OLED Pixel Driving Circuit with Shared Transistor Architecture
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Solution Overview
Problem
Organic light-emitting diode (OLED) display devices face non-uniformity in display brightness due to deviations in transistor characteristics, requiring complex circuit configurations to address this issue.
Innovation Solution
A pixel driving circuit with a light-emitting control sub-circuit and multiple display control sub-circuits, where the display control sub-circuits are connected to a shared light-emitting control sub-circuit, allowing for efficient transmission of power and data signals to drive light-emitting elements, thereby simplifying the circuit structure and improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complicated circuit configuration is used to compensate for transistor characteristic deviations, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the light-emitting control function into the display control sub-circuit by sharing the transistor between the light-emitting control branch and the display control branch. This integration eliminates the need for separate dedicated light-emitting control transistors, thereby reducing overall circuit complexity while maintaining the ability to control both light emission and display functions independently through shared control nodes
Solution Approach 2:
The shared transistor serves multiple functions: it acts as a switch for the light-emitting element, a control element for the display control sub-circuit, and a component for signal routing between different circuit branches. This multi-functionality reduces the total number of transistors required while preserving all necessary control capabilities for brightness uniformity
2Measurement precision
If more transistors are added to each pixel circuit for better control, then control precision is improved, but aperture ratio decreases
Solution Approach 1:
The patent combines multiple control functions into shared transistors and control nodes, reducing the total transistor count per pixel circuit. This reduction directly increases the aperture ratio by freeing up pixel area, while the shared architecture maintains control precision through coordinated control signals applied to the shared nodes
3Device complexity
If a simplified circuit structure is used, then device complexity is reduced, but control capability deteriorates
Solution Approach 1:
The patent segments the pixel circuit into distinct functional sub-circuits (light-emitting control branch and display control sub-circuit) that share common control elements. This segmentation allows independent optimization of each function while the shared transistors and control nodes provide coordinated control, maintaining versatile control capability despite the simplified overall structure
Solution Approach 2:
The shared transistors and control nodes perform multiple control functions simultaneously, enabling the simplified circuit to maintain full control capability for both light-emitting and display operations. The universal control elements can be selectively activated to provide the required control precision for different operational modes
Data Source
AI summary
A pixel driving circuit includes a light-emitting control sub-circuit and a plurality of display control sub-circuits. The light-emitting control sub-circuit is connected to a light-emitting control signal terminal, a power supply signal terminal and a light-emitting control node, and is configured to transmit a power supply signal from the power supply signal terminal to the light-emitting control node in response to a light-emitting control signal received from the light-emitting control signal terminal. Each display control sub-circuit is connected to the light-emitting control node, a scan signal terminal, a data signal terminal, and a light-emitting element. Each display control sub-circuit is configured to, in response to a scan signal received from the scan signal terminal, output a driving signal according to the power supply signal and a data signal from the data signal terminal, so as to drive the light-emitting element to emit light.