COMPENSATION SUB-PIXEL UNIT, METHODS OF FABRICATING AND DRIVING THE SAME, AND PIXEL STRUCTURE AND DISPLAY PANEL USING THE SAME

• US 20200135111A1
• Filed: 07/09/2019
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Wang, Jinqian
• Granted Patent: US 10,706,783 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/035 for flexible display surfaces
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H10N 30/1051 based on piezoelectric or electrostrictive films or coatings
• CPC Class Codes: H10N 30/302 Sensors
• CPC Class Codes: H10N 30/802 Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits
• CPC Class Codes: H10N 30/857 Macromolecular compositions
• CPC Class Codes: H10N 39/00 Integrated devices, or assemblies of multiple devices, comprising at least one piezoelectric, electrostrictive or magnetostrictive element covered by groups H10N30/00 – H10N35/00

Abstract

The present disclosure relates to display technology field, particularly to a compensation sub-pixel unit, a method of fabricating the compensation sub-pixel unit, a method of driving the compensation sub-pixel unit, a pixel structure and a display panel. The compensation sub-pixel unit includes a piezoelectric film. The compensation sub-pixel unit includes a switching transistor that has a control end connected to the piezoelectric film layer, and a first end connected to a data voltage signal end. The compensation sub-pixel unit includes a driving transistor that has a control end connected to a gate voltage signal end, a first end connected to a second end of the switching transistor, and a second end connected to a power signal end.

Claims

1. A compensation sub-pixel unit, comprising:

a piezoelectric film;

a switching transistor, having a control end connected to the piezoelectric film, and a first end connected to a data voltage signal end; and

a driving transistor, having a control end connected to a gate voltage signal end, a first end connected to a second end of the switching transistor, and a second end connected to a power signal end.

2. The compensation sub-pixel unit according to claim 1, wherein

the compensation sub-pixel unit further comprises a substrate, and the driving transistor and the switching transistor are formed on the same side of the substrate,

the driving transistor comprises a first active layer, a first gate, a first source and a first drain, the first gate is formed as the control end of the driving transistor, the first source is formed as the first end of the driving transistor, and the first drain is formed as the second end of the driving transistor, and

the switching transistor comprises a second active layer, a second gate, a second source and a second drain, the second gate is formed as the control end of the switching transistor, the second source is formed as the first end of the switching transistor, and the second drain is formed as the second end of the switching transistor.

3. The compensation sub-pixel unit according to claim 2, wherein

the first active layer and the second active layer are disposed in the same layer on the substrate, and the first active layer and the second active layer have an interval therebetween,

a gate insulating layer is further formed on the substrate, and the gate insulating layer covers the first active layer and the second active layer,

the first gate and the second gate are disposed in the same layer on the gate insulating layer, and the first gate and the second gate have an interval therebetween,

an interlayer dielectric layer is further formed on the gate insulating layer, and the interlayer dielectric layer covers the first gate and the second gate, and

the first source, the first drain, the second source and the second drain are disposed in the same layer on the interlayer dielectric layer, the first drain and the first source have an interval therebetween, the first drain and the first source pass through the interlayer dielectric layer and the gate insulating layer in sequence and are in contact with the first active layer, the second drain is connected to the first source and has an interval with the second source, and the second source and the second drain pass through the interlayer dielectric layer and the gate insulating layer in sequence and are in contact with the second active layer.

4. The compensation sub-pixel unit according to claim 3, further comprising:

a passivation layer, covering the interlayer dielectric layer, the first source, the first drain, the second source and the second drain;

a first via hole, disposed in the passivation layer and the interlayer dielectric layer, and exposing a portion of the second gate;

a second via hole, disposed in the passivation layer and the interlayer dielectric layer, and exposing a portion of the gate insulating layer;

a conductive layer, covering a portion of the passivation layer and filled in the first via hole and the second via hole, wherein the conductive layer is contacted with the second gate through the first via hole; and

a conductive hole, disposed in the conductive layer and located in the second via hole,

wherein the piezoelectric film is formed in the conductive hole and electrically connected to the second gate through the conductive layer.

5. The compensation sub-pixel unit according to claim 4, wherein the conductive layer comprises:

a metal conductive layer, contacted with the second gate through the first via hole; and

a transparent conductive layer, electrically connected to the metal conductive layer and filled in the second via hole, wherein the conductive hole is disposed in the transparent conductive layer.

6. The compensation sub-pixel unit according to claim 4, further comprising:

a flat layer, covering the passivation layer, the conductive layer and the piezoelectric film;

an anode layer, covering a portion of the flat layer, passing through the flat layer and the passivation layer in sequence, and being in contact with the first drain;

a pixel definition layer, covering the flat layer and the anode layer;

an organic light emitting layer, disposed in the pixel definition layer, and being in contact with the anode layer; and

a cathode layer, covering the pixel definition layer and the organic light emitting layer, and being in contact with the organic light emitting layer.

