Quantum Dot Infrared Conversion for Touch Sensing
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Solution Overview
Problem
Current liquid crystal display devices face challenges in integrating touch input functionality with infrared sensing, particularly in efficiently converting and sensing infrared light for accurate touch detection without additional IR light sources, which affects the display's efficiency and manufacturing costs.
Innovation Solution
The display device incorporates a first and second substrate with color filters containing quantum dot materials that convert single-color light from a backlight unit into infrared light, and an infrared sensor to sense this light, allowing for touch input detection without an external IR source, thereby simplifying the structure and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional IR light sources are used for infrared sensing, then sensing accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the infrared light source function with the existing backlight unit, eliminating the need for separate IR light sources. The quantum dot layer is integrated into the display structure, converting backlight into infrared light that serves both display and touch sensing functions simultaneously.
Solution Approach 2:
The backlight unit is designed to serve dual purposes: providing visible light for display and generating infrared light for touch sensing. The quantum dot material enables the backlight to emit infrared wavelengths, making the same component useful for both imaging and sensing applications.
2Measurement precision
If additional IR light sources are used for infrared sensing, then sensing accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the infrared light source function with the existing backlight unit, eliminating the need for separate IR light sources. The quantum dot layer is integrated into the display structure, converting backlight into infrared light that serves both display and touch sensing functions simultaneously.
Solution Approach 2:
The backlight unit is designed to serve dual purposes: providing visible light for display and generating infrared light for touch sensing. The quantum dot material enables the backlight to emit infrared wavelengths, making the same component useful for both imaging and sensing applications.
3Measurement precision
If quantum dot materials are used to convert light into infrared light, then infrared sensing capability is improved, but device complexity increases
Solution Approach 1:
The quantum dot layer is nested within the existing display structure, positioned between the backlight unit and the liquid crystal layer. This nested integration allows the infrared conversion function to be embedded within the display stack without requiring separate external components.
Solution Approach 2:
The patent uses quantum dot materials with specific properties that enable light-to-infrared conversion. These composite materials are integrated into the display structure, combining optical conversion capabilities with the display's existing light transmission pathway.
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 enables efficient infrared light sensing and touch detection with enhanced accuracy and reduced manufacturing complexity by utilizing quantum dot materials to convert and emit infrared light within the display device, facilitating noise separation and improved sensing accuracy.
Implementation Method 1
quantum dot materials that convert single-color light from a backlight unit into infrared light
Implementation Method 2
an infrared sensor to sense this light, allowing for touch input detection
Data Source
AI summary
Provided herein may be a display device. The display device may include a first substrate including a first substrate having a plurality of pixel areas; a second substrate having a second base substrate facing the first substrate, first to third color filters provided on the second base substrate, the first to third color filters being respectively disposed on locations corresponding to respective pixel areas of the plurality of pixel areas and embodying different colors, and an infrared sensor disposed between the plurality of pixel areas in a plan view and configured to sense infrared light; a liquid crystal layer disposed between the first substrate and the second substrate; and a backlight unit configured to provide single-color light to the liquid crystal layer. At least one of the first to third color filters may include infrared quantum dot material which converts light provided from the backlight unit into infrared light.