US20190113805A1 - Backlight module, display panel, display device - Google Patents

Abstract

A backlight module, a display panel and a display device. The backlight module includes a first light transmission substrate arranged on a light-emitting face. A projection of the first light transmission substrate on the light-emitting face coincides with the light-emitting face. A first reflection mirror and a second reflection mirror are also arranged on the first light transmission substrate. The first and second reflection mirrors are spaced apart and facing each other, and the second reflection mirror is arranged in such a way as to enable vertical emergent light on the light-emitting face to be incident to the first reflection mirror after undergoing a total reflection. The first reflection mirror is arranged in such a way as to enable light reflected by the second reflection mirror to exit after undergoing a total reflection. A plurality of light transmission holes are evenly distributed on the second reflection mirror.

Description

RELATED APPLICATION
• This application claims priority to the Chinese patent application No. 201710948682.2 filed on Oct. 12, 2017, and entire contents thereof are incorporated herein by reference.
TECHNICAL FIELD
• The present disclosure relates to the technical field of displays, in to particular to a backlight module, a display panel and a display device.
BACKGROUND
• In order to see clearly what is displayed on an LCD display, a backlight module is needed. The backlight module is an optical assembly inside of a liquid crystal display that includes such necessary optical components as a light source, film, reflector, back plate, etc. It is packaged by a glue frame.
SUMMARY
• According to one aspect of the present disclosure, a backlight module15 provided, which comprises a light-emitting face with a lightproof adhesive tape provided at the edge thereof; a first light transmission substrate arranged on the light-emitting face and whose projection on the light-emitting face coincides with the light-emitting face; and a first reflection mirror and a second reflection mirror arranged on the first light transmission substrate, which are spaced apart and facing each other, wherein a projection of the first reflection mirror on the light-emitting face coincides with a projection of the lightproof adhesive tape on the light-emitting face, the second reflection mirror is arranged in such a way as to enable vertical emergent light on the light-emitting face to be incident to the first reflection mirror after undergoing a total reflection, and the first reflection mirror is arranged in such a way as to enable light reflected by the second reflection mirror to exit after undergoing a total reflection; and wherein a plurality of light transmission holes are evenly distributed on the second reflection mirror, whose directions of extension are perpendicular to the light-emitting face.
• In some embodiments, the first reflection mirror and the second reflection mirror are arranged to be parallel to each other, and both the first reflection mirror and the second reflection mirror form an included angle of 45 degrees with the light-emitting face.
• In some embodiments, the backlight module further comprises: a second light transmission substrate, whose projection on the light-emitting face coincides with the projection of the first light transmission substrate on the light-emitting face, and the first reflection mirror and the second reflection mirror are arranged between the first light transmission substrate and the second light transmission substrate.
• In some embodiments, a first prism and a second prism are arranged between the first light transmission substrate and the second light transmission substrate, whose cross sections have the shape of an isosceles right triangle, said first prism and second prism being spaced apart and having their bottoms facing each other, and the bottoms being used as the first reflection mirror and the second reflection mirror, respectively; and
• wherein one side of the first prism contacts the first light transmission substrate, and its projection on the light-emitting face coincides with the projection of the lightproof adhesive tape on the light-emitting face; and one side of the second prism contacts the second light transmission substrate, and a plurality of light transmission holes are evenly distributed on the second prism.
• In some embodiments, scattered particles are evenly distributed in the second light transmission substrate.
• In some embodiments, the scattered particles are made of metal oxides.
• In some embodiments, both the first light transmission substrate and the second light transmission substrate are made of hard light transmission materials and have a light transmittance of above 90%.
