Display Substrate Pixel Layout for Under-Screen Camera Regions
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Solution Overview
Problem
In the 'under-screen camera' solution for display apparatuses, achieving high screen occupation ratio while maintaining adequate light transmittance and display effect at the camera position is challenging due to the limitations of existing pixel driving circuit arrangements, which often result in reduced pixel density and compromised display quality.
Innovation Solution
A display substrate with a first display region having higher light transmittance than a second region, featuring a pixel driving circuit integrated within the sub-pixels in the first region, utilizing transparent conductive wires for electrical connections, and optimized transistor and capacitor layouts to minimize occupied area and ensure effective light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel driving circuit is arranged outside the display region, then the light transmittance of the display region is improved, but the screen occupation ratio is reduced and the pixel density is lowered
Solution Approach 1:
The pixel driving circuit is merged with the display region by integrating it within the sub-pixel structure. The driving circuit components (transistors, capacitors) are arranged within the same pixel area, allowing the display region to serve dual functions of light emission and signal processing, thereby increasing screen occupation ratio while maintaining light transmittance through transparent conductive wire connections
Solution Approach 2:
The patent transitions from a planar arrangement where driving circuits are separated from display regions to a three-dimensional integration within the sub-pixel structure. By utilizing vertical stacking and in-pixel arrangement of circuit components, the design achieves higher integration density without compromising the optical path, effectively increasing screen occupation ratio while preserving light transmittance characteristics
2Productivity
If the pixel driving circuit is integrated within the sub-pixel, then the screen occupation ratio is improved, but the area available for light emission is reduced
Solution Approach 1:
The sub-pixel is segmented into distinct functional zones: the light emission area occupied by the light-emitting element and the driving circuit area occupied by transistors and capacitors. This segmentation allows optimized spatial arrangement where transparent conductive wires efficiently connect circuit components to the light-emitting element, minimizing the impact of circuit area on overall light emission while maintaining high screen occupation ratio
Solution Approach 2:
Different regions within the sub-pixel are assigned different optical properties: the light-emitting element region maintains high transparency for light emission, while the driving circuit region uses transparent conductive materials that are optically invisible. This local differentiation ensures that the driving circuit integration does not significantly reduce the effective light emission area, as the circuit components are rendered optically transparent or positioned to minimize light blocking
Data Source
AI summary
A display substrate, a display panel and a display apparatus are provided. The display substrate includes: a first display region and a second display region, and a light transmittance of the first display region is greater than a light transmittance of the second display region. The display substrate includes: a base substrate; and a plurality of sub-pixels arranged on the base substrate and located in the first display region. The sub-pixel includes a first pixel driving circuit and a first light-emitting device. The first pixel driving circuit is electrically connected to the first light-emitting device and configured to drive the first light-emitting device to emit light. The pixel driving circuit includes a storage capacitor and a plurality of transistors, and the storage capacitor and the plurality of transistors included in the first pixel driving circuit are located in the first display region.