CN212846263U - Diffusion piece, backlight unit and fingerprint identification display screen - Google Patents
Diffusion piece, backlight unit and fingerprint identification display screen Download PDFInfo
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- CN212846263U CN212846263U CN202020479921.1U CN202020479921U CN212846263U CN 212846263 U CN212846263 U CN 212846263U CN 202020479921 U CN202020479921 U CN 202020479921U CN 212846263 U CN212846263 U CN 212846263U
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- diffusion sheet
- diffusion
- protrusions
- backlight module
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- 239000003292 glue Substances 0.000 description 1
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- 229920001225 polyester resin Polymers 0.000 description 1
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Abstract
The embodiment of the utility model provides a diffusion piece, backlight unit and fingerprint identification display screen, wherein the upper surface and/or the lower surface of diffusion piece are the smooth surface, and the diffusion piece includes the euphotic layer of a plurality of layers of different refracting indexes, and still distributes on the upper surface and/or the lower surface of diffusion piece and have the cubic of arranging the rule to be protruding. The light-transmitting materials with different refractive indexes are adopted to achieve the effects of refraction and scattering backlight sources, irregular refraction and scattering of upper and lower diffusion particle layers are avoided, the problems of refraction and scattering of vertical light are caused, and block-shaped protrusions with regular arrangement are distributed on the upper surface and/or the lower surface of the diffusion sheet, so that the problems that the diffusion sheet, an upper brightness enhancement sheet and a lower light guide plate are subjected to mirror surface adsorption, and the display effect is influenced by water ripples are solved.
Description
Technical Field
The embodiment of the utility model provides a relate to liquid crystal display technical field, particularly, relate to a diffusion 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 current backlight module, the upper and lower surfaces of the diffusion sheet are both provided with a particle diffusion layer to achieve the effects of light scattering and refraction, and because the existence of the upper and lower particle diffusion layers can cause the infrared light vertically upwards to be refracted and scattered, as can be seen from fig. 1, the refraction of the diffusion sheet can cause the accuracy and the accuracy of fingerprint identification under the screen to be greatly reduced.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a diffusion piece, backlight unit and fingerprint identification display screen, the infrared ray that diffusion piece can scatter and refract and kick into perpendicularly among the solution 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, an embodiment of the present invention provides a diffusion sheet, an upper surface and/or a lower surface of the diffusion sheet are smooth surfaces, the diffusion sheet includes a plurality of euphotic layers with different refractive indexes, and block-shaped protrusions with regular arrangement are further distributed on the upper surface and/or the lower surface of the diffusion sheet.
Optionally, when the upper surface or the lower surface of the diffusion sheet is a smooth surface, a layer of diffusion particle layer is distributed on the lower surface or the upper surface.
Optionally, the diffusion sheet includes a plurality of light transmission layers with different refractive indexes, and the plurality of light transmission layers 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 the side 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 reflector plate, light guide plate, diffusion piece and the piece of adding lustre to upwards arranging in proper order in the protection frame, 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 diffusion piece, backlight unit and fingerprint identification display screen, wherein the upper surface and/or the lower surface of diffusion piece are the smooth surface, and the diffusion piece includes the euphotic layer of a plurality of layers of different refracting indexes, and still distributes on the upper surface and/or the lower surface of diffusion piece and have the cubic of arranging the rule to be protruding. The light-transmitting materials with different refractive indexes are adopted to achieve the effects of refraction and scattering backlight sources, irregular refraction and scattering of upper and lower diffusion particle layers are avoided, the problems of refraction and scattering of vertical light are caused, and block-shaped protrusions with regular arrangement are distributed on the upper surface and/or the lower surface of the diffusion sheet, so that the problems that the diffusion sheet, an upper brightness enhancement sheet and a lower light guide plate are subjected to mirror surface adsorption, and the display effect is influenced by water ripples are solved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic enlarged view of a conventional diffuser plate;
fig. 2 is a schematic view of a partial structure of a backlight module according to an embodiment of the present invention;
fig. 3 is a front view and a partial enlarged bottom view of a diffusion sheet according to an embodiment of the present invention;
fig. 4 is a partially enlarged view of a bottom view of another diffusion sheet according to an embodiment of the present invention;
fig. 5 is a partial enlarged view of a bottom view of a diffusion sheet with square protrusions on its surface according to an embodiment of the present invention;
FIG. 6 is a partial enlarged view of a rectangular protrusion on a surface of a diffusion sheet according to an embodiment of the present invention;
fig. 7 is a schematic view of two diffusion sheets according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a fingerprint identification display screen according to an embodiment of the present invention.
