OLED Pixel Circuit Shared Scanning Lines
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Solution Overview
Problem
High-resolution organic light emitting display (OLED) designs face challenges due to excessive scanning lines and reset wires, which complicate the pixel circuit architecture and affect the display's efficiency and complexity.
Innovation Solution
The proposed pixel circuit design includes multiple transistors and light-emitting devices connected through a specific configuration of scanning lines and reset power supply lines, allowing for efficient current control and light emission, with shared scanning lines to reduce the number of wires needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of scanning lines and reset wires is increased to achieve high resolution, then the display resolution is improved, but the device complexity and wiring structure become excessive
Solution Approach 1:
The patent merges the reset function into the scanning line structure by introducing reset transistors that are controlled by scanning lines. This allows the scanning lines to serve dual purposes: both scanning and resetting, thereby reducing the need for separate dedicated reset wires and simplifying the overall wiring structure while maintaining high display resolution
Solution Approach 2:
The scanning lines are designed to perform multiple functions: they serve as both scan signals to activate pixels and as reset signals to clear previous states. This multi-functionality reduces the total number of wiring lines required, resolving the contradiction between high resolution requirements and wiring complexity
2Device complexity
If multiple transistors and light-emitting devices are connected through shared scanning lines, then the device complexity is reduced, but the current control efficiency may be affected
Solution Approach 1:
The patent segments the pixel circuit into functional modules with dedicated transistors for different operations (scan, reset, data input, light emission). Each transistor is optimized for its specific function, allowing independent control and optimization of current paths while sharing common scanning lines, thus maintaining current control efficiency despite reduced overall complexity
Solution Approach 2:
The circuit design incorporates dynamic control through timing sequences where scanning lines are activated in specific orders to control the switching of transistors. This dynamic operation ensures that current flows efficiently through the intended paths at the correct times, maintaining productivity while benefiting from the simplified shared architecture
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 configuration enables efficient light emission and reduces the complexity of high-resolution OLED displays by optimizing the connection of transistors and light-emitting devices, improving the display's performance and scalability.
Implementation Method 1
Each pixel supplies current based on a data signal to the organic light emitting diode (OLED). The OLED emits light based on the amount of the supplied current.
Data Source
AI summary
A pixel circuit includes a first pixel and a second pixel. The first pixel includes a first transistor to control current to a first light emitter and a second transistor to connect the first light emitter to first reset power. The second pixel includes a third transistor to control current to a second light emitter and a fourth transistor to connect the second light emitter to the first reset power. The second and fourth transistors are controlled by a same control signal.