TW202037986A - Light source assembly, backlight module, and display device - Google Patents

Abstract

The present disclosure provides a light source assembly, a backlight module, and a display device. The light source assembly includes a plurality of light emitting diode light sources and a light guide plate. A light emitting surface of each of the light emitting diode light sources includes a convex surface. The convex surface is used to emit backlight. A light incident surface of the light guide plate includes a plurality of concave surfaces. Each concave surface is corresponding to the convex surface of one of the light emitting diode light sources. The light emitting diode light sources are partially received in the concave surfaces of the light guide plate respectively, with the convex surface of each of the light emitting diode light sources attached to and engaged with one of the concave surfaces respectively. The light source assembly is in favor of increasing a light emitting angle of the light emitting diode light sources and shortening a light mixing distance between the light emitting diode light sources. The light source component is also in favor of enhancing the uniformity of the backlight emitted from the light emitting diode light sources and propagated in the light guide plate and realizing a narrow border of the display device.

Description

Light source assembly, backlight module and display device

The invention relates to the field of display technology, in particular to a light source assembly, a backlight module and a display device.

At present, most of the light sources of electronic products on the market need to be used with light guide plates. The optical performance design of the backlight module is very important, which requires higher assembly requirements for light emitting diodes (Light Emitting Diode, LED) and light guide plates. At present, the commonly used LED shape is a point light source or a surface light source, and the light-emitting surface of the LED is in contact with the surface of the light guide plate during assembly (zero-pitch assembly). Please refer to FIG. 1. In the conventional technology, the direct-down backlight module 100 includes a back plate 11, a plurality of light emitting diodes 12, and a light guide plate 13. The plurality of light emitting diodes 12 are arranged on the back plate 11 at intervals, and the light emitting surface of the light emitting diodes 12 is flat. (That is, the top-emitting type); the light guide plate 13 is arranged on the light emitting path of the light emitting diode 12, and the light incident surface of the light guide plate 13 is also flat. Please refer to Figure 2. The figure only shows the light-emitting area of two light-emitting diodes 12, which defines the minimum distance from the point where the light emitted from adjacent light-emitting diodes intersect to the light-emitting surface of the light-emitting diode as the light mixing distance. The light mixing distance of the two LEDs is I. Due to the relatively large light mixing distance I of the current flat panel products, it cannot meet the requirements of improved visual effects and narrow frame design trends to reduce light mixing distance. The large light mixing distance I is often accompanied by uneven brightness and darkness of the display screen. Phenomenon (Hot Spot).

The first aspect of the present invention provides a light source assembly, including: A plurality of light-emitting diode light sources, the light-emitting surface of each light-emitting diode light source includes a convex surface, and the light-emitting surface is used to emit a backlight; and A light guide plate whose light incident surface includes a plurality of concave surfaces corresponding to the convex surface of the light emitting surface of the light emitting diode light source, and the light emitting diode light sources are respectively embedded into the concave surface of the light guide plate so that the concave surface and the light emitting diode light source The convex surfaces fit together.

The second aspect of the present invention provides a backlight module including the above-mentioned light source assembly.

A third aspect of the present invention provides a display device, including: The aforementioned backlight module; and The display module, the backlight module is used to provide the display module with backlight required for image display.

The light-emitting surface of the light-emitting diode light source in the light source assembly, the backlight module and the display device provided by the present invention includes a convex surface, which is beneficial to increase the light divergence angle of the light-emitting diode light source, shorten the mixing distance between the light-emitting diode light sources, and the light guide plate The light incident surface corresponding to the part of the LED light source forms a plurality of concave surfaces so that the LED light source can be embedded, which is beneficial to further improve the uniformity of the backlight from the LED light source in the light guide plate, and is beneficial to the narrow frame design of the display device.

The light-emitting surface of the light-emitting diode light source in the light source assembly, the backlight module and the display device provided by the present invention includes a convex surface, which is beneficial to increase the light divergence angle of the light-emitting diode light source, shorten the mixing distance between the light-emitting diode light sources, and the light guide plate The light incident surface corresponding to the part of the LED light source forms a plurality of concave surfaces so that the LED light source can be embedded, which is beneficial to further improve the uniformity of the backlight emitted by the LED light source in the light guide plate, and is beneficial to the narrow frame design of the display device. The display device provided by the present invention can be a flat display product such as a mobile phone, a TV, and a computer. First embodiment

3, the first embodiment of the present invention provides a display device 10, the display device 10 includes a backlight module 200 and a display module 500, wherein the backlight module 200 is used to provide the display module 500 with the necessary image display Backlight.

In this embodiment, the display module 500 is a liquid crystal display module, which may include the mechanisms of a conventional liquid crystal display module, such as but not limited to including an active matrix substrate, an opposed color filter substrate, and an active matrix substrate. The liquid crystal layer and polarizer between the matrix substrate and the color filter substrate.

