# US 11,443,686 B2 · Display screen having light-emitting diodes

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- Number: US 11,443,686 B2
- Document ID: US11443686B2
- Status: Granted
- Kind: B2
- Application number: 16/766,636
- Filed: 2018-12-06
- Published: 2020-11-19
- Granted: 2022-09-13
- Earliest claimed: 2017-12-28
- Assignees: Aledia
- Applicants: Aledia
- Inventors: Matthieu Charbonnier; Frédéric Mercier
- Web page: https://patentgrep.com/patent/US11443686B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
- G09G 2300/0809: Several active elements per pixel in active matrix panels
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2330/025: Reduction of instantaneous peaks of current
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A display screen including display circuits, each display circuit including a light-emitting diode, a controllable current source powering the light-emitting diode, and a control circuit capable of supplying a pulse-width modulated signal for controlling the current source from a periodic signal. The display screen further includes first electrodes coupled to the control circuits, a circuit for supplying a selection signal successively on each first electrode, and an oscillating circuit or oscillating circuits capable of supplying the periodic signals, the periodic signals being non-synchronous with the display circuit selection signals.

## Claims

### Claim 1

A display screen comprising at least one thousand display circuits, each display circuit comprising a light-emitting diode, a controllable current source powering the light-emitting diode, and a control circuit capable of supplying a pulse-width modulated signal for controlling the current source from a periodic signal, the display screen further comprising first electrodes coupled to the control circuits, a circuit for supplying a selection signal successively on each first electrode, and oscillating circuits capable of supplying the periodic signals, the periodic signals being non-synchronous with the display circuit selection signals and being non-synchronous between them, such that rising and/or falling edges of a first signal among the periodic signals and the display circuit selection signals occur neither at a same time as rising and/or falling edges of a second signal among the periodic signals and the display circuit selection signals nor at regular intervals with respect to the rising and/or falling edges of the second signal, and wherein each oscillating circuit is coupled to less than one hundred of said control circuits.

### Claim 2 (depends on 1)

The display screen of claim 1, wherein each of said at least two oscillating circuits is coupled to at least two of said control circuits.

### Claim 3 (depends on 1)

The display screen of claim 1, wherein each of said at least two oscillating circuits is coupled to at least ten of said control circuits.

### Claim 4 (depends on 1)

The display screen of claim 1, further comprising second electrodes coupled to the control circuits and a circuit for supplying data signals on the second electrodes and wherein the control circuit of each display circuit comprises a circuit for storing the data signal received by the control circuit and a circuit for comparing the data signal and the periodic signal capable of supplying the pulse-width modulated control signal.

### Claim 5 (depends on 1)

The display screen of claim 1, wherein the frequency of each periodic signal is greater than twice the frequency of the selection signal on one of the first electrodes.

### Claim 6 (depends on 1)

The display screen of claim 1, wherein the frequency of each periodic signal is greater than ten times the frequency of the selection signal on one of the first electrodes.

### Claim 7 (depends on 1)

The display screen of claim 1, wherein the frequency of each periodic signal is smaller than 1 MHz.