LED Pixel Driving Circuit With Pulsed Current for Luminous Efficiency
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Solution Overview
Problem
Existing display technologies face challenges in achieving optimal luminous efficiency while managing the driving current density and characteristics of different types of light-emitting diodes, particularly red, green, and blue LEDs, which require different current levels for efficient operation.
Innovation Solution
A display device with a light-emitting module comprising N×M pixel modules in a two-dimensional array, where each pixel module includes a driving circuit that applies a driving current with a duty cycle of 1/J during a working interval, increasing the current to J times the average current, thereby improving luminous efficiency without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving current is increased to improve luminous efficiency of red LEDs, then the luminous efficiency is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic pulsed driving to the LEDs, where current is supplied in discrete time intervals rather than continuously. By controlling the duty cycle and pulse width of the driving current, the system achieves high luminous efficiency during active periods while maintaining low average power consumption through periodic off-periods, thus resolving the contradiction between efficiency and power consumption.
Solution Approach 2:
The patent dynamically adjusts the driving current parameters including pulse width, duty cycle, and current amplitude based on real-time requirements. This dynamic control allows the system to optimize the balance between luminous efficiency and power consumption by adapting the current profile to match actual display needs, rather than using fixed continuous current.
2Quantity of substance
If the pitch of pixels is reduced to increase pixel density, then the pixel density is improved, but the driving current density increases
Solution Approach 1:
By implementing periodic pulsed driving with optimized duty cycles for each pixel type, the system can maintain high pixel density while controlling the average current density. The periodic off-periods allow heat dissipation and reduce the cumulative thermal load, enabling higher pixel density without proportionally increasing average power consumption.
Solution Approach 2:
The patent applies different driving current characteristics to different pixel types (red, green, blue LEDs) based on their specific luminous efficiency characteristics. Each pixel type receives optimized pulsed current parameters tailored to its requirements, allowing uniform luminous output across the display while managing overall current density through localized optimization.
3Use of energy by moving object
If different current levels are applied to red, green, and blue LEDs to optimize their respective efficiencies, then the luminous efficiency of each type is improved, but the circuit complexity increases
Solution Approach 1:
The patent employs a universal pulsed driving circuit architecture that can accommodate multiple LED types through software-controlled parameter adjustment. The same basic driving circuit structure handles red, green, and blue LEDs by varying pulse width, duty cycle, and current amplitude parameters, eliminating the need for separate dedicated driving circuits for each LED type and thus reducing circuit complexity.
Solution Approach 2:
The system achieves different current characteristics for different LED types by dynamically changing driving parameters rather than using physically different circuits. The controller adjusts pulse width, duty cycle, and current magnitude based on the specific LED type being driven, allowing a single circuit design to optimize efficiency across all color types through parameter modulation.
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 enhances luminous efficiency of LEDs by increasing the driving current while maintaining consistent average power consumption, reducing the number of signal lines and driving circuits, and simplifying circuit fabrication, with a 3-5% reduction in power consumption.
Implementation Method 1
Each of the pixels comprises a plurality of light-emitting diodes
Implementation Method 2
different types of light-emitting diodes have different characteristics
Data Source
AI summary
A light-emitting module comprises N×M pixel modules arranged in a two-dimensional array wherein N and M are positive integers greater than or equal to 2. Each of the pixel modules comprises a plurality of pixels and a driving circuit for controlling the plurality of pixels. Each of the pixels comprises a plurality of light-emitting diodes. Each driving circuit is configured to apply a driving current to the light-emitting diodes in the corresponding pixel module. In a time period, a duty cycle of a working period of the driving current is 1/J, and in the working period, the driving current is J times an average driving current, and J is a positive integer equal to or greater than 2.