Light-Emitting Element Inspection Using Combined PL and EL Analysis
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Solution Overview
Problem
Existing display device manufacturing processes lack effective methods for inspecting light-emitting elements to assess reliability, degradation, and performance, particularly in terms of electrical and optical characteristics, which affects the quality and efficiency of the final product.
Innovation Solution
A method and apparatus that simultaneously acquire and synthesize electrical and optical information from light-emitting elements using a laser to induce photoluminescence and a driving signal to induce electroluminescence, allowing for comprehensive analysis of degradation and performance, including equivalent circuit analysis before and after an aging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only electrical information is acquired during inspection, then the inspection process is simple, but the reliability assessment and degradation analysis are insufficient
Solution Approach 1:
The patent combines electrical information acquisition (through electrical probes contacting the light-emitting element) and optical information acquisition (through laser irradiation and light detection) into a single integrated inspection process. Both types of information are measured simultaneously on the same sample under the same conditions, enabling comprehensive reliability assessment without requiring separate inspection procedures.
Solution Approach 2:
The inspection system is designed to perform multiple functions: it can measure electrical characteristics (current, voltage, resistance), optical characteristics (photoluminescence intensity, electroluminescence intensity), and degradation states. This multi-functional approach allows a single inspection apparatus to gather comprehensive data for reliability assessment, reducing the need for multiple specialized devices.
2Productivity
If separate inspection processes are used for electrical and optical characteristics, then each process can be optimized, but the overall inspection time increases and process efficiency decreases
Solution Approach 1:
The patent merges electrical measurement and optical measurement into a concurrent process where both types of data are collected during the same inspection cycle. The electrical probes and optical detection systems operate simultaneously on the light-emitting element, eliminating the need for sequential inspections and significantly reducing total inspection time.
Solution Approach 2:
The inspection process maintains continuous measurement of both electrical and optical characteristics throughout the inspection period. By keeping both measurement systems active and synchronized, the patent ensures that no useful data collection time is lost between separate inspection stages, maximizing productivity.
3Measurement precision
If degradation analysis is performed without synthesizing electrical and optical information, then the analysis process is simpler, but the accuracy and reliability of degradation detection are reduced
Solution Approach 1:
The patent synthesizes electrical information (such as current-voltage characteristics and resistance changes) with optical information (such as photoluminescence and electroluminescence intensity variations) to create a comprehensive degradation profile. By correlating changes in both electrical and optical parameters, the system achieves more accurate degradation detection than either measurement type could provide alone.
Solution Approach 2:
The inspection system uses feedback from both electrical and optical measurements to continuously refine degradation assessment. Changes in electrical characteristics provide feedback on material degradation, while optical measurements provide complementary feedback on light emission quality. The synthesis of both feedback streams enables more precise identification and characterization of degradation mechanisms.
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 enhances the reliability of light-emitting elements by clearly detecting degradation positions, improving analysis results, and increasing process efficiency through thorough and quantitative evaluation of electrical and optical characteristics.
Implementation Method 1
applying a laser to the light-emitting element sample to cause the light-emitting element sample to emit photoluminescence (PL) light
Implementation Method 2
applying a driving signal to the light-emitting element sample to acquire the electrical information of the light-emitting element sample and cause the light-emitting element sample to emit electroluminescence (EL) light
Data Source
AI summary
A method of inspecting a light-emitting element sample, an apparatus for inspecting a light-emitting element sample, a method of manufacturing a display device, and an electronic device comprising a display device are provided. The method of inspecting the light-emitting element sample includes: acquiring electrical information and optical information on the light-emitting element sample; and analyzing the light-emitting element sample by synthesizing the electrical information and the optical information.