ORGANIC EL DISPLAY DEVICE AND METHOD FOR DETECTING TOUCH

• US 20110273397A1
• Filed: 03/03/2011
• Published: 11/10/2011
• Est. Priority Date: 05/06/2010
• Status: Abandoned Application

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Toshiba Mobile Display Company Limited (Japan Display Incorporated)
• Inventors: HANARI, Jun
• Application Number:
  US13/039,682
• Publication Number:
  US 20110273397A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: 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
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

According to one embodiment, an organic EL display device has a pixel circuit on a first substrate and a touch detection circuit adjacent to the pixel circuit on the first substrate. The pixel circuit has an organic EL light-emitting element configured to emit light having brightness depending on a pixel voltage supplied by a pixel signal line, a drive element configured to drive the organic EL light-emitting element, and a first select element configured to supply the pixel voltage to the drive element in synchronization with a control signal supplied by a control signal line. The touch detection circuit has a touch detection capacitor configured to detect a presence/absence of a touch of a dielectric and a second select element configured to output a signal indicative of the presence/absence of the touch of the dielectric detected by the touch detection capacitor to an electrostatic signal line in synchronization with the control signal supplied by the control signal line.

Claims

1. An organic EL display device comprising:

a pixel circuit on a first substrate; and

a touch detection circuit adjacent to the pixel circuit on the first substrate,

wherein the pixel circuit comprises;

an organic EL light-emitting element configured to emit light having brightness depending on a pixel voltage supplied by a pixel signal line;

a drive element configured to drive the organic EL light-emitting element; and

a first select element configured to supply the pixel voltage to the drive element in synchronization with a control signal supplied by a control signal line,

the touch detection circuit comprises;

a touch detection capacitor configured to detect a presence/absence of a touch of a dielectric; and

a second select element configured to output a signal indicative of the presence/absence of the touch of the dielectric detected by the touch detection capacitor to an electrostatic signal line in synchronization with the control signal supplied by the control signal line.

2. The device of claim 1, wherein the pixel signal line in the pixel circuit and the electrostatic signal line in the touch detection circuit are integrated.

3. The device of claim 1, wherein the touch detection circuit is adjacent to the pixel circuit in a first direction,

a length of the touch detection capacitor in a second direction orthogonal to the first direction is larger than a length of the touch detection capacitor in the first direction,

the touch detection capacitor is configured to be pre-charged in synchronization with a pre-charge signal supplied by a pre-charge signal line formed in the first direction,

a first distance is longer than a second distance, the first distance being a distance from the pre-charge signal line in the touch detection circuit to the pre-charge signal line in another touch detection circuit adjacent to the touch detection circuit in the second direction, the second distance being a distance from a first wire farthest from the touch detection circuit among wires formed in the second direction in the pixel circuit to a second wire farthest from the pixel circuit among wires formed in the second direction in the touch detection circuit.

4. An organic EL display device comprising:

a plurality of pixel circuits on a first substrate, each of the pixel circuits emitting different colored light; and

a touch detection circuit adjacent to one of the pixel circuits on the first substrate,

wherein each of the pixel circuits comprises;

an organic EL light-emitting element configured to emit light having brightness depending on a pixel voltage supplied by a pixel signal line;

a drive element configured to drive the organic EL light-emitting element; and

a first select element configured to supply the pixel voltage to the drive element,

in at least one of the pixel circuits, the pixel voltage is supplied to the drive element in synchronization with a first control signal supplied by a first control line, and

in at least another of the other pixel circuits, the pixel voltage is supplied to the drive element in synchronization with a second control signal supplied by a second control line,

the touch detection circuit comprises;

a touch detection capacitor configured to detect a presence/absence of a touch of a dielectric; and

a second select element configured to output a signal indicative of the presence/absence of the touch of the dielectric detected by the touch detection capacitor to an electrostatic signal line in synchronization with the first control signal supplied by the first control signal line.

