Light Shielding Layer Layout for In-Display Sensor Accuracy
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Solution Overview
Problem
Display devices face challenges in integrating sensors into the display region without reducing accuracy or resolution, while maintaining high display performance, especially with ultra-narrow borders.
Innovation Solution
The integration of a light detecting element within the display device, utilizing a substrate with a first and second metal layer having pinholes, a light shielding layer, and a transistor, which allows for improved light detection and enhanced display-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensors are embedded into the display region to achieve ultra-narrow borders, then the display-to-body ratio is improved, but the accuracy or resolution of the sensors may be reduced
Solution Approach 1:
The sensor structure is divided into multiple functional layers including a substrate, light shielding layer, transistor layer, and light detecting element layer. This segmentation allows each layer to perform its specific function optimally while maintaining compact integration within the display region, thus achieving both high display-to-body ratio and sensor accuracy.
Solution Approach 2:
The patent transitions from planar sensor integration to a three-dimensional stacked architecture where the light detecting element is positioned above the substrate with light shielding layer and transistor integrated below. This vertical arrangement in another dimension enables compact integration that maintains both small footprint for ultra-narrow borders and sufficient detection area for high accuracy.
2Length of moving object
If sensors are embedded into the display region, then the border width is reduced, but the display performance may be compromised
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the light detecting element and the transistor/substrate. This light shielding layer prevents stray light from reaching the transistor and interfering with the light detection process, thereby maintaining display performance while enabling sensor integration within the display region for reduced border width.
Solution Approach 2:
The light shielding layer is strategically positioned only in specific regions where it is needed to block stray light paths, rather than covering the entire display area. This localized approach maintains display performance in visible regions while providing necessary light blocking for sensor accuracy in the integrated sensor region.
3Device complexity
If the light detecting element is integrated with the substrate and metal layers, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The integrated structure is segmented into distinct fabrication stages where the substrate and metal layers are formed first, followed by the light shielding layer, and finally the light detecting element. This segmentation allows each layer to be manufactured and aligned independently with reference to the underlying layers, reducing the cumulative alignment complexity that would arise from attempting to form all layers simultaneously.
Solution Approach 2:
The substrate, metal layers, and light shielding layer are prepared and positioned in advance before the light detecting element is formed. This preliminary action establishes precise reference structures that guide the subsequent formation of the light detecting element, thereby reducing the manufacturing precision requirements during the final assembly stage.
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 enhances the accuracy and resolution of the light detecting element while reducing the display device's border, allowing for effective embedding of sensors within the display region without compromising display performance.
Implementation Method 1
a light detecting element for detecting a light passing through the first hole and the second hole
Implementation Method 2
a light shielding layer, disposed between the substrate and the transistor
Data Source
AI summary
An electronic device is disclosed, which includes: a substrate; a first metal layer, disposed on the substrate and having a first hole; a second metal layer, disposed on the substrate and having a second hole; a light detecting element for detecting a light passing through the first hole and the second hole; a transistor, disposed on the substrate; and a light shielding layer, disposed between the substrate and the transistor.