OLED Driving Circuit Voltage Regulation for Brightness Consistency
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Solution Overview
Problem
Existing vehicle lamp driving circuits using constant current ICs are costly and struggle to maintain consistent brightness across varying temperatures due to the internal resistance changes of OLED devices.
Innovation Solution
A driving circuit comprising a voltage regulation circuit and a processing chip that provides a voltage regulation signal to reduce the difference between reference and driving currents of the OLED light-emitting unit, using a serial-to-parallel chip and differential amplification circuit to control the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a constant current driving IC is used to maintain consistent brightness at different temperatures, then the brightness consistency is improved, but the cost increases
Solution Approach 1:
The patent replaces expensive constant current driving ICs with a cost-effective voltage regulation circuit composed of basic electronic components (voltage regulator, transistors, resistors, capacitors). This substitution achieves comparable brightness consistency performance while significantly reducing component costs and simplifying the manufacturing process.
Solution Approach 2:
The patent substitutes the integrated constant current IC (electronic system) with a voltage regulation circuit that uses fundamental electronic components and control mechanisms. The replacement circuit regulates current through voltage control and feedback mechanisms, achieving the same functional outcome with simpler, cheaper components.
2Adaptability or versatility
If the internal resistance of OLED device changes with temperature, then the adaptability to temperature changes is improved, but the brightness consistency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the voltage regulation circuit continuously monitors the actual current through sensing resistors and adjusts the driving voltage accordingly. The processing chip compares the actual current with the reference current and generates correction signals to maintain consistent brightness despite temperature-induced resistance changes in the OLED device.
Solution Approach 2:
The patent dynamically adjusts the driving voltage parameter in response to temperature changes. The voltage regulation circuit modifies the voltage supplied to the OLED device based on temperature compensation algorithms, thereby compensating for resistance variations and maintaining stable current and brightness across different temperature conditions.
3Ease of manufacture
If a voltage regulation circuit is used instead of constant current IC, then the cost is reduced, but the current stability may worsen
Solution Approach 1:
The patent incorporates multiple feedback loops including voltage sensing through resistors (R1, R2, R3), current monitoring, and temperature compensation. The processing chip receives feedback signals and dynamically adjusts the voltage regulation circuit's output to maintain precise current control, ensuring current stability comparable to or exceeding that of constant current ICs while using cheaper components.
Solution Approach 2:
The patent employs dynamic control where the voltage regulation circuit and processing chip continuously adapt to changing conditions (temperature, load variations, OLED aging). The system adjusts voltage and current in real-time based on feedback, providing adaptive current stability that maintains reliability while reducing dependency on expensive dedicated constant current ICs.
Data Source
AI summary
A driving circuit is configured to drive a light-emitting unit to emit light, and the driving circuit includes: a voltage regulation circuit, configured to regulate a driving voltage of the light-emitting unit according to a voltage regulation signal; and a processing chip, configured to provide the voltage regulation signal to the voltage regulation circuit to reduce a difference between a reference current and a driving current of the light-emitting unit under a turned-on state.