Display Driving Circuit Threshold Voltage Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED display panels face issues of non-uniformity and afterimage due to the non-uniformity and instability of driving transistors, which are not effectively addressed by existing display driving circuits.
Innovation Solution
A display driving circuit comprising a storage circuit, reset circuit, data writing circuit, compensation circuit, and light-emitting control circuits that utilize scan signals to reset and compensate the driving transistor threshold voltage, allowing the light-emitting circuit to operate independently of the transistor's threshold voltage, thereby reducing display non-uniformity and afterimage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display driving circuit is used, then the structure is simple, but the display non-uniformity and afterimage caused by transistor threshold voltage drift cannot be effectively compensated
Solution Approach 1:
The driving circuit is segmented into multiple functional modules: reset circuit, data writing circuit, compensation circuit, and light-emitting control circuit. Each module performs a specific function in the threshold voltage compensation process, allowing systematic addressing of the non-uniformity problem while maintaining modular simplicity.
Solution Approach 2:
The circuit performs preliminary actions before the light-emitting stage by first resetting the storage circuit, then writing data line voltage, and finally compensating the threshold voltage. This sequence of preliminary actions ensures the transistor is properly prepared and calibrated before actual light emission, preventing display non-uniformity.
2Length of stationary object
If the light-emitting control circuit is integrated into the GOA circuit, then the device complexity is reduced, but the bezel width cannot be narrowed
Solution Approach 1:
The light-emitting control circuit is extracted from the traditional GOA circuit integration and positioned as a separate module within the pixel circuit. This extraction allows the GOA circuit to be minimized or eliminated, enabling narrower bezel design while the light-emitting control circuit independently manages the light emission timing and intensity.
3Reliability
If the driving transistor threshold voltage is not compensated, then the circuit structure remains simple, but display non-uniformity and afterimage occur
Solution Approach 1:
The compensation circuit implements feedback by continuously monitoring the storage circuit voltage and adjusting the threshold voltage compensation accordingly. The data writing circuit writes data line voltage to the storage circuit based on feedback from the driving transistor's actual operation, creating a closed-loop system that maintains display uniformity.
Data Source
AI summary
A display driving circuit includes a driving transistor, a storage circuit, a first reset circuit, a data writing circuit, a compensation circuit and a light-emitting control circuit. The first and second light-emitting control circuits, the driving transistor and the display light-emitting circuit are connected in sequence. The storage circuit is connected to a control terminal of the driving transistor and power supply high voltage terminal, the first reset circuit is connected to the control terminal of the driving transistor, the data writing circuit is connected to a first terminal of the driving transistor, the compensation circuit is connected to the control terminal and a second terminal of the driving transistor, the first and second light-emitting control circuits are used to switch on the power supply high voltage terminal and the display light-emitting circuit in response to first and second scan signals.