Adaptive Bias Voltage Control for Electroluminescent Display Power Optimization
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Solution Overview
Problem
Existing electroluminescent display matrix screens face high electric power consumption due to fixed or variable bias voltage settings in column control circuits, which are not optimized for aging light-emitting diodes, leading to suboptimal power savings.
Innovation Solution
A device regulating the bias voltage of column control circuits using measurement circuits to determine the highest and lowest voltages among selected columns, with an adjustment circuit that dynamically adjusts the bias voltage based on comparison signals to maintain optimal operation while accounting for aging diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If bias voltage VPOL is increased to ensure sufficient luminance for aging light-emitting diodes, then luminance is maintained, but electric power consumption increases
Solution Approach 1:
The patent applies dynamics by making the bias voltage VPOL adjustable and adaptive rather than fixed. The control circuit dynamically modifies VPOL based on detected luminance levels and aging characteristics of the light-emitting diodes, allowing the system to optimize between maintaining sufficient luminance and reducing power consumption over time
Solution Approach 2:
The patent implements feedback through measurement circuits that continuously monitor the luminance output and column voltages. This feedback information is used by the control circuit to automatically adjust the bias voltage VPOL, creating a closed-loop system that adapts to aging diodes while minimizing power consumption
2Ease of operation
If fixed bias voltage VPOL is used in column control circuits, then circuit operation is simplified, but power consumption is not optimized for aging diodes
Solution Approach 1:
The control circuit performs self-service by automatically detecting its own operating conditions (column voltages, luminance levels) and autonomously adjusting the bias voltage VPOL without external intervention. This maintains operational simplicity while enabling adaptive power optimization
Solution Approach 2:
The patent changes the parameter VPOL (bias voltage) dynamically based on detected conditions. The control circuit modifies this key parameter to adapt to aging light-emitting diodes, transitioning from a fixed parameter approach to a variable one that optimizes power consumption
3Use of energy by moving object
If variable bias voltage VPOL is implemented to optimize power consumption, then power savings are achieved, but insufficient security margin exists for aging diodes
Solution Approach 1:
The feedback mechanism continuously monitors luminance output and column voltages, providing real-time information about diode aging. This allows the system to increase VPOL when aging is detected, maintaining an adequate security margin while still optimizing power consumption during normal operation
Solution Approach 2:
The dynamic adjustment capability allows the system to transition from conservative initial settings to optimized settings as diodes age, and vice versa. This dynamic behavior ensures both power efficiency and reliability by adapting VPOL to the actual state of the light-emitting diodes
Data Source
AI summary
A device for regulating the bias voltage of circuits for controlling columns of a matrix display capable of selecting columns to turn on the light-emitting diodes of the selected columns and of a selected line, the device including a first measurement circuit providing a first measurement signal representative of the highest voltage among the voltages of the selected columns; a second measurement circuit providing a second measurement signal representative of the lowest voltage among the voltages of the selected columns; and an adjustment circuit receiving the first and second measurement signals and capable of decreasing the bias voltage if the first measurement signal is smaller than a first comparison signal and of increasing the bias voltage if the second measurement signal is greater than a second comparison signal.