Backlight, assembly method thereof and display device

A backlight, an assembly method thereof and a display device are disclosed. The backlight includes a light source configured to emit light having a first wavelength; a wavelength converter disposed on a light-emitting side of the light source and configured to convert the light having the first wavelength into light having a second wavelength upon passing through the wavelength converter, in which the second wavelength is different from the first wavelength; and a light guide plate disposed on one side of the wavelength converter away from the light source, and configured to receive and re-emit the light emitted from the wavelength converter.

The application is a U.S. National Phase Entry of International Application No. PCT/CN2017/073858 filed on Feb. 17, 2017, designating the United States of America and claiming priority to Chinese Patent Application No. 201610326436.9 filed on May 17, 2016. The present application claims priority to and the benefit of the above-identified applications and the above-identified applications are incorporated by reference herein in their entirety.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a backlight, an assembly method thereof and a display device.

BACKGROUND

Liquid crystal display (LCD) device is a currently widely used display device and generally includes a display panel and a backlight for bearing the display panel and providing backlight for the display panel. In the existing LCD device, a wavelength of light emitted by the backlight basically has been determined when produced by backlight manufacturers. However, with the increased requirements on the display effect of the LCD device, an improvement in the color gamut of the LCD device has become the trends of future technical development.

SUMMARY

Embodiments of the present disclosure provide a backlight, an assembly method thereof and a display device to increase the color gamut of the display device.

At least one embodiment of the present disclosure provides a backlight, including: a light source configured to emit light having a first wavelength; a wavelength converter disposed on a light-emitting side of the light source and configured to convert the light having the first wavelength into light having a second wavelength upon passing through the wavelength converter, the second wavelength being different from the first wavelength; and a light guide plate (LGP) disposed on one side of the wavelength converter away from the light source, and configured to receive and re-emit the light emitted from the wavelength converter.

For example, the LGP includes a light-emitting surface and a reflecting surface opposite to each other, and further includes a light-incident surface connecting the light-emitting surface and the reflecting surface; and the wavelength converter is disposed between the light source and the light-incident surface of the LGP.

For example, the wavelength converter includes: a wavelength conversion component configured to convert the light having the first wavelength into the light having the second wavelength; and a fixing component including a side wall for providing an accommodating space, wherein the wavelength conversion component is disposed in the accommodating space of the fixing component.

For example, the side wall of the fixing component includes a first protrusion and a second protrusion which are protruded towards the wavelength conversion component; and the wavelength conversion component is disposed between the first protrusion and the second protrusion.

For example, the side wall of the fixing component further includes a third protrusion protruded towards the wavelength conversion component; the first protrusion, the second protrusion and the third protrusion are all disposed on a first side of the wavelength conversion component; and the third protrusion is disposed between the first protrusion and the second protrusion.

For example, the side wall of the fixing component further includes a fourth protrusion and a fifth protrusion which are protruded towards the wavelength conversion component; the fourth protrusion and the fifth protrusion are disposed on a second side of the wavelength conversion component; and the second side of the wavelength conversion component is opposite to the first side of the wavelength conversion component.

For example, the side wall of the fixing component forms a reflection cavity located between the light source and the wavelength conversion component; and the side wall of the fixing component is provided with a reflecting surface at the reflection cavity.

For example, the reflecting surface is inclined relative to the light-emitting side of the light source.

For example, in a direction from the reflection cavity to the accommodating space, an aperture of the reflection cavity is gradually increased.

For example, an opening is formed on an end portion of the fixing component; and the light source is disposed at the opening.

For example, the side wall of the fixing component includes a first housing and a second housing opposite to each other, so as to form the accommodating space.

For example, the wavelength conversion component includes a luminescent material.

For example, the backlight further includes a heat sink, wherein the heat sink includes a baffle and a bearing board connected with the baffle; an accommodating space is formed between the baffle and the bearing board; and the light source, the wavelength converter and the LGP are disposed in the accommodating space of the cooling pad.

For example, the bearing board of the heat sink includes a lug boss protruded towards the LGP; and the lug boss is disposed on one side of the wavelength converter away from the light source, so as to limit a position of the wavelength converter.

For example, the backlight further includes a rubber frame, wherein the rubber frame includes a baffle and a positioning structure connected with the baffle; an accommodating space is formed between the baffle and the positioning structure; and the light source and the wavelength converter are disposed in the accommodating space of the rubber frame.

