LED Array Placement Angles for Uniform Light Intensity
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Solution Overview
Problem
When an LED element fails in an LED array, the emission of light from other LED elements in the same column stops, leading to non-uniform light intensity distribution on the irradiated surface, which existing technologies do not address effectively.
Innovation Solution
A light source device with an LED array where LED chips are placed at different angles within the same column, ensuring that even if one LED chip fails, the emission of light from other chips in the same column continues, maintaining uniform light intensity distribution by using a substrate circuit with multiple LED chips placed at distinct angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED elements are placed in the same column with the same placement angle to simplify the circuit structure, then device complexity is reduced, but reliability deteriorates because a single failure stops light emission from the entire column
Solution Approach 1:
The LED array is segmented into multiple independent columns, where each column contains LED elements with the same placement angle. This segmentation ensures that a failure in one column does not affect other columns, thereby improving reliability while maintaining circuit simplicity within each column.
Solution Approach 2:
Different columns are designed with different placement angles for LED elements (e.g., first column with angle α, second column with angle β). This local differentiation in placement angles ensures that even if one column fails, other columns with different angles continue to provide light emission, resolving the reliability issue.
2Reliability
If LED elements are placed at different angles in the same column to improve reliability, then reliability is improved, but device complexity increases due to the need for more complex circuit control
Solution Approach 1:
The array is segmented into multiple columns, each with LEDs of the same placement angle. This allows independent control of each column, simplifying the circuit logic compared to controlling individually angled LEDs within a single column, while still achieving reliability through column-level redundancy.
Solution Approach 2:
The patent employs periodic scanning or sequential activation of different columns to maintain uniform light output. When one column fails, the control circuit can periodically activate other columns with different placement angles to compensate, maintaining reliability without requiring complex real-time adjustment circuits.
3Device complexity
If a single column of LED elements is used to reduce device complexity, then device complexity is reduced, but uniformity of light intensity distribution deteriorates when failures occur
Solution Approach 1:
The LED array is divided into multiple columns with different placement angles. This segmentation ensures that the failure of one column does not create significant non-uniformity in the overall light distribution, as other columns with different angles continue to contribute to the uniform light output.
Solution Approach 2:
The placement angle is varied across different columns (e.g., α, β, γ angles). This parameter change in placement angles across columns ensures that the light intensity distribution remains stable and uniform even when some columns fail, as the different angles provide complementary light distribution patterns.
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 the light intensity distribution remains uniform on the irradiated surface, even if a failure occurs in one LED chip, by differentiating the placement angles of LED chips, thereby maintaining the overall light output and reducing the impact of individual LED chip failures.
Implementation Method 1
a light source device includes a light-emitting diode (LED) array including a circuit having a substrate, a plurality of LED chips on the substrate
Implementation Method 2
the plurality of LED chips including first LED chips and second LED chips different from the first LED chips placed in a same column of the circuit
Data Source
AI summary
To uniformize the light intensity distribution on an irradiated surface in a light source device including a light-emitting diode (LED) array, a light source device includes a light-emitting diode (LED) array including a circuit having a substrate, a plurality of LED chips on the substrate, and a power supply. A predetermined plane is illuminated with light from the LED array. The plurality of LED chips includes first LED chips and second LED chips different from the first LED chips placed in a same column of the circuit, and the first LED chips have a placement angle different from a placement angle of the second LED chips.