WO2021243569A1 - Module de rétroéclairage, dispositif d'affichage et véhicule - Google Patents

Module de rétroéclairage, dispositif d'affichage et véhicule Download PDF

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Publication number
WO2021243569A1
WO2021243569A1 PCT/CN2020/093954 CN2020093954W WO2021243569A1 WO 2021243569 A1 WO2021243569 A1 WO 2021243569A1 CN 2020093954 W CN2020093954 W CN 2020093954W WO 2021243569 A1 WO2021243569 A1 WO 2021243569A1
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WO
WIPO (PCT)
Prior art keywords
positioning
sub
optical film
edge portion
backlight module
Prior art date
Application number
PCT/CN2020/093954
Other languages
English (en)
Chinese (zh)
Inventor
张宇
李会艳
耿仕新
王伯长
赵立锦
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2020/093954 priority Critical patent/WO2021243569A1/fr
Priority to CN202080000883.XA priority patent/CN114270250B/zh
Priority to US17/036,444 priority patent/US11300819B2/en
Publication of WO2021243569A1 publication Critical patent/WO2021243569A1/fr
Priority to US17/690,260 priority patent/US11573441B2/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices

Definitions

  • At least one embodiment of the present disclosure relates to a backlight module, a display device, and a vehicle.
  • a display device with a curved display area in a display device can be called a curved display device.
  • the curved display device When the curved display device is applied to a large-size display device, it can reduce the visual angle of the user viewing the middle of the display area and the visibility of the edge of the display area. The difference between the angles to achieve a better display effect.
  • At least one embodiment of the present disclosure provides a backlight module, a display device, and a vehicle.
  • At least one embodiment of the present disclosure provides a backlight module, including: a first optical film, including a plurality of first edge portions; a support frame, including a first support portion, the first support portion has a first support
  • the first supporting surface of an optical film supports the first optical film
  • the first supporting portion includes a plurality of frames, and at least one frame is configured to support at least one first edge portion.
  • the at least one frame includes a first positioning groove and at least one second positioning groove
  • the at least one first edge portion includes a first positioning portion and at least one second positioning portion
  • the first positioning portion is located at the first positioning portion. In the positioning groove, and each of the second positioning portions is located in the corresponding second positioning groove.
  • each frame and the corresponding first edge portion In a normal temperature environment, on each frame and the corresponding first edge portion, the sides of each second positioning groove opposite to each other along the extending direction of the frame and the corresponding second positioning portion along the extending direction of the frame are opposite to each other
  • the side edges of the first positioning groove are not in contact with each other, and the difference between the dimensions of the first positioning groove and the first positioning portion along the extension direction of the frame is the first distance, and each of the second positioning grooves and the corresponding second positioning portion
  • the difference in size along the extension direction of the frame is a second pitch, and the first pitch is smaller than the second pitch.
  • the plurality of first edge portions includes a first sub-edge portion extending in a first direction and a second sub-edge portion extending in a second direction, located at the first sub-edge
  • the first positioning portion on the portion is approximately located at the midpoint of the first sub-edge portion in the first direction
  • the at least one second positioning portion includes a plurality of second positioning portions and is located at the first
  • the plurality of second positioning portions on a sub-edge portion are arranged on both sides of the first positioning portion along the first direction.
  • the plurality of second positioning positions located on the first sub-edge portion are directed along the direction from the midpoint of the first sub-edge portion to the end points on both sides.
  • the plurality of second intervals corresponding to the part gradually increase.
  • the plurality of first edge portions include a first sub-edge portion extending in a first direction and a second sub-edge portion extending in a second direction, and the at least one second positioning The part includes a plurality of second positioning parts, and on the first sub-edge part, the plurality of second positioning parts are located on the same side of the first positioning part.
  • the plurality of second positioning portions under the normal temperature environment, from a direction close to the first positioning portion to a direction away from the first positioning portion, the plurality of second positioning portions corresponding to the plurality of second positioning portions The spacing gradually increases.
  • the length of the first sub-edge portion is greater than the length of the second sub-edge portion.
  • the first positioning portion located on the first sub-edge portion includes a first protrusion
  • each second positioning portion located on the first sub-edge portion Comprising a second protruding portion the middle of the second protruding portion includes an opening
  • a boss is provided in the second positioning groove corresponding to the second positioning portion on the first sub-edge portion, the The opening is sleeved on the boss.
  • the sides of each boss facing each other in the first direction and the sides of the corresponding opening facing each other in the first direction are not in contact, and the difference between the size of the opening and the boss in the first direction is a third distance, and the third distance is greater than the first distance.
  • the plurality of third spacings corresponding to the plurality of second positioning portions gradually increase.
  • the second distance between each of the second positioning portions and the corresponding second positioning groove includes at least one of an expansion distance and a contraction distance.
  • the plurality of expansion intervals corresponding to the plurality of second positioning portions gradually increase, and/or, the plurality of second positioning portions correspond to The multiple shrinkage distances gradually increase.
  • the first edge portion further includes a third positioning portion and at least one fourth positioning portion located on the second sub-edge portion, and the first supporting portion is configured to
  • the frame supporting the second sub-edge portion includes a third positioning groove and at least one fourth positioning groove, the third positioning portion is located in the third positioning groove, and each fourth positioning portion is located in a corresponding In the fourth positioning groove, the fourth positioning part is located on the same side of the third positioning part along the second direction.
  • the opposite sides and the sides of the corresponding fourth positioning portion opposite to each other in the second direction are not in contact, and the dimensions of the third positioning groove and the third positioning portion in the second direction are smaller than those of the third positioning portion.
  • the difference is smaller than the size difference between each of the fourth positioning grooves and the corresponding fourth positioning portion along the second direction.
  • the opening of the second positioning part on the first sub-edge part close to the third positioning part is away from the corresponding boss in the second direction.
  • One side of the third positioning portion contacts or maintains a small distance, and the distance between the side of the third positioning portion away from the fourth positioning portion and the corresponding side of the third positioning groove is less than The distance between the side of the third positioning part close to the fourth positioning part and the corresponding side of the third positioning groove, so as to realize the precise positioning of the first optical film in the second direction;
  • the distance between the side of the third positioning part away from the fourth positioning part and the corresponding side of the third positioning groove is smaller than the two sides of each fourth positioning part and the corresponding fourth positioning part. Two pitches of the positioning slot.
  • the frame configured to support the first sub-edge portion of the plurality of frames is an arc-shaped frame, and the curved direction of the arc-shaped frame faces the first optical film .
  • the backlight module further includes: a second optical film including a plurality of second edge portions, and the second optical film is located between the first optical film and the support frame. Between the first supporting surfaces, the first supporting surface is configured to support the second optical film and the first optical film, and at least one of the plurality of frames is configured to support at least A second edge.
  • the at least one frame of the first supporting portion further includes a plurality of retaining walls, at least one second edge portion includes a plurality of recessed portions, and the plurality of recessed portions are arranged in a one-to-one correspondence with the multiple retaining walls, and each of the The recessed portion is configured to be engaged with the corresponding retaining wall to fix the second optical film.
  • the second optical film includes a third sub-edge portion extending in the first direction and a fourth sub-edge portion extending in the second direction;
  • the plurality of The recessed portion includes a first sub-recess located on the third sub-edge portion and a plurality of second sub-recesses, and the first sub-recess is substantially located on the third sub-edge portion in the first direction
  • the plurality of second sub-recessed portions are arranged on both sides of the first sub-recessed portion; in the normal temperature environment, the second sub-recessed portions are opposite to each other along the first direction
  • the sides of the corresponding retaining wall are not in contact with the sides of the corresponding retaining wall in the first direction, and the first sub-recess is less than the size of the corresponding retaining wall in the first direction.
  • the difference is a fourth pitch, and the difference between the dimensions of the second sub-recess and the corresponding retaining wall along the first direction is a fifth pitch, and the fourth
  • the length of the third sub-edge portion is greater than the length of the fourth sub-edge portion.
  • the plurality of fifth sub-recesses corresponding to the plurality of second sub-recesses gradually increases.
  • the plurality of recessed portions include a third sub-recess and at least one fourth sub-recess located on the fourth sub-edge portion, and the at least one fourth sub-recess Located on one side of the third sub-recess in the second direction, under the normal temperature environment, the size of the third sub-recess and the corresponding retaining wall along the second direction The difference is smaller than the difference between the dimensions of each of the fourth sub-recesses and the corresponding retaining wall along the second direction.
  • each of the plurality of retaining walls includes two sub-retaining walls arranged along the extension direction of the frame where the retaining wall is located, and the two sub-retaining walls are arranged between the two sub-retaining walls.
  • the edges other than the first positioning portion, the second positioning portion, the third positioning portion, and the fourth positioning portion are separated from the retaining wall.
  • a convex structure is provided between two adjacent concave portions of the plurality of concave portions, and the convex structure is located in the interval between two adjacent retaining walls.
  • the backlight module further includes a back plate, at least part of the back plate is located on a side of the support frame away from the first optical film.
  • the back plate includes a bottom plate and a side plate arranged on an edge of the bottom plate, the support frame is connected to the bottom plate, and the bottom plate includes a bottom wall and a second support portion located outside the edge of the bottom wall.
  • the second supporting portion has a second supporting surface facing the first optical film, and the first supporting portion is disposed on the second supporting surface of the second supporting portion.
  • the side plate is located outside the first supporting portion and surrounds the first supporting portion, and the side plate includes at least one first avoiding groove, and each of the first The avoidance groove is opposite to the second positioning groove, the third positioning groove or the fourth positioning groove, so that the second positioning portion extends to the first positioning groove after passing through the corresponding second positioning groove.
  • the avoidance groove the third positioning portion extends into the first avoidance groove after passing through the third positioning groove, or the fourth positioning portion extends to the first avoidance groove after passing through the corresponding fourth positioning groove In the first avoidance slot.
  • the side plate further includes at least one second avoidance groove, and the second avoidance groove is opposite to the interval between two adjacent retaining walls, and the protrusion The structure extends into the second avoidance groove after passing through the corresponding interval.
  • the portion of the side plate extending along the second direction includes two first avoiding grooves and one second avoiding groove, and the second avoiding groove is located in the Between the two first avoidance slots.
  • a glue is provided between the second optical film and the first supporting surface to bond the second optical film to the supporting frame.
  • At least one embodiment of the present disclosure provides a display device including the above-mentioned backlight module.
  • the display device is a vehicle-mounted display device.
  • the display device is a curved display device.
  • At least one embodiment of the present disclosure provides a vehicle including the above-mentioned display device.
  • FIG. 1 is a schematic diagram of a partial cross-sectional structure of a backlight module provided according to an embodiment of the present disclosure
  • FIG. 2A is a schematic plan view of a first middle frame in the backlight module shown in FIG. 1;
  • Fig. 2B is a side view of the first middle frame shown in Fig. 2A;
  • 3A is a schematic plan view of a first optical film in the backlight module shown in FIG. 1;
  • 3B is a schematic plan view of another first optical film in the backlight module shown in FIG. 1;
  • FIG. 4 is a schematic plan view of the first optical film and the first middle frame of the backlight module shown in FIG. 1;
  • FIG. 5 is a partial enlarged view of the E1 area of the backlight module shown in FIG. 4;
  • FIG. 6 is a partial enlarged view of the E2 area of the backlight module shown in FIG. 4;
  • FIG. 7 is a partial enlarged view of the E5 area of the backlight module shown in FIG. 4;
  • FIG. 8 is a partial enlarged view of the E6 area of the backlight module shown in FIG. 4;
  • FIG. 9 is a partial enlarged view of the E7 area of the backlight module shown in FIG. 4;
  • FIG. 10 is a partial enlarged view of the E8 area of the backlight module shown in FIG. 4;
  • FIG. 11 is a schematic plan view of a second optical film according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic plan view of a second optical film and a first middle frame according to an embodiment of the present disclosure
  • FIG. 13 is a partial enlarged view of the E9 area in the backlight module shown in FIG. 12;
  • FIG. 14 is a partial enlarged view of the E10 area in the backlight module shown in FIG. 12;
  • FIG. 15 is a partial enlarged view of the E11 area of the backlight module shown in FIG. 12;
  • FIG. 16 is a partial enlarged view of the E12 area of the backlight module shown in FIG. 12;
  • FIG. 17 is a partial cross-sectional view of a backlight module including a backplane according to an embodiment of the present disclosure
  • FIG. 18 is a schematic diagram of the planar structure of the reflective sheet shown in FIG. 17;
  • Figures 19-20 are two side views of the backplane shown in Figure 17;
  • 21 is a schematic diagram of the positional relationship between the first optical film, the first middle frame, and the back plate in the backlight module shown in FIG. 17;
  • FIG. 22 is a schematic diagram of the positional relationship between the second optical film and the first middle frame and the back plate in the backlight module shown in FIG. 17;
  • FIG. 23 is an exploded schematic diagram of a display device provided according to an embodiment of the present disclosure.
  • a vehicle-mounted liquid crystal display module includes a side-light type backlight.
  • the backlight includes a structural member and an optical film fixed on the structural member.
