CN211786510U - Optical film, backlight module and display device - Google Patents
Optical film, backlight module and display device Download PDFInfo
- Publication number
- CN211786510U CN211786510U CN202020612179.7U CN202020612179U CN211786510U CN 211786510 U CN211786510 U CN 211786510U CN 202020612179 U CN202020612179 U CN 202020612179U CN 211786510 U CN211786510 U CN 211786510U
- Authority
- CN
- China
- Prior art keywords
- microstructures
- optical film
- light
- low
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to an optics diaphragm, backlight unit and display device. The optical film comprises a light inlet side and a light outlet side opposite to the light inlet side, the optical film is partitioned into a middle area and two side areas respectively positioned at two sides of the middle area along the direction of an X axis, a plurality of protruding strip-shaped structures are arranged at the light outlet side of each side area, the strip-shaped structures are arranged along the direction of the X axis, each strip-shaped structure extends along the direction of a Y axis vertical to the X axis, and each strip-shaped structure comprises a high microstructure and a low microstructure which are repeatedly arranged and are lower than the high microstructure. Through the form and arrangement mode of the strip-shaped structures on the optical film, light rays with too large angles can be refracted again, so that the problems of large-angle light fields and large-angle light leakage are solved, and the contrast of the large-angle visual angles is improved. The backlight module and the display device comprise the optical film.
Description
Technical Field
The utility model relates to an optical element especially relates to and improves wide-angle light leak and improve optical film piece, backlight unit and display device of wide-angle contrast.
Background
Since the lcd panel does not have the function of emitting light, a backlight module (backlight module) must be disposed below the lcd panel to provide a surface light source, so that the lcd panel can achieve the purpose of displaying.
Generally speaking, the light source module can be divided into a direct type light source module and a side type light source module. Taking a direct-type light source module as an example, the direct-type light source module generally includes a plurality of light emitting elements, a reflector for concentrating light from the light emitting element array to a forward direction, and a multi-layer optical film set for reducing a viewing angle of an outgoing light beam, and improving a forward luminance value and light extraction efficiency. On the other hand, taking the lateral light source module as an example, it generally includes a light guide plate, a reflective sheet located under the light guide plate, a light source located at the side of the light guide plate, and the aforementioned multilayer optical film set. The light beams emitted by the light source enter the light guide plate from the light incident surface on the side of the light guide plate and are guided into the whole light guide plate due to total reflection. The multiple mesh points on the bottom surface of the light guide plate can destroy the total reflection of light, so that light beams are emitted from the light emitting surface of the light guide plate, and the forward luminance value and the light emitting efficiency are improved by the multilayer optical film group, thereby forming a required surface light source.
However, in the direct-type light source module or the side-type light source module, when a user watches two side areas of the screen, the larger the screen is, the larger the viewing angle of the user becomes, which causes light leakage at the large viewing angle area of the screen, and causes white fog, resulting in reduced bright-dark contrast and affecting the picture quality.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to provide an optical film piece that can promote the regional bright and dark contrast of the large visual angle of screen both sides.
The utility model discloses an optical diaphragm, including going into the light side and the light-emitting side relative with this income light side, this optical diaphragm separates into the middle zone along the direction of X axle and lies in two side districts of the both sides of this middle zone respectively, wherein, the light-emitting side in each this side district is arranged and is had a plurality of bar structures that are the bulge form, a plurality of bar structures are arranged along the direction of this X axle, and each this bar structure extends along the direction of the Y axle of this X axle of perpendicular to, each this bar structure includes the high microstructure of repeated arrangement and highly is less than the low microstructure of this high microstructure.
Another technical means of the present invention is that the number ratio of the high microstructure to the low microstructure is equal to 1 at the end of each side region far away from the middle region along the direction of the X axis.
The other technical means of the present invention lies in that a plurality of the strip-shaped structures are arranged on the light-emitting side of the middle area of the optical film, and each of the strip-shaped structures in the middle area includes the repeated arrangement of the high microstructures and the low microstructures that are lower than the high microstructures.
