In-cell Light Shield Pattern for Display Noise Reduction
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Solution Overview
Problem
Display apparatuses with in-cell type light-receiving devices face challenges in enhancing the signal-to-noise ratio for touch and fingerprint sensing, as they struggle to minimize external and internal noise light, leading to reduced accuracy in pattern recognition and increased complexity due to the integration of additional sensor modules.
Innovation Solution
The implementation of a display apparatus with a thin-film transistor array, electro-luminescence devices, and light-receiving devices, where light shield patterns with a wider width than the light-receiving devices are disposed above a transparent film to cover and overlap with the light-receiving devices, minimizing noise light input and allowing for a simpler structure by integrating light-receiving devices within the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light-receiving devices are integrated within the display panel (in-cell type), then device complexity is reduced and structure is simplified, but signal-to-noise ratio deteriorates due to increased noise light from external and internal sources
Solution Approach 1:
A light shield pattern is introduced as an intermediary element between the light-receiving device and the noise light sources. This pattern selectively blocks external and internal noise light while allowing signal light to reach the light-receiving device, thereby improving the signal-to-noise ratio without compromising the simplified in-cell structure
Solution Approach 2:
The light shield pattern is strategically positioned and dimensioned to provide selective shielding. By making the light shield pattern wider than the light-receiving device and positioning it at specific coordinates, it creates localized protection against noise light while maintaining transparency to signal light, thus improving measurement precision in the critical sensing area
2Measurement precision
If additional sensor modules are added to improve sensing accuracy, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-receiving devices are merged with the display panel structure itself, forming an integrated in-cell type sensor system. This consolidation eliminates the need for separate additional sensor modules, reducing device complexity and manufacturing difficulty while maintaining sensing accuracy through the optimized light shield pattern and light-receiving device configuration
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 signal-to-noise ratio, improves the accuracy of touch and fingerprint pattern recognition, and simplifies the structure by eliminating the need for additional sensor modules, resulting in a more efficient and accurate sensing mechanism.
Implementation Method 1
a difference in reflectance of light corresponding to a difference in a refractive index of each location of a medium which contacts a surface of a panel is sensed to sense touches or patterns of fingerprints
Implementation Method 2
there is a need for a method of improving a signal-to-noise ratio by increasing a ratio of signal light to noise light
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 a thin-film transistor array including a plurality of thin-film transistors which correspond to the plurality of display pixel areas; a plurality of electro-luminescence devices disposed above the thin-film transistor array and corresponding to the plurality of display pixel areas; a plurality of light-receiving devices disposed above the thin-film transistor array and corresponding to the plurality of light-receiving pixel areas; a transparent film covering the plurality of electro-luminescence devices and the plurality of light-receiving devices; and a plurality of light shield patterns disposed on the transparent film and overlapping the plurality of light-receiving devices.