IP Library › Granted Patent US 10,242,624
Granted Patent B2
US 10,242,624 · App. 15/224,736 · Granted Mar 26, 2019

Display device

Inventors: Lien-Hsiang Chen (Miao-Li County, TW); Kung-Chen Kuo (Miao-Li County, TW); Ming-Chun Tseng (Miao-Li County, TW)
Assignee: INNOLUX CORPORATION
G09G3/3258G09G3/3291G09G2300/043G09G2310/0202G09G2310/08G09G2320/0233
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Quick Facts
Patent No.
US 10,242,624
App. No.
15/224,736
Granted
Mar 26, 2019
Kind
B2
Abstract

A driving device includes a pixel array, a controller and a driver. The driver has a plurality of driving devices. Each of the driving devices includes a plurality of transistors and at least one capacitor to drive a light emitting device. By controlling the timing scheme of control signals applied to the driving device, the voltage for driving the light emitting device would not be affected by threshold voltages of the transistors.

Claims (70)

1. A display device, comprising:

a pixel array;

a driver, having a plurality of driving devices; and

a controller, generating image signals and transmitting the image signals to the driver to show the image signals on the pixel array;

each of the driving devices comprising:

a first transistor having a first terminal coupled to a first node, a second terminal coupled to a second node, and a gate terminal coupled to a third node;

a second transistor having a first terminal coupled to the first node, a second terminal coupled to the third node, and a gate terminal to receive a first control signal;

a third transistor having a first terminal coupled to the second node, a second terminal to receive a display signal, and a gate terminal to receive a second control signal;

a fourth transistor having a first terminal coupled to a light-emitting device, a second terminal coupled to the first node, and a gate terminal to receive a third control signal;

a fifth transistor having a first terminal coupled to a high voltage signal, a second terminal coupled to the second node, and a gate terminal to receive a fourth control signal;

a capacitor having a first terminal coupled to the high voltage signal and a second terminal coupled to the third node; and

the light-emitting device having a first terminal coupled to a low voltage signal and a second terminal coupled to the first terminal of the fourth transistor, wherein an operation flow of the driving device comprises steps of:

at a first time point, the fourth control signal is at a high voltage logic level to turn off the fifth transistor, and the third control signal is at a low voltage logic level to turn on the fourth transistor;

at a second time point, the third control signal is changed to the high voltage logic level to turn off the fourth transistor; and

at a third time point, the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

2. The display device as claimed in claim 1 , wherein an operation flow of the driving device comprises steps of:

at a first time point, the second control signal and the fourth control signal are at a high voltage logic level to turn off the third transistor and the fifth transistor, and the first control signal and the third control signal are at a low voltage logic level to turn on the second transistor and the fourth transistor;

at a second time point, the second control signal is changed to the low voltage logic level to turn on the third transistor, and the third control signal is changed to the high voltage logic level to turn off the fourth transistor; and

at a third time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

3. The display device as claimed in claim 1 , wherein the first control signal is the same as the second control signal, an operation flow of the driving device comprises steps of:

at a first time point, the first control signal, the second control signal, and the third control signal are at a low voltage logic level to turn on the second transistor, the third transistor and the fourth transistor, and the fourth control signal is at a high voltage logic level to turn off the fifth transistor;

at a second time point, the third control signal is changed to the high voltage logic level to turn off the fourth transistor; and

at a third time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

4. The display device as claimed in claim 1 , wherein the third control signal is the same as the fourth control signal, and an operation flow of the driving device comprises steps of:

at a first time point, the second control signal is at a high voltage logic level to turn off the third transistor, and the first control signal, the third control signal and the fourth control signal are at a low voltage logic level to turn on the second transistor, the fourth transistor and the fifth transistor;

at a second time point, the third control signal and the fourth control signal are changed to the high voltage logic level to turn off the fourth transistor and the fifth transistor;

at a third time point, the second control signal is changed to the low voltage logic level to turn on the third transistor; and

at a fourth time point, the second control signal is changed to the high voltage logic level to turn off the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