The other technical means of the present invention is that the number ratio of the high microstructure and the low microstructure in the middle area is equal to the number ratio of the high microstructure and the low microstructure in each of the side areas, both of which are equal to 1.
Another technical means of the present invention is that the number ratio of the high microstructure and the low microstructure is gradually increased from the center of the middle area along the direction of the X axis toward the side area.
Another technical means of the present invention is that the number of the high microstructures in each of the side regions does not exceed the number of the low microstructures at most.
Another technical means of the present invention is to define a center line passing through the vertex of any one of the low microstructures perpendicularly and a tangent line passing through the vertex and tangent to the adjacent high microstructures, wherein an acute angle between the center line and the tangent line is greater than or equal to 60 degrees.
Another technical means of the present invention is to arrange a plurality of the strip-shaped structures closely.
Another object of the present invention is to provide a backlight module.
The utility model discloses a backlight unit contains the light source, is used for receiving the optical plate of this light source, sets up the diaphragm group on this optical plate and sets up as before on this diaphragm group the optics diaphragm.
Another object of the present invention is to provide a display device.
The utility model discloses a display device contains as before backlight unit and sets up the display panel on this backlight unit, wherein, this X axle definition watches this display panel's horizontal direction for the user, and this Y axle definition watches this display panel's vertical direction for the user.
The utility model discloses an efficiency lies in, through the pattern and the arrangement of the strip structure on this optics diaphragm, can be with the light of too big angle refract once more, improves the problem of wide-angle light field and wide-angle light leak from this, and then improves the contrast at wide-angle visual angle.
Drawings
Fig. 1 is a schematic side view illustrating a preferred embodiment of a backlight module according to the present invention;
fig. 2 is a schematic perspective view illustrating the structure of the optical film of fig. 1;
FIG. 3 is a schematic side view of FIG. 2;
FIG. 4 is a graph illustrating the change in the ratio of high microstructure to low microstructure in an optical film;
FIG. 5 is a partially enlarged schematic view illustrating a partial structure of a high microstructure and a low microstructure;
FIG. 6 is a schematic side view of a preferred embodiment of a display device according to the present invention;
fig. 7 is a schematic view illustrating an angle when a user views a screen and a schematic view illustrating that a viewing surface and a light emitting surface are perpendicular to each other;
fig. 8 is a schematic view showing an angle when a user views a screen and a schematic view showing that an included angle between an ornamental surface and a light-emitting surface is 45 degrees;
FIG. 9 is a view illustrating the angle theta of 60 DEG,
A plot of the luminance percentage for different viewing angles at 0 degrees;
FIG. 10 is a view illustrating the angle theta of 60 DEG,
A plot of the luminance percentage for different viewing angles at 45 degrees;
FIG. 11 is a perspective view illustrating another aspect of an optical film;
FIG. 12 is a side view schematic diagram of FIG. 11 for aiding in the description; and
FIG. 13 is a graph illustrating the change in the ratio of high to low microstructures in the optical film of FIG. 11.
Detailed Description
The features and technical content of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings. Before proceeding with the detailed description, it should be noted that like elements are represented by like numerals.
Referring to fig. 1, a backlight module according to a preferred embodiment of the present invention includes a light source 2, an optical plate 3 for receiving the light source 2, a diaphragm set 4 disposed on the optical plate 3, and an optical diaphragm 5 disposed on the diaphragm set 4. The film set 4 may include a brightness enhancement film, a prism sheet, and a diffusion sheet, but not limited thereto. In the present embodiment, the backlight module is a direct type backlight module, and thus the light source 2 includes a plurality of Light Emitting Diodes (LEDs) arranged in an array under the bottom surface of the optical plate 3, and the optical plate 3 is a diffuser plate, so that light emitted from the LEDs arranged in the array is diffused by the optical composite material of the diffuser plate itself to generate a surface light source with uniformly distributed brightness. In other embodiments, the backlight module can be designed as a side-in type backlight module, so that the light source 2 includes a plurality of Light Emitting Diodes (LEDs) arranged in a linear manner at the side surface of the optical plate 3, and the optical plate 3 is a light guide plate, so that the light emitted by the LEDs enters the light guide plate through the side surface of the light guide plate, and then the total reflection path of the light in the light guide plate is destroyed through a special structure on the light guide plate, so as to generate a surface light source with uniformly distributed brightness.
