Display Substrate Wiring Layout to Reduce In-Screen Sensor Diffraction
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Solution Overview
Problem
Existing display substrates with in-screen sensors face challenges in achieving high transmittance and image quality due to data and gate lines blocking light and causing diffraction, leading to reduced image output by the sensor.
Innovation Solution
The display substrate design includes a first display region with reduced pixel density and signal lines that extend and wind around the display region, using connecting wires and multiple pixel circuits to drive light emitting elements, while keeping sensor lines transparent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data and gate lines are placed in the first display region to drive light emitting elements, then the display function is achieved, but light transmittance is blocked and diffraction occurs reducing sensor image quality
Solution Approach 1:
The display region is divided into a first display region for light emitting elements and a second display region for pixel circuits. Signal lines are routed through the second display region to avoid blocking light in the first display region, while still providing driving signals to all light emitting elements.
Solution Approach 2:
The patent utilizes the second display region (surrounding the first display region) as an additional spatial dimension for routing signal lines. This allows signal lines to extend in a winding manner through the second display region, providing driving signals without occupying space in the first display region where light transmission is critical.
2Manufacturing precision
If pixel density is increased to improve display resolution, then more light emitting elements are packed, but signal lines occupy more space blocking light and increasing diffraction
Solution Approach 1:
The patent segments the functional areas: the first display region contains only light emitting elements for maximum light transmission and display resolution, while the second display region contains pixel circuits and serves as the routing path for signal lines. This segmentation allows high pixel density in the first display region without signal line interference.
Solution Approach 2:
The second display region acts as an intermediary zone that mediates between the need for high-resolution display (first display region) and the need for signal distribution. By placing pixel circuits and routing signal lines through this intermediary second display region, the patent enables high pixel density without compromising light transmission.
3Device complexity
If signal lines are routed directly through the display region, then wiring is simplified, but diffraction increases and image quality deteriorates
Solution Approach 1:
The signal lines are designed with winding portions that extend in a curved, non-linear manner through the second display region. This winding routing avoids straight lines that would pass through the first display region, reducing diffraction while still providing electrical connection between pixel circuits and light emitting elements.
Solution Approach 2:
Instead of routing signal lines directly through the first display region (two-dimensional straight path), the patent utilizes the surrounding second display region to create a winding three-dimensional routing path. This increases the routing length but avoids diffraction by keeping signal lines out of the light transmission path.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a display region, at least one first signal line, and at least one connecting wire. The display region includes a first display region and a second display region; the first display region includes at least one first light emitting element, and the second display region includes at least one first pixel circuit; the first signal line includes a first main body portion and a first winding portion; the first main body portion extends along a first direction, and at least part of the first winding portion extends along a direction intersecting with the first direction; at least one first signal line is electrically connected to at least one first pixel circuit; and at least one first pixel circuit is configured to respectively drive at least one first light emitting element.