# US 9,436,342 B2 · Screen with magnetic object locating

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- Number: US 9,436,342 B2
- Document ID: US9436342B2
- Status: Granted
- Kind: B2
- Application number: 14/389,097
- Filed: 2013-03-28
- Published: 2015-03-26
- Granted: 2016-09-06
- Earliest claimed: 2012-03-29
- Assignees: Commissariat A L'energie Atomique Et Aux Energies Alternatives
- Applicants: Commissariat à l'énergie atomique et aux énergies alternatives
- Inventors: Tristan Hautson; Timothée Jobert; Jean-Luc Vallejo
- Web page: https://patentgrep.com/patent/US9436342B2

## CPC

- G06F 3/046: by electromagnetic means
- G01B 7/004: for measuring coordinates of points
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

A screen comprising a transparent panel and a photon-generating layer in order to form each luminous pixel visible through the transparent panel, this layer being housed behind the transparent panel. There is a human/machine interface able to control the photon-generating layer in order to modify the display of an image by the screen. The interface includes a localizing device for localizing a movable permanent magnet able to be moved directly by hand by a human being in front of the panel, this device comprising for this purpose. The interface also includes a network of magnetometers comprising N tri-axis magnetometers mechanically connected to one another with no degree of freedom in order to maintain a known distance between each of these magnetometers, where N is a whole number higher than or equal to five. There is an electronic processing unit able to determine the position and/or orientation of the permanent magnet from the measurements of the magnetometers of this network and a unit able to control the photon-generating layer in order to modify the display depending on the position and/or orientation determined by the device for localizing.

## Claims

### Claim 1

A screen comprising:
a transparent panel;
a photon-generating layer in order to form each luminous pixel visible through the transparent panel, the photon-generating layer being housed behind the transparent panel; and
a human/machine interface able to control the photon-generating layer in order to modify the display of an image by the screen, wherein the interface comprises:
a localizing device for localizing a movable permanent magnet able to be moved directly by hand by a human being in front of the panel, the localizing device comprising for this purpose:
a network of magnetometers comprising N tri-axis magnetometers mechanically connected to one another with no degree of freedom in order to maintain a known distance between each of these magnetometers, where N is a whole number higher than or equal to five; and
an electronic processing unit able to determine the position and/or orientation of the permanent magnet from the measurements of the magnetometers of this network; and
a unit able to control the photon-generating layer in order to modify the display depending on the position and/or orientation determined by the device for localizing; and
wherein the magnetometers of the network of magnetometers are arranged inside a strip that encircles the external periphery of the photon generating layer and none of the magnetometers of the network of magnetometers is placed in front of or behind the photon-generating layer in a direction perpendicular to the layer.

### Claim 2 (depends on 1)

The screen as claimed in claim 1, in which the number N is higher than or equal to sixteen.

### Claim 3 (depends on 1)

The screen as claimed in claim 1, in which the magnetometers are placed in a given plane and distributed in this plane so as to form a plurality of columns of magnetometers that are parallel to one another.

### Claim 4 (depends on 1)

An assembly, comprising:
a screen according to claim 1; and
a movable permanent magnet able to be localized by the localizing device.

### Claim 5

A method for controlling the display of a screen equipped with a transparent panel and with a photon-generating layer in order to form each luminous pixel visible through the transparent panel, the photon-generating layer being housed behind the transparent panel, wherein the method comprises:
a human being moving a movable permanent magnet directly by hand in front of the panel;
measuring the magnetic field generated or modified by the permanent magnet with a plurality of magnetometers of a network of magnetometers comprising N tri-axis magnetometers mechanically connected to one another with no degree of freedom in order to maintain a known distance between each of these magnetometers, where N is a whole number higher than or equal to five;
determining, with an electronic processing unit, the position and/or the orientation of the permanent magnet from the measurements of the magnetometers of this network; and
controlling the photon-generating layer in order to modify the display depending on the position and/or orientation determined by the electronic unit and
Wherein the step of determining includes:
a) estimating the position of the permanent magnet relative to the network of magnetometers;
b) calculating the distance between each magnetometer and the estimated position of the permanent magnet; then
c) eliminating the N, magnetometers closest to or the Ne magnetometers furthest from this estimated position, where Ni+Ne is a positive whole number strictly lower than N;
d) measuring the magnetic field generated or modified by the permanent magnet with each non-eliminated magnetometer; and
e) determining the position and/or orientation of the permanent magnet from the measurements alone of the magnetometers that have not been eliminated.

### Claim 6 (depends on 5)

The method as claimed in claim 5, in which in the measuring step, the eliminated magnetometers are turned off.

### Claim 7 (depends on 5)

A non-transitory data storage medium, containing program instructions for implementing a control method according to claim 5 when said instructions are executed by an electronic processor.

### Claim 8

A screen comprising:
a transparent panel;
a photon-generating layer in order to form each luminous pixel visible through the transparent panel, the photon-generating layer being housed behind the transparent panel; and
a human/machine interface able to control the photon-generating layer in order to modify the display of an image by the screen, wherein the interface comprises:
a localizing device for localizing a movable permanent magnet able to be moved directly by hand by a human being in front of the panel, the localizing device comprising for this purpose:
a network of magnetometers comprising N tri-axis magnetometers mechanically connected to one another with no degree of freedom in order to maintain a known distance between each of these magnetometers, where N is a whole number higher than or equal to five; and
an electronic processing unit able to determine the position and/or orientation of the permanent magnet from the measurements of the magnetometers of this network; and
a unit able to control the photon-generating layer in order to modify the display depending on the position and/or orientation determined by the device for localizing; and
wherein the electronic unit includes a non-transitory computer-readable medium containing program instructions programmed to:
a) estimate the position of the permanent magnet relative to the network of magnetometers;
b) calculate the distance between each magnetometer and the estimated position of the permanent magnet; then
c) eliminate the Ni magnetometers closest to or the Ne magnetometers furthest from this estimated position, where Ni+Ne is a positive whole number strictly lower than N;
d) acquire the measurement of the magnetic field generated or modified by the permanent magnet taken by each non-eliminated magnetometer; and
e) determine the position or orientation of the permanent magnet from the measurements alone of the non-eliminated magnetometers.