• In some embodiments, the backlight module comprises a back plate with multiple scattered netted dots arranged thereon, and the number of the light transmission holes is proportional to the number of the scattered netted dots.
• According to another aspect of the present disclosure, a display panel is also provided, which comprises the backlight module described in any one of the embodiments above.
• According to still another aspect of the present disclosure, a display device is further provided, which comprises the display panel as described above.
BRIEF DESCRIPTION OF THE DRAWINGS
• In order to describe the technical solutions in the embodiments of the present disclosure more clearly, the drawings that need to be used for the description will be introduced briefly below. Apparently, the drawings in the descriptions below are merely some of the embodiments of the present disclosure. Those skilled in the art can obtain other drawings from these drawings.
• FIG. 1 is a schematic drawing of a light-emitting face of a backlight module of the related art;
• FIG. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;
• FIG. 3 is a schematic structural diagram of a backlight module according to another embodiment of the present disclosure.
DETAILED DESCRIPTION
• To further clarify the objects, technical solutions and advantages of the present disclosure, a more particular description of the present disclosure is rendered below in conjunction with specific embodiments and with reference to the drawings.
• It shall be noted that the wordings “first” and “second” used in the embodiments of the present disclosure are to distinguish different entities or different parameters of two identical names. Therefore, the wordings “first” and “second are only used for facilitating description, but they should not be interpreted as limiting the embodiments of the present disclosure.
• FIG. 1 is a schematic drawing of a light-emitting face of a backlight module of the related art. Referring toFIG. 1, a lightproofadhesive tape102 is arranged at the edge of a glue frame of abacklight module100. On a light-emittingface101 of thebacklight module100, since the lightproofadhesive tape102 has a certain width, it will occupy the edge of the light-emittingface101, so that the light-emitting area of the light-emittingface101 is only the area surrounded by the lightproofadhesive tape102. As a result, the effect of frameless light emission cannot be achieved.
• FIG. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure. Referring toFIG. 2, the backlight module described in this embodiment comprises: a firstlight transmission substrate1 arranged on the light-emittingface101, a projection of the firstlight transmission substrate1 on the light-emitting face coinciding with the light-emitting face; and afirst reflection mirror2 and asecond reflection mirror3 arranged on the firstlight transmission substrate1, which are spaced apart and facing each other.
• The firstlight transmission substrate1 is arranged on the surface of the light-emittingface101, with its shape and size being adapted to the light-emittingface101, so that its projection coincides with the surface of the light-emittingface101. In addition, the firstlight transmission substrate1 is made of a hard light transmission material. The first hardlight transmission substrate1 carries thefirst reflection mirror2 and thesecond reflection mirror3 thereon, meanwhile, it can enable the light emitted from the light-emittingface101 to penetrate through the firstlight transmission substrate1 and irradiate on thefirst reflection mirror2 and thesecond reflection mirror3 because of its light transmission property.
• Thefirst reflection mirror2 and thesecond reflection mirror3 are spaced apart and facing each other on the firstlight transmission substrate1. Thefirst reflection mirror2 is arranged in such a way as that its projection on the light-emittingface101 coincides with the projection of the lightproofadhesive tape102 on the light-emittingface101, namely, viewing from a direction perpendicular to the light-emittingface101, thefirst reflection mirror2 can completely cover the lightproofadhesive tape102. Thesecond reflection mirror3 is arranged at an inner side of the first reflection mirror2 (near a center of the light-emitting face101) and is at a certain distance from thefirst reflection mirror2.
