Multi-Resolution Display With Rear Sensor Light Distortion Control
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Solution Overview
Problem
Display devices with integrated sensors face an increase in bezel area due to sensor arrangement, compromising the detecting performance and image quality.
Innovation Solution
A display device design with a substrate having a first active area of high resolution and a second active area of lower resolution, featuring a light detecting sensor on the rear surface, etched insulating layers, and light blocking patterns on the encapsulation layer to enhance transmittance and prevent light distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor is arranged on the display device to provide additional functions, then the functionality is improved, but the bezel area increases
Solution Approach 1:
The sensor is merged with the display panel structure by positioning it on the rear surface of the substrate, allowing the sensor and display functions to coexist in the same spatial footprint without increasing the overall device area
Solution Approach 2:
The sensor is positioned on the rear surface of the substrate, utilizing the z-dimension (depth) rather than expanding in the x-y plane, thereby adding functionality without increasing the visible bezel area
2Area of stationary object
If a sensor is disposed on the rear surface of the substrate to reduce bezel area, then the area is reduced, but light distortion occurs affecting detecting performance
Solution Approach 1:
The insulating layer is selectively removed only in the region corresponding to the sensor position on the rear surface, creating a local transparent window that allows light to reach the sensor without distorting the overall display structure
Solution Approach 2:
The encapsulation layer with light blocking patterns acts as an intermediary structure that seals the display elements while controlling light paths to prevent distortion from reaching the sensor
3Measurement precision
If the insulating layer is etched to increase transmittance for sensor detection, then the detecting performance is improved, but light blocking for image quality is compromised
Solution Approach 1:
The insulating layer is selectively etched only in the specific region corresponding to the sensor position, creating a localized transparent area that allows light transmission for sensing while preserving the light-blocking properties in the rest of the display area
Solution Approach 2:
The insulating layer is segmented into different regions: a removed portion at the sensor location for light transmission, and retained portions elsewhere for light blocking, allowing simultaneous optimization of both sensing and display functions
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
Improves the detecting performance of sensors on the rear surface while maintaining image quality by increasing transmittance and minimizing light distortion, thus reducing the non-active area.
Implementation Method 1
a light detecting sensor positioned on a rear surface of the substrate and overlapping the second active area
Implementation Method 2
A plurality of light blocking patterns can be positioned on the encapsulation layer. The plurality of light blocking patterns can be disposed on a part area of an area overlapping each of the plurality of holes included in the at least one insulating layer on the second active area
Data Source
AI summary
Embodiments of the present disclosure are related to a display device, as an active area overlapping a light detecting sensor positioned on a rear surface of a display panel has a low resolution and includes a plurality of holes that an insulating layer is etched, thus the display device that the light detecting sensor detects an object positioned in front of the display panel can be provided. Furthermore, as a light blocking pattern is disposed on an area overlapping an inclined surface inside of the hole, thus a distortion of a light entered to the inclined surface inside of the hole can be prevented and a detecting performance of the light detecting sensor positioned on the rear surface of the display panel can be improved.