TW202024694A - Back-light module - Google Patents

Abstract

A backlight module includes a light guide plate, a plurality of single-surface light-transmitting light sources, and a plurality of multi-surface light-transmitting light sources. The package LED is located on the light-incident side of the light guide plate. The multi-surface light-transmitting light source is located on the light incident side of the light guide and each of the multi-surface light-transmitting light source is located between the two single-surface light-transmitting light sources. By disposing each the multi-surface light-transmitting light source between two of the single-surface light-transmitting light sources, The interference problem of the point light source due to the limitation of the microstructure size or the poor precision of the conventional LED arrangement can be overcome. Thus, the backlight module can be applied to the display device with slim non-display area, and provides good visual effects.

Description

Backlight module

The invention relates to the field of display, in particular to a backlight module.

Due to the brighter luminosity of the LED and the smaller overall volume, it is of great help to the thinning of 3C products. However, the LED is a point-shaped light source. In order to make the light diverge uniformly, it is necessary to arrange microstructures on the surface of the light guide plate corresponding to the LED, such as a corner column structure or a rhombus mirror structure, to uniformly diverge the light source. To achieve the effect of surface light source.

With the design of the display, it is hoped to make full use of the utilization rate of the panel to increase the proportion of the display area. At this time, the non-display area around the display area, such as the frame, must be reduced in area. Therefore, in the design, the backlight Modules must be thinner. However, the manufacturing process of the microstructure faces the limit of size, and the distance between the light guide plate and the light source must be at least greater than 4mm. In addition, if the microstructure is omitted and replaced with another structure capable of scattering, the problem of light interference fringes (mura) is likely to occur, which greatly affects the visual effect and is difficult to meet the shipping standard.

In addition, in order to reduce the influence of the microstructure, there is a way to solve the problem of light interference by applying the design of two LEDs side by side in the prior art. However, it is necessary to arrange the point light sources in a straight line to present the effect of a line light source, and then achieve the effect of a surface light source through the light guide plate. However, when LEDs need to cooperate with the printing technology to connect with the drive circuit, install the LED die, and electrically connect with the circuit board, the position of the LED is prone to deviation. Due to the limitation of the printing accuracy, the actual effect is It was not up to expectations.

In view of this, a backlight module is provided here. The backlight module includes a light guide plate, a plurality of single-sided light emitting lamp sources, and a plurality of multi-sided light emitting lamp sources. The single-side light emitting lamp source is located on the light incident side of the light guide plate. The multi-side light emitting lamp source is located on the light incident side of the light guide plate, and the multi-side light emitting lamp source is located between two single-side light emitting lamp sources.

In some embodiments, the size of the multi-side light emitting lamp source is smaller than the single-side light emitting lamp source.

In some embodiments, the backlight module further includes a flexible circuit board, and the single-sided light emitting lamp source and the multi-sided light emitting lamp source are arranged on the same surface of the flexible circuit board.

In some embodiments, the light incident side of the light guide plate includes a light incident surface and a plurality of extended light guide blocks, the extended light guide plate extends from the light incident surface, and the extended light guide blocks respectively correspond to multi-sided light emitting lamp sources.

In some embodiments, the extended light guide block includes a bottom surface and an inclined surface, the bottom surface is substantially perpendicular to the light incident surface, and the bottom surface faces the main light emitting surface of the multi-sided light emitting lamp source, and the inclined surface extends obliquely from the light incident surface to the bottom surface. Furthermore, in some embodiments, the backlight module further includes a reflective sheet, which is in contact with the light guide plate and the single-sided light source. And the flexible circuit board and the reflective sheet are located on the opposite surfaces of the light guide plate and the single-sided light source. Furthermore, in some embodiments, the reflective sheet is further attached to the inclined surface. In some embodiments, the reflective sheet covers the base surface of the light guide plate, and the base surface corresponds to the light exit side of the light guide plate. In other embodiments, the reflective sheet is disposed on a part of the light-emitting side of the light guide plate, and shields the multi-sided light-emitting lamp source.

In some embodiments, one light-emitting surface of the single-sided light-emitting lamp source faces the light-incident surface, and the first normal direction of the light-emitting surface is substantially orthogonal to the second normal direction of the main light-emitting surface of each multi-sided light-emitting lamp source.

In some embodiments, the single-sided light emitting lamp source and the multi-sided light emitting lamp source are blue LEDs, and a quantum dot film is further provided on the light incident surface and the bottom surface respectively, and the single-sided light emitting lamp source and the multi-sided light emitting lamp source emit blue light excitation The plurality of quantum dots in the quantum dot film are white light.