For example, the positioning structure of the rubber frame is provided with a projection; and the projection is disposed on one side of the wavelength converter away from the light source, so as to limit a position of the wavelength converter.

At least one embodiment of the present disclosure further provides a display device including any of the above-mentioned backlights.

At least one embodiment of the present disclosure further provides an assembly method of a backlight, including: arranging a wavelength converter on a light-emitting side of a light source, the wavelength converter being configured to convert light having a first wavelength into light having a second wavelength upon the light passing through the wavelength converter, and the second wavelength being different from the first wavelength; and arranging a light guide plate (LGP) on one side of the wavelength converter away from the light source so that the LGP is disposed within an irradiation range of light emitted from the wavelength converter.

For example, the wavelength converter includes a fixing component and a wavelength conversion component; the fixing component includes a first housing and a second housing which are arranged opposite to each other to form an accommodating space. The assembly method of the wavelength converter includes: applying opposite acting forces to end portions of the first housing and the second housing in the fixing component of the wavelength converter, respectively, so as to form a gap between the first housing and the second housing; and placing the wavelength conversion component in the accommodating space through the gap.

For example, the assembly method further includes: placing a rubber frame on the light source, the wavelength converter and the LGP so as to fix relative positions of the light source, the wavelength converter and the LGP.

REFERENCE NUMERALS

DETAILED DESCRIPTION

Hereafter, the technical solutions in the embodiments of the present disclosure will be described in a clearly and fully understandable way in connection with the drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are just a part but not all of the embodiments of the disclosure. Based on the described embodiments herein, one person skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the disclosure.

Unless otherwise defined, the technical terminology or scientific terminology used herein should have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Likewise, terms like “first,” “second,” etc., which are used in the description and the claims of the present application for invention, are not intended to indicate any sequence, amount or importance, but distinguish various components. The phrases “connect”, “connected”, etc., are not intended to define a physical connection or mechanical connection, but may include an electrical connection, directly or indirectly. “On,” “under,” “left,” “right” or the like is only used to describe a relative positional relationship, and when the absolute position of a described object is changed, the relative positional relationship might also be changed accordingly.

Embodiments of the present disclosure provide a backlight, an assembly method thereof and a display device. A wavelength converter is disposed between a light source and an LGP of the backlight, and the wavelength converter can convert a wavelength of light emitted by the light source, so that the color gamut of the display device can be increased.

As illustrated inFIG. 1, at least one embodiment of the present disclosure provides a backlight including a light source10, a wavelength converter20and an LGP30. The light source10is configured to emit light with a first wavelength (as illustrated by an arrow on the left inFIG. 1); the wavelength converter20is disposed on a light-emitting side of the light source10(namely one side of a light-emitting surface11aof the light source10closer to the LGP300) and configured to convert the light with the first wavelength into light with a second wavelength (as illustrated by an arrow on the right inFIG. 1) after passing through the wavelength converter20, and the second wavelength is different from the first wavelength; and the LGP30is disposed on one side of the wavelength converter20away from the light source10and is configured to receive light emitted from the wavelength converter20and re-emit the light.

It should be noted that the light with the first wavelength and the light with the second wavelength may both be light with a single wavelength, and may also be light with specific wavelength range. When both the light with the first wavelength and the light with the second wavelength are light with specific wavelength range, partial wavelength range or the entire wavelength range of the light with the first wavelength may be converted by the wavelength converter20to obtain the light with the second wavelength. The light emitted from the wavelength converter20may be the light with the second wavelength, and may also be light obtained by processing the light with the second wavelength via other optical elements in the wavelength converter. In addition, the arrows inFIG. 1are only used for illustratively representing the light with the first wavelength and the light with the second wavelength.

For instance, the backlight provided by at least one embodiment of the present disclosure may be an edge-lit backlight. That is to say, the LGP30includes a light-emitting surface30aand a reflecting surface30bopposite to each other, and further includes a light-incident surface30cfor connecting the light-emitting surface30aand the reflecting surface30b; and the wavelength converter20may be disposed between the light source10and the light-incident surface30cof the LGP30. In this case, the light emitted from the wavelength converter20may be incident into the LGP30through the light-incident surface30cof the LGP30, and then emitted through the light-emitting surface30aof the LGP30and enter a display panel included in the display device. Use of the edge-lit backlight can simplify the structure of the backlight and provide convenience for the assembly of the wavelength converter20.

