CN111679499A - Backlight module, liquid crystal display device and electronic equipment - Google Patents
Backlight module, liquid crystal display device and electronic equipment Download PDFInfo
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- CN111679499A CN111679499A CN202010575452.8A CN202010575452A CN111679499A CN 111679499 A CN111679499 A CN 111679499A CN 202010575452 A CN202010575452 A CN 202010575452A CN 111679499 A CN111679499 A CN 111679499A
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- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 21
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- 230000000694 effects Effects 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000013041 optical simulation Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 3
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- 239000011324 bead Substances 0.000 description 2
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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Abstract
The invention relates to the technical field of backlight modules, and provides a backlight module, a liquid crystal display device and electronic equipment. The backlight module comprises: a back plate; the light source part is arranged on one side of the back plate and is provided with an LED light source; the reflecting part is arranged on the other side of the back plate opposite to the light source part and is provided with a reflecting surface, and at least part of the surface of the reflecting surface is obliquely arranged relative to the back plate. The invention can effectively reduce the weight and/or thickness of the module, achieve higher light efficiency and overcome the problem of poor uniformity of the hollow light guide structure. Furthermore, aiming at the LED light source with asymmetric luminous intensity distribution, a specially designed reflection part is provided, and the reflection part and the light source part form a novel optical cavity together so as to realize higher light efficiency and uniformity. The invention saves the use of raw materials and reduces the cost.
Description
Technical Field
The invention relates to the technical field of backlight modules, in particular to a backlight module, a liquid crystal display device and electronic equipment.
Background
The Mini-LED light source is a new generation of light source display field, is favored by people due to small chip and wide adjustable light range, and can greatly improve the contrast ratio under relatively low energy consumption by local dimming. But some technical problems arise in practical applications. When used in a backlight, a problem of uneven light emission occurs.
The existing Mini-LED backlight technology is mainly designed in a direct type, and this design method can cause non-uniformity of light. If the Mini-LED is designed to be a side-in type light emitting structure, the uniformity of light and the utilization rate of light are improved. However, as shown in fig. 1, the light guide plate 2 is required in the conventional edge-in type design, and although the uniformity can be effectively improved, the light guide plate not only occupies the space of the backlight, but also increases the weight of the backlight. And the uniformity problem of backlight guarantee can be caused due to the problem of poor uniformity of the Mini-LEDs.
Disclosure of Invention
The invention discloses a backlight module, a liquid crystal display device and electronic equipment, and aims to solve the technical problems in the prior art.
The invention adopts the following technical scheme:
a backlight module includes: a back plate; the light source part is arranged on one side of the back plate and is provided with an LED light source; the reflecting part is arranged on the other side of the back plate opposite to the light source part and is provided with a reflecting surface, and at least part of the surface of the reflecting surface is obliquely arranged relative to the back plate.
Preferably, a hollow light guide structure is formed between the light source unit and the reflection unit.
Preferably, an included angle between a tangential direction of at least part of the surface of the reflecting surface and the back plate is an acute angle.
As the preferred technical scheme, the reflecting surface has multiple sections of reflecting surfaces; the included angle between at least one section of the reflecting surface and the back plate is different from that between other sections of the reflecting surface.
As the preferred technical scheme, the reflecting surface is a multi-section continuous reflecting surface; each section of reflecting surface is a strip reflecting surface arranged in parallel with the back plate, and included angles between the strip reflecting surfaces and the back plate are sequentially increased from one side close to the back plate to one side far away from the back plate.
Preferably, at least a part of the surface of the reflecting surface, or at least one of the reflecting surfaces, or at least one of the strip-shaped reflecting surfaces, is at an angle of 30 °, 45 °, 60 °, or 70 ° with the back plate.
As a preferred technical scheme, at least one strip-shaped reflecting surface in the multi-section continuous reflecting surfaces is vertical to the back plate. Preferably, one of the bar-shaped reflective surfaces at a side remote from the back plate is perpendicular to the back plate.
As a preferred technical scheme, the LED light source is a mini-LED light source or a micro-LED light source.
