CN111103730A

CN111103730A - Backlight module, display panel and display device thereof

Info

Publication number: CN111103730A
Application number: CN201911307414.8A
Authority: CN
Inventors: 左小艳
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-05-05

Abstract

The invention provides a backlight module, a display panel and a display device thereof. The backlight module includes: circuit board and at least two LED lamps. Through the mode with the size increase of the light emitting area of the LED lamp among the backlight unit, under the condition that does not change the position of the LED lamp on the circuit board, reduce the interval between the light emitting area of two adjacent LED lamps to avoid backlight unit to appear the uneven problem of transmitted light shade, improve backlight unit's demonstration homogeneity, and then promote customer experience and feel.

Description

Backlight module, display panel and display device thereof

Technical Field

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

Background

With the development of liquid crystal display technology, the application field of liquid crystal displays, especially color liquid crystal displays, is also widening. Pulled by the market of liquid crystal displays and the backlight industry, the liquid crystal display displays a splendid scene. Liquid crystal displays are passive light emitting elements and the display screen itself does not emit light but is illuminated by a backlight below it. The backlight source and the liquid crystal display screen are combined together to form the liquid crystal display module.

The so-called backlight (Back Light) is a Light source located behind a Liquid Crystal Display (LCD), and its lighting effect will directly affect the visual effect of the liquid crystal display module (LCM). The backlight source has the characteristics of high brightness, long service life, uniform light emission and the like. The backlight source is divided into a direct type backlight source and an edge type backlight source according to the distribution position of the light source.

In the direct type backlight, a light source (an LED chip array) and a printed circuit board are disposed at the bottom of the backlight, and light is emitted from the LEDs, passes through a reflector at the bottom, and then uniformly emitted through a diffuser plate and a brightness enhancement film on the surface.

The edge-lit backlight is a backlight in which linear or point-like light sources are arranged on the side of a specially designed light guide plate. The light guide plate principle is to utilize the interference phenomenon that the distribution of the mesh points at the bottom of the light guide acrylic plate destroys light, and to uniformly convert a linear light source into a surface light source, and the light guide plate has the function of guiding the scattering direction of light, so that the light distribution is more uniform, the shadow of a reflection point cannot be seen from the front, the brightness of the panel is improved, the uniformity of the brightness of the panel is ensured, and the excellent light guide plate has great influence on backlight.

With the development of display technology and the increasing demand of user experience, people's demand for full-screen is also coming. Along with the development of comprehensive screen technique, the frame of screen is also more and more narrow, and the problem that brings along therewith is that, the clearance between the light emitting area of two adjacent LED lamps is bigger than normal, and the light that leads to clearance department between two adjacent LEDs is darker, has the uneven problem of emission light dark and dark among the whole backlight unit, seriously influences customer experience. Therefore, a new backlight module is needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a backlight module which can solve the problem of uneven brightness of emitted light in the existing backlight module, improve the display effect and improve the experience of customers.

In order to solve the above problems, the present invention provides a backlight module, which includes: circuit board and at least two LED lamps. The circuit board comprises at least two welding pads which are arranged in a column; the LED lamp all includes: the base is welded to a bonding pad of the circuit board; and the length of the light-emitting surface in the pad arrangement direction is greater than that of the base in the pad arrangement direction.

Furthermore, the backlight module further comprises a light guide plate which is arranged on one side of the LED lamp far away from the circuit board.

Further, wherein the backlight module further comprises a frame body, which includes: the first frame body is arranged on the surface of one side, away from the LED lamp, of the circuit board; a second frame body vertically connected to one side surface of the first frame body; and a third frame body vertically connected to the other side surface of the first frame body.

Further, the backlight module further comprises: a reflective sheet disposed between the second frame and the light guide plate; and the optical film is arranged on the surface of the light guide plate far away from the second frame body.

Further wherein the optical film comprises: the lower diffusion sheet is arranged on the light guide plate; the prism sheet is arranged on the lower diffusion sheet; and the upper diffusion sheet is arranged on the prism sheet.

Further, the length of the luminous surface in the arrangement direction of the bonding pads ranges from 18 mm to 36 mm.

Furthermore, the length of an intersection line of a longitudinal section of the LED lamp and the light-emitting surface is greater than or equal to the length of an intersection line of the longitudinal section of the LED lamp and the light-emitting surface, and the longitudinal section is perpendicular to the arrangement direction of the bonding pads.

An object of the present invention is to provide a display panel, which can solve the problem of uneven brightness of emitted light in a backlight module of the current display panel, and improve the experience of customers.

