OLED Display Pixel Group Segmentation for RC Delay Reduction
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Solution Overview
Problem
Active matrix OLED display devices face challenges in efficiently displaying stereoscopic images without increasing driving frequency, leading to increased production costs and RC delays, especially as panel size and resolution increase.
Innovation Solution
The design includes first and second group pixels that emit light during different fields, with separate scan lines and power lines, allowing for concurrent light emission and reduced driving frequency, and the use of compensation lines to control transistor threshold voltage, optimizing scan periods and light emission durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size and resolution are increased, then the image quality and viewing area are improved, but the RC delay increases and image data programming becomes inefficient
Solution Approach 1:
The patent divides the display panel into multiple pixel groups (first group pixels and second group pixels) that are driven alternately. Each group has dedicated scan lines and power lines, allowing independent control and reducing the RC delay impact across the entire large panel by segmenting the driving sequence into manageable portions.
Solution Approach 2:
The patent implements periodic driving where first group pixels and second group pixels are scanned and driven in alternating periods. This periodic action allows the panel to maintain efficient programming by cycling through groups, preventing cumulative RC delay effects and enabling effective image data programming in large-resolution panels.
2Speed
If the driving frequency is increased to display stereoscopic images, then the image update speed is improved, but the production cost increases
Solution Approach 1:
The patent segments the pixel array into first and second group pixels that can be driven in alternating fields. This segmentation enables stereoscopic image display at lower driving frequencies by alternating between groups, reducing the required driver frequency and consequently lowering production costs while maintaining adequate image update speed for stereoscopic viewing.
Solution Approach 2:
The patent dynamically adjusts the driving sequence by alternating between first group pixels and second group pixels across different fields. This dynamic driving pattern enables efficient stereoscopic image display without requiring continuously high driving frequencies, balancing image update speed with cost-effectiveness.
3Speed
If the driving frequency is increased to display stereoscopic images, then the image update speed is improved, but motion artifacts increase
Solution Approach 1:
The patent divides pixels into alternating first and second groups that are driven in alternating fields. This segmentation reduces motion artifacts by lowering the required driving frequency for stereoscopic display, as each group can be updated at a relaxed pace while still achieving the necessary frame rate for comfortable viewing, thereby reducing visual discomfort and motion-induced artifacts.
Solution Approach 2:
The patent uses periodic alternating driving of first and second group pixels to achieve efficient stereoscopic image display. This periodic action smooths the update process and reduces the impact of high-frequency switching that causes motion artifacts, while maintaining sufficient image update speed through the alternating field mechanism.
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 motion artifacts, maximizes light emission duration, and allows for the production of large-sized display devices without increasing driving frequency, thereby lowering production costs and improving image display efficiency.
Implementation Method 1
an organic light emitting diode (OLED) display device, which displays an image by using organic light emitting diodes that generate light by recombination of electrons and holes
Data Source
AI summary
An OLED display device includes first and second group pixels that emit light during first and second fields, respectively; first and second scan lines respectively coupled to the first and second group pixels; and first and second power lines for respectively supplying first and second power voltages to the first and second group pixels. The first and second power lines are coupled with first electrodes of the respective storage capacitors of the first and second group pixels, and the first power voltage is supplied as a first level voltage for a first period during which the first group pixels concurrently emit light. The first and second power lines are coupled with first electrodes of the respective storage capacitors of the first and second group pixels, and the first power voltage is supplied as a first level voltage for a first period during which the first group pixels concurrently emit light.