Pixel Circuit With Single-Capacitor Voltage Compensation
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Solution Overview
Problem
Conventional self-luminous pixel circuits require multiple capacitors and transistors for voltage compensation, leading to increased circuit area and design challenges.
Innovation Solution
A pixel circuit design that utilizes a single capacitor to reduce circuit area, incorporating a light-emitting element, driving circuit, compensation circuits, reset read circuit, data writing circuit, and light-emitting control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple capacitors and transistors are used for voltage compensation in conventional self-luminous pixel circuits, then voltage compensation performance is improved, but circuit area increases
Solution Approach 1:
The patent combines multiple capacitor functions into a single capacitor structure. The capacitor is coupled between the gate control node and the control node, serving multiple purposes: voltage compensation, threshold voltage adjustment, and maintaining stable operating conditions. This merging of functions reduces the number of separate capacitor components needed while preserving the voltage compensation performance.
Solution Approach 2:
The single capacitor in the patent serves multiple functions simultaneously: it provides voltage compensation for the driving transistor, maintains the threshold voltage at different operational stages, and contributes to the overall stability of the pixel circuit. This multi-functionality eliminates the need for separate dedicated capacitors for each function, thereby reducing circuit area.
2Area of moving object
If the area occupied by a single pixel circuit is reduced to increase pixel density, then display resolution is improved, but circuit design complexity increases
Solution Approach 1:
By merging multiple capacitor functions into a single capacitor component, the patent reduces the overall circuit area, enabling higher pixel density. The capacitor is strategically positioned between the gate control node and control node to perform multiple functions within the constrained space, thereby achieving compact circuit design without sacrificing functionality.
Solution Approach 2:
The patent utilizes parameter changes in the capacitor's voltage and charge states to achieve different operational modes. By changing the voltage across the capacitor and the charge stored, the circuit can adapt to different operational requirements (reset, data writing, light-emitting, compensation) without requiring additional components, thus simplifying the circuit design for high pixel density applications.
Data Source
AI summary
A pixel circuit is provided. The pixel circuit includes: a light-emitting element, a driving circuit, a capacitor, a first compensation circuit, a second compensation circuit, a reset read circuit, a data writing circuit, and a light-emitting control circuit. The light-emitting element has a cathode that receives a system low voltage. The driving circuit provides a driving current based on a gate voltage. The capacitor is coupled between a gate control node and a control node. The first compensation circuit provides a system high voltage to the control node and the driving circuit. The second compensation circuit provides a reference voltage to the driving circuit. The reset read circuit provides an initial voltage to the control node and the gate control node. The data writing circuit provides a data signal to the gate control node. The light-emitting control circuit provides the driving current to the light-emitting element.