IP Library Granted Patent US 9,299,287
Granted Patent B2
US 9,299,287 · App. 13/632,228 · Granted Mar 29, 2016

Self-luminous display device and driving method of the same including a light emission interruption period during a light emission enabled period

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Quick Facts
Patent No.
US 9,299,287
App. No.
13/632,228
Granted
Mar 29, 2016
Kind
B2
Abstract

A self-luminous display device includes: pixel circuits; and a drive circuit, wherein each of the pixel circuits includes a light-emitting diode, a drive transistor connected to a drive current channel of the light-emitting diode, and a holding capacitor coupled to a control node of the drive transistor, the drive circuit applies a light emission enabling bias to the light-emitting diode after correcting the drive transistor and writing a data voltage to the control node, provides, during a light emission enabled period in which the light emission enabling bias is applied, a light emission interruption period adapted to change the light emission enabling bias to a non-light emission bias with the data voltage held by the holding capacitor, and performs a light emission disabling process, adapted to reverse-bias the light-emitting diode to stop the light emission, for a constant period after the light emission enabled period.

Claims (33)

1. A self-luminous display device comprising:

pixel circuits; and

a drive circuit, wherein

at least one of the pixel circuits includes a light-emitting diode, a drive transistor connected to provide a drive current to the light-emitting diode according to an input data voltage, and a holding capacitor coupled to a control node of the drive transistor,

the drive circuit is configured to apply a light emission enabling bias to the light-emitting diode after the input data voltage is written to the holding capacitor, and

the drive circuit is configured to provide a light emission enabled period and a light emission disabled period, and wherein

during the light emission enabled period, the light emission enabling bias is applied to the light-emitting diode,

a light emission interruption period adapted to change the light emission enabling bias to a non-light emission bias is inserted halfway into the light emission enabled period,

during a remainder of the light emission enabled period immediately following a conclusion of the light emission interruption period, a source potential of the drive transistor increases to a level commensurate with the input data voltage, and

during the light emission disabled period, a reverse-bias of the light-emitting diode is provided to stop light emission, for a constant period after the light emission enabled period,

wherein a voltage corresponding to a correction for a characteristic of the drive transistor is reflected in the holding capacitor prior to the light emission interruption period.

2. The self-luminous display device of claim 1 , wherein the input data voltage held by the holding capacitor is initialized during the light emission disabled period.

3. The self-luminous display device of claim 1 , wherein a period of time from the beginning of the correction of the drive transistor to the end of the light emission disabled period is a constant screen display period, and the drive circuit controls the length of the light emission enabled period during which the light-emitting diode actually emits light by changing the length of the light emission interruption period.

4. The self-luminous display device of claim 1 , wherein the drive circuit is configured to stop the light emission of the light-emitting diode by reverse-biasing the same diode during the light emission interruption period and light emission disabled period in which the light emission disabling process is performed.

5. The self-luminous display device of claim 1 , wherein the drive circuit is configured to perform a false light emission, wherein light emission is prevented although the light emission enabling bias is applied to the light-emitting diode, for a predetermined period at the beginning of the light emission enabled period, and the drive circuit is configured to change the light emission enabling bias to the non-light emission bias when the light emission interruption period begins after the false light emission and changes the non-light emission bias back to the light emission enabling bias after elapse of a predetermined period.

6. The self-luminous display device of claim 1 , wherein the drive circuit is configured to perform a false light emission, wherein light emission is prevented although the light emission enabling bias is applied to the light-emitting diode, for a predetermined period at the end of the light emission enabled period, and the drive circuit is configured to change the light emission enabling bias to the non-light emission bias and initializes the held voltage when the light emission disabling process begins after the false light emission.

7. The self-luminous display device of claim 1 , wherein the drive circuit is configured to repeat the light emission enabled period, long enough for the light-emitting diode to be able to actually emit light, and the light emission interruption period a predetermined number of times during the light emission enabled period.

