Display Device Optical Transmission Path for Fingerprint Sensor
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Solution Overview
Problem
Existing display devices face challenges in efficiently routing external light to a sensor layer, such as an optical fingerprint sensor, which is essential for stable operation.
Innovation Solution
The display device incorporates an optical transmission path utilizing first and second holes defined through the functional and pixel definition layers, respectively, allowing external light to reach the sensor layer disposed under the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor layer is disposed under the substrate to enable fingerprint sensing, then the sensing function is integrated into the display device, but external light cannot efficiently reach the sensor layer through the existing layer structure
Solution Approach 1:
The patent segments the functional layer and pixel definition layer by defining first holes through the functional layer and second holes through the pixel definition layer. These segmented openings create a light transmission path that allows external light to reach the sensor layer while maintaining the integrity of each layer's other functions.
Solution Approach 2:
The first holes and second holes act as intermediary structures that facilitate light transmission from the external environment through multiple layers to the sensor layer. These holes serve as mediators that enable communication between the external light source and the underlying sensor without compromising the functional integrity of the intermediate layers.
2Ease of manufacture
If holes are defined through the functional layer and pixel definition layer to create an optical transmission path, then external light can reach the sensor layer, but the structural integrity and sealing of the layers may be compromised
Solution Approach 1:
The second holes are disposed to overlap with the first holes, creating a nested alignment where the openings in different layers are vertically aligned. This nesting approach ensures that the light transmission path is precisely defined while minimizing the overall impact on structural integrity by concentrating the openings in specific regions rather than distributing them broadly.
Solution Approach 2:
The holes are defined in specific local regions (first areas in the non-pixel area) rather than uniformly across the entire structure. This localized approach allows the majority of the layer structure to maintain its integrity and sealing properties while providing sufficient light transmission paths in the specific regions where sensors are positioned.
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 configuration enables external light to easily reach the sensor layer, ensuring stable operation of the sensor and enhancing the overall functionality of the display device.
Implementation Method 1
The first holes, second holes, sub-color filters and first light transmission area form an optical transmission path for external light to reach the sensor layer
Data Source
AI summary
A display device includes a substrate comprising a plurality of pixel areas and a non-pixel area surrounding each of the plurality of pixel areas. The non-pixel area includes a plurality of first areas and a second area surrounding the plurality of first areas. A functional layer is disposed on the substrate and includes a plurality of first holes defined through the functional layer and overlapping the plurality of first areas. An element layer is disposed on the functional layer. A pixel definition layer is disposed on the element layer and overlaps the non-pixel area. The pixel definition layer includes pixel openings defined therethrough. The pixel openings overlap the plurality of pixel areas. A plurality of light emitting elements is disposed on the element layer and is disposed in the pixel openings.