  • the opposite sides of the structural member are provided with grooves, and the grooves include positioning
  • the edge of the optical film is provided with a protrusion, the protrusion includes a circular hole matching the positioning column, and the surface of the optical film facing the structural member is provided with double-sided adhesive to bond the optical film and the structural member, Therefore, when the vehicle-mounted liquid crystal display module is applied to the vehicle-mounted vibration condition, it can play a role in stabilizing the optical film.
  • the inventor of the present application found that the fixing method of the optical film and the structural member in the above-mentioned vehicle-mounted liquid crystal display module is similar to that of the optical film in the general small-size liquid crystal display module.
  • the difference is that the optical film
  • the sheet is also bonded to the structural member by double-sided tape, thereby reducing the relative displacement between the optical film and the structural member.
  • This limit method with double-sided tape restricts the space of the optical film.
  • the environment of the vehicle-mounted LCD module includes not only the vibration environment, but also the environment of high temperature and high humidity.
  • the vehicle-mounted LCD module may It will be in a high temperature and high humidity environment with a temperature range of -40 to 95°C and a relative humidity of up to 90%.
  • the optical film When the optical film is subjected to the thermal shock reliability test, the optical film will expand or contract, and the above-mentioned double-sided tape arranged between the optical film and the structural member limits the expansion or contraction of the optical film
  • the movable space may cause wrinkles, warping and other defects of the optical film, which in turn affects the display screen of the display device.
  • Embodiments of the present disclosure provide a backlight module, a display device, and a vehicle.
  • the backlight module provided by the embodiment of the present disclosure includes a first optical film and a supporting frame.
  • the first optical film includes a plurality of first edge portions;
  • the support frame includes a first support portion, the first support portion has a first support surface facing the first optical film to support the first optical film, the first support portion includes A plurality of frames, at least one frame is configured to support at least one first edge portion.
  • At least one frame of the first supporting portion includes a first positioning groove and at least one second positioning groove
  • at least one first edge portion of the first optical film includes a first positioning portion and at least one second positioning portion
  • the first positioning portion It is located in the first positioning groove
  • each second positioning portion is located in the corresponding second positioning groove.
  • the sides of each second positioning groove opposite to each other along the extending direction of the frame and the corresponding second positioning portion along the extending direction of the frame are opposite to each other
  • the side edges of the first positioning groove and the first positioning part are not in contact with each other, and the difference in the size of the first positioning part along the extension direction of the frame is the first pitch.
  • Each second positioning groove and the corresponding second positioning part extend along the frame
  • the size difference in the direction is the second pitch
  • the first pitch is smaller than the second pitch.
  • the distance between the two positioning parts of the optical film and the corresponding positioning groove is set to achieve the combination of fine positioning and coarse positioning, which can ensure the fixation of the optical film and the support frame, and also Ensure that the optical film is not prone to wrinkles in a high temperature and high humidity environment, and does not affect the normal display.
  • FIG. 1 is a schematic partial cross-sectional structure diagram of a backlight module according to an embodiment of the present disclosure
  • FIG. 2A is a schematic plan view of a first middle frame in the backlight module shown in FIG. 1
  • FIG. 2B is a schematic diagram of the first middle frame shown in FIG. 2A
  • 3A is a schematic plan view of the structure of the first optical film in the backlight module shown in FIG. 1
  • FIG. 4 is a schematic view of the plan structure of the first optical film and the first middle frame in the backlight module shown in FIG.
  • 5 is a partially enlarged view of the E1 area of the backlight module shown in FIG. 4
  • FIG. 6 is a partially enlarged view of the E2 area of the backlight module shown in FIG.
  • the backlight module includes a first optical film 100 and a first middle frame 200.
  • the first middle frame 200 here is a support frame that plays a supporting role, and may also be referred to as a support frame.
  • the first middle frame 200 includes a first supporting portion 201 having a first supporting surface 2010 facing the first optical film 100 to support the first optical film 100.
  • the first supporting portion 201 includes a plurality of frames 202, and the first optical film 100 includes a plurality of first edge portions.
  • At least one frame 202 of the first supporting portion 201 includes a first positioning groove 210 and at least one second positioning groove 220, and at least one first edge portion of the first optical film 100 includes a first positioning portion 110 and at least one second positioning portion.
  • the first positioning portion 110 is located in the first positioning groove 210
  • each second positioning portion 120 is located in the corresponding second positioning groove 220 to fix the first optical film 100 on the first supporting portion 201.
  • each frame 202 of the first support portion 201 includes a first positioning groove 210 and at least one second positioning groove 220
  • each first edge portion of the first optical film 100 includes a first positioning portion 110 and at least one second positioning groove.
  • Two positioning unit 120 is provided.
  • the first middle frame may be a structural component that carries the display module, and is used to accommodate and carry components such as optical films, light bars (light panels), and reflective sheets.
  • the first middle frame may also be one of the structural components that only carry the optical film.
  • the first middle frame may be made of metal material or plastic material.
  • the two side edges of the corresponding second positioning part that are close to the two inner sides of each second positioning groove are along the edge of the frame.
  • the side edges of the first positioning groove opposite to each other along the extending direction of the frame and the side edges of the first positioning portion opposite to each other along the extending direction of the frame may or may not have an interval between them.
  • the normal temperature environment in the embodiments of the present disclosure refers to the ambient temperature in which the backlight module is located is 0-40°C, such as 10-30°C, such as 25°C.
  • the multiple frames 202 included in the first support portion 201 are connected end to end to form a closed polygon.
  • the embodiment of the present disclosure is described by taking the multiple frames 202 including four frames, and the multiple frames 202 enclosing a rectangle as an example, but it is not limited thereto.
  • the number of multiple frames may also be 3 or more, which is not limited in the embodiment of the present disclosure.
  • the embodiment of the present disclosure is described by taking the backlight module as a curved backlight module as an example. Then, at least one frame of the first support portion is an arc frame, and one of the arc frames is positioned at The projection on the XZ plane is a straight line and extends along the X direction as an example.
  • the first positioning groove 210 located on the frame includes two inner sides opposite to each other in the X direction, the first positioning portion 110 is located in the two inner sides, and the two sides of the first positioning portion 110 are There is an interval A1 and an interval A2 between the inner sides, respectively.
  • the second positioning groove 220 located on the frame also includes two inner sides opposite to each other in the X direction, the second positioning portion 120 is located in the two inner sides, and the two sides of the second positioning portion 120 are connected to the two inner sides. There is an interval B1 and an interval B2 between the inner sides. In a normal temperature environment, there are two intervals in the X direction between each positioning part and the corresponding positioning groove. One of the two intervals provides expansion space for the first optical film, and the other is the first optical film. The film provides shrinking space.
  • the positioning portion of the first optical film and the first middle frame Sufficient expansion space or contraction space is provided between the corresponding positioning grooves, so as to prevent the first optical film from being obstructed by the first middle frame during the expansion or contraction process to cause wrinkles.
  • the size of the two spaces reserved between each positioning part and the corresponding positioning groove can be the same or different.
  • the size relationship between the two spaces can be based on the high temperature or low temperature environment.
  • the size of the expansion and contraction of an optical film is determined.
  • the temperature range of the vehicle-mounted environment may be -40 to 95°C. Taking a normal temperature environment of 25°C as an example, the low-temperature temperature difference is 65°C, the high temperature difference is 70°C.
  • the width of the interval that provides expansion space for the first optical film among the two intervals between each positioning groove and the corresponding positioning portion is larger than the width of the interval that provides contraction space for the first optical film.
  • the width of the interval that provides expansion space for the first optical film in the two intervals between each positioning groove and the corresponding positioning portion is 0.1 to 0.4 larger than the width of the interval that provides contraction space for the first optical film.
  • the width of the interval providing expansion space for the first optical film among the two intervals between the positioning grooves and the corresponding positioning portion may be equal to the width of the interval providing contraction space for the first optical film. .
  • the width of the two spaces between the positioning grooves and the corresponding positioning portions will change to a certain extent.
  • the interval for providing expansion space for the first optical film may change to 0 when the backlight module is in a high-temperature environment, or the interval for providing a contraction space for the first optical film may change to zero when the backlight module is in a low-temperature environment. Change to 0 from the bottom. Therefore, the width of the two spaces between each positioning groove and the corresponding positioning portion is based on the backlight module being in a normal temperature environment.
  • the first positioning groove 210 and the second positioning groove 220 are located on the same frame, and the first positioning portion 110 is The sum of the dimensions of the two spaces between the adjacent sides of the positioning groove 210 along the extension direction of the frame is the first distance S1, and the distance between the second positioning portion 120 and the adjacent sides of the second positioning groove 220 The sum of the dimensions of the two spaces along the extending direction of the frame is the second space S2.
  • the size difference between the first positioning groove 210 and the first positioning portion 110 along the extension direction of the frame is the first distance S1
  • the distance between each second positioning groove 220 and the corresponding second positioning portion 120 along the frame is The difference in the size in the extension direction is the second pitch S2.
  • the first distance S1 is smaller than the second distance S2.
  • the first positioning portion 110 is a fine positioning portion
  • the first positioning groove 210 is a fine positioning groove.
  • the cooperation of the fine positioning portion and the fine positioning groove realizes the fine positioning of the first optical film;
  • the second positioning portion 120 is thick.
  • the positioning part, the second positioning groove 220 is a rough positioning groove, and the cooperation of the rough positioning part and the rough positioning groove realizes the rough positioning of the first optical film.
  • the fine positioning in the embodiments of the present disclosure refers to only considering the manufacturing tolerances of the fine positioning part and the fine positioning groove, and the manufacturing tolerance is a reasonable tolerance that exists in order to facilitate the installation of the fine positioning part into the fine positioning groove.
  • the cutting tolerance range of the fine positioning part is 0.05 to 0.1 mm
  • the manufacturing tolerance range of the fine positioning groove is 0.05 to 0.15 mm.
  • the width of the interval A1 and the interval A2 between the fine positioning portion and the fine positioning groove may both be 0.18 mm
  • the first spacing S1 may be 0.36 mm.
  • the width of the interval A1 and the interval A2 may be the width when the backlight module is in a normal temperature environment. When the backlight module is in a vehicle-mounted environment and the backlight module is no longer in a normal temperature environment, the width of the interval A1 and the interval A2 may be Will change, but the first distance S1 remains basically unchanged.
  • the fine positioning in the embodiments of the present disclosure means that the manufacturing tolerances and assembly tolerances of the fine positioning part and the fine positioning groove should be considered without considering the deformation dimensions affected by temperature and humidity. Therefore, the fine positioning part and the fine positioning groove can be installed and fixed.
  • the relative displacement of the optical film and the first middle frame is restricted in at least one direction, so that the backlight module of the display device can meet the vibration reliability under certain usage scenarios, such as a vehicle-mounted display device. It should be noted that those skilled in the art can know that the existence of precise positioning does not make the diaphragm achieve a completely ideal meaning without relative displacement.
  • the coarse positioning in the embodiments of the present disclosure means that the manufacturing process difference between the coarse positioning part and the coarse positioning groove, the assembly tolerance, and the deformation size of the material affected by temperature and humidity should be considered. Therefore, the coarse positioning part and the coarse positioning groove are fixed after being fixed. A certain relative displacement can occur in at least one direction.
  • the size difference between the coarse positioning part and the coarse positioning groove is set to be greater than that between the fine positioning part and the fine positioning groove
  • the width of the interval B1 and the interval B2 between the coarse positioning portion and the coarse positioning groove may both be 2 mm
  • the second spacing S2 may be 4 mm.
  • the combination of fine positioning and rough positioning is adopted between the first optical film and the first middle frame in the embodiments of the present disclosure, which can not only ensure the fixation of the first optical film and the first middle frame, but also ensure that the first optical film The film is not prone to wrinkles in a high temperature and high humidity environment, and does not affect the normal display.
  • the first supporting surface of the first supporting portion means that the side of the first supporting portion facing the first optical film is provided with a surface supporting the first optical film, and the first supporting surface is defined as The surface of is to better illustrate the positional relationship between other components and the first supporting surface, but it does not mean that the first supporting surface of the first supporting portion must be a flat surface, and may also be a curved surface.
  • the first supporting surface as a flat surface or a curved surface may be a flat surface or a curved surface located at the bottom of the convex structures.
  • the various positional relationships modified with “upper” and “lower”, or “top” and “bottom” have clear meanings.
  • the direction from the center of the first optical film to the edge is called the “outward” direction, and the direction from the edge of the first optical film to the center is called In the "inward” direction. Therefore, the relative positional relationship modified by "inner” and “outer” also has a clear meaning.
  • orientation is only exemplary and indicate the phase position relationship of each component.
  • the entire device or equipment can be rotated to a certain extent as a whole. angle.
  • the first optical film 100 includes a plurality of contour edges corresponding to the plurality of frames 202 of the first support portion 201 one-to-one, that is, a plurality of first edge portions, and the first support portion
  • the multiple frames included in 201 respectively support multiple first edge portions.
  • the embodiment of the present disclosure is described by taking the first optical film 100 including four contour edges, and the four contour edges enclosing the first optical film as a substantially rectangular first optical film as an example, but is not limited thereto.
  • the number of contour edges can also be 3 or more, as long as the multiple borders of the first middle frame correspond to the multiple contour edges of the first optical film one-to-one, which is not limited in the embodiment of the present disclosure.