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 diffusion sheet, wherein the upper surface and/or the lower surface of the diffusion sheet is a smooth surface, the diffusion sheet comprises a plurality of light transmission layers with different refractive indexes, and block-shaped protrusions which are regularly arranged are distributed on the upper surface and/or the lower surface of the diffusion sheet.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic view of a partial structure of a backlight module according to the present embodiment, and fig. 3 is a partial enlarged view of a front view and a bottom view of a diffusion sheet according to the present embodiment. It should be noted that in practical applications, the diffusion sheet is composed of tens, hundreds, or even thousands of light-transmitting 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 adjusted for convenience of illustration; 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.
Fig. 2 includes a protective outer frame 201, a reflective sheet 202, a light guide plate 203, a light source 204 and a diffusion sheet 205, wherein the diffusion sheet 205 is composed of several transparent layers with different refractive indexes, the diffusion sheet in FIG. 2 includes two lead lines of 205 and a transparent layer between the lead lines, the transparent layer is a transparent film made of a transparent material, such as a light-transmitting film made of pet (polyethylene terephthalate) polyester resin, in order to realize the refraction effect of the original diffusion sheet, the light generated by the light source 204 in the backlight module is refracted by each layer of light-transmitting material into light emitted upward in the positive direction, the specific light path can be shown as 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 upward to the diffusion sheet 205 through the reflective sheet 202 under the light guide plate 203, and the light is refracted by the diffusion sheet 205 into a forward direction and emitted upward. It should be noted that the light path direction of the diffusion sheet of this embodiment is changed by the light-transmitting layers with different refractive indexes, so 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 light transmission layers can be combined together in a pressing mode to form the diffusion sheet. 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.
Because this diffusion piece that implements cancels the diffusion grained layer of the upper and lower surface of original diffusion piece for upper and lower surface becomes the smooth surface, this upper surface that leads to the diffusion piece easily and the brightness enhancement piece on upper strata appear mirror surface and adsorb, the lower surface of diffusion piece and the light guide plate of lower floor appear mirror surface and adsorb, appear mirror surface adsorption effect and can produce water ripple on the adsorption plane, water ripple can influence effect in a poor light and final display effect. In order to overcome this problem, the upper and lower surfaces of the diffusion sheet provided in this embodiment are uniformly distributed with regularly arranged block-shaped protrusions, as shown in fig. 3, the regularly arranged block-shaped protrusions are distributed on the smooth surface, so that mirror surface adsorption can be avoided, water ripples are not generated, and the block-shaped protrusions are platform-shaped protrusions, so that no refraction effect is generated on vertically upward light.
In this embodiment, when the upper surface or the lower surface of the diffusion sheet is a smooth surface, a layer of diffusion particle layer is distributed on the lower surface or the upper surface.
Referring to fig. 4, fig. 4 is a partially enlarged view of a bottom view of another diffusion sheet provided in the present embodiment. In this embodiment, the diffusion sheet may have both the upper surface and the lower surface smooth, or may have either the upper surface or the lower surface smooth, and one side of the smooth surface may also have regularly arranged block-shaped protrusions distributed thereon, while the other side may have a diffusion particle layer thereon.
In the present embodiment, the block-shaped protrusions are quadrangular block-shaped protrusions including any one of square protrusions and rectangular protrusions. 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. 5, fig. 5 is a partial enlarged view of a bottom view of a diffusion sheet with a surface of square protrusions provided in the present embodiment, in fig. 5, a is a height of the square protrusions of 0.001MM to 0.003MM, B is a width of the square protrusions of 0.05MM to 0.15MM, and C is a distance between two adjacent squares of half of the width B of the square. 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. 6, fig. 6 is a partial enlarged view of a rectangular protrusion on a surface of a diffusion sheet provided in the present embodiment, in fig. 6, a is a height of the rectangular protrusion is 0.001MM to 0.003MM, C is a width of the rectangular protrusion is 0.05MM to 0.15MM, a length B of the rectangular protrusion is twice a width C of the rectangular protrusion, 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 of the utility model provides a diffusion piece, the upper surface and/or the lower surface of diffusion piece are the smooth surface, and the diffusion piece includes the euphotic layer of a plurality of layers different refracting indexes, and still distributes on the upper surface and/or the lower surface of diffusion piece and have the cubic of arranging the rule to be protruding. The light-transmitting materials with different refractive indexes are adopted to achieve the effects of refraction and scattering backlight sources, irregular refraction and scattering of upper and lower diffusion particle layers are avoided, the problems of refraction and scattering of vertical light are caused, and block-shaped protrusions with regular arrangement are distributed on the upper surface and/or the lower surface of the diffusion sheet, so that the problems that the diffusion sheet, an upper brightness enhancement sheet and a lower light guide plate are subjected to mirror surface adsorption, and the display effect is influenced by water ripples are solved.