5. The display device as claimed in claim 1 , wherein the first control signal is the same as the second control signal, the third control signal is the same as the fourth control signal, and an operation flow of the driving device comprises steps of:

at a first time point, the first control signal, the second control signal, the third control signal and the fourth control signal are at a low voltage logic level to turn on all transistors of the driving device;

at a second time point, the third control signal and the fourth control signal are changed to a high voltage logic level to turn off the fourth transistor and the fifth transistor;

at a third time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor;

at a fourth time point, the first control signal and the second control signal are changed to the low voltage logic level to turn on the second transistor and the third transistor;

at a fifth time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

6. A display device, comprising:

a pixel array;

a driver, having a plurality of driving devices; and

a controller, generating image signals and transmitting the image signals to the driver to show the image signals on the pixel array;

each of the driving devices comprising:

a first transistor having a first terminal coupled to a first node, a second terminal coupled to a second node, and a gate terminal coupled to a third node;

a second transistor having a first terminal coupled to the first node, a second terminal coupled to the third node and a gate terminal to receive a first control signal;

a third transistor having a first terminal coupled to the second node, a second terminal to receive a display signal, and a gate terminal to receive a second control signal;

a fourth transistor having a first terminal coupled to a fourth node, a second terminal coupled to the first node, and a gate terminal to receive a third control signal;

a fifth transistor having a first terminal coupled to a high voltage signal, a second terminal couple to the second node, and a gate terminal to receive a fourth control signal;

a sixth transistor having a first terminal coupled to a reference voltage signal, a second terminal coupled to the fourth node, and a gate terminal to receive a reset signal;

a capacitor having a first terminal coupled to the high voltage signal, and a second terminal coupled to the third node, and

a light-emitting device having a first terminal coupled to a low voltage signal and a second terminal coupled to the fourth node, wherein an operation flow of the driving device comprises steps of:

at a first time point, the fourth control signal is at a high voltage logic level to turn off the fifth transistor, and the third control signal is at a low voltage logic level to turn on the fourth transistor;

at a second time point, the third control signal is changed to the high voltage logic level to turn off the fourth transistor; and

at a third time point, the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

7. The display device as claimed in claim 6 , wherein an operation flow of the driving device comprises steps of:

at a first time point, the second control signal is at a high voltage logic level to turn off the third transistor, and the reset signal and the first control signal are at a low voltage logic level to turn on the sixth transistor and the second transistor;

at a second time point, the second control signal is changed to the low voltage logic level to turn on the third transistor, and the reset signal is changed to the high voltage logic level to turn off the sixth transistor; and

at a third time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor.

8. The display device as claimed in claim 6 , wherein the first control signal is the same as the second control signal, an operation flow of the driving device comprises steps of:

at a first time point, the fourth control signal is at a high voltage logic level to turn off the fifth transistor, the reset signal, the first control signal, the second control signal, and the third control signal are at a low voltage logic level to turn on the sixth transistor, the second transistor, the third transistor and the fourth transistor;

at a second time point, the third control signal is changed to the high voltage logic level to turn off the fourth transistor; and

at a third time point, the reset signal, the first control signal and the second control signal are changed to the high voltage logic level to turn off the sixth transistor, the second transistor and the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

9. The display device as claimed in claim 6 , wherein the third control signal is the same as the fourth control signal, and an operation flow of the driving device comprises steps of:

at a first time point, the second control signal is at a high voltage logic level to turn off the third transistor, and the reset signal, the first control signal, the third control signal and the fourth control signal are at a low voltage logic level to turn on the sixth transistor, the second transistor, the fourth transistor and the fifth transistor;

at a second time point, the third control signal and the fourth control signal are changed to the high voltage logic level to turn off the fourth transistor and the fifth transistor;

at a third time point, the second control signal is changed to the low voltage logic level to turn on the third transistor;

at a fourth time point, the reset signal is changed to the high voltage logic level to turn off the sixth transistor; and

at a fifth time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the second transistor, the fourth transistor and the fifth transistor.

10. The display device as claimed in claim 6 , wherein the reset signal, the first control signal and the second control signal are the same, the third control signal is the same as the fourth control signal, and an operation flow of the driving device comprises steps of:

at a first time point, the reset signal, the first control signal, the second control signal, the third control signal and the fourth control signal are at a low voltage logic level to turn on all transistors of the driving device;

at a second time point, the third control signal and the fourth control signal are changed to a high voltage logic level to turn off the fourth transistor and the fifth transistor;

at a third time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor;

at a fourth time point, the first control signal and the second control signal are changed to the low voltage logic level to turn on the second transistor and the third transistor;

at a fifth time point, the first control signal and the second control signal are changed to the high voltage logic level to turn off the second transistor and the third transistor, and the third control signal and the fourth control signal are changed to the low voltage logic level to turn on the fourth transistor and the fifth transistor.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 1, 2016
From: CHEN, LIEN-HSIANG; KUO, KUNG-CHEN; TSENG, MING-CHUN
To: INNOLUX CORPORATION
Reel/Frame 039301/0098 →
Priority Claims (1)
CN 2015 1 0495669 · Aug 13, 2015 · national
Continuity (1)
Related Publication 20170047010A1 · Feb 16, 2017
Cited By (1)
US 12,380,848