TW202020364A - Illuminating mechanism, backlight module, and display device - Google Patents

Abstract

An illuminating mechanism comprises a LED, a light guiding plate disposed on the LED, and a light modulating unit disposed on the light guiding plate. The light guide plate has an upper surface and a lower surface. The lower surface has a groove. The light guide plate covers the LED with the groove, and the LED does not contact with the light guide plate. The light modulating unit is disposed on the upper surface of the light guide plate and correspondingly located directly above the LED, wherein the light modulating unit comprises a light shielding component, and the light shielding component has at least one hole to enable the light emitting through the hole. The invention also provides a backlight module and a display device including the illuminating mechanism.

Description

Light emitting mechanism, backlight module and display device

The invention relates to an optical device, in particular to a light-emitting mechanism, a backlight module and its display device.

The backlight module of the conventional LCD is arranged on the back of the LCD panel to provide the display light source required by the LCD panel. The backlight module can be divided into "side-lit" and "direct-down" designs according to the position of the light source. The "direct-down" design of the backlight module gradually uses multiple light-emitting diodes as the light source to replace the traditional incandescent lamp Or fluorescent tubes. When the light-emitting diode is used as a light source, a diffusion plate or a light guide plate is usually set at a certain spread distance above and then placed under the liquid crystal panel to provide a uniform light source for the liquid crystal panel.

But in practice, the light intensity of the light-emitting diode will be the strongest in the direction of the positive viewing angle (that is, the normal direction of the light-emitting surface of the light-emitting diode), so the orthographic projection of the position where the light-emitting diode directly fits the light guide plate The area will still form a bright spot, resulting in uneven brightness of the surface of the surface light source.

Therefore, an object of the present invention is to provide a light-emitting mechanism capable of improving uniformity.

The light-emitting mechanism of the present invention includes a light-emitting diode, a light guide plate disposed on the light-emitting diode, and a dimming unit provided on the light guide plate. The light guide plate has an upper surface and a lower surface, the lower surface has a groove, the light guide plate covers the light emitting diode with the groove, and the light emitting diode does not contact the light guide plate. The dimming unit is disposed on the upper surface of the light guide plate, and is corresponding to the light emitting diode Directly above, wherein the dimming unit includes a light-shielding element, the light-shielding element has at least one through hole, so that the light of the light-emitting diode below can emit light upward through the through hole.

Another technical means of the present invention is that the shading element has a center located directly above the light-emitting diode, and a plurality of through holes arranged at intervals, wherein the through holes are arranged in a ring around the center.

Another technical means of the present invention is that the shading element has a center located directly above the light-emitting diode, wherein the through hole is located at the center position.

Another technical means of the present invention is that the dimming unit further includes a light-transmitting element disposed above the light-shielding element and covering the through-hole, and the light-transmitting efficiency of the light-transmitting element is greater than that of the light-shielding element Penetration efficiency.

Another technical means of the present invention is that microstructures are formed on the upper and lower surfaces of the light guide plate.

Another technical means of the present invention is that the microstructures are arranged concentrically with the light-emitting diode as the center, and the microstructures are sparsely distributed adjacent to the light-emitting diode and away from the light-emitting diode The polar bodies are densely distributed.

Another object of the present invention is to provide a backlight module including the above-mentioned light emitting mechanism.

The backlight module includes a plurality of light emitting diodes, a plurality of light guide plates not in contact with each other, a diffusion plate provided above the upper surface of the light guide plate, and a plurality of light guide plates respectively disposed between the light guide plate and the diffusion plate Dimming unit. Each light guide plate has an upper surface and a lower surface, the lower surface has a groove, the light guide plate covers the corresponding light-emitting diode with the groove, and the light-emitting diode is not The light guide plate is in contact. The dimming units are respectively located directly above the light-emitting diodes, wherein each dimming unit includes a shading element, the shading element has There is one less through hole, so that the light from the light emitting diode below can emit light upward through the through hole.

