AMOLED Pixel Circuit Dual Power Supply Selection
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Solution Overview
Problem
The challenge in AMOLED display panels is non-uniform luminance between pixels, which is often addressed by complex pixel structures that increase power consumption.
Innovation Solution
A pixel circuit comprising a selecting module, a writing module, and a driving module, where the selecting module chooses between two power supply signals to optimize power usage based on luminance needs, allowing the driving module to efficiently control the light emitting element for high and low luminance displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex pixel structures are used to compensate for non-uniformity and threshold voltage drifting, then display uniformity is improved, but power consumption increases
Solution Approach 1:
The patent changes the power supply voltage parameter dynamically by introducing a second power supply signal terminal with a lower voltage level. The selecting module switches between first power supply signal (higher voltage) and second power supply signal (lower voltage) based on luminance requirements, thereby reducing power consumption while maintaining display uniformity through controlled parameter variation.
Solution Approach 2:
The patent implements dynamic operation by enabling the selecting module to switch between different power supply signals based on real-time luminance needs. This dynamic power supply strategy allows the pixel circuit to adapt its power consumption level according to the actual display requirements, rather than operating at a fixed high power state.
2Manufacturing precision
If typical pixel compensating circuits are used to solve non-uniformity issue, then luminance uniformity is improved, but pixel structure becomes complicated
Solution Approach 1:
The selecting module serves multiple functions: it selects between different power supply signals, controls the driving module operation, and enables dynamic power management. This multi-functional component replaces what would traditionally require separate compensating circuits, thereby maintaining luminance uniformity while reducing overall pixel structure complexity.
Solution Approach 2:
Instead of using complex compensating circuits to adjust for non-uniformity, the patent changes the power supply voltage parameter to achieve luminance uniformity. By switching between first and second power supply signals with different voltage levels, the system achieves uniform display performance through parameter adjustment rather than structural complexity.
3Illumination intensity
If first power supply signal is always used to drive light emitting element, then luminance output is sufficient, but power consumption is high
Solution Approach 1:
The patent implements dynamic power supply selection where the selecting module switches between first power supply signal (higher voltage for sufficient luminance) and second power supply signal (lower voltage for reduced power consumption). This dynamic adjustment allows the system to optimize the balance between luminance output and power consumption based on actual display requirements.
Solution Approach 2:
The patent changes the power supply voltage parameter from a fixed high level to a dynamically adjustable level. By switching between first power supply signal and second power supply signal with different voltage parameters, the system achieves sufficient luminance output only when necessary, thereby reducing overall power consumption while maintaining adequate display performance.
Data Source
AI summary
A pixel circuit, a driving method for the pixel circuit, a display panel, and a display device, the pixel circuit includes a selecting module (01), a writing module (02), a driving module (03), and a light emitting element (OLED). When a high-luminance picture needs to be displayed, the selecting module (01) outputs the signal from the first power supply signal terminal (VDDH) to the second node (P2), so that the signal from the first power supply signal terminal (VDDH) drives the light emitting element (OLED) to emit light; when a low-luminance picture is to be displayed, the selecting module (01) outputs a signal from the second power supply signal terminal (VDDL) to the second node (P2), so that the signal from the second power source signal (VDDL) drives the light emitting element to emit light.