CN212846262U - Brightness enhancement film of backlight unit, backlight unit and fingerprint identification display screen - Google Patents
Brightness enhancement film of backlight unit, backlight unit and fingerprint identification display screen Download PDFInfo
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- CN212846262U CN212846262U CN202020479917.5U CN202020479917U CN212846262U CN 212846262 U CN212846262 U CN 212846262U CN 202020479917 U CN202020479917 U CN 202020479917U CN 212846262 U CN212846262 U CN 212846262U
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Abstract
The embodiment of the utility model provides a backlight unit's brightness enhancement piece, backlight unit and fingerprint identification display screen, wherein the upper surface and the lower surface of brightness enhancement piece are the smooth surface, and the brightness enhancement piece includes the euphotic layer of the different refracting indexes of a plurality of layers for with the light refraction that produces in the backlight unit for the light that jets out on the vertical direction, there is the cubic of arrangement rule to be protruding on the upper surface of brightness enhancement piece and/or the lower surface. The backlight source is refracted to be a vertical light source by adopting a plurality of layers of light-transmitting materials with different refractive indexes, so that a prismatic sawtooth structure on the upper surface of the original brightness enhancement sheet can be eliminated, the problem that vertical incident light is refracted is avoided, and meanwhile, the surface of the light-transmitting sheet is provided with block-shaped protrusions with regular arrangement, so that the problem that the brightness enhancement sheet, the liquid crystal panel on the upper layer and the diffusion sheet on the lower layer are adsorbed by a mirror surface to generate water ripples can be avoided.
Description
Technical Field
The embodiment of the utility model provides a relate to liquid crystal display technical field, particularly, relate to a brightness enhancement piece, backlight unit and fingerprint identification display screen.
Background
Along with the gradual increase of the screen occupation ratio of the display screen on the intelligent mobile phone, the installation area of the fingerprint identification module is obviously occupied, the fingerprint identification module which can be installed below the display screen before is forced to be installed on the back of the intelligent mobile phone, and the unity and the attractiveness of the back of the intelligent mobile phone are affected, so that each manufacturer starts to transfer the eye to how to realize the fingerprint identification under the screen, the fingerprint identification under the screen is realized on an OLED screen at present, because the display substrate of the OLED screen is thin and has the self-luminous characteristic, part of visible light can directly penetrate through the display screen substrate, and the fingerprint pattern above the screen is directly collected by the image collection module arranged below the display substrate.
The method cannot be applied to the existing liquid crystal display, the liquid crystal display needs the backlight module to provide an independent backlight source for the liquid crystal panel, the backlight module cannot be directly punched to enable visible light to directly penetrate through the liquid crystal display to realize the identification of the fingerprint under the screen, and in order to enable light to penetrate through the thicker liquid crystal display to realize the identification of the fingerprint under the screen, only an infrared light scheme can be selected at present, namely infrared light is adopted to directly penetrate through the liquid crystal display to realize the identification of the fingerprint under the screen. However, in the existing backlight module, since the prism structure on the upper surface of the brightness enhancement film plays a role of refracting the light path, and the prism structure also causes the infrared light vertically incident into the brightness enhancement film to be refracted, the infrared light cannot return to the original light path, and the specific schematic diagram can be shown in fig. 1. Thus, the presence of the prismatic structures greatly reduces the accuracy and precision of the underscreen fingerprint identification.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a brightness enhancement piece, backlight unit and fingerprint identification display screen solves the infrared ray that the brightness enhancement piece can refract the vertical injection among the prior art backlight unit, leads to the problem that fingerprint identification accuracy and the degree of accuracy reduce under the screen.
In order to solve the above problem, the embodiment of the utility model provides a backlight unit's brightness enhancement piece, the upper surface of brightness enhancement piece is the smooth surface, the brightness enhancement piece includes the euphotic layer of the different refracting indexes of a plurality of layers, be used for with the light that produces among the backlight unit refracts for the light that jets out in the vertical direction, the upper surface of brightness enhancement piece still distributes and has the cubic of arrangement rule to be protruding.
Optionally, when the lower surface of the brightness enhancement sheet is a smooth surface, block-shaped protrusions aligned with the upper surface and arranged regularly are distributed on the lower surface of the brightness enhancement sheet.
Optionally, the multiple light transmitting layers of the brightness enhancement film are combined together in a pressing manner.
Optionally, the block-shaped protrusion is a quadrilateral block-shaped protrusion, and includes any one of a square protrusion and a rectangular protrusion.
Optionally, when the square bumps are arranged, the height of each square bump is 0.001MM-0.003MM, the width of each square bump is 0.05MM-0.15MM, and the distance between adjacent squares is half of the width of each square bump.
