Power Supply Voltage Shutdown Sequence for Display Reliability
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Solution Overview
Problem
Existing power supplies for display devices, such as LCDs and OLEDs, experience a reverse voltage phenomenon when shutting down, leading to damage and reliability failures due to inconsistent voltage fall orders and differences.
Innovation Solution
A power supply system comprising a logic voltage generator and a power voltage generator that control the output of voltages, ensuring a consistent power-off sequence by generating internal logic voltages and multiple power voltages based on an external input voltage, with a specific delay in cutting off the half drain voltage to prevent reverse voltage issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power supply is used, then power supply structure is simple, but voltage fall order is random causing reverse voltage phenomenon and reliability failure
Solution Approach 1:
The patent applies preliminary action by controlling the power supply to stop outputting drain voltage before stopping half drain voltage during power-off sequence. This predetermined voltage shutdown order prevents reverse voltage phenomenon before it can occur, ensuring reliability without requiring complex additional hardware components.
2Strength
If existing power supply is used, then manufacturing is simple, but voltage differentials are not maintained causing damage to display device
Solution Approach 1:
The patent implements preliminary action by pre-establishing a controlled shutdown sequence where drain voltage is stopped before half drain voltage. This predetermined sequence maintains proper voltage differentials throughout the power-off process, protecting the display device from damage without adding manufacturing complexity.
3Stability of the object's composition
If existing power supply is used, then power supply design is simple, but voltage outputs fall in random order causing reverse voltage phenomenon
Solution Approach 1:
The patent applies preliminary action by pre-defining the voltage shutdown sequence to stop drain voltage before half drain voltage. This predetermined control sequence ensures stable voltage outputs during power-off, preventing reverse voltage phenomenon while maintaining relatively simple power supply design.
Data Source
AI summary
A power supply and a display device using the same are provided. The power supply includes a logic voltage generator and a power voltage generator. The logic voltage generator generates an internal logic voltage based on an externally input voltage. The power voltage generator generates a plurality of power voltages based on the external input voltage. When the external input voltage is cut off, the power voltage generator stops outputting a drain voltage, and then stops outputting a half drain voltage.