life, effectively decoupling chromaticity stability from the finite lifespan of the light source.
3Measurement precision
If device chromaticity is kept constant, then initial color accuracy is achieved, but brightness degradation accelerates as backlight ages
Solution Approach 1:
The patent transforms the static device chromaticity into a dynamic parameter that evolves with backlight degradation. Instead of maintaining a fixed chromaticity point, the system allows device chromaticity to shift in a controlled manner while compensating through video signal adjustment, enabling long-term brightness maintenance without sacrificing initial color accuracy.
Data Source
AI summary
A display device includes: a generating unit that generates display chromaticity based on a degradation value, a set chromaticity and device chromaticity, the display chromaticity being chromaticity of a white point to be displayed on the display device, the degradation value indicating a degree of degradation of a backlight, the set chromaticity being chromaticity of a white point based on user setting, the device chromaticity being chromaticity of a white point at which brightness becomes highest in the display device. The generating unit makes the display chromaticity approach the device chromaticity from the set chromaticity, as the degree of degradation indicated by the degradation value increases.