CN110031928B - Backlight source and display panel - Google Patents

Abstract

The invention provides a backlight source and a display panel. The backlight source comprises a light guide plate, a light source and a reflective film, the light guide plate is provided with a light-emitting surface, a light-entering side and a backlight side which are opposite, and the light-emitting surface of the light guide plate is provided with a through hole; the light source is arranged on the light incident side of the light guide plate; the reflecting film is arranged on the backlight side and used for reflecting light to the incident light side, and the through hole is positioned in the reflecting area of the reflecting film. The backlight source provided by the invention reflects the received incident light to the light incident side through the reflecting film, so that light compensation is carried out on a dark area, the whole light guide plate emits light uniformly, and the display effect is improved.

Description

Backlight source and display panel

Technical Field

The invention relates to the technical field of display, in particular to a backlight source and a display panel.

Background

The backlight source is a light source located at the back of the liquid crystal display, and the uniformity of the light emission directly affects the visual effect of the liquid crystal display module.

In fields such as machine vision, for cooperation installation camera or camera lens, need punch on conventional backlight, to unilateral income formula backlight, can keep away from light source one side at the trompil and form the dark space, lead to the light guide plate light-emitting inhomogeneous, influence display effect.

It is to be noted that the information invented in the above background section is only for enhancing the understanding of the background of the present invention, and therefore, may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a backlight source and a display panel, and solves the problem of uneven light emission of the conventional backlight source.

According to one aspect of the invention, there is provided a backlight comprising:

the light guide plate is provided with a light emitting surface, a light incident side and a backlight side which are opposite to each other, and the light emitting surface of the light guide plate is provided with a through hole;

the light source is arranged on the light incidence side of the light guide plate;

the light reflecting film is arranged on the backlight side and used for reflecting light to the light incident side, and the through hole is positioned in the reflection area of the light reflecting film.

In an exemplary embodiment of the present application, the backlight further includes:

the rubber frame is arranged on the periphery of the light guide plate in a surrounding mode, a concave surface which is concave towards the direction far away from the light source is arranged on the surface, right opposite to the backlight side, of the rubber frame, and the concave surface is covered with the reflective film.

In an exemplary embodiment of the present application, the concave surface is an arc-shaped concave surface, and a projection of the through hole on the backlight side is located inside a projection of the concave surface on the backlight side.

In an exemplary embodiment of the present application, the backlight side is provided with a protruding portion protruding in a direction away from the light source, and the reflective film covers a side wall of the protruding portion away from the light source.

In an exemplary embodiment of the present application, the protrusion has an arc-shaped outer wall, and a projection of the through hole on the backlight side is located inward of a projection of the protrusion on the backlight side.

In an exemplary embodiment of the present application, the backlight further includes:

the rubber frame is arranged around the periphery of the light guide plate, and the surface of the rubber frame corresponding to the protruding portion is provided with a concave surface matched with the protruding portion.

In an exemplary embodiment of the present application, the light reflecting material of the light reflecting film is silver.

In an exemplary embodiment of the present application, a height of the concave surface is equal to a thickness of the light guide plate in a cross section perpendicular to a plane of the light guide plate.

In an exemplary embodiment of the present application, in a cross section perpendicular to the plane of the light guide plate, the concave surface penetrates through the upper surface and the lower surface of the rubber frame, and the backlight further includes:

and the shading sheet is arranged on the surface of the rubber frame and covers the part of the rubber frame with the concave surface in the direction vertical to the plane of the light guide plate.

According to an aspect of the present application, there is provided a display panel including the backlight of any one of the above.

According to the backlight source, the reflecting film is arranged on the backlight side of the light guide plate, and the received incident light is reflected to the light incident side by the reflecting film, so that light compensation is performed on a dark area formed by the through holes, the whole light guide plate emits light uniformly, and the display effect is improved. And the backlight source of this structure simple structure need not to set up two side light sources, the cost is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic diagram of a conventional backlight structure;

FIG. 2 is a schematic structural diagram of a first embodiment of a backlight according to the present application;

FIG. 3 is a schematic structural view of the rubber frame in the AA-oriented cross section of FIG. 2;

FIG. 4 is another structural diagram of the rubber frame in the AA-oriented section of FIG. 2;

FIG. 5 is a schematic structural diagram of a second backlight embodiment of the present application;

fig. 6 is a schematic view of a backlight structure covering a light-shielding sheet.