Another technical means of the present invention is that the backlight module further includes a circuit board, and a reflective sheet provided on the circuit board, the reflective sheet has a plurality of spaced through slots, the light emitting diode is The through slots are arranged on the circuit board in a matrix, and the light guide plate is arranged on the reflective sheet in a matrix.

Another technical means of the present invention is that the shading element has a center located directly above the light-emitting diode, and a plurality of through holes arranged at intervals, wherein the through holes are arranged in a ring around the center.

Another technical means of the present invention is that the shading element has a center located directly above the light-emitting diode, wherein the through hole is located at the center position.

Another technical means of the present invention is that each dimming unit further includes a light-transmitting element disposed above the light-shielding element and covering the through-hole, and the light-transmitting efficiency of the light-transmitting element is greater than that of the light-shielding element Light penetration efficiency.

Another technical means of the present invention is that microstructures are formed on the upper and lower surfaces of each light guide plate.

Another technical means of the present invention is that the microstructures are arranged concentrically with the light-emitting diode as the center, and the microstructures are sparsely distributed adjacent to the light-emitting diode and away from the light-emitting diode The polar bodies are densely distributed.

Another object of the present invention is to provide a display device including a backlight module as described above, and a display panel disposed on the backlight module.

The beneficial effect of the present invention is that, through the above structural design, the problem of uneven brightness of the surface light source can be effectively improved.

2‧‧‧ circuit board

3‧‧‧Reflective film

31‧‧‧Through slot

4‧‧‧ LED

5‧‧‧Light guide plate

51‧‧‧Upper surface

52‧‧‧Lower surface

521‧‧‧groove

53‧‧‧Microstructure

6‧‧‧Diffusion plate

7‧‧‧ dimming unit

71‧‧‧Shading element

711‧‧‧Through hole

72‧‧‧Transparent components

8‧‧‧Display panel

C‧‧‧ Center

FIG. 1 is a schematic side view illustrating a preferred embodiment of the backlight module of the present invention; FIG. 2 is a perspective view to assist in explaining FIG. 1. For convenience of explanation, a diffuser plate is not shown in the figure; FIG. 3 to 6 are schematic diagrams illustrating various aspects of a light-shielding element of a dimming unit in the preferred embodiment; and FIG. 7 is a schematic side view illustrating a preferred embodiment of the display device of the present invention.

Relevant patent application features and technical contents of the present invention will be clearly presented in the following detailed description of preferred embodiments in conjunction with reference drawings. Before making a detailed description, it should be noted that similar elements are represented by the same number.

Referring to FIGS. 1 and 2, a preferred embodiment of the backlight module of the present invention includes a circuit board 2, a reflective sheet 3 disposed on the circuit board 2, a plurality of light-emitting diodes 4 arranged in a matrix, A plurality of light guide plates 5 arranged in a matrix and not in contact with each other, a diffusion plate 6 provided above the light guide plate 5, and a plurality of light adjustment units 7 provided between the light guide plate 5 and the diffusion plate 6 respectively . The reflective sheet 3 has a plurality of through-holes 31 spaced apart, the light-emitting diodes 4 are arranged in a matrix on the circuit board 2 through the through-holes 31, and the light guide plate 5 is arranged in a matrix on the On the reflective sheet 3. In other embodiments, the light-emitting diodes 4 may not be arranged in a matrix, but may be arranged in a stripe manner in the form of a light bar, and the light guide plate 5 may also be arranged in a stripe shape in response.

Each light guide plate 5 has an upper surface 51 and a lower surface 52. The lower surface 52 has a groove 521. The light guide plate 5 covers the corresponding light emitting diode 4 with the groove 521. And the light-emitting diode 4 is not in contact with the light guide plate 5. The upper surface of each light guide plate 5 Microstructures 53 are formed on both the 51 and the lower surface 52, and the microstructures 53 are arranged concentrically with the light-emitting diode 4 as the center C, and the microstructures 53 are distributed adjacent to the light-emitting diode 4 It is relatively sparse, and the distribution away from the light-emitting diode 4 is relatively dense. It should be noted that the microstructure 53 located on the lower surface 52 is used to destroy the total reflection, and the microstructure 53 located on the upper surface 51 is used to control the light output effect. The combination of the two can make the light output effect more uniform. In addition, the distribution of the microstructures 53 near the light-emitting diode 4 is relatively sparse, and the distribution away from the light-emitting diode 4 is relatively dense, because the light near the light-emitting diode 4 is strong, and The light away from the position of the light emitting diode 4 is relatively weak. The foregoing design will help to adjust the light intensity, thereby achieving the goal of uniform light intensity across the entire surface.