For instance, the backlight provided by at least one embodiment of the present disclosure may further include a heat sink40. The heat sink40may include a baffle41and a bearing board42connected with the baffle41; an accommodating space43is formed between the baffle41and the bearing board42; and the light source10, the wavelength converter20and the LGP30may be disposed in the accommodating space43of the heat sink40.

For instance, the bearing board42of the heat sink40may include a lug boss44protruded towards the LGP30; and the lug boss44is disposed on one side of the wavelength converter20away from the light source10, so as to limit a position of the wavelength converter20. As illustrated inFIG. 1, the lug boss44includes a side surface44afacing the wavelength converter20, so that the lug boss44can function for preventing the wavelength converter20from moving towards the LGP30; in this way, the mechanical performance of the backlight can be improved.

For instance, the backlight provided by at least one embodiment of the present disclosure may further include a rubber frame50. The rubber frame50may include a baffle51and a positioning mechanism52connected with the baffle51; an accommodating space53is formed between the baffle51and the positioning structure52; and the light source10and the wavelength converter20are disposed in the accommodating space53of the rubber frame50.

For instance, the positioning structure52of the rubber frame50may be provided with a projection54. The projection54is disposed on one side of the wavelength converter20away from the light source10, so as to limit a position of the wavelength converter20. As illustrated inFIG. 1, the projection54includes a side surface54afacing the wavelength converter20, so that the projection54can function for preventing the wavelength converter20from moving towards the LGP30; in this way, the mechanical performance of the backlight can be improved.

For instance, a lower surface52aof the positioning structure52of the rubber frame50that is facing the wavelength converter20may also limit the position of the wavelength converter20, so as to prevent the wavelength converter20from moving in a direction away from the bearing board42of the heat sink40. Thus, the mechanical performance of the backlight can be further improved.

Of course, as illustrated inFIG. 1, the positioning structure52of the rubber frame50may also be provided with other projections (not illustrated inFIG. 1), so as to limit the position of the light source10and/or the baffle41of the heat sink40.

For instance, the light source10may include luminescent elements11and a circuit board12connected with the luminescent elements11. For instance, the luminescent elements may be light-emitting diode (LED) luminescent elements, organic light-emitting diode (OLED) luminescent elements, etc. For instance, the circuit board12may be a printed circuit board (PCB), e.g., a flexible PCB.

For instance, the light source10and/or the wavelength converter20may be connected with the heat sink40so as to improve the mechanical performance of the light source. For instance, as illustrated inFIG. 1, the circuit board12of the light source10may be connected with the baffle41of the heat sink40through a connecting piece45such as an adhesive (e.g., glue). For instance, the wavelength converter20may be connected with the bearing board42of the heat sink40through a connecting piece46such as an adhesive (e.g., glue).

Of course, the backlight may further include: an optical membrane62disposed on the LGP30; and structures such as a reflector plate63and a backplane64which are disposed between the LGP30and the heat sink40. No further description will be given herein to these structures.

Detailed description will be given below to the wavelength converter20with reference toFIGS. 1 to 3c.

For instance, as illustrated inFIG. 1, the wavelength converter20may include a wavelength conversion component22and a fixing component21. The wavelength conversion component22is configured to convert the light with the first wavelength into the light with the second wavelength. For instance, the wavelength conversion component22may include a luminescent material. The luminescent material may be, for instance, quantum dot or fluorescent agent. For instance, the wavelength conversion component22may further include a transparent container for accommodating the luminescent material, e.g., a glass tube. The fixing component21of the wavelength converter20is used for fixing the wavelength conversion component22. As illustrated inFIG. 2, the fixing component21includes a side wall210for providing an accommodating space213, and the wavelength conversion component22is disposed in the accommodating space213of the fixing component21.

For instance, as illustrated inFIG. 2, the side wall210of the fixing component21may include a first protrusion210aand a second protrusion210bwhich are protruded towards the wavelength conversion component22. The wavelength conversion component22is disposed between the first protrusion210aand the second protrusion210b, so that the first protrusion210aand the second protrusion210bcan fix the wavelength conversion component22in the accommodating space213of the fixing component21.

For instance, the side wall210of the fixing component21may further include a third protrusion210cprotruded towards the wavelength conversion component22; the first protrusion210a, the second protrusion210band the third protrusion210care all disposed on a first side of the wavelength conversion component22(as illustrated by the upper side of the wavelength conversion component22inFIG. 2); and the third protrusion210cis disposed between the first protrusion210aand the second protrusion210b. Thus, the side wall210of the fixing component21may form an M-shaped structure215through the first, second and third protrusions. The M-shaped structure215may fix the wavelength conversion component22in the transverse direction and the longitudinal direction. Moreover, the M-shaped structure has high mechanical strength.

