Operational Amplifier Output Path Switching for Fast Display Charging
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Solution Overview
Problem
Conventional solutions for reducing power consumption in display driving circuits, such as the pre-charge technique, become less effective as display resolution increases, leading to inadequate target voltage achievement due to shorter charging periods.
Innovation Solution
An operational amplifier with multiple output current paths and a selecting unit that couples the output node to various control nodes, allowing for adaptive selection of current paths based on input voltage levels, thereby optimizing power consumption without the need for pre-charge sub-periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the pre-charge technique is used to reduce power consumption, then power consumption is reduced, but the charging period becomes insufficient for high-resolution displays
Solution Approach 1:
The patent implements dynamic switching between different output current paths based on real-time voltage conditions. The output stage can adaptively select between a first current path (providing higher current for fast charging) and a second current path (providing lower current for power saving), allowing the system to optimize between charging speed and power consumption dynamically during the charging period
Solution Approach 2:
The patent changes the output current parameter by switching between different current paths with different current characteristics. By monitoring the output voltage and switching between current paths, the system adjusts the charging current parameter to achieve both power savings and adequate charging within the reduced charging period of high-resolution displays
2Productivity
If the charging period is reduced for high-resolution displays, then the display resolution is improved, but the pre-charge operation cannot achieve the target voltage in time
Solution Approach 1:
The patent applies preliminary action by using the selecting unit to determine the appropriate output current path before the charging operation begins. Based on the target voltage requirement and current state, the system pre-selects the optimal current path to ensure that the charging operation can achieve the target voltage within the limited charging period
Solution Approach 2:
The patent implements feedback control where the output voltage is continuously monitored and fed back to the selecting unit. Based on this feedback, the system dynamically adjusts the selection of output current paths to ensure the target voltage is achieved, maintaining reliability even with the reduced charging period
3Reliability
If the pre-charge time is increased to ensure target voltage achievement, then voltage achievement is improved, but the ratio of pre-charge time within each charging period becomes greater
Solution Approach 1:
The patent segments the charging operation into different phases by providing multiple output current paths. Instead of using a single long pre-charge period, the system divides the charging function into multiple current paths that can be switched between, allowing shorter, more efficient charging segments that achieve the same voltage target with better time utilization
Data Source
AI summary
An operational amplifier includes an output node; an output stage, comprising a plurality of output current paths and a plurality of control nodes, wherein the plurality of control nodes are respectively coupled to the plurality of output current paths, and the plurality of output current paths are coupled to the output node and respectively coupled to a plurality of power supply sources providing different voltages; and a selecting unit, configured to couple an internal output node of the operational amplifier to one of the plurality of control nodes of the output stage.