Pixel Circuit for Silicon LED Display Uniformity
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Solution Overview
Problem
Silicon-based LED display devices face issues with non-uniform lighting due to inconsistent lighting up voltages of light-emitting diode elements and electro-optic conversion characteristics that change with current, leading to reduced display efficiency and effect.
Innovation Solution
A pixel circuit is introduced, comprising a drive circuit and a light-emitting element connected in series, with a drive control sub-circuit, a light-emitting control sub-circuit, and a time-length control sub-circuit. This circuit provides a drive current and controls the time length of current conduction to stabilize light-emitting parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drive circuits are used with silicon-based LED display devices, then the manufacturing process is simple, but the lighting uniformity deteriorates due to inconsistent lighting up voltages and changing electro-optic conversion characteristics
Solution Approach 1:
The drive circuit is divided into three independent sub-circuits: drive control sub-circuit for current magnitude control, light emitting control sub-circuit for timing control, and time-length control sub-circuit for conduction duration control. This segmentation allows each sub-circuit to independently optimize its function, improving lighting uniformity through precise current control while managing complexity through modular design.
Solution Approach 2:
The patent dynamically adjusts multiple parameters including drive current magnitude, light emitting timing, and conduction time length based on the electro-optic conversion characteristics of the light emitting elements. By changing these parameters adaptively, the circuit compensates for voltage inconsistencies and maintains uniform lighting across all display elements.
2Illumination intensity
If the drive current is increased to improve light emission, then the brightness increases, but the electro-optic conversion efficiency deteriorates due to characteristic changes at higher currents
Solution Approach 1:
The drive control sub-circuit dynamically adjusts the drive current magnitude based on real-time electro-optic conversion characteristics of the light emitting elements. This dynamic adjustment ensures optimal brightness output while maintaining conversion efficiency by preventing excessive current that would cause characteristic degradation.
Solution Approach 2:
The circuit incorporates feedback mechanisms that monitor the electro-optic conversion characteristics and adjust the drive current accordingly. This feedback loop ensures that brightness is maintained at optimal levels while conversion efficiency is preserved by preventing operation in inefficient high-current regimes.
3Illumination intensity
If the light emitting time is extended to improve display visibility, then the visibility increases, but the power consumption increases and the refresh rate decreases
Solution Approach 1:
The light emitting control sub-circuit implements periodic light emission with precisely controlled duty cycles. By using periodic action with optimized timing, the circuit achieves sufficient display visibility during active emission periods while maintaining high refresh rates through efficient on-off cycling, avoiding continuous operation that would reduce refresh capability.
Solution Approach 2:
The time-length control sub-circuit manages multiple functions including light emission timing, refresh cycle coordination, and power management within a unified control framework. This multi-functionality allows the circuit to optimize visibility during emission while maintaining high refresh rates through coordinated timing control.
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 pixel circuit effectively controls light-emitting time lengths, improving the uniformity and efficiency of light emission under low gray scale conditions, thereby enhancing the display effect of silicon-based LED display devices.
Implementation Method 1
Silicon-based light emitting diode display devices
Implementation Method 2
the light emitting element is configured to receive the drive current in the current path and emit light
Data Source
AI summary
A pixel circuit, a driving method therefor, a display substrate and a display device are provided. The pixel circuit includes a drive circuit and a light emitting element connected in series between a first power supply terminal and a third power supply terminal; the drive circuit is used for providing a drive current and controlling a time length of conduction of a current path between the first power supply terminal and the third power supply terminal; the light emitting element is used for receiving the drive current in the current path and emitting light; the drive circuit includes a drive control sub-circuit, a light emitting control sub-circuit and a time-length control sub-circuit; the drive control sub-circuit is used for providing a drive current to the first node under control of the first scan signal terminal, the first data signal terminal and the second node.