In the figure: 1. a light guide plate; 2. a light source; 3. a rubber frame; 4. a light-reflecting film; 5. a through hole; 6. a shading sheet; 11. a light incident side; 12. a backlight side; 13. convex part, 31, concave surface.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Referring to fig. 1, for the single-sided light-in type backlight source with an opening, since the opening may damage the optical path transmission path, a dark area may be formed on one side of the opening away from the light source, and the light-emitting from the light guide plate is not uniform, which affects the display effect. If the light source is added on the opposite side of the existing light source, the problem of dark space can be solved, but the double-side light source has high cost and complex structure, and is not suitable for most displays.

Referring to fig. 1, the backlight according to the embodiment of the present invention is a single-side-in type backlight, and at least includes a light guide plate 1, a light source 2, a rubber frame 3, and a reflective film 4, where the light guide plate has a light emitting surface, and an incident light side and an emergent light side opposite to each other, and the light emitting surface of the light guide plate further has a through hole 5. The light source 2 is disposed on the light incident side 11 of the light guide plate 1. The reflective film 4 is disposed on the backlight side 12 for reflecting light toward the light incident side 11, and the through hole 5 is disposed in the reflective area of the reflective film.

The light guide plate 1 is the printing opacity material, and the incident light passes through the light guide plate 1 and reaches the reflective film 4 that 12 settings in a poor light side, and reflective film 4 reflects the incident light of receiving to income light side 11, and its reflection zone covers through-hole 5, therefore the reflection zone also can cover the dark space that exists because of through-hole 5 to the light compensation is carried out to the dark space to the reverberation, makes whole light guide plate 1 light-emitting even, thereby improves display effect.

The backlight of the embodiment of the present invention will be described in detail below:

example one

In the present embodiment, referring to fig. 1 and 2, the light source 2 is located on the right side of the light guide plate 1, and the incident light is irradiated from right to left, forming a dark area on the left side of the through hole 5. The backlight source further comprises a rubber frame 3, and the rubber frame 3 is arranged around the periphery of the light guide plate 1. The surface of the rubber frame 3 opposite to the backlight side 12 is provided with a concave surface 31 which is concave towards the direction far away from the light source 2, namely the concave surface 31 is arranged on the rubber frame 3 at the left side of the dark space and is positioned on the same incident light path with the through hole 5, and a gap is formed between the concave surface 31 and the light guide plate 1 of the rubber frame 3. The concave surface 31 is covered with a reflective film 4. The incident light passes through light guide plate 1 and reaches reflective membrane 4, and concave reflective membrane 4 changes the incident light and reverses, reflects the incident light to the left dark space of through-hole 5, carries out light compensation to the dark space, makes whole light guide plate 1 light-emitting even. It can be understood by those skilled in the art that the light source 2 may be located on any side of the light guide plate 1, and correspondingly, a dark area may exist on any side of the through hole 5, and therefore, the concave surface 31 of the glue frame 3 may be disposed according to the location of the dark area, and the specific location is not limited in the present application.

The plastic frame 3 is used for fixing the light guide plate 1 and other optical film materials, and is usually made of plastic, the concave surface 31 on the plastic frame 3 can be formed by one-time injection molding in plastic injection molding, and part of the plastic material can be removed by a mechanical method (such as cutting) at a later stage to form the concave surface 31.

In this embodiment, the concave surface 31 is an arc-shaped concave surface, the radian extends along the length direction of the rubber frame, and the projection of the through hole 5 on the backlight side 12 is located within the projection of the concave surface 31 on the backlight side 12, that is, the distance between the two ends of the arc is greater than the diameter of the through hole 5, so that the light reaching the two ends of the concave surface 31 of the reflective film from right to left can be reflected to the dark space on the left side of the through hole 5, thereby realizing light compensation in the dark space. The arc concave 31 is convenient to prepare and even in reflection. Those skilled in the art know that the radian and the length of the arc-shaped concave surface are determined according to the area and the position of the dark area, as long as the reflective film can uniformly compensate the light in the dark area. Those skilled in the art will also appreciate that the concave surface 31 may have other shapes, such as a plurality of flat surfaces, or the concave surface 31 may include only the upper and lower portions of the concave surface of the present embodiment, and the dark area light compensation may also be implemented, which is not listed here.