  • the multiple contour edges of the first optical film 100 include a first sub-edge portion 101 extending in a first direction and a second sub-edge portion 102 extending in a second direction.
  • the length of one sub-edge portion 101 is greater than the length of the second sub-edge portion 102.
  • the first sub-edge portion is a long side
  • the second sub-edge portion is a short side.
  • the frame supporting the first sub-edge portion is a curved frame, such as an arc-shaped frame, as an example, the first supporting surface forms a curved surface, and the backlight module is a curved backlight module.
  • the frame supporting the second sub-edge portion may be an arc frame or a straight frame.
  • the frame supporting the first sub-edge portion may also be a frame extending in a linear direction, and the first supporting surface of the first supporting portion is a plane, and the backlight module is a non-curved backlight module.
  • the contour edge of the first optical film in the embodiments of the present disclosure may be a straight edge, or a curved edge or a folded edge.
  • one contour edge has a general extending direction, such as a first direction or a second direction.
  • at least one of the first sub-edge portion extending in the first direction and the second sub-edge portion extending in the second direction is an arc-shaped edge.
  • the first The sub-edge portion is an arc-shaped side
  • the second sub-edge portion is a straight side.
  • the extension direction of the first sub-edge portion is also an arc-shaped extension direction.
  • the above-mentioned first distance may refer to the sum of the dimensions of the two spaces between the two sides of the first positioning portion and the first positioning groove along the extending direction of the arc.
  • the curvature of the arc-shaped side is small, the two The size of the interval along the arc extending direction is slightly different from the size along the X direction.
  • the four sides of the film layer are not the standard four straight lines.
  • the four sides of the film layer are four polyline-shaped contour sides, and the quadrilateral formed by the four contour sides is not a rectangle in the strict sense. It is a roughly rectangular shape with four polyline sides.
  • At least one second positioning portion 120 includes a plurality of second positioning portions 120, and the first positioning portion 110 and the plurality of second positioning portions 120 are both located at the first sub-edge portion 101.
  • the first positioning portion and the second positioning portion respectively realize the precise positioning and rough positioning of the first sub-edge portion and the corresponding frame.
  • the first positioning portion 110 located on the first sub-edge portion 101 is approximately located at the midpoint of the first sub-edge portion 101, and a plurality of second positioning portions located on the first sub-edge portion 101
  • the positioning portions 120 are distributed on both sides of the first positioning portion 110.
  • the number of the first positioning portion located on the first sub-edge portion is taken as an example, but it is not limited to this.
  • the plurality of second positioning portions located on the long side of the first optical film are multiple coarse positioning portions, and the fine positioning portion is roughly arranged at the midpoint of the long side of the first optical film.
  • multiple coarse positioning parts are placed on both sides of the fine positioning part, so that the first optical film can be centered on the fine positioning part and to the left and right (taking the X direction as an example to the right) in a high temperature environment. Expand; or make the first optical film in a low temperature environment, the parts located on both sides of the fine positioning part shrink to the middle. As a result, the dimensional change of the long side of the first optical film during expansion or contraction can be minimized.
  • the number of second positioning portions 120 located on both sides of the first positioning portion 110 is equal, and the number of second positioning portions 120 located on both sides of the first positioning portion 110 is equal 120 is symmetrically distributed with the first positioning portion 110 as the center. That is, the number of coarse positioning parts located on both sides of the fine positioning part is equal, and the plurality of coarse positioning parts are symmetrically distributed with the fine positioning part as the center. Therefore, it can be ensured that the long sides of the first optical film expand or contract substantially symmetrically in a high temperature or low temperature environment, so as to facilitate the setting of the relative positional relationship between the first optical film and the first middle frame.
  • the first optical film is placed vertically as an example for description, and the ground is taken as a reference, and the direction indicated by the arrow in the Z direction is upward.
  • the first sub-edge portion is horizontally arranged, and the second sub-edge portion is vertically arranged.
  • FIG. 3B is a schematic plan view of the first optical film provided by another example of the embodiment of the present disclosure.
  • the difference from the optical film shown in FIG. 3A is that on the first sub-edge portion 101, a plurality of second positioning portions 120 are located on the same side of the first positioning portion 110.
  • the first optical film is placed vertically as an example for description, and the ground is used as a reference, and the direction indicated by the arrow in the X direction is upward.
  • the first sub-edge portion is vertically arranged, and the second sub-edge portion is horizontally arranged.
  • the distribution position relationship of the parts is different, and other features of the first optical film shown in FIG. 3A described later are also included in the first optical film shown in FIG. 3B.
  • the first positioning portion 110 is disposed within 1/3 of an end close to the first sub-edge portion 101 (for example, the upper end, based on the ground, and the direction indicated by the arrow in the X direction is upward).
  • the at least one second positioning portion 120 includes a plurality of second positioning portions 120 disposed between the first positioning portion 110 and the other end (lower end).
  • the plurality of second spacings corresponding to the plurality of second positioning portions 120 gradually increase. Therefore, in the embodiment of the present disclosure, from the direction close to the first positioning portion to the direction away from the first positioning portion, the multiple second spacings corresponding to the second positioning portion located on the first sub-edge portion gradually increase, which may be Different and sufficient intervals are reserved between the positioning parts and the positioning grooves at various positions, so as to ensure that the first optical film at each position does not appear to be wrinkled when it expands or contracts due to temperature changes in the vehicle-mounted environment. , And can prevent wasting space by finely designing the gap size, and prevent the fixation of the first optical film and the first middle frame from being affected.
  • At least one second positioning groove 220 includes a plurality of second positioning grooves 220, a plurality of second positioning grooves 220 and a plurality of second positioning portions located on the first sub-edge portion 101 120 are arranged in one-to-one correspondence, and each second positioning portion 120 is located in each second positioning groove 220.
  • the sum of the space B1 and the space B2 between each second positioning portion 120 and the corresponding second positioning groove 220 in the first direction is the second spacing S2, which is along the center of the first sub-edge portion 101
  • the points point to the direction of the end points on both sides, and the multiple second spacings S2 corresponding to the second positioning portion 120 located on the first sub-edge portion 101 gradually increase.
  • the above-mentioned second distance may refer to the sum of the dimensions of the two spaces between the two sides of the second positioning portion and the corresponding second positioning groove along the extending direction of the arc-shaped side.
  • one of the interval B1 and the interval B2 between each second positioning portion 120 and the corresponding second positioning groove 220 is an interval for providing an expansion space for the first optical film 100 (that is, an expansion interval is provided), and the other It is an interval for providing a shrinking space for the first optical film 100 (ie, providing a shrinking pitch).
  • the present disclosure schematically shows that the second spacing between each second positioning portion and the corresponding second positioning groove includes an expansion spacing and a contraction spacing, but it is not limited to this, and each second positioning portion is different from the corresponding second positioning groove.
  • the second distance between the two also includes one of the expansion distance and the contraction distance, that is, only the expansion distance or only the contraction distance.
  • the interval B1 as the interval for providing the expansion space for the first optical film 100 and the interval B2 as the interval for providing the contraction space for the first optical film 100 as an example. That is, the dimension of the interval B1 along the first direction is the expansion interval, and the dimension of the interval B2 along the first direction is the contraction interval.
  • the temperature range of the vehicle-mounted environment in which the backlight module is applied is -40°C to 95°C, and the temperature of the normal temperature environment is 25°C.
  • the vehicle-mounted environment in which the backlight module is located is reduced from room temperature to the lowest temperature.
  • the temperature difference is 65°C, and the temperature difference from room temperature to the highest temperature is 70°C.
  • ⁇ T1 represents the high-temperature temperature difference of the vehicle-mounted environment where the first optical film 100 is located
  • L represents the distance between the midpoint of the second positioning portion 120 and the midpoint of the first positioning portion 110
  • the thermal expansion coefficient CET1 of the first optical film 100 along the first direction is related to the temperature range where the first optical film 100 is located.
  • the thermal expansion coefficient CET1 of the first optical film 100 is at 75°C to 95°C.
  • the value is greater than the value of the thermal expansion coefficient CET1 when the first optical film 100 is at 50°C to 75°C, and the value of the thermal expansion coefficient CET1 when the first optical film 100 is at 50°C to 75°C is greater than the value of the first optical film 100 at The value of the thermal expansion coefficient CET1 at 25°C to 50°C.
  • the thermal expansion coefficient on the first sub-edge portion (long side) of the first optical film in the embodiment of the present disclosure is smaller than the thermal expansion coefficient on the second sub-edge portion (short side), so that the first optical film can be reduced
  • the expansion of the sheet on the first sub-edge requires a gap.
  • polarized brightness enhancement films can be used; for backlight modules with conventional brightness requirements, ordinary brightness enhancement films and diffusion films can be used.
  • the first optical film 100 may include at least one of a first diffusion sheet, a prism layer, and a second diffusion sheet.
  • the material of the first diffusion sheet may include polyethylene terephthalate (PET) or Materials such as polycarbonate.
  • the thermal expansion coefficient of ordinary brightness enhancement film and diffusion film in the short side direction can be 3.5*10 -5 cm/(cm*°C), and the thermal expansion coefficient in the long side direction can be 3.0*10 -5 cm/ (cm*°C), the shrinkage in the short-side direction is approximately 0.5%, and the shrinkage in the long-side direction is approximately 0.2%.
  • the above-mentioned single-layer films such as ordinary brightness enhancement film and diffusion film have different expansion coefficients in two different stretching directions (for example, TD direction or MD direction). If the expansion coefficient in the MD direction is small, and the shrinkage coefficient is small, the expansion and contraction in the TD direction are The amount is greater than the expansion and contraction amount in the MD direction.
  • the long side is designed in the MD direction to minimize the expansion and contraction space of the long side.
  • the expansion coefficient of the above-mentioned ordinary brightness enhancement film and diffusion film and other single-layer films is determined by the material (such as polymethyl methacrylate PMMA or polycarbonate PC) and the direction in which the material is stretched (such as the TD direction or the MD direction) and The temperature range is determined.
  • ⁇ T2 in the above relational expression represents the low-temperature temperature difference of the vehicle-mounted environment in which the first optical film 100 is located.
  • interval B1 is not only related to the expansion required gap gap1 (contraction required gap gap2), but also related to the cutting tolerance (DBEF) of the first optical film 100 and the injection tolerance (DMF) of the first middle frame 200
  • the cutting tolerance of the first optical film 100 depends on the position of the interval B1 (interval B2) and the size corresponding to the tolerance zone
  • the injection tolerance of the first middle frame 200 depends on the position of the interval B1 (interval B2).
  • the size corresponds to the tolerance zone.
  • Tolerance zone refers to an area defined by two straight lines representing the upper deviation and the lower deviation or the maximum limit size and the minimum limit size in the tolerance zone diagram. It can also be called a dimensional tolerance zone.
  • the width of the interval for providing the contraction space for the first optical film is equal to the width of the interval for providing the expansion space for the first optical film (for short expansion interval) as an example, at the position of the first positioning portion 110 .
  • the cutting tolerance of the first optical film 100 is approximately 0.05mm
  • the injection tolerance of the first middle frame 200 is approximately 0.05mm
  • the expansion required gap gap1 is approximately 0.07mm
  • the interval A1 and the interval A2 should not be less than 0.17mm
  • the interval A1 and the interval A2 may both be 0.18 mm
  • the first interval may be 0.36 mm.
  • the distance between the center of the second positioning portion 120 and the center of the first positioning portion 110 in the E2 area is L1, and L1 is approximately 172 mm.
  • the cutting tolerance of the first optical film 100 is approximately 0.1 mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15 mm
  • the expansion required gap gap1 is approximately 0.98 mm
  • the interval B1 and the interval B2 should not be less than 1.23mm, for example, the interval B1 and the interval B2 can be 2mm
  • the second interval can be 4mm.
  • the distance between the center of the second positioning portion 120 and the center of the first positioning portion 110 in the E3 area is L2, and L2 is approximately 343 mm.
  • the cutting tolerance of the first optical film 100 is approximately 0.15mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15mm
  • the expansion required gap gap1 is approximately 1.95mm
  • the second positioning portion 120 at the E3 area corresponding to the interval for providing expansion space should not be less than 2.25mm.
  • the expansion interval at the E3 area can be 2.5mm
  • the contraction interval at the E3 area is also 2.5mm.
  • the second distance can be 5mm.
  • the distance between the center of the second positioning portion 120 and the center of the first positioning portion 110 in the E4 area is L3, and L3 is approximately 540 mm.
  • the cutting tolerance of the first optical film 100 is approximately 0.15mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15mm
  • the expansion required gap gap1 is approximately 3.06mm
  • the interval for providing expansion space corresponding to the second positioning portion 120 in the E3 area should not be less than 3.36 mm, for example, 3.4 mm, and the second interval may be 6.8 mm.
  • the required spacing for providing expansion and contraction space corresponding to the second positioning portion gradually increases. That is, the second distance between each second positioning portion and the corresponding second positioning groove includes an expansion distance and a contraction distance.
  • the direction along the midpoint of the first sub-edge portion toward the end points on both sides is more.
