OLED Brightness Control via Dynamic Emission Time Division
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Solution Overview
Problem
Organic light emitting displays face challenges in controlling brightness efficiently, leading to high power consumption and potential flickering phenomena due to varying emission areas and durations of light emission.
Innovation Solution
An organic light emitting display system that includes a brightness controller to restrict brightness based on emission area and a method to divide the emission time in a frame, reducing current usage and preventing flicker by adjusting emission control signals and power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large amount of current is supplied to produce bright light, then brightness is improved, but power consumption increases and requires high output capability from power source supply unit
Solution Approach 1:
The patent implements dynamic brightness control by adjusting the emission duration of OLEDs based on the calculated frame data magnitude. The emission control signals are dynamically modified to extend or reduce light emission time, allowing the system to maintain perceived brightness while reducing peak current requirements and overall power consumption.
Solution Approach 2:
The patent applies periodic emission control by dividing the light emission into multiple periods within a frame. By controlling the duration and timing of emission periods, the system can achieve desired brightness levels with reduced current demand compared to continuous high-current emission, thereby lowering power consumption.
2Use of energy by moving object
If the emission time is reduced to lower current usage, then power consumption is reduced, but flickering phenomenon occurs
Solution Approach 1:
The system dynamically adjusts emission control signals based on frame data magnitude to optimize the balance between power consumption and flicker prevention. When brightness restriction is applied, the emission duration is extended to specific periods within the frame, ensuring sufficient light output to avoid flicker perception while maintaining reduced power consumption overall.
Solution Approach 2:
The patent employs feedback mechanisms where the emission control unit receives brightness control signals based on frame data analysis and adjusts emission timing accordingly. This closed-loop control ensures that emission duration is optimized to prevent flicker while achieving power savings, adapting to different display content requirements.
3Use of energy by moving object
If brightness is restricted to reduce power consumption, then energy usage is reduced, but picture quality may deteriorate
Solution Approach 1:
The patent implements dynamic brightness management where the emission control duration is adjusted based on the magnitude of frame data. This allows the system to maintain high picture quality when brightness restriction is not needed while achieving power consumption reduction when restriction is applied, optimizing the trade-off between energy efficiency and image quality.
Solution Approach 2:
The system changes the temporal parameter of light emission by adjusting emission duration and timing based on frame data characteristics. This parameter modification allows brightness restriction to be implemented in a controlled manner that preserves picture quality by ensuring adequate emission time for proper image rendering while reducing overall energy 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 approach reduces power consumption and improves picture quality by controlling brightness according to emission area and time, minimizing flickering perceptions.
Implementation Method 1
The organic emission layer emits light by combining electrons and holes
Data Source
AI summary
An organic light emitting display includes a brightness controller that restricts the total brightness of a pixel unit when the number of pixels that emit bright light is greater than a predetermined level.