OLED Panel Signal Line Layout for Uniform Display and Sensor Transmittance
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Solution Overview
Problem
Existing OLED display panels face issues with uneven display due to significant resistance differences between transparent and metal signal lines, leading to via hole defects and reduced light transmittance in regions with integrated optical sensors.
Innovation Solution
The display panel incorporates metal signal lines in specific types of signal lines, reducing resistance disparities and incorporating pixel circuit groups to minimize space, while overlapping light-emitting units with signal line projections to enhance light transmittance and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent signal lines are used in OLED display panels, then light transmittance is improved, but resistance increases causing via hole defects and display non-uniformity
Solution Approach 1:
The patent applies local quality by using transparent signal lines specifically in the optical sensor integration region where high light transmittance is critical, while using metal signal lines in other regions where low resistance is more important. This localized material selection optimizes both light transmittance and electrical performance in different functional areas of the display panel.
2Reliability
If metal signal lines are used, then resistance decreases improving electrical performance, but light transmittance is reduced
Solution Approach 1:
The patent implements local quality by strategically deploying metal signal lines in regions where electrical performance is prioritized over light transmittance, such as non-sensor areas. This spatial differentiation of signal line materials ensures optimal electrical conductivity where needed while preserving light transmission in optical sensor regions.
3Productivity
If pixel circuits are densely arranged to increase display resolution, then productivity is improved, but manufacturing precision decreases due to via hole defects
Solution Approach 1:
The patent applies local quality by using transparent signal lines in the optical sensor integration region, which reduces via hole defects in that specific area. This enables higher pixel density and improved display resolution without compromising manufacturing precision, as the transparent signal lines eliminate the via hole formation process in the critical sensor region.
4Adaptability or versatility
If optical sensors are integrated into the display panel, then functionality is improved, but light transmittance and display uniformity are reduced due to signal line resistance differences
Solution Approach 1:
The patent implements local quality by using transparent signal lines specifically in the optical sensor integration region, ensuring high light transmittance and display uniformity in that area. This localized approach allows optical sensor integration while maintaining optimal optical performance in the sensor region and electrical performance in other regions.
Data Source
AI summary
Provided is a display panel. The display panel includes a base substrate provided with a first display region; a plurality of pixel circuit groups disposed in the pixel circuit regions, wherein each pixel circuit group includes a plurality of pixel circuits and first signal lines of a plurality of types, a minimum distance between adjacent pixel circuit groups is greater than a minimum distance between adjacent pixel circuits in the pixel circuit group; the first signal lines of some types include metal signal lines, and the first signal lines of other types include transparent signal lines; and a plurality of light-emitting units, wherein an orthographic projection of at least part of the light-emitting units onto the base substrate is overlapped with orthographic projections of at least part of line segments in the first signal lines of the plurality of types onto the base substrate.