CN114527600B - Backlight module and display panel with same - Google Patents

Backlight module and display panel with same Download PDF

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Publication number
CN114527600B
CN114527600B CN202210204457.9A CN202210204457A CN114527600B CN 114527600 B CN114527600 B CN 114527600B CN 202210204457 A CN202210204457 A CN 202210204457A CN 114527600 B CN114527600 B CN 114527600B
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China
Prior art keywords
weirs
dam
light source
light
backlight module
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CN202210204457.9A
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Chinese (zh)
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CN114527600A (en
Inventor
杨勇
刘凡成
查国伟
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means

Abstract

The invention provides a backlight module and a display panel with the backlight module, wherein the backlight module comprises a box dam structure, the box dam structure comprises a plurality of first box dams, the first box dams are arranged on a substrate, and a plurality of mounting areas are formed by the first box dams at intervals; the light sources are arranged on the substrate, and each mounting area is internally provided with the light source, wherein the light quantity reflected by the first box dam positioned on one side of the light source in each mounting area is larger than the light quantity reflected by the first box dam positioned on the other side of the light source. The invention provides a backlight module, which is characterized in that a dam structure with a light control function is manufactured on the surface of the backlight module and is used for meeting the requirements of a special display screen on optical visual angles and brightness.

Description

Backlight module and display panel with same
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight module and a display panel having the backlight module.
Background
The Mini-LED (miniature light emitting diode, micro light emitting diode) technology has the advantages of high contrast, partition control, power saving and the like, and can be suitable for products with different sizes from mobile phones to televisions according to product specification requirements. The main framework of the Mini-LED backlight module comprises an FPC/PCB (FPC: flexible and Rigid-Flex flexible circuit board; PCB: printed Circuit Board, printed circuit board) substrate, an LED light-emitting chip and an LED packaging adhesive layer. In order to realize the high brightness and light emitting characteristics of the Mini-LED backlight, a reflecting layer structure needs to be manufactured on the substrate to improve the light returning efficiency of the chip light emission, and usually, the reflecting material commonly used on the substrate comprises white ink or a metal layer. However, due to the limitation of materials, the reflectivity of the white ink is generally not more than 90%, the light absorption is more than 10%, the reflection of the metal layer can reach more than 90%, but the metal reflection is usually mainly specular reflection, if the backlight module adopts a COB (chip on board) packaging mode, the light-emitting ray of the chip with a large angle can form a long-distance optical waveguide effect on the surfaces of the metal layer and the flattened packaging adhesive layer, which is also unfavorable for efficient light-emitting. For special designs of certain products, different condensing characteristics in the x/y direction are required, and asymmetric structural designs are required to meet the requirements. The development of specific asymmetric microstructures requires great cost and time, and is not profitable, so people are continuously trying to find a low-cost way to realize the asymmetric brightness enhancement structure design or method of the display.
Compared with Mini-LED backlight products, the LCD (liquid crystal display ) display products manufactured by the conventional backlight have the defect of low module brightness, and the two-dimensional directions of the brightness visual angle distribution have the characteristics of high central brightness and low peripheral brightness, however, for the display screens such as vehicle-mounted central control and the like, the display screens are required to be highlighted, and meanwhile, the backlight is required to emit light in a certain direction and have the highest brightness at a certain visual angle (non-positive visual angle), and for the requirements, only the asymmetric membrane can be developed to correspondingly solve at present. The method has high development cost, large light efficiency loss and non-optimal method.
Disclosure of Invention
The invention provides a backlight module, which is based on Mini-LED backlight, and a wall dam structure with a light control function is manufactured on the surface of a lamp panel of the backlight module, so that the requirements of the display screen on optical visual angles and brightness are met.
In order to solve the problems, the technical scheme provided by the invention is as follows:
a backlight module, comprising:
a substrate;
the dam structure comprises a plurality of first dams, wherein the first dams are arranged on the substrate, and a plurality of mounting areas are spaced apart from the first dams;
the light sources are arranged on the substrate, and each mounting area is internally provided with the light source, wherein the light quantity reflected by the first box dam positioned on one side of the light source in each mounting area is larger than the light quantity reflected by the first box dam positioned on the other side of the light source.
According to a preferred embodiment of the present invention, the light sources are disposed between two adjacent first weirs, each of the two adjacent first weirs is disposed with a light source, and a distance from one of the first weirs to the light source is greater than a distance from the other of the first weirs to the light source.
According to a preferred embodiment of the present invention, the dam structure further includes a plurality of second dams intersecting the plurality of first dams to form the installation area, the corresponding light source is disposed between two adjacent second dams, and the two adjacent second dams are disposed opposite to the light source, where the distances from the two adjacent second dams to the light source are equal.
