Pixel Circuit Threshold Compensation With Fewer Capacitors
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Solution Overview
Problem
Existing pixel circuits with internal threshold voltage compensation require a large number of capacitors, which hinders the realization of a narrow frame design.
Innovation Solution
A pixel circuit design that includes a driving circuit, a control circuit, an energy storage circuit, and a data writing-in circuit, along with optional reference voltage and initialization circuits, to compensate for threshold voltage deviations while reducing the number of capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal threshold voltage compensation is implemented using traditional pixel circuits, then threshold voltage deviation is fully compensated, but the number of capacitors increases
Solution Approach 1:
The patent combines the threshold voltage compensation function with the light emitting control function by sharing the first capacitor between these two operations. The first capacitor stores both the compensation voltage for threshold voltage deviation and controls the light emitting timing, thereby reducing the total capacitor count while maintaining full compensation capability.
Solution Approach 2:
The first capacitor serves multiple functions: it stores the compensation voltage to correct threshold voltage deviation, and simultaneously controls the light emitting timing by storing the light emitting control signal. This multi-functionality reduces the overall component count in the pixel circuit.
2Manufacturing precision
If more capacitors are used for threshold voltage compensation, then compensation accuracy is improved, but the frame width increases
Solution Approach 1:
The patent merges the compensation function with the light emitting control function by having the first capacitor serve both purposes. This integration reduces the number of discrete capacitor components needed, thereby reducing the horizontal space required and enabling narrower frame width while maintaining compensation accuracy.
Solution Approach 2:
The patent extracts the light emitting control function from a separate dedicated capacitor and integrates it into the existing first capacitor used for compensation. This extraction and integration approach eliminates redundant components and reduces the overall circuit footprint.
Data Source
AI summary
A pixel circuit, a driving method and a display device are provided. The pixel circuit includes a light emitting element, a driving circuit, a first energy storage circuit, a first control circuit and a data writing-in circuit; the first control circuit is configured to control to connect the first node and the second node under the control of a first light emitting control signal; a first terminal of the first energy storage circuit is electrically connected to the second node, and a second terminal of the first energy storage circuit is electrically connected to the second terminal of the driving circuit; the first energy storage circuit is configured to store electric energy; the data writing-in circuit is configured to write a data voltage into the second node under the control of a first scanning signal.