LED Panel Test Apparatus Parallel Cell Quality Determination
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Solution Overview
Problem
Existing methods for testing the optical characteristics of LEDs, particularly micro LEDs, are inefficient as they require sequential measurement of each LED, leading to prolonged processing times and incorrect identification of defective LEDs due to interference from adjacent LEDs.
Innovation Solution
A test apparatus that collectively irradiates an LED panel with light and reads photoelectric signals from multiple cells simultaneously, using a substrate, electrical connection unit, light source, temperature control, reading unit, measuring unit, control unit, storage unit, and placement unit to determine the quality of each cell based on measured photoelectric signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential measurement of each LED is performed, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent combines multiple LED measurements into a single simultaneous measurement process. By applying a light source to multiple LEDs at once and reading photoelectric signals from all LEDs in parallel, the system achieves both high measurement precision and improved productivity, resolving the contradiction between sequential precision and parallel efficiency
2Measurement precision
If sequential measurement of each LED is performed, then interference from adjacent LEDs is avoided, but loss of time increases
Solution Approach 1:
The patent segments the measurement process by applying light sources and reading signals for different LED groups independently and simultaneously. This segmentation allows parallel processing of multiple LEDs without interference, as each LED group is measured in its own isolated measurement channel, eliminating interference while achieving parallel speed
3Productivity
If the number of cells measured is increased, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent employs universal light sources and universal signal reading circuits that can handle multiple LEDs simultaneously. The same basic measurement circuitry is reused across different LED groups through multiplexing, allowing the system to measure an increasing number of cells without proportionally increasing device complexity
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 approach significantly reduces processing time, accurately identifies defective cells, and allows for easy expansion of the number of cells measured, while avoiding interference from neighboring LEDs.
Implementation Method 1
optical characteristics of the LED are inspected using a current value of a current output by a photoelectric effect
Data Source
AI summary
A test apparatus includes: an electrical connection unit configured to be electrically connected to a light emitting device panel having a plurality of cells each including a light emitting device and arranged in a row direction and a column direction; a light source unit configured to collectively irradiate the plurality of cells with light; a reading unit configured to read, for each row of the light emitting device panel, a photoelectric signal obtained by photoelectrically converting the light in each of two or more of the cells arranged in the column direction by the light emitting device; a measuring unit configured to measure a photoelectric signal read from each of the plurality of cells; and a determination unit configured to determine a quality of each of the plurality of cells on a basis of a measurement result of the measuring unit.