Referring to fig. 2 and 3, the optical film 5 includes a light incident side 51 and a light emergent side 52 opposite to the light incident side 51. Since the optical film 5 is located above the optical plate 3, the light incident side 51 of the optical film 5 faces downward and faces the top surface (i.e., light exit surface) of the optical plate 3, and the light exit side 52 of the optical film 5 faces upward. The optical film 5 may be partitioned into a middle area 53 and two side areas 54 respectively located at both sides of the middle area 53 along the direction of the X-axis. Wherein, a plurality of protruding stripe structures 55 are arranged on the light-emitting side 52 of each side region 54. The plurality of stripe structures 55 are arranged along a direction of an X-axis, and each stripe structure 55 extends along a direction of a Y-axis perpendicular to the X-axis, and each stripe structure 55 includes a high microstructure 551 and a low microstructure 552 having a height lower than that of the high microstructure 551, which are repeatedly arranged. It is to be noted that the strip-like structures 55 are closely arranged without gaps therebetween.
In addition, in the present embodiment, the number of the high microstructures 551 in each side region 54 does not exceed the number of the low microstructures 552 at most, the light-emitting side 52 of the middle region 53 of the optical film 5 is also arranged with a plurality of protruding stripe structures 55, and the stripe structures 55 in the middle region 53 include a small number of high microstructures 551 and a large number of low microstructures 552 which are repeatedly arranged. That is, the number of high microstructures 551 does not exceed the number of low microstructures 552 at most, whether in the middle region 53 or in the side regions 54.
It is to be noted that, in the present embodiment, the high microstructures 551 and the low microstructures 552 are both circular protruding stripe structures, and the ratio of the number of the high microstructures 551 to the number of the low microstructures 552 increases from the center of the middle region 53 to the side regions 54 on both sides along the X-axis direction. The ratio of the number of high microstructures 551 to low microstructures 552 is equal to 1 at the extreme end of each side region 54 away from the central region 53 along the X-axis. That is, in the middle region 53, a plurality of low microstructures 552 are repeatedly arranged, and a high microstructure 551 is respectively arranged on both sides of the low microstructures 552, and the number of repetitions of the low microstructures 552 is gradually reduced from the middle region 53 to the side regions 54 on both sides. Taking fig. 2 and fig. 3 as an example, in the center of the middle region 53, the plurality of low microstructures 552 are repeatedly arranged, then one high microstructure 551 is respectively arranged on two sides of the plurality of low microstructures 552, four low microstructures 552 and one high microstructure 551 are continuously arranged towards two sides, three low microstructures 552 and one high microstructure 551 are continuously arranged towards two sides, the number of repetitions of the low microstructures 552 gradually decreases from the middle region 53 towards the side regions 54 on two sides until the number of repetitions of the high microstructures 551 and the low microstructures 552 is the same, so that the ratio of the two numbers is equal to 1, and thus as shown in fig. 4, the ratio of the high microstructures 551 and the low microstructures 552 gradually increases from less than 1 to equal to 1.
