Conformable matrix display device

Patent metadata

Field	Value
Publication number	US-10636351-B2
Application number	US-201716303327-A
Country	US
Kind code	B2
Filing date	May 26, 2017
Priority date	May 26, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A conformable matrix display device is provided with row conductors on the conformable carrier, each for a respective row of the matrix of pixel circuits. Each row conductor has serpentine trajectories in spaces between the pixel circuits in the respective row. Power supply voltage and selection pulse signals are transmitted over the same row conductors. Each row conductor is connected to supply voltage and selection inputs of the pixel circuits in the respective row. Each pixel circuit has a pulse transmission circuit coupled between the selection input and the control input of a de-multiplexing circuit for de-multiplexing data signals on column conductors. In this way the power supply voltage and the selection signal can be supplied making shared use of space between the pixel circuits. Thus the number of conductors in the matrix display device is reduced, which enables a greater distance between the conductors and/or bends in the conductors, which makes the circuit more stretchable and/or bendable.

First claim

The invention claimed is:

1. A conformable matrix display device, comprising
a conformable carrier;
a matrix of pixel circuits on the conformable carrier, each pixel circuit comprising
a first and second supply voltage input;
a light intensity control circuit coupled between the first and second supply voltage input;
a data signal input;
a data signal storage element coupled to a control input of the light intensity control circuit;
a de-multiplexing circuit coupled between the data signal input and the data signal storage element, the de-multiplexing circuit having a control input for controlling transfer of a data signal from the data signal input to the data signal storage element;

row conductors on the conformable carrier, each for a respective row of the matrix of pixel circuits, each row conductor having serpentine trajectories in spaces between the pixel circuits in the respective row, each of said row conductors connected to the first supply voltage inputs of the pixel circuits in the respective row; wherein
each pixel circuit has a pulse transmission circuit coupled between the row conductor of the row in which the pixel circuit is located and the control input of the de-multiplexing circuit.

2. A conformable matrix display device according to claim 1 , further comprising a row selection circuit coupled to the row conductors and configured to supply a supply voltage on the row conductors, with superimposed pulses successively on different selected ones of the row conductors.

3. A conformable matrix display device according to claim 1 , wherein the de-multiplexing circuit comprises a switching transistor, with a main current channel coupled between the data signal input and the data signal storage element, the switching transistor having a control electrode coupled to the row conductor via the pulse transmission circuit.

4. A conformable matrix display device according to claim 1 , wherein the pulse transmission circuit is voltage level shifting circuit, configured to pass the voltage from the row conductor with the pulse superimposed on a supply voltage to the control input of the de-multiplexing circuit with a voltage level shift.

5. A conformable matrix display device according to claim 1 , wherein the light intensity control circuit comprises a LED diode and a control transistor with a main current channel coupled in series with the LED diode between the first and second supply voltage, the control transistor having a control electrode coupled to the data signal storage element.

6. A conformable matrix display device according to claim 1 , comprising further row conductors on the conformable carrier, each for a respective row of the matrix of pixel circuits, each further row conductor having serpentine trajectories in spaces between the pixel circuits in the respective row, each of said row conductors connected to the second supply voltage inputs of the pixel circuits in the respective row.

7. A conformable matrix display device according to claim 1 , comprising column conductors on the conformable carrier each for a respective column of the matrix of pixel circuits, each column conductor having serpentine trajectories in spaces between the pixel circuits in the respective column, each column conductor connected to the data inputs of the pixel circuits in the respective column.

8. A conformable matrix display device according to claim 1 , comprising plurality of column conductors on the conformable carrier for each column of the matrix, wherein each pixel circuit comprises a plurality of light intensity control circuits coupled between the first and second supply voltage input, a plurality of data signal storage elements, and a plurality of de-multiplexing circuits coupled between respective ones of the column conductors for the column wherein the pixel circuit is located, wherein the pulse transmission circuit is coupled to control inputs each of the plurality of de-multiplexing circuits.

Assignees

• TNO
• Imec Vzw

Inventors

• Cobb Brian Hardy
• Genoe Jan

Classifications

• G09G2300/0871

  with level shifting · CPC title

• G09G3/2085 Primary

  Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2380/02

  Flexible displays · CPC title