Floating Touch Display Using Quantum Dot Infrared Sensing
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Solution Overview
Problem
Existing floating touch display technologies using capacitive sensitive touch or external infrared sensors face limitations in touch accuracy and bulkiness, with capacitive methods requiring short finger-screen distances and infrared methods having insufficient sensors affecting display quality.
Innovation Solution
A floating touch display apparatus incorporating a display panel with light-emitting and light-receiving units using quantum dots to emit and receive light in specific wavebands, allowing for accurate touch identification without physical contact, including the use of invisible infrared light to enhance touch sensitivity and prevent display interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external infrared sensors are used to implement floating touch, then the touch display apparatus can detect floating touch actions, but the apparatus becomes bulky and the touch accuracy is limited due to insufficient sensor quantity
Solution Approach 1:
The patent merges the light-emitting function and light-receiving function into a single display panel structure. The display panel includes both display units that emit visible light and sensing units that emit and receive infrared light, eliminating the need for separate external infrared sensors. This integration reduces device bulkiness while enabling accurate floating touch detection through the infrared sensing capability built into the panel.
Solution Approach 2:
The display panel is designed to serve multiple functions simultaneously: it acts as both the display interface for visible information and the touch sensing interface for floating touch detection. The sensing units within the panel emit infrared light and detect reflected infrared light from fingers, enabling the panel to function as both display and touch sensor, thereby improving touch accuracy without adding external components.
2Adaptability or versatility
If capacitive sensitive touch is used to implement floating touch by increasing sensing capacitor sensitivity, then floating touch can be realized, but the distance between finger and screen must be short, limiting floating touch capability
Solution Approach 1:
The patent replaces the capacitive sensing mechanism with an optical sensing mechanism. Instead of detecting changes in capacitance when a finger approaches, the system uses infrared light emission and detection. The sensing units emit infrared light that reflects off the finger and returns to the sensors, enabling floating touch detection at greater distances without being constrained by the short-range limitations of capacitive sensing.
3Measurement precision
If external infrared sensors are used for floating touch detection, then floating touch can be detected, but the number of sensors must be limited to avoid affecting normal display, thus limiting touch accuracy
Solution Approach 1:
The display panel is segmented into multiple independent units, each capable of both display and sensing functions. The panel includes a matrix of display units and sensing units distributed across the panel area. This segmentation allows for a sufficient number of sensing points to achieve high touch accuracy while integrating the sensing function into the existing display structure, avoiding the need for separate external sensor arrays.
Solution Approach 2:
The patent combines the display pixel structure with the infrared sensing structure. Each sensing unit is integrated within the display panel framework, sharing the same substrate and control circuitry. This merging allows the system to achieve high touch accuracy through multiple distributed sensing points without adding external sensor components that would increase device complexity.
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 provides high touch accuracy and strong floating touch capability while maintaining a slim and lightweight design, enabling precise finger position and action detection even at larger distances from the screen.
Implementation Method 1
a first quantum dot, which emits the light in the (n+1)-th waveband upon being irradiated with light
Implementation Method 2
a first quantum dot, which emits the light in the (n+1)-th waveband upon being irradiated with light or applied with a voltage
Implementation Method 3
a second quantum dot, which absorbs the light in the (n+1)-th waveband and converts the light to an electrical signal
Implementation Method 4
the infrared light is reflected by the finger in the case that there is a certain distance between the finger and the screen and is received by the infrared sensor
Data Source
AI summary
A floating touch display apparatus is provided. The apparatus comprises a display panel and a touch identifying unit. The display panel comprises: a plurality of pixels, each pixel of the display panel including n sub-pixels, and the n sub-pixels respectively emitting light having wavelengths in a first to an n-th wavebands to display and image; a plurality of light-emitting units, each light-emitting unit being configured for emitting light having a wavelength in a (n+1)-th waveband, and wavelength ranges of the light in the first to the (n+1)-th wavebands being not coincide; a plurality of light-receiving units, each light-receiving unit being configured for receiving the light in the (n+1)-th waveband and generating a touch identifying signal. The touch identifying unit identifies a floating touch action according to the touch identifying signal generated by the light-receiving unit.