OLED Display Substrate Local Density for Under-Screen Camera
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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 comprising multiple display regions, where high-density regions have densely packed light emitting units and sub-pixel circuits, and low-density regions, such as the under-screen camera area, have a lower density of light emitting units to allow higher light transmittance, connected by data lines that ensure synchronized data signals across different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the density of light emitting units in the under-screen camera region is reduced to allow camera placement, then light transmittance is improved, but display brightness and current are reduced
Solution Approach 1:
The patent applies local quality by differentiating the density of light emitting units across different display regions. The under-screen camera region uses a first density that is lower than the second density used in other display regions, allowing optimized light transmittance where needed while maintaining high brightness in regions that do not require camera transparency.
2Use of energy by stationary object
If the density of light emitting units is reduced in the under-screen camera region, then light transmittance is improved, but display current is reduced
Solution Approach 1:
The patent implements local quality by assigning different light emitting unit densities to different functional regions. The under-screen camera region operates at a lower density to minimize current consumption while maintaining adequate brightness, whereas other regions use higher density to maximize display performance where full brightness is required.
3Reliability
If different densities of light emitting units are used in different regions, then light transmittance is improved in the camera region, but uniformity of display effect deteriorates
Solution Approach 1:
The patent resolves this contradiction by deliberately applying local quality - using different light emitting unit densities in different regions to optimize for their specific functions. The under-screen camera region prioritizes light transmittance with lower density, while other regions prioritize display brightness with higher density, creating a functionally optimized non-uniform display structure.
Solution Approach 2:
The patent applies equipotentiality by carefully designing the data line connection structures and compensation circuits to balance the electrical characteristics across regions with different light emitting unit densities, ensuring that despite the physical non-uniformity, the display effect achieves visual uniformity through electrical compensation.
4Shape
If the screen ratio is increased by using under-screen camera design, then the full screen display effect is improved, but the appearance design complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple regions with different light emitting unit densities - the under-screen camera region with first density and other regions with second density. This segmentation allows the screen to achieve a higher screen ratio with full-screen display effect while the internal structure is organized into manageable segments that simplify the overall design complexity.
Data Source
AI summary
A display substrate and a display device are provided. In the display substrate, a first display region includes a first light emitting unit column and a second light emitting unit column each connected with a column of first sub-pixel circuits; a second display region includes a third light emitting unit column and a fourth light emitting unit column each connected with a column of first sub-pixel circuit pairs; each second sub data line is connected with each second light emitting unit column, and each fourth sub data line is connected with each fourth light emitting unit column. The first sub-pixel circuits connected with the fourth light emitting unit column and the first sub-pixel circuits connected with the second light emitting unit column are located in different columns, and the second sub data line and the fourth sub data line are connected by a data line connection portion.