Further, the backlight module 200 in this embodiment is a direct type backlight module. The backlight module 200 includes a light source assembly 20 and a back plate 21. The light source assembly 20 includes a plurality of LED light sources 22 and a light guide plate 23. The light-emitting surface of the light-emitting diode light source 22 is used to emit a backlight, and the light guide plate 23 is used to diffuse the backlight emitted by the light-emitting diode light source 22 to make the backlight evenly distributed for display. The plurality of LED light sources 22 are arranged on the back plate 21 at intervals, the light guide plate 23 is stacked on the back plate 21, and the LED light sources 22 are located between the back plate 21 and the light guide plate 23.

In this embodiment, the light emitting diode light source 22 includes a light emitting diode chip 22n and a base 22m. The light emitting diode chip 22n is closer to the light guide plate 13 than the base 22m. The number and color of the light emitting diode light source 22 can be adjusted according to actual needs. There is no restriction on this.

Furthermore, referring to FIG. 4, the light-emitting surface 22 a of each LED light source 22 includes a convex surface 221 a, and the convex surface 221 a is a non-planar convex surface toward the light guide plate 23. The light-emitting surface 22a may be partially convex or all convex. In this embodiment, the light-emitting diode light source 22 is a top-emitting diode, and the entire light-emitting surface 22a is convex. The light guide plate 23 includes a light-incident surface 23a for receiving the backlight emitted by the LED light source 22. The light-incident surface 23a includes a plurality of concave surfaces 23b corresponding to the convex surfaces 221a of the light-emitting surface 22a of the LED light source 22, and the plurality of LED light sources 22 The concave surface 23b of the light guide plate 23 is respectively embedded so that the concave surface 23b and the convex surface 221a of the LED light source 22 are attached.

In this embodiment, the convex surface 221a of the LED light source 22 is a convex semi-cylindrical curved surface protruding toward the light guide plate 23. Please refer to the structure of the LED light source 22 shown in FIG. 6, except that the LED light source 22 shown in FIG. Light is incident from the side of the light guide plate 23. In this embodiment, the concave surface 23b of the light guide plate 23 is a concave semi-cylindrical curved surface that is recessed in the direction away from the LED light source 22. In other embodiments, the light-emitting surface 22a of the LED light source 22 also includes, for example, a convex triangular surface, a convex square surface, a convex trapezoidal surface, or a convex free-form surface. The specific shape can be designed according to actual needs, as long as the LED light source 22 is guaranteed After the light-emitting surface 22a is designed with a convex surface, the divergence angle of the output backlight can be increased. The shape of the concave surface 23b of the light guide plate 23 is designed to correspond to the light emitting surface 22a of the LED light source 22, so that the concave surface 23b of the light guide plate 23 and the convex surface 221a of the LED light source 22 can be inscribed and assembled.

Please refer to FIG. 5, at this time, the mixing distance of the two LED light sources 22 is I'. In this embodiment, the light-emitting surface 22a of the light-emitting diode light source 22 is set as a convex surface 221a, which is beneficial to increase the divergence angle of the backlight emitted by the light-emitting diode light source 22. The light mixing can be achieved by adjusting the curvature of the light-emitting surface of the light-emitting diode light source 22 The distance I'tends to zero, which is conducive to reducing the light mixing distance I', thereby increasing the illumination area of the backlight incident on the light incident surface 23a of the light guide plate 23, which is conducive to the uniformity of the backlight in the light guide plate 23, so that the display device 10 The uniformity of the display image is improved, which effectively improves the unevenness of light and darkness in the display image due to too small mixing distance.

In one embodiment, the light-emitting diode light source 22 includes an optical lens (not shown) and a light-emitting diode chip. The light-emitting diode chip is accommodated in an accommodation space formed by a recessed bottom surface of the optical lens. The top surface opposite to the bottom surface is the light emitting surface 22 a of the LED light source 22. In this embodiment, it is only necessary to adjust the shape of the light emitting surface 22a of the optical lens to match the concave surface 23b of the light guide plate 23.

Specifically, the light guide plate 23 may be made of acrylic resin, epoxy resin, polyurethane, transparent thermosetting resin, or ultraviolet curing resin. Through the existing process of injection molding, a plurality of concave surfaces 23b can be formed on the light incident surface 23a of the light guide plate 23.

In this embodiment, the light incident surface 23a of the light guide plate 23 corresponds to the part of the light emitting diode light source 22 to form a plurality of concave surfaces 23b, so that the light emitting diode light source 22 is embedded, which is beneficial to further improve the propagation of the backlight emitted by the light emitting diode light source 22 in the light guide plate. The uniformity also improves the light effect of the backlight emitted by the LED light source 22. Second embodiment

Please refer to FIG. 6, the main difference between the backlight module 300 and the backlight module 200 provided by the second embodiment of the present invention is:

The backlight module 300 is an edge-type backlight module and includes a light source assembly 20. In this embodiment, an optical glue is arranged between the convex surface 221 a of the LED light source 22 and the concave surface 23 b of the light guide plate 23, and the optical glue is used to fix the LED light source 22 on the light guide plate 23.