In some embodiments, a plurality of light guiding microstructures are further provided on the light incident surface.

In some embodiments, the distance between the multi-sided light emitting lamp sources is 2.1 to 5.5 mm.

In summary, the above-mentioned embodiments mainly provide a multi-sided light source located between two single-sided light sources to overcome the limitation of the size of the microstructure used for astigmatism or the poor accuracy of traditional LED arrangement. It is impossible to overcome the problems caused by the design of thinning the non-display area of the display. Furthermore, it can be applied to the design of thinning the non-display area of the display, providing a good visual experience.

The detailed features and advantages of the present invention will be described in detail in the following embodiments, and the content is sufficient to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the scope of patent application and the drawings Anyone who is familiar with relevant skills can easily understand the purpose and advantages of the present invention.

In the drawings, the widths of some elements, regions, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element is referred to as being "on" or "connected" to another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, or portions, these elements, components, regions, and/or portions are not Should be limited by these terms. These terms are only used to distinguish one element, component, region, or section from another element, component, region, layer or section. Therefore, the “first element,” “component,” “region,” or “portion” discussed below may be referred to as a second element, component, region, or portion without departing from the teachings herein.

In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship between one element and another element, as shown in the figure. It should be understood that relative terms are intended to include different orientations of the device other than those shown in the figures. For example, if the device in one figure is turned over, elements described as being on the "lower" side of other elements will be oriented on the "upper" side of the other elements. Therefore, the exemplary term "lower" may include an orientation of "lower" and "upper", depending on the specific orientation of the drawing. Similarly, if the device in one figure is turned over, elements described as "below" other elements will be oriented "above" the other elements. Thus, the exemplary terms "below" or "below" can include an orientation of above and below.

FIG. 1 is a partial top view of the backlight module of the first embodiment. As shown in FIG. 1, the backlight module 1 of the first embodiment includes a light guide plate 10, a plurality of single-sided light emitting lamp sources 20, and a plurality of multi-sided light emitting lamp sources 30. The single-sided light emitting lamp source 20 is located on the light incident side 11 of the light guide plate 10. A plurality of multi-side light emitting lamp sources 30 are located on the light incident side 11 of the light guide plate 10, and each multi-side light emitting lamp source 30 is located between two single-side light emitting lamp sources 20. Here, the light source may be a light emitting diode (LED).

The size of the multi-side light emitting lamp source 30 is smaller than the single-side light emitting lamp source 20. For example, the diameter of the single-sided light source 20 is 1.5 to 4.2 mm, and the multi-sided light source 30 is smaller than or equal to 20% of the single-sided light source 20. In addition, the single-sided light emitting lamp source 20 and the multiple multi-sided light emitting lamp sources 30 may be arranged in a zigzag pattern, and the single-sided light emitting lamp source 20 and the multi-sided light emitting lamp source 30 are not on the same horizontal line. However, this is only an example, not limited to this.

In addition, referring to FIG. 1 again, here, the distance d between the multi-faceted light emitting lamp sources 30 is 2.1 to 5.5 mm. In more detail, the distance d is the distance from the center point of one multi-side light emitting lamp source 30 to the center point of the other multi-side light emitting lamp source 30.

In addition, as shown in FIG. 1, the backlight module further includes a flexible circuit board 40. The single-sided light emitting lamp source 20 and the multi-sided light emitting lamp source 30 are arranged on the same surface of the flexible circuit board 40, for example, the upper Surface or bottom surface. In addition, the single-side light emitting lamp source 20 and the multi-side light emitting lamp source 30 are further located on the same side of the light guide plate 10, that is, the light incident side 11. Generally speaking, the multi-side light emitting lamp source 30 is a point light source with diverging light emitting directions, and has multiple light emitting directions, and the multi-side light emitting lamp source 30 is located between the two single-side emitting lamp sources 20; therefore, the multi-side emitting lamp source 30 can pass through The light emitted in different directions achieves the effect of compensating the single-sided light emitting lamp source 20, so that the light emitted by the entire backlight module 1 presents the effect of a surface light source.