As a preferred technical scheme, the mini-LED light source is a light source with asymmetric luminous intensity.
Preferably, the light source unit has a recess, and the LED light source is disposed in the recess.
Preferably, the opening of the recess comprises at least one reflective structure.
As the preferred technical scheme, a light source placing area is arranged in the concave part, and the light source circuit board is arranged in the light source placing area.
Preferably, the back plate comprises a reflective material and/or a reflective structure.
As a preferable technical scheme, the device also comprises a diffusion film; the light source section and the reflection section each have a diffusion film placement groove in which at least a part of an edge of the diffusion film is placed.
Preferably, the film further comprises at least one layer of brightness enhancement film.
Preferably, the light source unit and the reflection unit each have a support structure.
Preferably, the light source unit and the reflecting unit each have at least one through cylindrical hole.
The invention also provides a liquid crystal display device which comprises a liquid crystal display panel and is characterized by further comprising the backlight module of any scheme.
The invention also provides electronic equipment which comprises a liquid crystal display device, wherein the liquid crystal display device comprises a liquid crystal display panel and the backlight module adopting any scheme.
The technical scheme adopted by the invention can achieve the following beneficial effects: compared with the solid light guide plate structure in the prior art, the backlight module provided by the invention has the advantages that the weight and/or thickness of the module can be effectively reduced, higher light efficiency is achieved, and the problem of poor uniformity of the hollow light guide structure is solved. Furthermore, aiming at the mini-LED with asymmetric luminous intensity distribution, a specially designed reflection part is provided, and the reflection part and the light source part form a novel optical cavity together so as to realize higher light efficiency and uniformity. The invention saves the use of raw materials and reduces the cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:
FIG. 1 is a schematic structural view of a side-entry backlight module with a light guide plate according to the prior art;
fig. 2 is a perspective view of a backlight module disclosed in embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a backlight module disclosed in embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a light source portion of a backlight module disclosed in embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of a reflection portion of a backlight module disclosed in embodiment 1 of the present invention;
fig. 6A is a schematic structural diagram of a reflection portion of a backlight module disclosed in embodiment 2 of the present invention;
fig. 6B is a schematic structural diagram of a reflection portion of a backlight module disclosed in embodiment 3 of the present invention;
fig. 7 is a schematic view of an optical model of a reflection portion of a backlight module according to embodiment 3 of the present invention;
fig. 8 is a schematic structural diagram of a reflection portion of a backlight module disclosed in embodiment 4 of the present invention;
fig. 9 is a schematic structural diagram of a backlight module disclosed in embodiment 6 of the present invention;
fig. 10 is a parameter diagram of a backlight module disclosed in embodiment 6 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The hollow light guide structure is adopted in the specific implementation mode to solve the weight problem of the backlight module, and meanwhile, if a mini-LED or a micro-LED is used for the side-in type light emitting structure, the problem of poor uniformity is solved. The following examples are provided to solve the above technical problems.
Example 1
This embodiment provides a backlight module, as shown in fig. 2 to 5, including: a back plate 10; a light source part 20 arranged at one side of the back plate, the light source part 20 having an LED light source; the backlight module further comprises a reflecting part 302 arranged on the other side of the back plate 10 opposite to the light source part 20, the reflecting part 30 is provided with a reflecting surface 32, and at least part of the surface of the reflecting surface 32 is obliquely arranged relative to the back plate.
A hollow light guide structure 100 is formed between the light source part 20 and the reflection part 30. No light guide plate is disposed between the light source unit 20 and the reflection unit 30, and the hollow light guide structure 100 is filled with a gas, such as air or other gases, or may be a vacuum. The other gas is an inert gas. It should be understood by those skilled in the art that the hollow light guide structure 100 herein does not mean that there is no structure other than gas between the light source part 20 and the reflection part 30.
The back plate 10 may be connected to the light source unit 20 and the reflection unit 30, and in another preferred embodiment, the back plate 10 may be integrally formed with the light source unit 20 and the reflection unit 30 using the same material. The light source unit 20 and the reflection unit 30 have the same height, that is, the hollow light guide structure 100 has a substantially flat structure with upper and lower surfaces parallel to each other.
