CN210294588U

CN210294588U - Novel light guide plate suitable for narrow frame backlight unit

Info

Publication number: CN210294588U
Application number: CN201921062233.9U
Authority: CN
Inventors: 李斌; 杨超; 潘道明; 丁光耀; 江飞; 王建君
Original assignee: NANJING CHINA ELECTRONICS PANDA LIGHTING CO Ltd
Current assignee: NANJING CHINA ELECTRONICS PANDA LIGHTING CO Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2020-04-10
Anticipated expiration: 2029-07-09

Abstract

The utility model discloses a novel light guide plate suitable for narrow frame backlight unit, it includes the light guide plate body, and this light guide plate body has one and is used for accepting the income light lateral wall of light source, and with should go into the adjacent two light-blocking lateral walls of light lateral wall, all is provided with coating layer on arbitrary light-blocking lateral wall, should go into the light lateral wall and the thickness direction that the light guide plate body was all followed to the lateral wall that is in the light. After the coating layers are arranged on the two opposite sides of the light guide plate body, light emitted by the light source enters the light guide plate body through the light inlet side wall, part of the light can be emitted into the coating layers on the two sides, and at least part of the light can return to the light guide plate body under the reflection action of the coating layers, so that the energy loss of the light source is reduced, and the energy utilization rate of the light source is improved. After the coating layer is arranged, the distance between the light guide plate and the rubber frame can be effectively reduced, so that the light emitting range is reduced, and the problem of bright lines is solved.

Description

Novel light guide plate suitable for narrow frame backlight unit

Technical Field

The utility model relates to a novel light guide plate suitable for narrow frame backlight unit is applied to the liquid crystal display trade.

Background

With the improvement of the technical level and the improvement of the requirements of the market on various products, narrow-frame products become a new development trend of the liquid crystal display industry. In order to realize narrow frame design of the module in the industry at present, the backlight module structure with a rubber frame not pressing a light guide plate becomes the mainstream design mode at present. However, the structural design of the backlight module with the non-pressure-bearing rubber frame and the light guide plate has two problems to be solved urgently, namely, the non-pressure-bearing rubber frame type narrow-frame backlight module has the structure that the rubber frame does not press the light guide plate, and light rays are easy to emit from the gap between the rubber frame and the light guide plate, so that the phenomenon of poor edge bright lines is caused; and secondly, light rays at the gap between the rubber frame and the light guide plate are not effectively conducted and utilized by the light guide plate, and the energy loss of a light source emitted by the LED is large.

SUMMERY OF THE UTILITY MODEL

For at least part solution or improve above-mentioned problem, the utility model provides a light guide plate should say the worn-out fur and can reduce the loss of light source energy effectively, and specific technical scheme is:

the utility model provides a novel light guide plate suitable for narrow frame backlight unit, its includes the light guide plate body, and this light guide plate body has one and is used for accepting the income light lateral wall of light source, and two adjacent light blocking lateral walls of lateral wall are gone into with this, all are provided with coating layer on arbitrary lateral wall that is in the light, should go into the light lateral wall and the lateral wall that is in the light all extends along the thickness direction of light guide plate body. Preferably, the light guide plate is rectangular, and the two light blocking side walls are perpendicular to the light incident side wall.

After the coating layers are arranged on the two opposite sides of the light guide plate body, light emitted by the light source enters the light guide plate body through the light inlet side wall, part of the light can be emitted into the coating layers on the two sides, and at least part of the light can return to the light guide plate body under the reflection action of the coating layers, so that the energy loss of the light source is reduced, and the energy utilization rate of the light source is improved.

In the narrow-frame backlight module, a non-pressure-bearing structure is arranged between the rubber frame and the light guide plate, and light rays at the edge of the light guide plate are easy to be emitted out from a gap between the rubber frame and the light guide plate, so that the problem of bright lines of the backlight module is solved. Adopt the utility model discloses afterwards, on the basis that improves light source energy utilization, owing to reduced the total amount that light jetted out the light guide plate, the reducible light jet volume from gluing between frame and the light guide plate from this. After the coating layer is arranged, the distance between the light guide plate and the rubber frame can be effectively reduced, so that the light emitting range is reduced, and the problem of bright lines is solved.

Further, to avoid assembly interference, the thickness of the coating layer is 0.2 to 0.3 mm.

To enhance the ability of the coating layer to reflect light, the coating layer is a coated reflective film. The light rays emitted to the coating layer are reflected into the light guide plate to the maximum extent by utilizing the stronger light reflecting capacity of the coating reflecting film, so that the loss of the light source capacity is reduced.

In order to facilitate the coating layer, the light blocking side wall of the light guide plate body is polished. After polishing treatment, the light blocking side wall of the light guide plate body is smoother, and coating operation is facilitated.

