Pixel Circuit IR Drop Compensation via Phase-Specific Voltage Storage
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Solution Overview
Problem
Existing pixel circuits fail to fully compensate for the IR drop in power supply voltage, leading to uneven display performance and flicker issues due to voltage discrepancies between the data writing-in and light-emitting phases.
Innovation Solution
A pixel circuit design incorporating a driving circuit, energy storage circuit, control circuits, and reset circuits that allow for self-compensation of power supply voltage during the light-emitting phase, eliminating the influence of IR voltage drop on the light-emitting current and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply voltage compensation is implemented using voltage from different phases, then voltage compensation is achieved, but the compensation is incomplete due to voltage differences between phases
Solution Approach 1:
The patent stores the power supply voltage from the data writing-in phase in a storage capacitor before the light emitting phase begins. This preliminary action allows the circuit to use the previously stored voltage for compensation, ensuring that the compensation voltage matches the actual operating conditions without relying on voltage from a different phase.
Solution Approach 2:
The patent implements a feedback mechanism where the power supply voltage is continuously monitored and stored during the data writing-in phase, then fed back to the light emitting phase through the storage capacitor. This feedback loop ensures that the compensation is based on actual measured voltage rather than theoretical or different-phase voltage values.
2Adaptability or versatility
If different power supply voltages are used in data writing-in phase and light emitting phase, then phase-specific operation is enabled, but voltage inconsistency causes display non-uniformity and flicker
Solution Approach 1:
The storage capacitor captures and holds the power supply voltage from the data writing-in phase before the light emitting phase begins. This preliminary voltage storage ensures that when the light emitting phase occurs, the compensation circuit uses the previously stored voltage value, maintaining consistency across phases while still allowing each phase to operate with its specific voltage characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively compensates for IR voltage drop, enhancing display uniformity and reducing flicker by ensuring consistent power supply voltage during the light-emitting phase, thereby improving the overall performance of display products.
Implementation Method 1
an energy storage circuit, a first control circuit, a first reset circuit and a data writing-in circuit; a first terminal of the energy storage circuit is electrically connected to a first node, a second terminal of the energy storage circuit is electrically connected to a second node, and the energy storage circuit is used for storing electrical energy
Data Source
AI summary
A pixel circuit includes a driving circuit, an energy storage circuit, a first control circuit, a first reset circuit and a data writing-in circuit; the first control circuit is configured to control to connect the second node and a first terminal of the driving circuit under the control of a light-emitting control signal; the first reset circuit is configured to write a reference voltage into the second node under the control of a first reset control signal; the data writing-in circuit is configured to write a data voltage into the first terminal of the driving circuit under the control of a scan signal; the driving circuit is configured to control to connect the first terminal of the driving circuit and the second terminal of the driving circuit under the control of the control terminal of the driving circuit.