Preferably, the angle between the tangential direction of at least part of the surface of the reflecting surface 32 and the back plate is acute.
According to fig. 4, preferably, the light source unit 20 has a recess 22, and an LED light source is provided in the recess 22.
Preferably, the LED light source 23 is a mini-LED light source or a micro-LED light source. Preferably, the mini-LED light source is a light source with asymmetric luminous intensity. Thanks to the backlight module structure provided by the embodiment, good uniformity can still be obtained when the LED light source 23 is a mini-LED with asymmetric light emitting intensity.
Preferably, a light source placing region is provided in the recess 22, and the light source placing region is a groove at the rear of the opening, and the width of the groove is preferably larger than the width of the opening so that the light source circuit board can be embedded therein. The light source circuit board is a PCB printed circuit board carrying the LED light source, preferably a metal core PCB board. Preferably, the mini-LED chip or the micro-LED chip is welded on the PCB. Preferably, the packaged mini-LED lamp beads or micro-LED lamp beads are welded on the PCB.
Preferably, the opening of the recess 22 comprises at least one reflective structure 27. Preferably both side walls of the opening are provided with reflective structures 27.
Preferably, the backsheet 10 includes a light reflecting material and/or a reflective structure. Preferably, the backplate 10 itself may be made of a material capable of reflecting light. Preferably, the surface of the back sheet 10 is covered with an optically reflective material having a high reflectivity to light. Preferably, the optical reflection material may be attached to the back plate 10 and located on the same side as the light emitting direction, for example: reflective sheets, reflective films, quantum dot films, and the like.
In addition, the back sheet 10 may also have a reflective structure, such as a reflective layer configuration having a three-dimensional structure. It will be understood by those skilled in the art that the properties of the hollow light guide structure 100 are not changed even if the reflective structure occupies a part of the space of the hollow light guide structure 100, and the reflective structures function to reflect light toward the back plate to form an optical cavity, i.e., a scattering reflective cavity, together with the light source part 20 and the reflective part 30.
Preferably, according to fig. 3, the backlight module further comprises a diffusion film 41; the light source section 20 and the reflection section 30 have diffusion film placing grooves 24 and 34, respectively, in which at least part of the edges of the diffusion film 41 are placed.
Preferably, at least one brightness enhancement film 42 is also included, as shown in FIG. 3. Two layers of brightness enhancement film 42 (not shown) may also be included.
Preferably, the diffuser film 41 and the brightness enhancement film 42 are disposed parallel to the back sheet 10.
Preferably, the hollow light guide structure 100 further comprises spacers for maintaining structural stability. Such as spacers provided on the backplate 10.
Preferably, according to fig. 4 and 5, the light source section 20 and the reflection section 30 have support structures 25 and 35, respectively. The supporting structures 25 and 35 are respectively strip-shaped grooves formed on the outer sides of the light source 20 and the reflecting portion 30 facing away from the hollow light guide structure 100, and are used for facilitating fixing to other modules or electronic devices.
Preferably, according to fig. 4 and 5, the light source section 20 and the reflection section 30 have at least one through cylindrical hole 26 and 36, respectively. The cylindrical holes 26 and 36 can be used for supporting and retracting circuit connecting wires.
Fig. 2, 3 and 5 correspond to a preferred embodiment of the present embodiment, and the reflecting surface 32 is a planar structure, for example, the reflecting surface 32 is disposed obliquely, and the included angle between the reflecting surface and the back plate 10 is an acute angle. In fig. 2, the light source unit 20 and the reflection unit 30 are close to each other, so as to show the relative position between the light source unit 20 and the reflection unit 30. In fact, since the height of the backlight module is low, the distance between the two is visually far greater than that shown in fig. 2.
Fig. 3 is a cross-sectional view of the three-dimensional structure shown in fig. 2, which reflects a relatively accurate proportional relationship to a certain extent, but according to different practical applications, the size ratio of the backlight module should be adjusted adaptively to match display panels with different sizes, which should be understood by those skilled in the art, and this is not limited in this embodiment.
