OLED Pixel Driving Circuit Defect Detection via Luminosity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display products face challenges in identifying and diagnosing line defects due to complex circuit structures and varied defect causes, making rapid defect analysis and location difficult.
Innovation Solution
The implementation of an OLED pixel driving circuit with interlaced scanning and data lines, including defect detection units at endpoints, and an electrostatic discharge protection circuit with an organic light-emitting diode for defect detection, allowing for rapid identification of defects through luminosity checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex circuit structures (2T1C, 6T2C or more) are used in OLED display, then display performance is improved, but defect analysis difficulty increases
Solution Approach 1:
The patent divides the complex pixel circuit into functional modules and introduces separate defect detection units (first defect detection unit for scanning lines, second defect detection unit for data lines) that independently monitor specific circuit segments. This segmentation allows defects to be localized to specific lines or components without analyzing the entire complex circuit, thereby reducing analysis difficulty while maintaining display performance.
2Area of stationary object
If multiple scanning and data lines are used to achieve large-scale OLED display, then display area is improved, but defect identification time increases
Solution Approach 1:
The patent introduces defect detection units as intermediary components connected to scanning and data lines. These units act as mediators that directly detect defects on specific lines, eliminating the need for time-consuming manual analysis of large display areas. The detection units provide rapid feedback on line status, significantly reducing defect identification time across large-scale displays.
3Reliability
If electrostatic discharge protection circuit is added, then device reliability is improved, but circuit complexity increases
Solution Approach 1:
The patent merges the electrostatic discharge protection function with existing pixel circuit components rather than adding completely separate protection circuits. The defect detection units are integrated into the pixel circuit structure, serving dual purposes of defect detection and electrostatic protection, thereby improving reliability while minimizing increases in circuit 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
Enables efficient and rapid defect detection in OLED displays by using optical detection devices to determine luminous intensity, distinguishing normal and defective lines within a short detection time, thereby simplifying the analysis of line defects.
Implementation Method 1
The defect detection unit includes an organic light-emitting diode
Implementation Method 2
sending, by a data line, a detection signal to a defect detection unit corresponding to columns, where the defect detection unit includes an organic light-emitting diode
Data Source
AI summary
An OLED pixel driving circuit is disclosed. The pixel driving circuit includes a plurality of interlaced scanning and data lines, and a first defect detection unit electrically connected to a first endpoint of at least one of the scanning lines, and the data lines. The first endpoint is located at one end of the at least one scanning line or data line.