Pixel unit having first and second light shielding layers and method for manufacturing the same, display panel and method for driving the same

• US 10,788,691 B2
• Filed: 01/09/2019
• Issued: 09/29/2020
• Est. Priority Date: 04/17/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Li, Zhongxiao, Zhao, Wenqing
• Primary Examiner(s): Landis, Lisa S
• Application Number:
  US16/243,720
• Publication Number:
  US 20190317343A1
• Time in Patent Office: 629 Days
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2320/068 for control of viewing angle adjustment
• CPC Class Codes: G09G 2358/00 Arrangements for display data security
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

The present disclosure provides a pixel unit and a method for manufacturing the same, a display panel and a method for driving the same. The pixel unit includes: a first substrate; an intermediate stack disposed on the first substrate; a first light shielding layer disposed on one side of the intermediate stack adjacent to the first substrate, wherein the first light shielding layer has an opening provided therein; and a second light shielding layer disposed on one side of the intermediate stack away from the first substrate. The second light shielding layer is disposed so that projection of the opening on the first substrate is located within projection of the second light shielding layer on the first substrate.

Claims

1. A pixel unit, comprising:

a first substrate;

an intermediate stack disposed on the first substrate;

a first light shielding layer disposed on a side of the intermediate stack adjacent to the first substrate, wherein the first light shielding layer has an opening provided therein; and

a second light shielding layer disposed on a side of the intermediate stack away from the first substrate;

wherein the second light shielding layer is disposed so that projection of the opening on the first substrate is located within projection of the second light shielding layer on the first substrate;

wherein the first light shielding layer and the second light shielding layer are configured to satisfy the following formula;

b=a+tan θ

1×

h+tan θ

2×

h,

where a represents a width of the opening, b represents a width of the second light shielding layer, h represents a distance between the first light shielding layer and the second light shielding layer, θ

1 represents an angle of a light path from an edge of the opening to an edge of the second light shielding layer on one side of the opening with respect to a normal of the first substrate, and θ

2 represents an angle of a light path from an edge of the opening to an edge of the second light shielding layer on the other side of the opening opposite to said one side with respect to the normal of the first substrate.

2. The pixel unit according to claim 1, further comprising a second substrate disposed on the intermediate stack, wherein:

the second light shielding layer is disposed in the second substrate; and

the first light shielding layer is disposed on the first substrate and is at least partially covered by the intermediate stack.

3. The pixel unit according to claim 1, wherein a center of the projection of the opening on the first substrate coincides with a center of the projection of the second light shielding layer on the first substrate.

4. The pixel unit according to claim 1, wherein a center of the projection of the opening on the first substrate deviates from a center of the projection of the second light shielding layer on the first substrate.

5. The pixel unit according to claim 1, wherein the opening has a slit shape.

6. The pixel unit according to claim 1, wherein each of the first light shielding layer and the second light shielding layer is a black matrix.

7. The pixel unit according to claim 1, wherein the intermediate stack comprises:

a first flat layer disposed on the first substrate to at least partially cover the first light shielding layer;

a common electrode disposed on the first flat layer;

an insulating layer disposed on the common electrode;

a pixel electrode disposed on the insulating layer;

a liquid crystal layer disposed on the pixel electrode; and

a second flat layer disposed on the liquid crystal layer.

8. A display panel, comprising:

a plurality of display pixel units arranged in an array; and

at least one interfering pixel unit distributed in the array, wherein each of the at least one interfering pixel unit is implemented using the pixel unit according to claim 1.

9. The display panel according to claim 8, wherein the at least one interfering pixel unit is disposed between respective adjacent ones of the display pixel units.

10. The display panel according to claim 8, wherein each of the display pixel units comprises a plurality of sub-pixels, and the at least one interfering pixel unit is disposed between respective adjacent ones of the sub-pixels.

11. The display panel according to claim 8, wherein the at least one interfering pixel unit comprises a first interfering pixel unit and a second interfering pixel unit, wherein the first interfering pixel unit is different from the second interfering pixel unit in at least one of:

a width of an opening, a width of a second light shielding layer, a distance between a first light shielding layer and the second light shielding layer, and an offset value of a center of projection of the second light shielding layer on a first substrate with respect to a center of projection of the opening on the first substrate.