For instance, the side wall210of the fixing component21may further include a fourth protrusion210dand a fifth protrusion210ewhich are protruded towards the wavelength conversion component22; the fourth protrusion210dand the fifth protrusion210eare disposed on a second side of the wavelength conversion component22(as illustrated by the lower side of the wavelength conversion component22inFIG. 2); and the second side of the wavelength conversion component22is opposite to the first side of the wavelength conversion component22. In this way, the wavelength conversion component22may be further fixed by the arrangement of the fourth and fifth protrusions.

For instance, the side wall210of the fixing component21may also form a reflection cavity214located between the light source (not illustrated inFIG. 2) and the wavelength conversion component22. The side wall210of the fixing component21is provided with a reflecting surface214aat the reflection cavity214. By the arrangement of the reflection cavity214, the light emitted by the light source may be reflected by the reflecting surface214aand then enter the wavelength conversion component22. Thus, the light utilization rate and the light mixing effect can be improved, so that the wavelength converter20can have better optical coupling property.

For instance, the reflecting surface214amay be inclined relative to the light-emitting side (as illustrated by11ainFIG. 1) of the light source10. As the light emitted by the light source has multiple, different radiation directions, the inclined arrangement is more favorable for the reflecting surface214ato reflect the light emitted by the light source. It should be noted that the inclination angle of the reflecting surface214amay be set according to the luminescent elements of the light source as adopted. No further description will be given herein.

For instance, in a direction from the reflection cavity214to the accommodating space213of the wavelength conversion component22(namely in the direction from the reflection cavity214to the wavelength conversion component22), an aperture of the reflection cavity214is gradually increased. Thus, it may be more favorable for the reflecting surface214ato reflect the light emitted by the light source adopting luminescent elements such as LEDs or OLEDs.

Detailed description will be given below to the fixing component21of the wavelength converter20with reference toFIGS. 3ato3c.

For instance, as illustrated inFIGS. 3aand 3b, an opening217may be formed on an end portion219(not illustrated inFIG. 3b) of the fixing component21away from the accommodating space213(not illustrated inFIG. 3b), and the light source (not illustrated inFIGS. 3aand 3b) is disposed at the opening217. Thus, the light source and the wavelength converter can be more compactly assembled together, so as to improve the optical coupling property of the wavelength converter.

For instance, as illustrated inFIGS. 3aand 3b, the end portion219of the fixing component21may include a first extension219aand a second extension219bwhich are extended towards the direction away from the opening217; and the extending directions of the second extension219band the first extension219aare on a same line. As illustrated inFIG. 1, by means of the first and second extensions (not illustrated inFIG. 1), the wavelength converter20can be stably disposed on the circuit board12of the light source10, which facilitates improving the mechanical performance of the backlight.

For instance, the side wall210of the fixing component21may include a first housing211and a second housing212opposite to each other, so as to form an accommodating space213. By utilizing the first housing211and the second housing212, the structure of the fixing component21is simplified and the wavelength converter can be conveniently disposed in the accommodating space213of the fixing component21. For instance, opposite acting forces may be applied to end portions of the first housing211and the second housing212closer to the accommodating space213, respectively, so as to increase the distance between the first housing and the second housing; subsequently, the wavelength conversion component may be placed into the accommodating space213between the first housing and the second housing; and finally, the end portions of the first housing211and the second housing212may be connected by a connecting part218(as illustrated inFIG. 3b), so that the wavelength conversion component can be fixed between the first housing211and the second housing212.

For instance, as illustrated inFIG. 3c, the connecting part218may be provided with a positioning hole218a; and the connecting part218may be fixed with the housing (FIG. 3cillustrates the second housing212by way of example) included in the fixing component21by arrangement of a structure such as a bolt or a positioning pin in the positioning hole218a. Of course, the means for fixing the connecting part218and the housing includes but not limited to those illustrated inFIG. 3c.

At least one embodiment of the present disclosure further provides a display device including the backlight provided by any foregoing embodiments.

For instance, as illustrated inFIG. 4, the display device provided by at least one embodiment of the present disclosure includes a display panel61disposed on the backlight (not illustrated inFIG. 4). In the display process, the backlight provides backlight for the display panel61. For instance, the display panel61may be a LCD panel or a passive display panel.

