OLED Pixel Layout for High-Brightness Heat Dissipation
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Solution Overview
Problem
OLED displays used in outdoor or vehicle displays face significant heat dissipation challenges due to their large size and high brightness, leading to accelerated aging and reduced service life when operating at elevated temperatures.
Innovation Solution
The display device design includes a substrate with sub-pixels arranged in an array, where the orthographic projections of pixel opening regions and driving transistors, as well as storage capacitors, are partially or fully non-overlapping to minimize local heat concentration, ensuring a temperature rise of less than 15°C after two hours of continuous white display at room temperature and maintaining a luminance of at least 500 nit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED displays are designed with large size and high brightness for outdoor or vehicle use, then the luminance and visibility are improved, but heat dissipation becomes difficult leading to elevated operating temperatures
Solution Approach 1:
The pixel structure is segmented into distinct functional regions: light-emitting region, driving transistor region, and storage capacitor region. This spatial segmentation allows heat generated in the light-emitting region to be separated from the driving electronics, improving overall heat dissipation while maintaining high luminance output.
Solution Approach 2:
The patent transitions from a planar overlapping layout to a three-dimensional spatial arrangement where the orthographic projections of pixel opening regions, driving transistors, and storage capacitors are made non-overlapping. This dimensional reorganization creates independent thermal zones that facilitate heat dissipation while preserving display performance.
2Illumination intensity
If the display operates at high brightness for extended periods, then the visibility and display quality are improved, but the service life is reduced due to accelerated aging from heat
Solution Approach 1:
By segmenting the pixel structure into separate light-emitting and driving transistor regions with non-overlapping projections, the patent creates distinct thermal management zones. This allows the light-emitting region to operate at high luminance while the driving electronics are protected from excessive heat, thereby extending service life.
Solution Approach 2:
The patent introduces an intermediary spatial arrangement where the non-overlapping projection design acts as a thermal buffer between the heat-generating light-emitting region and the temperature-sensitive driving transistors. This intermediary configuration protects critical components from thermal degradation while maintaining display quality.
3Area of stationary object
If the pixel structure is designed with overlapping regions to improve space utilization, then the device area is reduced, but local heat concentration increases leading to poor heat dissipation
Solution Approach 1:
The patent applies segmentation by dividing the pixel structure into functionally independent regions with non-overlapping projections. The light-emitting region, driving transistor, and storage capacitor are spatially separated, which prevents heat concentration while maintaining efficient use of the display area through optimized regional arrangement.
Solution Approach 2:
The patent implements local quality by creating different spatial arrangements for different functional regions within the pixel. The light-emitting region is optimized for luminance output, while the driving transistor and storage capacitor regions are positioned to minimize heat concentration. This localized optimization allows the overall device to maintain compact area while avoiding harmful heat buildup in critical regions.
Data Source
AI summary
A display device includes a substrate and a plurality of sub-pixels arranged in an array on the substrate, and each of the plurality of sub-pixels includes: a drive unit including a driving transistor and a storage capacitor that are electrically connected; light-emitting devices including a pixel opening region, an orthographic projection of the pixel opening region on the substrate and an orthographic projection of the driving transistor on the substrate are at least partially non overlapping, and the orthographic projection of the pixel opening region on the substrate and an orthographic projection of the storage capacitor on the substrate are at least partially non overlapping; wherein the display device is configured as that, after continuously displaying a white picture at room temperature for two hours, a temperature rise of a display surface of the display device is less than or equal to 15° C.