Parallel Pixel Drive Circuit for Higher Display Current
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Solution Overview
Problem
The existing pixel driving circuits in display panels are limited by the data range of the chip, preventing them from outputting a sufficiently large driving current.
Innovation Solution
A pixel driving circuit design that includes multiple driving transistors, each connected to a light-emitting unit, with a gate electrode controlling the input of driving current, and additional circuits for data writing, compensation, light-emitting control, reset, and storage, enhancing current output capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single driving transistor is used in the pixel driving circuit, then the circuit structure is simple, but the driving current output is insufficient due to data range limitations
Solution Approach 1:
The pixel driving circuit is divided into multiple driving transistors (first driving transistor and second driving transistor) that work in parallel. Each transistor handles a portion of the driving current, enabling the circuit to output larger total current while maintaining controllable complexity through modular architecture
Solution Approach 2:
The multiple driving transistors serve dual purposes: they collectively provide high current output capability while individually responding to the same data signal. This multi-functionality allows the circuit to achieve both high power output and signal compatibility without requiring completely separate control paths
2Power
If multiple driving transistors are added to increase driving current output, then the power output is improved, but the device complexity increases
Solution Approach 1:
Multiple driving transistors are merged into a single parallel configuration where their first electrodes connect to the same node and their second electrodes connect to the light-emitting unit. This merging strategy achieves current multiplication while minimizing the increase in circuit complexity by sharing common connection points
Solution Approach 2:
The circuit incorporates dynamic control mechanisms including reset circuits that can selectively control the state of each driving transistor. This dynamic control allows the system to adapt the number of active transistors based on current requirements, effectively managing complexity by activating only necessary components
3Power
If the data range is expanded to allow larger driving current, then the driving current output is improved, but the chip design becomes more complex
Solution Approach 1:
Instead of changing the data signal voltage range, the invention changes the structural parameter of the driving circuit by adding parallel transistors. This parameter change in circuit topology allows the same data signal range to control a much larger total current, avoiding the need to expand the data range and the associated chip design complexity
Data Source
AI summary
A pixel drive circuit includes: a plurality of driving transistors, wherein a second electrode of each of the plurality of driving transistors is connected to a first electrode of a same light-emitting unit, and each of the plurality of driving transistors is configured to input a driving current to the light-emitting unit according to a voltage of a gate electrode of each of the plurality of driving transistors.