Next, the relationship between the height of the high microstructure 551 and the height of the low microstructure 552 will be described in detail. Referring to fig. 5, a center line L passing through the vertex of any one of the low microstructures 552 and a tangent line T passing through the vertex and tangent to the adjacent high microstructure 551 are defined, and an included angle between the center line L and the tangent line T is, for example, an acute angle of 60 degrees or more. In this embodiment, 60 degrees is taken as an example for explanation. Through the above structure design, when light is emitted through the low microstructure 552, the light with the light-emitting angle larger than 60 degrees is refracted again through the adjacent high microstructures 551 and enters the optical film 5, thereby reducing the chance of direct light emission and further reducing the light-emitting amount (luminance) in a large angle region. In other embodiments, the acute angle between the central line L and the tangent line T may be designed to be other angles, for example, 70 degrees, so that the light rays having the light exit angle greater than 70 degrees when exiting through the low microstructure 552 refract again into the optical film 5 through the adjacent high microstructure 551.
Referring to fig. 3 and 5, according to the preferred embodiment, when a small number of high microstructures 551 and a large number of low microstructures 552 are disposed on each side region 54, light emitted from a portion of the low microstructures 552 with a large angle can be refracted to enter the optical film 5 through the adjacent high microstructures 551. Since the two side regions 54 are prone to generate the light leakage phenomenon, the low microstructures 552 are designed at the extreme ends of the side regions 54 to match with the high microstructures 551, that is, the number ratio of the high microstructures 551 to the low microstructures 552 is equal to 1, so that the light emitted from each low microstructure 552 at a large angle can be refracted to enter the optical film 5, thereby reducing the chance of direct light emission. Therefore, the ratio of the number of the high microstructures 551 to the number of the low microstructures 552 is equal to 1, and is most suitable for the two side regions 54 where the light leakage phenomenon is easily generated.
The backlight module of the present invention, in addition to the display panel 6, forms the display device shown in fig. 6.
Next, the influence of the optical film 5 of the present invention on the light emitted at a large angle will be described. Referring to FIG. 7, plane A represents the light output of the display deviceThe plane B is perpendicular to the plane a, i.e., a viewing plane of a user when the display device is used, and is set such that an angle of view θ of the center C of eye view is 0 degree when the user faces the center C of the plane a. The X-axis is defined as the horizontal direction in which the user views the display device, and the Y-axis is defined as the vertical direction in which the user views the display device. In addition, the included angle between the plane B and the horizontal plane is defined as
In the context of figure 7 of the drawings,
is 0 degrees, while in figure 8,
45 degrees to simulate a reasonable range of angles for a user to actually view four corners or other edges of the screen. Fig. 9 and 10 illustrate the luminance percentages detected in fig. 7 and 8, where the solid line represents that the optical film 5 of the present invention is not used, and the dotted line represents that the optical film 5 of the present invention is used.
As can be seen from the detection results shown in fig. 9 and fig. 10, when the optical film 5 of the present invention is used, the light emitted from the light source at a large angle can be refracted by the adjacent high microstructures 551 (see fig. 5) to reduce the chance of direct light emission, so that the luminance of the region with the viewing angle of more than 60 degrees can be reduced, thereby effectively reducing the light leakage of the region with the viewing angle of more than 60 degrees, reducing the white fog on both sides of the display device, and further improving the contrast of the region with the viewing angle of more than 60 degrees. In FIG. 9
At 0 degree and of FIG. 10
Is 45 degrees, in the wide angle area of two visual angles between plus 60 degrees and plus 90 degrees and between minus 60 degrees and minus 90 degrees, it can be observed that the solid line part (not using the optical diaphragm 5 of the utility model) has more obvious existenceThis means that there is a light leakage phenomenon at a large angle of the viewing angle (30% -40% in fig. 9, and 20% -30% in fig. 10), and the dotted line portion (where the optical film 5 of the present invention is used) reduces the luminance to 20% or less, which means that the light leakage phenomenon at a large angle of the viewing angle has been improved.