The included angle between the reflecting surface 32 and the back plate is a key parameter, and according to the results of optical simulation and actual test, the value of the angle θ can affect the uniformity of the backlight module, and even can affect the light efficiency.
In the optical simulation, the total width W of the hollow light guide structure can be given, and then the height h is calculated by determining the value of theta, wherein the value of theta is different, and the uniformity and the utilization efficiency of light are also different. In practical use, the total width W needs to be matched with the display panel rather than variable, and the height h cannot be increased infinitely due to the thickness control of the module, and an upper limit value of the height h is usually given. On the basis, when the value of the angle theta is one of 30 degrees, 45 degrees, 60 degrees and 70 degrees, better backlight uniformity can be obtained through simulation and actual measurement.
The value of the angle θ can be determined on the basis of the length and width of the hollow light guide structure 100 determined by using a controlled variable method and the height adjusted to evaluate the optimum aspect ratio of the optical cavity.
In the embodiment of fig. 2, 3 and 5, the reflection unit 30 has a relatively simple structure, is easy to manufacture, and can achieve a good technical effect.
Example 2
This embodiment provides a backlight unit, and this backlight unit includes: a back plate 10; a light source part 20 arranged at one side of the back plate, the light source part 20 having an LED light source; the backlight module further includes a reflection portion 302 disposed on the other side of the back plate 10 opposite to the light source portion 20, and the reflection portion 30 has a reflection surface 32.
According to fig. 6A, the reflecting surface 32 in this embodiment has a different configuration from that in embodiment 1. The reflecting surface 32 has a plurality of stages of reflecting surfaces, and the reflecting surface 32 may be a continuous plurality of stages of reflecting surfaces or a discontinuous plurality of stages of reflecting surfaces provided separately.
Preferably, the reflecting surface 32 is a plurality of continuous segments, preferably at least one of the segments is inclined to the back plate differently than the other segments.
Preferably, each segment of the reflective surface is a bar-shaped reflective surface 321, 322, 323 arranged parallel to the backplane, and the included angles between the plurality of bar-shaped reflective surfaces 321, 322, 323 and the backplane 10 increase sequentially from the side close to the backplane 10 to the side far from the backplane 10.
According to the results of optical simulation and practical tests, when at least one of the angles between the plurality of bar-shaped reflecting surfaces 321, 322, 323 and the back plate 10 is one of 30 °, 45 °, 60 ° and 70 °, better backlight uniformity and light utilization efficiency are more likely to be obtained. When a plurality of the plurality of bar-shaped reflecting surfaces 321, 322, 323 meet the requirement that the included angle with the back plate 10 is 30 degrees, 45 degrees, 60 degrees, 70 degrees, a better effect can be obtained. For example, the angles between the bar-shaped reflective surfaces 321, 322, 323 and the back plate 10 are respectively 30 °, 45 °, and 60 °, so that better backlight uniformity and light utilization efficiency can be obtained.
In the embodiment, the reflecting portion 30 has a relatively complex structure, but is also easy to manufacture, and can achieve better technical effects
Example 3
This embodiment provides a backlight unit, and this backlight unit includes: a back plate 10; a light source part 20 arranged at one side of the back plate, the light source part 20 having an LED light source; the backlight module further includes a reflection portion 302 disposed on the other side of the back plate 10 opposite to the light source portion 20, and the reflection portion 30 has a reflection surface 32.
Referring to fig. 6B, the reflecting surface 32 of the present embodiment has a different configuration from that of embodiment 2. The reflecting surface 32 is a plurality of continuous segments of reflecting surface, preferably at least one of the segments of reflecting surface forms an angle with the back plate different from the other segments of reflecting surface. And at least one section of the reflecting surface is vertical to the back plate.
Preferably, each section of the reflective surface is a bar-shaped reflective surface 321, 322, 324 arranged parallel to the back plate, and the included angles between the plurality of bar-shaped reflective surfaces 321, 322, 324 and the back plate 10 increase from the side close to the back plate 10 to the side far from the back plate 10 in sequence until the bar-shaped reflective surface 324 is perpendicular to the back plate.
