OLED Driving Circuit Demultiplexing for Narrow Frame Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED display panels face issues with uneven display and poor display effects due to insufficient scanning time for threshold compensation, particularly when attempting to achieve a narrow frame design, as the demultiplexing circuit's structure with multiple clock signal lines reduces the time available for threshold compensation.
Innovation Solution
The proposed driving circuit includes a pixel circuit and a demultiplexing circuit where the demultiplexing circuit writes data signals into the data line while the driving transistor performs threshold compensation, allowing the operating time of the threshold voltage compensation stage to overlap with the data signal charging stage, thereby increasing the time for sufficient threshold compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the demultiplexing circuit uses multiple clock signal lines to achieve narrow frame design, then the frame width is reduced, but the scanning time for threshold compensation is insufficient
Solution Approach 1:
The patent transitions from sequential time-domain execution to parallel space-domain execution by introducing a data writing module that operates independently during threshold compensation. This allows the demultiplexing circuit to write data signals while the driving transistor simultaneously performs threshold compensation, effectively adding a spatial dimension to the time-constrained operation and resolving the contradiction between narrow frame design and sufficient compensation time.
Solution Approach 2:
The data writing module is configured to write data signals into the data line in advance during the threshold compensation stage, so that the data signal is ready before the threshold compensation completes. This preliminary action ensures that both operations can proceed without waiting for each other, enabling the narrow frame design while maintaining adequate threshold compensation time.
2Reliability
If threshold compensation and data signal charging are performed sequentially, then each operation has sufficient time, but the total operating time increases
Solution Approach 1:
The patent merges the threshold compensation operation and the data signal charging operation into a parallel execution framework. The data writing module writes data signals into the data line simultaneously with the driving transistor performing threshold compensation. This merging of operations eliminates the sequential time penalty while ensuring both operations complete sufficiently, reducing total operating time without sacrificing reliability.
Solution Approach 2:
The patent ensures continuous useful action by configuring the data writing module to operate throughout the threshold compensation period. Instead of waiting for threshold compensation to finish before charging the data signal, the data writing module continuously writes data signals during the compensation process, maximizing utilization of the available time window and eliminating idle periods.
Data Source
AI summary
A driving circuit and a display panel are provided. The driving circuit includes a pixel circuit and a demultiplexing circuit. The pixel circuit includes a driving transistor, a light-emitting device, and a data writing module. The driving transistor is connected between a first power signal terminal and the light-emitting device in series, to generate a driving current. The data writing module is connected between the driving transistor and the demultiplexing circuit in series, to provide a data signal to the driving transistor. An output terminal of the demultiplexing circuit is connected to an input terminal of the data writing module through a data line. The demultiplexing circuit is configured to write the data signal to the data line when the driving transistor is performing threshold compensation.