WO2014194636A1

WO2014194636A1 - Backlight module and display apparatus

Info

Publication number: WO2014194636A1
Application number: PCT/CN2013/089461
Authority: WO
Inventors: 龙君; 刘俊国; 宋勇
Original assignee: 北京京东方光电科技有限公司
Priority date: 2013-06-04
Filing date: 2013-12-14
Publication date: 2014-12-11
Also published as: CN103292219A

Abstract

A backlight module (1) and a display apparatus. The backlight module (1) comprises a first light guide plate (21) and a second light guide plate (22) which are stacked, and comprises a first light source (11) disposed opposite to the first light guide plate (21), and a second light source (12) disposed opposite to the second light guide plate (22). The first light source (11) and the second light source (12) are located on two opposite sides of the two light guide plates (21, 22). A microgroove structure (30) is disposed on either of upper surfaces of the first light guide plate (21) and the second light guide plate (22) or either of lower surfaces of the first light guide plate (21) and the second light guide plate (22), and as a distance between the microgroove structure (30) on each light guide plate (21, 22) and the light source (11, 12) opposite to the light guide plate (21, 22) increases, a height of the microgroove structure (30) increases. Therefore, a user can have three-dimensional feeling on a seen image without requiring optical gratings, thereby improving the display brightness.

Description

Backlight module and display device

Embodiments of the present invention relate to a backlight module and a display device. Background technique

In recent years, stereoscopic display, that is, 3D (three-dimens iona) display, has become a major trend in the display field. Compared with ordinary two-dimensional display, 3D technology can make the picture stereoscopic, and the image is no longer limited to the screen plane, as if it can walk out of the screen, giving the audience an immersive feeling. Although the classification of 3D display technology is numerous, the basic principle is similar, that is, different images are received by the human eye, because the eyes of the person are separated by about 65 mm, and the difference in position causes the left eye and the right eye to see different. The two-dimensional image, and then the brain is superimposed and regenerated by the information of different two-dimensional images to form an image with the effects of the front, the back, the left, the right, the far, and the like.

Today's mainstream 3D stereoscopic display technology is achieved through special glasses, which makes its application range and comfort of use greatly reduced. In order to solve the above problems, the eye 3D display technology has become a new hot spot of research. The conventional eye-eye 3D display device is composed of a display panel and a grating, wherein the grating comprises a plurality of grating units, and the grating is arranged in front of the display panel in a certain manner, and the grating is divided to make the eyes of the person see different Visual images that produce a three-dimensional look. However, due to the addition of a grating on the display, the display brightness is lowered. Summary of the invention

Embodiments of the present invention provide a backlight module and a display device, including the display device of the backlight module, which can make a stereoscopic feeling to a person who sees a picture without a grating, thereby improving display brightness.

Embodiments of the present invention adopt the following technical solutions:

The present invention provides a backlight module, including: a first light guide plate and a second light guide plate stacked in a stack; and a first light source disposed opposite to the first light guide plate and a second light source disposed opposite to the second light guide plate, Wherein the first light source and the second light source are located on opposite sides of the two light guide plates; wherein, on the upper surface of the first light guide plate and the second light guide plate or on the first light guide plate And The lower surface of the second light guide plate is provided with a microgroove structure, and the farther the microgroove structure on each of the light guide plates is from the opposite light source, the higher the height of the microgroove structure.

Optionally, the slot structure forms a plurality of rows on the light guide plate, and the farther the distance from the opposite light source is, the smaller the pitch of the adjacent two rows is.

Optionally, each row includes a plurality of microgroove structures, and the microgrooves in the same row are evenly distributed. Alternatively, the further away from the opposite source, the more microgrooves each row includes.

Optionally, the slot structure is a triangular groove.

Optionally, the microchannel structure is a right triangle groove.

Optionally, the inclined angles of the inclined sides of the right-angled triangular grooves on the light guide plate are the same.

Optionally, the inclined angle of the right-angled triangular groove is 40 degrees. -60° between. Optionally, the height of the light source is the same as the height of the light guide plate.

The embodiment of the present invention provides a display device, including: a backlight module and a display screen, wherein the backlight module is any backlight module provided by the embodiment of the present invention. DRAWINGS

The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, in which FIG.

