OLED Display Substrate Layout for Higher Pixel Light Transmittance
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Solution Overview
Problem
Existing OLED display panels face challenges in ensuring high light transmittance and uniformity of light emission due to inconsistencies in the light emitting layer and interference from capacitance wires within the light emitting regions.
Innovation Solution
The display substrate design includes a capacitance wire arrangement outside the light emitting regions, reducing shielding effects and improving light transmittance, while incorporating a photosensitive circuit for optical compensation to enhance light emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance wire is arranged within the light emitting region to drive the sensing transistor, then the driving function is ensured, but the light transmittance is reduced due to shielding effect
Solution Approach 1:
The capacitance wire is moved from the light emitting region to the non-light emitting region, utilizing the spatial dimension outside the pixel aperture. This dimensional relocation allows the wire to perform its electrical function without interfering with light transmission through the pixel opening.
Solution Approach 2:
The capacitance wire is extracted from the light emitting region and repositioned in the non-light emitting region. This separation removes the harmful shielding effect from the optical path while preserving the wire's essential function of driving the sensing transistor.
2Illumination intensity
If the capacitance wire body portion is positioned outside the light emitting region, then light transmittance is improved, but the layout complexity increases
Solution Approach 1:
The capacitance wire is merged with the data line by arranging both conductors in the non-light emitting region. This consolidation reduces the number of separate routing paths and simplifies the overall layout while maintaining both functions.
Solution Approach 2:
The non-light emitting region serves multiple functions: it accommodates the capacitance wire for sensing transistor control and the data line for signal input. This multi-functional use of space improves light transmittance without significantly increasing complexity.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes: a plurality of pixel units arranged on a base substrate; a first conductive layer, a semiconductor layer, a second conductive layer and a pixel definition layer sequentially arranged on the base substrate. A pixel driving circuit includes a sensing transistor, a storage capacitance and a capacitance wire. A source electrode and a drain electrode of the sensing transistor are located in the second conductive layer, a second capacitance electrode of the storage capacitance and the capacitance wire are located in the first conductive layer. The capacitance wire includes a capacitance wire body portion extending in a second direction. For one same sub-pixel, an orthographic projection of the capacitance wire body portion of the pixel driving circuit thereof on the base substrate is spaced apart from that of the light emitting region thereof on the base substrate.