• Thefirst reflection mirror2 and thesecond reflection mirror3 are both arranged at a certain angle to the light-emittingface101. Specifically, the vertical emergent light emitted from the projection position corresponding to thesecond reflection mirror3 on the light-emittingface101 will irradiate on thesecond reflection mirror3. Thesecond reflection mirror3 is arranged at a certain angle to the light-emittingface101, such that thesecond reflection mirror3 enables the vertical emergent light emitted from the projection position corresponding to thesecond reflection mirror3 on the light-emittingface101 to be incident on thefirst reflection mirror2 after undergoing a total reflection. Thefirst reflection mirror2 is arranged at a certain angle to the light-emittingface101, such that thefirst reflection mirror2 enables the incident light to undergo a total reflection again and then exit along an emitting direction of the light-emitting face101 (a direction perpendicular to the light-emitting face101), as shown by light A inFIG. 2. A plurality oflight transmission holes301 are evenly distributed on thesecond reflection mirror3, whose directions of extension are perpendicular to the light-emittingface101. A part of the vertical emergent light emitted from the projection position corresponding to thesecond reflection mirror3 on the light-emittingface101 will propagate through thelight transmission holes301 along the original propagation path, as shown by light B inFIG. 2.
• It can be seen that in the backlight module of the present embodiment, by means of the two times of total reflection on thefirst reflection mirror2 and thesecond reflection mirror3, a part of the emergent light on the light-emittingface101 is directed to the position corresponding to the lightproofadhesive tape102 to exit, so that the light-emitting area on the light-emittingface101 expands to the part covered by the lightproofadhesive tape102. As far as the visual effect is concerned, the entire light-emittingface101 is emitting light, thereby realizing frameless light emission.
• In this embodiment, the specific degrees of the angles formed from thefirst reflection mirror2 and thesecond reflection mirror3 to the light-emittingface101 can be selected flexibly as desired, as long as the corresponding incident light can be totally reflected. In certain exemplary embodiments, referring toFIG. 2, thefirst reflection mirror2 and thesecond reflection mirror3 are parallel to each other, and they both form an angle of 45° with the light-emittingface101.
• In this embodiment, thefirst reflection mirror2 and thesecond reflection mirror3 can be fixed on the firstlight transmission substrate1 through adhering, an auxiliary fixing member or other common fixing and connecting means.
• In another embodiment, referring toFIG. 3, the backlight module may further comprise a secondlight transmission substrate4, whose projection on the light-emitting face coincides with the projection of the firstlight transmission substrate1 on the light-emitting face. The shape and size of the secondlight transmission substrate4 are adapted to the firstlight transmission substrate1. Afirst prism200 and asecond prism300 are arranged between the firstlight transmission substrate1 and the secondlight transmission substrate4, whose cross sections have the shape of an isosceles right triangle. The firstlight transmission substrate1 and the secondlight transmission substrate4 are both made of a hard light transmission material. The firstlight transmission substrate1 carries thefirst prism200 and thesecond prism300, while the secondlight transmission substrate4 protects thefirst prism200 and thesecond prism300 from the outside. In addition, considering the effect of light transmission, the firstlight transmission substrate1 and the secondlight transmission substrate4 both have a light transmittance of above 90%.
• Thefirst prism200 and thesecond prism300 are spaced apart with their bottoms facing each other. Specifically, the bottom of the first prism200 (i.e. the bottom facing the angle formed by the two orthogonal sides of the prism) faces the bottom of thesecond prism300, and they correspond to the first reflection mirror and the second reflection mirror mentioned in the above embodiment, respectively.
• One side of thefirst prism200 contacts the firstlight transmission substrate1, and its projection on the light-emittingface101 coincides with the projection of the lightproofadhesive tape102 on the light-emittingface101, i.e. viewing from the direction perpendicular to the light-emittingface101, this side of thefirst prism200 can completely cover the lightproofadhesive tape102. One side of thesecond prism300 contacts the secondlight transmission substrate4. The cross sections of thefirst prism200 and thesecond prism300 have the shape of an isosceles right triangle, so the facing bottoms of thefirst prism200 and thesecond prism300 both form an angle of 45 degrees with the light-emittingface101. Based on such a structure, the bottom of thesecond prism300 enables the vertical emergent light emitted from the projection position corresponding to thesecond prism300 on the light-emittingface101 to be incident on the bottom of thefirst prism200 after being totally reflected. The bottom of thefirst prism200 enables the incident light to be totally reflected again and then exit along the emitting direction of the light-emittingface101, as shown by light A inFIG. 