In order to solve the above problems, the present invention provides a display panel including the backlight module according to the present invention.

An object of the present invention is to provide a display device, which can solve the problem of uneven brightness of emitted light in a backlight module of a display panel of the current display device, and improve the experience of customers.

In order to solve the above problem, the present invention provides a display device including the display panel according to the present invention.

Further, the display device comprises one or more of a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame and a navigator.

The invention has the advantages that: the invention provides a backlight module, a display panel and a display device thereof. Through the mode with the size increase of the light emitting area of the LED lamp among the backlight unit, under the condition that does not change the position of the LED lamp on the circuit board, reduce the interval between the light emitting area of two adjacent LED lamps to avoid backlight unit to appear the uneven problem of transmitted light shade, improve backlight unit's demonstration homogeneity, and then promote customer experience and feel.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backlight module according to the present invention.

Fig. 2 is a sectional view taken along line a-a in fig. 1.

The components in the figure are identified as follows:

100. display module

1. Circuit board 2, LED lamp

3. Light guide plate 4 and frame body

5. Reflector 6 and optical film

7. Adhesive tape

21. Base 22, light emitting surface

41. First frame 42 and second frame

43. Third frame body

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to make and use the present invention in a complete manner, and is provided for illustration of the technical disclosure of the present invention so that the technical disclosure of the present invention will be more clearly understood and appreciated by those skilled in the art how to implement the present invention. The present invention may, however, be embodied in many different forms of embodiment, and the scope of the present invention should not be construed as limited to the embodiment set forth herein, but rather construed as being limited only by the following description of the embodiment.

The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are used for explaining and explaining the present invention, but not for limiting the scope of the present invention.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. In addition, the size and thickness of each component shown in the drawings are arbitrarily illustrated for convenience of understanding and description, and the present invention is not limited to the size and thickness of each component.

When certain components are described as being "on" another component, the component can be directly on the other component; there may also be an intermediate component disposed on the intermediate component and the intermediate component disposed on another component. When an element is referred to as being "mounted to" or "connected to" another element, they are directly "mounted to" or "connected to" the other element or "mounted to" or "connected to" the other element through an intermediate element.

Examples

The present embodiment provides a display device, which includes a display panel including a backlight module 100. The display device is a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame or a navigator.

As shown in fig. 1, the backlight module 100 includes a circuit board 1, at least two LED lamps 2, a light guide plate 3, a frame 4, a reflective sheet 5, and an optical film 6.

As shown in fig. 1, the wiring board 1 includes at least two pads arranged in a line. Each LED lamp 2 includes: a base 21 and a light-emitting surface 22. Wherein, the base 21 is provided with a welding foot which is correspondingly welded on a welding disc of the circuit board 1, thereby realizing the electric connection of the LED lamp 2 and the circuit board 1. The base 21 and the light-emitting surface 22 are both parallelogram, preferably, the base 21 and the light-emitting surface 22 are both rectangle, and the projection of the central point of the base 21 on the light-emitting surface 22 and the central point of the light-emitting surface 22 are coincident with each other.

As shown in fig. 1 and 2, the light-emitting surface 22 is a surface of the LED lamp facing the light guide plate 3. The length of the light emitting surface 22 in the pad arrangement direction is larger than the length of the submount in the pad arrangement direction. Therefore, the distance between the light emitting surfaces 22 of the two adjacent LED lamps 2 is reduced under the condition that the positions of the LED lamps 2 on the circuit board 1 are not changed, so that the problem that the light and shade of the emitted light of the backlight module 100 are uneven is avoided, the display uniformity of the backlight module 100 is improved, and the user experience is improved.

The annular light emitting area that can have certain luminance around the light emitting area 22 of LED lamp 2, among the prior art, the interval between the light emitting area 22 of two adjacent LED lamps 2 is great, and the annular light emitting area of two light emitting areas does not have an intersection, has the shadow district that two light emitting areas all can't cover in the clearance between two light emitting areas 22, leads to obviously slightly dark between two LED lamps for backlight unit 100 appears the uneven problem of transmitted light shade.

This embodiment is through reducing the interval between the light emitting surface 22 of two adjacent LED lamps 2 for clearance between the light emitting surface 22 of two adjacent LED lamps 2 is all covered by the light emitting area around the light emitting surface 22 of two adjacent LED lamps 2, thereby makes the luminance in clearance between the light emitting surface 22 of two adjacent LED lamps 2 obviously promote, does not have the shadow district, finally improves backlight unit 100's display effect, improves backlight unit 100's demonstration homogeneity, and then promotes the customer experience and feels.

