LED Driver Circuit With Short-Circuit Luminance Compensation
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Solution Overview
Problem
Light emitting devices experience insufficient luminance due to the partial breakdown of light emitting elements, leading to a decrease in the number of functioning diodes, which can compromise safety and requires additional components and increased power consumption when using backup systems.
Innovation Solution
A light emitting element driving semiconductor integrated circuit with a single-element short-circuit detection unit and control unit that increases current supply to the series connection unit when a short-circuit is detected, and a determining unit that adjusts current distribution among systems to maintain luminance by stopping or increasing current as needed based on detected luminance decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If backup light emitting diodes and driving circuits are added to maintain luminance when elements fail, then luminance sufficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the electrical parameters (current magnitude and distribution) of the existing light emitting diodes rather than adding backup components. When a short-circuit is detected, the control unit increases current to remaining functional diodes or redistributes current across multiple systems, thereby maintaining luminance without increasing device complexity
Solution Approach 2:
The patent implements dynamic current control where the driving circuit continuously monitors and adjusts current distribution based on the operational status of light emitting diodes. The control unit dynamically reallocates current from failed elements to functional elements, maintaining adequate luminance output without requiring static backup components
2Illumination intensity
If backup light emitting diodes and driving circuits are added to maintain luminance when elements fail, then luminance sufficiency is improved, but power consumption increases
Solution Approach 1:
The patent adjusts current parameters dynamically - increasing current magnitude only to the extent necessary to compensate for failed elements and maintain target luminance. This optimized parameter adjustment prevents excessive power consumption that would result from simply activating all backup components at full power
3Illumination intensity
If current is increased to remaining light emitting diodes when one fails, then luminance is maintained, but reliability decreases due to increased stress on remaining elements
Solution Approach 1:
The patent implements dynamic monitoring and adaptive current control where the system continuously assesses the operational status of light emitting diodes and adjusts current distribution in real-time. This dynamic approach allows the system to respond to failures while managing stress distribution to prevent cascading failures
Solution Approach 2:
The patent incorporates feedback mechanisms where the control unit monitors the performance and status of light emitting diodes, detecting short-circuits and luminance levels. This feedback enables the system to adjust current distribution optimally - increasing current only when necessary and only to the extent needed to maintain luminance, thereby managing the trade-off between luminance maintenance and reliability
Data Source
AI summary
A light emitting element driving semiconductor integrated circuit constitutes at least a part of a light emitting element driving device arranged to drive a series connection unit including a plurality of light emitting elements. The light emitting element driving semiconductor integrated circuit includes a single-element short-circuit detection unit arranged to detect that one of the plurality of light emitting elements is short-circuited, and a control unit arranged to control a power element of the light emitting element driving device so that current supplied from the light emitting element driving device to the series connection unit is increased, when the single-element short-circuit detection circuit detects that one of the plurality of light emitting elements is short-circuited.