Under-Panel Sensor Display Layout for Low-Bezel Light Detection
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Solution Overview
Problem
The increase in bezel area due to the arrangement of sensors in display devices compromises the detecting performance of sensors and the aesthetic appeal of the display.
Innovation Solution
A display device design where a sensor is positioned on the rear surface of the display panel, overlapping an area with lower resolution, and incorporating light blocking patterns and insulating layers with holes to enhance transmittance and minimize light distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is arranged on the front surface of the display device, then the detecting performance of the sensor is improved, but the bezel area increases
Solution Approach 1:
The sensor is moved from the front surface (2D plane) to the rear surface of the display panel, utilizing the third dimension (depth) to resolve the contradiction. This allows the sensor to detect objects without occupying front surface area, thus maintaining detecting performance while reducing bezel area.
Solution Approach 2:
Instead of placing the sensor on the conventional front surface, the invention inverts the arrangement by positioning the sensor on the rear surface of the display panel. This inverted configuration allows light to pass through the display panel to reach the sensor, achieving both compact bezel design and effective object detection.
2Area of stationary object
If a sensor is disposed on the rear surface of the display panel, then the bezel area is reduced, but the detecting performance of the sensor deteriorates due to light distortion
Solution Approach 1:
A light blocking pattern is introduced as an intermediary element between the display panel and the sensor. This pattern selectively blocks distorted light paths while allowing useful light to reach the sensor, thereby compensating for the light distortion issue caused by rear-surface sensor placement.
Solution Approach 2:
The light blocking pattern is applied locally at specific positions where light distortion occurs, rather than uniformly across the entire display panel. This localized approach maintains image quality in most areas while correcting light distortion only where necessary for sensor detection accuracy.
3Measurement precision
If the transmittance of the active area is increased to improve sensor detection, then the image quality deteriorates due to light leakage
Solution Approach 1:
The light blocking pattern converts the potentially harmful effect of light leakage into a beneficial solution. By strategically placing light blocking patterns, the invention blocks harmful light paths that would cause image quality degradation while preserving useful light paths needed for sensor detection, thus turning a potential problem into a solution.
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 while maintaining image quality and reducing the non-active area, thereby enhancing the overall display device's functionality and aesthetics.
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.