As shown in fig. 3, on the cross section perpendicular to the plane of the light guide plate 1, the concave surface 31 of the rubber frame 3 can penetrate through the upper and lower surfaces of the rubber frame 3, which is convenient for processing the rubber frame 3. At this time, a gap is formed between the rubber frame 3 and the light guide plate 1, and in order to block the gap, the upper surface and the lower surface of the rubber frame 3 may be covered with the light shielding sheet 6, that is, the light shielding sheet 6 is covered on a portion of the rubber frame 3 having the concave surface 31, as shown in fig. 6. The specific material of the light-shielding sheet 6 may be a light-shielding tape (black glue), and the light-shielding tape may be separately covered at the gap of the rubber frame 3, or may be covered when the light-shielding tape is adhered to another structure of the backlight.

As shown in fig. 4, the height of the concave surface 31 is equal to the thickness of the light guide plate 1 in a cross section perpendicular to the plane of the light guide plate 1. Specifically, the plastic frame 3 is required to fix the backlight source, and also to fix other optical film layers, back plates, and other structures disposed on the upper and lower surfaces of the light guide plate 1, so that the thickness of the plastic frame is usually slightly larger than the thickness of the light guide plate 1, the height of the concave surface 31 is controlled to be equal to the thickness of the light guide plate 1, and the plastic frame 3 does not need to penetrate through the upper and lower surfaces of the plastic frame 3, thereby ensuring the mechanical strength of the plastic frame 3 as much as possible. Meanwhile, the reflective film 4 is arranged in the concave surface 31, and can play a role in reflecting light and realize dark space compensation.

Example two

In another exemplary embodiment, referring to fig. 5, the light source 2 is located at the right side of the light guide plate 1, and the incident light is irradiated from right to left, forming a dark region at the left side of the through hole 5. The backlight side 12 is provided with a projection 13 projecting away from the light source 2, the projection 13 being located on the same incident light path as the through-hole 5 and on the left side of the through-hole 5. The reflective film 4 covers the side wall of the projection 13 away from the light source 2, i.e. the left side wall in the figure. The incident light reaches the reflective film 4 from right to left, the reflective film 4 changes the direction of the incident light, the incident light is reflected to the dark space on the left side of the through hole 5, and light compensation is carried out on the dark space, so that the whole light guide plate 1 emits light uniformly. It can be understood by those skilled in the art that the light source 2 may be located on any side of the light guide plate 1, and correspondingly, a dark area may exist on any side of the through hole 5, and therefore, the protrusion 13 of the light guide plate 1 may be disposed according to the location of the dark area, and the present application does not limit the specific location thereof.

The protruding portion of the light guide plate can be formed by one-time injection molding in plastic injection molding of the light guide plate, or a square light guide plate can be formed by injection molding, and then the light guide plate structure with the protruding portion 13 is formed by a mechanical mode (such as cutting and grinding).

In this embodiment, the side wall of the protruding portion 13 away from the light source 2 is an arc-shaped outer wall, that is, the reflective film is also arc-shaped, and the arc extends along the length direction of the backlight side 12, and the projection of the through hole 5 on the backlight side 12 is located within the projection of the protruding portion 13 on the backlight side 12, that is, the distance between the two ends of the arc of the protruding portion 13 is greater than the diameter of the through hole 5. Therefore, the light reaching the two ends of the arc-shaped reflecting film from right to left can be reflected to the dark area on the left side of the through hole 5, and the light compensation of the dark area is realized. As known to those skilled in the art, the radian and the length of the arc-shaped outer wall are determined according to the area and the position of the dark area, as long as the reflective film can uniformly compensate the light in the dark area. Those skilled in the art will also understand that the protrusion 13 may have other shapes, for example, the outer wall of the protrusion 13 is formed by splicing a plurality of planes, or the protrusion 13 only includes the upper and lower portions of the protrusion of the present embodiment, and the dark area light compensation can also be achieved, which is not listed here.

In this embodiment, the backlight further includes a rubber frame 3, the rubber frame 3 is disposed around the periphery of the light guide plate 1, and a concave surface 31 matched with the protruding portion 13 is disposed on a surface of the rubber frame 3 corresponding to the protruding portion 13, so that the light guide plate 1 can be fixed.

