OLED Display Current Limiting Controller for Thermal Management
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Solution Overview
Problem
OLED display devices experience overheating issues, particularly when displaying images with high color saturation and contrast, as they require high currents, leading to excessive temperature increases, and existing solutions rely on separate measurement devices like temperature sensors to manage heat.
Innovation Solution
An organic light emitting diode display device that controls the current supplied to the panel using a controller to set and adjust a preset current limit value based on cumulative current data, without the need for a separate temperature sensor, thereby minimizing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high current is supplied to display images with high color saturation and contrast, then color saturation and contrast are improved, but temperature increases excessively
Solution Approach 1:
The patent applies dynamics by making the current limit value adjustable and changeable over time. The controller dynamically adjusts the current limit based on cumulative current accumulation, allowing the system to adapt between high current (for vivid colors) and low current (for temperature control) based on real-time conditions rather than using a fixed current value.
Solution Approach 2:
The patent changes the parameter of current limit value from a static setting to a dynamic parameter that varies based on cumulative current. By monitoring cumulative current and adjusting the current limit accordingly, the system modifies electrical parameters to balance color saturation requirements with temperature control needs.
2Temperature
If a temperature sensor is used to measure heat and control power supply voltage, then temperature control is achieved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the system to monitor and control its own temperature issues using existing components. The controller uses cumulative current information (which is already being tracked for other purposes) to infer temperature conditions and adjust current limits accordingly, eliminating the need for external temperature sensors and simplifying the system architecture.
Solution Approach 2:
The patent uses cumulative current as an intermediary parameter to bridge the gap between electrical operation and thermal management. Instead of directly measuring temperature with a sensor, the system uses cumulative current accumulation as a proxy indicator of thermal load, allowing temperature control through electrical parameter adjustment without physical temperature sensing.
3Temperature
If automatic current limit is performed to control current to preset limit value, then temperature increase is reduced, but current control flexibility is reduced
Solution Approach 1:
The patent resolves this contradiction by making the current limit dynamic rather than static. The current limit value changes based on cumulative current accumulation, allowing the system to be restrictive when needed (to prevent overheating) and permissive when safe (to maintain image quality). This dynamic adjustment preserves flexibility while still providing temperature protection.
Data Source
AI summary
An organic light emitting diode display device includes a panel in which a plurality of pixels are disposed, a power supplier configured to supply a current to the panel, and a controller configured to acquire information about the current supplied to the panel and perform an automatic current limit so that the current supplied to the panel is controlled to a preset current limit value or less. The controller is configured to adjust the current limit value based on the information about the current supplied to the panel.