OLED Display Data Line Sharing for Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting diode (OLED) display devices face issues with luminance uniformity among red, green, and blue sub-pixels due to differences in driving features and data voltage charge rates, leading to image quality deterioration.
Innovation Solution
The OLED display device employs a Double Rating Driving (DRD) method, where adjacent sub-pixels sharing a data line are driven to reduce heat generation and improve luminance uniformity by lengthening the charge period of sub-pixels with lower charge rates, using a timing controller to align image data and generate control signals that synchronize gate and data voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If each sub pixel is driven independently with separate data lines, then each sub pixel can be charged at its optimal rate, but the number of data lines increases and heat generation increases
Solution Approach 1:
The patent merges the data lines for adjacent sub pixels by having two sub pixels share a single data line. This reduces the total number of data lines and simplifies the driving circuitry while implementing a double rating driving method that alternates between different charging rates for the paired sub pixels, thereby maintaining luminance uniformity despite the shared data line.
2Productivity
If all sub pixels are driven simultaneously, then the display refresh rate is maintained, but heat generation from the driving IC increases
Solution Approach 1:
The patent implements periodic action through double rating driving, where paired sub pixels are driven alternately at different charging rates in a periodic manner. This alternation allows the driving IC to operate at lower power during certain periods while maintaining the overall display refresh rate, thereby reducing heat generation without sacrificing productivity.
3Device complexity
If sub pixels with different charge rates are driven together, then luminance uniformity deteriorates, but driving all sub pixels at the same rate increases circuit complexity
Solution Approach 1:
The patent applies local quality by assigning different charging rates to different paired sub pixels based on their specific characteristics. Each pair of sub pixels shares a data line but can have customized charging rates tailored to their individual needs, allowing optimized performance for each local region while maintaining overall system simplicity through the shared data line 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
This approach reduces heat generated by control circuits, stabilizes the display, and improves image quality by minimizing differences in charge rates among sub-pixels, resulting in enhanced luminance uniformity and reduced image deterioration.
Implementation Method 1
the electron generated in the cathode and the hole generated in the anode of the organic light emitting diode are combined in the light emitting layer and emit light
Data Source
AI summary
Discussed is a display device including an organic light emitting diode display panel where sub pixels adjacent to each other along a direction of a gate line are paired and arranged to share a single data line. In order for the sub pixels to be driven according to a DRD method, a timing controller aligns image data and transmits the aligned image data to a data driver so that same-colored sub pixels continue to emit light based on a unit of a plurality of predetermined horizontal periods, and generates gate and data control signals and supplies the control signals to the gate and data drivers so that a predetermined driving period of the sub pixels is changed.