FIG. 2 is a partial top view of the backlight module of the second embodiment. Fig. 3A is a schematic cross-sectional view taken along the line A-A of Fig. 2. Fig. 3B is a schematic cross-sectional view taken along line B-B of Fig. 2. In FIG. 2, the reflecting sheet 50 covering the plurality of single-side light emitting lamp sources 20, the plurality of multi-side emitting lamp sources 30, and the flexible circuit board 40 is omitted to facilitate the description of the relative positional relationship. As shown in FIGS. 2, 3A and 3B, the backlight module 1 of the second embodiment includes a light guide plate 10, a plurality of single-sided light emitting lamp sources 20, a plurality of multi-sided light emitting lamp sources 30, and a flexible circuit board 40. The difference from the first embodiment is that the light incident side 11 of the light guide plate 10 has a light incident surface 111 and a plurality of extended light guide blocks 15. The extended light guide plate 15 extends from the light incident surface 111 and extends the light guide block 15 Corresponding to the multi-sided light emitting lamp source 30 respectively. Therefore, the extended light guide block 15 may be a square and has a bottom surface 151. As shown in FIG. 3B, there is a gap between the bottom surface 151 and the flexible circuit board 40, and the multi-sided light emitting lamp source 30 is located in the gap. The bottom surface 151 corresponds to the main light emitting surface 305 of the multi-sided light emitting lamp source 30. The light from the main light exit surface 305 enters the bottom surface 151, and then the extended light guide block 15 can enter the light guide plate 10 and be directed in a specific direction.

Generally speaking, the height of the multi-side light emitting lamp source 30 is also lower than that of the single-side light emitting lamp source 20, and the multi-side light emitting lamp source 30 has a main light emitting surface 305 and the light emitting surface 205 of the single side light emitting lamp source 20 in different directions. Therefore, the extended light guide block 15 has a height compensation effect to maintain the distance between the main light exit surface 305 and the bottom surface 151 to be less than or equal to the distance between the light exit surface 205 and the light incident surface 111.

In addition, the single-sided light emitting lamp source 20 includes a light emitting source 21 and a package body 23. The package body 23 may be a reflective cover, which can reflect and converge the light emitted by the light emitting source 21 to emit light from the light emitting surface 205, and It is configured to guide all light into the light guide plate 10, and the light is directed to a specific direction, for example, the direction of the user's viewing angle. In addition, the multi-side light emitting lamp source 30 may be a chip scale package LED (CSP LED), which does not have a reflective cover. Therefore, the multi-side light emitting lamp source 30 has multiple light emitting directions. The main light emitting surface 305 has the strongest luminous intensity.

As shown in FIGS. 3A and 3B, it can be understood that the light-emitting surface of the single-sided light-emitting lamp source 20 faces 205 toward the light-incident surface 111, and the light-emitting surface 205 corresponds to the bottom surface 151. Therefore, the light-emitting surface of the single-sided light source 20 The first normal direction D1 of the surface 205 is substantially orthogonal to the second normal direction D2 of the main light-emitting surface 305 of the multi-surface light-emitting lamp source 30. In other words, in FIG. 2, the first normal direction D1 can be a direction from bottom to top, and the second normal direction D2 can be the direction of the paper exit surface, which is substantially orthogonal, which means that the two can be aligned with the normal direction. The intersection (90 degrees) is a slight angle difference, for example, plus or minus ten degrees.

3C is a schematic cross-sectional view of the third embodiment along the line B-B in FIG. 2. The third embodiment is different from the second embodiment in that the shape of the extended light guide block 15 and the structure on the A-A line are substantially the same, which will not be repeated here. As shown in FIG. 3C, in the third embodiment, the extended light guide block 15 includes a bottom surface 151 and an inclined surface 153. The bottom surface 151 is substantially perpendicular to the light incident surface 111 and faces the main light emitting surface 305 of the multi-surface light emitting lamp source 30. 153 extends diagonally from the light incident surface 111 to the bottom surface 151. Therefore, the light entering the extended light guide block 15 from the multi-faceted light emitting lamp source 30 will be reflected or refracted on the inclined surface 153 and directed toward the light incident surface 111.

Referring again to FIGS. 3A, 3B and 3C, in the second and third embodiments, the backlight module 1 further includes a reflective sheet 50, which is in contact with part of the light guide plate 10 and the single-sided light source 20 . Here, the surface of the light guide plate 10 facing the second normal direction D2 is defined as the light exit side 13. The flexible circuit board 40 and the reflective sheet 50 are located on two opposite surfaces of the single-sided light emitting lamp source 20. Furthermore, as shown in FIG. 3B, the reflective sheet 50 is located on a part of the light exit side 13 of the light guide plate 10, and a part of the light guide plate 10 is located on the flexible circuit board 40. The reflector 50 may be in a long strip shape, shielding the multi-side light emitting lamp source 30, and in the area corresponding to the multi-side light emitting lamp source 30, the bottom-up stacking basis is the flexible circuit board 40, the multi-side light emitting lamp source 30, the light guide plate 10 and Reflective sheet 50. Furthermore, the reflective sheet 50 is further attached to the side surface 155 of the extending light guide block 15. As shown in FIG. 3C, the extended light guide block 15 is further attached to the inclined surface 153 of the extended light guide block 15. The reflective sheet 50 can reflect light back into the light guide plate 10 and guide it in a specific direction, which can increase the intensity of the light. Furthermore, as shown at the bottom of FIG. 3A, FIG. 3B and FIG. 3C, in some embodiments, another reflective sheet 50 can be attached to the bottom of the light guide plate 10. In addition, the flexible circuit board 40 can be white to enhance the reflection effect.

