LED Display Current Control for Power and Heat Management
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Solution Overview
Problem
As the density of LEDs in display devices increases, managing heat dissipation and power consumption becomes increasingly challenging due to the need for efficient control of driving currents and voltage supply.
Innovation Solution
A control circuit that determines a group current level and duty cycles for LED channels based on brightness data, selecting the lowest predefined current level that exceeds average channel currents and adjusts the shared supply voltage to minimize power consumption, while ensuring all channels are driven effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of LEDs in display devices is increased, then the display resolution and quality are improved, but heat dissipation and power consumption management become increasingly challenging
Solution Approach 1:
The patent applies dynamics by making the current level configurable and adjustable based on operational requirements. The control circuit can dynamically select from multiple current levels (first current level for high brightness, second current level for low brightness) depending on the display needs, allowing the system to adapt its power consumption to actual usage scenarios rather than operating at a fixed high-current state
Solution Approach 2:
The patent changes the electrical parameters (current level and voltage level) of the LED driving system to optimize power consumption. By switching between different current levels and voltage levels based on brightness requirements, the system can maintain high display quality when needed while significantly reducing power consumption during normal operation, directly addressing the contradiction between display density and power management
2Measurement precision
If the density of LEDs in display devices is increased, then the display resolution and quality are improved, but heat dissipation management becomes increasingly challenging
Solution Approach 1:
The system dynamically adjusts current levels based on actual display requirements. During normal operation, the lower second current level is used which generates less heat. When high brightness is needed, the system temporarily switches to the first current level. This dynamic adjustment prevents continuous high heat generation that would occur with fixed high-current operation, making heat dissipation manageable even with high LED density
Solution Approach 2:
By changing the electrical parameters (current and voltage levels) of the LED driving system, the patent directly controls the heat generation. The control circuit can select from multiple current levels and voltage levels, allowing the system to operate at lower power/heat states during normal use and only switch to high-power states when display quality requires it, thus managing heat dissipation effectively
3Device complexity
If a shared supply voltage is used for all LED channels, then device complexity is reduced, but it becomes difficult to optimize power consumption for individual channels with different brightness requirements
Solution Approach 1:
The patent introduces dynamic control capability into the system by allowing the control circuit to selectively apply different current levels and voltage levels to different LED channels based on their individual brightness requirements. This dynamic per-channel optimization is achieved while maintaining the simplicity of a shared supply voltage architecture, resolving the contradiction between device complexity and power optimization
Solution Approach 2:
The control circuit implements local quality optimization by treating each LED channel individually - it determines appropriate current levels and voltage levels for each channel based on its specific brightness requirements, even though all channels share the same physical supply voltage. This allows tailored power optimization for each channel without requiring separate physical power supplies, maintaining system simplicity while achieving fine-grained power control
Data Source
AI summary
A display device comprises a control circuit and a plurality of LED channels coupled to a shared supply voltage. The control circuit obtains respective brightness levels for each of the LED channels and determines, based on the brightness levels, a group current level sufficient to drive all of the LED channels. The control circuit also determines respective duty cycles for each of the LED channels that will achieve the respective brightness levels when each of the LED channels are driven with the group current level. The control circuit configures driver circuits to drive the LED channels in accordance with the group current level and the respective duty cycles. The control circuit may furthermore obtain sensed channel voltages associated with each of the LED channels, and configure the shared voltage supply based on the sensed channel voltages to a voltage level sufficient to drive all of the LED channels.