8. An electronic apparatus comprising the self-luminous display device of claim 1 .

9. A method of driving a self-luminous display device, the self-luminous display device including pixel circuits, at least one of the pixel circuits including a light-emitting diode, a drive transistor connected to provide a drive current to the light-emitting diode according to an input data voltage, and a holding capacitor coupled to a control node of the drive transistor, the method comprising:

applying, by the drive circuit, a light emission enabling bias to the light-emitting diode after the input data voltage is written to the holding capacitor; and

providing, by the drive circuit, a light emission enabled period and a light emission disabled period, wherein

during the light emission enabled period, the light emission enabling bias is applied to the light-emitting diode,

a light emission interruption period adapted to change the light emission enabling bias to a non-light emission bias is inserted halfway into the light emission enabled period,

during a remainder of the light emission enabled period immediately following a conclusion of the light emission interruption period, a source potential of the drive transistor increases to a level commensurate with the input data voltage, and

during the light emission disabled period, a reverse-bias of the light-emitting diode is provided to stop light emission, for a constant period after the light emission enabled period,

wherein a voltage corresponding to a correction for a characteristic of the drive transistor is reflected in the holding capacitor prior to the light emission interruption period.

10. The method of claim 9 , wherein the input data voltage held by the holding capacitor is initialized during the light emission disabled period.

11. The method of claim 9 , wherein a period of time from the beginning of the correction of the drive transistor to the end of the light emission disabled period is a constant screen display period, and the drive circuit controls the length of the light emission enabled period during which the light-emitting diode actually emits light by changing the length of the light emission interruption period.

12. The electronic apparatus of claim 8 , wherein the input data voltage held by the holding capacitor is initialized during the light emission disabled period.

13. The electronic apparatus of claim 8 , wherein a period of time from the beginning of the correction of the drive transistor to the end of the light emission disabled period is a constant screen display period, and the drive circuit controls the length of the light emission enabled period during which the light-emitting diode actually emits light by changing the length of the light emission interruption period.

14. The electronic apparatus of claim 8 , wherein the drive circuit is configured to stop the light emission of the light-emitting diode by reverse-biasing the same diode during the light emission interruption period and light emission disabled period in which the light emission disabling process is performed.

15. The electronic apparatus of claim 8 , wherein the drive circuit is configured to perform a false light emission, wherein light emission is prevented although the light emission enabling bias is applied to the light-emitting diode, for a predetermined period at the beginning of the light emission enabled period, and the drive circuit is configured to change the light emission enabling bias to the non-light emission bias when the light emission interruption period begins after the false light emission and changes the non-light emission bias back to the light emission enabling bias after elapse of a predetermined period.

16. The electronic apparatus of claim 8 , wherein the drive circuit is configured to perform a false light emission, wherein light emission is prevented although the light emission enabling bias is applied to the light-emitting diode, for a predetermined period at the end of the light emission enabled period, and the drive circuit is configured to change the light emission enabling bias to the non-light emission bias and initializes the held voltage when the light emission disabling process begins after the false light emission.

Assignments (5)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 18, 2025
From: JDI DESIGN AND DEVELOPMENT G.K.
To: MAGNOLIA BLUE CORPORATION
Reel/Frame 072039/0656 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 31, 2024
From: JOLED, INC.
To: JDI DESIGN AND DEVELOPMENT G.K.
Reel/Frame 066382/0619 →
CORRECTION BY AFFIDAVIT FILED AGAINST REEL/FRAME 063396/0671 Recorded Jun 12, 2023
From: JOLED, INC.
To: JOLED, INC.
Reel/Frame 064067/0723 →
SECURITY INTEREST Recorded Apr 20, 2023
From: JOLED, INC.
To: INCJ, LTD.
Reel/Frame 063396/0671 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 10, 2015
From: SONY CORPORATION
To: JOLED INC.
Reel/Frame 036090/0968 →