Display Panel Subpixel Electrode Overlap for Luminance Stability
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Solution Overview
Problem
Organic light emitting display devices experience luminance deviation between subpixels due to temperature changes, affecting image quality.
Innovation Solution
The display device and panel design include a configuration where the conductive electrode overlaps the source electrode of the driving transistor for some subpixels, adjusting the capacitance to mitigate luminance variation ranges based on temperature, thereby reducing luminance deviation between subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive electrode is positioned to overlap the source electrode of the driving transistor for some subpixels, then the luminance deviation between subpixels due to temperature change is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by differentiating the electrode configuration across different subpixels. Specifically, first and second subpixels are configured with conductive electrodes that overlap the source electrode of driving transistors, while third subpixels are configured without such overlapping electrodes. This localized structural differentiation compensates for temperature-induced luminance variations in specific subpixels, thereby improving overall luminance consistency without requiring complete redesign of all subpixel structures.
2Reliability
If the capacitance of the driving transistor is changed to mitigate luminance deviation, then the luminance variation range is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by modifying the capacitance characteristics of driving transistors in specific subpixels through structural modifications to the conductive electrode configuration. By positioning conductive electrodes to overlap with source electrodes in first and second subpixels, the capacitance values are adjusted to compensate for temperature-induced luminance variations. This approach achieves luminance stability through controlled parameter variation rather than requiring extreme manufacturing precision.
3Reliability
If different conductive electrode configurations are used for different subpixels, then the luminance deviation is mitigated, but the ease of manufacture decreases
Solution Approach 1:
The patent applies segmentation by dividing subpixels into different groups with distinct electrode configurations. First and second subpixels are segmented to include conductive electrodes overlapping the source electrode, while third subpixels are segmented to exclude such overlapping structures. This segmentation strategy allows for targeted compensation of temperature effects in specific subpixel groups, achieving luminance uniformity while maintaining a manageable fabrication process through modular design.
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 configuration effectively reduces luminance deviation between subpixels, enhancing image quality by adjusting the luminance variation range of specific subpixels in response to temperature changes.
Implementation Method 1
each of the plurality of first subpixels and the plurality of second subpixels includes a first conductive electrode positioned to overlap a first node of a first driving transistor driving a first light emitting element, over the first driving transistor
Data Source
AI summary
A display device includes a display panel including a plurality of first, second, third subpixels, a data driving circuit supplying data voltages to the display panel, a gate driving circuit supplying gate signals to the display panel, and a timing controller controlling the data driving circuit and the gate driving circuit. Each of the first subpixels and the second subpixels includes a first conductive electrode positioned to overlap a first node of a first driving transistor driving a first light emitting element, over the first driving transistor, a data voltage applied to the first node of the first driving transistor. The third subpixels include a second conductive electrode positioned to not overlap a first node of a second driving transistor driving a second light emitting element, over the second driving transistor, a data voltage applied to the first node of the second driving transistor.