3. A plurality of light transmission holes301 are evenly distributed on thesecond prism300, whose directions of extension are perpendicular to the light-emittingface101. A part of the vertical emergent light emitted from the projection position corresponding to thesecond prism300 on the light-emittingface101 will propagate through the light transmission holes301 along the original propagation path, as shown by light B inFIG. 3.
• In this embodiment, some scattered particles can be evenly distributed in the secondlight transmission substrate4. The scattered particles can make light passing through the secondlight transmission substrate4 to scatter, so that the light emitted from theentire backlight module100 looks softer and more uniform. The scattered particles are made of metal oxides, such as titanium dioxide, barium sulfate, magnesium oxide, silicon oxide, zinc oxide, lithopone or zirconia.
• In certain exemplary embodiments, the backlight module comprises a back plate with multiple scattered netted dots arranged thereon, the netted dots make the light to scatter and then exit from the light-emitting face, thereby increasing brightness of the backlight module. In the backlight module of the embodiment of the present disclosure, the number of the light transmission holes on the second reflection mirror is arranged to be proportional to the number of the scattered netted dots in the backlight module. When the number of scattered netted dots is large, the number of the light transmission holes should increase correspondingly, so that enough light can be directed to the position corresponding to the lightproof adhesive tape to be emitted, besides, while realizing frameless light emission, non-uniform light emission at different areas of the backlight module can be avoided.
• It shall be noted thatFIG. 2 andFIG. 3 only show positions of an edge and an end of thebacklight module100. Thebacklight module100 usually has a fixed shape (rectangle), and the projection of thefirst reflection mirror2 on the light-emitting face coincides with the projection of the lightproofadhesive tape102 on the light-emitting face, so those skilled in the art shall understand that the structure as described in this embodiment exists on all edge positions of the light-emittingface101 of thebacklight module100.
• Based on the same inventive concept, an embodiment of the present disclosure further provides a display panel, which comprises the backlight module provided in any of the above embodiments.
• In the display panel provided in the present embodiment, the technical effect of frameless light emission of the backlight module is achieved by means of the backlight module described in any of the above embodiments of the present disclosure.
• The display panel can be applied to a liquid crystal television and a liquid crystal display, moreover, it can be applied to display devices that need backlight, such as digital photo frames, electronic paper, mobile phones, etc.
• Based on the same inventive concept, an embodiment of the present disclosure further provides a display device, which comprises the display panel described in the above embodiment.
• In the display device provided in this embodiment, by using the display panel described in the above embodiment of the present disclosure, the display effect of the display device is significantly improved owing to the effect of frameless light emission of the backlight module in the display panel.
• The display device can be any product or component with a display function, such as liquid crystal panel, electronic paper, mobile phone, tablet PC, television, display, laptop, digital photo frame, navigator, etc.
• Those skilled in the art shall understand that any of the above embodiments is only discussed as an example, but it does not intend to mean that the scope (including the claims) of the present disclosure is limited within these examples. Technical features in different embodiments can be combined, and the sequence of carrying out the steps is not restrictive.
• The embodiments of the present disclosure intend to encompass all replacements, modifications and variations that fall into the wide scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement and so on made under the spirit and principle of the present disclosure shall fall into the protection scope of the present disclosure.