1 is a cross-sectional structural view of a backlight module according to an embodiment of the present invention;

2 is a schematic diagram of an optical path of light emitted by a first light source according to an embodiment of the present invention; FIG. 3 is a schematic diagram of an optical path of light emitted by a second light source according to an embodiment of the present invention; FIG. 5 is a schematic structural view of a second light guide plate according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of another second light guide plate according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another second light guide plate according to an embodiment of the present invention. Reference mark:

1-backlight module; 2-frame; 30-microgroove structure; 30a-right angle side; 30b-inclined side; 31-first support member; 32-second support member; 4-reflecting plate; 6-diffusion sheet; 7-display; 8-transparent glue; 11-first light source; 12-second light source; 21_first light guide plate; 22_second light guide plate. detailed description The technical solutions of the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the exemplary embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described exemplary embodiments of the present invention without the need for inventive work are within the scope of the present invention.

Unless otherwise defined, technical terms or scientific terms used herein shall be of the ordinary meaning understood by those of ordinary skill in the art to which the invention pertains. The words "first", "second" and similar terms used in the specification and claims of the present invention are not intended to indicate any order, quantity or importance, but merely to distinguish different components. Similarly, the words "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. The words "including" or "comprising", and the like, are intended to mean that the elements or items that are present in the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; "Upper", "Bottom", "Left", "Right", etc. are only used to indicate the relative positional relationship. When the absolute position of the object to be described is changed, the relative positional relationship may also change accordingly.

The embodiment of the present invention provides a backlight module 1 including: a first light guide plate 21 and a second light guide plate 22 stacked in a stack; a first light source 11 and a second light guide plate 22 disposed opposite to the first light guide plate 21 a second light source 12 disposed oppositely, and the first light source 11 and the second light source 12 are located on opposite sides of the two light guide plates; wherein, the first light guide plate 21 and the second light guide plate The upper surface of the 22 or the lower surface of the first light guide plate 21 and the second light guide plate 22 are provided with a microgroove structure 30, and the distance between the microgroove structure 30 on each of the light guide plates and the opposite light source is Far, the height of the microgroove structure is higher.

It should be noted that, the first light guide plate and the second light guide plate are stacked, and the first light guide plate is located on the second light guide plate, or the second light guide plate is located on the first light guide plate. The positions of the first light guide plate and the second light guide plate are not limited thereto. For example, when the first light source is disposed opposite to the first light guide plate, the first light guide plate deflects the light emitted by the first light source in one direction, that is, the light emitted by the first light source is blocked by the left eye (or the right eye) of the person. Correspondingly, a second light source is disposed opposite to the second light guide plate, and the second light guide plate is configured to deflect the light emitted by the second light source in another direction, that is, the light emitted by the second light source is The right eye (or left eye) receives. It should be noted that, in the embodiment of the present invention, the first light guide plate deflects the light of the first light source to the right side, and the second light guide plate deflects the light emitted by the second light source to the left side, wherein the The left "right" is set along the optical path of the backlight module, bounded by the normal of the backlight module. First light guide The light deflected to the right by the plate is received by the left eye of the person, and the light deflected to the left by the second light guide plate is received by the right eye of the person, as shown in FIG.

As shown in Fig. 2, a first light source 11 is disposed opposite to the first light guide plate 21, and the first light guide plate 21 causes the light emitted from the first light source 11 to be deflected in the right direction. For example, as shown in Fig. 2, the light e and the light f emitted from the first light source 11 are deflected to the right by multiple reflections and refractions of the light guide plate, i.e., the light emitted by the first light source is received by the left eye of the person. Similarly, as shown in FIG. 3, a second light source 12 is disposed opposite to the second light guide plate 22, and the second light guide plate 22 is configured to deflect the light emitted by the second light source 12 to the left direction, as shown in FIG. As shown, the light ray a, the light ray c, and the light ray b emitted by the second light source 12 are deflected to the left side after being repeatedly reflected and refracted by the light guide plate, that is, the light emitted by the second light source 12 is received by the right eye of the person. Since the light emitted by the first light source and the second light source is deflected in two directions by the light guide plate and respectively received by the left eye and the right eye of the human eye, the left eye view and the right eye view will see different two-dimensional images. Then, the brain superimposes the information of different two-dimensional images to form a three-dimensional effect. In the embodiment of the present invention, the structures of the first light guide plate and the second light guide plate may be the same, but in order to ensure the deflection of the light corresponding to the light source of each light guide plate, according to the light source when the backlight module is mounted Position, the orientation of the two light guide plates is different when installed.

