TWM445193U - Backlight module - Google Patents

Abstract

A backlight module includes a light guide plate, a first light source, and a second light source. The light guide plate has a light incident surface, a first side surface, and a second side surface opposite the first side surface. The first light source is disposed on one side of the light incident surface, and light beams emitted by the first light source enter the light guide plate via the light incident surface. The second light source is disposed on one side of at least one of the first side surface and the second side surface and near the light incident surface, and light beams emitted by the second light source enter the light guide plate via at least one of the first side surface and the second side surface.

Description

Backlight module

This creation relates to a backlight module.

FIG. 1 is a schematic diagram of a conventional backlight module. As shown in FIG. 1 , since the light-emitting diode 102 of the backlight module 100 generally has an illumination angle of about 20 degrees, the front end of the light guide plate 104 is likely to generate a dark region 106 to reduce luminance uniformity. Although increasing the number of the light-emitting diodes 102 or increasing the light-mixing distance can reduce the influence of the dark region 106 on the luminance uniformity, increasing the number of the light-emitting diodes 102 leads to higher manufacturing costs, and increasing the light-mixing distance is likely to cause Oversized screen border. As shown in FIG. 2, in another conventional design, the LEDs 202 of the backlight module 200 are disposed at the corners of the light guide plate 204 to avoid dark areas. However, when the light-emitting diodes 202 are disposed at the corners of the light guide plate 204, the heat is easily accumulated in the corners and is not easily dissipated, thereby reducing the service life of the light-emitting diodes 202. If the brightness is not enough, a plurality of light-emitting lights are disposed in each corner. In the case of the pole body 202, the corner frame needs to be correspondingly enlarged to meet the requirement of the narrow frame, and the gap between the light-emitting diode 202 and the light guide plate 204 in the corner is difficult to control during assembly.

Taiwan Patent Publication No. I318319 discloses a light guide plate having two light incident surfaces, and a cold cathode light tube is disposed outside each light incident surface. Taiwan Patent Publication No. M287446 discloses a backlight module in which a single light source is disposed on one side of a light guide plate, and the strip light source is composed of a plurality of green, blue, and red light emitting diodes arranged at equal intervals, and at both ends The luminous intensity of the last light-emitting diode is 30%-70% of the average luminous intensity of other light-emitting diodes.

The present invention provides a backlight module with low manufacturing cost, low light mixing distance, and high luminance uniformity.

Other objects and advantages of the present work can be further understood from the technical features disclosed in the present disclosure. To achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a backlight module including a light guide plate, a first light source, and a second light source. The light guide plate includes a light incident surface and a first side surface and a second side surface disposed opposite to each other. The first side surface and the second side surface are respectively connected to the light surface and are at an angle with the light incident surface. The first light source is disposed on one side of the light incident surface, and the light emitted by the first light source enters the light guide plate via the light incident surface. The second light source is disposed on one side of at least one of the first side surface and the second side surface and adjacent to the light incident surface, and the light emitted by the second light source enters the light guide plate via at least one of the first side surface and the second side surface.

In one embodiment, the first light source includes at least one light emitting diode light strip, and the second light source includes at least one light emitting diode. The number of the light emitting diodes of the second light source is smaller than the number of the light emitting diodes of the light emitting diode strip of the first light source.

In one embodiment, each of the light emitting diodes of the light emitting diode strip has a wattage greater than 0.3W.

In an embodiment, the first light source and the second light source comprise the same kind of light emitting diodes.

In an embodiment, the first light source and the second light source comprise different kinds of light emitting diodes. The wattage of the light emitting diode of the second light source is smaller than the wattage of the light emitting diode of the first light source.

In an embodiment, the first light source and the second light source form at least one light emitting diode A light bar, wherein the light emitting diode light bar can be U-shaped or L-shaped.

In an embodiment, the angle between the light exit surface of the first light source and the light exit surface of the second light source is 70-110 degrees.

In one embodiment, the second light source includes a first light emitting diode disposed on one side of the first side and adjacent to the light incident surface, and a second disposed on a side of the second side and adjacent to the light incident surface. Light-emitting diode.