In this embodiment, the light source assembly 20 with the assembled light guide plate 23 and the LED light source 22 can be produced as an integrated product. In practical applications, only the light source assembly 20 needs to be directly connected to the backlight module 300 or display module. Other devices included in the group 500 can be assembled, which is beneficial to simplify the production process in practical applications and improve production efficiency.

The backlight module 300 may further include a reflective sheet (not shown in the figure), the reflective sheet is arranged on a side of the light guide plate 23 away from the light exit surface of the light guide plate 23 for emitting the light guide plate 23 away from the light exit surface of the light guide plate 23 The backlight is reflected back into the light guide plate 23 to improve the uniformity of the backlight distribution from the light guide plate 23.

In this embodiment, by reducing the light mixing distance I'between the LED light sources 22, it is advantageous to reduce the distance required for the LED light source 22 to irradiate the light incident surface 23a of the light guide plate 23 relatively uniformly, and to ensure the display screen As the uniformity is mentioned before, the frame of the display device including the backlight module 200 can be made narrower as the light mixing distance decreases.

The light-emitting surface 22a of the LED light source 22 provided by the present invention includes a convex surface 221a. If the light-emitting surface 22a of a light-emitting diode light source 22 is flat, the light-emitting surface 22a is designed to include the convex surface 221a without changing the material of the light-emitting surface 22a. The shape is beneficial to increase the light divergence angle of the LED light source 22 and shorten the light mixing distance between the LED light sources 22.

10: Display device 100, 200, 300: backlight module 20: Light source assembly 11, 21: backplane 12: LED 22: LED light source 22a: luminous surface 221a: convex 22m: base 22n: LED chip 13, 23: light guide plate 23a: Glossy surface 23b: concave 500: display module I, I': mixing distance

FIG. 1 is a schematic diagram of the structure of a conventional display device.

Fig. 2 is a schematic diagram of light emission of a conventional light emitting diode.

3 is a schematic diagram of the structure of the display device provided by the first embodiment of the present invention.

4 is a schematic diagram of the structure of the backlight module provided by the first embodiment of the present invention.

FIG. 5 is a schematic diagram of the light emission of the LED light source provided by the first embodiment of the present invention.

6 is a schematic diagram of the structure of a backlight module provided by the second embodiment of the present invention.

200: Backlight module

21: Backplane

22: LED light source

22a: luminous surface

221a: convex

22m: base

22n: LED chip

23a: Glossy surface

23b: concave

Claims (9)

A light source assembly is improved in that it includes: A plurality of light-emitting diode light sources, the light-emitting surface of each light-emitting diode light source includes a convex surface, and the light-emitting surface is used to emit a backlight; and A light guide plate whose light incident surface includes a plurality of concave surfaces corresponding to the convex surface of the light emitting surface of the light emitting diode light source, and the light emitting diode light sources are respectively embedded into the concave surface of the light guide plate so that the concave surface and the light emitting diode light source The convex surfaces fit together. The light source assembly according to claim 1, wherein the convex surface of the light-emitting diode light source is a semi-cylindrical curved surface convex toward the light guide plate, and the concave surface of the light guide plate is concave toward the side away from the light-emitting diode light source The semi-cylindrical surface. The light source assembly according to claim 1, wherein the light emitting diode light source includes an optical lens and a light emitting diode, the light emitting diode is accommodated in an accommodation space formed by a recessed bottom surface of the optical lens, and the optical The top surface of the lens opposite to the bottom surface is the light emitting surface of the light emitting diode light source. The light source assembly according to claim 1, wherein an optical glue is arranged between the convex surface of the light emitting diode light source and the concave surface of the light guide plate, and the optical glue is used to fix the light emitting diode light source to the Light guide plate. The light source assembly according to claim 1, wherein the light guide plate is made of acrylic resin, epoxy resin, polyurethane, transparent thermosetting resin, or ultraviolet curing resin. A backlight module, which is improved in that the backlight module includes the light source assembly according to any one of claims 1-5. The backlight module according to claim 6, wherein the backlight module is an edge-type backlight module or a direct-type backlight module. The backlight module according to claim 6, wherein the backlight module further includes a back plate, a plurality of the light-emitting diode light sources are arranged on the back plate at intervals, and the light guide plate is laminated on the back plate. On the board. A display device is improved in that it includes: The backlight module according to any one of claims 6-8; and The display module, the backlight module is used to provide the display module with backlight required for image display.

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