Emission Control Driver Voltage Stabilization
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Solution Overview
Problem
Organic light-emitting display apparatuses face challenges in minimizing power consumption, particularly in portable electronic devices where reducing unnecessary power usage is crucial for battery efficiency.
Innovation Solution
The emission control driver is designed with a cascade structure of stages, each comprising a first circuit portion to generate control signals, a second circuit portion to control voltage levels, and a third circuit portion with a capacitor to maintain constant voltage, ensuring efficient emission control signal generation with reduced power consumption by minimizing capacitor charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the emission control driver uses conventional circuit design with multiple capacitors that charge and discharge frequently, then the emission control signals can be generated, but power consumption increases due to unnecessary capacitor charging and discharging
Solution Approach 1:
The patent changes the voltage parameter of the emission control signal from a conventional single-voltage design to a dual-voltage design (first voltage and second voltage). By applying different voltage levels at different time periods, the circuit optimizes capacitor charging/discharging cycles, reducing unnecessary energy consumption while maintaining proper emission control signal generation.
Solution Approach 2:
The patent implements periodic action by applying the first voltage during a first time period and the second voltage during a second time period. This periodic voltage switching optimizes the charging and discharging cycles of capacitors in the emission control driver, ensuring that energy is consumed only when necessary for signal transitions, thereby reducing overall power consumption.
2Reliability
If the emission control driver applies varying voltage levels to control emission timing, then precise emission control is achieved, but power consumption increases due to frequent capacitor charging and discharging
Solution Approach 1:
The patent changes the voltage parameter from a single fixed level to a time-varying dual-level system. By carefully selecting when to apply the first voltage and when to apply the second voltage, the circuit achieves precise emission timing control while minimizing the frequency and duration of capacitor charging/discharging events, thus reducing power consumption.
Solution Approach 2:
The patent applies preliminary action by pre-charging or pre-discharging capacitors to optimal voltage levels before emission events occur. The first voltage is applied during the first time period to prepare the circuit state, reducing the need for frequent subsequent charging/discharging cycles, thereby maintaining emission precision while lowering overall power consumption.
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 organic light-emitting display apparatuses by maintaining a constant voltage between electrodes, preventing unnecessary charging and discharging of capacitors, thereby minimizing power usage while maintaining stable emission control signals.
Implementation Method 1
The third circuit portion includes a first capacitor configured to maintain a substantially constant voltage between both electrodes while each of the plurality of stages outputs the emission control signal
Data Source
AI summary
An emission control driver includes: a plurality of stages having: a first circuit portion configured to generate a first control signal at a first node and a second control signal at a second node; a second circuit portion configured to control a voltage level of the first control signal; a third circuit portion configured to generate a third control signal based on the first control signal, the second control signal, and the second clock signal; a first output transistor configured to output a first voltage as the emission control signal in response to the first control signal; and a second output transistor configured to output a second voltage as the emission control signal, and wherein the third circuit portion comprises a first capacitor configured to maintain a substantially constant voltage between both electrodes while each of the plurality of stages outputs the emission control signal.