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CN105278163A - Direct illumination type backlight module and display device with same - Google Patents

Direct illumination type backlight module and display device with same Download PDF

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Publication number
CN105278163A
CN105278163A CN201510783798.6A CN201510783798A CN105278163A CN 105278163 A CN105278163 A CN 105278163A CN 201510783798 A CN201510783798 A CN 201510783798A CN 105278163 A CN105278163 A CN 105278163A
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CN
China
Prior art keywords
reflecting part
fixed part
light source
reflecting
display panel
Prior art date
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Granted
Application number
CN201510783798.6A
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Chinese (zh)
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CN105278163B (en
Inventor
樊勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to CN201510783798.6A priority Critical patent/CN105278163B/en
Publication of CN105278163A publication Critical patent/CN105278163A/en
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133605Direct backlight including specially adapted reflectors
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs

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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)
  • Liquid Crystal (AREA)

Abstract

The invention provides a direct illumination type backlight module which comprises the components of a backboard, a reflective sheet arranged on the backboard, and light sources at the back surface of the backboard. The reflective sheet comprises the components of a first fixed part which is arranged between the back surface of the backboard and the light sources; a first reflecting part which at least extends from one side of the first fixed part; and a second reflecting part which extends from one end that is far from the first fixed part on the first reflecting part to the first reflecting part. The reflective sheet in the backlight module provided by the invention is arranged in a double-folded-edge design manner, and can improve frame blackening or corner dark spots on the edge of a liquid crystal display device. Compared with a manner of printing a gray or black ink on the oblique side of the reflective sheet, the direct illumination type backlight module has advantages of saving printing process and reducing cost. Furthermore the reflective sheet is also provided with cutting wires and roulettes, thereby preventing wrinkle or partial degumming projection on the reflective sheet.

