CN208399860U - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN208399860U CN208399860U CN201820998883.3U CN201820998883U CN208399860U CN 208399860 U CN208399860 U CN 208399860U CN 201820998883 U CN201820998883 U CN 201820998883U CN 208399860 U CN208399860 U CN 208399860U
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Abstract
The utility model discloses a kind of backlight module and display devices, are related to display screen technology field, and main purpose is the phenomenon that being transferred to light guide plate after the backlight issued to backlight is scattered, make light guide plate incident side even light mixing, avoid brightness unevenness.The main technical schemes of the utility model are as follows: a kind of backlight module, the backlight module include: light guide plate, astigmatism plate and backlight；Light guide plate is set to the side of astigmatism plate, and backlight is set to astigmatism plate opposite to each other in the other side of light guide plate, and astigmatism plate is transmitted for being transferred in light guide plate after being scattered the backlight that backlight issues.The utility model is mainly used for providing backlight for liquid crystal display.
Description
Technical field
The utility model relates to display screen technology field more particularly to a kind of backlight module and display devices.
Background technique
With being widely used for liquid crystal display, user gets over the brightness of liquid crystal display and the requirement of light uniformity coefficient
Come higher, wherein light emitting diode and light guide plate in LCD screen backlight mould group are that influence liquid crystal display light is uniform
The main component of degree.
The most common backlight of liquid crystal display is side entering type light emitting diode ((Light Emitting Diode, LED)
Point light source, with the promotion of LED luminous efficiency, the luminescent lumen of single LED is constantly promoted, equivalents brightness specifications, on an equal basis
LED number used in backlight under size is fewer and fewer, and LED spacing becomes larger, and the light of LED can not be before entering light guide plate
Even light mixing causes light guide plate incident side the phenomenon that brightness unevenness occur.
Utility model content
In view of this, it is to backlight that the utility model embodiment, which provides a kind of backlight module and display device, main purpose,
The phenomenon that backlight that source issues is transferred to light guide plate, makes light guide plate incident side even light mixing, avoid brightness unevenness after being scattered.
In order to achieve the above objectives, the utility model mainly provides the following technical solutions:
On the one hand, the utility model embodiment provides a kind of backlight module, which includes:
Light guide plate, astigmatism plate and backlight；
Light guide plate is set to the side of astigmatism plate, and backlight is set to astigmatism plate opposite to each other in the other side of light guide plate, dissipates
Tabula rasa is transmitted for being transferred in light guide plate after being scattered the backlight that backlight issues.
Optionally, astigmatism plate is the diffusion sheet with multiple protrusion particles；
Multiple protrusion particles are located at the first side of diffusion sheet, and the first side of diffusion sheet is arranged relative to backlight.
Optionally, multiple protrusion particles are semicircle or zigzag.
Optionally, astigmatism plate is the prismatic lens with prism structure.
Optionally, astigmatism plate is micro-structure light-collecting piece.
Optionally, the connection type between light guide plate and astigmatism plate is Nian Jie.
Optionally, there is gap between astigmatism plate and backlight.
Optionally, backlight includes substrate and multiple LED chips for being set on substrate, and multiple LED chips are for issuing
In backlight to light guide plate.
On the other hand, the utility model embodiment also provides a kind of display device, which includes:
The backlight module of any of the above-described embodiment.
A kind of backlight module and display device that the utility model embodiment proposes, backlight for being issued to backlight into
It is transferred to light guide plate after row scattering, makes light guide plate incident side even light mixing, in the prior art, side entering type display device shines
Source is frequently with LED point light source, and with the promotion of LED luminous efficiency, the luminescent lumen of single LED is constantly promoted, and equivalents are bright
The quantity of metric lattice, LED used in the backlight design under comparable size is fewer and fewer, and the spacing of LED increases, and makes the light of LED
Can not enter light guide plate before uniform mixed light, meanwhile, the requirement lightening to display device cause select light guide plate it is more next
It is thinner, it eventually leads to side entering-type LED backlight mould group incident side and the HotSpot phenomenon of brightness unevenness occurs.Compared with prior art,
In the backlight module that present specification provides, astigmatism plate is provided between light guide plate and backlight, astigmatism plate issues backlight
Backlight be scattered after be transferred to transmission in light guide plate, make light guide plate incident side even light mixing, avoid light guide plate and enter light
Dark uneven phenomenon.