For instance, the display device provided by at least one embodiment of the present disclosure may further include a front frame65to fix the backlight with the display panel61. Of course, the display device may further include other common structures. No further description will be given herein.

For instance, the display device provided by the embodiment of the present disclosure may be any product or component with display function such as a mobile phone, a tablet PC, a TV, a display, a notebook computer, a digital picture frame and a navigator.

At least one embodiment of the present disclosure further provides an assembly method of a backlight. Taking the backlight illustrated inFIG. 1as an example, the method provided by the embodiment of the present disclosure includes: as illustrated inFIG. 5a, arranging a wavelength converter20on a light-emitting side of a light source10, in which the wavelength converter20is configured to convert light with a first wavelength into light with a second wavelength when the light passing through the wavelength converter20, and the second wavelength is different from the first wavelength; and as illustrated inFIG. 5b, arranging a LGP30on one side of the wavelength converter20away from the light source10, so that the LGP30is disposed within an irradiation range of light emitted from the wavelength converter20.

It should be noted that the light emitted from the wavelength converter20may be the light with the second wavelength; of course, the light emitted from the wavelength converter20may also be light obtained by processing the light with the second wavelength via other optical elements in the wavelength converter.

For instance, in the assembly method provided by at least one embodiment of the present disclosure, before arranging the wavelength converter20on the light-emitting side of the light source10, the light source10may also be connected with a heat sink40(as illustrated inFIG. 5a). The connection between the light source10and the heat sink40may refer to the above relevant description. No further description will be given herein.

For instance, as illustrated inFIG. 5c, the assembly method provided by at least one embodiment of the present disclosure may further include: after arranging the LGP30, placing a rubber frame50on the light source10, the wavelength converter20and the LGP30, so as to fix relative positions of the light source10, the wavelength converter20and the LGP30. For instance, as illustrated inFIG. 5c, the rubber frame50includes a baffle51and a positioning structure52; the baffle51is disposed on one side of the light source10away from the wavelength converter20; and the positioning structure52includes a projection54so as to limit the position of the wavelength converter20. For instance, a lower surface52aof the positioning structure52may also limit the position of the wavelength converter20. Of course, the positioning structure52of the rubber frame50may be further provided with other projections (not illustrated inFIG. 5c), so as to limit the position of the light source10and/or the heat sink40.

For instance, as illustrated inFIG. 1, the wavelength converter20may include a fixing component21and a wavelength conversion component22. As illustrated inFIG. 6a, the fixing component21includes a first housing211and a second housing212. The first housing211and the second housing212are arranged opposite to each other to form an accommodating space213. In this case, the assembly method of the wavelength converter20may include: as illustrated inFIG. 6a, applying opposite acting forces (as illustrated by arrows inFIG. 6a) to end portions211aand212aof the first housing211and the second housing212, respectively, so as to form a gap210cbetween the first housing211and the second housing212; and as illustrated inFIG. 6b, placing the wavelength converter20into the accommodating space213of the fixing component21through the gap (not illustrated inFIG. 6b).

Of course, the wavelength converter20may also be assembled by adopting other assembly methods. For instance, as illustrated inFIG. 7, the wavelength conversion component22may be pushed into the accommodating space213of the fixing component21along the extension direction of the fixing component21.

The foregoing embodiments of the backlight, the assembly method thereof and the display device may refer to each other. In addition, the embodiments of the present disclosure and the characteristics described therein may be mutually combined, unless conflicted.

In summary, firstly, in the embodiments of the present disclosure, the wavelength converter is disposed between the light source and the LGP of the backlight, so that the color gamut of the display device can be increased; secondly, by adoption of the edge-lit structure, the embodiment of the present disclosure has the advantages of simpler structure and convenient assembly; thirdly, the design of the structures such as the fixing component, the heat sink and the rubber frame of the wavelength converter can improve the mechanical performance of the backlight provided by the embodiment of the present disclosure; and fourthly, in some embodiments, the reflection cavity is formed by the fixing component of the wavelength converter, so the optical coupling property of the wavelength converter can be improved.

Obviously, various modifications and deformations can be made to the present disclosure by those skilled in the art without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is intended to include the modifications and deformations fallen within the scope of the appended claims and equivalents thereof.

The present application claims the benefits of Chinese patent application No. 201610326436.9 filed with the SIPO on May 17, 2016, which is incorporated herein by reference as part of the application.