Optionally, when the rectangular blocks protrude, the height of the rectangular block protrusion is 0.001MM-0.003MM, the width of the rectangular block is 0.05MM-0.15MM, the length of the rectangular block is twice of the width of the rectangular block, and the distance between adjacent rectangular blocks is half of the width of the rectangular block.
Optionally, the light-increasing sheet further includes at least one through hole and/or at least one notch formed in an edge.
Optionally, the through hole is formed at a position of the brightness enhancement film close to the side edge or the corner, and the through hole is a circular through hole or a runway-shaped through hole;
the notch is a U-shaped notch or a semicircular notch.
Further, the embodiment of the utility model provides a backlight module is still provided, backlight module is including the protection frame, and sets up upwards reflector plate, light guide plate, diffusion piece and the above-mentioned arbitrary one of arranging in proper order in the protection frame the brightness enhancement piece, and fix on the lateral wall in the protection frame with the light source of light guide plate same position.
Furthermore, the embodiment of the present invention further provides a fingerprint identification display screen, where the fingerprint identification display screen includes the backlight module, a liquid crystal panel and an infrared identifier, and the liquid crystal panel is disposed above the front side of the backlight module; the infrared identifier is fixed on the back of the backlight module and used for penetrating through the backlight module and the liquid crystal panel to identify the infrared information of the fingerprint.
The embodiment of the utility model provides a beneficial effect is:
the embodiment of the utility model provides a brightness enhancement piece, backlight unit and fingerprint identification display screen, wherein the upper surface of brightness enhancement piece is the smooth surface, and the brightness enhancement piece includes the euphotic layer of the different refracting indexes of a plurality of layers for with the light refraction that produces in the backlight unit for the light that jets out on the vertical direction, the upper surface of brightness enhancement piece still distributes and has the cubic of arrangement rule to be protruding. The backlight source is refracted to a vertical light source by adopting a plurality of layers of light-transmitting materials with different refractive indexes, so that the prism structure of the upper surface of the original brightness enhancement sheet can be eliminated, the problem that vertical incident light is refracted is avoided, and meanwhile, block-shaped bulges with regular arrangement are distributed on the upper surface of the brightness enhancement sheet, so that the problem that the display effect is influenced by water ripples due to mirror surface adsorption between the brightness enhancement sheet and the upper liquid crystal panel can be avoided.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic view of a conventional backlight module and a schematic view of refraction of light;
fig. 2 is a schematic view illustrating a structure and a light refraction path of a backlight module according to this embodiment;
fig. 3 is a schematic partial enlarged view of the upper surface of the brightness enhancement film provided in this embodiment;
FIG. 4 is a schematic partial enlarged view of a brightness enhancement film with a square protrusion surface according to the present embodiment;
FIG. 5 is a schematic partial enlarged view of a brightness enhancement film with rectangular protrusions provided in this embodiment;
FIG. 6 is a schematic diagram of two brightness enhancement films provided in this embodiment;
fig. 7 is a schematic structural diagram of a fingerprint identification display screen provided in this embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments, not all embodiments, in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The present invention will now be further explained by way of the detailed description in conjunction with the drawings.
The first embodiment is as follows:
the embodiment provides a brightness enhancement film of a backlight module, wherein the upper surface of the brightness enhancement film is a smooth surface, the brightness enhancement film comprises a plurality of light transmission layers with different refractive indexes, the light transmission layers are used for refracting light rays generated in the backlight module into light rays emitted in the vertical direction, and block-shaped bulges with regular arrangement are further distributed on the upper surface of the brightness enhancement film.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic view of a structure and a light refraction path of a backlight module according to the present embodiment, and fig. 3 is a schematic view of a surface structure of a brightness enhancement film according to the present embodiment. It should be noted that, in practical applications, the brightness enhancement film is composed of tens of transparent layers, hundreds of transparent layers, and even thousands of transparent layers, so that the layered structure thereof cannot be clearly seen, the actual side view is closer to the bottom view in fig. 3, and the layering in fig. 2 is an adjustment for easy demonstration; since the height of the block-shaped protrusions is 0.001MM to 0.003MM, which is hardly visible in a side view of the entire backlight unit, the structure of the block-shaped protrusions is not visible in the upper and lower surfaces of the brightness enhancement sheet of fig. 2, and is visible only in a partially enlarged view of fig. 3.