12. The display panel according to claim 11, wherein the first interfering pixel unit and the second interfering pixel unit are distributed in the array in a periodically repeating manner.

13. A method for manufacturing a pixel unit that includes:

a first substrate;

an intermediate stack disposed on the first substrate;

a first light shielding layer disposed on a side of the intermediate stack adjacent to the first substrate, wherein the first light shielding layer has an opening provided therein; and

a second light shielding layer disposed on a side of the intermediate stack away from the first substrate, wherein the second light shielding layer is disposed so that projection of the opening on the first substrate is located within projection of the second light shielding layer on the first substrate, the method comprising;

forming the first substrate;

forming the first light shielding layer on the first substrate;

forming the opening in the first light shielding layer;

forming the intermediate stack on the first light shielding layer; and

forming the second light shielding layer on the intermediate stack, so that projection of the opening on the first substrate is located within projection of the second light shielding layer on the first substrate;

wherein the first light shielding layer and the second light shielding layer are formed with a configuration that satisfies the following formula;

b=a+tan θ

1×

h+tan θ

2×

h,

where a represents a width of the opening, b represents a width of the second light shielding layer, h represents a distance between the first light shielding layer and the second light shielding layer, θ

1 represents an angle of a light path from an edge of the opening to an edge of the second light shielding layer on one side of the opening with respect to a normal of the first substrate, and θ

2 represents an angle of a light path from an edge of the opening to an edge of the second light shielding layer on the other side of the opening opposite to said one side with respect to the normal of the first substrate.

14. A method for driving a display panel that comprises a plurality of display pixel units arranged in an array and at least one interfering pixel unit distributed in the array, wherein each of the at least one interfering pixel unit is implemented using a pixel unit that includes:

a first substrate;

an intermediate stack disposed on the first substrate;

a first light shielding layer disposed on a side of the intermediate stack adjacent to the first substrate, wherein the first light shielding layer has an opening provided therein; and

a second light shielding layer disposed on a side of the intermediate stack away from the first substrate, wherein the second light shielding layer is disposed so that projection of the opening on the first substrate is located within projection of the second light shielding layer on the first substrate, and wherein the the first light shielding layer and the second light shielding layer are configured to satisfy the following formula;

b=a+tan θ

1×

h+tan θ

2×

h,

where a represents a width of the opening, b represents a width of the second light shielding layer, h represents a distance between the first light shielding layer and the second light shielding layer, θ

1 represents an angle of a light path from an edge of the opening to an edge of the second light shielding layer on one side of the opening with respect to a normal of the first substrate, and θ

2 represents an angle of a light path from an edge of the opening to an edge of the second light shielding layer on the other side of the opening opposite to said one side with respect to the normal of the first substrate,

the method comprising;

in a normal display mode, providing a display data signal to display pixel units in the display panel; and

in an anti-peep display mode, providing the display data signal to the display pixel units in the display panel, and providing an interference data signal to at least a part of the at least one interfering pixel unit in the display panel.

15. The method according to claim 14, wherein the interfering pixel units are disabled in the normal display mode.

16. The method according to claim 14, wherein the interfering pixel units comprise a first interfering pixel unit and a second interfering pixel unit, wherein the first interfering pixel unit is different from the second interfering pixel unit in at least one of:

a width of the opening, a width of the second light shielding layer, a distance between the first light shielding layer and the second light shielding layer, and an offset value of a center of projection of the second light shielding layer on the first substrate relative to a center of projection of the opening on the first substrate, and the method further comprises;

in the anti-peep display mode, selecting one or both of the first interfering pixel unit and the second interfering pixel unit according to an angle range desired for picture presentation, wherein said providing an interference data signal comprises providing the interference data signal to the selected interfering pixel unit(s).

17. The method according to claim 16, further comprising:

identifying a position where an observer is located through biometric identification; and

determining the angle range desired for picture presentation according to the position where the observer is located.

18. The method according to claim 14, wherein the interference data signal is a Voltage OPerating (VOP) signal for the display panel.