Description

A kind of down straight aphototropism mode set and display device
Technical field
The present invention relates to display technique field, particularly relate to a kind of down straight aphototropism mode set and display device.
Background technology
Backlight module is one of key part and component of liquid crystal display, and because liquid crystal itself is not luminous, namely the function of backlight module is well-off brightness and the light source be evenly distributed, can normal show image.At present, two kinds of conventional backlight modules are down straight aphototropism mode set and side-light backlight module, the essential distinction of two kinds of backlight modules is the position of light emitting source, in down straight aphototropism mode set, light emitting source is positioned at immediately below display panel, and in side-light backlight module, light emitting source is positioned at backlight side.Along with the increase of display size, down straight aphototropism mode set obtains to be applied widely.
Down straight aphototropism mode set comprises backboard, reflector plate and light source, and light source is positioned at backboard bottom surface.In down straight aphototropism mode set, because lamp box height is thicker, usually increase hypotenuse design being positioned at backboard bottom reflection sheet edge, improving the apparent thickness of back plate edges.But this single hypotenuse design can make reflector plate hypotenuse and angled portion reflection ray incide on display panel, make the phenomenons such as display panel marginal existence entirety is partially dark, blackout, brightness disproportionation, thus occur the phenomenon of black surround or corner blackening at display panel edge.Black surround or corner blackening phenomenon is solved mainly by printing grey or black ink on reflector plate hypotenuse in prior art, but, adopt the method that the brightness of reflector plate angled portion can not be made to increase, only weaken the brightness of hypotenuse part.And this way can not the brightness of fundamentally compensatory reflex sheet angled portion, and owing to have employed reflector plate printing process, the cost of reflector plate is caused to increase.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention proposes a kind of backlight module and the display device that can improve directly-down liquid crystal display edge and occur the phenomenon of black surround or corner blackening.
The technical scheme that the present invention proposes is: a kind of down straight aphototropism mode set, and comprise to the backboard of lower and upper setting, reflector plate, light source and display panel, described reflector plate comprises:
First fixed part that arrange corresponding to described light source;
Described first fixed part one side bending also extends to form the first reflecting part towards described display panel direction, and the angle of described first reflecting part and described first fixed part is α, described α≤90 °; The length of described first reflecting part is a, and described light source height is B, and the relation of described first reflecting part and described light source meets asin α≤B;
Described first reflecting part end bending also extends to form the second reflecting part towards described display panel edge direction; Described second reflecting part and its be β at the projection angle of surface level, described β≤90 °.
Further, described reflector plate also comprises from described second reflecting part end bending and the second fixed part extended towards described display panel edge direction, and described second reflecting part is connected with described display panel by described second fixed part;
Wherein, the distance that project to described first fixed part side of described second fixed part end in the plane at described first fixed part place is h; Distance between the projection of described second fixed part end in the plane at described first fixed part place and described light source is H; H/10≤h≤9H/10.
Further, described first reflecting part is provided with at least one the first cutting lines, and described first reflecting part is vertical with described first cutting line with the boundary line of described second reflecting part.
Further, described second reflecting part is provided with at least one the second cutting lines, and described first reflecting part is vertical with described second cutting line with the boundary line of described second reflecting part, described first cutting line and described second cutting line coplanar.
Further, described light source comprises some groups of light emitting diode matrixs.
Further, described first fixed part corresponds to described in two adjacent groups and is provided with roulette between light emitting diode matrix.
The present invention also provides a kind of display device, comprises down straight aphototropism mode set, and described down straight aphototropism mode set comprises to the backboard of lower and upper setting, reflector plate, light source and display panel, and described reflector plate comprises:
First fixed part that arrange corresponding to described light source;
Described first fixed part one side bending also extends to form the first reflecting part towards described display panel direction, and the angle of described first reflecting part and described first fixed part is α, described α≤90 °; The length of described first reflecting part is a, and described light source height is B, and the relation of described first reflecting part and described light source meets asin α≤B;
Described first reflecting part end bending also extends to form the second reflecting part towards described display panel edge direction; Described second reflecting part and its be β at the projection angle of surface level, described β≤90 °.
Further, described reflector plate also comprises from described second reflecting part end bending and the second fixed part extended towards described display panel edge direction, and described second reflecting part is connected with described display panel by described second fixed part;
Wherein, the distance that project to described first fixed part side of described second fixed part end in the plane at described first fixed part place is h; Distance between the projection of described second fixed part end in the plane at described first fixed part place and described light source is H; H/10≤h≤9H/10.
Further, described first reflecting part is provided with at least one the first cutting lines, and described first reflecting part is vertical with described first cutting line with the boundary line of described second reflecting part;
Described second reflecting part is provided with at least one the second cutting lines, and described first reflecting part is vertical with described second cutting line with the boundary line of described second reflecting part, described first cutting line and described second cutting line coplanar.
Further, described light source comprises some groups of light emitting diode matrixs; Described first fixed part corresponds to described in two adjacent groups and is provided with roulette between light emitting diode matrix.
In backlight module provided by the invention, reflector plate adopts double-fold design, the phenomenon that black surround or corner blackening appear in directly-down liquid crystal display edge can be improved, compared to traditional mode of printing grey or black ink on reflector plate hypotenuse, save printing process, reduce cost.In addition, described reflector plate is also provided with cutting line and roulette, avoids reflector plate and produce fold or the phenomenon arched upward of locally coming unstuck.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, by the specific embodiment of the present invention describe in detail, will make technical scheme of the present invention and other beneficial effect apparent.
Fig. 1 is back light module unit structure schematic diagram of the prior art;
Fig. 2 is embodiment 1 display device structure cut-open view;
Fig. 3 is embodiment 1 reflector plate structure schematic diagram;
Fig. 4 is embodiment 2 display device structure cut-open view;
Fig. 5 is embodiment 2 reflector plate structure schematic diagram.
Fig. 6 is the light schematic diagram of embodiment 2.
Embodiment
Below, embodiments of the invention are described in detail with reference to the accompanying drawings.But, the present invention can be implemented in many different forms, and the present invention should not be interpreted as being limited to the specific embodiment of setting forth here.On the contrary, provide these embodiments to be to explain principle of the present invention and practical application thereof, thus enable others skilled in the art understand various embodiment of the present invention and be suitable for the various amendments of certain expected application.In the accompanying drawings, identical label will be used to indicate identical element all the time.