According to an embodiment of the invention, a microgroove structure is provided on an upper surface of the first light guide plate and the second light guide plate or on a lower surface of the first light guide plate and the second light guide plate. For example, a microgroove structure may be disposed on an upper surface of the first light guide plate and the second light guide plate, or may be a lower surface of the first light guide plate 21 and the second light guide plate 22 as shown in FIG. Set the microgroove structure. The farther the microgroove structure on each of the light guide plates is from the opposite light source, the higher the height of the microgroove structure, that is, the height of the microgroove structure along the optical path of the light source opposite thereto. As shown in FIG. 1, the farther the microgroove structure on the first light guide plate 21 is from the first light source 11, the higher the height of the microgroove structure; correspondingly, the microgroove structure on the second light guide plate 22 is away from the second light source 12 The further away, the higher the height of the microgroove structure. The greater the loss of light from the light source, the greater the loss of light from the light source, that is, the intensity of the light at the position closer to the light source on the light guide plate is greater, and the intensity of the light at a position farther from the light source is smaller, farther away from the light source. The higher the height of the microgrooved structure included in each row at the position, the more light from the source can be made to reach the position where the light guide plate is farther away. Moreover, the light is deflected by the microgroove structure at a position far from the light source, and the uniformity of light emitted through the light guide plate can be further improved. The light emitted by the light source is prevented from being emitted and refracted only at a position close to the light guide plate, the intensity of the light at a position far from the light source is small, and the backlight module emits unevenly. The microgroove structure is disposed on the lower surface of the light guide plate, and the height of the microgroove structure is the microgroove structure from the lower surface of the light guide plate The maximum distance; the microgroove structure is disposed on the upper surface of the light guide plate, and the height of the microgroove structure is the maximum distance of the microgroove structure from the surface of the light guide plate.

The embodiment of the present invention provides a backlight module, wherein the backlight module includes a first light guide plate and a second light guide plate stacked in a stack; a first light source disposed opposite to the first light guide plate and opposite to the second light guide plate a second light source, and the first light source and the second light source are located on opposite sides of the two light guide plates, wherein the first light guide plate deflects light emitted by the first light source in one direction, that is, Light emitted by a light source is received by a left eye (or right eye) of the person; correspondingly, a second light source is disposed opposite to the second light guide plate, and the second light guide plate is used to make the light emitted by the second light source One direction is deflected such that light emitted by the second source is received by the right eye (or left eye) of the person. Since the first left eye and the right eye are received, the left eye and the right eye will see different two-dimensional images, and then the information of different two-dimensional images is superimposed by the brain to form a three-dimensional effect without setting a grating. The farther the micro-slot structure of the first light guide plate and the second light guide plate is from the opposite light source, the higher the height of the micro-slot structure is, the light from the light source can be ensured to reach the position of the light guide plate far away from the light source. At the same time, the light is deflected by the microgroove structure to improve the uniformity of illumination of the backlight module.

Optionally, as shown in FIG. 4-7, the micro-slot structure forms a plurality of rows on the light guide plate, and the distance from the opposite light source is smaller, and the spacing between adjacent rows is smaller. It should be noted that, in this embodiment, only the second light guide plate is taken as an example for detailed description. The first light guide plate has the same arrangement as the micro groove structure on the second light guide plate, and the principle is the same. As shown in Fig. 4, the pitch p of the adjacent two rows of microgroove structures closer to the light source is greater than the pitch k of the adjacent two rows of microgroove structures farther from the source. As shown in Fig. 4, the microgroove structure is formed in a plurality of rows in the direction of 101. It should be noted that the 101 direction may be the optical path direction of the light source opposite to the light guide plate. As shown in FIG. 4, the 101 direction is the optical path direction of the second light source 12. Since the light guide plate is closer to the light source, the intensity of the light emitted by the light source is strong, and the distance from the light source is far, the intensity of the light is weak. Therefore, the embodiment of the present invention is designed such that: the farther the light guide plate is from the opposite light source, the adjacent two The smaller the pitch of the micro-groove structure of the row, the denser the distribution of the micro-groove structure at the position of the light guide plate at a distance from the light source, the utilization of light emitted by the light source can be improved, and the uniformity of illumination of the backlight module can be further improved.

It should be noted that the micro-groove structure on the light guide plate is formed in multiple rows, which may be as shown in FIG. 5, each row includes a micro-groove structure, and the one micro-groove structure runs through the entire light guide plate, so that Each row includes a plurality of micro-groove structures, and a plurality of micro-groove structures in the same row are evenly distributed to ensure The uniformity of light exiting after being reflected and refracted by the microgroove structure.