Referring to fig. 3 and fig. 5, according to the preferred embodiment, when a small number of high microstructures 551 and a large number of low microstructures 552 are disposed on each side region 54, a portion of light emitted from the low microstructures 552 with a large angle can be refracted to enter the optical film 5 through the adjacent high microstructures 551. Since the light leakage phenomenon at the two side regions 54 with larger viewing angles is more obvious than that at the middle region 53, the light of the light emitted from the side regions 54 with large angles easily exceeds the viewing range of the user, and the light of the light emitted from the middle region 53 with large angles is still within the viewing range of the user, the preferred embodiment allows the light emitted from the middle region 53 with large angles, so that the number of the high microstructures 551 in the middle region 53 can be minimized, and only the problem of the light emitted from the two side regions 54 with large angles needs to be solved, and the number of the high microstructures 551 is gradually increased from the middle region 53 to the two side regions 54 in a gradual manner, so that the light of the light emitted from the low microstructures 552 in the two side regions 54 with large angles refracts into the optical film 5 through the adjacent high microstructures 551, thereby reducing the chance of direct light emission.
Referring to fig. 11 and 12, another optical film 5 different from that of fig. 2 is disclosed, in which the optical film 5 is arranged in the middle area 53 or the side area 54, and the high microstructures 551 and the low microstructures 552 are arranged in the same number in a staggered manner, i.e., in a repeated staggered manner. If it is desired that light exiting at a high angle from each of the low microstructures 552 refracts into the optical film 5, a design scheme of disposing one high microstructure 551 adjacent to one low microstructure 552 in a repeated arrangement may be adopted, that is, the number of high microstructures 551 is at most equal to the number of low microstructures 552, but not more than the number of low microstructures 552.
That is, as shown in fig. 13, the ratio of the number of high microstructures 551 to the number of low microstructures 552 in the middle region 53 is equal to the ratio of the number of high microstructures 551 to the number of low microstructures 552 in each side region 54, both of which are equal to 1. Therefore, besides the effect of refracting the light emitted from a large angle again, the optical film 5 is more convenient to cut after being manufactured, and has higher universality.
To sum up, the utility model discloses a strip structure 55's on the optical diaphragm 5 kenel and arrangement can be with the light refraction once more of too big angle, improve the problem of wide-angle light field and wide-angle light leak from this, and then improve the contrast at wide-angle visual angle.
The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention. Therefore, the scope of the invention is not limited by the claims and the description, but is also encompassed by the claims.
[ List of reference numerals ]
2 light source
3 optical plate
4 diaphragm group
5 optical film
51 incident light side
52 light exit side
53 middle zone
54 side zones
55 strip structure
551 high microstructure
552 low microstructure
6 display panel
L center line
T tangent line
Angle theta
Claims (10)
1. The optical film is characterized by comprising a light inlet side and a light outlet side opposite to the light inlet side, the optical film is partitioned into a middle area and two side areas respectively positioned at two sides of the middle area along the direction of an X axis, a plurality of protruding strip-shaped structures are arranged at the light outlet side of each side area, the strip-shaped structures are arranged along the direction of the X axis, each strip-shaped structure extends along the direction perpendicular to the Y axis of the X axis, and each strip-shaped structure comprises a high microstructure and a low microstructure which are repeatedly arranged and are lower than the high microstructure.
2. The optical film according to claim 1, wherein the ratio of the number of high microstructures to the number of low microstructures is equal to 1 at the extreme end of each of the side regions away from the middle region along the X-axis.
3. The optical film according to claim 2, wherein a plurality of the strip-shaped structures are arranged in a convex shape on the light-emitting side of the middle region of the optical film, and each of the strip-shaped structures in the middle region comprises the high microstructures and the low microstructures which are arranged repeatedly and have a height lower than that of the high microstructures.
4. The optical film according to claim 3, wherein the ratio of the number of the high microstructures to the number of the low microstructures in the middle region is equal to the ratio of the number of the high microstructures to the number of the low microstructures in each of the side regions, both of which are equal to 1.
5. The optical film according to claim 3, wherein the ratio of the number of high microstructures to the number of low microstructures increases from the center of the middle region toward the side regions along the X-axis.