  • the multiple expansion intervals corresponding to the second positioning portions gradually increase, and the multiple contraction intervals corresponding to the multiple second positioning portions gradually increase. Therefore, in the embodiment of the present disclosure, along the direction that the midpoint of the first sub-edge portion points to the end points on both sides, the plurality of second spacings corresponding to the second positioning portions on the first sub-edge portion gradually increase, so that Reserve a different and sufficient interval between the positioning part and the positioning groove at each position, so as to ensure that the first optical film at each position does not expand or contract due to temperature changes in the vehicle environment. Wrinkles can prevent wasted space through the refined design of the gap size, and prevent the fixation of the first optical film and the first middle frame from being affected.
  • the backlight module is a curved backlight module
  • the first supporting portion 201 of the first middle frame 200 is used to support the first sub-edge portion (long The frame of the side) is a curved frame, for example, an arc frame so that the first optical film 100 is formed into a curved structure.
  • the extending direction of the first sub-edge portion is the curved extending direction, which is a direction different from the X direction shown in the figure. It is used in the curved backlight module of the vehicle environment where the temperature range is -40 ⁇ 100°C, the humidity is as high as 90%, and the single use time is more than 1000 hours. Different positions of the first optical film will produce different expansion and contraction.
  • the general first optical film and the first middle frame are simply fixed by a rough positioning method and the gap between the first optical film and the first middle frame at the rough positioning position is fixed.
  • the structure cannot guarantee the first optical film
  • the uniformity of the overall curvature when in a bent state causes the first optical film to easily produce wrinkles such as local bulging.
  • the first optical film and the first middle frame adopt a combination of fine positioning and coarse positioning to cooperate with multiple positioning parts and corresponding positioning grooves.
  • the interval of the first optical film can not only ensure that the first optical film is in a good fixed state under long-term severe vibration conditions, but also can meet the needs of the first optical film at different positions in the vehicle-mounted environment with high temperature and high humidity for a long time. The need for space for expansion and contraction.
  • the first positioning portion 110 located on the first sub-edge portion 101 includes a first protrusion 111, and among the plurality of second positioning portions 120 located on the first sub-edge portion 101 Each includes a second protrusion 121.
  • the contour edge (first sub-edge portion) where the first protrusion 111 and the second protrusion 121 are located includes a protrusion and a straight line segment between adjacent protrusions, that is, the connecting portion 130.
  • the plurality of protrusions and the plurality of connecting portions are connected end to end to form a contour edge in the shape of a broken line.
  • the middle portion of the second protrusion 121 includes an opening 12, and the first protrusion 111 does not include an opening.
  • Each of the plurality of second positioning grooves 220 includes a boss 221, and the opening 12 of the second protrusion 121 is configured to be sleeved on the boss 221 to realize the fixation of the first optical film 100 and the first middle frame 200.
  • the embodiment of the present disclosure uses a protrusion (such as a convex) without openings.
  • the ear is used as the fine positioning part
  • the protruding part with the opening (for example, the hanging ear) is provided as the coarse positioning part, which can realize the combination of the fine positioning and the coarse positioning of the first optical film, and fix the first optical film more stably On the first middle frame.
  • the protruding portion as the fine positioning portion may be a solid structure without openings, so that the structural strength of the fine positioning portion can be increased.
  • each boss 221 along the first direction is smaller than the size of the corresponding opening 12 along the first direction, so that the two sides of each boss and the corresponding opening There is an interval between the two inner sides along the first direction. That is, the sides of the bosses facing each other in the first direction and the sides of the corresponding opening facing each other in the first direction are not in contact.
  • the size of the interval C1 may refer to the size of the interval C1 (or the interval C2) along the extending direction of the arc-shaped side.
  • one of the two spaces provided in the first direction between each boss and the corresponding opening provides an expansion space for the first optical film, and the other provides a contraction space for the first optical film.
  • the dimension of the interval C1 in the first direction may be a contraction interval
  • the dimension of the interval C2 in the first direction may be an expansion interval.
  • the opening of the first optical film and the convexity of the first middle frame Sufficient expansion space or contraction space is provided between the stages, so as to prevent the first optical film from being obstructed by the first middle frame during the expansion or contraction process to cause wrinkles.
  • the size of the two spaces reserved between each boss and the two inner sides of the corresponding opening can be the same or different.
  • the size relationship between the two spaces can be based on high temperature or low temperature.
  • the size of the expansion and contraction of the first optical film under the environment is determined.
  • the width of the interval that provides expansion space for the first optical film among the two intervals between each opening and the corresponding boss may be equal to the width of the interval that provides contraction space for the first optical film. .
  • the width of the two intervals between each opening and the corresponding boss will change to a certain extent, for example, to provide expansion space for the first optical film
  • the interval of may change to 0 when the backlight module is in a high temperature environment, or the interval of providing a shrink space for the first optical film may change to 0 when the backlight module is in a low temperature environment. Therefore, the width of the two spaces between each opening and the corresponding boss is based on the fact that the backlight module is in a normal temperature environment.
  • the sum of the size of the interval C1 and the interval C2 between the opening 12 and the side edges of the boss 221 that are close to each other in the first direction is the third interval S3, that is, the opening and
  • the difference in size along the first direction is a third distance
  • the third distance S3 is greater than the first distance S1.
  • the plurality of third spacings corresponding to the plurality of second positioning portions gradually increase.
  • an example of the embodiment of the present disclosure is described by taking the interval C2 as the interval for providing the expansion space for the first optical film 100, and the interval C1 as the interval for providing the contraction space for the first optical film 100 as an example.
  • the value of the interval C2 can be the same as the value of the interval B1, that is, the calculation relational expression of the value of the interval C2 is the same as that of the interval B1;
  • the value of the interval C1 can be the same as the value of the interval B2, that is, the interval C1
  • the calculation relational expression for the value of is the same as the calculation relational expression for the interval B2.
  • the third distance S3 may be equal to the second distance S2 to facilitate the design of the first optical film.
  • the vehicle-mounted environment where the backlight module is located is reduced from room temperature to The temperature difference from the lowest temperature is 65°C, and the temperature difference from room temperature to the highest temperature is 70°C.
  • the interval for providing the contraction space for the first optical film is equal to the interval for providing the expansion space for the first optical film.
  • the interval C1 and the interval C2 should not be less than 1.23mm, for example, the interval C1 and the interval C2 may be 2mm, and the third interval S3 may be 4mm.
  • the interval corresponding to the second positioning portion 120 for providing expansion space should not be less than 2.25 mm, such as 2.5 mm, and the third distance may be 5 mm.
  • the interval corresponding to the second positioning portion 120 for providing expansion space should not be less than 3.36 mm, such as 3.4 mm, and the third distance may be 6.8 mm.
  • the plurality of third pitches corresponding to the second positioning portion on the first sub-edge portion gradually increase, so that Reserve a different and sufficient interval between the boss and the opening at each position, so as to ensure that the first optical film at each position does not fold when it expands or contracts due to temperature changes in the vehicle environment. , And can prevent wasting space by finely designing the gap size, and prevent the fixation of the first optical film and the first middle frame from being affected.
  • FIG. 7 is a partial enlarged view of the E5 area of the backlight module shown in FIG. 4, and FIG. 8 is a partial enlarged view of the E6 area of the backlight module shown in FIG.
  • the first edge portion includes a third positioning portion 1100 located at the second sub-edge portion 102 and at least one fourth positioning portion 1200, and the fourth positioning portion 1200 is provided along the edge of the third positioning portion 1100.
  • the frame of the first supporting part further includes a third positioning groove 2100 and at least one fourth positioning groove 2200.
  • the third positioning part 1100 is located in the third positioning groove 2100, and each fourth positioning part 1200 is located in a corresponding fourth positioning groove.
  • the fourth positioning portion 1200 is located on one side of the third positioning portion 1100 along the second direction.
  • the sides of each fourth positioning groove 2200 that are opposite to each other in the second direction and the sides of the corresponding fourth positioning portion 1200 that are opposite to each other in the second direction are not in contact with each other.
  • the difference between the dimensions of the three positioning portions 1100 along the second direction is smaller than the difference between the dimensions of each fourth positioning groove 2200 and the corresponding fourth positioning portion 1200 along the second direction.
  • the fourth positioning part is a rough positioning part
  • the fourth positioning groove is a rough positioning groove. The cooperation of the rough positioning part and the rough positioning groove realizes the rough positioning of the first optical film in the second direction.
  • the embodiment of the present disclosure schematically shows that a third positioning portion and a fourth positioning portion are provided on a second sub-edge portion.
  • the third positioning portion and the fourth positioning portion may be relative to the second sub-edge portion.
  • the midpoints of the parts are approximately symmetrically distributed.
  • a plurality of fourth positioning portions may be provided on a second sub-edge portion, and the plurality of fourth positioning portions are all located on the same side of the third positioning portion, and the third positioning portion and the plurality of fourth positioning portions are located on the same side of the third positioning portion.
  • the second sub-edges are approximately evenly distributed.
  • the embodiments of the present disclosure are not limited to this.
  • the multiple fourth positioning portions are all located on the same side of the third positioning portion, from being close to the third positioning portion to away from the third positioning portion .
  • the size difference between each fourth positioning groove and the corresponding fourth positioning portion along the second direction may gradually increase.
  • the difference between the size of each fourth positioning groove and the corresponding fourth positioning portion in the second direction may include at least one of an expansion pitch and a contraction pitch.
  • the expansion distances corresponding to the fourth positioning parts gradually increase, and/or, the plurality of fourth positioning parts correspond to the The shrinking distance gradually increases.
  • a plurality of second positioning grooves 220 are provided in one-to-one correspondence with the second positioning portions 120 located on the second sub-edge portion 102, and the number of the second positioning grooves 220 corresponds to that of the second positioning portions.
  • the number of 120 is the same, and each second positioning portion 120 is located in the corresponding second positioning groove 220.
  • the two inner sides of the corresponding fourth positioning grooves that are close to the two sides of each fourth positioning portion on the second sub-edge portion 102 are close to each other. There is a gap between them along the second direction. That is, the rough positioning part located in the rough positioning groove does not contact the rough positioning groove in the second direction.
  • the two inner sides of the corresponding third positioning groove that are close to the two side sides of each third positioning portion may have a gap or no gap along the second direction.
  • the third positioning groove 2100 located on the frame includes two inner sides opposite to each other in the Z direction.
  • the third positioning portion 1100 located on the second sub-edge portion 102 is located within the two inner sides, and there are two intervals between the third positioning portion 1100 and the two inner sides, namely the interval P1 and the interval P2.
  • the embodiment of the present disclosure is not limited to this, and the third positioning portion 1100 and the two inner sides of the third positioning groove 2100 may only have a gap P2, that is, P1 may be zero.
  • each second positioning groove 220 included in the second positioning groove 220 located on the frame also includes two inner sides opposite to each other in the Z direction, and the second positioning portion 120 located on the second sub-edge portion 102 is located here Inside the two inner sides, and there are two intervals between the second positioning portion 120 and the two inner sides, namely, a gap G1 and a gap G2.
  • the size of the interval G1 in the second direction may be a contraction interval
  • the size of the interval G2 in the second direction may be an expansion interval.
  • there are two intervals in the Z direction between each positioning part and the corresponding positioning groove there are two intervals in the Z direction between each positioning part and the corresponding positioning groove. One of the two intervals provides expansion space for the first optical film, and the other is the first optical film.
  • the film provides shrinking space.
  • the positioning portion of the first optical film and the first middle frame Sufficient expansion space or contraction space is provided between the positioning grooves, so that the first optical film can be prevented from being obstructed by the first middle frame during the expansion or contraction process to cause wrinkles.
  • the sum of the distances between the adjacent sides of each fourth positioning portion 1200 and the corresponding fourth positioning groove 2200 in the second direction is greater than that of the third positioning portion 1100 and The sum of the distances between the sides of the corresponding third positioning grooves 2100 that are close to each other along the second direction.
  • the sum of the spacing P1 and the spacing P2 between the third positioning portion 1100 located on the second sub-edge portion 102 and the corresponding third positioning groove 2100 in the second direction is smaller than that located on the second sub-edge portion 102
  • the opening 12 of the second positioning portion 120 near the first sub-edge portion of the third positioning portion 1100 may be spaced from the boss 221 away from the third positioning portion 1100 in the second direction.
  • the distance P1 between the side of the third positioning portion 1100 away from the fourth positioning portion 1200 and the corresponding side of the third positioning groove 2100 may be small, or even zero.
  • the distance P1 between the side of the third positioning portion 1100 away from the side of the fourth positioning portion 1200 and the corresponding side of the third positioning groove 2100 is smaller than the side of the third positioning portion 1100 close to the fourth positioning portion 1200 and the third positioning groove
  • the interval P2 between the corresponding sides of the 2100 to realize the precise positioning of the first optical film in the second direction; the two intervals G1 between the two sides of the fourth positioning portion 1200 and the corresponding fourth positioning groove 2200 And G2 are both greater than the interval P1. Therefore, the second positioning portion and the third positioning portion in the embodiment of the present disclosure jointly serve as a fine positioning portion, and the fourth positioning portion is used as a coarse positioning portion.
  • the combination of fine positioning and coarse positioning is adopted between the second sub-edge portion of the first optical film extending in the second direction and the frame of the first middle frame extending in the second direction, which can ensure The fixation of the first optical film and the first middle frame can also ensure that the first optical film under a high temperature and high humidity environment is not prone to wrinkles in the second direction, and does not affect normal display.
