Gate Driving Circuit Synchronization Transistor for Display Timing
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Solution Overview
Problem
Conventional self-luminous displays face image quality deterioration due to luminance deviations between subpixels caused by variations in the on-off performance and emission timing of light emitting transistors, despite compensation efforts.
Innovation Solution
A display device and gate driving circuit that improve the rising and falling characteristics of light emission signals, synchronizing these signals with scan signals to enhance threshold voltage compensation and data input timing, thereby reducing luminance deviations and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If light emitting transistors are used to control emission timing, then light emission control is achieved, but on-off performance deviation causes luminance inconsistency
Solution Approach 1:
A synchronization transistor is introduced as an intermediary component between the light emitting transistor and the scan signal line. This synchronization transistor acts as a mediator that transfers the scan signal to the light emitting transistor at precisely controlled timing, eliminating the need for the light emitting transistor to directly respond to scan signals. This resolves the contradiction by maintaining operational control while ensuring consistent luminance output across all subpixels.
Solution Approach 2:
The synchronization transistor is configured to transfer the scan signal to the light emitting transistor in advance of the actual emission period. By performing the signal transfer beforehand, the system ensures that the light emitting transistor is properly activated at the correct timing, preventing luminance deviation caused by timing errors in the on-off performance of light emitting transistors.
2Device complexity
If conventional gate driving is used, then circuit simplicity is maintained, but rising and falling characteristics of light emission signals are insufficient
Solution Approach 1:
The gate driving function is segmented into two distinct components: the conventional scan signal line for general scanning operations, and the synchronization transistor for precise light emission signal generation. This segmentation allows the light emission signal to have optimized rising and falling characteristics through the synchronization transistor while the rest of the circuit maintains its simple structure.
Solution Approach 2:
The synchronization transistor is strategically placed at the local position where light emission signal quality is critical. By concentrating the signal optimization function in this specific local component, the patent improves the rising and falling characteristics of light emission signals without requiring complex modifications throughout the entire circuit.
3Ease of manufacture
If light emitting transistor on-off performance varies, then manufacturing tolerances are accommodated, but threshold voltage compensation becomes ineffective
Solution Approach 1:
The synchronization transistor serves as a mediator that decouples the threshold voltage compensation mechanism from the light emitting transistor's on-off performance variations. By introducing this intermediate component, the system can accurately measure and compensate for threshold voltage deviations without being affected by the inherent manufacturing variations in light emitting transistor characteristics.
Data Source
AI summary
One or more embodiments of the present disclosure relate to a display device and a gate driving circuit. There is further provided with a synchronization transistor controlled according to a voltage of a Q node of a m-th scan driver (e.g., a second scan driver) and controlling an electrical connection between an output terminal of the n-th light emitting driver and a clock input terminal of the m-th scan driver, so that the rising characteristic and/or the falling characteristic of the light emission signal which is a type of the gate signal can be improved, thereby improving a threshold voltage compensation performance of the driving transistor and the image quality.