Display Power Supply Switching for Ripple and Fault Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face issues with power supply voltage ripples when using external power supply circuits, leading to inefficiencies and potential damage during abnormal events due to delayed voltage deactivation.
Innovation Solution
A display device incorporating a low-dropout circuit to generate internal power supply voltage and a load switch circuit to selectively provide external power supply voltage, controlled by a controller to manage power distribution and voltage activation/deactivation based on enable signals, reducing or blocking external voltage during abnormal events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If external power supply circuit is used to generate power supply voltage, then power consumption is reduced, but voltage ripples occur
Solution Approach 1:
The patent implements dynamic power supply mode switching between internal and external power supply circuits based on operational requirements. The controller dynamically selects the appropriate power supply mode (first mode using internal circuit, second mode using external circuit) to optimize both power consumption and voltage stability during different operating phases.
Solution Approach 2:
The patent introduces an internal power supply circuit as an intermediary component between the external power supply circuit and the pixels. This internal circuit acts as a buffer that filters voltage ripples from the external power supply, thereby maintaining voltage stability while still benefiting from the power efficiency of the external circuit.
2Loss of energy
If external power supply voltage is continuously provided, then power efficiency is maintained, but damage occurs during abnormal events due to delayed voltage deactivation
Solution Approach 1:
The patent implements preliminary protective action by rapidly deactivating the external power supply voltage when an abnormal event is detected. The controller is configured to quickly turn off the external power supply circuit in response to abnormal conditions (such as overcurrent or overheating), preventing damage before it can propagate through the system.
Solution Approach 2:
The patent establishes a feedback mechanism where the controller continuously monitors the operating state of the display device and adjusts the power supply mode accordingly. When abnormal conditions are detected through sensing circuits, the controller receives feedback and automatically switches from the power-efficient external power supply mode to a protected state, thereby maintaining both efficiency and reliability.
3Stability of the object's composition
If internal power supply circuit is used to generate power supply voltage, then voltage stability is improved, but power consumption increases
Solution Approach 1:
The patent employs dynamic switching between internal and external power supply circuits based on real-time operational requirements. The controller dynamically selects the first power supply mode (using internal circuit for stability) or second power supply mode (using external circuit for efficiency) depending on the operational phase and system state, thereby optimizing the trade-off between voltage stability and power consumption.
Solution Approach 2:
The patent implements periodic switching between different power supply modes during operation. During certain phases (such as sensing periods or power-on periods), the internal power supply circuit is activated to provide stable voltage, while during other phases (normal driving periods), the external power supply circuit is used for efficiency. This periodic alternation ensures both stability and energy efficiency.
Data Source
AI summary
A display device includes a display panel including pixels, a low-dropout circuit configured to generate an internal power supply voltage in response to a low-dropout enable signal, and to provide the internal power supply voltage to the pixels through a power supply line, a load switch circuit configured to receive an external power supply voltage, and to selectively provide the external power supply voltage to the power supply line in response to a load switch enable signal, and a controller configured to generate the low-dropout enable signal and the load switch enable signal.