According to the results of optical simulation and practical tests, when at least one of the angles between the plurality of bar-shaped reflecting surfaces 321 and 322 and the back plate 10 is one of 30 °, 45 °, 60 ° and 70 °, better backlight uniformity and light utilization efficiency are more likely to be obtained. When a plurality of the plurality of bar-shaped reflecting surfaces 321 and 322 meet the requirement that the included angle with the back plate 10 is 30 degrees, 45 degrees, 60 degrees or 70 degrees, and one of the bar-shaped reflecting surfaces is perpendicular to the back plate 10, a better effect can be obtained. For example, the angles between the bar-shaped reflective surfaces 321 and 322 and the back plate 10 are 45 ° and 70 °, respectively, and the bar-shaped reflective surface 324 is perpendicular to the back plate, so as to obtain better backlight uniformity and light utilization efficiency.
According to fig. 7, a preferred method for obtaining the optimal parameters is also provided in this embodiment. Suppose L1、L2、L3Three incident rays from the mini-LED, n1、n2、n3Respectively, three incident light rays are normal lines perpendicular to the XZ plane. Theta3And theta4Are respectively L1And reflected light formed by diffuse reflection by VARS, theta6And theta7Are respectively L2And reflected light formed by diffuse reflection by VARS, theta9And theta10Are respectively L3And reflected light formed by diffuse reflection by VARS. W0Total width of hollow light guide structure, h0The total height of the hollow light guide framework.
Uniformity (brightness minimum/brightness maximum) 100% (1)
From the figure, the following equation can be derived:
tanθ2＝(h0-h0/6)/(W0/2) (2)
h3＝h0-h0/6 (3)
θ1＝90°-θ2-θ3(4)
h2＝h0-(3/6)h0＝h0/2 (5)
θ5＝90°-θ1(6)
h1＝h0-(5/6)h0(7)
θ8＝90°-θ1(8)
obtaining an equation of the VARS model according to equations (2) - (8):
Y＝A+ΣBi*Xi，i＝0,1,2……
where A is a constant, the values of B1-B6 are shown in the following table:
| Intercept(A) | -3.49128*10-14 |
| B1 | 16.708 |
| B2 | -48.53044 |
| B3 | 56.33018 |
| B4 | -18.82259 |
| B5 | -4.49559 |
| B6 | 2.73919 |
by the above model, we can give the total width W of the hollow light guide architecture0And then calculating the height h by determining the value of theta. The value of θ is different, and the uniformity and the utilization efficiency of light are also different.
In the present embodiment, the included angle between the reflective portion 30 and the back plate 10 is relatively large, which is more suitable for the case where the total width W is large, and better backlight uniformity and light utilization efficiency are obtained.
Example 4
This embodiment provides a backlight unit, and this backlight unit includes: a back plate 10; a light source part 20 arranged at one side of the back plate, the light source part 20 having an LED light source; the backlight module further includes a reflection portion 302 disposed on the other side of the back plate 10 opposite to the light source portion 20, and the reflection portion 30 has a reflection surface 32.
Referring to fig. 7, the reflecting surface 32 of the present embodiment has a different configuration from those of embodiments 1 to 3. The reflective surface 32 is a continuous curved reflective surface that can be selected from, but is not limited to, a circular arc surface, a paraboloid surface, a wave-shaped curved surface, and the like. Those skilled in the art will appreciate that the choice can be made according to different practical use cases.
According to the results of optical simulation and practical test, when the included angle between the continuous curved surface and the back plate covers a plurality of angles of 30 degrees, 45 degrees, 60 degrees and 70 degrees, better backlight uniformity and light utilization efficiency are more likely to be obtained. Especially when the top of the reflecting surface 32 is perpendicular to the back plate, better technical effects can be obtained.
In this embodiment, the reflecting surface 32 is a continuous curved surface, which can realize more accurate light control and obtain better backlight uniformity and light utilization efficiency.
Example 5
The embodiment provides a liquid crystal display device, which comprises a liquid crystal display panel and a backlight module.
