Fingerprint Sensor Integrated in Display Backplane Electrode Layers
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Solution Overview
Problem
Current display apparatuses for fingerprint identification require complex structures and are prone to errors due to stray light interference, necessitating additional processes and rearrangement of metal traces, which complicates fabrication and reduces accuracy.
Innovation Solution
A display backplane with a simple structure that integrates a fingerprint identification sensor within the non-display region, using a thin film transistor array layer, capacitive electrode layers, and a light-emitting element, where the drive and sensing electrodes are formed in the same layers as the electrode layers, allowing for fingerprint identification without additional processing steps and minimizing bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal trace is rearranged under the display panel to capture more light for fingerprint identification, then light capture capability is improved, but the structure becomes complex and fabrication difficulty increases
Solution Approach 1:
The patent merges the fingerprint identification sensor with the display backplane structure. The drive electrode and sensing electrode of the fingerprint sensor are integrated into the same layers as the capacitive electrode layers (first and second electrode layers), eliminating the need for separate metal trace rearrangement and reducing structural complexity while maintaining light capture capability.
Solution Approach 2:
The capacitive electrode layers serve dual functions: they function as part of the display structure and simultaneously serve as the drive and sensing electrodes for the fingerprint identification sensor. This multi-functionality eliminates the need for separate dedicated fingerprint sensor components, simplifying the overall structure.
2Reliability
If additional process acts are added to achieve fingerprint identification, then fingerprint identification capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the fingerprint sensor electrodes with the existing capacitive electrode layers formed during standard display fabrication. The drive electrode and sensing electrode are formed in the same process steps as the first and second electrode layers, eliminating the need for additional process acts and reducing manufacturing complexity.
Solution Approach 2:
The fingerprint sensor electrodes are prepared in advance during the formation of the capacitive electrode layers, before final assembly. This preliminary integration ensures that no additional processing steps are needed later, simplifying the overall manufacturing process.
3Reliability
If the fingerprint identification region occupies display space, then fingerprint identification can be achieved, but the display region size is reduced and bezel width increases
Solution Approach 1:
The patent merges the fingerprint sensor with the display backplane structure, allowing the fingerprint identification region to be integrated within the non-display region rather than occupying display space. This integration enables the fingerprint sensor to coexist with the display region without reducing its size, facilitating narrower bezels.
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 solution enables accurate fingerprint identification without occupying display space, simplifies the fabrication process, and achieves a narrow bezel, while integrating the fingerprint sensor within the display backplane for improved commercial prospects and reduced thickness.
Implementation Method 1
a capacitive electrode layer including a first electrode layer and a second electrode layer, wherein the first electrode layer is disposed in a same layer as the gate, and the second electrode layer is disposed on a side of the first electrode layer away from the base substrate; a fingerprint identification sensor located in the fingerprint identification region, wherein a drive electrode and a sensing electrode in the fingerprint identification sensor are disposed in a same layer as the first electrode layer and the second electrode layer, respectively
Data Source
AI summary
Provided in the present application are a display backplane and a fabrication method therefor, a display panel and a display device. The display backplane is divided into a display region and a non-display region which is arranged surrounding the display region, the non-display region comprising a fingerprint recognition region. The display backplane comprises: a base substrate; a thin film transistor array layer provided at one side of the base substrate; a capacitive electrode layer, which comprises a first electrode layer and a second electrode layer; a light-emitting element which is provided at the side of the thin film transistor array layer away from the base substrate; and a fingerprint recognition sensor, which is located in the fingerprint recognition region. Moreover, a drive electrode and a sensing electrode are respectively arranged on the same layer as the first electrode layer and the second electrode layer in the capacitive electrode layer.