Example two:
the present embodiment provides another diffusion sheet, which is a further extension of the first embodiment. The diffusion sheet also comprises at least one through hole and/or at least one notch arranged on the edge. Specifically, referring to fig. 7, fig. 7 is a schematic view of two diffusion sheets provided in this embodiment, where 7.1 is a schematic view of forming through holes on the diffusion sheets, and 7.2 is a schematic view of forming notches on side edges of the diffusion sheets. 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 diffusion sheet, on the basis of the first embodiment, the diffusion sheet is further provided with a through hole and/or a notch at the edge of the diffusion sheet, and the through hole and the notch can be used for installing 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 in particular fig. 8.
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. 8, fig. 8 is a schematic structural diagram of a fingerprint identification display screen provided in this embodiment. This fingerprint identification display screen includes: the backlight module comprises a protective outer frame 201, a reflector plate 202, a light guide plate 203, a light source 204, a diffusion sheet 205, a brightness enhancement sheet 206, an infrared identifier 801, a liquid crystal panel 802 and a user fingerprint 803, wherein the liquid crystal panel 802 is arranged above the front face of the backlight module, the infrared identifier 801 is fixed on the back face of the backlight module, when the infrared identifier 801 works, infrared light is emitted to penetrate through the backlight module and the liquid crystal panel 802 and is reflected back to the infrared identifier 801 from the user fingerprint 803, and the infrared identifier 801 determines whether a 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, and this backlight unit has included the diffusion piece of implementing in one and the second embodiment, has avoided the problem of being refracted when perpendicular light passes the diffusion piece, has adopted above-mentioned backlight unit in the fingerprint identification display screen, has realized liquid crystal display screen discernment user's infrared fingerprint information under the screen.
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 diffusion sheet is applied to a backlight module and is characterized in that the upper surface and/or the lower surface of the diffusion sheet is a smooth surface, the diffusion sheet comprises a plurality of light transmission layers with different refractive indexes, and regular-arrangement blocky protrusions are distributed on the upper surface and/or the lower surface of the diffusion sheet.
2. The diffusion sheet as claimed in claim 1, wherein when the upper surface or the lower surface of the diffusion sheet is a smooth surface, a diffusion particle layer is distributed on the lower surface or the upper surface.
3. The diffuser as set forth in claim 1, wherein the light-transmitting layers of the diffuser are bonded together by press-fitting.
4. The diffusion sheet as claimed in claim 1, wherein the block-shaped protrusions are quadrangular block-shaped protrusions including any one of square protrusions and rectangular protrusions.
5. The diffusion sheet as claimed in claim 4, wherein when the block-shaped protrusions are the square protrusions, the square protrusions have a height of 0.001MM to 0.003MM, a square width of 0.05MM to 0.15MM, and a distance between adjacent squares is half of the square width.
6. The diffusion sheet as claimed in claim 4, wherein when the block-shaped protrusions are the rectangular block protrusions, the rectangular block protrusions have a height of 0.001MM to 0.003MM, a rectangular block width of 0.05MM to 0.15MM, a rectangular block length twice the rectangular block width, and a distance between adjacent rectangular blocks is half the rectangular block width.
7. The diffuser of any of claims 1-6, further comprising at least one through hole and/or at least one notch cut into a side edge.
8. The diffusion sheet as claimed in claim 7, wherein the through-holes are opened at positions near side edges or corners of the diffusion sheet, the through-holes being circular through-holes or racetrack through-holes;
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 and a brightness enhancement sheet which are arranged in the protective outer frame in sequence from top to bottom, and a light source which is fixed on the inner side wall of the protective outer frame and corresponds to the light guide plate; the surface of the brightness enhancement film is of a smooth structure.
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 |
|---|---|---|---|
| CN202020479921.1U CN212846263U (en) | 2020-04-03 | 2020-04-03 | Diffusion piece, backlight unit and fingerprint identification display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020479921.1U CN212846263U (en) | 2020-04-03 | 2020-04-03 | Diffusion piece, backlight unit and fingerprint identification display screen |
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| Publication Number | Publication Date |
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| CN212846263U true CN212846263U (en) | 2021-03-30 |
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| CN202020479921.1U Expired - Fee Related CN212846263U (en) | 2020-04-03 | 2020-04-03 | Diffusion piece, backlight unit and fingerprint identification display screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252623A1 (en) * | 2021-05-31 | 2022-12-08 | 荣耀终端有限公司 | Electronic device, display assembly, and manufacturing method therefor |
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2020
- 2020-04-03 CN CN202020479921.1U patent/CN212846263U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252623A1 (en) * | 2021-05-31 | 2022-12-08 | 荣耀终端有限公司 | Electronic device, display assembly, and manufacturing method therefor |
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| TR01 | Transfer of patent right |
Effective date of registration: 20210826 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 |