Pixel Circuit Driving Stage Segmentation for Display Uniformity
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Solution Overview
Problem
The duration of the displaying stage in existing display technologies is too short, affecting the uniformity and efficiency of light emission in display devices, particularly due to the lengthy threshold compensation process which dominates the driving stage duration.
Innovation Solution
A pixel circuit design that separates the process into a reset stage, a compensation stage, and a driving stage, where the threshold compensation and data writing processes are performed in dedicated stages, allowing the driving stage to be shortened and the displaying stage to be extended, thereby improving light emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threshold compensation process is performed during the driving stage, then the driving transistor threshold voltage variations are corrected, but the driving stage duration becomes too long
Solution Approach 1:
The patent divides the driving stage into two separate stages: a compensation stage for threshold voltage compensation and a driving stage for actual light emission. By segmenting the originally combined process, the compensation operations are isolated from the driving operations, allowing the driving stage to be shortened while ensuring threshold compensation is completed in the dedicated compensation stage before driving begins.
2Duration of action of moving object
If driving stage duration is shortened, then displaying stage duration can be extended, but threshold compensation may be insufficient
Solution Approach 1:
The patent performs threshold compensation in advance during a dedicated compensation stage that occurs before the driving stage. By completing the threshold compensation operation preliminarily, the driving transistor is properly conditioned before the actual driving and light emission begin, ensuring adequate compensation without extending the driving stage duration.
3Productivity
If threshold compensation and data writing are performed simultaneously, then process efficiency improves, but control complexity increases
Solution Approach 1:
The patent segments the simultaneous operations of threshold compensation and data writing into sequential stages: first the compensation stage for threshold compensation, then the driving stage for data writing and light emission. This temporal segmentation simplifies control signal design compared to simultaneous operations, while maintaining high productivity through efficient stage transitions and overlapping operations in the display pipeline.
Data Source
AI summary
The present disclosure provides a pixel circuit including: a reset circuit, a threshold compensation circuit, a data writing circuit, a light emitting control circuit and a driving transistor, where the reset circuit, the threshold compensation circuit, the data writing circuit and a control electrode of the driving transistor are coupled to a control node; the reset circuit is configured to write a reset voltage to the control node; the threshold compensation circuit is configured to perform threshold compensation on the driving transistor; the data writing circuit is configured to charge the control node according to a data voltage; the light emitting control circuit is configured to control a second electrode of the driving transistor to be electrically coupled to or decoupled from a first electrode of the light emitting element; the driving transistor is configured to output a corresponding driving current according to a voltage at the control node.