Photoluminescent Pattern Layer for Digital Writing Position Detection
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Solution Overview
Problem
Existing digital writing technologies on smartphones and tablets consume excessive battery power, leading to reduced device autonomy and potential overheating, due to the reliance on device energy for hand script digitalization and position detection.
Innovation Solution
A digital writing device with a substrate having a transparent or translucent layer and a pattern layer comprising photoluminescent and non-photoluminescent areas, where the photoluminescent material emits near-infrared or visible radiation upon UV exposure, allowing for position detection independent of device energy supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hand script digitalization is activated on the device screen, then position detection capability is improved, but battery consumption increases and device autonomy deteriorates
Solution Approach 1:
The patent extracts the energy-consuming position detection function from the device's active systems and relocates it to a passive optical pattern layer. The pattern layer contains photoluminescent materials that passively emit light when illuminated by the stylus, eliminating the need for continuous battery-powered sensors or active screens to detect position.
Solution Approach 2:
The pattern layer serves itself by containing all necessary position encoding information in its physical structure. When the stylus illuminates the pattern layer, the photoluminescent materials automatically emit light at specific wavelengths that encode position data, requiring no external power supply or active processing.
2Reliability
If robust batteries are used to support hand script digitalization, then position detection reliability is improved, but device cost increases
Solution Approach 1:
The patent removes the dependency on robust batteries by extracting the power requirement from the position detection system. The optical pattern layer provides reliable position detection through passive photoluminescence, eliminating the need for expensive high-capacity batteries or reinforced hardware design.
3Measurement precision
If active screen areas are increased for better position detection, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent replaces the electronic/optical active screen system with a passive mechanical/optical pattern layer. Instead of using energy-consuming active pixels or sensors on the screen, the system uses a statically encoded optical pattern with photoluminescent materials that reflect and emit light passively, providing precise position detection without screen energy consumption.
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 solution reduces battery consumption and eliminates overheating risks by enabling position detection using UV radiation, enhancing device autonomy and reducing energy dependence on the device's power supply.
Implementation Method 1
said photoluminescent material being transparent under visible light and capable emitting in near infra-red (NIR) or visible radiation upon ultraviolet (UV) light radiation
Data Source
AI summary
The invention concerns device for a digital writing instrument the device comprising a substrate with a transparent or translucent layer and a pattern layer on the transparent layer. The pattern comprising an active area made with photoluminescent material and an inactive area made with non photoluminescent material. The photoluminescent material comprises a successive alternate of a first layer and a second layer generating photoluminescent structure at the interface of said first layer and said second layer, the pattern layer comprises a series of N points distributed in a plan (X,Y), either said N-points define the active area whereas the inactive area is defined by the area between said N points. The N-points defines the inactive area whereas the active area is defined by the area between said N points. The invention also relates to a method for determining a position, a method for manufacturing, a system and a stylus.