OLED Display Substrate Electrode Area Adjustment for Under-Screen Camera Brightness
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Solution Overview
Problem
In organic light emitting diode (OLED) display devices with under-screen camera designs, the display brightness and current in low-density display regions are significantly lower than in high-density regions, affecting the display effect.
Innovation Solution
A display substrate with a base substrate divided into first, second, and third display regions, where the second and third regions have lower light emitting unit densities than the first region, and the light emitting units in these regions are designed with larger main body electrodes to enhance brightness while maintaining the service life of luminescent materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the density of light emitting units in the second and third display regions is reduced to accommodate under-screen camera design, then the screen ratio is improved, but the display brightness and current in these regions become significantly lower than in the first display region
Solution Approach 1:
The patent applies local quality by differentiating the main body electrode area across different display regions. Specifically, light emitting units in the second and third display regions (with lower density) are configured with larger main body electrode areas compared to those in the first display region (high density). This local adjustment compensates for the reduced density by increasing the electrode area, thereby balancing the display brightness across all regions while maintaining the under-screen camera design's high screen ratio.
2Illumination intensity
If the main body electrode area is increased in low-density regions to enhance brightness, then the display uniformity is improved, but the service life of luminescent materials may be compromised
Solution Approach 1:
The patent applies parameter changes by adjusting the main body electrode area parameter specifically for light emitting units in the second and third display regions. By increasing the electrode area in these low-density regions, the patent compensates for the reduced unit density and achieves uniform display brightness across all regions, while carefully controlling the parameter changes to maintain luminescent material service life.
3Adaptability or versatility
If the light emitting unit density is reduced in the second and third display regions, then the under-screen camera function is enabled, but the display resolution and detail in these regions deteriorate
Solution Approach 1:
The patent applies local quality by creating different display region configurations: the first display region maintains high light emitting unit density for high-resolution display, while the second and third display regions use lower density with larger electrode areas. This local differentiation enables the under-screen camera function in the third display region while maintaining acceptable display quality through the compensated brightness.
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 increases the brightness of the second and third display regions, ensuring a more uniform full screen visual display effect without compromising the service life of the luminescent materials.
Implementation Method 1
each light emitting unit includes a first electrode, a light emitting layer, and a second electrode which are sequentially arranged along a direction perpendicular to the base substrate
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a first display region including first light emitting unit groups and first pixel circuit groups connected with the first light emitting unit groups, a second display region including second light emitting unit groups, second pixel circuit groups connected with the second light emitting unit groups and third pixel circuit groups, and a third display region including third light emitting unit groups connected with the third pixel circuit groups. Each light emitting unit group includes light emitting units of different colors. The light emitting unit includes a main body electrode, an area of the main body electrode of at least one color light emitting unit in the third display region is greater than that of a main body electrode of the same color light emitting unit in the first display region.