OLED Display Drive Transistor Detection and Compensation
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Solution Overview
Problem
Existing OLED display devices face luminance non-uniformities due to shifts in threshold voltage and mobility of drive transistors over time, requiring compensation during operation.
Innovation Solution
The OLED display device incorporates a configuration with subpixels arranged in an array, including control and drive transistors, detection lines, and group detection control lines, allowing for detection and compensation of drive transistor properties across multiple rows, reducing the number of control lines and optimizing layout space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection lines are electrically connected with control transistors of subpixels in the same column to detect drive transistor properties, then measurement precision is improved, but device complexity increases due to the large number of control lines required
Solution Approach 1:
The patent merges multiple control lines into group detection control lines that can control multiple detection lines simultaneously. Specifically, control transistors in the same row are grouped together and controlled by a single group detection control line, reducing the total number of control lines while maintaining the ability to detect drive transistor properties across all subpixels in that row.
Solution Approach 2:
The patent segments the detection process into row-based groups rather than requiring individual control for each subpixel. By dividing the display panel into rows and assigning one group detection control line per row, the system achieves segmented control that reduces overall complexity while preserving measurement capabilities.
2Device complexity
If the number of control lines is reduced through grouping, then device complexity is decreased, but ease of operation worsens due to reduced control flexibility
Solution Approach 1:
The group detection control lines serve multiple functions: they can control all detection lines simultaneously for row-wide detection, or work in conjunction with column-specific detection lines for more targeted detection. This multi-functionality maintains operational flexibility despite the reduced number of control lines.
Solution Approach 2:
The system dynamically activates specific group detection control lines based on detection needs. Rather than having fixed individual control for each subpixel, the system can selectively activate rows or combinations of rows, providing dynamic control flexibility that adapts to different detection scenarios while using fewer physical control lines.
Data Source
AI summary
The present disclosure provides an organic light emitting diode (OLED) display device and control method thereof. The OLED display device includes: a plurality of subpixels that are arranged in an array having a plurality of rows and a plurality of columns, wherein at least one of the subpixels comprises a control transistor, a light emitting element, and a drive transistor for driving the light emitting element; a plurality of detection lines, wherein at least one of the detection lines is electrically connected with the control transistors of subpixels in a same column, for detecting an electrical property of the drive transistors of subpixels in the same column through respective control transistors; and a plurality of group detection control lines, wherein at least one of the group detection control lines is electrically connected with control transistors of a subpixel group, the subpixel group comprising subpixels in a first row and subpixels in a second row.