Detailed description of the invention
Fig. 1 is back light module unit structure schematic diagram in the prior art；
Fig. 2 is backlight module dark space structural schematic diagram in the prior art；
Fig. 3 is a kind of structural schematic diagram of backlight module provided by the embodiment of the utility model.
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined purpose of utility model and being taken,
Below in conjunction with attached drawing and preferred embodiment, to according to the utility model proposes backlight module and display device its specific embodiment party
Formula, structure, feature and its effect, detailed description is as follows.
In the prior art, the most common backlight of liquid crystal display is side entering type light emitting diode point light source, and backlight is set
It sets in the side of light guide plate, backlight includes substrate and multiple LED luminous points for being disposed on the substrate, and LED luminous point prolongs leaded light
The side of plate is set side by side, and the light that each LED luminous point issues is injected in light guide plate simultaneously by the side of light guide plate, and in leaded light
Transmission in plate is embodied as light guide plate and provides backlight.But with the promotion of LED luminous efficiency, the luminescent lumen of single LED is not
Disconnected to be promoted, equivalents brightness specifications, LED quantity used in the backlight design under comparable size is fewer and fewer, between LED between
Away from increasing, meanwhile, the requirement lightening to display screen causes light guide plate used more and more thinner, so that each LED luminous point is sent out
Light out can not before injecting light guide plate even light mixing, eventually lead to light guide plate incident side and brightness unevenness occur
HotSpot phenomenon.
Specifically, as shown in Figure 1, light guide plate 1 include visible area and surround the one week non-visible area in visible area edge, for
Brightness is 250nit, CG45%, 14inch, and the liquid crystal display of IPS mode, normally LED used in backlight 2 used shines
The quantity of point 3 is 30ea, and since the distance between LED luminous point 3 is smaller, all 3 light emitting angers of LED luminous point are 120 °, each LED
The light that luminous point 3 issues crosses on the outside of light guide plate 1, normal light mixing when into light guide plate 1, so that 1 visible area of light guide plate enters
Light sidelight line is uniform.But with the promotion of single LED luminous efficiency, in the case where liquid crystal display brightness demand is constant,
Need to reduce the quantity of LED luminous point 3, for example, as shown in Fig. 2, the quantity of the LED luminous point 3 used is reduced to 20ea, LED
The spacing of luminous point 3 increases, and the light that each LED luminous point 3 issues can not timely cross on the outside of light guide plate 1, causes adjacent
3 light of LED luminous point is overlapped in 1 visible area of light guide plate, and the material due to light guide plate 1 causes light to be sent out with environment difference
Raw refraction, deviates light coincidence point more to 1 visible area of light guide plate, the place for having light to inject in the visible area of light guide plate 1
It is bright, and the region of light not will form dark space 4 in the visible area of light guide plate 1, be shown as dark, and then in light guide plate side
There is the HotSpot phenomenon of brightness unevenness, influences the normal use of user.
As shown in Figure 3, on the one hand, the utility model embodiment provides a kind of backlight module, which includes:
Light guide plate 5, astigmatism plate 6 and backlight 7；
Light guide plate 5 is set to the side of astigmatism plate 6, and backlight 7 is set to astigmatism plate 6 opposite to each other in other the one of light guide plate 5
Side, astigmatism plate 6 are transmitted for being transferred in light guide plate 1 after being scattered the backlight that backlight 7 issues.
