Power Driver Voltage Selection for OLED Gate Driving
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Solution Overview
Problem
Conventional power drivers for OLED devices rely solely on battery voltage to generate driving voltages, leading to inefficiencies and increased power consumption, especially when the battery voltage range varies, and struggle to maintain stable voltage supply for high-resolution displays.
Innovation Solution
A power driver system that includes a first booster to generate an initial voltage from the battery, a voltage selector to switch between the battery-generated voltage and an external voltage after stabilization, and a second booster to produce the necessary driving voltages for the gate driver, with a waveform detector to determine optimal switching times, allowing efficient voltage management and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power driver relies solely on battery voltage to generate driving voltages, then the device complexity is reduced, but the stability of voltage supply deteriorates when battery voltage range varies
Solution Approach 1:
The power driver dynamically switches between two voltage generation modes: using battery voltage directly during initial operation, and transitioning to using the stabilized external voltage (ELVDD) after a predetermined time period. This dynamic adaptation resolves the contradiction by maintaining simplicity when possible while ensuring stability when needed.
Solution Approach 2:
The system changes the input voltage parameter from battery voltage to external voltage (ELVDD) after a predetermined time period. This parameter change allows the system to benefit from the stability of external voltage for high-resolution displays while maintaining the ability to operate with battery voltage initially, thus resolving the stability issue without requiring complex dual-power architectures.
2Ease of operation
If the power driver uses only battery voltage for voltage generation, then the ease of operation is improved, but the power consumption increases especially when battery voltage range varies
Solution Approach 1:
The power driver operates in two dynamic stages: initially using battery voltage for simple operation, then switching to external voltage (ELVDD) after a predetermined time period. This dynamic operation reduces power consumption during the main display operation phase by utilizing the already-stabilized external voltage, while maintaining ease of initial startup.
3Device complexity
If the power driver uses battery voltage directly, then the device complexity is reduced, but the display quality deteriorates due to ripple noises
Solution Approach 1:
The system dynamically transitions from using battery voltage (which causes ripple noises) to using external voltage (ELVDD) after a predetermined time period. This resolves the contradiction by eliminating ripple noises during the main display operation while keeping the overall device structure relatively simple through the use of a basic timing-based switching mechanism.
Solution Approach 2:
The system rushes through the initial phase using battery voltage quickly (within a predetermined time period) and then skips to using the cleaner external voltage for the majority of operation. This minimizes the exposure time to ripple noises while maintaining simple device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system stably and efficiently supplies driving voltages to the gate driver regardless of battery voltage range, reduces power consumption, and prevents display quality degradation from ripple noises, enabling the power driver to be embedded in high-resolution displays.
Implementation Method 1
a first booster receiving a voltage from a battery and generating a first voltage
Implementation Method 2
a second booster receiving an output of the voltage selector and generating a voltage necessary for the driving of the gate driver
Data Source
AI summary
A power driver for applying a voltage necessary for driving a gate driver for a display panel includes a first booster, a voltage selector, and a second booster. The first booster receives a voltage from a battery and generates a first voltage. The voltage selector selects one of the first voltage and a second voltage generated outside the power driver and applied to the display panel. The second booster receives an output of the voltage selector and generates a voltage necessary for the driving of the gate driver.