Sensor Package with Polarized Shielding for OLED Backlight Filtering
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Solution Overview
Problem
Existing display devices with OLED panels face inaccuracies in ambient light sensors due to unwanted backlight emission, which affects the sensors' accuracy and image quality.
Innovation Solution
A sensor package is designed with a shielding cover and polarizers having different polarization directions, filtering out unnecessary light to improve contrast and image quality by isolating the sensors from unwanted backlight and ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ambient light sensors and proximity sensors are disposed under OLED display panel to receive external light, then screen brightness control and power-saving effects are achieved, but backlight emitted from OLED is also received by sensors which affects sensor accuracy
Solution Approach 1:
The optical sensor element is divided into multiple sensing regions (first sensing region, second sensing region, third sensing region) with different polarization orientations. Each region selectively detects light polarized in specific directions, allowing the sensor to distinguish between desired ambient light and unwanted backlight based on their different polarization characteristics.
Solution Approach 2:
Different regions of the optical sensor element are assigned different local properties (polarization sensitivities). The first sensing region is sensitive to light polarized in a first direction, the second sensing region to light polarized in a second direction, and the third sensing region to light polarized in a third direction. This local differentiation enables selective detection and filtering of light based on polarization orientation.
2Measurement precision
If shielding cover with guiding openings and polarizers are added to filter unwanted light, then sensor accuracy and image quality are improved, but device structure becomes more complex
Solution Approach 1:
The shielding cover and polarizing filter are integrated into a single component structure. The polarizing film is disposed on the shielding cover, combining the light-blocking function of the shielding cover with the light-polarization function of the filter in one element, thereby reducing overall structural complexity while maintaining filtering effectiveness.
Solution Approach 2:
The shielding cover serves multiple functions: it blocks unwanted light paths, provides structural support for the polarizing film, and defines the optical pathways through its guiding openings. The polarizing film simultaneously filters polarized light and enhances the shielding effect. This multi-functionality reduces the need for separate components.
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
The solution enhances the accuracy of ambient light sensors and improves image quality by effectively blocking unwanted light, thereby increasing the sensing performance and contrast of the display device.
Implementation Method 1
The first polarizer and the second polarizer are disposed correspondingly to the second guiding opening. A first polarization direction of the first polarizer is different from a second polarization direction of the second polarizer.
Data Source
AI summary
A sensor package and a display device are provided. The sensor package is disposed inside the display device. The sensor package includes a substrate, a plurality of sensor elements, a shielding cover, a first polarizer, and a second polarizer. The plurality of sensor elements and the shielding cover are disposed on the substrate. The shielding cover covers the plurality of sensor elements. When light passes through the first polarizer, the light forms a first polarized light beam. When another light passes through the second polarizer, the another light forms a second polarized light beam. A first polarization direction of the first polarizer is different from a second polarization direction of the second polarizer.