Light guide plate and backlight module

Patent metadata

Field	Value
Publication number	US-2016341866-A1
Application number	US-201514761623-A
Country	US
Kind code	A1
Filing date	Jun 25, 2015
Priority date	May 20, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

The present invention provides a light guide plate and a backlight module. The light guide plate has a light incident surface that has an arc configuration. The light guide plate includes an upper surface and a lower surface that have sides that are adjacent to the light incident surface and are respectively provided with a first slope surface and the second slope surface, so that large angle light, after being subject to an effect of convergence with the arc light incident surface, is subjected to total internal reflection at the first slope surface and the second slope surface to have the light guided into the light guide plate. The light guided into the light guide plate, after transmission and reflection, projects out through a light exit surface thereby improving light utilization and increasing light coupling efficiency. Since the light guide plate having the above-described structure demonstrates an excellent effect of convergence for light of all angles, the light guide portion of the light guide plate can be structured thinner without deteriorating light coupling efficiency, thereby facilitating a design of thinning of a backlight module. The present invention provides a backlight module, which involves a light guide plate having the above-described unique structure, so that the backlight module has a reduced thickness and a bettered effect of light emission.

First claim

What is claimed is:

1 . A light guide plate, comprising a first end surface, a second end surface opposite to the first end surface, an upper surface connected to upper ends of the first end surface and the second end surface, and a lower surface connected to lower ends of the first end surface and the second end surface;
wherein the first end surface comprises an arc configuration bulging outwardly of the light guide plate; wherein the upper surface comprises three sections, which are respectively a first horizontal surface, a first slope surface, and a second horizontal surface, the first horizontal surface being connected to the first end surface, the first slope surface being connected, at an inclination, between the first horizontal surface and the second horizontal surface, the first horizontal surface and the first slope surface defining therebetween a first included angle, the first included angle being an obtuse angle; wherein the lower surface comprises three sections, which are respectively a third horizontal surface, a second slope surface, and a fourth horizontal surface, the third horizontal surface being connected to the first end surface, the second slope surface being connected, at an inclination, between the third horizontal surface and the fourth horizontal surface, the third horizontal surface and the second slope surface defining therebetween a second included angle, the second included angle being an obtuse angle; and wherein the first end surface serves as a light incident surface of the light guide plate and the second horizontal surface serves as a light exit surface of the light guide plate.

2 . The light guide plate as claimed in claim 1 , wherein the light guide plate comprises a light incident portion and a light guide portion, the light incident portion being of a horn-like configuration, the light guide portion being of a rectangular parallelepiped configuration.

3 . The light guide plate as claimed in claim 2 , wherein the light incident portion comprises two portions, which are respectively a portion between the first horizontal surface and the third horizontal surface and a portion between the first slope surface and the second slope surface.

4 . The light guide plate as claimed in claim 3 , wherein a thickness between the first horizontal surface and the third horizontal surface is constant in the entirety of the portion and a thickness between the first slope surface and the second slope surface gradually decreases in a direction from the first horizontal surface to the second horizontal surface.

5 . The light guide plate as claimed in claim 2 , wherein the light guide portion comprises a portion between the second horizontal surface and the fourth horizontal surface, a thickness between the second horizontal surface and the fourth horizontal surface being constant in the entirety of the portion.

6 . The light guide plate as claimed in claim 1 , wherein the first horizontal surface and the third horizontal surface correspond to each other and are of the same size; the first slope surface and the second slope surface correspond to each other and are of the same size; and the third horizontal surface and the fourth horizontal surface correspond to each other and are of the same size.

7 . The light guide plate as claimed in claim 1 , wherein the first included angle and the second included angle are of the same angle.

8 . The light guide plate as claimed in claim 1 , wherein the second slope surface is coated with black ink jet, white ink jet, or alternatively arranged black and white ink jets.

9 . A light guide plate, comprising a first end surface, a second end surface opposite to the first end surface, an upper surface connected to upper ends of the first end surface and the second end surface, and a lower surface connected to lower ends of the first end surface and the second end surface;
wherein the first end surface comprises an arc configuration bulging outwardly of the light guide plate; wherein the upper surface comprises three sections, which are respectively a first horizontal surface, a first slope surface, and a second horizontal surface, the first horizontal surface being connected to the first end surface, the first slope surface being connected, at an inclination, between the first horizontal surface and the second horizontal surface, the first horizontal surface and the first slope surface defining therebetween a first included angle, the first included angle being an obtuse angle; wherein the lower surface comprises three sections, which are respectively a third horizontal surface, a second slope surface, and a fourth horizontal surface, the third horizontal surface being connected to the first end surface, the second slope surface being connected, at an inclination, between the third horizontal surface and the fourth horizontal surface, the third horizontal surface and the second slope surface defining therebetween a second included angle, the second included angle being an obtuse angle; wherein the first end surface serves as a light incident surface of the light guide plate and the second horizontal surface serves as a light exit surface of the light guide plate; wherein the light guide plate comprises a light incident portion and a light guide portion, the light incident portion being of a horn-like configuration, the light guide portion being of a rectangular parallelepiped configuration; wherein the first horizontal surface and the third horizontal surface correspond to each other and are of the same size; the first slope surface and the second slope surface correspond to each other and are of the same size; and the third horizontal surface and the fourth horizontal surface correspond to each other and are of the same size; and wherein the first included angle and the second included angle are of the same angle.

10 . The light guide plate as claimed in claim 9 , wherein the light guide plate comprises a light incident portion and a light guide portion, the light incident portion being of a horn-like configuration, the light guide portion being of a rectangular parallelepiped configuration.

11 . The light guide plate as claimed in claim 10 , wherein a thickness between the first horizontal surface and the third horizontal surface is constant in the entirety of the portion and a thickness between the first slope surface and the second slope surface gradually decreases in a direction from the first horizontal surface to the second horizontal surface.

12 . The light guide plate as claimed in claim 9 , wherein the light guide portion comprises a portion between the second horizontal surface and the fourth horizontal surface, a thickness between the second horizontal surface and the fourth horizontal surface being constant in the entirety of the portion.

13 . The light guide plate as claimed in claim 9 , wherein the second slope surface is coated with black ink jet, white ink jet, or alternatively arranged black and white ink jets.

14 . A backlight module, comprising a backboard, a reflector plate arranged on a bottom plate of the backboard, a light guide plate according to the claim 1 arranged on the reflector plate, a light source arranged on a sidewall of the backboard to correspond to a first end surface of the light guide plate, an optic film assembly arranged on the light guide plate, and a mold frame arranged on the backboard.

15 . The backlight module as claimed in claim 14 , wherein the optic film assembly is arranged above a second horizontal surface of the light guide plate and the reflector plate is arranged below a fourth horizont

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Guo Wei
• Zeng Jie
• Zhou Gege

Classifications

• G02B6/002 Primary

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title

• G02B6/0088

  of the light guide or other optical sheets in the package · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0018

  Redirecting means on the surface of the light guide · CPC title

• G02F1/133607

  the light controlling member including light directing or refracting elements, e.g. prisms or lenses · CPC title