4 is a partial top view of the backlight module of the fourth embodiment, and FIG. 5A is a schematic cross-sectional view of the fourth embodiment along the line A-A in FIG. 4. 5B is a schematic cross-sectional view of the fourth embodiment taken along the line B-B in FIG. 4. The fourth embodiment differs from the second embodiment and the third embodiment from the top view in that the flexible circuit board 40 can be seen. As shown in FIGS. 4, 5A, and 5B, the fourth embodiment is different from other embodiments in the positions of the flexible circuit board 40 and the reflective sheet 50. In the fourth embodiment, compared with the third embodiment, the directions of the flexible circuit board 40 and the reflective sheet 50 are inverted. In addition, the reflective sheet 50 covers the entire base surface 17 of the light guide plate 10 so as to emit the light source 20, The multi-side light emitting lamp source 30 and the ambient light all reflect toward the light emitting surface 205. As shown in FIG. 5A, the reflector 50 and the flexible circuit board 40 are arranged on the opposite surface of the single-sided light emitting lamp source 20. As shown in FIG. 5B, in the area corresponding to the multi-side light emitting lamp source 30, the bottom-up stacking basis is the reflector 50, the light guide plate 10, the multi-side light emitting lamp source 30, and the flexible circuit board 40. In addition, a part of the light guide plate 10 can be located on the flexible circuit board 40 and on the same side of the single-sided light emitting lamp source 20, and the reflective sheet 50 can be attached to the inclined surface 153 and part of the light guide plate 10.

6A is an enlarged schematic cross-sectional view of a partial cross-section along the line A-A in FIG. 2 of the fifth embodiment. 6B is an enlarged schematic cross-sectional view of a partial cross-section along the line B-B in FIG. 2 of the fifth embodiment. As shown in FIGS. 6A and 6B, the fifth embodiment adopts the configuration of FIGS. 3A and 3C, and only the technical difference on the left side is enlarged to show. The fifth embodiment is different from the previous embodiment in its single-sided light emitting lamp The source 20 and the multi-faceted light source 30 are blue LEDs. In addition, a quantum dot film 60 is further provided on the light incident surface 111 and the bottom surface 151, respectively. Generally, the single-sided light emitting lamp source 20 and the multi-sided light emitting lamp source 30 are white LEDs, and the fifth embodiment uses the blue light emitted by the single-sided light source 20 and the multi-sided light source 30 to excite plural numbers in the quantum dot film 60 Each quantum dot 61 is white light. The wavelengths of the colors are relatively continuous, and the display applied to the backlight module 1 of this type can have a higher color saturation. Here, the quantum dot 61 may be a quantum dot of yellow or orange phosphor. However, this is only an example, not a limitation.

Fig. 7 is an enlarged schematic partial cross-sectional view of the sixth embodiment taken along the line A-A in Fig. 2. As shown in FIG. 7, the sixth embodiment adopts the configuration of FIG. 3A, and only the technical difference on the left side is enlarged. The sixth embodiment is different from other embodiments in that the light guide plate 10 is on the light incident surface 111. A plurality of light guiding microstructures 70 are provided. The light guide microstructure 70 can be a rhombus lens. Through the effects of the light guide microstructure 70 and the multi-sided light source 30, the visual effect of the single-sided light source 20 point light source can be reduced. However, the sixth embodiment is an application guarantee Under the condition of the process accuracy of the light guide microstructure 70, for example, under the condition that the distance between the light guide plate 10 and the single-sided light source 20 is greater than or equal to 4 mm.

In summary, the backlight module 1 is mainly arranged between the two single-sided light-emitting lamp sources 20 by arranging the multi-sided light source 30 to overcome the size limit of the microstructure used for astigmatism or the traditional LED arrangement. The accuracy is poor, and the problem caused by the design of the non-display area thinning of the display cannot be overcome. Therefore, the backlight module 1 can be used in thinner displays to provide good visual effects.