Referring to FIG. 1, the dimming units 7 are respectively located directly above the light-emitting diodes 4, wherein each dimming unit 7 includes a light-shielding element 71, and a light-transmitting element disposed above the light-shielding element 71 The element 72, and the light transmission efficiency of the light-transmitting element 72 is greater than the light transmission efficiency of the light-shielding element 71. The light-shielding element 71 has at least one through hole 711, so that the light of the lower light-emitting diode 4 can be diffused upward from the through hole 711, and then passes through the light-transmitting element 72 to emit light.

As shown in FIG. 3, the light shielding element 71 may have a center C located directly above the light-emitting diode 4, and the through hole 711 is located at the center C. The light-shielding element 71 may also have a center C located directly above the light-emitting diode 4 as shown in FIGS. 4 to 6, and a plurality of through holes 711 arranged at intervals, and the through holes 711 surround the center C is arranged in a ring. By changing the size, number, and arrangement of the through holes 711, light can be adjusted.

Referring to FIG. 7, a display panel 8 is provided on the backlight module to become a display device. Since the present invention is in the form of a direct type backlight module, and the trend of thinning the overall structure, the distance between the display panel and the light-emitting diode 4 will be reduced, so it will be directly above the light-emitting diode 4 It has high energy density, which is easy to produce bright spots on the display panel. question. The light-emitting diode 4 of the present invention is a light-emitting diode 4 that emits light on five sides. Therefore, in the preferred embodiment, the dimming unit 7 is disposed above the light-emitting surface of each light-emitting diode 4 Directly above, the light emitted by the four light-emitting surfaces on the side of each light-emitting diode 4 will be directly emitted through the light guide plate 5 or reflected by the reflective sheet 3 below and then emitted through the light guide plate 5. The light emitted through the light-emitting surface above each light-emitting diode 4 is formed by using the through holes 711 of the shading element 71 to form a geometric pattern arrangement, so that part of the light can be emitted from a through hole 711 at the center C of FIG. 3 Or, the light is emitted from the plurality of through holes 711 around the center C in FIG. 4, and the through holes 711 in FIGS. 3 and 4 are the same size, thereby allowing the light emitting diode 4 to have a higher brightness directly above , With light emitting diode 4 with lower energy. In addition, part of the light can be emitted from the plurality of through holes 711 around the center C in FIGS. 5 and 6, and the through holes 711 in FIGS. 5 and 6 are smaller than the through holes 711 in FIGS. 3 and 4. The brightness of the light-emitting diode 4 is reduced directly above the light-emitting diode 4 with higher energy.

Therefore, different regions of the shading element 71 can have reflection or light absorption functions respectively, and then cooperate with the setting of the light-transmitting element 72 to adjust the energy distribution above the light-emitting diode 4 to achieve uniform light output and improve the appearance . In addition, there is a gap between the light guide plates 5 without contacting each other, so the light between the adjacent light guide plates 5 does not help each other, and can be directly adjusted for the light in a specific area.

In summary, according to the present invention, the dimming unit 7 is provided directly above the light-emitting surface of each light-emitting diode 4 and cooperates with the light guide plate 5 to be separated from each other without contact, and the Both the upper surface 51 and the lower surface 52 of the light guide plate 5 are provided with the design of microstructures 53, which are simultaneously carried out by various means to achieve the best light adjustment effect, effectively improving the problem of uneven brightness of the surface light source, so it is indeed possible to achieve cost invention Purpose.

However, the above are only the preferred embodiments of the present invention, but the scope of implementation of the present invention cannot be limited by this, that is, generally according to the present invention The simple equivalent changes and modifications made in the scope of the patent application and the description of the invention still fall within the scope of the invention patent.