5. The device of claim 4, wherein the touch detection circuit is adjacent to one of the pixel circuit in a first direction,

a length of the touch detection capacitor in a second direction orthogonal to the first direction is larger than a length of the touch detection capacitor in the first direction,

the touch detection capacitor is configured to be pre-charged in synchronization with a pre-charge signal supplied by a pre-charge signal line formed in a first direction,

the first and the second control signal lines and the pre-charge signal lines are formed in the first direction,

a first distance is longer than a second distance, the first distance being a distance from the pre-charge signal line in the touch detection circuit to the pre-charge signal line in another touch detection circuit adjacent to the touch detection circuit in the second direction, the second distance being a distance from a first wire farthest from the touch detection circuit among wires in the pixel circuit formed in the second direction to a second wire farthest from the pixel circuit among wires in the touch detection circuit formed in the second direction.

6. The device of claim 4, wherein the pixel signal line of at least one of the pixel circuits and the electrostatic signal line in the touch detection circuit are integrated.

7. The device of claim 6, wherein the pixel signal line of one of the pixel circuits adjacent to the touch detection circuit and the electrostatic signal line in the touch detection circuit are integrated.

8. The device of claim 4, wherein the signal indicative of the presence/absence of the touch of the dielectric is generated based on a voltage of a first terminal of the touch detection capacitor.

9. The device of claim 8, wherein the touch detection circuit comprises:

a third select element configured to pre-charge the touch detection capacitor in synchronization with a pre-charge signal supplied by a pre-charge signal line; and

a transistor configured to output a voltage depending on the first terminal of the touch detection capacitor, a control terminal of the transistor being connected to the first terminal of the touch detection capacitor.

10. An organic EL display device comprising:

a substrate;

a touch detection capacitor on the substrate configured to detect a presence/absence of a touch of a dielectric;

a first electrode on the substrate;

an organic EL light-emitting element on the first electrode; and

a second electrode on the organic EL light-emitting element and above at least a part of the substrate, the second electrode having an opening above the touch detection capacitor.

11. The device of claim 10 further comprising:

a drive element configured to drive the organic EL light-emitting element;

a first select element configured to supply a pixel voltage to the drive element; and

a second select element configured to output a signal indicative of the presence/absence of the touch of the dielectric detected by the touch detection capacitor to an electrostatic signal line in synchronization with the control signal.

12. The device of claim 10 further comprising a third electrode on the touch detection capacitor.

13. The device of claim 12, wherein a material of the third electrode is identical to a material of the first electrode.

14. The device of claim 10 further comprising:

a sealing glass above the second electrode; and

a circularly polarizing plate on the sealing glass,

wherein the touch detection capacitor is configured to detect the presence/absence of the touch of the dielectric to the circularly polarizing plate.

15. A method for detecting a touch of a dielectric using an organic EL display device comprising a touch detection capacitor, an organic EL light-emitting element, and a drive element configured to drive the organic EL light-emitting element, the touch detection capacitor, the organic EL light-emitting element and the drive element are formed on a first substrate, comprising:

pre-charging a first terminal of the touch detection capacitor by supplying a first signal; and

supplying a pixel voltage to the drive element and reading out a signal indicative of a presence/absence of the touch of the dielectric by supplying a second signal, the signal being based on a voltage of the first terminal.

16. The method of claim 15, wherein pre-charging the first terminal of the touch detection capacitor and a control terminal of the drive element is reset at a predetermined voltage by supplying the first signal.

17. The method of claim 15, wherein upon reading out the signal indicative of the presence/absence of the touch of the dielectric, a second terminal of the touch detection capacitor is supplied with a predetermined voltage.

18. The method of claim 15 further comprising supplying the pixel voltage to another drive element after supplying the first signal and before supplying the second signal.

19. The method of claim 15 further comprising supplying the pixel voltage to another drive element after supplying the second signal.

20. A method for detecting a touch of a dielectric using an organic EL display device comprising a touch detection capacitor, an organic EL light-emitting element, and a drive element configured to drive the organic EL light-emitting element, the touch detection capacitor, the organic EL light-emitting element and the drive element are formed on a first substrate, comprising:

pre-charging a first terminal of the touch detection capacitor and resetting a control terminal of the drive element at a predetermined voltage by supplying a first signal;

reading out a signal indicative of a presence/absence of the touch of the dielectric while supplying a predetermined voltage to a second terminal of the touch detection capacitor, by supplying a second signal the signal being based on a voltage of the first terminal; and

supplying a pixel voltage to the drive element by supplying a third signal.