Organic Light Emitting Display Defect Detection Circuit
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in efficiently detecting defects in pixels during the manufacturing process, particularly in distinguishing between normal operation and test modes, which affects the reliability and efficiency of defect detection.
Innovation Solution
The implementation of a simultaneous emission-type organic light emitting display device that includes a pixel unit with a first scan driving unit for sequential test signal application and a second scan driving unit for simultaneous test signal application across multiple scan lines, utilizing switching devices connected to control lines to detect defects and enable normal operation, allowing for both test and normal driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scan driving unit is used for sequential scanning, then the circuit structure is simple, but the defect detection capability is insufficient
Solution Approach 1:
The scan driving unit is divided into two independent units: a first scan driving unit for sequential scanning and a second scan driving unit for simultaneous scanning. Each unit operates independently to perform different scanning functions, thereby enhancing defect detection capability without requiring complete redesign of the entire scanning system.
Solution Approach 2:
The dual scan driving units enable the display device to perform multiple functions: normal sequential scanning for display operation and simultaneous scanning for defect detection. The system can switch between these modes as needed, making the scanning system universally applicable to both operational and testing scenarios.
2Reliability
If sequential scanning is used for normal operation, then the display operation is stable, but the defect detection efficiency is low
Solution Approach 1:
The system dynamically switches between sequential scanning mode for normal display operation and simultaneous scanning mode for defect detection. This dynamic operation allows the system to optimize performance for the current task while maintaining stability during normal operation and efficiency during testing.
Solution Approach 2:
The second scan driving unit is prepared in advance to perform simultaneous scanning for defect detection without interfering with the normal sequential operation. This preliminary preparation ensures that defect detection can be performed efficiently when needed, without compromising display stability during normal operation.
3Measurement precision
If simultaneous emission is implemented, then the defect detection ratio is improved, but the circuit control complexity increases
Solution Approach 1:
The control functions are segmented between two independent scan driving units, each responsible for a specific scanning mode. This segmentation simplifies the control logic for each unit while achieving the overall goal of simultaneous emission for enhanced defect detection, as each unit handles its own control signals independently.
Solution Approach 2:
The second scan driving unit acts as an intermediary that enables simultaneous scanning without disrupting the normal sequential operation. It mediates between the display operation requirements and the defect detection requirements, allowing both functions to coexist with manageable control complexity.
Data Source
AI summary
An organic light emitting display device includes a pixel unit including a plurality of pixels formed in regions where a plurality of scan lines and a plurality of data lines cross each other, a first scan driving unit detecting a defect of the plurality of pixels by sequentially applying a first test signal to the plurality of scan lines, and a second scan driving unit detecting a defect of the plurality of pixels by simultaneously applying a second test signal to the plurality of scan lines.