According to a preferred embodiment of the present invention, the height of the second dam is:
h b ≥h 0 +y*cotβ
h b is the height of the second dam, h 0 And y is the distance between the light source and the second dam, and beta is the main light emitting angle of the chip in the vertical direction.
According to a preferred embodiment of the present invention, the width of the second dam is not more than 1/4 of the pitch of the light sources.
According to a preferred embodiment of the present invention, the height of the first dam is higher than the height of the light source.
According to a preferred embodiment of the present invention, the width of the first dam is required to satisfy:
2W b +X 1 +X 2 +X 0 ＝P
wherein W is b X is the width of the first dam 1 X is the distance between the first dam far from the light source and the light source in two adjacent first dams 2 The distance between the first surrounding dam which is close to the light source and the light source in the two adjacent first surrounding dams; p is the spacing of the light sources.
According to a preferred embodiment of the present invention, the light sources are disposed between two adjacent first weirs, and the height of one of the first weirs is higher than the height of the other first weirs.
According to a preferred embodiment of the present invention, the light sources are disposed between two adjacent first weirs, and the first weirs on one side of the light sources have higher reflectivity than the first weirs on the other side of the light sources.
The invention also provides a display panel, which comprises the backlight module.
The beneficial effects of the invention are as follows: the invention provides a backlight module, which is characterized in that a dam structure with a light control function is manufactured on the surface of the backlight module and is used for meeting the requirements of the display screen on optical visual angles and brightness.
Drawings
In order to more clearly illustrate the embodiments or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1a is a schematic diagram of a backlight module according to the present invention;
FIG. 1b is a schematic plan view of a lamp panel according to the present invention;
FIG. 2a is a schematic diagram showing a relative positional relationship between a first dam of a lamp panel and a light source according to the present invention;
FIG. 2b shows a relative positional relationship between a second dam of the lamp panel and a light source according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Although the terms "first," "second," "third," etc. may be used herein to describe various elements, these elements should not be limited by these terms.
The embodiment of the invention provides a display panel, which comprises a backlight module and a panel body. In this embodiment, the display panel is a liquid crystal display panel, and the panel main body may include two polarizers disposed opposite to each other, an array substrate and a color film substrate disposed between the two polarizers and disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the color film substrate.
The backlight module is used for emitting light, and the panel main body is used for realizing the control of permeation or non-permeation of the light through the deflection of liquid crystal molecules of the liquid crystal layer, so as to realize the display function of the display panel.
The backlight module, as shown in fig. 1a, comprises a back plate 1, a lamp panel 2 positioned on the back plate 1, a color conversion film 3 positioned on the lamp panel 2, a light homogenizing film 4 (or a diffusion sheet), a lower prism sheet 5, an upper prism sheet 6 and the like.
Aiming at the display products such as vehicles and the like which require that the brightness of the display screen has the characteristics of high brightness and asymmetric distribution in a certain direction, the invention is based on Mini-LED backlight, and a surrounding dam structure with a light control function is manufactured on the surface of the lamp panel 2, so that the requirements of the display screen on optical visual angles and brightness are met.
The lamp panel 2 in an embodiment of the invention comprises a box dam structure, a Base plate Base and a light source, wherein the box dam structure comprises a plurality of first box dams T1, the first box dams T1 are arranged on the Base plate Base, and a plurality of mounting areas are formed by the first box dams T1 at intervals;
the light sources are arranged on the Base plate Base, and the light sources are arranged in each mounting area, wherein the quantity of light reflected by the first box dam T1 positioned on one side of the light sources is larger than the quantity of light reflected by the first box dam T1 positioned on the other side of the light sources.
The light source in the embodiment of the invention can be a common light emitting device such as an LED chip, and the invention is described by taking the LED chip as an example.
Based on the above, the lamp panel 2 may be implemented by adopting the specific structure in the embodiment shown in fig. 1b, where the lamp panel 2 includes the dam structure, the substrate Base, and the light source, the dam structure includes a plurality of first dams T1 and a plurality of second dams T2, the plurality of second dams T2 and the plurality of first dams T1 are all disposed on the substrate Base, and the plurality of second dams T2 intersect the plurality of first dams T1 to form a plurality of mounting areas, and the cross-sectional shape of the mounting area includes polygons such as a rectangle, a trapezoid, and the cross-sectional shape of the mounting area is explained in this embodiment as a rectangle. And defining two adjacent sides of the mounting area, wherein the extending direction of one side is a first direction x, and the extending direction of the other side is a second direction y, and the first direction x is perpendicular to the second direction y. Here, with the extending direction of the first dam T1 as the second direction y and the extending direction of the second dam T2 as the first direction x, a plurality of first dams T1 are arranged along the first direction x and extend along the second direction y, and a plurality of second dams T2 are arranged along the second direction y and extend along the first direction x, where in this embodiment, each of the installation areas includes two first dams T1 disposed opposite to each other and two second dams T2 disposed opposite to each other.
