Light Source Apparatus Dynamic Sampling Control
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Solution Overview
Problem
Current light source apparatuses for image display devices struggle to consistently produce light with desired chromaticity and luminance, particularly when using solid light sources like LEDs or LDs, due to variations in temperature coefficients and individual differences among light emitting elements.
Innovation Solution
A light source apparatus comprising multiple light source units, a sensor unit, and an interval control unit that samples and adjusts the sampling intervals based on output characteristics to achieve desired chromaticity and luminance, with a drive unit applying drive currents to each light source unit to maintain optimal light ratios and intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common sampling system is used for multiple light source units, then device complexity is reduced, but measurement precision deteriorates due to individual differences among light emitting elements
Solution Approach 1:
The patent divides the sampling system into separate sampling circuits for each light source unit. Each sampling circuit independently samples the light intensity from its corresponding light source unit, eliminating the problems caused by individual differences among light emitting elements while maintaining manageable system complexity through modular design.
2Use of energy by moving object
If sampling interval is increased to reduce power consumption, then energy efficiency improves, but control precision deteriorates due to variations in temperature coefficients
Solution Approach 1:
The patent implements dynamic sampling interval adjustment where the sampling frequency is adaptively changed based on the drive current level. When drive current is high (greater than threshold), sampling is performed at a first frequency to ensure precise chromaticity control. When drive current is low (less than threshold), sampling frequency is reduced to save power, thereby optimizing both power consumption and control precision under different operating conditions.
3Measurement precision
If multiple separate sampling circuits are used for each light source unit, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent employs a common photoelectric conversion element that serves multiple functions: it sequentially detects light intensities from different light source units and provides feedback signals for controlling each unit. This multi-functional approach achieves precise measurement for each light source while avoiding the complexity of having completely separate sampling circuits for each unit.
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
This solution enables precise control over the chromaticity and luminance of emitted light, ensuring high-quality image display even with eccentric optical systems, without the need for mechanical diaphragms, thus reducing costs and power consumption.
Implementation Method 1
a sensor unit, capable of receiving a plurality of emitted light beams from the plurality of light source units and sampling intensities of the emitted light beams
Data Source
AI summary
A light source apparatus includes a plurality of light source units, a sensor unit, and an interval control unit. The sensor unit is capable of receiving a plurality of emitted light beams from the plurality of light source units and sampling intensities of the emitted light beams at a predetermined sampling interval. The interval control unit is capable of controlling the predetermined sampling interval on the basis of an output characteristic relating to each of the emitted light beams from the plurality of light source units.