LTPO Display Substrate With Under-Screen Fingerprint Sensor
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Solution Overview
Problem
Current display technologies face challenges in integrating under-screen fingerprint recognition with low-temperature polycrystalline oxide (LTPO) display panels, particularly in achieving effective power-saving and sensitive light-sensing capabilities.
Innovation Solution
A display substrate design that combines LTPO technology with under-screen fingerprint recognition, where the under-screen fingerprint recognition structure uses a photosensitive oxide as an inductive sensor, positioned on the same layer as the LTPO structure, without the cathode and organic light-emitting layers, allowing for light reflection and enhanced light-sensing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the under-screen fingerprint recognition structure includes the cathode layer and organic light-emitting layer, then the display area can be fully utilized, but the light-sensing ability is reduced due to light absorption by these layers
Solution Approach 1:
The display substrate is divided into a display area and a fingerprint recognition area. The fingerprint recognition area is further segmented to exclude the cathode layer and organic light-emitting layer, creating a dedicated zone for light sensing without interference from light-absorbing display components.
Solution Approach 2:
The cathode layer and organic light-emitting layer are extracted (removed) from the fingerprint recognition area structure. This extraction eliminates the light-absorbing elements that would interfere with the light-sensing capability of the oxide photosensitive element, allowing maximum light to reach the sensor.
2Use of energy by moving object
If traditional display structures are used without LTPO technology, then manufacturing is simpler, but power consumption is higher
Solution Approach 1:
The low-temperature polycrystalline oxide structure serves multiple functions: it acts as the transistor structure for the display panel and simultaneously serves as the base layer for the under-screen fingerprint recognition structure. This multi-functionality enables power-saving benefits without requiring completely separate manufacturing processes.
Solution Approach 2:
The patent employs low-temperature polycrystalline oxide technology which changes the manufacturing temperature parameters compared to traditional processes. This parameter change enables better integration with the fingerprint recognition structure while reducing overall power consumption of the display system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables improved light-sensing capability and power-saving by allowing more light to be reflected onto the inductive sensor, enhancing the sensitivity of fingerprint recognition while maintaining the power-saving benefits of LTPO technology.
Implementation Method 1
the oxide is a photosensitive element and is used as an inductive sensor of the under-screen fingerprint recognition structure
Implementation Method 2
light emitted from the display area is reflected to the under-screen fingerprint recognition structure in the fingerprint recognition area by a fingerprint
Data Source
AI summary
The present disclosure provides a display substrate including a display area and a fingerprint recognition area. The display area includes a low-temperature polycrystalline oxide structure, an organic light-emitting layer, a cathode layer, and an anode layer that are sequentially stacked. The fingerprint recognition area includes an under-screen fingerprint recognition structure. The low-temperature polycrystalline oxide structure and the under-screen fingerprint recognition structure are disposed on a same layer. The under-screen fingerprint recognition structure includes the cathode layer and the organic light-emitting layer.