Transparent Chuck Light Concentration for LED Chip Detection
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Solution Overview
Problem
The limited detection range of light-sensing devices in existing probe detectors for light-emitting diode (LED) chips leads to inefficient light absorption and inaccurate measurement of LED efficiency.
Innovation Solution
A detection apparatus featuring a transparent chuck with light-concentration capabilities, including a light-incident plane and a light-emitting plane with micro-structures or a convergent lens, and a light guide device, which focuses and directs the emitted light beams to enhance light collection by the light-sensing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional probe detector with a light-sensing device is used to detect LED chips, then the detection structure is simple, but the light collection efficiency is low due to limited detection range
Solution Approach 1:
A transparent chuck with light-concentration capability is introduced as an intermediary component between the LED chip and the light-sensing device. The chuck includes a light-incident plane for receiving light from the LED chip and a light-emitting plane with micro-structures (prisms, curved surfaces, or convex shapes) that concentrate and redirect light toward the sensor, thereby improving light collection efficiency without significantly complicating the overall detection structure
Solution Approach 2:
The patent transforms the light detection problem from a two-dimensional planar interaction to a three-dimensional optical path manipulation by incorporating micro-structures on the light-emitting plane of the chuck. These structures (prisms, curved surfaces, or convex shapes) create additional optical dimensions for light redirection and concentration, enabling the light-sensing device to capture more light from various angles
2Measurement precision
If the light-sensing device is placed close to the LED chip for efficient light detection, then the light collection efficiency improves, but the detection range is limited and measurement accuracy decreases
Solution Approach 1:
The light-emitting plane of the transparent chuck incorporates curved surface structures (such as convex shapes, arcs, or spherical segments) that refract and concentrate light from the LED chip toward the light-sensing device. These curved structures expand the effective detection range by redirecting light rays that would otherwise miss the sensor, thereby improving both detection accuracy and the angular acceptance range without requiring the sensor to be placed extremely close to the chip
3Measurement precision
If the area of the light-emitting plane is made smaller to concentrate light, then the light-concentration capability improves, but the structural design becomes more complex
Solution Approach 1:
The light-emitting plane of the transparent chuck is segmented into multiple micro-structural units (such as arrays of small prisms, curved segments, or convex elements). Each segment independently contributes to light concentration, and their collective effect achieves high light-concentration capability. This segmentation approach allows for modular manufacturing and reduces overall structural complexity compared to a single large complex structure
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 apparatus effectively increases the light collection efficiency of the light-sensing device, enabling accurate detection of the light-emitting efficiency of LED chips by concentrating the emitted light beams.
Implementation Method 1
The light-emitting plane of the transparent chuck comprises a plurality of micro-structures which are prisms. Each prism comprises a first inclined surface and a second inclined surface, and the first inclined surface and the second inclined surface jointly form a vertex angle.
Implementation Method 2
The light-emitting plane of the transparent chuck comprises a plurality of micro-structures, wherein each micro-structure comprises a curved surface.
Implementation Method 3
The internal of the transparent chuck comprises a storage space in which a convergent lens is installed such that the transparent chuck can concentrate light.
Implementation Method 4
The internal of the transparent chuck comprises a storage space in which a light guide device is installed to guide the plurality of light beams which emitted into the transparent chuck. The light guide device is a light guide pillar or a light guide panel.
Data Source
AI summary
A detection apparatus for light-emitting diode chips comprises a transparent chuck with the light-concentration capability, a probing device and a light-sensing device. The transparent chuck comprises a light-incident plane and a light-emitting plane. The light-incident plane is used to bear a plurality of light-emitting diode chips under detection. The probing device comprises two probe pins and a power supply. The two ends of each probe pin is electrically connected to one of the light-emitting diode chips and the power supply, respectively, to make the light-emitting diode chip emit a plurality of light beams. The light beams penetrate through the transparent chuck by emitting into the incident plane of the transparent chuck. The light-sensing device is disposed on one side of the light-emitting plane of the transparent chuck to receive the light beams which penetrate through the transparent chuck.