6. The optical film according to claim 1, wherein the number of high microstructures in each of the side regions does not exceed the number of low microstructures at most.
7. The optical film according to claim 1, wherein a center line passing perpendicularly through the vertex of any one of the low microstructures and a tangent line passing through the vertex and tangent to the adjacent high microstructures are defined, and an acute angle between the center line and the tangent line is 60 degrees or more.
8. The optical film according to claim 1, wherein a plurality of the stripe structures are closely arranged.
9. A backlight module comprising a light source, an optical plate for receiving the light source, a film set disposed on the optical plate, and the optical film according to any one of claims 1 to 8 disposed on the film set.
10. A display device comprising the backlight module according to claim 9 and a display panel disposed on the backlight module, wherein the X-axis is defined as a horizontal direction in which a user views the display panel, and the Y-axis is defined as a vertical direction in which the user views the display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020612179.7U CN211786510U (en) | 2020-04-22 | 2020-04-22 | Optical film, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020612179.7U CN211786510U (en) | 2020-04-22 | 2020-04-22 | Optical film, backlight module and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211786510U true CN211786510U (en) | 2020-10-27 |
Family
ID=72958699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020612179.7U Active CN211786510U (en) | 2020-04-22 | 2020-04-22 | Optical film, backlight module and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211786510U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212376A1 (en) * | 2020-04-22 | 2021-10-28 | 瑞仪(广州)光电子器件有限公司 | Optical film, backlight module, and display device |
-
2020
- 2020-04-22 CN CN202020612179.7U patent/CN211786510U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212376A1 (en) * | 2020-04-22 | 2021-10-28 | 瑞仪(广州)光电子器件有限公司 | Optical film, backlight module, and display device |
| US11320580B2 (en) | 2020-04-22 | 2022-05-03 | Radiant (Guangzhou) Opto-Electronics Co. Ltd. | Light directing sheet, backlight module, and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7990490B2 (en) | Optical sheet and display device having the same | |
| KR101126058B1 (en) | Surface light source device, lighting unit and material for controlling a velocity of light | |
| CN1878984B (en) | Surface light source device and apparatus using this device | |
| CN107003557B (en) | Direct-view display device and light unit for direct-view display device | |
| KR100951723B1 (en) | Optical sheet for back light unit | |
| US7806567B2 (en) | Diffuser plate with cambered and prismatic microstructures and backlight using the same | |
| KR100864321B1 (en) | Diffuser prism sheet comprising amorphous light diffuser on the valley of prism and lcd back light unit thereby | |
| KR100665871B1 (en) | Back light assembly of liquid crystal display | |
| JP6123678B2 (en) | LIGHTING DEVICE AND DISPLAY DEVICE HAVING LIGHTING DEVICE | |
| JP5397572B1 (en) | Illumination device and display device | |
| JP5526763B2 (en) | Illumination device and display device provided with concealment structure | |
| CN102282415A (en) | Light guiding body, concealment structure, and lighting device and display apparatus provided with same | |
| JP2010055057A (en) | Liquid crystal display apparatus | |
| JP2006337526A (en) | Optical film, back light system, and liquid crystal display | |
| CN218383371U (en) | Backlight module with multiple cone-shaped structures designed on optical film and display device | |
| JPH10301110A (en) | Picture display device | |
| CN211786510U (en) | Optical film, backlight module and display device | |
| CN103900033A (en) | Light guide plate and backlight module | |
| CN113906338A (en) | Optical film, backlight module and display device | |
| JP2006202559A (en) | Surface light source apparatus | |
| KR101472338B1 (en) | Backlight Unit | |
| JP2011060455A (en) | Lighting unit, and display device | |
| WO2019187462A1 (en) | Plane-shaped lighting device | |
| KR100599514B1 (en) | Sheet assembly of a back light unit for liquid crystal display device | |
| JP5223408B2 (en) | Optical sheet, backlight unit and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |