Polarizer, manufacturing method thereof, liquid crystal display panel and display device

• US 10,203,544 B2
• Filed: 07/10/2015
• Issued: 02/12/2019
• Est. Priority Date: 03/31/2015
• Status: Expired due to Fees

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Fang, Kaidi, Zhu, Zhengwei
• Primary Examiner(s): Nguyen, Thanh Nhan P
• Application Number:
  US14/912,906
• Publication Number:
  US 20170038639A1
• Time in Patent Office: 1,313 Days
• Field of Search: 349 43, 349 46, 349110
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• 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 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

The embodiments of the present invention disclose a polarizer, a manufacturing method thereof, a liquid crystal display panel and a display device. The polarizer comprises: a polarizing film and a shielding layer located on the polarizing film; wherein the shielding layer comprises a shielding portion for at least covering channels of thin film transistors in the liquid crystal display panel; when the polarizer is used as a lower polarizer in the liquid crystal display panel, the shielding layer additionally arranged on the polarizer can shield the channels of the thin film transistors in the liquid crystal display panel so as to enable them not to be irradiated by the backlight, in this way, it can avoid the thin film transistors from generating leakage current when the channels of the thin film transistors are irradiated by the backlight, thereby being capable of avoiding the liquid crystal display panel from generating defects such as flicker and crosstalk, which may influence the display quality of the liquid crystal display panel.

Claims

1. A polarizer applied in a liquid crystal display panel, comprising:

a polarizing film and a shielding layer located on the polarizing film;

the shielding layer comprising a shielding portion for at least covering channels of thin film transistors in the liquid crystal display panel;

wherein the shielding portion and a black matrix in the liquid crystal display panel have consistent shapes, same size and corresponding positions.

2. The polarizer as claimed in claim 1, wherein the shielding layer comprises a plurality of shielding portions in one-to-one correspondence with the thin film transistors in the liquid crystal display panel;

a shape of each of the shielding portions is consistent with a shape of a corresponding thin film transistor, a size of each of the shielding portions is greater than or equal to a size of a corresponding thin film transistor.

3. The polarizer as claimed in claim 1, wherein the material of the shielding portion is a material of a black matrix in the liquid crystal display panel.

4. A liquid crystal display panel comprising:

a liquid crystal cell, an upper polarizer and a lower polarizer;

wherein the liquid crystal cell is arranged between the upper polarizer and the lower polarizer;

wherein;

the lower polarizer is the polarizer as claimed in claim 1.

5. The liquid crystal display panel as claimed in claim 4, wherein the liquid crystal cell comprises:

a counter substrate and an array substrate arranged oppositely, and a liquid crystal layer located between the counter substrate and the array substrate;

wherein thin film transistor are arranged at a side of the array substrate facing the liquid crystal layer;

each thin film transistor comprises;

a gate electrode and an active layer insulated from each other, a source electrode and a drain electrode electrically connected with the active layer respectively;

wherein the source electrode and the drain electrode are both located over the active layer;

the gate electrode is located below the active layer.

6. The liquid crystal display panel as claimed in claim 4, wherein the liquid crystal cell comprises:

a counter substrate and an array substrate arranged oppositely, and a liquid crystal layer located between the counter substrate and the array substrate;

wherein thin film transistors are arranged at a side of the array substrate facing the liquid crystal layer;

each thin film transistor comprises;

a gate electrode and an active layer insulated from each other, a source electrode and a drain electrode electrically connected with the active layer respectively;

wherein the source electrode and the drain electrode are both located over the active layer;

the gate electrode is located over the source electrode and the drain electrode.

7. A display device, comprising:

a liquid crystal display panel as claimed in claim 4 and a backlight module;

wherein the lower polarizer in the liquid crystal display panel is close to the backlight module.

8. The display device as claimed in claim 7, wherein the shielding layer comprises a plurality of shielding portions in one-to-one correspondence with the thin film transistors in the liquid crystal display panel;

a shape of each of the shielding portions is consistent with a shape of a corresponding thin film transistor, a size of each of the shielding portions is greater than or equal to a size of a corresponding thin film transistor.

9. The display device as claimed in claim 7, wherein the material of the shielding portion is a material of a black matrix in the liquid crystal display panel.

10. The display device as claimed in claim 7, wherein the liquid crystal cell comprises:

a counter substrate and an array substrate arranged oppositely, and a liquid crystal layer located between the counter substrate and the array substrate;

wherein thin film transistor are arranged at a side of the array substrate facing the liquid crystal layer;

each thin film transistor comprises;

a gate electrode and an active layer insulated from each other, a source electrode and a drain electrode electrically connected with the active layer respectively;

wherein the source electrode and the drain electrode are both located over the active layer;

the gate electrode is located below the active layer.

11. The display device as claimed in claim 7, wherein the liquid crystal cell comprises:

a counter substrate and an array substrate arranged oppositely, and a liquid crystal layer located between the counter substrate and the array substrate;

wherein thin film transistors are arranged at a side of the array substrate facing the liquid crystal layer;

each thin film transistor comprises;

a gate electrode and an active layer insulated from each other, a source electrode and a drain electrode electrically connected with the active layer respectively;

wherein the source electrode and the drain electrode are both located over the active layer;

the gate electrode is located over the source electrode and the drain electrode.

12. A method of manufacturing the polarizer as claimed in claim 1, the polarizer being applied in a liquid crystal display panel, comprising:

forming a polarizing film;

forming a shielding layer on the polarizing film;

wherein the shielding layer comprises a shielding portion for at least covering channels of thin film transistors in the liquid crystal display panel; and

wherein forming a shielding layer comprises;

forming a pattern of a shielding portion having consistent shape, same size and corresponding position with a black matrix in the liquid crystal display panel using a composition process.

13. The method as claim in claim 12, wherein forming a shielding layer comprises:

forming patterns of a plurality of shielding portions in one-to-one correspondence with the thin film transistors in the liquid crystal display panel using a composition process;

wherein a shape of each of the shielding portions is consistent with a shape of a corresponding thin film transistor, a size of each of the shielding portions is greater than or equal to a size of a corresponding thin film transistor.

14. The method as claimed in claim 12, wherein forming a shielding layer comprises:

forming a shielding portion using a material of a black matrix in the liquid crystal display panel.

15. The liquid crystal display panel as claimed in claim 4, wherein the shielding layer comprises a plurality of shielding portions in one-to-one correspondence with the thin film transistors in the liquid crystal display panel;

a shape of each of the shielding portions is consistent with a shape of a corresponding thin film transistor, a size of each of the shielding portions is greater than or equal to a size of a corresponding thin film transistor.

16. The liquid crystal display panel as claimed in claim 4, wherein the material of the shielding portion is a material of a black matrix in the liquid crystal display panel.