Integrated Ambient Light Sensor in Display Panel Functional Layer
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Solution Overview
Problem
The thickness of electronic devices with integrated fingerprint and ambient light sensors is excessive, leading to increased cost and space requirements due to the need for separate structures like flexible circuit boards to connect ambient light sensors to printed circuit boards.
Innovation Solution
A display panel design where the ambient light sensor is integrated within the functional device layer on the array substrate, alongside fingerprint and light-emitting devices, reducing overall thickness and eliminating the need for additional structures by manufacturing components in the same layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate structures like flexible circuit boards are used to connect ambient light sensors to printed circuit boards, then the ambient light sensor can be integrated into the display panel, but the thickness and space requirements of electronic devices increase
Solution Approach 1:
The patent merges the ambient light sensor with the display panel by forming the photosensitive layer within the functional device layer of the display panel structure. This integration eliminates the need for separate flexible circuit boards and additional connection structures, thereby reducing the overall thickness of the electronic device while maintaining the ambient light sensing function.
Solution Approach 2:
The patent transitions from a planar integration approach to a three-dimensional integration by positioning the photosensitive layer within the depth of the display panel structure (between different layers of the functional device layer). This vertical arrangement allows the sensor to be embedded within the panel thickness rather than adding external layers, effectively utilizing spatial dimensions to reduce overall device thickness.
2Adaptability or versatility
If separate structures like flexible circuit boards are used to connect ambient light sensors to printed circuit boards, then the ambient light sensor can be integrated into the display panel, but the production cost and space requirements increase
Solution Approach 1:
The patent combines multiple functions into a single integrated structure. The functional device layer simultaneously contains the display pixels and the ambient light sensor, eliminating the need for separate flexible circuit boards and additional connection components. This reduction in the number of parts simplifies the overall device architecture and lowers production complexity.
Solution Approach 2:
The functional device layer is designed to serve multiple purposes: it acts as both the display functional layer and the housing for the ambient light sensor. This multi-functionality eliminates the need for dedicated separate structures, reducing device complexity and the number of components required while maintaining both display and sensing capabilities.
3Length of stationary object
If components are manufactured in the same layer, then the overall thickness is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the functional device layer into distinct regions: a first region containing the photosensitive layer for ambient light detection and a second region containing the light-emitting devices for display. This spatial segmentation allows each component to be manufactured and positioned independently within the same layer, reducing the alignment precision requirements compared to integrating all components without regional division.
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 thickness of the display panel, simplifies manufacturing, lowers production costs, and conserves internal space by integrating sensors within the panel's structure, enhancing the display's adaptability to ambient light conditions.
Implementation Method 1
the first photosensitive device is configured to detect light, emitted by the light-emitting device, reflected by a finger
Implementation Method 2
the second photosensitive device is configured to detect an intensity of ambient light
Data Source
AI summary
Provided is a display panel, including: an array substrate and a functional device layer disposed on a bearing surface of the array substrate and including a first photosensitive device, a second photosensitive device, and a plurality of light-emitting devices. The first photosensitive device is configured to detect light, emitted by the light-emitting device, reflected by a finger, and includes a first photosensitive layer, a first electrode, and a second electrode. The second photosensitive device is configured to detect an intensity of ambient light and includes a second photosensitive layer, a third electrode, and a fourth electrode. The second photosensitive layer and the first photosensitive layer are disposed in a same layer. The third electrode and the first electrode are disposed in a same layer. The fourth electrode and the second electrode are disposed in a same layer.