In fig. 2, the backlight module includes: the light-intensifying plate 206 in fig. 2 includes two lead wires of the light-intensifying plate 206 and a light-transmitting layer between the lead wires, the light-transmitting layer is a light-transmitting film made of a light-transmitting material, such as a light-transmitting film made of pet (polyethylene terephthalate) polyester resin, because the existing prism structure is eliminated on the light-intensifying plate 206, the upper surface of the light-intensifying plate 206 is a smooth surface, in order to realize the refraction effect of the original light-intensifying plate, the light generated by the light source 204 in the backlight module is refracted into a light ray emitted vertically upwards by refraction of each layer of the light-transmitting material, the specific light path can be seen in D, E, J in fig. 2, the light source 204 generates visible light to be emitted into the light guide plate 203, the visible light is reflected upwards to the light-diffusing plate 205 and the light-intensifying plate 206 through the reflecting plate 202 under the light guide plate 203, the light is finally refracted by the brightness enhancement film 206 to be emitted upward at a vertical angle. The brightness enhancement film 206 has a smooth upper surface without prism structure, so that it does not generate refraction effect to the light incident vertically upwards. It should be noted that the brightness enhancement film of the present embodiment changes the light path direction through the light-transmitting layers with different refractive indexes, so that the refractive index of each layer of light-transmitting material and the number of layers of light-transmitting material can be changed according to the actual wavelength of light, and the specific number of layers can be tens of layers, hundreds of layers, or even thousands of layers; the multiple light transmission layers can be combined together in a pressing mode to form the brightness enhancement film. The lamination process is to place several layers of light-transmitting materials with different refractive indexes one by one in an overlapping manner, and combine the several layers of light-transmitting materials into a whole in a manner of extrusion and glue adhesion.
Fig. 3 is a front view and a bottom view of a brightness enhancement film, in practical application, we find that, on the basis of the brightness enhancement film, if the surface of the brightness enhancement film is smooth, mirror surface adsorption easily occurs between the upper surface of the brightness enhancement film and an upper layer liquid crystal module, and when the mirror surface adsorption occurs on two surfaces, a water ripple phenomenon is generated, which affects the light uniformity of a backlight module and affects the display effect of a display screen.
In this embodiment, when the lower surface of the brightness enhancement sheet is a smooth surface, block-shaped protrusions aligned with the upper surface and arranged regularly are distributed on the lower surface of the brightness enhancement sheet.
In the conventional intensifying chip, besides the prism structure on the upper surface, a shallow rough structure is formed on the lower surface to play a certain role in dispersing light, and the refractive power of the rough structure to light, particularly the refractive power of the light in the vertical direction is relatively weak, so that the lower surface is not required to be improved under the condition of considering the cost. However, in order to realize a better screen fingerprint identification effect, the rough structure of the lower surface can be eliminated and modified into a smooth surface which is the same as the upper surface, and block-shaped bulges which are aligned with the upper surface and are regularly arranged are also distributed on the smooth surface, so that the refraction of the light intensifying layer to vertical light rays is thoroughly avoided. A detailed schematic can be seen in fig. 4.
In the present embodiment, the block-shaped protrusion is a quadrangular block-shaped protrusion including any one of a square protrusion and a rectangular protrusion. The main function of the block-shaped protrusion is to avoid the occurrence of mirror surface adsorption, so the specific shape of the block-shaped protrusion can be any shape in principle, but from the viewpoint of practical production, it is a relatively conventional solution to arrange the block-shaped protrusion as a quadrangular block-shaped protrusion, and among the quadrangular block-shaped protrusions, a square protrusion and a rectangular protrusion are relatively common and easily realized shapes.
In the present embodiment, when the square protrusions are formed, the height of the square protrusions is 0.001MM to 0.003MM, the width of the square protrusions is 0.05MM to 0.15MM, and the distance between adjacent squares is half of the width of the square protrusions. Referring to fig. 4, fig. 4 is a partial enlarged view of a bottom view of a brightness enhancement film with square protrusions on the surface, where in fig. 4, a is the height of the square protrusions 0.001MM to 0.003MM, B is the width of the square protrusions 0.05MM to 0.15MM, and C is the distance between two adjacent squares half the width of the square protrusions B. It should be noted that the above given numerical values are all interval values, and in practical applications, specific values may be within the above intervals.
In the present embodiment, when rectangular blocks are protruded, the height of the rectangular block protrusion is 0.001MM-0.003MM, the width of the rectangular block is 0.05MM-0.15MM, the length of the rectangular block is twice the width of the rectangular block, and the distance between adjacent rectangular blocks is half the width of the rectangular block. Referring to fig. 5, fig. 5 is a partial enlarged view of rectangular protrusions on a surface of a brightness enhancement film provided in the present embodiment, in fig. 5, a is a height of the rectangular protrusions is 0.001MM to 0.003MM, C is a width of the rectangular protrusions is 0.05MM to 0.15MM, a length B of the rectangular protrusions is twice a width C of the rectangular protrusions, and D and E are both half of a distance between two adjacent rectangular protrusions. It should be noted that the above given numerical values are all interval values, and in practical applications, specific values may be within the above intervals.
