Pixel Circuit Voltage Division for Low Gray Scale Display Precision
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Solution Overview
Problem
Existing pixel circuits face limitations in providing precise data voltage adjustments for low gray scale displays, leading to reduced display quality due to limited voltage division ability.
Innovation Solution
A pixel circuit comprising a driving sub-circuit, voltage division control sub-circuit, and compensation sub-circuit that conducts voltage division on input data signals and writes the voltage division signal to the control terminal, allowing for finer adjustments in data voltage, thereby enhancing low gray scale display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pixel circuits are used, then the circuit structure is simple, but the voltage division ability is limited resulting in poor low gray scale display quality
Solution Approach 1:
The pixel circuit is divided into multiple functional sub-circuits: a driving sub-circuit containing a driving transistor, a voltage division control sub-circuit with first and second capacitors and transistors, and a compensation sub-circuit. This segmentation allows each sub-circuit to perform specific functions, with the voltage division control sub-circuit specifically responsible for precise voltage division through capacitor ratios, thereby improving voltage division precision while maintaining overall circuit manageability.
Solution Approach 2:
The circuit employs dynamic control through scanning signals that activate different sub-circuits at different time periods. The voltage division control sub-circuit is activated during specific periods to perform voltage division, while the compensation sub-circuit operates during other periods to compensate for threshold voltage variations. This dynamic operation allows the circuit to adapt its functionality based on operational requirements, achieving precise voltage division without permanent structural complexity.
2Measurement precision
If voltage division ability is improved through additional circuits, then low gray scale display quality is enhanced, but the circuit complexity increases
Solution Approach 1:
The voltage division control sub-circuit utilizes capacitor ratio parameters to achieve precise voltage division. By adjusting the capacitance values of the first and second capacitors, the circuit can divide the input data voltage into precise proportions (e.g., 1:1, 2:1, or other ratios). This parameter-based approach allows flexible voltage adjustment for different gray levels without requiring complex additional circuitry, as the division ratio is determined by simple capacitor value selections.
Solution Approach 2:
The compensation sub-circuit provides feedback mechanisms to correct for threshold voltage variations in the driving transistor. During specific time periods, the compensation sub-circuit measures and compensates for threshold voltage shifts, ensuring that the voltage division remains accurate despite device variations. This feedback approach maintains measurement precision without requiring overly complex circuit structures, as it uses the existing circuit elements in a feedback configuration.
Data Source
AI summary
A pixel circuit, a driving method thereof and electronic device, relates to the technical field of display configured for. The pixel circuit comprises a driving sub-circuit comprising a control terminal, a first terminal and a second terminal, the driving sub-circuit being configured to control a driving signal flowing through the first terminal and the second terminal according to a signal of the control terminal; a voltage division control sub-circuit configured to conduct voltage division on an input data signal in response to a first scanning signal to obtain a voltage division signal, and write the voltage division signal to the first terminal of the driving sub-circuit; and a compensation sub-circuit coupled to the control terminal of the driving sub-circuit and the second terminal of the driving sub-circuit, and configured to write voltage division signal passing through driving sub-circuit to control terminal of driving sub-circuit in response to first scanning signal.