LED Driver Circuit Dynamic Brightness Control
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Solution Overview
Problem
Conventional light emitting diode (LED) display systems face issues with user discomfort due to inadequate brightness adjustment in varying ambient light conditions, leading to eye strain and display quality problems like color shift and flicker.
Innovation Solution
A circuit and method for driving a light emitting diode light source assembly that dynamically adjusts brightness by determining and allocating the number of LED groups to be turned on at specific positions, using a processor to calculate and select the necessary LED groups based on ambient light levels, ensuring a consistent and even brightness distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness level of the display apparatus is increased to compensate for dark ambient light, then the display visibility is improved, but the user experiences eye discomfort and strain
Solution Approach 1:
The patent implements dynamic brightness adjustment by continuously monitoring ambient light levels and automatically modifying display brightness accordingly. The system transitions from static brightness settings to dynamic adaptation, adjusting the backlight intensity in real-time to match ambient conditions and maintain optimal viewing comfort.
Solution Approach 2:
The patent employs a feedback mechanism where ambient light sensors detect environmental light levels and provide input to the control system. This feedback loop enables the display apparatus to automatically adjust brightness levels based on real-time ambient conditions, preventing eye strain by avoiding excessive brightness in dark environments.
2Object-affected harmful factors
If the brightness level of the display apparatus is decreased to match bright ambient light, then the viewing comfort is improved, but the display visibility and contrast are reduced
Solution Approach 1:
The system dynamically adjusts brightness levels based on real-time ambient light detection. In bright ambient conditions, the display automatically reduces backlight intensity to match surroundings, maintaining viewing comfort while preserving adequate visibility through proportional adjustment rather than fixed brightness levels.
Solution Approach 2:
The feedback mechanism from ambient light sensors enables the display to automatically modulate brightness levels in response to environmental conditions. This ensures that in bright ambient light, the display does not remain overly bright, thereby maintaining comfort while preserving sufficient contrast and visibility through adaptive control.
3Device complexity
If conventional LED driving methods are used, then the circuit complexity is low, but color shift and flicker occur due to inadequate brightness control
Solution Approach 1:
The patent segments the LED light source into multiple independently controllable LED groups or individual LEDs. This segmentation enables precise control of brightness levels for each segment, allowing the system to achieve uniform illumination and eliminate color shift by controlling different segments at appropriate intensity levels.
Solution Approach 2:
The patent implements periodic scanning or sequential activation of LED groups to achieve uniform illumination. By cycling through different LED segments in a controlled sequence and using pulse-width modulation, the system eliminates flicker while maintaining low circuit complexity, as the same simple driver circuit repeatedly activates different segments in a timed manner.
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
This solution provides improved user experience by maintaining optimal display contrast and preventing eye strain, while eliminating color shift and flicker issues by precisely controlling LED activation and deactivation in a high-frequency cycle.
Implementation Method 1
a photosensor configured to detect an ambient light brightness level and generate an analog signal representing the ambient light brightness level
Data Source
AI summary
The present application discloses a circuit for driving a light emitting diode light source assembly having a plurality of light emitting diode groups, each group having at least one light emitting diode. The circuit includes a processor configured to determine a set brightness level, calculate a number of light emitting diode groups required to be on to achieve the set brightness level, and select the number of light emitting diode groups to be turned on at allocated positions in the light emitting diode light source assembly; and a driving sub-circuit configured to turn on the number of light emitting diode groups at the allocated positions. The number of light emitting diode groups is a positive integer N, N is less than a total number of the plurality of light emitting diode groups.