The embodiment provides a brightness enhancement film in a backlight module, wherein the upper surface of the brightness enhancement film is a smooth surface, the brightness enhancement film comprises a plurality of light transmission layers with different refractive indexes, the light transmission layers are used for refracting light generated in the backlight module into light emitted in the vertical direction, and block-shaped bulges with regular arrangement are arranged on the upper surface and/or the lower surface of the brightness enhancement film. The brightness enhancement film made of a plurality of layers of light-transmitting materials with different refractive indexes realizes that light rays are refracted to the vertical direction in the backlight module, the problem that the original brightness enhancement film shows the refraction of a prism structure to vertical incident light rays is solved, and meanwhile, the surface of the brightness enhancement film is also provided with regularly arranged block-shaped bulges, so that the problem that the brightness enhancement film, an upper liquid crystal panel and a lower diffusion film are adsorbed by a mirror surface to generate water ripples can be avoided.
Example two:
the embodiment provides another brightness enhancement film, and the brightness enhancement film is further expanded on the basis of the first embodiment. The light increasing sheet also comprises at least one through hole and/or at least one notch arranged on the edge. Specifically, referring to fig. 6, fig. 6 is a schematic view of two kinds of brightness enhancement films provided in this embodiment, where 6-1 is a schematic view of forming a through hole on a brightness enhancement film, and 6-2 is a schematic view of forming a notch on an edge of the brightness enhancement film. It can be understood that the shape of the through hole and the shape of the notch may be changed according to actual situations, the opening position may also be changed according to actual situations in addition to the illustrated position, and the number of openings and the combination relationship between the two may also be changed according to actual situations, which is not limited in this embodiment.
In this embodiment, the through hole is formed at a position of the brightness enhancement film near the side edge or the corner, and the through hole is a circular through hole or a racetrack-type through hole. The notch is a U-shaped notch or a semicircular notch. Along with the further increase of screen occupation of ratio, the screen has not only crowded occupation of original fingerprint identification's mounted position, still crowded occupation of the mounted position of assemblies such as original leading camera and distance sensor, consequently in order to realize installing assemblies such as leading camera and distance sensor in the screen, we need trompil in liquid crystal module's backlight unit and be used for installing the subassembly that corresponds, perhaps need the trompil in the light intensifying piece that corresponds, specific through-hole is common to be more with circular and runway type, the breach is more with U-shaped breach or semi-circular breach.
The embodiment provides a brightness enhancement film, on the basis of the first embodiment, a through hole is further formed in the brightness enhancement film and/or a notch is formed in the edge of the brightness enhancement film, and the through hole and the notch can be used for mounting components such as a front camera and a distance sensor.
EXAMPLE III
The embodiment also provides a backlight module, which comprises a protective outer frame, a reflecting sheet, a light guide plate, a diffusion sheet, a brightness enhancement sheet and a light source, wherein the reflecting sheet, the light guide plate, the diffusion sheet and the brightness enhancement sheet are arranged in the protective outer frame in sequence from top to bottom, and the light source is fixed on the side wall in the protective outer frame and is at the same position as the light guide plate. See fig. 2 in particular.
The embodiment also provides a fingerprint identification display screen, which comprises the backlight module, a liquid crystal panel and an infrared identifier, wherein the liquid crystal panel is arranged above the front side of the backlight module; the infrared identifier is fixed on the back of the backlight module and used for penetrating through the backlight module and the liquid crystal panel to identify the infrared information of the fingerprint.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a fingerprint identification display screen provided in this embodiment. This fingerprint identification display screen includes: the protection frame 201, the reflector plate 202, the light guide plate 203, the light source 204, the diffusion sheet 205, the brightness enhancement sheet 206, the infrared identifier 701, the liquid crystal panel 702 and the user fingerprint 703, the liquid crystal panel 702 is arranged above the front face of the backlight module, the infrared identifier 701 is fixed on the back face of the backlight module, when the infrared identifier 701 works, infrared light is emitted to penetrate through the backlight module and the liquid crystal panel 702 and is reflected back to the infrared identifier 701 from the user fingerprint 703, and the infrared identifier 701 determines whether the user is an authorized user or not through infrared information of the identified fingerprint.