Further, when the light guide plate is installed in the back plate, a gap of 0.4-0.5mm is formed between the light guide plate and the rubber frame. In order to pack the light guide plate into the rubber frame smoothly, the size of the light guide plate is slightly smaller than the internal size of the rubber frame, so that the rubber frame is prevented from forming extra pressure on the light guide plate, the light guide plate is enabled to generate extra deformation, and the quality of the backlight module is influenced.

The utility model discloses to general narrow frame backlight unit structure in industry, carry out the coating through the relative both sides wall to the light guide plate body and handle, form coating layer to do benefit to in this coating layer reflects back the light guide plate with partial directive light guide plate outside light at least, reach the effect of improving bright line problem and improving the whole optics of backlight unit.

Drawings

Fig. 1 is a diagrammatic view of an embodiment of the present invention.

Fig. 2 is a schematic view of the present invention in light guiding.

Fig. 3 is a schematic view of the backlight module with the present invention installed.

Fig. 4 is an enlarged view taken along line a-a in fig. 3.

Detailed Description

Referring to fig. 1, fig. 3 and fig. 4, a novel light guide plate 100 suitable for a narrow-frame backlight module includes a light guide plate body 10, where the light guide plate body 10 has a light incident side wall 13 for receiving a light source, and two side walls adjacent to the light incident side wall 13 form a first light blocking side wall 11 and a second light blocking side wall 12, that is, two light blocking side walls adjacent to the light incident side wall. A first coating layer 101 is disposed on the first light-blocking sidewall 11, and a second coating layer 102 is disposed on the second light-blocking sidewall 12, i.e., a coating layer is disposed on any one of the light-blocking sidewalls. The light incident side wall 11, the first light blocking side wall 12 and the second light blocking side wall 13 all extend along the thickness direction of the light guide plate body. In fig. 1, a direction perpendicular to the paper surface is a thickness direction of the light guide plate body.

In the present embodiment, the thickness of the first coating layer 101 is 0.2mm, and the thickness of the second coating layer 102 is 0.2 mm. In this embodiment, the first coating layer 101 and the second coating layer 102 have the same thickness, and it is understood that in other embodiments, the thicknesses of the first coating layer 101 and the second coating layer 102 may be different, for example, the thickness of the first coating layer 101 is 0.3mm, and the thickness of the second coating layer 102 is 0.25 mm. Referring to fig. 3 and 4, under the limitation of the thickness range, an adaptive distance S between the light guide plate 100 and the bezel 40 can be ensured to facilitate the installation of the bezel 40.

The light guide plate body 10 is rectangular, so that the first light blocking sidewall 11 and the second light blocking sidewall 12 are parallel and perpendicular to the light incident sidewall 13. Thus, the light guide plate 100 is rectangular, and the four side walls of the light guide plate body are polished after being cut.

In order to improve the utilization rate of light, in the present embodiment, the coating layer including the first coating layer 101 and the second coating layer is a coating reflective film.

Referring to fig. 2, when the light guide plate 100 of the present embodiment is used as a component of a backlight module, a light source 20 made of LED particles is disposed on one side of a light incident sidewall, and in the drawing, reference numeral 201 denotes light emitted by the light source 20. The first coating layer 101 and the second coating layer 102 partially reflect the light 201 emitted to the first coating layer and the second coating layer into the light guide plate body 10, thereby improving the utilization efficiency of the light source.

Referring to fig. 3 and 4, when the light guide plate 100 is installed in the back plate, the gap H between the light guide plate 100 and the rubber frame 30 is 0.4 mm. In other embodiments, the gap H may also be 0.45mm or 0.5 mm.

Claims

1. The utility model provides a novel light guide plate suitable for narrow frame backlight unit, its characterized in that, includes the light guide plate body, and this light guide plate body has a income light lateral wall that is used for accepting the light source, and with should go into the adjacent two light-blocking lateral walls of light lateral wall, all be provided with the coating layer on arbitrary light-blocking lateral wall, should go into the light lateral wall and the light-blocking lateral wall all extends along the thickness direction of light guide plate body.

2. The light guide plate of claim 1, wherein the thickness of the coating layer is 0.2-0.3 mm.

3. The novel light guide plate for a narrow-bezel backlight module as claimed in claim 1, wherein the light guide plate is rectangular.

4. The light guide plate as claimed in claim 1, wherein the coating layer is a reflective coating.

5. The light guide plate of claim 1, wherein the light blocking sidewalls of the light guide plate body are polished.

6. The light guide plate of claim 1, wherein the light guide plate has a gap of 0.4-0.5mm with the plastic frame when the light guide plate is installed in the back plate.