Proximity Sensor Light Shielding for Touch Display Interference
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Solution Overview
Problem
Existing proximity sensors in electronic devices face challenges in accurately controlling display states due to limitations in detection capability, which affects the screen ratio and interference with touch displays.
Innovation Solution
A proximity sensor design featuring an infrared emitter and receiver on a circuit board, with a light shielding element covering the rear light transmitting portion, allowing for improved detection capability by concentrating infrared light and reducing interference with touch displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the proximity sensor uses a conventional structure without light shielding, then the device complexity is low, but the detection precision is insufficient and interference with touch displays occurs
Solution Approach 1:
The light transmitting element is divided into a front light transmitting portion and a rear light transmitting portion, with the light shielding element selectively covering the rear portion. This segmentation allows the sensor to distinguish between light from the front (touch display area) and light from the rear, improving detection precision while maintaining manageable structural complexity
Solution Approach 2:
The light shielding element extracts and blocks the rear light transmitting portion from receiving ambient light, isolating the optical path to only the front light transmitting portion. This extraction of harmful light paths improves detection precision by eliminating interference from ambient light sources
2Measurement precision
If the proximity sensor is positioned to improve detection, then detection capability improves, but interference with touch display increases
Solution Approach 1:
The light shielding element converts the potentially harmful ambient light reaching the rear light transmitting portion into a beneficial blocking mechanism. By strategically positioning the light shielding element, the design transforms what would be interference into a controlled optical path that enhances detection capability while minimizing touch display interference
3Ease of manufacture
If the light transmitting element covers the entire light emitting source, then manufacturing is simple, but detection precision is reduced due to light leakage
Solution Approach 1:
The light transmitting element is segmented into front and rear light transmitting portions, with the light shielding element covering only the rear portion. This segmentation maintains manufacturing simplicity by using standard assembly processes while significantly improving detection precision by preventing light leakage from the rear side
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
Enhances the detection capability of the proximity sensor, allowing for accurate control of display states and increased screen ratio by ensuring the infrared light is effectively emitted and received outside the touch display cover plate.
Implementation Method 1
The infrared emitter includes a light emitting source arranged on the circuit board and a light transmitting element covering the light emitting source
Implementation Method 2
The infrared receiver is arranged on a side of the light emitting source
Data Source
AI summary
A proximity sensor and an electronic device. The proximity sensor includes a circuit board; an infrared emitter and an infrared receiver both arranged on the circuit board, wherein the infrared emitter includes a light emitting source arranged on the circuit board and a light transmitting element covering the light emitting source; the light emitting source has an emission optical axis, the light transmitting element includes a front light transmitting portion and a rear light transmitting portion connected to the front light transmitting portion; the front light transmitting portion is located on a front side of the emission light axis of the light emitting source, and the rear light transmitting portion is located on a rear side of the emission light axis of the light emitting source; and the infrared receiver is located on one side of the light emitting source; and a light shielding element, wherein the light shielding element covers at least a part of the rear light transmitting portion.