Circular LED Array with Diffuser for Uniform Illumination
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Solution Overview
Problem
The high cost of large integration spheres used for calibrating display panel images due to their high manufacturing costs, which increases investment in image processing systems for detecting display unevenness, and the issue of non-uniform light emission leading to incorrect inspection results.
Innovation Solution
A light-emitting apparatus with multiple light-emitting elements arranged at equal intervals on a circumference and a milky white emission window with a specific radius and separation distance ratio, ensuring uniform light emission and reducing manufacturing costs, along with a calibration coefficient calculation method using a camera to correct sensitivity variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large integration sphere is used to obtain uniform light emission, then the uniformity of luminance distribution improves, but the manufacturing cost increases
Solution Approach 1:
The patent divides the light source into multiple discrete light-emitting elements (LEDs) arranged in a circular pattern around the emission window, replacing the single integrated light source of a traditional integration sphere. This segmentation allows uniform light emission to be achieved through geometric arrangement rather than requiring a large sphere volume, thereby reducing manufacturing cost while maintaining luminance uniformity.
Solution Approach 2:
The patent transitions from a three-dimensional spherical geometry to a two-dimensional circular arrangement of light-emitting elements around the emission window. By arranging LEDs in a circle at a specific radius distance from the emission window center, the system achieves uniform light distribution through planar geometric optimization rather than volumetric integration, reducing the overall size and cost of the apparatus.
2Ease of manufacture
If multiple light-emitting elements are arranged in a circular pattern, then the manufacturing cost decreases, but the uniformity of light emission may deteriorate
Solution Approach 1:
The patent optimizes specific geometric parameters of the circular arrangement, including the radius distance from the emission window center to the light-emitting elements, the angular spacing between adjacent LEDs, and the emission window diameter. By carefully selecting these parameters, the system achieves uniform light distribution through mathematical optimization of the circular geometry, ensuring that cost-effective discrete LED arrangements produce uniform luminance without requiring complex additional components.
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 provides a cost-effective method for achieving high uniformity in light emission, allowing for accurate calibration coefficients to be created, thereby ensuring correct inspection results without display unevenness in captured images.
Implementation Method 1
a milky white-colored emission window that is provided on a top surface portion located away from the light-emitting elements, has an outer edge smaller than the circumference on which the light-emitting elements are arranged, and allows light of the light-emitting elements to pass therethrough
Data Source
AI summary
Provided are a light-emitting apparatus that can suppress manufacturing cost to a low level and perform light emission with high uniformity using a simple configuration, a calibration coefficient calculation method using the light-emitting apparatus, and a method for calibrating a captured image of an inspection target object. A plurality of light-emitting diodes arranged at equal intervals on the circumference of a virtual circle, and a milky white-colored emission window, which is provided on a top surface portion separated from the light-emitting diodes, has an outer edge that is smaller than the circumference on which the light-emitting diodes are arranged, and allows light of the light-emitting diodes to pass therethrough, are included. The diameter of the virtual circle on which the light-emitting diodes are arranged and a separation distance between the light-emitting diodes and the emission window are set to predetermined distances.