Although the technical content of the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Anyone who is familiar with this technique and makes some changes and modifications without departing from the spirit of the present invention should be covered by the present invention Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

1: Backlight module 10: Light guide plate 11: Light side 111: light incident surface 13: Light emitting side 15: Extended light guide block 151: Bottom 153: Slope 155: side 17: Base surface 20: Single-sided light source 205: Glossy Surface 21: Luminous source 23: Package body 30: Multi-sided light source 305: Main Glossy Surface 40: flexible circuit board 50: reflective sheet 60: Quantum dot film 61: Quantum dots 70: light guide microstructure D1: First normal direction D2: Second normal direction d: spacing

FIG. 1 is a partial top view of the backlight module of the first embodiment. FIG. 2 is a partial top view of the backlight module of the second embodiment. Fig. 3A is a schematic cross-sectional view taken along the line A-A of Fig. 2. Fig. 3B is a schematic cross-sectional view taken along line B-B of Fig. 2. 3C is a schematic cross-sectional view of the third embodiment along the line B-B in FIG. 2. 4 is a partial top view of the backlight module of the fourth embodiment. Fig. 5A is a schematic cross-sectional view of the fourth embodiment taken along the line A-A in Fig. 4. 5B is a schematic cross-sectional view of the fourth embodiment taken along the line B-B in FIG. 4. 6A is an enlarged schematic cross-sectional view of a partial cross-section along the line A-A in FIG. 2 of the fifth embodiment. 6B is an enlarged schematic cross-sectional view of a partial cross-section along the line B-B in FIG. 2 of the fifth embodiment. FIG. 7 is an enlarged schematic cross-sectional view of a partial cross-section along the line A-A in FIG. 2 of the sixth embodiment.

1: Backlight module

10: Light guide plate

11: Light side

15: Extended light guide block

20: Single-sided light source

30: Multi-sided light source

40: flexible circuit board

Claims (13)

A backlight module includes: a light guide plate; a plurality of single-sided light emitting lamp sources located on a light incident side of the light guide plate; and a plurality of multi-sided light emitting lamp sources located on the light incident side of the light guide plate, and each The multi-side light emitting lamp source is located between the two single-side light emitting lamp sources. The backlight module according to claim 1, wherein the size of the multi-sided light source is smaller than the single-sided light source. The backlight module according to claim 1, further comprising a flexible circuit board, wherein the single-sided light-emitting lamp sources and the multi-sided light-emitting lamp sources are arranged on the same surface of the flexible circuit board. The backlight module according to claim 3, wherein the light incident side of the light guide plate includes a light incident surface and a plurality of extended light guide blocks, the extended light guide plates extend from the light incident surface, and the extensions The light guide blocks respectively correspond to the multi-sided light emitting lamp sources. The backlight module according to claim 4, wherein each of the extended light guide blocks includes a bottom surface and an inclined surface, the bottom surface being substantially perpendicular to the light incident surface and facing a main light emitting surface of the multi-sided light emitting lamp source, the The inclined surface extends obliquely from the light incident surface to the bottom surface. The backlight module according to claim 5, further comprising a reflective sheet, the reflective sheet is in contact with the light guide plate and the single-sided light source, and the flexible circuit board and the reflective sheet are located on the single-sided light source Opposite two surfaces. The backlight module according to claim 6, wherein the reflective sheet is further attached to the inclined surface. The backlight module according to any one of claim 6 or 7, wherein the reflective sheet covers a base surface of the light guide plate, and the base surface corresponds to a light exit side of the light guide plate. The backlight module according to any one of claim 6 or 7, wherein the reflective sheet is arranged on a part of a light-exit side of the light guide plate, and shields the multi-side light source. The backlight module according to claim 4, wherein a light-emitting surface of the single-sided light-emitting lamp sources faces the light-incident surface, a first normal direction of the light-emitting surface and the main light emission of each of the multi-sided light-emitting lamp sources A second normal direction of the surface is substantially orthogonal. The backlight module of claim 4, wherein the single-side light-emitting lamp sources and the multi-side light-emitting lamp sources are blue LEDs, and a quantum dot film is further provided on the light incident surface and the bottom surface, respectively, and The single-sided light emitting lamp source and the blue light emitted by the multi-sided light emitting lamp sources excite the plurality of quantum dots in the quantum dot film as white light. The backlight module according to claim 4, wherein a plurality of light guiding microstructures are further provided on the light incident surface. The backlight module according to claim 1, wherein the distance between the multi-sided light emitting lamp sources is 2.1 to 5.5 mm.

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