OLED Driving Circuit Feedback Control for Brightness Uniformity
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Solution Overview
Problem
Display panels with organic light-emitting diodes (OLEDs) face issues with non-uniform brightness due to variations in transistor performance, which affect the uniformity of the display, and require complex compensation algorithms or circuits to address these deviations.
Innovation Solution
A driving circuit with a control circuit and pixel circuits that generate and monitor driving signals, ensuring the amplitudes of these signals are equal and proportional to the data signals, thereby stabilizing the brightness of OLEDs without the need for additional compensation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex compensation algorithms or circuits are used to address transistor performance variations, then display uniformity is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the pixel circuit monitors its own driving signal and adjusts subsequent signals based on detected variations. The pixel circuit generates a first driving signal, monitors it, and uses this information to adjust a second driving signal, creating a closed-loop system that compensates for transistor performance variations without external complex circuits
Solution Approach 2:
The pixel circuit performs self-compensation by autonomously monitoring its own driving signals and adjusting parameters to maintain uniformity. The circuit uses its internal resources to detect variations in driving signals and automatically corrects brightness non-uniformity, eliminating the need for external compensation circuits
2Reliability
If additional compensation circuits are added to address brightness non-uniformity, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the compensation function into the existing pixel circuit structure by integrating monitoring and adjustment capabilities within the same circuit that generates driving signals. This consolidation eliminates the need for separate compensation circuits, reducing manufacturing complexity while maintaining brightness uniformity
3Stability of the object's composition
If multiple signal terminals and monitoring circuits are added, then brightness stability is improved, but device complexity increases
Solution Approach 1:
The pixel circuit is designed to perform multiple functions: generating driving signals, monitoring signal amplitudes, detecting variations, and adjusting subsequent signals all within a single integrated circuit. This multi-functionality achieves brightness stability without requiring separate dedicated circuits for each function
Data Source
AI summary
A driving circuit includes at least one pixel circuit and a control circuit. A pixel circuit is configured to write a first data signal in response to a scan signal, and generate a first driving signal according to a first signal and the first data signal. The control circuit is configured to monitor the first driving signal and provide another first data signal to the pixel circuit according to a second data signal and the first driving signal. The pixel circuit is further configured to provide another first driving signal to a light-emitting device according to the first signal and the another first data signal, and in response to an enable signal of the enable signal terminal, provide a second driving signal to the light-emitting device according to a second signal and the another first data signal.