Further, as shown in Fig. 7, the further away from the opposite light source, the more microgrooves are included in each row. The greater the loss of light from the light source, the greater the loss of light from the light source, that is, the intensity of the light closer to the light source on the light guide plate is stronger, and the intensity of the light farther from the light source is weak. Therefore, the present embodiment is designed such that the distance is Each row in the vicinity of the light source includes fewer micro-grooves, so that the light emitted by the light source can reach the position where the light guide plate is farther away, and each row is included at a position farther from the light source. The micro-groove structure has many structures, so that the light at a position far away from the light source can be reflected and refracted by more micro-groove structures, thereby improving the uniformity of illumination of the backlight module.

Optionally, the slot structure is a triangular groove. For example, as shown in Figures 4-7, the slot structure is a right-angled triangular slot. As shown in Fig. 4, each of the right-angled triangular grooves includes a right-angled side 30a and a slanted side 30b. The length of the right-angled side perpendicular to the lower surface of the light guide plate is the depth or height of the groove. As shown in FIG. 4, the farther the right triangular groove on the second light guide plate 22 is from the second light source 12, the higher the height of the right angle side 30a. And the inclined side of the right triangle is opposite to the light source opposite to the light guide plate. As shown in Fig. 1, the inclined sides of the right-angled triangular grooves on the light guide plate 21 are opposed to the first light source 11; the inclined sides of the right-angled triangular grooves on the light guide plate 22 are opposed to the second light source 12.

Optionally, the inclined angles of the inclined sides of the right-angled triangular grooves on the light guide plate are the same. As shown in Fig. 4, the angle between each inclined side 30b of the light guide plate and the right angle side 30a is an inclination angle, and the inclination angles α on the light guide plate are the same. In this way, the light guide plate is not only easy to manufacture, but also easy to form and the light is emitted within a certain range, and the uniformity of light emitted by the light guide plate can be further ensured.

Optionally, the inclined angle of the right-angled triangular groove is 40 degrees. -60. between. It should be noted that the angle of inclination of the right triangle is, for example, 40°, 50° or 60°. This not only avoids total reflection, but also because the maximum angle at which the human left and right eyes receive light is typically 70°, and the minimum angle is typically 10° if the angle of inclination is designed to be 40. -60. Between the two, the angle of the light emitted by the light guide plate is 5° - 35 with respect to the direction perpendicular to the display device (i.e., perpendicular to the light guide plate). Between the two, the sum of the angles of the light emitted by the light guide plate deflected in two directions is 10. -70. Between, therefore, it is guaranteed that people receive light at an angle of 10° -70. Between, to ensure that the human eye receives images normally.

Optionally, the height of the light source is the same as the height of the light guide plate. This can increase the utilization of light emitted by the light source.

Optionally, the backlight module further includes: a frame and a support member, wherein the frame and the support member are used for fixing and supporting the light guide plate and the light source. For example, as shown in FIG. 1, the backlight module further includes a frame. The frame 2 and the first support member 31 and the second support member 32 are used to support the components of the entire backlight module, and the support member is used to support other components of the backlight module. As shown in FIG. 1, the first support member 31 supports the prism sheet 5, the diffusion sheet 6, and the display screen 7. The second support member 32 is for supporting the first light source 11. It should be noted that the components of the backlight module are not limited to the above description. As shown in FIG. 1 , the backlight module may further include a reflective sheet 4 . Other related components of the backlight module can be designed as in conventional technology.

In addition, as shown in FIG. 1, the first light guide plate 21 and the second light guide plate 22 can also be bonded together by the transparent glue 8 before assembly, thereby further facilitating the installation of the backlight module.

The embodiment of the present invention provides a display device, including: a backlight module and a display screen, wherein the backlight module is any backlight module provided by the embodiment of the present invention. The display device may be a display device such as a liquid crystal display or an electronic paper, and any product or component having a display function such as a television, a digital camera, a mobile phone, a tablet computer or the like including the display device.

