Display Panel With Integrated Fingerprint Sensing Region
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Solution Overview
Problem
Current display panels lack an efficient method for integrating fingerprint sensing capabilities while maintaining high display performance and manufacturing simplicity.
Innovation Solution
A display panel design incorporating light emitting regions and a sensing region with a pixel defining layer, where the light emitting elements and light sensing element are formed using organic materials, with the sensing region being partially surrounded by the light emitting regions, and both functional layers are formed by the same process, optimizing manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate manufacturing processes are used for light emitting regions and sensing regions, then manufacturing precision can be maintained, but device complexity and manufacturing time increase
Solution Approach 1:
The patent combines the manufacturing processes for light emitting elements and light sensing elements into a single integrated process. Both types of elements are formed simultaneously using the same organic material deposition and patterning steps, eliminating the need for separate manufacturing sequences while maintaining the distinct functional regions through the pixel defining layer structure.
Solution Approach 2:
The pixel defining layer serves multiple functions: it defines boundaries for both light emitting regions and sensing regions, provides structural support for both element types, and enables the formation of both functional layers through a single patterning process. This multi-functional design reduces overall device complexity while preserving manufacturing precision.
2Manufacturing precision
If light emitting regions are placed close to sensing regions, then display resolution increases, but separation gaps become too small affecting manufacturing
Solution Approach 1:
The pixel defining layer creates locally distinct regions with different properties: light emitting regions are defined with specific boundary characteristics while sensing regions have different boundary requirements. The layer provides localized structural support and definition where needed, allowing tight spacing between regions while maintaining manufacturability through differentiated local structures.
3Reliability
If multiple different materials are used for light emitting elements and sensing elements, then functional performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent uses the same organic material for both light emitting elements and light sensing elements. This homogeneous material approach simplifies the manufacturing process by eliminating the need for separate material deposition steps while still allowing the pixel defining layer to differentiate between light emitting and sensing functional regions through structural design rather than material composition.
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 effective fingerprint sensing while minimizing process complexity and separation gaps between light emitting regions, enhancing display resolution and manufacturing efficiency.
Implementation Method 1
a light emitting element disposed in the first opening and emitting light in response to an applied voltage
Implementation Method 2
a light sensing element disposed in the second opening and sensing a fingerprint by detecting light
Data Source
AI summary
Disclosed is a display panel which includes a base layer including a plurality of light emitting regions and a sensing region spaced apart from each other in a plan view, a plurality of light emitting elements that are disposed on the base layer and that overlap the plurality of light emitting regions, respectively, and a light sensing element that is disposed on the base layer and that overlaps the sensing region. The plurality of light emitting regions include a first light emitting region that emits light having a first wavelength, and at least a portion of the sensing region is surrounded by the first light emitting region in plan view.