Under-Display Light Sensor Polarization for Full-Screen Proximity Sensing
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Solution Overview
Problem
In electronic devices with displays that occupy the entire front surface, integrating a proximity illumination sensor is challenging due to difficulties in sensing ambient light and positioning the sensor, especially when the display covers the front surface.
Innovation Solution
A lower display sensor is implemented, comprising a light sensor with a light irradiation and receiving portion, a sensor polarizing layer, and a delay layer, which converts induction light into circularly polarized light to pass through the display polarizing layer, allowing for effective external light sensing while avoiding interference from internal light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display occupies the entire front surface, then the display area is increased, but the position for configuring the proximity illumination sensor is lost
Solution Approach 1:
The patent moves the sensor from the traditional front surface location to the lower edge of the display, utilizing a different spatial dimension. This allows the sensor to be positioned at the bottom edge where there is still access to external light, while maintaining the full front surface display area.
Solution Approach 2:
The patent introduces a light guide structure as an intermediary component that channels external light to the sensor located at the lower edge. This mediator enables the sensor to receive sufficient light for accurate sensing while being positioned in a location that does not interfere with the display area.
2Measurement precision
If the sensor is placed on the front surface, then proximity detection is improved, but the housing blocks ambient light sensing
Solution Approach 1:
The sensor is relocated from the front surface to the lower edge of the display, a different spatial dimension that is not blocked by the housing structure. This positioning allows the sensor to detect ambient light and perform proximity detection without the housing obstructing the light path.
3Area of stationary object
If the sensor is located below the display, then the front surface is fully occupied by display, but sensing external light becomes difficult
Solution Approach 1:
A light guide structure is introduced as an intermediary that captures external light from the front surface and directs it to the sensor located at the lower edge. This mediator ensures that the sensor receives sufficient light for accurate sensing while the entire front surface remains occupied by the display.
Solution Approach 2:
The sensor is positioned at the lower edge rather than below the display, utilizing the edge dimension to maintain access to external light while preserving the full display area on the front surface.
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
Enables accurate illumination sensing and proximity detection even when the display covers the front surface, improving the device's ability to measure external light and object proximity without compromising display visibility.
Implementation Method 1
a first sensor polarizing layer, disposed on an upper portion of the light sensor and having a polarizing axis inclined at a first angle; and a first sensor delay layer, disposed on an upper portion of the sensor polarizing layer and having a slow axis inclined at a first angle with respect to the polarizing axis
Implementation Method 2
the first sensor polarizing layer and the first sensor delay layer convert the induction light into an inductive sensor circularly polarized light
Implementation Method 3
the inductive sensor circularly polarized light is converted into an inductive sensor linearly polarized light with a same polarizing axis as the polarizing axis of the display polarizing layer through the display delay layer
Implementation Method 4
a polarizing axis of the display polarizing layer is inclined at a second angle with respect to the slow axis of the display delay layer
Implementation Method 5
a light receiving portion that detects a reflected light reflected by the induction light from the object
Data Source
AI summary
The disclosure relates to a lower display sensor. The lower display sensor includes: a light sensor, including a light irradiation portion that irradiates an induction light used for sensing an object located outside a display, and a light receiving portion that detects a reflected light reflected by the induction light from the object; a first sensor polarizing layer, disposed on an upper portion of the light sensor and having a polarizing axis inclined at a first angle; and a first sensor delay layer, disposed on an upper portion of the sensor polarizing layer and having a slow axis inclined at a first angle with respect to the polarizing axis.