Light guide plate and backlight module with the same

A light guide plate includes an incident edge and a plurality of V-shaped grooves. The incident edge includes a tilted surface, a vertical surface, a top surface and a bottom surface. The top surface is configured in parallel with the bottom surface. The top surface joins with an end of the tilted surface. The bottom surface joins with the other end of the tilted surface. The plurality of V-shaped grooves extend in a predetermined direction and are configured on the tilted surface. When the light from a light source strikes on a tilted surface, on which V-shaped grooves make the light diffused, and the diffused light is in conformity on the incident edge, having no hot spot there.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a liquid crystal display (LCD) technology, more particularly, to a light guide plate (LGP) removing hot spot on a incident edge and a backlight module with the LGP.

2. Description of the Prior Art

The LCD device has such merits of thinness, lightness, power saving, and low radiation as to be applied in notebook computers, mobile phones, electronic dictionaries and other electronic display devices. As per the LCD technology having been developing, so changes the environment in which the electronic display devices are used. They are more often used outdoors. Demand on visual effects is rising, so a LCD device of greater lightness is expected.

Accordingly, it is needed to raise light utilization efficiency. Among all parts of the backlight module, the LGP plays a very significant role in raising light utilization efficiency. In current LGPs, however, Hot spot is a common phenomenon on the incident edge (or lighting bottom) on the LGP.

SUMMARY OF THE INVENTION

According to the present invention, a light guide plate (LGP) comprises an incident edge and a plurality of V-shaped grooves. The incident edge comprises a tilted surface, a vertical surface, a top surface and a bottom surface. The top surface is configured in parallel with the bottom surface. The top surface joins with an end of the tilted surface. The bottom surface joins with the other end of the tilted surface. The plurality of V-shaped grooves extend in a predetermined direction and are configured on the tilted surface.

Furthermore, a predetermined direction is parallel with the width direction of the LGP.

Furthermore, an angle between the tilted surface and the bottom surface is in a range between 10° and 80°.

Furthermore, an angle between a first side and a second side of the V-shaped groove is 90°.

Furthermore, a width direction of the second side of the V-shaped groove is in parallel with the width direction of the top surface or the LGP.

Furthermore, a plurality of concave circular grooves are configured on the bottom surface.

According to the present invention, a backlight module comprises a light guide plate (LGP) and a light source module configured correspondingly to an incident edge of the LGP. The light source module comprises a supporting frame and a light source. The supporting frame comprises a tilted face configured in parallel with a tilted surface. The light source is configured on the tilted face. The LGP comprises an incident edge and a plurality of V-shaped grooves. The incident edge comprises a tilted surface, a vertical surface, a top surface and a bottom surface. The top surface is configured in parallel with the bottom surface. The top surface joins with an end of the tilted surface. The bottom surface joins with the other end of the tilted surface. The plurality of V-shaped grooves extend in a predetermined direction and are configured on the tilted surface.

Furthermore, the supporting frame further comprises a top face and a vertical face, the top face is on the same plane as the top surface, the top face joins with an end of the tilted face, the vertical face is configured in parallel with the vertical surface, the vertical face joins with the other end of the tilted face.

Furthermore, the light source module further comprises a reflector configured on the vertical face.

Furthermore, the light source module further comprises a light-shielding unit, the light-shielding unit is configured at the connection of the top face and the tilted face, and the top of the light-shielding unit is on the same plane with the top face.

Furthermore, a predetermined direction is parallel with the width direction of the LGP.

Furthermore, an angle between the tilted surface and the bottom surface is in a range between 10° and 80°.

Furthermore, an angle between a first side and a second side of the V-shaped groove is 90°.

Furthermore, a width direction of the second side of the V-shaped groove is in parallel with the width direction of the top surface or the LGP.

Furthermore, a plurality of concave circular grooves are configured on the bottom surface.

The object of the present invention is to provide a LGP and a backlight module with the LDP. When the light from a light source strikes on a tilted surface, on which V-shaped grooves make the light diffused, and the diffused light is in conformity on the incident edge, having no hot spot there.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1depicts a schematic diagram of a LCD device according to a preferred embodiment of the present invention.

Referring toFIG. 1, the LCD device according to the embodiment comprises a liquid crystal panel200and a backlight module100corresponding to the liquid crystal panel200. The backlight module100provides a display light source to the liquid crystal panel200so as to make the liquid crystal panel200display images.

