Display Power Supply Switching Control for OLED Voltage Reset
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Solution Overview
Problem
Display devices face issues when switching between high and low power supplies, leading to potential overload and damage due to slow power supply conversion, which can be noticeable to users and result in overcurrent protection or internal circuit damage.
Innovation Solution
A power control system that includes a power supply controller and a driving method to manage the switching between high and low power supplies by synchronizing the operation of power source units, ensuring a smooth transition without user recognition of the power supply conversion, using delay drivers, NAND and OR gates, and transistors to manage voltage levels and reset driving voltages of OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power supply is converted from high power supply to low power supply or vice versa, then power consumption is reduced or display performance is improved, but power supply conversion moment becomes recognizable by user eyes
Solution Approach 1:
The patent applies preliminary action by enabling the target power supply source unit before switching from the current power supply source unit. This ensures the target unit is ready to immediately take over, preventing any perceptible interruption or flicker during power supply conversion.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring uninterrupted power supply to the pixels during switching. The target power supply source unit is activated and stabilized before the current unit is deactivated, ensuring continuous operation without perceptible interruptions.
2Speed
If power supply conversion speed is increased, then user cannot recognize power supply conversion moment, but overload is generated to lower power supply causing OCP or internal circuit damage
Solution Approach 1:
The patent applies preliminary action by pre-enabling the target power supply source unit and allowing it to complete its start-up period before switching. This ensures the target unit is fully ready to handle the load immediately, enabling fast switching without overload risks.
Solution Approach 2:
The patent uses feedback by monitoring the power supply voltage level and using this information to control the switching timing. The switching is performed at a moment when the target power supply source unit has stabilized its output, as indicated by voltage level feedback, ensuring safe and rapid conversion.
3Use of energy by moving object
If power supply voltage level is changed during operation, then power consumption is optimized, but driving voltage of OLED needs to be reset to prevent display errors
Solution Approach 1:
The patent applies preliminary action by performing OLED driving voltage reset at the power supply switching moment. This timing ensures that the OLEDs are properly reinitialized when the power supply voltage level changes, preventing display errors while maintaining power optimization benefits.
Data Source
AI summary
A display device includes a plurality of pixels and a power supply controller that includes a first power supply source unit supplying a high power supply voltage, and a second power supply source unit supplying a low power supply voltage. The high power supply voltage is different from the low power supply voltage. The power supply controller connects one of the first and second power supply source units to the plurality of the pixels. The one of the first and second power supply source units is switched to another of the first and second power supply source units at a switching time, at which the one of the first and second power supply source units stops operation.