Display Current Sensing Control for Rush Current and Power Reduction
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Solution Overview
Problem
Existing display devices face challenges in efficiently managing power consumption and luminance control due to fixed conversion times in current sensing circuits, which can lead to increased power consumption and reduced accuracy in rush current detection.
Innovation Solution
A display device that adjusts the conversion time of a current sensing circuit based on the voltage level of the power supply voltage, optimizing power management and current sensing operations by decreasing conversion time with higher voltage levels and increasing it with lower voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed conversion time is used in the current sensing circuit, then the circuit operation is simplified, but power consumption increases and rush current detection accuracy is reduced
Solution Approach 1:
The patent applies dynamics by making the conversion time variable rather than fixed. The controller dynamically adjusts the conversion time based on the power supply voltage level: using a first (shorter) conversion time when voltage is above a reference level, and a second (longer) conversion time when voltage is below the reference level. This dynamic adjustment optimizes both power consumption and detection accuracy for different operating conditions.
Solution Approach 2:
The patent changes the parameter of conversion time based on the power supply voltage level. By monitoring the voltage level and selecting appropriate conversion time values from a lookup table or register, the system adapts the sensing circuit's operation to match current operating conditions, thereby reducing power consumption while maintaining detection accuracy.
2Device complexity
If a fixed conversion time is used in the current sensing circuit, then the control logic is simplified, but rush current detection accuracy is reduced
Solution Approach 1:
The patent makes the conversion time dynamic based on voltage conditions. When the power supply voltage is high (above reference level), a shorter conversion time is used for rapid rush current detection. When voltage is low (below reference level), a longer conversion time is used to ensure accurate current measurement. This dynamic approach maintains detection accuracy across varying voltage conditions.
Solution Approach 2:
The system implements feedback by continuously monitoring the power supply voltage level and using this information to select the appropriate conversion time. The controller reads the voltage level, consults a lookup table or register to determine the optimal conversion time, and configures the current sensing circuit accordingly, creating a closed-loop control system that adapts to changing conditions.
3Measurement precision
If a longer conversion time is used, then current sensing accuracy is improved, but power consumption increases and rush current detection speed decreases
Solution Approach 1:
The patent dynamically selects conversion time based on voltage level and operational needs. During normal operation with sufficient voltage, a shorter conversion time is used to minimize power consumption and enable rapid response. When voltage drops below the reference level, the system automatically extends the conversion time to maintain measurement accuracy, ensuring proper current sensing under all operating conditions.
Solution Approach 2:
The system changes the conversion time parameter adaptively. A lookup table or register stores multiple conversion time values corresponding to different voltage levels. The controller selects the appropriate parameter based on real-time voltage monitoring, optimizing the balance between measurement accuracy and power consumption for each operating state.
4Use of energy by moving object
If a shorter conversion time is used, then power consumption is reduced and response speed is improved, but current sensing accuracy deteriorates
Solution Approach 1:
The patent uses dynamic conversion time adjustment based on voltage conditions. When the power supply voltage is above the reference level, the system employs a shorter conversion time to reduce power consumption and improve response speed. When voltage falls below the reference level, the conversion time is extended to maintain adequate measurement accuracy, ensuring the system adapts to available power conditions.
Solution Approach 2:
The system changes the conversion time parameter based on voltage level monitoring. Pre-configured lookup tables or registers provide appropriate conversion time values for different voltage conditions. The controller selects the optimal parameter dynamically, achieving the best balance between power efficiency and measurement precision for each operating state.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a power management circuit which supplies a power supply voltage to the plurality of pixels through a power supply line, a current sensing circuit which generates a digital current code by sensing a panel current flowing through the power supply line, and a controller which determines a peak gray level and a panel load by analyzing input image data, determines a voltage level of the power supply voltage based on the peak gray level and the panel load, and sets a conversion time, during which the panel current is converted into a digital current code, based on the voltage level of the power supply voltage.