Vehicle Lamp Current Sequencing to Suppress Light Color Discoloration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lighting apparatuses using semiconductor light emitting elements can experience discoloration of emitted light due to fluctuations in idle current, leading to undesirable color tone changes.
Innovation Solution
A lighting apparatus with multiple light emitting elements of different colors, controlled by a power supply circuit and control circuit to manage current flow, where one element is non-conductive during one period and another element emits a complementary color during a subsequent period to correct the color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If idle current flows through semiconductor light emitting elements to maintain operation, then the light emitting elements remain conductive and functional, but emission color fluctuates and discoloration occurs
Solution Approach 1:
The patent applies periodic action by alternately switching between first and second light emitting elements with different emission colors. During first periods, the first light emitting element operates while the second is non-conductive; during second periods, the second light emitting element operates while the first is non-conductive. This periodic switching maintains overall light output while preventing color discoloration that would occur from continuous idle current flow through a single element type.
2Stability of the object's composition
If multiple light emitting elements with different emission colors are used, then color tone can be corrected and discoloration suppressed, but device complexity increases
Solution Approach 1:
The patent segments the light emitting element population into at least two distinct groups: first light emitting elements with a first emission color and second light emitting elements with a second emission color. The control circuit segments the operation into first periods and second periods, activating different element groups during different periods. This segmentation enables color tone correction while managing complexity through structured, periodic 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 solution effectively suppresses discoloration of emitted light by maintaining consistent color tone through controlled current management, ensuring stable light emission.
Implementation Method 1
a power supply circuit connected to the first light emitting element and the second light emitting element and supplies a driving voltage to the first light emitting element and the second light emitting element
Data Source
AI summary
To suppress discoloration of color tone of the emitted light in a lighting apparatus using a light emitting element.The lighting apparatus includes: a first light emitting element; a second light emitting element whose emission color is different from that of the first light emitting element;a power supply circuit connected to and supplies a driving voltage to the light emitting elements; and a control circuit configured to control flow of a current generated by the drive voltage to each light emitting element, and to control the flow of the current such that, during a first period, a first current flows through the first light emitting element while the second light emitting element is in a non-conductive state, and during a second period, a second current smaller than the first current flows through the first light emitting element while a third current flows through the second light emitting element.