In summary, the backlight module of the embodiment of the present invention has at least one of the following advantages: According to the design of the above embodiment, the second light source disposed on the side of the light guide plate can increase the brightness of the dark area of the front end of the light guide plate adjacent to the light incident surface, thereby effectively reducing brightness contrast between the bright area and the dark area, and is easy to use the dot micro The structure adjusts for good brightness uniformity. Therefore, it is not necessary to increase the number of the light-emitting diodes of the first light source or increase the light-mixing distance to obtain good luminance uniformity, so that high manufacturing cost and an excessive screen frame are not caused. In addition, since the light-emitting diode of the first light source does not need to be disposed at a corner position of the light guide plate, heat accumulation is less generated and the gap between the light source and the light guide plate is easily controlled during assembly.

Other objects and advantages of the present work can be further understood from the technical features disclosed in the present disclosure. The above and other objects, features and advantages of the present invention will become more apparent and understood.

For the above and other technical content, features and effects of this creation, The detailed description of the embodiments with reference to the drawings will be clearly presented. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is used to illustrate that it is not intended to limit the creation.

FIG. 3 is a schematic diagram of a backlight module according to an embodiment of the present invention. As shown in FIG. 3 , the backlight module 10 includes a light guide plate 12 , a first light source 14 , and a second light source 16 . The light guide plate 12 includes a light incident surface 121 and a first side surface 122 and a second side surface 123. The first side surface 122 and the second side surface 123 are respectively connected to the light surface 121 and are at an angle with the light incident surface 121. The first light source 14 is disposed on one side of the light incident surface 121 , and the light I1 emitted from the first light source 14 enters the light guide plate 12 via the light incident surface 121 . The second light source 16 is disposed on one side of the first side 122 and the second side 123 and adjacent to the light incident surface 121 , and the light I2 emitted by the second light source 16 enters the light guide plate 12 via the first side surface 122 and the second side surface 123 . In this embodiment, the first light source 14 can include at least one light-emitting diode light strip M, and the light-emitting diode light strip M can include a plurality of light-emitting diodes 22 arranged in a row, so that the light guide plate 12 is adjacent to the light guide plate 12 The front end of the glossy surface 121 may produce high contrast bright areas and dark areas. The second light source 16 may include a light emitting diode 22 disposed on one side of the first side surface 122 adjacent to the light incident surface 121, and another light emitting surface disposed on one side of the second side surface 123 and adjacent to the light incident surface 121. The polar body 22 can illuminate the front end of the light guide plate 12 by the second light source 16 disposed on the side surfaces 122 and 123 of the light guide plate 12 and adjacent to the light incident surface 121, thereby effectively reducing the brightness contrast between the bright area and the dark area, and The brightness of the area is increased, so it is easy to adjust the brightness uniformity using the dot microstructure. Since the number of the light emitting diodes 22 of the second light source 16 is smaller than the number of the light emitting diodes 22 of the light emitting diode strips M of the first light source 14, the cost is not increased. Achieve the effect of increasing the uniformity of luminance.

In an embodiment, the first light source 14 can use the light emitting diode 22 with a wattage greater than 0.3 W, and the first light source 14 and the second light source 16 can use the same kind of light emitting diode 22 . Further, since the first light source 14 uses the light-emitting diode 22 with a wattage of more than 0.3 W, the number of used LEDs can be reduced, and the second light source 16 with a small number is used to reduce the bright and dark regions. Brightness contrast, thus reducing manufacturing costs and increasing luminance uniformity. In addition, in another embodiment, the first light source 14 and the second light source 16 can use different kinds of light emitting diodes 22, wherein the wattage of the light emitting diodes 22 of the second light source 16 is, for example, smaller than that of the first light source 14 The wattage of the LED, the use of a lower wattage of the LED can further reduce the cost, and still have the effect of reducing the brightness contrast of the bright and dark areas to achieve increased brightness uniformity.

In addition, the angle between the light-emitting surface of the first light source 14 and the light-emitting surface of the second light source 16 may be 70-110 degrees.

4 is a schematic diagram of a backlight module according to another embodiment of the present invention. As shown in FIG. 4 , the second light source 16 of the backlight module 30 can be disposed only on one side of the light guide plate 12 . For example, the second light source 16 can include only one light emitting diode 22 and is disposed on the first side surface 122 . On the left side and adjacent to the light incident surface 121, the effect of improving the brightness of the dark area can also be obtained. Furthermore, in the embodiment, the first light source 14 and the second light source 16 can form at least one light-emitting diode light strip N, wherein the light-emitting diode light strip N can be U-shaped or L-shaped, etc., without limitation.

