Device for detecting electromagnetic radiation consisting of organic materials

• US 10,461,129 B2
• Filed: 08/18/2015
• Issued: 10/29/2019
• Est. Priority Date: 08/19/2014
• Status: Active Grant

• Current Assignee: ISORG SA
• Original Assignee: ISORG SA
• Inventors: Berthod, Emeline, Dhez, Olivier, Gomez, Jean-Yves
• Primary Examiner(s): Le, Que Tan
• Application Number:
  US15/502,428
• Publication Number:
  US 20170345872A1
• Time in Patent Office: 1,533 Days
• Field of Search: 25022711, 2502141
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: H10K 30/451 comprising a metal-semiconductor-metal [m-s-m] structure
• CPC Class Codes: H10K 39/30 Devices controlled by radiation
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A device for detecting electromagnetic radiation includes at least one row of photoresistors. Each of the photoresistors includes an active portion containing organic semiconductor materials.

Claims

1. An electromagnetic radiation detection device comprising:

at least one row of photoresistors, each photoresistor comprising an active portion comprising organic semiconductor materials;

emitters of the electromagnetic radiation; and

a waveguide;

wherein the waveguide comprises at least one surface intended to be in contact with at least one object, the photoresistors being distributed along an edge of said surface, the emitters being located along said edge.

2. The detection device of claim 1, comprising an array of photoresistors distributed in rows and in columns.

3. The detection device of claim 1, wherein each active portion is connected to a first conductive electrode and to a second conductive electrode.

4. The detection device of claim 3, wherein the work function of the first conductive electrodes is equal to the work function of the second conductive electrodes to within 5%.

5. The detection device of claim 1, comprising a monolithic layer containing the active portions and extending between first conductive tracks corresponding to the first electrodes and second conductive tracks corresponding to the second electrodes.

6. The detection device of claim 1, further comprising display pixels.

7. A detection system comprising the detection device of claim 1, a circuit for selecting one of the photoresistors and a circuit for measuring the current flowing through the selected photoresistor or a voltage representative of the voltage across the selected photoresistor.

8. A method of controlling the electromagnetic radiation detection device of claim 1, comprising selecting a photoresistor from said at least one row and determining a signal representative of the resistance of the photoresistor.

9. The control method of claim 8, wherein the detection device comprises an array of photoresistors distributed in rows and in columns, first conductive tracks and second conductive tracks, each first conductive track being connected to the photoresistors of a same row and each second conductive track being connected to the photoresistors of a same column, and wherein the selection step comprises the steps of:

connecting the first conducting track connected to the photoresistor to be selected to a source of a first potential;

connecting the other first conductive tracks to a source of a second potential different from the first potential;

connecting the second conductive track connected to the photoresistor to be selected to the source of the second potential; and

connecting the other second conductive tracks to the source of the first potential.