Driving circuit of active-matrix organic light-emitting diode with hybrid transistors

• US 10,332,446 B2
• Filed: 11/30/2016
• Issued: 06/25/2019
• Est. Priority Date: 12/03/2015
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Chen, Lien-Hsiang, Kuo, Kung-Chen, Tseng, Ming-Chun, Chou, Cheng-Hsu, Lee, Kuan-Feng
• Primary Examiner(s): Lam, Vinh T
• Application Number:
  US15/364,350
• Publication Number:
  US 20170162115A1
• Time in Patent Office: 937 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with 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 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs

Abstract

A driving circuit includes a current drive unit and a reset compensation and light emitting control circuit. The current drive unit includes a first transistor and a second transistor. The first transistor and the second transistor are connected in series, wherein the first transistor and the second transistor include a silicon semiconductor layer. The reset compensation and light emitting control circuit is coupled to the current drive unit. The reset compensation and light emitting control circuit includes a third transistor connected to a control terminal of the first transistor, wherein the third transistor is an oxide semiconductor transistor.

Claims

1. A driving circuit comprising:

a current drive unit including a first transistor and a second transistor, wherein the first transistor and the second transistor are connected in series, and wherein the first transistor and the second transistor comprise a silicon semiconductor layer; and

a reset compensation and light emitting control circuit coupled to the current drive unit, the reset compensation and light emitting control circuit comprising a third transistor connected to a control terminal of the first transistor, wherein the third transistor comprises an oxide semiconductor layer;

wherein the reset compensation and light emitting control circuit further includes a first capacitor, a second capacitor, a fourth transistor, a fifth transistor and a sixth transistor; and

the current drive unit further comprises a seventh transistor;

the first transistor has a first terminal connected to a second terminal of the fourth transistor and a second terminal of the seventh transistor, and a second terminal connected to a first terminal of the second transistor and a first terminal of the third transistor;

the second transistor has a second terminal connected to an organic light-emitting diode and a first terminal of the sixth transistor, and a control terminal connected a first control signal;

the third transistor has a second terminal connected to a control terminal of the first transistor, one terminal of the first capacitor, one terminal of the second capacitor and a first terminal of the fifth transistor, and a control terminal connected to a second control signal and the other terminal of the second capacitor;

the other terminal of the first capacitor is connected to a low level;

the fourth transistor has a first terminal connected to a data line, a control terminal connected to the second control signal;

the fifth transistor has a second terminal connected to a third control signal and a second terminal of the sixth transistor, and a control terminal connected to a four control signal;

the sixth transistor has a control terminal connected to a fifth control signal;

the seventh transistor has a first terminal connected to the high level, and a control terminal connected to the first control signal;

wherein the fifth transistor is an oxide semiconductor transistor and the seventh transistor is a low temperature poly-silicon transistor.

2. A display device, the display device comprising:

a substrate,

a display media disposed above the substrate,

a current drive unit disposed above the substrate, the current drive unit including a first transistor and a second transistor, wherein the first transistor and the second transistor are connected in series, and wherein the first transistor and the second transistor comprise a silicon semiconductor layer; and

a reset compensation and light emitting control circuit coupled to the current drive unit, the reset compensation and light emitting control circuit comprising a third transistor connected to a control terminal of the first transistor, wherein the third transistor comprises an oxide semiconductor layer;

wherein the reset compensation and light emitting control circuit further includes a first capacitor, a second capacitor, a fourth transistor, a fifth transistor and a sixth transistor; and

the current drive unit further comprises a seventh transistor;

the first transistor has a first terminal connected to a second terminal of the fourth transistor and a second terminal of the seventh transistor, and a second terminal connected to a first terminal of the second transistor and a first terminal of the third transistor;

the second transistor has a second terminal connected to an organic light-emitting diode and a first terminal of the sixth transistor, and a control terminal connected a first control signal;

the third transistor has a second terminal connected to a control terminal of the first transistor, one terminal of the first capacitor, one terminal of the second capacitor and a first terminal of the fifth transistor, and a control terminal connected to a second control signal and the other terminal of the second capacitor;

the other terminal of the first capacitor is connected to a low level;

the fourth transistor has a first terminal connected to a data line, a control terminal connected to the second control signal;

the fifth transistor has a second terminal connected to a third control signal and a second terminal of the sixth transistor, and a control terminal connected to a four control signal;

the sixth transistor has a control terminal connected to a fifth control signal;

the seventh transistor has a first terminal connected to the high level, and a control terminal connected to the first control signal;

wherein the fifth transistor is an oxide semiconductor transistor and the seventh transistor is a low temperature poly-silicon transistor.