Pixel Circuit Reset Segmentation for Uniform Gate-Source Voltage
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Solution Overview
Problem
Existing pixel circuits in flexible display panels suffer from afterimage and flicker issues due to varying gate-source voltage differences caused by different gray scale resets, leading to inconsistent display performance.
Innovation Solution
A pixel circuit design incorporating a drive sub-circuit, a first reset sub-circuit, and a second reset sub-circuit, where the second reset signal is greater than the first reset signal, ensuring uniform gate-source voltage resetting across different data signals, thereby stabilizing the display output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit uses a single reset signal for the drive transistor, then the circuit structure remains simple, but gate-source voltage varies with different gray scale resets causing afterimage and flicker
Solution Approach 1:
The reset function is segmented into two independent sub-circuits: a first reset sub-circuit that resets the gate terminal to a first initial voltage, and a second reset sub-circuit that resets the source terminal to a second initial voltage. This segmentation allows each sub-circuit to independently control the resetting of different terminals, ensuring uniform gate-source voltage regardless of gray scale values, thereby eliminating afterimage and flicker while maintaining circuit reliability.
2Ease of manufacture
If the gate-source voltage is not uniformly reset, then the circuit operation becomes simpler, but display performance becomes inconsistent with afterimage and flicker artifacts
Solution Approach 1:
The first reset sub-circuit performs preliminary resetting of the gate terminal to a predetermined first initial voltage before the drive transistor operates. This preliminary action ensures that the gate terminal starts from a known, uniform voltage state, which when combined with the second reset sub-circuit's resetting of the source terminal, guarantees uniform gate-source voltage and prevents afterimage and flicker artifacts.
3Reliability
If different initial voltages are applied to gate and source terminals, then the reset function is achieved, but gate-source voltage difference causes inconsistent display output
Solution Approach 1:
The first reset sub-circuit and second reset sub-circuit act as intermediary components between the drive transistor and the signal lines. These intermediary sub-circuits transform the reset signals into controlled voltage applications at the gate and source terminals respectively, ensuring that the gate-source voltage difference is uniformly established regardless of the complexity of the reset control signals, thereby achieving reliable and consistent display output.
Data Source
AI summary
A pixel circuit includes a drive sub-circuit, a first reset sub-circuit, a second reset sub-circuit, and a light emitting element. The drive sub-circuit is configured to generate a drive current between a first electrode and a second electrode of the drive sub-circuit in response to a control signal of a first node. The first reset sub-circuit is configured to write a first reset signal to an anode terminal of the light emitting element in response to a signal of a first light emitting control signal line or a second reset control signal line. The second reset sub-circuit is configured to write a second reset signal to the first electrode or second electrode of the drive sub-circuit in response to a signal of a first reset control signal line. The second reset signal is greater than the first reset signal.