Inclined Light Guide Paths for Stray Light Reduction
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Solution Overview
Problem
Optical detection devices face challenges in reducing outside light and stray light interference, which affects the signal-to-noise ratio (S/N) in optical sensors used for applications like personal authentication and display devices.
Innovation Solution
A display device design incorporating a light guide with inclined light guide paths and a light-blocking portion to overlap light-receiving elements, reducing outside light interference and enhancing signal detection by guiding reflected light efficiently to the light-receiving elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-receiving elements are arranged on a substrate for optical detection, then optical detection function is achieved, but outside light and stray light interfere with the signal
Solution Approach 1:
A light guide is introduced as an intermediary component between the display panel and light-receiving elements. The light guide transmits only reflected light from the display panel to the light-receiving elements while blocking outside light and stray light through its specific structural design with light guide paths and light-blocking portions.
Solution Approach 2:
The light guide is divided into multiple light guide paths arranged in parallel, with each path containing a light-blocking portion. This segmentation allows the system to selectively transmit specific light paths while blocking others, thereby separating useful reflected light from harmful outside light and stray light.
2Productivity
If light guide paths are arranged to overlap light-receiving elements, then light transmission efficiency is improved, but outside light can still reach the light-receiving elements
Solution Approach 1:
The light guide structure incorporates light-blocking portions at specific locations where outside light would otherwise reach the light-receiving elements. These light-blocking portions are strategically positioned to block harmful light while preserving the light guide paths for transmitting reflected light from the display panel to the light-receiving elements.
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 improves the signal-to-noise ratio by effectively reducing stray light and outside light interference, enhancing the sensitivity and accuracy of light detection in optical sensors.
Implementation Method 1
a light guide provided so as to overlap the light-receiving elements. The light guide comprises light guide paths at least partially overlapping the light-receiving elements
Implementation Method 2
comprises a light-blocking portion having higher absorbance of the light than that of the light guide paths
Data Source
AI summary
A display device includes a display panel, a plurality of light-receiving elements that are located inside a display region of the display panel as viewed from a normal direction of the display panel, and are configured to receive light, and a light guide provided so as to overlap the light-receiving elements. The light guide comprises light guide paths at least partially overlapping the light-receiving elements, and comprises a light-blocking portion having higher absorbance of the light than that of the light guide paths, and the light guide paths are inclined in a predetermined first direction with respect to the normal direction of the display panel.