OLED Display Substrate Initialization Circuit Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED displays, the inconsistency between the anode and cathode voltages due to dynamic power supply signals leads to abnormal light emission, affecting display quality and reducing the effectiveness of OLED displays.
Innovation Solution
A display substrate design that includes a first initial signal line electrically connected to the first power supply line, ensuring equal voltage signals for the light-emitting element's electrodes during initialization, preventing light emission during initialization and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dynamic power supply signals are used to drive OLED, then the OLED can emit light, but voltage inconsistency between anode and cathode occurs leading to abnormal light emission
Solution Approach 1:
The patent applies preliminary action by introducing an initialization phase before normal OLED operation. During this phase, the anode is connected to the power supply line through a switch, pre-establishing equal voltage conditions at both electrodes before data writing begins. This preliminary voltage equalization prevents abnormal light emission during subsequent operations.
Solution Approach 2:
The patent implements equipotentiality by ensuring both the anode and cathode of the OLED are connected to the same power supply line during initialization. By making both electrodes equipotential (at the same voltage level) before operation begins, the patent eliminates voltage inconsistency that would otherwise cause abnormal light emission.
2Device complexity
If traditional signal line layout is used, then routing is simpler, but signal line length increases leading to greater signal loss and interference
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar signal line layout to a three-dimensional stacked architecture. The initialization signal line is routed through different layers (first signal line layer and second signal line layer) with corresponding via holes connecting them, effectively reducing the horizontal signal path length while maintaining routing simplicity through vertical connections.
Data Source
AI summary
A display substrate comprises: an AA and an AA′. The display substrate comprises: a base, and a VSS located in the AA′, a Gate, an Init1 and a plurality of display units located in the AA, disposed on the base. The display unite comprises: a driving structure layer and a light-emitting structure layer. The light-emitting structure layer comprises: a light-emitting element. The driving structure layer comprises a pixel driving circuit configured to drive the light-emitting element to emit light. The pixel driving circuit comprises: a reset sub-circuit. The reset sub-circuit is separately connected to the Gate, the Init1, and a first pole of the light-emitting element, and is configured to provide a signal of the Init1 to the first pole of the light-emitting element for initializing the first pole. A second pole of the light-emitting element is connected to the VSS. The Inti1 is electrically connected to the VSS.