  • a fine positioning portion and at least one coarse positioning portion may be provided on the second sub-edge portion, so that the first optical film can be exposed to a high temperature environment. Take the fine positioning part as the center and expand to one side; or make the part of the first optical film on one side of the fine positioning part shrink towards the fine positioning part in a low temperature environment.
  • the embodiments of the present disclosure are not limited to this.
  • the coarse positioning portions can also be arranged on both sides of the fine positioning portion to minimize the second sub-edge portion. The size change of the second sub-edge portion of an optical film when it expands or contracts.
  • the ground is used as a reference, and the arrow in the Z direction points to The direction is upward.
  • the first sub-edge portion is horizontally arranged
  • the second sub-edge portion is vertically arranged.
  • the interval P2 and the interval G2 are the intervals for providing the expansion space for the first optical film 100
  • the interval P1 and the interval G1 are the intervals for providing the contraction space for the first optical film 100 as Examples are described.
  • the vehicle-mounted environment where the backlight module is located is reduced from room temperature to the lowest temperature.
  • the temperature difference is 65°C
  • the temperature difference from room temperature to the highest temperature is 70°C.
  • ⁇ T1 in the above relational expression represents the high-temperature temperature difference of the vehicle-mounted environment in which the first optical film 100 is located. As shown in FIG.
  • the distance between the protruding portion of the first sub-edge portion 101 of the first sub-edge portion 101 in the second direction away from the side edge of the third positioning portion 1100, and CET2 represents the thermal expansion coefficient of the first optical film 100 in the second direction.
  • the thermal expansion coefficient CET2 of the first optical film 100 along the second direction is related to the temperature range in which the first optical film 100 is located.
  • the thermal expansion coefficient CET2 of the first optical film 100 at 75°C to 95°C The value is greater than the value of the thermal expansion coefficient CET2 of the first optical film 100 at 50°C to 75°C, and the value of the thermal expansion coefficient CET2 of the first optical film 100 at 50°C to 75°C is greater than that of the first optical film 100
  • ⁇ T2 in the above relational expression represents the low-temperature temperature difference of the vehicle-mounted environment where the first optical film 100 is located, and V2 represents the protruding portion of the third positioning portion 1100 from the edge of the third positioning portion 1100 close to the fourth positioning portion 1200 to the first sub-edge portion 101.
  • V3 represents the distance from the edge of the fourth positioning portion 1200 close to the third positioning portion 1100 to the side edge of the protruding portion of the first sub-edge portion 101 that is away from the third positioning portion 1100 in the second direction.
  • V4 indicates that the protruding portion of the fourth positioning portion 1200 away from the third positioning portion 1100 to the first sub-edge portion 101 (the first sub-edge portion close to the third positioning portion) is away from the third positioning portion 1100 in the second direction The distance between the edges on one side.
  • the width of each interval mentioned above is not only related to the gap between expansion and contraction requirements, but also related to the cutting tolerance (DBEF) of the first optical film 100 and the injection molding tolerance (DMF) of the first middle frame 200.
  • DBEF cutting tolerance
  • DMF injection molding tolerance
  • the cutting tolerance of the first optical film 100 depends on the tolerance zone corresponding to the position and size of each interval
  • the injection tolerance of the first middle frame 200 depends on the tolerance zone corresponding to the position and size of each interval.
  • the cutting tolerance of the first optical film 100 is approximately 0.2 mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15 mm
  • V1 It is approximately 51mm
  • the shrinkage required gap is approximately 0.2mm
  • the interval P1 should not be less than 0.55mm.
  • the interval P1 can be 0.6mm as a fine positioning position.
  • the cutting tolerance of the first optical film 100 is approximately 0.2 mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15 mm
  • the expansion required gap is roughly 0.3mm, so the interval P2 should not be less than 0.65mm, for example, the interval P2 can be 1.5mm.
  • the cutting tolerance of the first optical film 100 is approximately 0.2 mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15 mm
  • V3 It is roughly 165mm
  • the shrinkage required gap is roughly 0.6mm
  • the interval G1 should not be less than 0.95mm, for example, the interval G1 can be 1.5mm.
  • the cutting tolerance of the first optical film 100 is approximately 0.1 mm
  • the injection tolerance of the first middle frame 200 is approximately 0.15 mm
  • the expansion required gap is roughly 0.79mm, so the gap G2 should not be less than 1.04mm, for example, the gap G2 can be 1.5mm.
  • the third positioning portion 1100 located on the second sub-edge portion 102 includes a third protrusion 112
  • the fourth positioning portion 1200 located on the second sub-edge portion 102 includes a fourth protrusion. ⁇ 122.
  • the contour edge (the second sub-edge portion) where the third protrusion 112 and the fourth protrusion 122 are located includes a protrusion and a linear connecting portion located between adjacent protrusions, thereby, The plurality of protrusions and the plurality of connecting parts are connected end to end to form a contour edge in the shape of a broken line.
  • the third protrusion and the fourth protrusion are both protrusions without openings.
  • the fourth protrusion may also be a protrusion with an opening.
  • the fourth positioning groove where the fourth protrusion is located needs to be provided with a boss corresponding to the opening, so that the opening can be sleeved on the boss.
  • FIG. 9 is a partial enlarged view of the E7 area of the backlight module shown in FIG. 4, and FIG. 10 is a partial enlarged view of the E8 area of the backlight module shown in FIG.
  • the ground is taken as a reference, and the direction indicated by the arrow in the Z direction is upward. At this time, the distance between the opening 12 of the second protrusion 121 of the second positioning portion 120 and the upper side of the boss 221 in the E2 area is zero.
  • the distance between the opening of the second protrusion on the upper side of the first optical film and the upper side of the corresponding boss is 0, the first optical film is hung on the boss, and the boss faces the first optical film.
  • the diaphragm plays a supporting role in the Z direction.
  • the interval I2 between the opening 12 of the second protrusion 121 of the second positioning portion 120 and the upper side edge of the boss 221 in the E8 area is used to provide the first optical film 100 with expansion space in the second direction.
  • the interval I1 between the opening 12 of the second protrusion 121 of the second positioning portion 120 and the lower side of the boss 221 in the E8 area is used to provide the first optical film 100 with a contraction space in the second direction.
  • the cutting tolerance (DBEF) of the first optical film 100 at the position of the second positioning portion 120 in the E8 area the injection tolerance (DMF) of the first middle frame 200, the expansion coefficient of the first optical film 100, and the backlight mold
  • the temperature difference of the environment where the group is located and the distance between the midpoint of the second positioning portion 120 in the E8 area and the edge of the second positioning portion 120 in the E2 area away from the edge of the E8 area can be calculated to obtain the value of the interval I2, which is approximately 1.35mm.
  • the value of the interval I1 is approximately 0.83mm.
  • the first middle frame 200 further includes a plurality of retaining walls 230 around the periphery.
  • Each of the plurality of retaining walls 230 includes two sub-retaining walls 231 arranged along the extension direction (first direction or second direction) of the frame where the retaining wall 230 is located, and a first positioning is provided between the two sub-retaining walls 231
  • the groove 210, the second positioning groove 220, the third positioning groove 2100, or the fourth positioning groove 2200 is the above-mentioned positioning groove.
  • the frame is obtained by digging a groove.
  • the interval between the two sub-retaining walls forms a recessed part, and the recessed part is configured to place the first protrusion.
  • the retaining wall provided around the first middle frame corresponds to the portion of the connecting portion between the two adjacent positioning portions of the first optical film, and the connecting portion extending in the first direction and the corresponding retaining wall
  • the interval is used to provide a deformation space for the first optical film to expand or contract in the first direction, so as to prevent the first optical film from deforming due to changes in ambient temperature from being hindered by the retaining wall on the first middle frame. Produce wrinkles.
  • the second positioning groove 220 between the two sub-retaining walls 231 in the E2 area-E4 area is provided with a boss 221, and the boss 221 is along the first optical film 100.
  • the length of the extension direction of a sub-edge portion 101 may be 9.49 mm
  • the width of the boss 221 may be 0.72 mm
  • the height of the boss 221 perpendicular to the first supporting surface 2010 may be 2 mm.
  • the boss 221 located in each of the second positioning grooves 220 may be approximately located in the middle of the second positioning groove 220 to facilitate the design of the interval between the second protrusion 121 and the boss 221.
  • the size of the boss 221 in each second positioning groove 220 is the same, and the groove length of each second positioning groove 220 along the extending direction of the first sub-edge portion 101 is the same, then by changing the second protrusion The size of the portion of 121 located on both sides of the opening 12 along the extending direction of the first sub-edge portion 101, so that the size of the reserved space between the second protrusion 121 and the boss 221 can be changed.
  • the length of the first positioning groove 210 between the two sub-retaining walls 231 in the E1 area along the extending direction of the first sub-edge portion 101 may be 25.2 mm, and the depth thereof may be 1.1 mm.
  • the length of the positioning groove between the two sub-retaining walls 231 in the E5 area-E6 area along the extension direction of the second sub-edge portion 102 of the first optical film 100 may be 26.2 mm, the depth can be 1.1mm.
  • the length of the first positioning groove 210 between the two sub-retaining walls 231 in the E5 area is the same as the length of the second positioning groove 220 in the E6 area, the length of the second positioning part located in the different positioning groove is adjusted.
  • the size of the extending direction of the sub-edge portion is such that the size of the interval between the different positioning grooves and the corresponding positioning portion is different, thereby realizing the combination of fine positioning and coarse positioning.
  • the ground is taken as a reference, and the direction pointed by the arrow in the Z direction is upward.
  • the first sub-edge portion is horizontally arranged
  • the second sub-edge portion is vertically arranged.
  • the shrinking space reserved when the first optical film 100 shrinks in the second direction for example, the value of the interval D may be approximately 1.5 mm.
  • the connecting portion 130 on the first sub-edge portion 101 located on the lower side of the first optical film 100 and the side edges of the corresponding sub-retaining wall 231 have The interval J is an expansion space reserved for the expansion of the first optical film 100 in the second direction.
  • the value of the interval J may be approximately 2 mm.
  • the interval F is an expansion space reserved for the expansion of the first optical film 100 in the first direction.
  • the value of the interval F may be 2.4-2.9 mm.
  • interval H there is an interval H between the connecting portion 130 located on the other second sub-edge portion 102 of the first optical film 100 and the opposite sides of the corresponding sub-retaining wall 231, and the interval H is for The expansion space reserved when the first optical film 100 expands in the first direction, for example, the value of the interval H may be 2.4-2.9 mm.
  • FIG. 11 is a schematic plan view of a second optical film according to an embodiment of the present disclosure
  • FIG. 12 is a schematic plan view of a second optical film and a first middle frame according to an embodiment of the present disclosure.
  • the backlight module further includes a second optical film 300
  • the second optical film 300 includes a plurality of second edge portions.
  • the second optical film 300 is located between the first optical film 100 and the first supporting surface 2010 of the first middle frame 200, and the first supporting surface 2010 is configured to support the second optical film 300 and the first optical film 100 .
  • the second optical film 300 may be a diffuser plate.
  • the thickness of the second optical film 300 is greater than the thickness of the first optical film 100.
  • the material of the second optical film 300 can be a light transmissive material such as polymethyl methacrylate (PMMA) or polycarbonate (PC). More than 90%.
  • the periphery of the second optical film 300 includes a plurality of recesses 310, and the plurality of recesses 310 are arranged in a one-to-one correspondence with the plurality of retaining walls 230, and each of the recesses 310 is configured to correspond to The corresponding retaining wall 230 is clamped to fix the second optical film 300.
  • each retaining wall 230 is a part protruding inwardly in the frame of the first supporting part 201
  • each recessed part 310 is a part recessed inwardly on the edge of the second optical film 300.
  • the position of the second optical film 300 is fixed by embedding the above-mentioned retaining wall 230 with the first support portion 201 protruding inward into the recess 310 of the second optical film 300.
  • the contour edge (ie, the second edge portion) of the second optical film is set to an irregular shape, that is, the contour edge of the second optical film is no longer simply a straight line, but is in line with the first center.
  • the fold line that the frame can match can directly realize the fixation of the second optical film and the first middle frame without double-sided tape. Thereby, a certain movement space can be reserved for the second optical film, which prevents the second optical film from being constrained by the first middle frame when it is expanded or contracted to produce wrinkles and other deformations that affect the display, and cause the display to be affected.
  • the second optical film 300 includes a plurality of contour edges (ie, a plurality of second edge portions) corresponding to the plurality of frames 202 of the first supporting portion 201 one-to-one.
  • the second optical film 300 includes four contour edges, and the four contour edges enclose a substantially rectangular second optical film as an example for description, but it is not limited thereto. As long as the multiple borders of the first middle frame correspond to the multiple contour edges of the second optical film one-to-one.
  • the plurality of contour edges of the second optical film 300 include a third sub-edge portion 301 extending in the first direction and a fourth sub-edge portion 302 extending in the second direction.
  • the length of the third sub-edge portion 301 is greater than the length of the fourth sub-edge portion 302.