Claims (17)

1. A backlight module, comprising:

a light-emitting face with a lightproof adhesive tape provided at an edge of the light-emitting face;

a first light transmission substrate arranged on the light-emitting face, wherein a projection of the first light transmission substrate on the light-emitting face coincides with the light-emitting face; and

a first reflection mirror and a second reflection mirror, wherein the first and second reflection mirrors are arranged on the first light transmission substrate and are spaced apart and facing each other, wherein a projection of the first reflection mirror on the light-emitting face coincides with a projection of the lightproof adhesive tape on the light-emitting face, wherein the second reflection mirror is arranged in such a way as to enable vertical emergent light on the light-emitting face to be incident to the first reflection mirror after undergoing a total reflection, and wherein the first reflection mirror is arranged in such a way as to enable light reflected by the second reflection mirror to exit after undergoing a total reflection; and

wherein a plurality of light transmission holes are evenly distributed on the second reflection mirror, and directions of extension of the light transmission holes are perpendicular to the light-emitting face.

2. The backlight module according toclaim 1, wherein the first reflection mirror and the second reflection mirror are arranged to be parallel to each other, and both the first reflection mirror and the second reflection mirror form an included angle of 45° with the light-emitting face.

3. The backlight module according toclaim 2, further comprising a second light transmission substrate,

wherein a projection of the second light transmission substrate on the light-emitting face coincides with the projection of the first light transmission substrate on the light-emitting face, and

wherein the first reflection mirror and the second reflection mirror are arranged between the first light transmission substrate and the second light transmission substrate.

4. The backlight module according toclaim 3, further comprising a first prism and a second prism;

wherein the first and second prism are arranged between the first light transmission substrate and the second light transmission substrate,

wherein cross sections of the first and second prisms have the shape of an isosceles right triangle;

wherein the first prism and second prism are spaced apart and having their bottoms facing each other;

wherein the bottoms of the first and second prisms are used as the first reflection mirror and the second reflection mirror respectively; and

wherein one side of the first prism contacts the first light transmission substrate, and its projection on the light-emitting face coincides with the projection of the lightproof adhesive tape on the light-emitting face;

wherein one side of the second prism contacts the second light transmission substrate; and

wherein a plurality of light transmission holes are evenly distributed on the second prism.

5. The backlight module according toclaim 3, wherein scattered particles are evenly distributed in the second light transmission substrate.

6. The backlight module according toclaim 5, wherein the scattered particles are made of metal oxides.

7. The backlight module according toclaim 3, wherein both the first light transmission substrate and the second light transmission substrate are made of hard light transmission materials and have a light transmittance of above 90%.

8. The backlight module according toclaim 1, wherein the backlight module further comprises a back plate with multiple scattered netted dots arranged thereon, and the number of the light transmission holes is proportional to the number of the scattered netted dots.

9. A display panel, comprising the backlight module according toclaim 1.

10. The display panel according toclaim 9, wherein the first reflection mirror and the second reflection mirror are arranged to be parallel to each other, and both the first reflection mirror and the second reflection mirror form an included angle of 45° with the light-emitting face.

11. The display panel according toclaim 10, wherein the backlight module further comprises a second light transmission substrate,

wherein a projection of the second light transmission substrate on the light-emitting face coincides with the projection of the first light transmission substrate on the light-emitting face, and

wherein the first reflection mirror and the second reflection mirror are arranged between the first light transmission substrate and the second light transmission substrate.

12. The display panel according toclaim 11, further comprising a first prism and a second prism;

wherein the first and second prism are arranged between the first light transmission substrate and the second light transmission substrate,

wherein cross sections of the first and second prisms have the shape of an isosceles right triangle;

wherein the first prism and second prism are spaced apart and having their bottoms facing each other;

wherein the bottoms of the first and second prisms are used as the first reflection mirror and the second reflection mirror respectively; and

wherein one side of the first prism contacts the first light transmission substrate, and its projection on the light-emitting face coincides with the projection of the lightproof adhesive tape on the light-emitting face;

wherein one side of the second prism contacts the second light transmission substrate; and

wherein a plurality of light transmission holes are evenly distributed on the second prism.

13. The display panel according toclaim 11, wherein scattered particles are evenly distributed in the second light transmission substrate.

14. The display panel according toclaim 13, wherein the scattered particles are made of metal oxides.

15. The display panel according toclaim 11, wherein both the first light transmission substrate and the second light transmission substrate are made of hard light transmission materials and have a light transmittance of above 90%.

16. The display panel according toclaim 9, wherein the backlight module further comprises a back plate with multiple scattered netted dots arranged thereon, and the number of the light transmission holes is proportional to the number of the scattered netted dots.

17. A display device, which comprises the display panel according toclaim 9.

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