GOA Gate Driving Circuit for OLED Threshold Compensation
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Solution Overview
Problem
The non-uniformity of threshold voltages (Vth) in OLED pixel units leads to reduced display uniformity over time, requiring effective Vth compensation, which is challenging for gate driving circuits to address, especially when using gate driver on array (GOA) technology to integrate OLED display panels cost-effectively.
Innovation Solution
A gate driving circuit comprising multiple GOA units with specific signal input and reset terminal connections, along with logic and inverse logic units, to provide matched gate driving signals for threshold compensation outside pixels, enabling simultaneous threshold compensation and gray scale display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold compensation outside pixels is implemented, then display uniformity is improved, but gate driving circuit complexity increases
Solution Approach 1:
The gate driving circuit is divided into multiple independent GOA units (first GOA unit, second GOA unit, third GOA unit, etc.), each responsible for driving specific pixel rows. This segmentation allows the circuit to provide matched gate driving signals for threshold compensation without requiring a completely complex peripheral circuit, as each unit operates semi-independently with standardized internal structure.
Solution Approach 2:
Each GOA unit is designed with multi-functionality to perform both normal display driving and threshold compensation operations. The units can output different gate driving signals (first gate driving signal, second gate driving signal, third gate driving signal) based on operational mode, eliminating the need for separate dedicated compensation circuits and reducing overall system complexity.
2Measurement precision
If matched gate driving signals are provided for threshold compensation, then compensation accuracy is improved, but circuit structure complexity increases
Solution Approach 1:
Different GOA units are configured with specific local characteristics to provide appropriately matched gate driving signals for different pixel rows. The first GOA unit connects its reset terminal to the third GOA unit's output, while the second GOA unit connects its reset terminal to the fourth GOA unit's output, creating localized signal matching that ensures compensation accuracy without requiring global circuit complexity.
Solution Approach 2:
Multiple GOA units are designed with identical or similar internal structures, copying the proven working architecture. This standardization allows for easy replication and scaling while maintaining consistent signal characteristics across different pixel rows, simplifying the overall circuit design process and reducing the complexity of ensuring signal matching.
3Productivity
If multiple GOA units are used for simultaneous threshold compensation and gray scale display, then productivity is improved, but device complexity increases
Solution Approach 1:
The multiple GOA units operate simultaneously and continuously to provide both threshold compensation signals and gray scale display signals without interruption. The first GOA unit provides first gate driving signals for compensation, while the second GOA unit provides second gate driving signals for display, enabling parallel operation that maintains high productivity without requiring complex sequential control mechanisms.
Data Source
AI summary
A gate driving circuit (12, 13), a display circuit, a driving method thereof and a display apparatus are provided. The gate driving circuit (12, 13) comprises at least three GOA units, each of which comprises a signal input terminal (INPUT), an output terminal (OUT), a reset terminal (RESET) and an idle output terminal (COUNT). The gate driving circuit, the display circuit and the driving method and the display apparatus are capable of providing a matched gate driving signal in the process of threshold compensation outside pixels and applicable to manufacture a displayer.