OLED Display Driving Method for Moving Image Clarity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices suffer from afterimages and blurred contours when displaying moving pictures due to their rapid response speed and low power consumption, leading to unclear object contours.
Innovation Solution
A display device and driving method that adjust the driving scheme according to different luminance sections, controlling the light emission timing through a light emission control signal with varying time intervals and duty ratios to improve display characteristics, specifically adjusting the front and rear points of the off level in the light emission control signal based on luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional driving scheme is used for organic light emitting display devices, then rapid response speed and low power consumption are achieved, but afterimages remain and object contours become blurred and unclear
Solution Approach 1:
The patent applies dynamics by making the light emission control signal adjustable and adaptable to different display conditions. The driving scheme dynamically changes the timing and duration of light emission control signals based on whether a moving picture or still image is being displayed, allowing the system to optimize between response speed and display clarity for different operational states
Solution Approach 2:
The patent implements periodic action through impulse driving where black frames are periodically inserted between image frames. This periodic black display period allows the organic light emitting material to fully turn off and reset, preventing afterimage accumulation while maintaining the rapid response characteristics during active display periods
2Device complexity
If the light emission control signal uses fixed timing intervals, then device complexity is reduced, but afterimages and blurred contours occur in moving pictures
Solution Approach 1:
The control signal timing is made dynamic rather than fixed. The patent adjusts the timing intervals of light emission control signals based on luminance sections and display content type (moving picture vs. still image), enabling the system to adapt to different conditions and eliminate afterimages without requiring complex additional hardware
3Reliability
If impulse driving scheme is implemented with adjusted time intervals in different luminance sections, then afterimages are reduced and display characteristics are enhanced, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the light emission control strategy based on luminance sections. Different time intervals and duty ratios are applied to different luminance regions (first, second, and third luminance sections), allowing optimized control for each local condition while using a unified overall driving architecture
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
The solution effectively reduces afterimages and improves the response level of the display device by optimizing the light emission timing and duty ratios, enhancing the clarity of moving images and reducing image degradation phenomena.
Implementation Method 1
An organic light emitting display device includes a light emitting element that may generate light through recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel having a pixel and a light emitting unit configured to output a light emission control signal controlling light emitting timing of the pixel. A luminance of the pixel has a first luminance section and a second luminance section different from the first luminance section. A first time interval between a rising edge of the light emission control signal and a rising edge of a vertical synchronization signal representing a start of the frame period is adjusted in the first luminance section and a second time interval between a falling edge of the light emission control signal and the rising edge of the vertical synchronization signal is adjusted in a second luminance section.