2‧‧‧ circuit board

3‧‧‧Reflective film

31‧‧‧Through slot

4‧‧‧ LED

5‧‧‧Light guide plate

51‧‧‧Upper surface

52‧‧‧Lower surface

521‧‧‧groove

53‧‧‧Microstructure

6‧‧‧Diffusion plate

7‧‧‧ dimming unit

71‧‧‧Shading element

711‧‧‧Through hole

72‧‧‧Transparent components

Claims (14)

A light-emitting mechanism includes: a light-emitting diode; a light guide plate having an upper surface and a lower surface, the lower surface has a groove, the light guide plate covers the light-emitting diode with the groove, and The light-emitting diode is not in contact with the light guide plate; and a light-adjusting unit is provided on the upper surface of the light guide plate and correspondingly located directly above the light-emitting diode, wherein the light-adjusting unit includes a light-shielding element, The shading element has at least one through hole, so that the light of the light emitting diode below can emit light upward through the through hole. The light-emitting mechanism according to item 1 of the patent application scope, wherein the light-shielding element has a center directly above the light-emitting diode, and a plurality of through-holes arranged at intervals, wherein the through-hole surrounds the center Arranged in a ring. The light-emitting mechanism according to item 1 of the patent application scope, wherein the light-shielding element has a center located directly above the light-emitting diode, and wherein the through hole is located at the center position. The light-emitting mechanism according to item 1 of the patent application scope, wherein the dimming unit further includes a light-transmitting element disposed above the light-shielding element and covering the through-hole, and the light-transmitting efficiency of the light-transmitting element is greater than The light penetration efficiency of the shading element. The light-emitting mechanism according to item 1 of the patent application scope, wherein the upper surface and the lower surface of the light guide plate are formed with microstructures. The light-emitting mechanism according to item 5 of the patent application scope, wherein the microstructure is arranged concentrically with the light-emitting diode as the center, and the microstructure is The distribution near the light emitting diode is relatively sparse, while the distribution away from the light emitting diode is relatively dense. A backlight module includes: a plurality of light-emitting diodes; a plurality of light guide plates, not in contact with each other, wherein each light guide plate has an upper surface and a lower surface, the lower surface has a groove, the light guide plate is based on The groove covers the corresponding light-emitting diode, and the light-emitting diode is not in contact with the light guide plate; a diffusion plate is located above the upper surface of the light guide plate; and a plurality of dimming units are respectively provided in Between the light guide plate and the diffuser plate, and correspondingly located directly above the light-emitting diode, wherein each dimming unit includes a light-shielding element, the light-shielding element has at least one through hole to make the light-emitting diode below The light of the polar body can exit upward through the through hole. The backlight module according to item 7 of the patent application scope further includes a circuit board and a reflective sheet provided on the circuit board, the reflective sheet has a plurality of spaced through slots, the light emitting diode is passed The through slots are arranged on the circuit board in a matrix, and the light guide plate is arranged on the reflective sheet in a matrix. The backlight module according to item 7 of the patent application range, wherein the light-shielding element has a center directly above the light-emitting diode, and a plurality of through holes arranged at intervals, wherein the through holes surround the center Arranged in a ring. The backlight module according to item 7 of the patent application scope, wherein the shading element has a center located directly above the light-emitting diode, and wherein the through hole is located at the center position. The backlight module according to item 7 of the patent application scope, wherein each dimming unit further includes a light-transmitting element disposed above the light-shielding element and covering the through-hole, and the light-transmitting efficiency of the light-transmitting element It is greater than the light penetration efficiency of the shading element. According to the backlight module described in Item 7 of the patent application scope, wherein the microstructure is formed on the upper surface and the lower surface of each light guide plate. The backlight module according to item 12 of the patent application scope, wherein the microstructures are arranged concentrically with the light-emitting diode as the center, and the microstructures are relatively sparsely distributed adjacent to the light-emitting diode , And the distribution away from the light emitting diode is dense. A display device includes a backlight module as described in any one of claims 7 to 13 and a display panel provided on the backlight module.

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