The liquid crystal panel200comprises a thin film transistor (TFT) array substrate210, a color filter (CF) substrate220facing the TFT array substrate, and a liquid crystal layer230between the TFT array substrate210and the CF substrate220. The liquid crystal layer230comprises liquid crystal molecules. Due to the specific structure of the liquid crystal panel200according to the embodiment being fundamentally the same as the liquid crystal panel according to the prior art, here comes no detailed description about it.

The following is detailed description of the specific structure of the backlight module100according to the embodiment of the present invention.

FIG. 2depicts a lateral view of the backlight module100according to the embodiment of the present invention.

Referring toFIG. 2, the backlight module100according to the embodiment comprises: a light guide plate (LGP)110, a light source module120, a plurality of V-shaped grooves130, a first brightness enhancement film (BEF)141, a second BEF142, a diffuser film150, and a reflector sheet160. To be noted, the backlight module100further comprises other necessary optical components.

In particular, the LGP110comprises an incident edge110a, which comprises a tilted surface111, a vertical surface112, a bottom surface113and a top surface114. The bottom surface113indicates the bottom surface of the LGP110, and the top surface114indicates the top surface of the LGP110. The top surface114is parallel with the bottom surface113. The top surface114joins with an end of the tilted surface110, the other end of the tilted surface110joins with an end of the vertical surface112, and the other end of the vertical surface112joins with the bottom surface113. The plurality of V-shaped groove130extending in predetermined direction is configured on the tilted surface111.

The light source module120is configured correspondingly near the incident edge110a. Specifically, the light source module120comprises a supporting frame121and a light source122. The supporting frame121comprises a tilted face1211, configured in parallel with the tilted surface111of the incident edge110a. The light source122is fixed on the tilted face1211. Preferably, the preferred light source122is a light emitting diode (LED).

When the light from the light source122strikes on the tilted surface111, where the V-shaped groove130makes the light diffused, and the diffused light is in conformity on the incident edge, thereby avoiding occurrence of hot spot on the incident edge110a.

The first BEF141, the second BEF142, and the diffuser film150are configured sequentially onto the top surface114of the LGP110. The first BEF141and the second BEF142, by conjoining the light emitted from the top surface114, enhancing the brightness of the light from the top surface114. The diffuser film150is configured to provide even plane light source for the liquid crystal panel200, by enhancing the upward brightness of the light heightened by the BEFs and making the same light more even and softened. The reflector sheet160, under the bottom surface113of the LGP110, is configured to raise light utilization efficiency of the LGP110by reflecting the light out of the bottom surface113of the LGP110back to the LGP110.

According to the preferred embodiment, the predetermined direction where the V-shaped groove130extends is parallel with the width direction of the LGP110. Moreover, the angle between the tilted surface111and the bottom surface113can be set between 10° and 80° according to the manufacture's need.

Moreover, the V-shaped groove130comprises a first side131and a second side132, joining on a predetermined angle. Preferably, the predetermined angle is 90°. According to the embodiment, the width direction of the second side132is in parallel with the width direction of the LGP110, that is, the first side131is perpendicular to the bottom surface113or the top surface114.

Because the bottom surface113of the incident edge110ais opposite to the tilted face111, the light from the light source122, passing through the tilted surface111, strikes directly on the bottom surface113of the incident edge110a, which makes it too bright on the bottom surface113of the incident edge110a. It is therefore needed to disseminate a plurality of mesh points1131over the bottom surface113of the incident edge110a, to reduce the brightness there. Preferably, the plurality of mesh points is concave circular groove.

Moreover, the supporting frame121comprises a top face1212and a vertical face1213, where the top face1212is on the same plane with the top surface114, the top face1212joins with an end of the tilted face1211, the vertical face1213is configured in parallel with and opposite to the vertical surface112and the vertical face1213joins with the other end of the tilted face1211.

To increase the light utilization efficiency by reflecting the light emitted from the vertical surface112back to the LGP110, the light source module120further comprises a reflector123. The reflector123is configured on the vertical face1213so as to correspond to the vertical surface112. According to the embodiment, the reflector123can be a reflector film made of aluminum or other suitable reflectors.

To prevent the light from the light source122from leaking upward, the light source module120further comprises a light-shielding unit124, wherein the light-shielding unit124is configured at the connection of the top face1212and the tilted face1211. The top of the light-shielding unit124is on the same plane with the top face1212. According to the embodiment, the light-shielding unit124can be a black shading tape with a triangular cross section, but not limited to it according to the present invention.