OLED Impulse Driving With Constant Emission Duty at Variable Frame Rates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices employing impulse driving methods in organic light emitting displays face issues with frame rate synchronization, leading to inconsistencies in emission duty ratios and perceivable flicker due to changes in frame rates.
Innovation Solution
An organic light emitting display device that adjusts the frame rate of image frames and panel driving frames using an impulse driving method, maintaining a constant emission duty ratio by controlling frame rates according to image characteristics and synchronizing driving timings, with frame rates of image frames calculated using the equation F=1/A×K, where F is the frame rate, A is the emission on-off clock cycle time, and K is an integer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the frame rate of image frames is changed according to image characteristics, then image display quality is improved, but the emission duty ratio becomes inconsistent causing perceivable flicker
Solution Approach 1:
The patent implements dynamic frame rate adjustment by synchronizing the panel driving frame rate with the image frame rate based on image characteristics. The driving timing is dynamically changed to match the variable frame rate, allowing the display to adapt to different image content requirements while maintaining stable emission duty ratio through coordinated timing adjustments.
Solution Approach 2:
The patent changes the driving timing parameter of the panel driving frame in synchronization with frame rate adjustments. By modifying the driving timing parameter alongside the frame rate, the system maintains consistent emission duty ratio while enabling variable frame rates for optimized image display quality.
2Speed
If the frame rate of image frames is increased for fast-changing images, then image smoothness is improved, but the emission duty ratio varies causing flicker
Solution Approach 1:
The patent employs feedback mechanisms where the frame rate is adjusted based on image characteristics, and the driving timing is simultaneously adjusted in response. This feedback loop ensures that when frame rate increases for fast-changing images, the driving timing is also optimized to maintain stable emission duty ratio and prevent flicker.
3Reliability
If related art synchronization technology is applied to impulse driving method, then frame rate synchronization is achieved, but emission duty ratio differs for each panel driving frame causing flicker
Solution Approach 1:
The patent combines frame rate synchronization technology with impulse driving method by integrating dynamic driving timing adjustment. This composite approach merges the advantages of both technologies, achieving frame rate synchronization while maintaining stable emission duty ratio through the additional layer of timing control specific to impulse driving.
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 constant emission duty ratio for each panel driving frame, ensuring high-quality image display by synchronizing frame rates and maintaining consistent luminance.
Implementation Method 1
an organic light emitting display device that employs an impulse driving method by which a self-luminous element (e.g., an organic light emitting diode, etc.) 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.