Optical Sensor Module Light Guide Plate Signal Intensity
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Solution Overview
Problem
The integration of optical sensors with other functions in apparatuses, such as display panels, affects the accuracy of optical feature recognition due to interference from other structures, particularly those related to light emission, which hinders the reception of optical signals.
Innovation Solution
A module integrating an optical sensor with a light guide plate that includes a first part blocked by the sensor and a second part protruding from the sensor, designed to receive and totally reflect optical signals, enhancing signal intensity and recognition precision by altering the signal path to primarily reach the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical sensor is integrated into a display panel to implement biometric feature recognition, proximity light detection, or ambient light detection, then the functional integration is improved, but the optical feature recognition accuracy deteriorates due to interference from light emission structures inside the display panel
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the light emission structure and the optical sensor. The light guide plate receives light from the display panel's light emission structure, guides it through total internal reflection, and directs it toward the optical sensor, thereby mediating the interaction between these two components and enabling effective signal transmission despite their spatial integration
Solution Approach 2:
The light guide plate extends in the thickness direction of the display panel, creating a three-dimensional light guiding path. By utilizing the thickness dimension, the light guide plate establishes a dedicated optical channel that bypasses the two-dimensional plane where light emission structures are located, thereby avoiding interference while maintaining functional integration
2Measurement precision
If a light guide plate is disposed below an optical sensor to guide optical signals, then the optical signal reception is improved, but the device structure complexity increases
Solution Approach 1:
The light guide plate serves multiple functions simultaneously: it acts as a structural support element, a light guiding component through total internal reflection, and an optical signal directing element. By consolidating these functions into a single component, the design avoids the need for separate light guides, reflectors, and support structures, thereby reducing overall structural complexity while improving optical signal reception
Solution Approach 2:
The light guide plate utilizes changes in the refractive index parameter of materials to achieve total internal reflection. By selecting materials with appropriate refractive index characteristics, the light guide plate can efficiently guide optical signals without requiring complex mechanical structures, mirrors, or additional optical elements, thereby simplifying the overall device structure while enhancing optical signal reception
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 increases the intensity and accuracy of optical feature recognition by optimizing the light guide plate's design to enhance the reception of optical signals, improving biometric and ambient light detection capabilities.
Implementation Method 1
The second part that protrudes from the optical sensor may receive an optical signal around the optical sensor, and enable the optical signal to be totally reflected inside the light guide plate
Data Source
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AI summary
Embodiments of this application provide a module integrated with an optical sensor, a display panel, and a display apparatus. Alight guide plate and the optical sensor are arranged in a thickness direction, the optical sensor receives an optical signal from a first side, and the light guide plate is disposed on a side that is of the optical sensor and that is away from the first side. A first part of the light guide plate at least partially overlaps the optical sensor in the thickness direction, and a second part does not overlap the optical sensor. A surface that is of the first part and that is away from the optical sensor is a first protrusion structure, and an included angle between at least a partial side edge of the second part and the thickness direction is greater than 0°. In the embodiments of this application, the second part that protrudes from the optical sensor may receive an optical signal around the optical sensor, and enable the optical signal to be totally reflected inside the light guide plate. The first part that is blocked by the optical sensor may enable the optical signal inside the light guide plate to be emitted by the light guide plate after a total reflection path of the optical signal inside the light guide plate is changed, so that intensity of the optical signal received by the optical sensor can be increased, and optical feature recognition precision of the module can be increased.