The embodiment also provides an electronic device comprising a liquid crystal display device, wherein the liquid crystal display device comprises a liquid crystal display panel and a backlight module.
The liquid crystal display panel may be selected from any liquid crystal display panel in the art, which is not limited in this embodiment. The backlight module comprises: a back plate 10; a light source part 20 arranged at one side of the back plate, the light source part 20 having an LED light source; the backlight module further comprises a reflecting part 302 arranged on the other side of the back plate 10 opposite to the light source part 20, the reflecting part 30 is provided with a reflecting surface 32, and at least part of the surface of the reflecting surface 32 is obliquely arranged relative to the back plate.
The specific scheme of the backlight module is preferably the same as the scheme provided in embodiments 1-4, and is not described again.
Compared with the prior art, the liquid crystal display device and the electronic equipment of the embodiment have the following technical effects: compare prior art, can effectively reduce module weight and/or thickness, reach higher optical efficiency, overcome the poor problem of hollow light guide structure homogeneity simultaneously. Furthermore, aiming at the mini-LED with asymmetric luminous intensity distribution, a specially designed reflection part is provided, and the reflection part and the light source part form a novel optical cavity together so as to realize higher light efficiency and uniformity. The invention saves the use of raw materials and reduces the cost.
Example 6
The embodiment provides a liquid crystal display device, which is preferably suitable for equipment or scenes which are insensitive to the thickness of the display device, such as vehicle-mounted industrial control, and the like, but requires that the uniformity and the optical efficiency of a backlight module are good, and simultaneously requires that the weight of the module is controlled within an ideal range. The liquid crystal display device comprises a liquid crystal display panel and a backlight module.
The backlight module comprises: a back plate 10; a light source part 20 arranged at one side of the back plate, the light source part 20 having an LED light source; the backlight module further comprises a reflecting part 302 arranged on the other side of the back plate 10 opposite to the light source part 20, the reflecting part 30 is provided with a reflecting surface 32, and at least part of the surface of the reflecting surface 32 is obliquely arranged relative to the back plate.
As shown in FIG. 9, the light efficiency and uniformity of the backlight module is related to the aspect ratio of the light cavity (i.e., hollow light guide structure 100), which can be denoted as W0/H0Wherein W is0Denotes the optical cavity width, H0Indicating the optical cavity height. Height is also one of the factors affecting uniformity. In a specific use scenario, a constant width of 42.8mm is set, but the height H is changed0To evaluate the optimal aspect ratio (i.e., aspect ratio), fig. 10 shows the test results of the light efficiency and uniformity of the backlight module at different aspect ratios. It can be found by testing and simulation that when the optimum aspect ratio is in the range of 4.3: when 1, the uniformity is the best. And, when the reflecting surface angle is set to 45 °.
Furthermore, in order to improve the overall uniformity, the opening of the recess 22 comprises at least one reflective structure 27. Preferably both side walls of the opening have a reflecting structure 27, which reflecting structure 27 is two sloping reflecting surfaces provided at the entrance of the hollow cavity. The angle between the two reflecting structures 27 also has an effect on the uniformity. Preferably, when the included angle between the two reflective structures 27 is 30 °, the uniformity of the backlight module reaches 90.8%, and the efficiency reaches 82.5%.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A backlight module, comprising:
-a back plate;
-a light source section arranged at one side of the back plate, the light source section having LED light sources;
a reflecting portion provided at the other side of the back plate opposite to the light source portion, the reflecting portion having a reflecting surface, at least a part of the surface of the reflecting surface being disposed obliquely with respect to the back plate.
2. A backlight module according to claim 1, wherein a hollow light guide structure is formed between the light source part and the reflection part.
3. The backlight module according to claim 1, wherein an angle between a tangential direction of at least a portion of the surface of the reflective surface and the back plate is acute.
4. The backlight module according to claim 1, wherein the reflective surface has a plurality of segments; the included angle between at least one section of the reflecting surface and the back plate is different from that between other sections of the reflecting surfaces.