When the display device is in operation, the two light sources of the backlight module are sequentially switched on and turned on. Referring to Fig. 3, when the second light source 12 is turned on, the light emitted from the second light source 12 is emitted through the two light guide plates, and the light emitted from the light guide plate is directed generally in one direction, for example, the left side. As shown in FIG. 3, the light ray a emitted by the second light source 12 is reflected by the inclined side of the right triangle of the lower light guide plate 22 and then deflected to the left side; the light ray c emitted by the second light source 12 passes through the right triangle of the lower light guide plate 22. After the inclined edge is reflected, it is deflected to the left side via the upper light guide plate; the light emitted by the second light source 12 is refracted by the inclined edge of the right triangle on the lower light guide plate 22, and the light b reflected by the reflective sheet passes through the lower light guide plate. After the inclined edge of the right triangle on 22 is reflected, it is refracted by the inclined side of the right triangle of the upper light guide plate 21 and then deflected to the left side. As can be seen from Fig. 3, the light emitted from the second light source 12 is reflected and refracted by the lower light guide plate and the upper light guide plate, and the emitted light is deflected to the left side. Similarly, as shown in Fig. 2, when the first light source 11 is turned on, the light from the first light source 11 passes through the two light guide plates, and the light emitted from the light guide plate is directed toward the other direction, for example, the right side. As shown in FIG. 2, the light e emitted by the first light source 11 is refracted by the inclined side of the right triangle of the upper light guide plate 21, and then is repeatedly emitted from the upper light guide plate through the multiple refraction of the lower light guide plate, and the emitted light is directed to the right. The side light is deflected; the light ray f emitted from the first light source 11 is refracted by the inclined side of the right triangle on the upper light guide plate 21 and is directly deflected to the right side. As can be seen from Fig. 2, the light emitted from the first light source 11 is reflected and refracted multiple times by the lower light guide plate and the upper light guide plate, and the emitted light is deflected to the right side. In this way, the images displayed on the display screen respectively reach the left and right eyes of the person through different directions, so that the eyes of the person see different visual images and generate a stereoscopic feeling.

It should be noted that the optical path of the light in the drawings in the embodiment of the present invention is only partially reflected and Refraction, which is mainly used to analyze the deflection of light emitted by each light source. In actual process, the light emitted by each light source is reflected and refracted multiple times by the upper light guide plate and the lower light guide plate, and finally emitted from the upper light guide plate. However, no matter how many times the light is reflected and refracted, the light from the light source located on the left side of the light guide plate is deflected to the right after being emitted from the upper light guide plate, and is received by the left eye of the person; The light is finally deflected to the left after being emitted from the upper light guide plate, and is received by the right eye of the person. In this way, the images displayed on the display screen pass through the left and right eyes respectively in different directions, so that the eyes of the person see different visual images, resulting in a stereoscopic feeling.

A backlight module and a display device are provided in the embodiment of the present invention. The backlight module includes two light guide plates arranged in a stack, and a light source disposed on each side of the light guide plate opposite to a light guide plate, wherein The light emitted by the light source on the right side of the light guide plate is deflected to one side after being repeatedly reflected and refracted by the light guide plate; the light emitted from the light source located on the left side of the light guide plate is reflected and refracted by the light guide plate to the light source on the right side. The emitted light is deflected in different directions of deflection. In this way, the light is deflected in different directions by the backlight module, and the stereoscopic display can be realized without using other structures such as a grating, and the display brightness can be improved.

The above description is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and many other variations or alternatives can be easily conceived by those skilled in the art within the technical scope of the present disclosure. Variations and substitutions are intended to be included within the scope of the invention.

Claims

claims

1. A backlight module, including:

The first light guide plate and the second light guide plate are stacked; and

a first light source arranged opposite to the first light guide plate, and a second light source arranged opposite to the second light guide plate, wherein the first light source and the second light source are located on opposite sides of the two light guide plates;

Wherein, a micro-groove structure is provided on the upper surface of the first light guide plate and the second light guide plate or on the lower surface of the first light guide plate and the second light guide plate, and each of the light guide plates The farther away the micro-groove structure is from its opposite light source, the higher the height of the micro-groove structure is.

2. The backlight module according to claim 1, wherein the micro-groove structure is formed in multiple rows on the light guide plate, and the farther away from the light source facing it, the smaller the spacing between two adjacent rows.

3. The backlight module according to claim 2, wherein each row includes a plurality of micro-groove structures, and the micro-groove structures located in the same row are evenly distributed.

4. The backlight module according to claim 2 or 3, wherein the farther the micro-groove structure is from its opposite light source, the more micro-groove structures each row includes.

5. The backlight module according to any one of claims 1 to 4, wherein the micro-groove structure is a triangular groove.

6. The backlight module according to any one of claims 1 to 5, wherein the micro-groove structure is a right-angled triangular groove.

7. The backlight module according to claim 6, wherein the inclination angles of the inclined sides of the right-angled triangular grooves on the first and second light guide plates are the same.

8. The backlight module according to claim 7, wherein the inclination angle of the inclined side of the right-angled triangle groove is between 40° and 60°. between.

9. The backlight module according to any one of claims 1 to 8, wherein the height of the light source is the same as the height of the light guide plate.

10. A display device, including: a backlight module and a display screen, wherein the backlight module is the backlight module according to any one of claims 1-9.