Light source module and display device

• US 10,429,572 B2
• Filed: 03/28/2017
• Issued: 10/01/2019
• Est. Priority Date: 05/12/2016
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Coretronic Corporation
• Inventors: Liu, Chin-Ku, Li, Ching-Hsiang, Lee, Chien-Hui
• Primary Examiner(s): Caley, Michael H
• Assistant Examiner(s): Qureshi, Mariam
• Application Number:
  US15/470,931
• Publication Number:
  US 20170329073A1
• Time in Patent Office: 917 Days
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133538 with spatial distribution of the polarisation direction
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/13362 providing polarized light, e.g. by converting a polarisation component into another one
• CPC Class Codes: G02F 1/133626 providing two modes of illumination, e.g. day-night

Abstract

A light source module including a first backlight module, a second backlight module, a turning film, and a first absorptive polarizer film is provided. The first backlight module has a first side and a second side. The first backlight module includes a first light guide plate (LGP) having a first light incident surface and a first light source disposed beside the first light incident surface. The second backlight module is arranged at the second side. The second backlight module includes a second LGP having a second light incident surface and a second light source disposed beside the second light incident surface. The turning film is arranged at the first side. The turning film includes a plurality of reverse prisms. The reverse prisms extend along an extension direction. The first absorptive polarizer film is disposed between the first backlight module and the second backlight module. A display device is also provided.

Claims

1. A display device comprising:

a light source module comprising;

a first backlight module having a first side and a second side opposite to each other, the first backlight module comprising;

a first light guide plate having a first light incident surface; and

a first light source disposed beside the first light incident surface;

a second backlight module disposed at the second side of the first backlight module, the second backlight module comprising;

a second light guide plate having a second light incident surface; and

a second light source disposed beside the second light incident surface;

a first turning film disposed at the first side of the first backlight module, the first turning film comprising a plurality of reverse prisms extending along an extension direction;

a first absorptive polarizer film disposed between the first backlight module and the second backlight module, the first absorptive polarizer film having a first polarizing transmission axis; and

one or more second absorptive polarizer films located between the first absorptive polarizer film and the second backlight module, each of the second absorptive polarizer films has a fourth polarizing transmission axis, wherein an axial direction of the fourth polarizing transmission axis of the second absorptive polarizer film is different from an axial direction of the first polarizing transmission axis of the first absorptive polarizer film; and

a display panel located at one side of the light source module;

the display panel comprising;

a first polarizer film;

a second polarizer film having a second polarizing transmission axis; and

a liquid crystal layer disposed between the first polarizer film and the second polarizer film, wherein the second polarizer film is located between the liquid crystal layer and the first turning film of the light source module, and an included angle between an axial direction of the first polarizing transmission axis and an axial direction of the second polarizing transmission axis substantially falls within a range from 0 degree to 60 degrees.

2. The display device according to claim 1, wherein the included angle between the axial direction of the first polarizing transmission axis and the axial direction of the second polarizing transmission axis is substantially 0 degree, and the axial direction of the second polarizing transmission axis is substantially perpendicular to the extension direction of the reverse prisms.

3. The display device according to claim 1, wherein the included angle between the axial direction of the first polarizing transmission axis and the axial direction of the second polarizing transmission axis is substantially 0 degree, and the axial direction of the second polarizing transmission axis is substantially parallel to the extension direction of the reverse prisms.

4. The display device according to claim 1, wherein the light source module further comprises a reflective polarizer film disposed between the first absorptive polarizer film and the second backlight module, the reflective polarizer film has a third polarizing transmission axis, and an included angle between an axial direction of the third polarizing transmission axis and the axial direction of the first polarizing transmission axis is substantially greater than or equal to 0 degree and less than 90 degrees.

5. The display device according to claim 1, wherein the light source module further comprises a prism film and a diffuser film, the prism film and the diffuser film are located between the first absorptive polarizer film and the second backlight module, and the diffuser film is located between the prism film and the second backlight module.

6. The display device according to claim 1, wherein the light source module further comprises a second turning film and a diffuser film, the second turning film and the diffuser film are located between the first absorptive polarizer film and the second backlight module, and the second turning film is located between the diffuser film and the second backlight module.

7. The display device according to claim 1, wherein an included angle between an axial direction of the fourth polarizing transmission axes and the axial direction of the first polarizing transmission axis is substantially greater than or equal to 0 degree and less than 90 degrees.

8. The display device according to claim 7, wherein the light source module further comprises a reflective polarizer film disposed between the second absorptive polarizer films and the second backlight module, the reflective polarizer film has a third polarizing transmission axis, the axial direction of the first polarizing transmission axis of the first absorptive polarizer film is substantially parallel to the axial direction of the second polarizing transmission axis of the second polarizer film, and an axial direction of the third polarizing transmission axis of the reflective polarizer film is substantially parallel to the axial direction of the fourth polarizing transmission axes of the second absorptive polarizer film.

9. The display device according to claim 1, further comprising:

a control module; and

a power module coupled to the first light source of the first backlight module and the second light source of the second backlight module and configured to provide the first light source with a first driving current and the second light source with a second driving current, the control module being coupled to the power module and configured to control at least one of the first driving current and the second driving current.

10. A light source module comprising:

a first backlight module having a first side and a second side opposite to each other, the first backlight module comprising;

a first light guide plate having a first light incident surface; and

a first light source disposed beside the first light incident surface;

a second backlight module disposed at the second side of the first backlight module, the second backlight module comprising;

a second light guide plate having a second light incident surface; and

a second light source disposed beside the second light incident surface;

a first turning film disposed at the first side of the first backlight module, the first turning film comprising a plurality of reverse prisms extending along an extension direction;

a first absorptive polarizer film disposed between the first backlight module and the second backlight module, the first absorptive polarizer film having a first polarizing transmission axis; and

one or more second absorptive polarizer films located between the first absorptive polarizer film and the second backlight module, each of the second absorptive polarizer films has a fourth polarizing transmission axis, wherein an axial direction of the fourth polarizing transmission axis of the second absorptive polarizer film is different from an axial direction of the first polarizing transmission axis of the first absorptive polarizer film.

11. The light source module according to claim 10, wherein the light source module further comprises a reflective polarizer film disposed between the first absorptive polarizer film and the second backlight module, the reflective polarizer film has a third polarizing transmission axis, and an included angle between an axial direction of the third polarizing transmission axis and the axial direction of the first polarizing transmission axis is substantially greater than or equal to 0 degree and less than 90 degrees.

12. The light source module according to claim 10, wherein the light source module further comprises a prism film and a diffuser film, the prism film and the diffuser film are located between the first absorptive polarizer film and the second backlight module, and the diffuser film is located between the prism film and the second backlight module.

13. The light source module according to claim 10, wherein the light source module further comprises a second turning film and a diffuser film, the second turning film and the diffuser film are located between the first absorptive polarizer film and the second backlight module, and the second turning film is located between the diffuser film and the second backlight module.

14. The light source module according to claim 10, wherein an included angle between an axial direction of the fourth polarizing transmission axes and the axial direction of the first polarizing transmission axis is substantially greater than or equal to 0 degree and less than 90 degrees.

15. The light source module according to claim 14, wherein the light source module further comprises a reflective polarizer film located between the second absorptive polarizer films and the second backlight module, the reflective polarizer film has a third polarizing transmission axis, and an axial direction of the third polarizing transmission axis of the reflective polarizer film is substantially parallel to the axial direction of the fourth polarizing transmission axes of the second absorptive polarizer films.