In this embodiment, the LED chip is disposed on the substrate Base, and is electrically connected with the substrate Base, so as to drive the LED chip to emit light, and may specifically be connected by using a metal wire, so that, in order to ensure the light output, the dam structure individually packages the LED chip, that is, each mounting area is provided with one LED chip.
To achieve the above-mentioned requirement of the display screen for viewing angle, the two first weirs T1 of each mounting area may be set such that a distance from one of the first weirs T1 to the LED chip is greater than a distance from the other first weirs T1 to the LED chip, and the two second weirs T2 of each mounting area may be set such that distances from the LED chip are equal. Under the condition that the other parameters of the two first weirs T1 are consistent, the first weirs T1 closer to the LED chip can better reflect the large-angle light emitted by the LED chip, while the first weirs T1 farther from the LED chip cannot block and reflect the other large-angle light emitted by the LED chip, that is, the light emitted by the other large angle of the LED chip can be emitted beyond the weirs, therefore, the light quantity reflected by the first weirs T1 closer to the LED chip is higher than the light quantity reflected by the first weirs T1 farther from the LED chip, and under the condition that the other parameters of the two second weirs T2 are consistent, the light quantity reflected by the two second weirs T2 is equal. Thereby, the brightness of the LED chip at a certain visual angle in the first direction x is optimal. The above parameters are parameters affecting the amount of reflected light from the weirs, such as the height of the weirs, the width of the weirs, the distance from the weirs to the light source, the light reflectivity of the weirs, and the like.
In the above embodiment, as shown in fig. 2a, to better achieve the above object, the heights of the two first weirs T1 may be set, for example, the height of the first weirs T1 may be set to be higher than the height of the LED chip, specifically, H is set b1 To the height of the first dam T1, H 0 X is the height of the LED chip 1 X is the distance between the first dam T1 and the LED chip far away from the LED chip 2 For the distance between the first dam T1 and the LED chip, where α is a half-decay angle of the LED chip, θ is a chief ray angle of the LED chip, the height of the first dam T1 needs to satisfy: h b1 ≤H 0 +X 1 * cotθ, and the height of the first dam T1 also needs to satisfy H b1 ≥H 0 +X 2 *cotα。
In the above embodiment, the width of the first dam T1 needs to satisfy: 2W (2W) b +X 1 +X 2 +X 0 =p; wherein W is b For the width X of the first dam T1 1 X is the distance between the first dam T1 far away from the LED chip and the LED chip 2 A distance between the first dam T1 which is closer to the LED chip and the LED chip; and P is the distance between two LED chips, namely the distance between two adjacent LED chips in the first direction x.
Preferably, X 1 0.2-0.4mm, X 2 1-1.5mm, W b 0.1-2mm, H b1 Is 0.1-1mm.
As shown in FIG. 2b, in the above embodiment, the height of the second dam T2 is h b2 ≥h 0 +y_cotβ, where h b2 For the height of the second dam T2, h 0 And y is the distance between the LED chip and the second surrounding dam T2, beta is the main light emitting angle of the LED chip in the vertical direction, and the width of the second surrounding dam T2 is not more than 1/4P.
Preferably, the height h of the second dam T2 b2 The width of the second dam T2 is 0.3-0.4mm, and the width of the second dam T2 is 0.6-0.8mm.
In some embodiments, since the lower weirs more easily achieve differentiation of the light output, the height of the first weirs T1 is set smaller than the height of the second weirs T2 in order to more easily achieve the best luminance at a certain viewing angle in the first direction x. Meanwhile, since the high thixotropic material can achieve a larger height-width ratio, the first surrounding dam T1 comprises a low thixotropic material, and the second surrounding dam T2 comprises a high thixotropic material, which can be molded by a glue spraying process.
In order to meet the requirement of the display screen on the viewing angle, the two first weirs T1 of each installation area may be set such that the distance from one first weir T1 to the LED chip is greater than the distance from the other first weirs T1 to the LED chip, and the two second weirs T2 of each installation area may be set such that the distances from the two first weirs T1 to the LED chip are different. Specifically, the parameters of the second weirs T2 may be adjusted with reference to the above embodiments.
In order to meet the requirement of the display screen on the visual angle, the height of the surrounding dam can be adjusted. For example, in the case where the other parameters are identical, the height of one of the two first weirs T1 is set to be greater than the height of the other one of the two first weirs T1, and since the remaining parameters of the two first weirs T1 are identical, the higher first weirs T1 can reflect more light, and thus the luminance at a certain viewing angle in the first direction x can be realized. At this time, the parameters of the second dam T2 may be specifically set according to actual requirements and the above embodiments.
In order to achieve the above requirement of the display screen for the viewing angle, the reflection rate of the light by the first weirs T1 may be adjusted, for example, in the case that the other parameters are identical, the reflection rate of one of the two first weirs T1 is set to be greater than the reflection rate of the other one of the two first weirs T1, and since the other parameters of the two first weirs T1 are identical, the first weirs T1 with higher reflection rate can reflect more light, so that the brightness of a certain viewing angle in the first direction x may be optimized. Specifically, the reflection layers may be attached to the two first weirs T1, or the reflection rates may be different by changing the materials of the two first weirs T1.
In the above-described embodiment, the reflectivity of the adhesive material of the first and second weirs T1 and T2 to light is not lower than 95%.
In summary, although the present invention has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.