Wherein, light guide plate 5 can be the acryl plates of optical grade, with the high reflectivity and not high-tech of extinction
Material stamps light guiding points in the acryl plates bottom surface of optical grade, is reflected into the light that backlight 7 issues respectively using light guiding points
A angle makes 5 uniformly light-emitting of light guide plate.Light guide plate 5 can be various shapes, for example, light guide plate 5 can be rectangle, circle,
Or light guide plate 5 can be clapboard, be while to be thick from the point of view of light inlet be thin wedge shape (triangle).Light guide plate 5
It is passive light-emitting component, itself does not shine, and backlight 7 is used to provide backlight for light guide plate 5, and common backlight 7 is LED back
Light source, LED backlight service life are more than 5000 hours, and use DC voltage, are more widely applied, LED backlight is by more
The LED light bar (LED light-bar) of a LED luminous point composition, provides light for light guide plate 5, LED luminous point is generally rectangular
LED patch, each LED patch issue the light of fixed angle to fixed-direction.Backlight 7 can be single led lamp bar, setting
In the side of light guide plate 5, the not ipsilateral of light guide plate 5 is arranged in backlight 7 or multiple groups LED light bar.For example, light guide plate 5
For rectangle, backlight 7 is single led lamp bar, and LED light bar can be set in 5 side of rectangle light guide plate, and backlight 7 can also
Think two LED light bars, be separately positioned on the different two sides of rectangle light guide plate 5, provides backlight jointly for light guide plate 5, and or
Person, light guide plate 5 are circle, and LED light bar is prolonged 5 circular edges of light guide plate and is arranged along outer lateral bend.Astigmatism plate 6 is located at light guide plate 5 and back
Between light source 7, for changing the light direction of propagation, increase the angle that backlight 7 emits beam.Astigmatism plate 6 is non-with light guide plate 5
Integrated formed structure.The light that backlight 7 issues injects astigmatism plate 6 first, 7 light of backlight is promoted to exist in communication process
It is scattered when touching astigmatism plate 6 to multiple and different directions, increases the angle that light is propagated, the light for issuing backlight 7 is being led
Light mixing guarantees that the light for injecting 5 incident side of light guide plate is uniform light at uniform light on the outside of 5 visible area of tabula rasa.
A kind of backlight module that the utility model embodiment proposes, for being passed after being scattered to the backlight that backlight issues
Be handed to light guide plate, make light guide plate incident side even light mixing, in the prior art, the light emitting source of side entering type display device frequently with
LED point light source, with the promotion of LED luminous efficiency, the luminescent lumen of single LED is constantly promoted, equivalents brightness specifications, together
LED luminous point quantity used in backlight design under equidimension is fewer and fewer, and LED luminous point spacing increases, meanwhile, display is filled
Setting lightening requirement causes the light guide plate selected more and more thinner, mix the light of LED can not before entering light guide plate uniformly
Light eventually leads to side entering-type LED backlight mould group incident side and the HotSpot phenomenon of brightness unevenness occurs.Compared with prior art, originally
In the backlight module that application documents provide, astigmatism plate is provided between light guide plate and backlight, astigmatism plate issues backlight
Backlight is transferred to transmission in light guide plate after being scattered, make light guide plate incident side even light mixing, avoids light guide plate and enters light secretly
Uneven phenomenon.
Specifically, astigmatism plate 6 is the diffusion sheet with multiple protrusion particles 8；
Multiple protrusion particles 8 are located at the first side of diffusion sheet, and the first side of diffusion sheet is arranged relative to backlight 7.
Wherein, the particle 8 of protrusion can be various shapes, and optionally, multiple protrusion particles are semicircle, zigzag, three
Angular or round, multiple protrusion particles 8 are fixed on the substrate 9 of diffusion sheet, can regular distribution, can also be randomly distributed.With prominent
For particle 8 is played as semicircle, during the light that backlight 7 issues is propagated, semicircular protrusion grain is touched first
Son 8, light is subject to be reflected with the normal of semicircle at semicircle contact point, since light is located at the direction position of semicircle normal
It sets that be located at light guide plate normal direction position from light different, and then changes the original refractive direction of light, make light in leaded light
Intersect outside 5 incident side of plate, makes the light even light mixing into light guide plate.It is also possible to change the material of astigmatism plate 6, make
The refractive index that light enters astigmatism plate 6 is less than the refractive index into light guide plate 5, even if semicircle particle is to the refractive direction of light
It is consistent with refractive direction of the light guide plate to light, also due to the low-refraction of semicircle particle makes light cross in advance, improve
The phenomenon of incident side light and shade unevenness.As shown in figure 3, LED backlight is from top to bottom disposed with the first LED luminous point, second
LED luminous point, the 3rd LED luminous point, the 4th LED luminous point, the first LED luminous point light lower edge and the 2nd LED shine
Light top edge is put due to the material of astigmatism plate 6 and the change of incident angle, light intersects in the non-visible area of light guide plate 5,
The uniform mixed light when entering the visible area of light guide plate 5, the 3rd LED luminous point light lower edge and the 4th LED luminous point
Light top edge is since the direction that light is located at normal at incidence point changes, so that the refraction angle of light changes, light
Intersect in astigmatism plate 6, equally, the light intersection of the 2nd LED luminous point and the 3rd LED luminous point also is located at light guide plate 5
On the outside of visible area, realize that the light in the visible area for entering light guide plate 5 is the light of even light mixing.