7. A method of driving a compensation sub-pixel unit according to claim 1, and the method comprising:

when the piezoelectric film is deformed to generate a voltage control signal, transmitting, by the switching transistor, a data voltage signal provided by the data voltage signal end to the first end of the driving transistor under an action of the voltage control signal, to make the driving transistor drive the compensation sub-pixel unit to emit light when the driving transistor is in an on state.

14. A pixel structure, comprising:

a plurality of pixel units, wherein each of the pixel units comprises a display sub-pixel unit and the compensation sub-pixel unit according to claim 1, and a shape of the display sub-pixel unit and the compensation sub-pixel unit comprises one or more of a rectangle, a diamond, a circle, an ellipse and a triangle.

15. The pixel structure according to claim 14, wherein the pixel unit comprises a first sub-pixel group and a second sub-pixel group,

the first sub-pixel group comprises a first display sub-pixel unit, a second compensation sub-pixel unit and a third display sub-pixel unit that have a same area and are disposed in sequence in a same column,

the second sub-pixel group comprises a first compensation sub-pixel unit, a second display sub-pixel unit and a third compensation sub-pixel unit that have a same area and are disposed in sequence in a same column,

the first display sub-pixel unit and the first compensation sub-pixel unit are disposed in the same row, the second display sub-pixel and the second compensation sub-pixel unit are disposed in a same row, and the third display sub-pixel unit and the third compensation sub-pixel unit are disposed in a same row,

the first display sub-pixel unit, the second display sub-pixel unit and the third display sub-pixel unit are all the display sub-pixel units, and

the first compensation sub-pixel unit, the second compensation sub-pixel unit and the third compensation sub-pixel unit are all the compensation sub-pixel units.

16. The pixel structure according to claim 14, wherein the pixel unit comprises a first sub-pixel group, a second sub-pixel group and a third sub-pixel group,

each of the first sub-pixel group, the second sub-pixel group and the third sub-pixel group comprises a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit that have a same area and are disposed in sequence in a same column, the first sub-pixel unit and the second sub-pixel unit are the display sub-pixel units, and the third sub-pixel unit comprises the display sub-pixel unit and the compensation sub-pixel unit that have a same area and are disposed in a same column,

the first sub-pixel unit in the first sub-pixel group, the third sub-pixel unit in the second sub-pixel group, and the second sub-pixel unit in the third sub-pixel group are disposed in sequence in a same row,

the second sub-pixel unit in the first sub-pixel group, the first sub-pixel unit in the second sub-pixel group, and the third sub-pixel unit in the third sub-pixel group are disposed in sequence in a same row, and

the third sub-pixel unit in the first sub-pixel group, the second sub-pixel unit in the second sub-pixel group, and the first sub-pixel unit in the third sub-pixel group are disposed in sequence in a same row.

17. The pixel structure according to claim 14, wherein the pixel unit comprises a first sub-pixel group, a second sub-pixel group, and a third sub-pixel group,

the first sub-pixel group comprises a first display sub-pixel unit, a second display sub-pixel unit and a third compensation sub-pixel unit that are disposed in sequence in a same column,

the second sub-pixel group comprises a second compensation sub-pixel unit, a first display sub-pixel unit and a third display sub-pixel unit that are disposed in sequence in a same column,

the third sub-pixel group comprises a third display sub-pixel unit, a second display sub-pixel unit and a first compensation sub-pixel unit that are disposed in sequence in a same column,

the first display sub-pixel unit, the second display sub-pixel unit and the third display sub-pixel unit are all the display sub-pixel units, and areas of both the second display sub-pixel unit and the third display sub-pixel unit are one-half of that of the first display sub-pixel unit,

the first compensation sub-pixel unit, the second compensation sub-pixel unit and the third compensation sub-pixel unit are all the compensation sub-pixel units, and areas of both the second compensation sub-pixel unit and the third compensation sub-pixel unit are one-half of that the first compensation sub-pixel unit,

the first display sub-pixel unit has a same area as that of the first compensation sub-pixel unit,

the second display sub-pixel unit has a same area as that of the second compensation sub-pixel unit, and

the third display sub-pixel unit has a same area as that of the third compensation sub-pixel unit.

