OLED Pixel Circuit with Shared Driving Branches
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Solution Overview
Problem
Existing OLED display products with low pixels per inch and low aperture ratio require extremely large light emitting currents to maintain luminance, leading to the need for multiple pixel driving circuits and a large number of transistors, which occupies significant layout space.
Innovation Solution
A pixel circuit with N driving branches, an energy storage circuit, a first initialization circuit, a data writing circuit, a compensation circuit, and a light emitting element, where the energy storage and initialization circuits are shared across driving branches to reduce transistor count and layout space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple pixel driving circuits are used to increase light emitting current, then the light emitting current is improved, but the layout space is worsened
Solution Approach 1:
The patent merges multiple driving circuits into a single integrated pixel circuit by sharing common components (transistors T1-T7, capacitors C1-C2) across multiple driving branches. Each driving branch (first, second, third driving branches) shares the same energy storage circuit and control circuits, allowing multiple light emitting elements to be driven simultaneously with a reduced total transistor count compared to using separate driving circuits for each element.
Solution Approach 2:
The patent implements multi-functionality by designing transistors and capacitors to serve multiple purposes across different driving branches. For example, transistor T1 functions as both a driving transistor for the first light emitting element and as a control element for subsequent branches, while capacitor C1 serves as the energy storage element for multiple branches. This universal design reduces the overall component count while maintaining the ability to drive multiple elements with high current.
2Power
If a large number of transistors are used to provide high light emitting current, then the light emitting current is improved, but the transistor count is worsened
Solution Approach 1:
The patent combines multiple driving functions into a single pixel circuit unit using a shared transistor network. Instead of using separate transistors for each driving function in each branch, the same transistors (T1-T7) are reused across multiple driving branches through clever circuit topology design, significantly reducing the total transistor count while maintaining high current driving capability.
Solution Approach 2:
The patent employs dynamic control of transistor switching states to achieve high light emitting current. By controlling the timing and sequence of transistor activation across different driving branches, the circuit dynamically allocates transistor functions based on operational requirements, allowing a smaller number of transistors to effectively drive multiple light emitting elements with high current demand.
Data Source
AI summary
A pixel circuit, pixel driving method and display apparatus are provided. The pixel circuit includes an energy storage circuit, a first initialization circuit, a data writing circuit, a compensation circuit, a light emitting element and N driving branches, N being an integer greater than 1; first and second terminals of the energy storage circuit are electrically connected to a driving node and a first voltage terminal, respectively; the first initialization circuit is electrically connected to a reset control terminal, an initial voltage terminal and the driving node, to write an initial voltage to the driving node under control of a reset control signal; the compensation circuit is electrically connected to a scanning control terminal, the driving node and a specific second node of N second nodes, to establish a connection between the driving node and the specific second node under control of a scanning control signal.