Display Panel Current Sensing with Adaptive ADC Parameters
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Solution Overview
Problem
Display devices face issues with overcurrent flow and excess power consumption due to improper adjustment of luminance based on input image data, leading to potential damage and inefficiencies.
Innovation Solution
Implementing a controller that performs analog-to-digital conversion of panel current, adjusting conversion range, time, and sampling count based on dimming values to control luminance and manage power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the luminance of the display panel is not adjusted based on the load of input image data, then the display panel can maintain simple operation, but overcurrent flows into the display panel causing excess power consumption and potential damage
Solution Approach 1:
The system continuously monitors the actual luminance output of the display panel and compares it with the target luminance derived from image data load analysis. Based on this feedback, the controller dynamically adjusts the luminance to prevent overcurrent while maintaining optimal display performance, thereby protecting the panel without requiring overly complex control mechanisms
Solution Approach 2:
The controller changes the luminance parameter dynamically based on the load characteristics of input image data. By analyzing factors such as image brightness, contrast, and color depth, the system adjusts the luminance in real-time to match the actual power consumption requirements, preventing overcurrent while maintaining display quality
2Measurement precision
If a fixed analog-to-digital conversion range is used for panel current, then the conversion process is simple and fast, but the conversion precision is insufficient for both low and high current conditions
Solution Approach 1:
The analog-to-digital conversion range is made dynamic rather than fixed. The controller automatically adjusts the conversion range based on the detected panel current magnitude, selecting appropriate conversion parameters for low current, high current, or intermediate conditions. This dynamic adjustment ensures high measurement precision across all current levels while maintaining relatively simple conversion hardware
Solution Approach 2:
The system changes the analog-to-digital conversion parameters (such as reference voltage or bit depth allocation) based on the current conditions. By adapting these parameters to match the actual current range being measured, the system achieves optimal precision for each operating condition without requiring an overly complex conversion system
3Measurement precision
If the conversion time for panel current is increased to improve precision, then the measurement accuracy improves, but the response speed decreases affecting display performance
Solution Approach 1:
The conversion time is made dynamic rather than fixed. The controller adjusts the conversion duration based on the required precision level and current conditions. For high-precision measurements during critical moments, the system increases conversion time; for faster response requirements, it reduces conversion time while maintaining adequate precision through optimized parameters
Solution Approach 2:
The system performs conversion with varying degrees of precision depending on the situation. Instead of always using maximum precision conversion, the system applies partial conversion (shorter time) when sufficient precision is achieved quickly, and only uses excessive action (longer conversion time) when high precision is truly required, thereby balancing accuracy and speed optimally
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces current oscillation and power consumption, particularly during low and high current conditions, while enhancing the detection of rush currents and protecting the display device.
Implementation Method 1
a current sensing circuit which senses a panel current flowing through the power line and performs an analog-to-digital conversion for converting the panel current into a panel current code
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a power management circuit which provides a power voltage to the plurality of pixels through a power line, a current sensing circuit which senses a panel current flowing through the power line and performs an analog-to-digital conversion for converting the panel current into a panel current code, and a controller which sets at least one of a conversion range, a conversion time, or a conversion sampling count of the analog-to-digital conversion based on a dimming value for controlling a luminance of an image displayed by the display panel.