Claims (8)

1. A backlight module, comprising:
a substrate;
the dam structure comprises a plurality of first dams, wherein the first dams are arranged on the substrate, and a plurality of mounting areas are spaced apart from the first dams;
the light sources are arranged on the substrate, and the light sources are arranged in each installation area, wherein the light quantity reflected by the first box dam positioned at one side of the light sources in each installation area is larger than the light quantity reflected by the first box dam positioned at the other side of the light sources;
the first weirs are intersected with the first weirs to form a plurality of first weirs of the installation area, corresponding light sources are arranged between two adjacent first weirs, and the two adjacent first weirs are arranged opposite to the light sources, wherein the distances from the two adjacent first weirs to the light sources are equal;
the height of the second surrounding dam is as follows:
h b ≥h 0 +y*cotβ
h b h is the height of the second dam 0 And y is the distance between the light source and the second dam, and beta is the main light emitting angle of the light source in the vertical direction.
2. The backlight module according to claim 1, wherein the corresponding light source is disposed between two adjacent first weirs, each of the two adjacent first weirs is disposed with the light source, and a distance from one of the two adjacent first weirs to the light source is greater than a distance from the other of the two adjacent first weirs to the light source.
3. The backlight module according to claim 2, wherein the width of the second dam is not more than 1/4 of the light source pitch.
4. The backlight module of claim 1, wherein the height of the first dam is greater than the height of the light source.
5. The backlight module according to any one of claims 2 or 4, wherein the width of the first dam is required to satisfy:
2W b +X 1 +X 2 +X 0 ＝P
wherein W is b X is the width of the first dam 1 X is the distance between the first dam far from the light source and the light source in the two adjacent first dams 2 The distance between the first surrounding dam which is closer to the light source in the two adjacent first surrounding dams and the light source is the same; p is the distance between the light sources.
6. The backlight module according to claim 1, wherein the light source is disposed between two adjacent first weirs, and the height of one of the two adjacent first weirs is higher than the height of the other first weirs.
7. The backlight module according to claim 1, wherein the corresponding light source is disposed between two adjacent first weirs, and the first weirs on one side of the light source have a higher reflectivity than the first weirs on the other side of the light source.
8. A display panel comprising the backlight module of any one of claims 1 to 7.
CN202210204457.9A 2022-03-03 2022-03-03 Backlight module and display panel with same Active CN114527600B (en)

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CN114527600B true CN114527600B (en) 2023-05-02

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CN115728991B (en) * 2022-11-25 2024-04-05 厦门天马微电子有限公司 Backlight module and display device

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TWI312432B (en) * 2005-03-01 2009-07-21 Chi Mei Optoelectronics Corporatio Backlight module
TWI368792B (en) * 2007-11-09 2012-07-21 Au Optronics Corp Lcd device, backlight module, thereof, with partition wall and method for manufacturing the same
CN202835008U (en) * 2012-08-02 2013-03-27 青岛海信电器股份有限公司 Direct type backlight module
CN108445628B (en) * 2018-02-28 2020-05-22 厦门天马微电子有限公司 Backlight structure and vehicle-mounted display device
CN109116631B (en) * 2018-09-30 2021-06-15 厦门天马微电子有限公司 Backlight module, liquid crystal display module and electronic equipment

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