Display Mode Switching Voltage Control for Seamless AOD Transition
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Solution Overview
Problem
The switching between different power sources for display modes in electronic devices often results in a rush current component, leading to abnormal screens when transitioning from normal mode to Always On Display (AOD) mode, and existing solutions like intentionally outputting a black screen fail to provide a seamless transition.
Innovation Solution
An electronic device with a display panel, a first power regulator, a display driver integrated circuit (DDI), and a processor that controls the power regulators to maintain specific voltage values and prevent short detection functions during mode switching, ensuring seamless power transitions between normal and AOD modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power sources are switched between normal mode and AOD mode, then power consumption is optimized for different display requirements, but rush current occurs causing abnormal screen output
Solution Approach 1:
The patent applies preliminary action by maintaining the voltage of the second power source higher than the first power source before switching occurs. This pre-positioning of voltage levels prevents rush current when transitioning from normal mode to AOD mode, as the display panel is already prepared to accept the higher voltage without current spikes.
Solution Approach 2:
The patent changes the voltage parameter relationship between power sources. Specifically, it maintains the voltage of the second power source (for AOD mode) higher than the first power source (for normal mode) during transitions. This parameter inversion prevents the rush current issue while enabling seamless mode switching.
2Reliability
If black screen is output during mode switching, then rush current is prevented, but seamless transition between screens is lost
Solution Approach 1:
The patent prepares the second power source in advance by maintaining its voltage higher than the first power source before the mode switch. This preliminary voltage positioning allows the display to transition seamlessly from normal mode to AOD mode without showing a black screen, as the display panel is already ready to accept the AOD power levels.
3Ease of operation
If voltage of second power source is maintained higher than first power source, then seamless switching is achieved, but short detection function may incorrectly trigger during switching
Solution Approach 1:
The patent applies preliminary action by maintaining the voltage of the second power source higher than the first power source before switching occurs. This pre-positioning of voltage levels prevents rush current when transitioning from normal mode to AOD mode, as the display panel is already prepared to accept the higher voltage without current spikes.
Solution Approach 2:
The patent changes the voltage parameter relationship between power sources. Specifically, it maintains the voltage of the second power source (for AOD mode) higher than the first power source (for normal mode) during transitions. This parameter inversion prevents the rush current issue while enabling seamless mode switching.
Data Source
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AI summary
An electronic device includes a display panel, a first power regulator to supply first power to an anode of light emitting diode and to supply second power to a cathode of the light emitting diode, and a DDI including a second power regulator to supply third power to the anode of the light emitting diode and to supply fourth power to the cathode of the light emitting diode, and connected with the first power regulator, and a processor. The processor outputs first content based on the first power and the second power, in a first operating mode, outputs second content based on the third power and the fourth power, in a second operating mode, and controls the third power is maintained to be higher than the first power, and the fourth power is maintained to be higher than the second power when an operating mode is switched.