5. The backlight module as claimed in claim 1, wherein the reflective surface is a multi-segment continuous reflective surface; each section of reflecting surface is a strip-shaped reflecting surface arranged in parallel with the back plate, and the included angle between each strip-shaped reflecting surface and the back plate is increased in sequence from one side close to the back plate to one side far away from the back plate.
6. A backlight module according to any one of claims 3-5, wherein at least a part of the surface of the reflecting surface, or at least one of the reflecting surfaces of the plurality of reflecting surfaces, or at least one of the reflecting surfaces of the plurality of continuous reflecting surfaces, is at an angle of one of 30 °, 45 °, 60 ° and 70 ° with respect to the back plate.
7. The backlight module according to claim 1, wherein the LED light source is an asymmetric luminous intensity light source.
8. The backlight module according to any one of claims 1-5, wherein the light source part has a recess in which the LED light source is disposed.
9. A backlight module according to claim 8, wherein the opening of the recess comprises at least one reflective structure.
10. The backlight module according to claim 8, wherein a light source placing area is disposed in the recess, and a light source circuit board is disposed in the light source placing area.
11. The backlight module according to any of claims 1-5, wherein the back plate comprises a light reflecting material and/or a reflective structure; preferably, the first and second electrodes are formed of a metal,
also includes a diffusion membrane; the light source part and the reflecting part are provided with diffusion film placing grooves, and at least partial edges of the diffusion films are placed in the placing grooves;
preferably, the film further comprises at least one layer of brightness enhancement film;
preferably, the light source part and the reflecting part are both provided with a supporting framework;
preferably, the light source part and the reflection part are provided with at least one through cylindrical hole.
12. A liquid crystal display device comprising a liquid crystal display panel, further comprising the backlight module according to any one of claims 1 to 16.
13. An electronic device comprising a liquid crystal display device, the liquid crystal display device comprising a liquid crystal display panel and the backlight module of any one of claims 1-16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010575452.8A CN111679499A (en) | 2020-06-22 | 2020-06-22 | Backlight module, liquid crystal display device and electronic equipment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017281A (en) * | 2006-02-10 | 2007-08-15 | 鸿富锦精密工业（深圳）有限公司 | Back light system |
| US20100208490A1 (en) * | 2007-10-12 | 2010-08-19 | Harison Toshiba Lighting Corporation | Hollow type planar illuminatng device |
| CN102165356A (en) * | 2008-09-25 | 2011-08-24 | 皇家飞利浦电子股份有限公司 | Illumination system, luminaire, collimator, and display device |
| US20130058126A1 (en) * | 2011-09-01 | 2013-03-07 | Kyung-min Kim | Light-Source Unit, Back-Light Unit Having the Same, And Display Device Having the Same |
| CN207440478U (en) * | 2017-11-03 | 2018-06-01 | 广州毅昌科技股份有限公司 | A kind of side entering type Air-guiding of light laser light source backlight module |
| CN109031792A (en) * | 2018-10-11 | 2018-12-18 | 合肥惠科金扬科技有限公司 | Backlight module and display device |
-
2020
- 2020-06-22 CN CN202010575452.8A patent/CN111679499A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017281A (en) * | 2006-02-10 | 2007-08-15 | 鸿富锦精密工业（深圳）有限公司 | Back light system |
| US20100208490A1 (en) * | 2007-10-12 | 2010-08-19 | Harison Toshiba Lighting Corporation | Hollow type planar illuminatng device |
| CN102165356A (en) * | 2008-09-25 | 2011-08-24 | 皇家飞利浦电子股份有限公司 | Illumination system, luminaire, collimator, and display device |
| US20130058126A1 (en) * | 2011-09-01 | 2013-03-07 | Kyung-min Kim | Light-Source Unit, Back-Light Unit Having the Same, And Display Device Having the Same |
| CN207440478U (en) * | 2017-11-03 | 2018-06-01 | 广州毅昌科技股份有限公司 | A kind of side entering type Air-guiding of light laser light source backlight module |
| CN109031792A (en) * | 2018-10-11 | 2018-12-18 | 合肥惠科金扬科技有限公司 | Backlight module and display device |
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Application publication date: 20200918 |