In addition, astigmatism plate 6 can also be prismatic lens or micro-structure light-collecting piece with prism structure.
The prismatic lens or micro-structure light-collecting piece of prism structure can carry out multiple directions to the light that backlight issues
Scattering, increase the incident angle of incident ray, realize in 5 outside even light mixing of light guide plate, improve light guide plate 5 and enter light not
?.
Specifically, the connection type between light guide plate 5 and astigmatism plate 6 is Nian Jie.
Astigmatism plate 6 and light guide plate 5 are separate structure, realize that light guide plate 5 and astigmatism plate 6 can carry out processing and fabricating respectively,
If light guide plate 5 is integrated with astigmatism plate 6, in the production process by mold single injection-molded, needs to modify mold and gone
The processing of integralization light guide plate 5 and astigmatism plate 6, the correcting period is long, and corresponding speed of production is slow.Furthermore it is also possible to using mechanical
Building up by welding mode processes light guide plate 5, increases diffusing structure on light guide plate 5, but is not machined easily jagged, processing essence
It spends limited, not can guarantee into flash ranging smoothness of the surface, cause light loss serious.If entering flash ranging increasing using light guide plate 5 is squeezed
Add diffusing structure, processing method is by heating mould idler wheel, directly thermo-contact 5 incident side of light guide plate, the melting formation of light guide plate 5
Diffusing structure also needs modification mold, not only extends the correcting period, slows down speed of production, and hot-working is also easily jagged
It generates, has an adverse effect to light propagation.Therefore, real in such a way that astigmatism plate 6 and light guide plate 5 are processed and bonded respectively
Do not change original 5 process of light guide plate now, individually processes astigmatism plate 6.Since astigmatism plate 6 is big compared to the size of light guide plate 5
Big to reduce, individually processing astigmatism plate 6 operates simpler, meanwhile, a kind of astigmatism plate 6 can correspond to a kind of backlight 7, so that dissipating
Tabula rasa 6 can be produced in batches according to the type of backlight 7, and due to without the concern for light guide plate 5 material and shape into
Individually exploitation astigmatism plate 6, shortening exploitation solve the period to row, quickly suitable astigmatism plate 6 can be developed for backlight 7, due to astigmatism
Plate 6 is small in size, touches tool production simply, greatly reduces development and production cost, improve processing efficiency.The astigmatism plate being separately provided
6 can according to need and be replaced, if same light guide plate 5 can replace different astigmatism plates 6 according to the difference of backlight 7,
Increase the universality of backlight module.Bonding can use a variety of cohesive materials, form cementing layer 6 in abutting edge, guarantee light
Utilization rate, usual cohesive material are optical grade glue, for example, the compound optical grade glue used of existing multilayer film.
Also there is gap between astigmatism plate and backlight, specifically, as shown in Figure 3, wherein astigmatism plate 6 and backlight 7
Between be separated with the cementing layer 10 of one fixed width, light is issued by LED luminous point, after the scattering of half-circle projection 8, is successively passed through
It crosses after substrate 9 and cementing layer 10 and enters the non-visible area of light guide plate 5, light has crossed even light mixing at this time, and then enters and lead
The light of tabula rasa 5 is uniform, and the light and shade for avoiding 5 incident side of light guide plate is uneven.Specifically, can reduce light guide plate 5 enters light side
The region vacated is set gradually astigmatism plate 6 and cementing layer 10, the highest of the protrusion particle 4 of astigmatism plate 6 by the width of non-visible area
It is identical as at a distance from backlight 2 that point enters at a distance from backlight 7 with light guide plate 1 in Fig. 2 light one side edge, and such setting can be with
Do not change light guide plate 5 and the common the space occupied of backlight 7, avoids the change to the original device placement position of backlight module.
Optionally, backlight 7 includes substrate and the multiple LED chips being set on substrate, and multiple LED chips are for issuing
In backlight to light guide plate 5.