  • the third sub-edge portion is a long side
  • the fourth sub-edge portion is a short side.
  • the third sub-edge portion 301 includes a plurality of recessed portions 310 and raised structures 320 located between adjacent recessed portions.
  • the plurality of recesses 310 and the plurality of protruding structures 320 are connected end to end to form a contour edge in the shape of a broken line.
  • the fourth sub-edge portion 302 is also a polyline-shaped contour edge formed by connecting a plurality of concave portions 310 and a plurality of convex structures 320 end to end.
  • the plurality of recesses 310 includes a first sub-recess 311 on the third sub-edge portion 301 and a plurality of second sub-recesses 312, which are located in the first sub-recess 311
  • the retaining wall 230 of is the first retaining wall
  • the retaining wall 230 located in the second sub-recess 312 is the second retaining wall.
  • the retaining wall 230 located on the frame 202 extending in the first direction includes two outer sides opposite to each other in the first direction, and a depression located on the third sub-edge portion 301
  • the portion 310 includes two inner sides opposite to each other in the first direction, and two outer sides of the retaining wall 230 corresponding to one recessed portion 310 are located in the two inner sides of the recessed portion 310.
  • the two sides of the corresponding retaining wall 230 that are close to each other with the two sides of each second sub-recess are spaced along the first direction.
  • the two sides of the corresponding retaining wall 230 that are close to each other with the two sides of each recessed portion 310 have an interval along the first direction, that is, there is a gap between each recessed portion and the retaining wall located in it.
  • one of the two spaces provides expansion space for the second optical film, and the other provides contraction space for the second optical film. Therefore, when the backlight module provided by the embodiments of the present disclosure is in a high temperature environment (for example, 50-100°C) or a low-temperature environment (for example, 0-40°C), the concave portion of the second optical film and the first middle frame Sufficient expansion or contraction space is provided between the retaining walls, so as to prevent the second optical film from being obstructed by the first middle frame and deformed during the expansion or contraction process.
  • a high temperature environment for example, 50-100°C
  • a low-temperature environment for example, 0-40°C
  • the width of the interval used to provide expansion space for the second optical film in the two intervals between each recessed portion and the corresponding retaining wall may be equal to the width of the space used to provide contraction space for the second optical film.
  • the width of the interval may be equal to the width of the space used to provide contraction space for the second optical film.
  • FIG. 13 is a partially enlarged view of the E9 area in the backlight module shown in FIG. 12, and FIG. 14 is a partially enlarged view of the E10 area in the backlight module shown in FIG.
  • the first sub-depressed portion 311 located on the third sub-edge portion 301 includes two inner sides opposite to each other in the first direction, and the first retaining wall is located in the two inner sides , And there is an interval K1 and an interval K2 between the first retaining wall and the two inner sides, respectively.
  • the sum of the dimensions along the first direction (that is, the sum of the interval K1 and the interval K2) is the fourth interval S4.
  • each second sub-recess 312 located on the third sub-edge portion 301 includes two inner sides opposite to each other in the second direction, each second retaining wall is located in the two inner sides, and the second retaining wall is connected to There is an interval L1 and an interval L2 between the two inner sides, respectively, and the size along the first direction between the second sub-recess 312 and the side edges of the corresponding retaining wall (ie, the second retaining wall) that are close to each other is smaller than that in the first direction.
  • the sum (that is, the sum of the interval L1 and the interval L2) is the fifth interval S5, that is, the difference between the dimensions of the second sub-recess 312 and the corresponding retaining wall in the first direction is the fifth interval S5.
  • the fourth distance S4 is smaller than the fifth distance S5. Therefore, the first sub-recess is a recess for fine positioning, and the second sub-recess is a recess for rough positioning.
  • the third sub-edge portion is an arc-shaped edge portion
  • the above-mentioned fourth and fifth intervals are dimensions along the extending direction of the arc-shaped edge portion.
  • the combination of fine positioning and coarse positioning is adopted between the second optical film and the first middle frame in the embodiments of the present disclosure, which can not only ensure the fixation of the second optical film and the first middle frame, but also ensure that the second optical film The film is not prone to wrinkles in a high temperature and high humidity environment, and does not affect the normal display.
  • the first sub-recess 311 is approximately located at the midpoint of the third sub-edge portion 301, and the plurality of second sub-recesses 312 are located on both sides of the first sub-recess 311.
  • the first recess as the fine positioning recess is roughly arranged at the midpoint of the third sub-edge portion of the second optical film, and a plurality of coarse positioning recesses are arranged on the fine positioning recess.
  • the second optical film can be made to expand to the left and right (rightward as an example in the X direction) in a high temperature environment with the fine positioning recess as the center; or the second optical film can be made to be in a low temperature environment ,
  • the parts on both sides of the fine positioning recessed part shrink toward the middle. As a result, it is possible to avoid wrinkles occurring when the long side of the second optical film expands or contracts.
  • the number of second sub-recesses 312 located on both sides of the first sub-recess 311 is equal, and the number of second sub-recesses 312 located on both sides of the first sub-recess 311 is equal.
  • the two sub-recesses 312 are symmetrically distributed with the first sub-recess 311 as the center. Therefore, it is possible to ensure that the third sub-edge portion of the second optical film is substantially symmetrically expanded or contracted in a high temperature or low temperature environment, so as to facilitate the setting of the relative positional relationship between the second optical film and the first middle frame.
  • the plurality of fifth spacings S5 corresponding to the plurality of second sub-concavities 312 gradually increase to ensure
  • the second optical film expands from the center to both sides.
  • the direction from the midpoint of the third sub-edge portion to the end points on both sides the closer to the edge of the second optical film, the greater the expansion of the second optical film. Therefore, the closer to the edge of the second optical film, the size of the space reserved between the second sub-recess and the corresponding retaining wall shows an increasing trend, which can ensure that the second optical film in each position is in a different position.
  • the temperature change in the vehicle environment causes expansion or contraction, there will be no deformation that affects the display such as wrinkles.
  • the embodiment of the present disclosure takes as an example that the frame of the first support portion 201 is provided with seven retaining walls 230 extending in the first direction.
  • the wall 230 (the retaining wall 230 in the E1 area) is the center, and the three retaining walls on the left and right sides are symmetrically distributed with respect to the fourth retaining wall.
  • the embodiment of the present disclosure does not limit the number of retaining walls, and can be adjusted according to the length and the curvature of the first middle frame. For example, along the direction perpendicular to the first supporting surface, the height of the retaining wall 230 may be 3.29 mm.
  • the backlight module is a curved backlight module
  • the length of the retaining wall 230 in the E4 area along the extension direction of the third sub-edge portion 301 It can be 68.22mm
  • the length of the retaining wall 230 in the E3 area along the extension direction of the third sub-edge portion 301 can be 69.33mm
  • the length of the retaining wall 230 in the E2 area along the extension direction of the third sub-edge portion 301 It may be 70.04 mm
  • the length of the retaining wall 230 in the E1 area along the extension direction of the third sub-edge portion 301 may be 69.21 mm.
  • the design with different lengths of the retaining walls at different positions can not only ensure that the first middle frame better maintains the uniformity of the curvature of the curved surface, improve the yield of the molding process, but also can be the second at different positions.
  • the optical film reserves enough space for contraction and expansion.
  • the embodiment of the present disclosure takes the third sub-edge portion of the second optical film 300 provided with 7 recesses corresponding to the 7 retaining walls 230 as an example.
  • the length of the second sub-recess 312 along the extension direction of the third sub-edge portion 301 may be 71.32 mm, and the size of the two distances between the second sub-recess 312 and the retaining wall 230 located therein may be 1.55 mm.
  • the length of the second sub-recess 312 in the E3 area along the extension direction of the third sub-edge portion 301 may be 71.72mm, the size of the two distances between the second sub-recess 312 and the retaining wall 230 located therein
  • the length of the second sub-recess 312 in the E2 area along the extension direction of the third sub-edge portion 301 can be 71.92 mm, and the second sub-recess 312 and the retaining wall 230 located therein have a length of 71.92 mm.
  • the size of the two spacings may both be 0.96 mm; the length of the first sub-depressed portion 311 in the E1 area along the extension direction of the third sub-edge portion 301 may be 70.79 mm, and the first sub-depressed portion 311 may be located in the same direction.
  • the size of the two spacings of the retaining wall 230 may both be 0.79 mm.
  • the coarse positioning concave parts on both sides are symmetrically distributed with respect to the fine positioning concave part, and the reserved value of the interval from the middle to the two sides is smaller
  • the space reserved between the sub-concavity and the corresponding retaining wall shows an increasing trend, which can ensure that the second optical film in each position will not be affected by wrinkles or other effects when it expands or contracts due to temperature changes in the vehicle environment. Deformation of the display.
  • each depression 310 located on the third sub-edge portion 301 toward the center of the second optical film 300 may be 3 mm.
  • FIG. 15 is a partial enlarged view of the E11 area of the backlight module shown in FIG. 12, and FIG. 16 is a partial enlarged view of the E12 area of the backlight module shown in FIG.
  • the plurality of recessed portions 310 includes a third sub-recess 313 and at least one fourth sub-recess 314 located on the fourth sub-edge portion 302, and at least one fourth sub-recess 314 is located on the fourth sub-edge portion 302.
  • the embodiment of the present disclosure schematically shows that a third sub-recess and a fourth sub-recess are provided on a fourth sub-edge portion.
  • the third sub-recess and the fourth sub-recess may be opposite to each other.
  • the midpoints of the fourth sub-edge are approximately symmetrically distributed.
  • a fourth sub-edge portion may be provided with multiple fourth sub-recesses, the multiple fourth sub-recesses are all located on the same side of the third sub-recess, and the third sub-recess and the multiple first sub-recesses The four sub-concave portions are approximately evenly distributed on the fourth sub-edge portion.
  • a frame extending in the second direction among the plurality of frames 202 is taken as an example.
  • the retaining wall 230 located on the frame includes two sides opposite to each other in the second direction, and
  • the third sub-recess 313 on the fourth sub-edge portion 302 is located outside the two sides, and there are two intervals between the third sub-recess 313 and the retaining wall, that is, the interval M1 and the interval M2.
  • one of the two spaces provided in the second direction between each recess and the corresponding retaining wall provides expansion space for the second optical film, and the other provides contraction space for the second optical film . Therefore, when the backlight module provided by the embodiment of the present disclosure is in a high temperature environment or a low temperature environment, sufficient expansion space or contraction space is provided between the second optical film and the retaining wall of the first middle frame, thereby preventing the first The second optical film is obstructed by the first middle frame during expansion or contraction, and wrinkles and other deformations that affect the display are generated.
  • the width of the interval that provides expansion space for the second optical film among the two intervals between the recesses and the corresponding retaining wall may be equal to that of the interval for the contraction space for the second optical film. width.
  • the sum of the dimensions in the second direction between the third sub-recess 313 and the side edges of the corresponding retaining wall 230 that are close to each other is smaller than that of the fourth sub-recess 314 and the corresponding retaining wall 230.
  • the sum of the size of the interval M1 and the interval M2 between the third sub-recess 313 and the corresponding retaining wall 230 in the second direction is smaller than the interval N1 and the interval between the fourth sub-recess 314 and the corresponding retaining wall 230
  • the sum of the dimensions of N2 in the second direction therefore, the third sub-recess 313 is a fine positioning recess, and the fourth sub-recess 314 is a coarse positioning recess.
  • the fourth sub-edge portion of the second optical film extending in the second direction and the frame of the first middle frame extending in the second direction adopt a combination of fine positioning and coarse positioning, which can ensure The fixation of the second optical film and the first middle frame can also ensure that the second optical film under a high temperature and high humidity environment is not prone to wrinkles in the second direction, such as deformation that affects the display, and does not affect the normal display.
  • one fine positioning recess and at least one coarse positioning recess may be provided on the fourth sub-edge portion, so that the diffuser can perform well in a high-temperature environment.
  • the fine positioning depression is centered and expands to one side; or the part located on one side of the fine positioning depression shrinks toward the fine positioning depression when spreading in a low temperature environment.
  • the embodiments of the present disclosure are not limited to this.
  • the coarse positioning recesses can also be placed on both sides of the fine positioning recesses to try to Reduce the size change of the second sub-edge portion of the first optical film when expansion or contraction occurs.
  • an example of the embodiment of the present disclosure is described by taking as an example that two retaining walls 230 are provided on the frame of the first supporting portion 201 extending in the second direction.
  • the height of the retaining wall 230 may be 3.29 mm.
  • the backlight module is a curved backlight module. It may be 74.76 mm, and the length of the retaining wall 230 in the E12 area along the extension direction of the fourth sub-edge portion 302 may be 77.46 mm.
  • the retaining wall in the E11 area is located on the upper side
  • the retaining wall in the E12 area is located on the lower side
  • the length of the retaining wall in the E12 area is greater than that of E11
  • the length of the retaining wall in the area can ensure that the first middle frame provides a better weighing function for the second optical film, so as to ensure that the second optical film can be used under high-intensity vibration conditions. Maintain stability.
  • the embodiment of the present disclosure takes as an example that the fourth sub-edge portion of the second optical film 300 is provided with two recessed portions corresponding to the two retaining walls 230 one-to-one.
