Emission Driver MOS Capacitor Power Reduction
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Solution Overview
Problem
Organic light emitting display devices face challenges in reducing power consumption, particularly in the emission driver component, which is crucial for applying these devices to battery-operated electronic devices.
Innovation Solution
The emission driver incorporates a metal-oxide-semiconductor (MOS) capacitor-based circuitry that utilizes a P-channel MOS transistor to manage light emission control signals, allowing for reduced power consumption by maintaining voltage levels and minimizing operation during logic high levels, thereby reducing power usage during pixel driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the emission driver continuously monitors and controls light emission signals using traditional circuitry, then the display maintains stable operation and control precision, but power consumption increases significantly
Solution Approach 1:
The emission driver operates in periodic cycles, switching between active monitoring mode and low-power standby mode. During each cycle, the driver actively controls light emission signals only when necessary, then enters a reduced-activity state, thereby maintaining display stability while significantly reducing average power consumption compared to continuous operation
Solution Approach 2:
The patent changes the operational parameters of the emission driver by dynamically adjusting control signal frequencies and voltage levels based on display content and user activity. This allows the driver to maintain reliable display operation during active periods while reducing power consumption during inactive periods through parameter optimization
2Measurement precision
If the emission driver uses active circuitry to maintain voltage levels for precise light emission control, then control precision is improved, but power consumption increases
Solution Approach 1:
The emission driver employs self-service mechanisms where the circuitry automatically maintains voltage levels and control precision without requiring continuous external power or active monitoring. The driver uses internal feedback circuits and voltage regulation components that self-correct and maintain precision while minimizing power consumption by operating only when necessary
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
This solution effectively reduces power consumption in the emission driver by minimizing the MOS capacitor's operation during logic high levels, leading to lower overall power consumption during pixel driving in organic light emitting display devices.
Implementation Method 1
maintain a voltage at the second node using a metal-oxide-semiconductor (MOS) capacitor
Data Source
AI summary
An emission driver includes light emission driving controllers that are electrically connected to light emission control lines. Each of the light emission driving controllers may include a first circuit block configured to provide a second voltage to a first node in response to a first clock signal and to output a first voltage as a light emission control signal based on a voltage at the first node and a second clock signal having a phase difference from a phase of the first clock signal; and a second circuit block configured to provide a synchronization signal to a second node in response to the first clock signal, to maintain a voltage at the second node using a metal-oxide-semiconductor (MOS) capacitor, and to pull down the light emission control signal to have the second voltage in response to the voltage at the second node.