OLED Frame Rate Synchronization Without Emission Duty Flicker
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Solution Overview
Problem
Existing display devices employing impulse driving methods in organic light emitting displays face issues with frame rate inconsistencies leading to phenomena like tearing and stuttering, and flicker due to varying emission duty ratios when frame rates are adjusted.
Innovation Solution
An organic light emitting display device that maintains a constant emission duty ratio by synchronizing panel driving frames with image frames using an impulse driving method, adjusting frame rates according to image characteristics while ensuring the emission duty ratio remains unchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame rate of the panel driving frame is changed to match the frame rate of the image frame, then image quality is improved by preventing tearing and stuttering, but emission duty ratio varies causing perceivable flicker
Solution Approach 1:
The patent applies dynamics by making the emission period adjustable rather than fixed. The emission period is dynamically changed based on the frame rate of the image frame while maintaining a constant emission duty ratio. This allows the display device to adapt to varying image frame rates (resolving tearing and stuttering) while keeping the emission duty ratio constant (preventing flicker), thus resolving the technical contradiction between image quality and flicker reduction.
Solution Approach 2:
The patent changes the emission period parameter in response to image frame rate changes. By adjusting the emission period while maintaining a constant emission duty ratio, the system can synchronize with different image frame rates without causing flicker. This parameter change approach allows the display device to match various image frame rates while preventing the emission duty ratio from varying, thereby resolving the contradiction between improving image quality and preventing flicker.
2Object-affected harmful factors
If the emission duty ratio is maintained constant for each panel driving frame, then perceivable flicker is prevented, but frame rate synchronization becomes more complex
Solution Approach 1:
The patent employs feedback by continuously monitoring the image frame rate and adjusting the emission period accordingly. The system receives feedback about the image frame rate from the source device and uses this information to dynamically adjust the emission period while maintaining a constant emission duty ratio. This feedback mechanism simplifies the synchronization process by providing a clear control strategy: adjust emission period based on image frame rate while keeping emission duty ratio constant, thus preventing flicker without excessive complexity.
3Speed
If related art synchronization technology is applied to impulse driving method, then frame rate matching is achieved, but emission duty ratio differs for each panel driving frame causing flicker
Solution Approach 1:
The patent applies dynamics by making the emission period adjustable rather than fixed. The emission period is dynamically changed based on the frame rate of the image frame while maintaining a constant emission duty ratio. This allows the display device to adapt to varying image frame rates (resolving tearing and stuttering) while keeping the emission duty ratio constant (preventing flicker), thus resolving the technical contradiction between image quality and flicker reduction.
Solution Approach 2:
The patent changes the emission period parameter in response to image frame rate changes. By adjusting the emission period while maintaining a constant emission duty ratio, the system can synchronize with different image frame rates without causing flicker. This parameter change approach allows the display device to match various image frame rates while preventing the emission duty ratio from varying, thereby resolving the contradiction between improving image quality and preventing flicker.
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
Prevents or reduces perceivable flicker by maintaining a consistent emission duty ratio across panel driving frames, providing high-quality images by synchronizing frame rates effectively.
Implementation Method 1
an organic light emitting diode that emits light in response to an emission on-off clock
Data Source
AI summary
An organic light emitting display device comprising: a source device configured to output image data; and a sink device configured to perform a displaying operation based on the image data, wherein the source device is configured to change a frame rate of an image frame composing the image data while the displaying operation is performed, wherein the sink device is configured to change a frame rate of a panel driving frame for the displaying operation as the frame rate of the image frame is changed, and wherein the source device is configured to change the frame rate of the image frame while satisfying a condition in which an emission duty ratio of the panel driving frame is not changed.