  • the length of the third sub-recess 313 along the extension direction of the fourth sub-edge portion 302 may be 76 mm, and the size of the two intervals between the third sub-recess 313 and the retaining wall 230 located therein may both be 0.62 mm;
  • the length of the fourth sub-recess 314 in the E12 area along the extension direction of the fourth sub-edge portion 302 may be 79.2 mm, and the size of the two intervals between the fourth sub-recess 314 and the retaining wall 230 located therein may be Both are 0.87mm.
  • the third sub-concavity 313 in the E11 area is used as the fine positioning groove of the second optical film 300, and a coarse positioning groove is provided on one side of the fine positioning groove to ensure that the second optical film is in a high temperature and high humidity environment. , There is enough space for expansion and contraction along the extension direction of the fourth sub-edge, and it is not prone to wrinkles and other deformations that affect the display.
  • each depression 310 located on the fourth sub-edge portion 302 toward the center of the second optical film 300 may be 3.2 mm.
  • a fifth positioning groove 240 is included between two adjacent retaining walls 230 among the plurality of retaining walls 230, and a fifth positioning groove 240 is included between two adjacent ones of the plurality of concave portions 310.
  • the protrusion structure 320 is included, and the protrusion structure 320 is located in the fifth positioning groove 240.
  • the length of the recess 310 located on the third sub-edge portion 301 of the second optical film 300 along the first direction is smaller than that of the protrusion located on the third sub-edge portion 301
  • the size of the structure 320 along the first direction is greater than the size of the convex structure 320 located on the fourth sub-edge portion 302 in the second direction.
  • the fifth positioning groove 240 formed between two adjacent retaining walls 230 arranged on the frame extending in the second direction of the first middle frame 200 is positioned along the second direction.
  • the length can be 25.58mm.
  • a glue may be arranged between the second optical film and the first supporting surface to bond the second optical film to the first middle frame.
  • the glue material may be located in the middle of the third sub-edge portion of the second optical film, so as to reduce the influence of the position of the glue material on the deformation tendency of the second optical film when it expands or contracts.
  • FIG. 17 is a partial cross-sectional view of a backlight module including a backplane provided according to an embodiment of the present disclosure.
  • the backlight module is a curved backlight module.
  • the backlight module may also be a non-curved backlight module.
  • the backlight module further includes a back plate 400, at least part of the back plate 400 is located on the side of the first middle frame 200 away from the first optical film 100.
  • the back plate 400 includes a bottom plate 410 and a side plate 420 arranged on the edge of the bottom plate 410.
  • the first middle frame 200 is connected to the bottom plate 410.
  • the bottom plate 410 includes a bottom wall 411 and a second support portion 413 located outside the edge of the bottom wall 411.
  • the supporting portion 413 is located on the side of the bottom wall 411 facing the first optical film 100
  • the second supporting portion 413 has a second supporting surface 4130 facing the first optical film 100
  • the first supporting portion 201 is disposed on the second supporting portion 413 On the second supporting surface 4130.
  • the above-mentioned "the first middle frame is connected to the bottom plate of the backboard" means that the first middle frame is in contact with the bottom plate, and in at least one direction, the first middle frame is fixedly connected to the bottom plate.
  • the first support portion may be fixedly connected to the second support portion by a fixing member, and the fixing member extends in a direction perpendicular to the first support surface so that the first support portion and the second support portion are perpendicular to the first support surface.
  • Fixed connection in the direction may be the fixing member may be a structure such as nylon rivets, screws, etc., which is not limited in the embodiment of the present disclosure.
  • the bottom plate 410 and the side plates 420 of the back plate 400 form an accommodating space to accommodate components such as the first middle frame 200 and the first optical film 100.
  • the bottom plate 410 further includes a bottom plate connection portion 412 connecting the edge of the bottom wall 411 and the second support portion 413, and the second support portion 413 extends outward from the edge of the bottom plate connection portion 412.
  • a light source assembly (light source assembly 600 shown in FIG. 23) and a reflective sheet 500 may also be provided on the bottom wall 411 of the back plate 400 facing the first optical film 100.
  • the light source assembly is located on the reflective sheet.
  • the sheet 500 is away from the side of the first optical film 100.
  • the light source assembly may include a plurality of light emitting diodes arranged in an array along a first direction and a second direction.
  • the reflective sheet 500 is located on the light-emitting surface of the light source assembly and exposes the light-emitting diodes, that is, the reflective sheet 500 includes an opening area 520 corresponding to the light-emitting diodes to expose the light-emitting diodes, so that the light emitted by the light-emitting diodes will not be blocked by the reflective sheet.
  • the bottom plate connecting portion 412 may have a structure surrounding the bottom plate 410, and the bottom plate connecting portion 412 is used to form a light mixing cavity between the light source assembly and the first optical film 100 so that the light source assembly and the first optical film 100 are separated from each other. A certain mixing distance is formed between.
  • the bottom wall 411 has a curved structure for maintaining a predetermined curvature of the backlight module.
  • the bottom wall 411 may include long sides opposite to each other, and the long sides may be concavely curved, that is, the edge of the bottom wall 411 is curved toward the side facing the first optical film 100.
  • the connecting portion may only be provided at the position of the two long sides of the bottom wall, that is, the connecting portion connected to the bottom wall is not provided at the other side positions of the bottom wall, and the second supporting portion only includes those corresponding to the two long sides. Bending part.
  • the back plate in the embodiments of the present disclosure may be formed by an integral die-casting or stamping forming process
  • the bottom plate of the back plate may be an integrally formed structure, that is, the bottom wall, the connecting portion, and the second supporting portion are integrally formed structures.
  • the back plate can be formed by a stamping process.
  • the resilience is relatively large, and additional structures (such as arc-shaped stiffeners) are required to ensure curvature;
  • the back plate can also be formed by a die-casting process ( The molten iron flows into the designed model, and is cooled and molded) to reduce the rebound rate and dehydration rate of the material after molding.
  • the bottom plate connecting portion 412 is located at the edge of the bottom wall 411 and extends toward the side of the bottom wall 411 facing the first optical film 100.
  • the end of the bottom plate connection portion 412 away from the bottom wall 411 is located outside the connection position of the bottom plate connection portion 412 and the bottom wall 411 to facilitate the integral molding of the bottom wall 411 and the bottom wall 411.
  • the side plate 420 of the back plate 400 extends from the outer edge of the second support portion 413 toward the first optical film 100.
  • the side plate 420 may be a ring structure surrounding the first optical film 100 once.
  • the first supporting part 201 includes a first part for supporting the first optical film 100 and a second part contacting the second supporting part 413 of the bottom plate 410.
  • a first support surface 2010 is provided on a side of the first support portion 201 facing the first optical film 100, and the second portion of the first support portion 201 extends in a direction substantially perpendicular to the first support surface 2010 and is aligned with The second supporting portion 413 contacts, and the second supporting portion 413 supports the second part of the first supporting portion 201 to support the first middle frame 200.
  • the second supporting surface 4130 of the second supporting portion 413 of the bottom plate 410 is fixedly connected to the first supporting portion 201 of the first middle frame 200, that is, the first supporting portion 201 of the first middle frame 200 is fixed to the second supporting portion 201 of the bottom plate 410.
  • the support part 413 is on.
  • the first part of the first supporting part 201 is fixed on the second supporting part 413 of the bottom plate 410.
  • the first middle frame 200 further includes an extension part 250 connected to the first support part 201, the extension part 250 extends in a direction close to the bottom wall 411, and the extension part 250 is away from the first support part 201 The end presses against the periphery of the reflective sheet 500.
  • the extension portion included in the first middle frame is fixedly connected to the second support portion, the extension portion included in the first middle frame is pressed against the reflective sheet provided on the bottom wall to further The first middle frame is fixed to prevent the first support portion from turning over and ensure the stability of the first middle frame.
  • extension part is pressed against the reflective sheet, which means that the extension part is in contact with the reflective sheet, so that while the bottom wall supports the extension part, the extension part fixes the reflective sheet and prevents the periphery of the reflective sheet.
  • FIG. 1 The figure schematically shows that the end of the extension part away from the first support part is pressed against the reflector sheet, and the extension part in the actual product is in contact with the surface of the reflector sheet.
  • the edge connecting the extension part 250 and the first support part 201 is located outside the edge of the extension part 250 pressed against the reflective sheet 500, and the edge connecting the extension part 250 and the first support part 201 is located
  • the extension part 250 presses the end of the reflection sheet 340 close to the side of the display panel 10, so that the inner surface of the extension part 250 is formed as an inclined surface, and the inclined surface functions as a reflection surface.
  • the reflectivity of the inclined surface is not less than the reflectivity of the reflective sheet, so as to increase the utilization rate of the light emitted by the light source assembly and improve the light efficiency.
  • the reflective film is pressed to form a light mixing space between the light source assembly and the first optical film.
  • the material of the reflective sheet 500 has flexible characteristics, and it is arranged on the curved bottom wall 411 to form a curved reflective sheet with a certain curvature.
  • the first middle frame 200 is made of a material that has a certain degree of hardness and flexibility.
  • the material of the first middle frame 200 may be a material mixed with 10% glass fiber in polycarbonate (PC), so as to ensure that the first middle frame has a predetermined hardness.
  • the reflective sheet 500 disposed on the bottom wall 411 includes two sub-reflective sheets, the two sub-reflective sheets are arranged along a first direction, and each sub-reflective sheet is passed through a plastic material (such as double-sided tape). Fitting) and fixing elements (such as nylon rivets) are fixed on the curved bottom wall 411.
  • the reflective sheet 500 is spliced in segments, and the joint between the two sub-reflective sheets is attached to the bottom wall 411 with double-sided tape.
  • the above-mentioned segmented design can ensure that the reflective sheet 500 is not easy on the curved bottom wall 411. There is a bumpy situation.
  • push-in self-locking nylon rivets can be used to fix the reflective sheet 500 and the light source assembly (such as a light bar) on the curved bottom wall 411 of the back plate 400.
  • the fixing holes provided in the reflective sheet 500 for penetrating nylon rivets are arranged in an array along the first direction and the second direction.
  • the interval between two adjacent fixing holes 510 arranged in the first direction may be 72 mm.
  • the interval between two adjacent fixing holes arranged in the second direction may be 96 mm.
  • the edge of the reflective sheet 500 extending along the extension direction of the curved long side of the bottom wall 411 may be provided with a T-shaped groove 530, which is used to avoid the adapter plate connector (not shown) of the light source assembly.
  • the position connected with the light bar connector (not shown) avoids structural interference between the reflector and the connector and other structures.
  • Figures 19-20 are two side views of the back plate
  • Figure 21 is a schematic diagram of the positional relationship between the first optical film and the first middle frame and the back plate
  • Figure 22 is the second optical film and the first middle frame
  • 19 is a side view of the back plate outside the second sub-edge portion of the first optical film
  • FIG. 20 is a side view of the back plate outside the first sub-edge portion of the first optical film.
  • the side plate 420 is located outside the first supporting portion 201 and surrounds the first middle frame 200.
  • the side panel 420 includes a first side panel frame extending in the first direction and a second side panel frame extending in the second direction.
  • the first side panel frame is located outside of the frame extending in the first direction of the first middle frame 200.
  • the second side panel frame is located outside the frame extending in the second direction of the first middle frame 200, and the length of the first side panel frame is greater than the length of the second side panel frame.
  • the side panel includes two first side panel frames and two second side panel frames as an example, the above-mentioned four side panel frames enclose the side panels of the back panel, and the side panels of the back panel surround the first support portion .
  • the multiple first avoidance grooves 421 provided on the side plate 420 include a part on the first side plate frame and another part on the second side plate frame.
  • a plurality of first avoiding grooves 421 on the first side plate frame extending along the first direction are opposite to the second positioning grooves 220, and the second positioning portion 120 is located in the first A part of the orthographic projection on the plane where the supporting surface is located is located in the corresponding second positioning groove 220 and the first avoiding groove 421. That is, the second positioning portion 120 extends into the first avoiding groove 421 after passing through the corresponding second positioning groove 220.
  • the portion of the first avoiding groove 421 close to the outer edge is not covered by the second positioning portion 120, and a certain gap is still reserved to reserve an expansion space when the first optical film expands.
  • the first sub-edge portion 101 of the first optical film 100 is provided with a first positioning portion 110 (that is, the first The protrusion 111) and the three second positioning portions 120 (that is, the second protrusion 121 including the opening 12) respectively located on both sides of the first positioning portion 110, and the frame extending along the first direction of the first middle frame 200 is provided
  • the first side plate frame extending along the first direction of the side plate 420 of the back plate 400 may be provided with six first avoiding grooves 421 corresponding to the six second positioning grooves 220 one-to-one for the first optical film 100
  • the second protrusion 121 avoids the position. That is, the second protrusion 121 protrudes in a direction away from the center of the first optical film 100, passes through the second positioning groove of the frame of the first middle frame 200, and extends to the notch provided on the side plate 420 (that is, the first Avoid position slot 421).
  • the first protrusion 111 of the first optical film 100 protrudes away from the center of the first optical film 100, but does not exceed the first positioning groove 210 of the first middle frame 200, and the first protrusion extends along the second
  • the dimension in the direction is smaller than the dimension in the second direction of the second protrusion including the opening (the dimension includes the dimension of the opening). Therefore, the side plate 420 is not provided with a relief groove at a position directly opposite to the first protrusion 111.
