Power Supply Module for Electronic Paper Display Voltage Segmentation
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Solution Overview
Problem
The existing driving devices for electronic paper displays require large voltage ranges for scan and data signals, leading to high power consumption and increased manufacturing costs due to the need for high-voltage transistors.
Innovation Solution
A power supply module that alternately outputs a source high voltage and a source low voltage in separate periods, using a common voltage between them, to generate data signals for pixels, thereby reducing the overall voltage range and power consumption, and allowing the use of transistors without high-voltage processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large voltage ranges are used for scan and data signals, then the transistors can control pixels effectively, but power consumption increases and manufacturing cost increases
Solution Approach 1:
The voltage supply is segmented into separate high voltage periods and low voltage periods. During high voltage periods, the full voltage range is applied for effective pixel control. During low voltage periods, reduced voltage is applied to minimize power consumption. This temporal segmentation allows the system to achieve both effective control and energy efficiency.
Solution Approach 2:
The power supply module operates periodically, alternating between high voltage output periods and low voltage output periods. This periodic action enables the driving device to maintain pixel control effectiveness during high voltage phases while reducing power consumption during low voltage phases, resolving the contradiction between reliability and energy use.
2Reliability
If large voltage ranges are used for scan and data signals, then the transistors can conduct effectively, but the number of high withstanding voltage transistors increases
Solution Approach 1:
The operating periods are segmented into high voltage periods and low voltage periods. During low voltage periods, standard transistors can handle the voltage requirements, reducing the need for high withstanding voltage transistors. During high voltage periods, the full voltage range is restored for effective conduction. This segmentation reduces overall device complexity while maintaining conduction effectiveness.
Solution Approach 2:
The voltage parameter is dynamically changed between high and low states based on operational requirements. By adjusting the voltage parameter periodically, the system can use standard transistors during low voltage periods instead of requiring all transistors to be high withstanding voltage types, thereby reducing device complexity while maintaining conduction effectiveness when needed.
3Reliability
If high voltage is maintained continuously, then pixel control is always effective, but power consumption increases
Solution Approach 1:
The power supply module implements periodic action by alternating between high voltage output and low voltage output. During high voltage periods, pixel control effectiveness is maintained. During low voltage periods, power consumption is reduced. This periodic switching resolves the contradiction by providing both high control effectiveness and energy efficiency at different times.
Solution Approach 2:
The voltage output is made dynamic rather than static, allowing the system to adjust between high and low voltage states based on operational needs. This dynamic adjustment enables the system to maintain pixel control effectiveness when required while reducing power consumption during periods when full voltage is not needed, resolving the contradiction between reliability and energy use.
Data Source
AI summary
A power supply module for a driving device of a display system includes a source power unit, for outputting a source high voltage only in a first period and outputting a source low voltage only in a second period according to a power control signal, wherein the source high voltage and the source low voltage are utilized for generating a plurality of data signals of a plurality of pixels in the display system; and a bias power unit, for generating a common voltage, wherein the common voltage is between the source high voltage and the source low voltage; wherein the first period does not overlap the second period.