Light Shielding Film Opening Patterns for Display Touch Sensing
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Solution Overview
Problem
Display apparatuses with light-receiving pixel areas face challenges in enhancing the signal-to-noise ratio, particularly in distinguishing signal light from noise light for touch and fingerprint sensing, leading to reduced accuracy and efficiency in optical methods.
Innovation Solution
The implementation of a display apparatus with a light-sensing unit comprising light-receiving devices, a light shielding film, and opening patterns that optimize the incidence angle and effective light-receiving area to minimize noise light input and maximize signal light absorption, thereby improving the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-receiving device is used for touch sensing, then touch detection capability is improved, but noise light from outside the panel reduces signal-to-noise ratio
Solution Approach 1:
The light-receiving device is divided into multiple independent light-receiving elements arranged in an array, with each element corresponding to a specific pixel area. This segmentation allows selective reading of light received from different locations, enabling precise touch position detection while ignoring noise light from other areas.
Solution Approach 2:
Each light-receiving element has its light sensitivity optimized for its specific location and function. The light-receiving elements directly beneath display pixels are configured to detect touch-induced light changes, while elements in non-display areas can be optimized for different characteristics, allowing each local region to contribute optimally to touch sensing while minimizing noise.
2Adaptability or versatility
If light-receiving pixel areas are integrated into the display panel, then touch sensing function is improved, but display area is reduced due to non-display areas
Solution Approach 1:
The light-receiving device serves multiple functions: it acts as both a display element (when emitting light) and a touch sensing element (when detecting light changes). By integrating these functions into the same pixel structure, the display panel achieves full-area touch sensing capability without requiring separate non-display sensing areas, thus maximizing the effective display area.
Solution Approach 2:
The display function and touch sensing function are merged into a single integrated structure. The same pixel elements that display images also detect touch by measuring light changes, eliminating the need for separate touch sensing layers or non-display sensing areas. This combination allows the entire display area to function as both display and touch-sensing regions simultaneously.
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
This configuration enhances the accuracy of touch and fingerprint sensing by reducing optical noise and improving the signal-to-noise ratio, allowing for more precise pattern recognition and touch location detection.
Implementation Method 1
In an area not touched by skin, internal light is reflected at high reflectance and input to a light-receiving device corresponding to the area
Implementation Method 2
In an area contacted by skin, a large amount of the internal light is transmitted or absorbed, and only a small amount of the internal light is input to a light-receiving device
Data Source
AI summary
A display apparatus including a plurality of display pixel areas and a plurality of light-receiving pixel areas which are arranged in a display area in which an image is displayed, comprises an image-displaying unit configured to display the image and including a plurality of electro-luminescence devices which corresponds to the plurality of display pixel areas; and a light-sensing unit disposed below the image-displaying unit, wherein the light-sensing unit comprises a plurality of light-receiving devices corresponding to the plurality of light-receiving pixel areas; a light shielding film disposed on a transparent film that covers the plurality of light-receiving devices; and a plurality of opening patterns corresponding to the plurality of light-receiving devices and formed in the light shielding film.