The length of the light emitting face 22 in the pad arrangement direction is in the range of 18 to 36 mm. Preferably 22mm, 26mm or 30 mm.

As shown in fig. 1 and 2, the width of the light-emitting surface 22 in the present embodiment in the direction perpendicular to the pad arrangement direction is larger than the width of the base 21 in the direction perpendicular to the pad arrangement direction. In practical operation, the width of the light-emitting surface 22 in the direction perpendicular to the pad arrangement direction may also be equal to the width of the base 21 in the direction perpendicular to the pad arrangement direction, according to specific requirements.

The light guide plate 3 is disposed on one side of the LED lamp 2 away from the circuit board 1. The light guide plate 3 is generally made of acrylic plastic with high transmittance, and the surface is very smooth, so most of the internal light will be regularly reflected on the flat surface thereof, and will not be emitted to the outside of the light guide plate 3. Thereby converting the light emitted from the LED lamp 2 at the side of the light guide plate 3 into a surface light source to be incident on the optical film 6 on the light guide plate 3.

The housing 4 includes a first housing 41, a second housing 42, and a third housing 43. The first frame body 41 is arranged on the surface of one side of the circuit board 1 far away from the LED lamp 2; the second frame 42 is vertically connected to one side surface of the first frame 41; the third frame 43 is vertically connected to the other side surface of the first frame 41. The frame 4 is mainly used to protect the components of the backlight module 100, such as the circuit board 1, the LED lamp 2, and the light guide plate 3.

The reflective sheet 5 is disposed between the second frame 42 and the light guide plate 3, and is mainly used for reflecting the light exposed from the bottom of the light guide plate 3 back to the light guide plate 3, so as to improve the availability of the light.

The optical film 6 is disposed on a surface of the light guide plate 3 away from the second frame 42. Wherein the optical film 6 includes: a lower diffusion sheet, a prism sheet, and an upper diffusion sheet. The lower diffusion sheet is arranged on the surface of the light guide plate 3 far away from the second frame body 42; the prism sheet is arranged on the lower diffusion sheet; the upper diffusion sheet is arranged on the prism sheet. The lower diffusion sheet and the upper diffusion sheet can diffuse the light received by the light guide plate 3, and the prism sheet can concentrate the diffused light to emit within a certain angle, so as to achieve the purpose of improving the brightness of the display panel.

As shown in fig. 1, the backlight module 100 further includes an adhesive tape 7. The adhesive tape 7 is provided on the third frame 43 and the optical film 6. The adhesive tape 7 is mainly used to prevent the light leakage phenomenon at the gap between the third frame 43 and the optical film 6 in the backlight module 100.

The backlight module, the display panel and the display device thereof provided by the embodiment of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A backlight module, comprising:

a circuit board including at least two pads arranged in a line; and

at least two LED lamps, the LED lamp all includes:

the base is welded to a bonding pad of the circuit board; and

and the length of the light-emitting surface in the pad arrangement direction is greater than that of the base in the pad arrangement direction.

2. The backlight module of claim 1, further comprising:

and the light guide plate is arranged on one side of the LED lamp, which is far away from the circuit board.

3. The backlight module of claim 2, further comprising:

a frame body, comprising:

the first frame body is arranged on the surface of one side, away from the LED lamp, of the circuit board;

a second frame body vertically connected to one side surface of the first frame body; and

and the third frame body is vertically connected to the other side surface of the first frame body.

4. A backlight module according to claim 3, further comprising:

a reflective sheet disposed between the second frame and the light guide plate; and

and the optical film is arranged on the surface of the light guide plate far away from the second frame body.

5. The backlight module according to claim 4, wherein the optical film comprises:

the lower diffusion sheet is arranged on the light guide plate;

the prism sheet is arranged on the lower diffusion sheet; and

and the upper diffusion sheet is arranged on the prism sheet.

6. A backlight module according to claim 1, wherein the length of the light emitting face in the direction of the arrangement of the pads is in the range of 18-36 mm.

7. The backlight module as claimed in claim 1, wherein the length of the intersection line of a longitudinal section of the LED lamp and the light emitting surface is greater than or equal to the length of the intersection line of the longitudinal section of the LED lamp and the base, and the longitudinal section is perpendicular to the arrangement direction of the pads.

8. A display panel comprising the backlight module of any one of claims 1-7.

9. A display device comprising the display panel of claim 8.

10. The display device according to claim 9, comprising one or more of a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, and a navigator.