  • the width of the first relief groove 421 along the first direction of the first side plate frame extending along the first direction may be 28mm, and the first relief groove 421 extends along a vertical direction to the first supporting surface 2010.
  • the depth of the direction may be 2.3 mm.
  • the positions of the three first avoiding grooves 421 on the side of the first protrusion 111 are respectively the first side. At a position of 1/15 of the length of the board frame, at a position of 1/4 of the length of the first side board frame, and at a position of 1/3 of the length of the first side board frame.
  • the first relief groove 421 located on the second side plate frame extending in the second direction is opposite to the third positioning groove 2100 or the fourth positioning groove 2200
  • the third positioning portion A part of the orthographic projection of 1100 on the plane of the first supporting surface 2010 is located in the third positioning groove 2100 and the corresponding first avoidance groove 421
  • the orthographic projection of the fourth positioning portion 1200 on the plane of the first supporting surface 2010 is A part is located in the corresponding fourth positioning groove 2200 and the first avoiding groove 421. That is, the third positioning portion 1100 extends into the corresponding first avoidance groove 421 after passing through the third positioning groove 2100, and the fourth positioning portion 1200 extends into the corresponding first avoidance groove 421 after passing through the fourth positioning groove 2200 .
  • the portion of the first avoiding groove 421 near the outer edge is not covered by the second positioning portion 120, the third positioning portion 1100, or the fourth positioning portion 1200, and a certain gap is reserved for the first optical film. Reserve room for expansion when expanding.
  • the second sub-edge portion 102 of the first optical film 100 is provided with a third positioning portion 1100 (that is, the third protrusion 112) And a fourth positioning portion 1200 (that is, the fourth protrusion 122) located on the side of the third positioning portion 1100, and the frame extending in the second direction of the first middle frame 200 is provided with a third positioning portion One third positioning groove 2100 of 1100 and one fourth positioning groove 2200 for placing one fourth positioning portion 1200 respectively.
  • the second side plate frame extending in the second direction of the side plate 420 of the back plate 400 is provided with two first avoiding grooves 421 corresponding to the above two positioning grooves one-to-one for the first optical film 100.
  • Avoidance of the three protrusions 112 and the fourth protrusion 122 avoidance of the three protrusions 112 and the fourth protrusion 122. That is, the third protrusion 112 and the fourth protrusion 122 protrude in a direction away from the center of the first optical film 100, pass through the positioning groove of the frame of the first middle frame 200, and extend to the notch provided in the side plate 420 (Ie the first avoidance slot 421).
  • the width of the first relief groove 421 along the second direction that is provided on the second side plate frame extending along the second direction may be 26mm, and the first relief groove 421 extends along a vertical direction to the first supporting surface 2010.
  • the depth of the direction may be 2.1mm.
  • the positions of the two first avoidance grooves 421 provided on the second side plate frame extending in the second direction are respectively 1/3 of the length of the second side plate frame, and the position of the first side plate frame 2/3 of the length.
  • the side plate 420 further includes a plurality of second avoiding grooves 422, and each of the second avoiding grooves 422 is located on the second side plate frame extending in the second direction and is connected to the second side plate frame.
  • the fifth positioning groove 240 of a middle frame 200 is opposite, and a part of the orthographic projection of the convex structure 320 on the plane where the first supporting surface 2010 is located is located in the corresponding fifth positioning groove 240 (that is, the interval between the two retaining walls) And the second avoidance slot 422.
  • the outer edge of the second relief groove 422 is flush with the outer edge of the protruding structure 320.
  • the side extending along the second direction of the second optical film 300 is provided with a convex structure 320, and the first middle frame 200
  • the frame extending in the second direction is provided with a fifth positioning groove 240 for placing a protruding structure 320.
  • the second side plate frame extending in the second direction of the side plate 420 of the back plate 400 is provided with a second avoiding groove 422 corresponding to the above-mentioned fifth positioning groove 240 for the protrusion of the second optical film 300 Avoidance of structure 320.
  • the protruding structure 320 protrudes in a direction away from the center of the second optical film 300, passes through the fifth positioning groove of the frame of the first middle frame 200, and extends to the notch provided by the side plate 420 (that is, the second avoidance Bit slot 422).
  • the width of the second avoidance groove 422 along the second direction of the second side plate frame extending in the second direction may be 27 mm, and the second avoidance groove 422 extends along an axis perpendicular to the first supporting surface 2010.
  • the depth of the direction may be 4.8 mm. Since the second optical film is located between the first optical film and the first middle frame, the depth of the second avoiding groove used to avoid the convex structure of the second optical film is greater than that of the first optical film The depth of the first avoiding groove of each protrusion avoiding position is deeper.
  • the second side plate frame of the side plate 420 extending in the second direction includes two first avoiding grooves 421 and one second avoiding groove 422, and the second avoiding grooves 422 is located between the two first avoidance slots 421.
  • the second relief slot 422 is located in the middle of the second side plate frame, and the three relief slots on the second side plate frame are arranged at equal intervals.
  • FIG. 23 is an exploded schematic diagram of a display device provided according to an embodiment of the present disclosure.
  • the display device may be a curved display device.
  • the curved display device in addition to the backlight module 30 shown in FIGS. 1 to 22, the curved display device also includes a front frame 40, a display panel 10, and a second middle frame 20.
  • the front frame 40 is located on the display side of the display panel 10, and the second middle frame 20 and the backlight module 30 are located on the non-display side of the display panel 10.
  • the embodiment of the present disclosure is described by taking the backplane 400 as the structure in the backlight module as an example.
  • the backplane may also be a structure outside the backlight module and be the backplane of the display device.
  • the first middle frame located in the backlight module in the embodiment of the present disclosure may be another middle frame in the display device. Therefore, the display device provided by the embodiment of the present disclosure includes two middle frames. It is disclosed that by arranging two middle frames in the curved display device, and only fixing the first middle frame on the bottom plate of the backplane, the assembly tolerance can be minimized, and the curvature accuracy of the display device can be improved.
  • the display panel included in the curved display device may be a liquid crystal display panel.
  • the liquid crystal display panel may include an array substrate (not shown), a counter substrate (not shown), and a liquid crystal layer (not shown) between the array substrate and the counter substrate.
  • the side of the array substrate facing the counter substrate may include a plurality of gate lines extending in one direction and a plurality of data lines extending in the other direction, and the plurality of gate lines and the plurality of data lines are intersected to define the array arrangement Of multiple pixel units.
  • Each pixel unit may include a pixel electrode and a thin film transistor.
  • the gate line is connected to the gate of the thin film transistor to control the on or off of the thin film transistor.
  • the pixel electrode is connected to one of the source and drain of the thin film transistor.
  • the data line is connected to the source of the thin film transistor.
  • the other of the drains is connected, and the data line inputs the voltage signal required for displaying the picture to the pixel electrode through the thin film transistor to realize the display of the array substrate.
  • the counter substrate may be a color filter substrate
  • the side of the color filter substrate facing the array substrate may be provided with a color filter layer corresponding to the pixel unit and a black matrix covering a structure located in a non-display area such as gate lines and data lines.
  • the side of the color filter substrate facing the array substrate may also be provided with a common electrode opposite to the pixel electrode, and the common electrode is configured to apply a common voltage to the pixel electrode to generate an electric field that drives the deflection of liquid crystal molecules in the liquid crystal layer.
  • the liquid crystal molecules are deflected to change the transmittance of the liquid crystal layer, thereby realizing the display of the desired grayscale image.
  • the display panel 10 may further include a first polarizer disposed on a side of the array substrate away from the counter substrate and a second polarizer disposed on a side of the counter substrate away from the array substrate.
  • the first polarizer includes a transmission axis extending in a first direction and polarizes the backlight incident therein in the first direction.
  • the second polarizer includes a transmission axis extending in the second direction and polarizes light incident on the second polarizer in the second direction.
  • the transmission axis of the first polarizer and the transmission axis of the second polarizer are perpendicular to each other.
  • the backlight module 30 provided by the embodiment of the present disclosure may be a direct type backlight module, including a light source assembly 600, a first optical film 100 located between the light source assembly 600 and the display panel 100, and a first optical film 100 between the light source assembly 600 and the display panel 100.
  • the second optical film 300, the first middle frame 200 and the reflective film 500 may be a direct type backlight module, including a light source assembly 600, a first optical film 100 located between the light source assembly 600 and the display panel 100, and a first optical film 100 between the light source assembly 600 and the display panel 100.
  • the second optical film 300, the first middle frame 200 and the reflective film 500 may be a direct type backlight module, including a light source assembly 600, a first optical film 100 located between the light source assembly 600 and the display panel 100, and a first optical film 100 between the light source assembly 600 and the display panel 100.
  • the second optical film 300, the first middle frame 200 and the reflective film 500 may be a direct type backlight module, including a light source assembly 600,
  • the curved display device provided by the embodiment of the present disclosure may be an in-vehicle curved display device applied to a car.
  • the combination of fine positioning and coarse positioning between the first optical film and the first middle frame can ensure that the first optical film and the first optical film are combined with coarse positioning.
  • the fixing of a middle frame can also ensure that the first optical film is not prone to wrinkles in a high-temperature and high-humidity environment, and does not affect the normal display of the display device.
  • the combination of fine positioning and coarse positioning adopted between the first optical film and the first middle frame, and the second optical film and the first middle frame are combined.
  • the combination of fine positioning and rough positioning used between the first middle frame can not only ensure the fixation of the first optical film, the second optical film and the first middle frame, but also ensure that the first optical film and the second optical film are fixed.
  • the sheet is not prone to wrinkles and other deformations that affect the display in a high temperature and high humidity environment, and does not affect the normal display of the display device.
  • Another example of the embodiment of the present disclosure provides that when the display device is applied in a vehicle-mounted environment, the combination of fine positioning and coarse positioning adopted between the first optical film and the first middle frame, and the second optical film and the first
  • the combination of fine positioning and coarse positioning between the middle frames, and the segmented splicing of the reflector can ensure the stability of various diaphragm fixing structures and avoid scratches, white spots, and jumps under vehicle-level vibration conditions. And other bad issues.
  • it can also effectively solve the stress generated by the curved structure, the film material wrinkles, warping and other undesirable problems in the car-level high temperature and humidity environment, simplify the product process flow, and improve the product quality.
  • Another embodiment of the present disclosure provides a vehicle including any of the above-mentioned curved display devices.
  • vehicles may include vehicles, airplanes, ships, subways, and other vehicles that carry people or transport goods.
  • the motor vehicle may be a vehicle such as a car or a truck.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un module de rétroéclairage, un dispositif d'affichage et un véhicule. Le module de rétroéclairage comprend un premier film optique (100) et un cadre de support (200) supportant le premier film optique (100). Le cadre de support (200) comprend une première partie de support (201), au moins une bordure (202) de la première partie de support (201) comprend une première rainure de positionnement (210) et une seconde rainure de positionnement (220), au moins une première partie de bord du premier film optique (100) comprend une première partie de positionnement (110) et une seconde partie de positionnement (120), la première partie de positionnement (110) étant située dans la première rainure de positionnement (210), et chaque seconde partie de positionnement (120) étant située dans la seconde rainure de positionnement correspondante (220). Sur chaque bordure (202) et la première partie de bord correspondante, la différence entre les dimensions de la première rainure de positionnement (210) et la première partie de positionnement (110) dans la direction d'extension de la bordure (202) est inférieure à la différence entre les dimensions de chaque seconde rainure de positionnement (220) et la seconde partie de positionnement correspondante (120) dans la direction d'extension de la bordure (202). Un espace d'expansion ou de contraction suffisant est prévu entre la partie de positionnement (110/120) du premier film optique (100) et de la rainure de positionnement correspondante (210/220) pour empêcher le premier film optique (100) d'être plissé en raison de l'effet de blocage du cadre de support pendant l'expansion ou la contraction.
PCT/CN2020/093954 2019-12-20 2020-06-02 Module de rétroéclairage, dispositif d'affichage et véhicule WO2021243569A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/CN2020/093954 WO2021243569A1 (fr) 2020-06-02 2020-06-02 Module de rétroéclairage, dispositif d'affichage et véhicule
CN202080000883.XA CN114270250B (zh) 2020-06-02 2020-06-02 背光模组、显示装置以及交通工具
US17/036,444 US11300819B2 (en) 2019-12-20 2020-09-29 Curved surface display device having backlight assembly with frame members
US17/690,260 US11573441B2 (en) 2019-12-20 2022-03-09 Backlight assembly with frame having plurality of positioning grooves on rim

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/093954 WO2021243569A1 (fr) 2020-06-02 2020-06-02 Module de rétroéclairage, dispositif d'affichage et véhicule

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US17/036,444 Continuation-In-Part US11300819B2 (en) 2019-12-20 2020-09-29 Curved surface display device having backlight assembly with frame members

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CN106125397A (zh) * 2016-07-15 2016-11-16 友达光电（苏州）有限公司 背光模组及显示装置
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CN115951516A (zh) * 2022-12-08 2023-04-11 业成科技（成都）有限公司 背光模组及显示装置

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