This embodiment provides a backlight unit and fingerprint identification display screen, including implementing the brightness enhancement piece in one and the embodiment two in this backlight unit, avoided the problem of being refracted when perpendicular light passes the brightness enhancement piece, adopted above-mentioned backlight unit in the fingerprint identification display screen, realized liquid crystal display screen under the screen discernment user's infrared fingerprint information.
As can be seen from the above three embodiments, the embodiments of the present invention have many combinations, and the above description is only the preferred embodiments of the present invention, and the description thereof is specific and detailed, but cannot be understood as the limitation of the scope of the embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the embodiments of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the embodiments of the present invention.
Claims (10)
1. The brightness enhancement sheet of the backlight module is characterized in that the upper surface of the brightness enhancement sheet is a smooth surface, the brightness enhancement sheet comprises a plurality of light transmission layers with different refractive indexes and is used for refracting light rays generated in the backlight module into light rays emitted in the vertical direction, and block-shaped bulges with regular arrangement are further distributed on the upper surface of the brightness enhancement sheet.
2. The light-intensifying sheet of claim 1, wherein when the lower surface of the light-intensifying sheet is smooth, regularly arranged block-shaped protrusions aligned with the upper surface are distributed on the lower surface of the light-intensifying sheet.
3. The brightness enhancement sheet according to claim 1, wherein the plurality of light transmission layers of the brightness enhancement sheet are bonded together by pressing.
4. The brightness enhancement sheet according to claim 2, wherein the block-shaped protrusions are quadrilateral block-shaped protrusions including any one of square block-shaped protrusions and rectangular block-shaped protrusions.
5. The brightness enhancement sheet according to claim 4, wherein when the block-shaped protrusions are the square protrusions, the square protrusion height is 0.001MM to 0.003MM, the square width is 0.05MM to 0.15MM, and the distance between adjacent squares is half of the square width.
6. The brightness enhancement sheet according to claim 4, wherein when the block-shaped protrusions are the rectangular protrusions, the rectangular protrusion height is 0.001MM to 0.003MM, the rectangular block width is 0.05MM to 0.15MM, the rectangular block length is twice the rectangular block width, and the distance between adjacent rectangular blocks is half the rectangular block width.
7. The brightness enhancement sheet according to any one of claims 1 to 6, further comprising at least one through hole and/or at least one notch formed in a side edge.
8. The brightness enhancement sheet according to claim 7, wherein the through hole is formed at a position close to a side edge or a corner of the brightness enhancement sheet, and the through hole is a circular through hole or a racetrack-type through hole;
the notch is a U-shaped notch or a semicircular notch.
9. A backlight module is characterized in that the backlight module comprises a protective outer frame, a reflecting sheet, a light guide plate, a diffusion sheet, a brightness enhancement sheet as claimed in any one of claims 1 to 8 and a light source, wherein the reflecting sheet, the light guide plate and the diffusion sheet are arranged in the protective outer frame in sequence from top to bottom, and the light source is fixed on the inner side wall of the protective outer frame and corresponds to the light guide plate.
10. A fingerprint identification display screen, characterized in that, the fingerprint identification display screen comprises the backlight module as claimed in claim 9, a liquid crystal panel and an infrared identifier, the liquid crystal panel is arranged above the front of the backlight module; the infrared identifier is fixed on the back of the backlight module and used for penetrating through the backlight module and the liquid crystal panel to identify the infrared information of the fingerprint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020479917.5U CN212846262U (en) | 2020-04-03 | 2020-04-03 | Brightness enhancement film of backlight unit, backlight unit and fingerprint identification display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020479917.5U CN212846262U (en) | 2020-04-03 | 2020-04-03 | Brightness enhancement film of backlight unit, backlight unit and fingerprint identification display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212846262U true CN212846262U (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020479917.5U Expired - Fee Related CN212846262U (en) | 2020-04-03 | 2020-04-03 | Brightness enhancement film of backlight unit, backlight unit and fingerprint identification display screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212846262U (en) |
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2020
- 2020-04-03 CN CN202020479917.5U patent/CN212846262U/en not_active Expired - Fee Related
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Effective date of registration: 20210902 Address after: 243071 No. 636, Longshan Road, Ma'anshan economic and Technological Development Zone, Ma'anshan City, Anhui Province Patentee after: MAANSHAN DACANG PRECISION TECHNOLOGY Co.,Ltd. Address before: 518000. E building, Shiyan Industrial Street, Fukang mountain area, Shiyan City, Shenzhen, Guangdong, Baoan District Patentee before: SHENZHEN TECHASER TECHNOLOGIES Co.,Ltd. |
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Granted publication date: 20210330 |