LED chip can be disk and square piece, and by taking square piece as an example, square piece is fixed on substrate on one side, is carried out by another side
It shines and provides backlight for light guide plate 5, the light emitting angle of LED chip is usually 120 °, and LED chip can produce sufficiently wide color
Domain makes up liquid crystal display and shows the insufficient defect of number of colours, makes it to meet or exceed Adobe RGB and NTSC color
Color standard requirements.Substrate can be various material, if substrate can be reflective material, make the more guides of the light of LED chip
5 side of tabula rasa is propagated, and 5 brightness of light guide plate is increased.Substrate can be that soft board and hardboard can bases when substrate uses soft board
The shape of light guide plate 5 is arbitrarily sprawled.
On the other hand, the utility model embodiment also provides a kind of display device, which includes:
The backlight module of any of the above-described embodiment.
A kind of display device that the utility model embodiment proposes, for being passed after being scattered to the backlight that backlight issues
Be handed to light guide plate, light guide plate made to enter flash ranging even light mixing, in the prior art, the light emitting source of side entering type display device frequently with
LED point light source, with the promotion of LED luminous efficiency, the luminescent lumen of single LED is constantly promoted, equivalents brightness specifications, together
LED luminous point quantity used in backlight design under equidimension is fewer and fewer, and LED luminous point spacing increases, meanwhile, display device
It is lightening requirement cause select light guide plate it is more and more thinner, make LED light can not enter light guide plate before uniform mixed light, most
Side entering-type LED backlight mould group incident side is caused the HotSpot phenomenon of brightness unevenness occur eventually.Compared with prior art, the application
In the backlight module that file provides, astigmatism plate, the backlight that astigmatism plate issues backlight are provided between light guide plate and backlight
Be transferred to transmission in light guide plate after being scattered, make light guide plate incident side even light mixing, avoid light guide plate incident side it is bright it is dark not
Equal phenomenon.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with the power
Subject to the protection scope that benefit requires.
Claims (9)
1. a kind of backlight module characterized by comprising
Light guide plate, astigmatism plate and backlight；
The light guide plate is set to the side of the astigmatism plate, and the backlight is set to the astigmatism plate opposite to each other in the leaded light
The other side of plate, the astigmatism plate after being scattered the backlight that the backlight issues for being transferred in the light guide plate
Transmission.
2. backlight module according to claim 1, which is characterized in that
The astigmatism plate is the diffusion sheet with multiple protrusion particles；
The multiple protrusion particle is located at the first side of the diffusion sheet, and the first side of the diffusion sheet is relative to the backlight
Setting.
3. backlight module according to claim 2, which is characterized in that
The multiple protrusion particle is semicircle or zigzag.
4. backlight module according to claim 1, which is characterized in that
The astigmatism plate is the prismatic lens with prism structure.
5. backlight module according to claim 1, which is characterized in that
The astigmatism plate is micro-structure light-collecting piece.
6. backlight module according to claim 1, which is characterized in that
Connection type between the light guide plate and the astigmatism plate is Nian Jie.
7. backlight module according to claim 6, which is characterized in that
There is gap between the astigmatism plate and the backlight.
8. backlight module according to claim 1, which is characterized in that
The backlight includes substrate and multiple LED chips for being set on the substrate, and multiple LED chips are for issuing
In backlight to the light guide plate.
9. a kind of display device characterized by comprising
Such as backlight module described in any item of the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820998883.3U CN208399860U (en) | 2018-06-27 | 2018-06-27 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820998883.3U CN208399860U (en) | 2018-06-27 | 2018-06-27 | Backlight module and display device |
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| CN208399860U true CN208399860U (en) | 2019-01-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113936541A (en) * | 2020-06-29 | 2022-01-14 | 京东方科技集团股份有限公司 | Direct type backlight module and display device |
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2018
- 2018-06-27 CN CN201820998883.3U patent/CN208399860U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113936541A (en) * | 2020-06-29 | 2022-01-14 | 京东方科技集团股份有限公司 | Direct type backlight module and display device |
| CN113936541B (en) * | 2020-06-29 | 2023-02-21 | 京东方科技集团股份有限公司 | Direct type backlight module and display device |
| US11796155B2 (en) | 2020-06-29 | 2023-10-24 | Beijing Boe Optoelectronics Technology Co., Ltd. | Backlight assembly and display device |
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