In summary, the backlight module of the embodiment of the present invention has at least one of the following advantages: by the design of the above embodiment, the second light source disposed on the side of the light guide plate can increase the darkness of the front end of the light guide plate adjacent to the light incident surface. Zone brightness, so it can effectively drop Brightness contrast between low-light and dark areas, and easy to use dot micro-structure to adjust for good luminance uniformity. Therefore, it is not necessary to increase the number of the light-emitting diodes of the first light source or increase the light-mixing distance to obtain good luminance uniformity, so that high manufacturing cost and an excessive screen frame are not caused. In addition, since the light-emitting diode of the first light source does not need to be disposed at a corner position of the light guide plate, heat accumulation is less generated and the gap between the light source and the light guide plate is easily controlled during assembly.

However, the above descriptions are only preferred embodiments of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent changes and modifications made by the present invention in accordance with the scope of the novel application and the novel description, All remain within the scope of this new patent. In addition, any embodiment or application of the present invention is not required to achieve all of the objects or advantages or features disclosed in the present disclosure. In addition, the abstract sections and headings are only used to assist in the search for patent documents and are not intended to limit the scope of the invention. In addition, the terms "first", "second" and the like mentioned in the specification or the scope of the claims are only used to name the elements or distinguish different embodiments or ranges, and are not intended to limit the number of elements. Upper or lower limit.

10, 30‧‧‧ backlight module

12‧‧‧Light guide plate

121‧‧‧Light guide plate into the light surface

122, 123‧‧‧Light guide plate side

14‧‧‧First light source

16‧‧‧second light source

22‧‧‧Lighting diode

100‧‧‧Backlight module

102‧‧‧Lighting diode

104‧‧‧Light guide plate

106‧‧‧Dark area

200‧‧‧Backlight module

202‧‧‧Lighting diode

204‧‧‧Light guide plate

I1, I2‧‧‧ rays

M, N‧‧‧Lighting diode strip

FIG. 1 is a schematic diagram of a conventional backlight module.

2 is a schematic view of another conventional backlight module.

FIG. 3 is a schematic diagram of a backlight module according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a backlight module according to another embodiment of the present invention.

10‧‧‧Backlight module

12‧‧‧Light guide plate

121‧‧‧Light guide plate into the light surface

122, 123‧‧‧Light guide plate side

14‧‧‧First light source

16‧‧‧second light source

22‧‧‧Lighting diode

I1, I2‧‧‧ rays

M‧‧‧Lighting diode strip

Claims (10)

A backlight module includes: a light guide plate, comprising a light incident surface and a first side and a second side opposite to each other, wherein the first side surface and the second side surface are respectively connected to the light incident surface and the light entering the light The first light source is disposed on one side of the light incident surface, and the light emitted by the first light source enters the light guide plate through the light incident surface; and a second light source is disposed on the first side surface And one side of at least one of the second sides and adjacent to the light incident surface, the light emitted by the second light source enters the light guide plate through at least one of the first side surface and the second side surface. The backlight module of claim 1, wherein the first light source comprises at least one light emitting diode light strip, and the second light source comprises at least one light emitting diode. The backlight module of claim 2, wherein the number of the light emitting diodes of the second light source is smaller than the number of the light emitting diodes of the light emitting diode strip of the first light source. The backlight module of claim 2, wherein each of the light emitting diodes of the light emitting diode strip has a wattage greater than 0.3W. The backlight module of claim 2, wherein the first light source and the second light source comprise the same kind of light emitting diodes. The backlight module of claim 2, wherein the first light source and the second light source comprise different kinds of light emitting diodes. The backlight module of claim 6, wherein the second light source The wattage of the light emitting diode is smaller than the wattage of the light emitting diode of the first light source. The backlight module of claim 1, wherein the first light source and the second light source form at least one light emitting diode light strip, wherein the light emitting diode light strip is U-shaped or L-shaped. The backlight module of claim 1, wherein an angle between the light emitting surface of the first light source and the light emitting surface of the second light source is 70-110 degrees. The backlight module of claim 1, wherein the second light source comprises a first light emitting diode disposed on one side of the first side and adjacent to the light incident surface, and disposed on the second a second light emitting diode on one side of the side surface and adjacent to the light incident surface.