OLED Pixel Driving Circuit Alternating Current Compensation
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Solution Overview
Problem
The threshold voltage drift of transistors in OLED pixel driving units leads to instability in luminance and accelerated aging of OLED display products, as existing compensation methods either maintain stable luminance but damage the product's service life or fail to address the drift issue effectively.
Innovation Solution
A pixel driving circuit with two drivers and a light emitting element, where the drivers alternately function as main and compensation modules, generating and switching between driving currents to provide real-time current compensation, stabilizing luminance and extending product life by minimizing threshold voltage drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional compensation methods are used to maintain stable luminance, then luminance stability is improved, but product service life is reduced due to accelerated aging
Solution Approach 1:
The pixel driving circuit is divided into two independent driving units (first driving unit and second driving unit), each capable of independently driving the light emitting element. This segmentation allows the circuit to alternate between different driving paths, preventing any single transistor from experiencing continuous threshold voltage drift, thereby maintaining luminance stability while reducing aging stress on individual components.
Solution Approach 2:
The patent implements periodic switching between the first and second driving units. The control circuit alternately activates these units in a cyclic manner, allowing each unit to rest and recover while the other is active. This periodic action prevents continuous stress accumulation in any single transistor, addressing both luminance stability and service life extension requirements.
2Duration of action of stationary object
If threshold voltage drift is not compensated, then product service life is extended, but luminance stability deteriorates
Solution Approach 1:
The patent incorporates a control circuit that monitors the driving status of both units and dynamically adjusts their operation. This feedback mechanism detects threshold voltage drift in real-time and compensates by switching between units or adjusting driving parameters, ensuring luminance stability is maintained while managing the aging process to extend service life.
3Device complexity
If a single driving unit is used continuously, then device complexity is reduced, but threshold voltage drift increases leading to luminance instability
Solution Approach 1:
The patent merges two driving units into a single pixel driving circuit, where both units share common components such as the light emitting element and control circuitry. This merging approach increases device complexity slightly but provides redundant driving paths that compensate for threshold voltage drift, thereby maintaining luminance stability through the ability to switch between units.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures stable and uniform luminance, improving display quality while fundamentally solving the threshold voltage drift problem, thereby prolonging the service life of OLED products.
Implementation Method 1
Organic Light Emitting Diode (OLED), as a current-type light emitting device... The first driving current and the second driving current alternately drive the light emitting element to be a main driving current
Data Source
AI summary
The present disclosure provides a pixel driving circuit, a driving method thereof, and a display device, and relates to the field of display technology. The pixel driving circuit includes a first driver, a second driver, and a light emitting element. The first driver is configured to generate a first driving current. The second driver is configured to generate a second driving current. The first driving current and the second driving current alternately drive the light emitting element as a main driving current.