Display Device with Recessed Planarization for Fingerprint Sensing
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Solution Overview
Problem
Existing display devices face challenges in improving accuracy for fingerprint sensing due to the region of light incident on the light sensor, which affects the precision of fingerprint recognition.
Innovation Solution
The display device design includes a recessed portion in the planarization layer with varying thicknesses and distances between the light sensor and light shielding layer to minimize the light incident area, enhancing the accuracy of fingerprint sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the opening of the light shielding layer is reduced or the region of the light sensor is increased, then the accuracy of fingerprint sensing is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a recessed portion in the planarization layer to create vertical distance between the light sensor and light shielding layer, transforming a two-dimensional planar arrangement into a three-dimensional structure. This dimensional change allows the light sensor to be positioned closer to the display surface while maintaining adequate separation from the light shielding layer, thereby improving fingerprint sensing accuracy without increasing device complexity
Solution Approach 2:
The planarization layer is designed with varying thickness, creating a recessed portion specifically at the light sensor region while maintaining uniform thickness in other areas. This localized structural modification enables precise control of the light incident area on the sensor without affecting the overall device structure, thus improving measurement precision without adding device complexity
2Measurement precision
If the distance between the light sensor and light shielding layer is increased, then the light incident area is reduced and fingerprint sensing accuracy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent introduces a planarization layer with a recessed portion as an intermediary structure between the light sensor and light shielding layer. This intermediary enables precise control of the vertical distance without requiring direct positioning between the sensor and shielding layer, thereby reducing manufacturing precision requirements while achieving the desired light incident area reduction
Solution Approach 2:
The patent controls the distance between the light sensor and light shielding layer by adjusting the depth of the recessed portion in the planarization layer. This parameter change approach allows flexible optimization of the light incident area and fingerprint sensing accuracy through a single controllable parameter (recessed portion depth) rather than coordinating multiple dimensional parameters
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 reduces the light incident area on the sensor, allowing for more precise fingerprint recognition without significantly reducing the light received by the sensor, thereby improving overall accuracy.
Implementation Method 1
a photoelectric conversion layer disposed on the first electrode
Data Source
AI summary
A display device and a method of manufacturing the same are provided. A display device comprises a substrate, a first planarization layer disposed on the substrate, the first planarization layer including a recessed portion recessed from an upper surface of the first planarization layer, a first electrode disposed on an upper surface and side surfaces of the recessed portion formed in the first planarization layer, a pixel electrode disposed on the upper surface of the first planarization layer to be spaced apart from the first electrode, a photoelectric conversion layer disposed on the first electrode, and a light-emitting layer disposed on the pixel electrode.