Pixel Driving Circuit Stabilizes Current via Transistor Merging
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Solution Overview
Problem
Existing organic light emitting diode display devices face issues with unstable driving current due to threshold voltage deviations, leading to increased circuit complexity, power consumption, and larger layout areas, which are not adequately addressed by current pixel driving circuit designs.
Innovation Solution
A pixel driving circuit design that includes specific configurations of transistors and a capacitor to stabilize the driving current by eliminating the impact of threshold voltage and supply voltage changes, using a reduced number of scan signals to simplify the circuit layout and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing improved pixel driving circuit designs are used to eliminate threshold voltage impact, then driving current stability is improved, but circuit layout area increases and device complexity increases
Solution Approach 1:
The patent combines multiple transistor functions into a compact arrangement where transistors T1-T5 work together in an integrated configuration. The circuit merges the threshold voltage compensation function with the driving function, eliminating the need for separate compensation circuits while maintaining driving current stability.
Solution Approach 2:
The transistors in the circuit perform multiple functions: T1 and T2 form a compensation network that eliminates threshold voltage impact, while T3, T4, and T5 control the driving current. This multi-functional design achieves threshold voltage compensation without requiring additional dedicated compensation circuits, thereby reducing overall circuit area.
2Reliability
If existing improved pixel driving circuit designs are used to eliminate threshold voltage impact, then driving current stability is improved, but device complexity increases
Solution Approach 1:
The patent integrates threshold voltage compensation and driving control into a unified circuit structure using five transistors. The compensation network (T1, T2) is merged with the driving transistors (T3, T4, T5) to create a single compact block that performs both functions, reducing device complexity compared to separate compensation and driving circuits.
Solution Approach 2:
The circuit uses its own internal transistor network to automatically compensate for threshold voltage variations. The transistors T1 and T2 form a self-regulating compensation mechanism that adjusts the driving current based on threshold voltage changes, eliminating the need for external compensation circuits or additional control logic.
3Area of stationary object
If conventional pixel driving circuits are used, then circuit layout area is reduced, but driving current stability deteriorates due to threshold voltage deviation
Solution Approach 1:
The patent merges threshold voltage compensation with the driving circuit functions, achieving stability improvement without significant area increase. The compensation network is integrated into the same transistor block as the driving circuit, maintaining compact layout while eliminating threshold voltage impact on driving current.
Solution Approach 2:
The circuit performs self-compensation for threshold voltage variations using internal transistor feedback. The compensation mechanism is built into the driving circuit itself, allowing the circuit to maintain stable driving current without requiring external compensation components or additional layout space.
4Reliability
If existing improved pixel driving circuit designs are used, then threshold voltage impact is eliminated, but power consumption increases due to direct-current quiescent current path
Solution Approach 1:
The patent employs periodic switching of the transistor gates using scan signals to control the driving current. By using time-multiplexed gate control rather than continuous DC bias, the circuit eliminates persistent quiescent current paths while maintaining the ability to compensate for threshold voltage variations during active periods.
Solution Approach 2:
The circuit uses the scan signal timing to automatically manage current flow, turning off transistors during non-active periods. This self-regulating timing mechanism eliminates DC quiescent current paths while maintaining threshold voltage compensation capability during active display periods, reducing overall power consumption.
Data Source
AI summary
A pixel driving circuit includes a first transistor receiving a data signalsame. A first end of a second transistor is connected to the first end of the first transistor, and a gate of the same is connected to a second end of the second transistor. A second end of a third transistor is connected to the second end of the second transistor. A first end of a fourth transistor is connected to the gate of the first transistor. A second end of a fifth transistor is connected to the first end of the first transistor. A first end of the sixth transistor is connected to a second end of the first transistor. An anode of a light emitting diode is connected to a second end of the sixth transistor. A capacitor is connected between the first end and the gate of the first transistor.