18. The pixel structure according to claim 14, wherein the pixel unit comprises a first sub-pixel group, a second sub-pixel group, and a third sub-pixel group and a fourth sub-pixel group respectively disposed staggeredly with the first sub-pixel group and the second sub-pixel group,

each the first sub-pixel group and the second sub-pixel group comprises a first display sub-pixel unit and a second display sub-pixel unit that are disposed alternately in a same row, the first display sub-pixel unit and the second display sub-pixel unit are the display sub-pixel units, and an area of the first display sub-pixel unit is larger than that of the second display sub-pixel unit,

each of the third sub-pixel group and the fourth sub-pixel group comprises a third display sub-pixel unit and the compensation sub-pixel unit that are disposed alternately in a same row, the third display sub-pixel unit is the display sub-pixel unit, and an area of the compensation sub-pixel unit is the same as that of the third display sub-pixel unit,

wherein

the first display sub-pixel unit in the first sub-pixel group and the second display sub-pixel unit in the second sub-pixel group are disposed in a same column, and the second display sub-pixel unit in the first sub-pixel group and the first display sub-pixel unit in the second sub-pixel group are disposed in a same column, and

the third display sub-pixel unit in the third sub-pixel group and the compensation sub-pixel unit in the fourth sub-pixel group are disposed in a same column, the compensation sub-pixel unit in the third sub-pixel group and the third display sub-pixel unit in the fourth sub-pixel group are disposed in a same column, and the third display sub-pixel unit and the compensation sub-pixel unit are respectively located among the first display sub-pixel units and the second display sub-pixel units that are adjacent to each other.

19. A display panel, comprising:

the pixel structure according to claim 14.

8. A method of fabricating a compensation sub-pixel unit, comprising:

forming a switching transistor and a driving transistor, wherein a first end of the switching transistor is connected to a data voltage signal end, a second end of the switching transistor is connected to a first end of the driving transistor, a control end of the driving transistor is connected to a gate voltage signal end, and a second end of the driving transistor is connected to a power signal end; and

forming a piezoelectric film connected to a control end of the switching transistor.

9. The method according to claim 8, wherein forming the switching transistor and the driving transistor comprises:

forming the switching transistor and the driving transistor on a same side of a substrate,

wherein,

the driving transistor comprises a first active layer, a first gate, a first source and a first drain, the first gate is formed as the control end of the driving transistor, the first source is formed as the first end of the driving transistor, and the first drain is formed as the second end of the driving transistor, and

the switching transistor comprises a second active layer, a second gate, a second source and a second drain, the second gate is formed as the control end of the switching transistor, the second source is formed as the first end of the switching transistor, and the second drain is formed as the second end of the switching transistor.

10. The method according to claim 9, wherein forming the switching transistor and the driving transistor on the same side of the substrate comprises:

forming the first active layer and the second active layer disposed in the same layer on the substrate, wherein the first active layer and the second active layer have an interval therebetween;

forming a gate insulating layer on the substrate, wherein the gate insulating layer covers the first active layer and the second active layer;

forming the first gate and the second gate disposed in the same layer on the gate insulating layer, wherein the first gate and the second gate have an interval therebetween;

forming an interlayer dielectric layer on the gate insulating layer, wherein the interlayer dielectric layer covers the first gate and the second gate; and

forming the first source, the first drain, the second source and the second drain disposed in the same layer on the interlayer dielectric layer, wherein the first drain and the first source have an interval therebetween, the first drain and the first source pass through the interlayer dielectric layer and the gate insulating layer in sequence and are in contact with the first active layer, the second drain is connected to the first source and have an interval with the second source, and the second source and the second drain passes through the interlayer dielectric layer and the gate insulating layer in sequence and are in contact with the second active layer.

11. The method according to claim 10, after forming the switching transistor and the driving transistor, and before forming the piezoelectric film, further comprising:

forming a passivation layer, wherein the passivation layer covers the interlayer dielectric layer, the first source, the first drain, the second source and the second drain;

forming a first via hole and a second via hole, wherein the first via hole and the second via hole are disposed in the passivation layer and the interlayer dielectric layer, and respectively expose a portion of the second gate and a portion of the gate insulating layer;

forming a conductive layer, wherein the conductive layer covers a portion of the passivation layer and is filled in the first via hole and the second via hole, and is contacted with the second gate through the first via hole; and

forming a conductive hole, wherein the conductive hole is disposed in the conductive layer and located in the second via hole, and the piezoelectric film is formed in the conductive hole and electrically connected to the second gate through the conductive layer.

12. The method according to claim 11, wherein forming the conductive layer comprises:

forming a metal conductive layer, wherein the metal conductive layer is contacted with the second gate through the first via hole; and

forming a transparent conductive layer, wherein the transparent conductive layer is electrically connected to the metal conductive layer and filled in the second via hole, and the conductive hole is disposed in the transparent conductive layer.

13. The method according to claim 11, after forming the piezoelectric film, further comprising:

forming a flat layer, wherein the flat layer covers the passivation layer, the conductive layer and the piezoelectric film;

forming an anode layer, wherein the anode layer covers a portion of the flat layer, and passes through the flat layer and the passivation layer in sequence and is in contact with the first drain;

forming a pixel definition layer, wherein the pixel definition layer covers the flat layer and the anode layer;

forming an organic light emitting layer, wherein the organic light emitting layer is disposed in the pixel definition layer, and is in contact with the anode layer; and

forming a cathode layer, wherein the cathode layer covers the pixel definition layer and the organic light emitting layer, and is in contact with the organic light emitting layer.