Similar to the rubber frame structure in the first embodiment of fig. 3, on the cross section perpendicular to the plane of the light guide plate 1, the concave surface 31 of the rubber frame 3 can penetrate through the upper and lower surfaces of the rubber frame 3, at this time, the light-emitting surface of the backlight source is more than the conventional square light-emitting surface by one corresponding protrusion 13, in order to block the light in this area, the upper surface and the lower surface of the rubber frame 3 can be covered with the light-shielding sheet 6, as shown in fig. 6, that is, the light-shielding sheet 6 is covered on the portion of the rubber frame 3 having the concave surface 31, that is, the protrusion 13 is blocked, so that the light emitted by the backlight source is ensured to be square.

Similar to the rubber frame structure of the first embodiment in fig. 4, the height of the concave surface 31 is equal to the height of the convex portion 13 (i.e., the thickness of the light guide plate 1) in the cross section perpendicular to the plane of the light guide plate 1. As in the above embodiment, since the thickness of the rubber frame 3 is usually slightly greater than the thickness of the light guide plate 1, and the height of the concave surface 31 is controlled to be equal to the thickness of the light guide plate 1, it is not necessary to penetrate the upper and lower surfaces of the rubber frame 3, which can ensure the mechanical strength of the rubber frame 3, and also can ensure that the surface of the rubber frame 3 can cover the protruding portion 13 of the light guide plate 1, thereby ensuring that the light emitted from the backlight source is square.

In the above embodiment, the material of the reflective film 4 may be a metal reflective material, such as nano silver. The reflective film can be formed by forming a metal reflective layer on the film material, and then fixed on the concave surface 31 of the plastic frame or the convex portion 13 of the light guide plate by means of pasting, or formed by spraying or coating directly on the concave surface 31 of the plastic frame or the convex portion 13 of the light guide plate. The present invention is not limited to a specific process of the reflective film.

In addition, in the above embodiments, the backlight source may further include other structures such as a reflection sheet, a brightness enhancement sheet, a diffusion sheet, and a back plate, which are not described herein again.

The embodiment of the invention also provides a display panel which comprises the backlight source of the embodiment. The display panel is a liquid crystal display panel, can be used in various display devices such as mobile phones, notebook computers, tablet computers, electronic books, billboards, GPS, solar cells and the like, and can improve the display quality of the display panel.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims (6)

1. A backlight, comprising:

the light guide plate is provided with a light emitting surface, a light incident side and a backlight side which are opposite to each other, and the light emitting surface of the light guide plate is provided with a through hole;

the light source is arranged on the light incidence side of the light guide plate;

the light reflecting film is used for reflecting light to the light incident side, and the through hole is positioned in a reflecting area of the light reflecting film;

the rubber frame is arranged around the periphery of the light guide plate in a surrounding manner;

the surface of the rubber frame opposite to the backlight side is provided with an arc-shaped concave surface which is concave towards the direction far away from the light source, the concave surface is covered by the reflective film, and the projection of the through hole on the backlight side is positioned within the projection of the concave surface on the backlight side; or, the side of being shaded is equipped with to keeping away from the convex bulge of light source direction, the lateral wall that the light source direction was kept away from to the bulge is the arc outer wall, the reflective membrane cover in the bulge is kept away from the arc outer wall of light source direction, the through-hole is in the projection that the side was shaded is located the bulge is in within the projection of the side of being shaded.

2. The backlight source of claim 1, wherein when the backlight side is provided with a protrusion protruding away from the light source, a surface of the rubber frame corresponding to the protrusion has a concave surface engaged with the protrusion.

3. The backlight of claim 1, wherein the light reflecting material of the light reflecting film is silver.

4. The backlight of claim 1 or 2, wherein the height of the concave surface is equal to the thickness of the light guide plate in a cross-section perpendicular to the plane of the light guide plate.

5. The backlight source of claim 1 or 2, wherein the concave surface penetrates through the upper surface and the lower surface of the rubber frame in a cross section perpendicular to the plane of the light guide plate, and the backlight source further comprises:

and the shading sheet is arranged on the surface of the rubber frame and covers the part of the rubber frame with the concave surface in the direction vertical to the plane of the light guide plate.

6. A display panel comprising the backlight according to any one of claims 1 to 5.

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