In-Cell Display Light Shield Patterns for Noise Reduction
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Solution Overview
Problem
Current display apparatuses face challenges in enhancing the signal-to-noise ratio for touch and fingerprint sensing, particularly in optical methods where noise light interferes with signal light, leading to reduced accuracy and effectiveness in sensing patterns.
Innovation Solution
The implementation of an in-cell type display apparatus with a thin-film transistor array, electro-luminescence devices, and light-receiving devices, where light shield patterns with opening patterns and grooves are strategically positioned to minimize noise light incidence and maximize signal light reception, enhancing the signal-to-noise ratio and fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-receiving devices are used for optical touch sensing, then touch sensing capability is provided, but noise light from outside the panel interferes with signal light, reducing signal-to-noise ratio
Solution Approach 1:
The light-receiving device is divided into multiple independent photoelectric conversion units arranged in a matrix, allowing selective reception of light from different directions and positions. This segmentation enables the system to distinguish between signal light from the display panel and noise light from external sources, improving the signal-to-noise ratio while maintaining touch sensing capability.
Solution Approach 2:
A light guide layer is introduced as an intermediary component between the display panel and the light-receiving devices. This light guide layer redirects external noise light away from the photoelectric conversion units while allowing signal light from the display panel to reach the sensors, effectively filtering noise without compromising touch sensing functionality.
2Volume of moving object
If in-cell type sensor structure is adopted, then thickness is minimized, but noise light shielding becomes more difficult
Solution Approach 1:
The patent introduces a light guide layer positioned above the light-receiving devices in the vertical dimension, creating a new spatial layer for noise light management. This additional dimension allows the thin in-cell structure to effectively block external noise light while maintaining minimal overall thickness and preserving touch sensitivity.
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 significantly improves the signal-to-noise ratio, enabling more accurate fingerprint and touch sensing by selectively shielding noise light and optimizing the geometric structure for better light reception, resulting in enhanced resolution and pattern recognition.
Implementation Method 1
a light-receiving device corresponding to each light-receiving pixel area... Each light-receiving device may include a plurality of photoelectric conversion units
Implementation Method 2
a difference in reflectance of light corresponding to a difference in a refractive index of each location of a medium that contacts a surface of a panel is sensed
Data Source
AI summary
A display apparatus comprises a thin-film transistor array disposed on a substrate; a plurality of electro-luminescence devices disposed on the thin-film transistor array; a plurality of light-receiving devices disposed on the thin-film transistor array and spaced apart from the plurality of electro-luminescence devices; a plurality of light shield patterns shielding the plurality of light-receiving devices; and at least one opening pattern arranged in each light shield pattern that has a predetermined opening direction.