Backlight Unit LED Interspersion for Luminance Uniformity
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Solution Overview
Problem
Existing LED backlight units for LCD devices often exhibit variability in luminance and color rank chromaticity coordinates, leading to non-uniform color representation across different devices.
Innovation Solution
A backlight unit is designed with multiple groups of LEDs having different luminances and color ranks, which are interspersed or combined to achieve average luminance and color rank values that are consistent with predetermined targets, ensuring uniform color representation across LCD devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple batches of LEDs with different luminances and color ranks are used, then the backlight unit can achieve target average luminance and color rank values, but variability in luminance and color rank occurs across different backlight units
Solution Approach 1:
The patent applies parameter changes by deliberately selecting LEDs with different luminance and color rank parameters from multiple batches. By controlling the distribution of these parameters across different LED groups, the invention achieves target average values while maintaining consistency across backlight units. This involves adjusting the mix of LED batches to reach predetermined target values for average luminance and color rank.
Solution Approach 2:
The patent merges multiple groups of LEDs with different characteristics (luminance and color rank) into a single backlight unit. By combining these diverse LED groups in specific proportions and arrangements, the invention achieves the desired average performance metrics. The merging of different LED batches allows the system to reach target average luminance and color rank values that would be difficult to achieve with a single batch.
2Adaptability or versatility
If LEDs from different batches are used to achieve target average luminance and color rank, then manufacturing flexibility increases, but color representation uniformity across devices deteriorates
Solution Approach 1:
The patent utilizes parameter changes by selecting LEDs with varying luminance and color rank parameters from different batches. By controlling the distribution and mixing ratios of these parameter variations, the invention achieves target average values while ensuring consistency across manufactured devices. This approach allows manufacturing flexibility in selecting different LED batches while maintaining uniform color representation through controlled parameter distribution.
Solution Approach 2:
The patent implements feedback mechanisms to monitor and control the luminance and color rank parameters of LEDs from different batches. By measuring the actual parameters of selected LEDs and adjusting the mixing composition accordingly, the system ensures that target average values are achieved and color representation uniformity is maintained across different devices. This feedback control compensates for batch-to-batch variations.
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 solution ensures that LCD devices receive light with consistent average luminance and color rank, maintaining high image quality by minimizing variability in backlight units, thereby improving color uniformity and representation.
Implementation Method 1
a first plurality of light emitting diodes having a first luminance and a second plurality of light emitting diodes having a second luminance
Data Source
AI summary
A backlight for a liquid crystal display device includes a first plurality of light emitting diodes having a first luminance and a second plurality of light emitting diodes having a second luminance, wherein at least the first and second plurality of light emitting diodes are interspersed with each other to provide an average luminance at or substantially near a predetermined target value of luminance that is consistent across the liquid crystal display device.