With reference to Fig. 1, in prior art, described down straight aphototropism mode set comprises backboard 01, light source 02, sheet emitting 03.Described reflector plate 03 comprises the first fixed part 031 between described backboard bottom surface and described light source 02, the reflecting part 032 that described first fixed part 031 edge is bent to form, the second fixed part 033 that described reflecting part 032 bends towards its horizontal projection direction.As can be seen from the figure, described reflector plate 03 is fixed on backboard by be clamped in by described first fixed part 031 between described backboard 01 and described light source 02 and to be clamped between described display panel 04 and described backboard 01 by described second fixed part 033.When the light that described light source 02 sends projects on described reflecting part 032, described reflecting part 032 reflects it on display panel 04, so form the black surround district as shown in frame empty in Fig. 1 on said display panel.
Backlight module provided by the invention, its reflector plate adopts double-fold design, can improve the phenomenon that black surround or corner blackening appear in directly-down liquid crystal display screen edge.Technical scheme of the present invention is described in detail below by specific embodiment.
Embodiment 1
With reference to Fig. 2, present embodiments provide a kind of display device, comprise such as, a kind of backlight module 1 of straight-down negative, described backlight module 1 comprises backboard 11, reflector plate 12, light source 13, display panel 2.Described reflector plate 12 is positioned on described backboard 11, and described light source is positioned on described backboard bottom surface 11a, corresponding with the viewing area 2a of display panel 2.In the present embodiment, described light source 13 is arranged by multi-group light-emitting diode array spacings to form, and every bar light emitting diode row are provided with a predetermined number light emitting diode.
Described reflector plate 12 comprises: the first fixed part 12a, the first reflecting part 12b, the second reflecting part 12c and the second fixed part 12d.
First fixed part 12a is between described backboard bottom surface 11a and described light source 13; Described first fixed part 12a corresponds to the viewing area of described display panel 2, and it has two sides that can extend in left and right.
Bend from the arbitrary side of described first fixed part 12a (or two side ends simultaneously) and extend to form the first reflecting part 12b towards described display panel direction; Described first reflecting part 12b and described first fixed part 12a shape have angle as α.
From described first reflecting part 12b end, extend to form the second reflecting part 12c away from described first fixed part 12a direction.Described second reflecting part and its be β at the projection angle of surface level.
From described second reflector plate 12c away from described first reflecting part one end along away from described first fixed part 12a direction extend the second fixed part 12d, described second fixed part 12d is parallel with described first fixed part 12a.
Wherein, the angle between described second reflecting part 12c and described first reflecting part 12b be greater than described first reflecting part 12b and its horizontal direction project between angle; Preferred described angle α is less than 90 °, angle β is less than 90 °.The part light that this structure can make described light source send projects after on described first reflecting part 12b and can not be reflected on described viewing area 2a, thus can not occur the phenomenon of black surround or corner blackening at described display screen edge.In real process, between described first reflecting part 12b with described first fixed part 12a, the setting of angle α is also relevant with the glossiness of described first reflecting part, concrete, described first reflecting part 12b projected length is in the vertical direction longer, and namely described angle α is larger, then the glossiness of described first reflecting part is lower, such as, described first reflecting part 12b projected length is in the vertical direction 5mm, then the glossiness of described first reflecting part is less than 30.
Further, in order to optimize beneficial effect, setting the distance that project to described first fixed part side of described second fixed part end in the plane at described first fixed part place is h; Distance between the projection of described second fixed part end in the plane at described first fixed part place and described light source is H; H/10≤h≤9H/10; Can ensure that the light of light source side leakage can be reflected back on the first fixed part 12a by the first reflecting part completely by improving, and viewing area can not be arrived; And when guaranteeing to watch in display panel 2 dead ahead, the sidewall of described backboard and bottom surface there will not be in the visual field, meet the requirement of display device to frivolous size.
Further, described reflector plate 12 can adopt a monoblock reflector plate to bend out described first fixed part 12a, the first reflecting part 12b, the second reflecting part 12c, the second fixed part 12d respectively, also can be to be spliced by the first fixed part 12a be separated from each other, the first reflecting part 12b, the second reflecting part 12c, the second fixed part 12d.
Generally, in order to save cost, what described reflector plate 12 adopted is a monoblock reflector plate, arch upward in order to avoid reflector plate produces fold or locally comes unstuck, some (being such as two) cutting lines are provided with at described first reflecting part 12b and/or the second reflecting part 12c, such as, described first reflecting part 12b, the first cutting line 12e of the second reflecting part 12c, the second cutting line 12e is separately positioned on.There is a boundary line between described first reflecting part and described second reflecting part, described cutting line is vertical with described boundary line, and described first cutting line and described second cutting line are coplanar.
In order to save material and fixing described reflector plate, the structure of described backboard is identical with described reflector plate structure, as shown in Figure 2, be corresponding in turn to comprise the bottom surface 11a fitted with described first fixed part 12a, the first side wall 11b fitted with described first reflecting part 12b, the second sidewall 11c of fitting with described second reflecting part 12c, the rest portion 11d fitted with described second fixed part 12d and the fixed part 11e upwards extended by described rest portion 11d.Described fixed part 11e is used for carrying out spacing to described display panel 2; Described rest portion 11d is used for shelving described second fixed part 12d and described display panel 2 and is compressed by described second fixed part 12d together with described display panel 2; Described bottom surface 11a is used for shelving described first fixed part 12a and described light source and is compressed by described first fixed part 12a together with described light source, and described like this reflector plate 12 just can be fixed on described backboard 11.Preferably, tightr in order to make described reflector plate 12 and described backboard 11 fit, by double faced adhesive tape, described reflector plate 12 can be pasted with described backboard 11.
In addition, because described light source 13 produces heat in luminescence process, the temperature of described reflector plate 12 can along with rising, like this, described reflector plate 12 shrinks and causes the angle between described first reflecting part 12b and described first fixed part 12a to reduce, when described angle is less than 90 °, then described first reflecting part 12b and the second reflecting part 12c can be caused the part light that described light source 13 sends to be reflexed to the phenomenon described viewing area 2a occurring black surround or corner blackening at described display panel 2 edge.In order to avoid described reflector plate 12 shrinks, between the light emitting diode matrix adjacent row of described first fixed part 12a corresponding to described light source 13, be provided with roulette 12f, change excessive to alleviate because reflector plate shrinks the angle between the first reflecting part 12b and described first fixed part 12a of stating caused.In the present embodiment, three roulette 12f are set respectively between horizontal and longitudinal light emitting diode arranges.
Embodiment 2
With reference to shown in Fig. 4 and Fig. 5, embodiment 2 difference from Example 1 is that the structure of described first reflecting part 12b and described second reflecting part 12c is different, and the structure of corresponding backboard is also different.
In example 2, the angle α between described first reflecting part 12b and described first fixed part 12a, as 90 ° of < α <135 °; In order to the light making light source reflex on described first reflecting part 12b can not arrive viewing area, the second reflecting part 12c in the present embodiment, is utilized to be reflected by the light on the first reflecting part 12b.Reach foregoing invention object, the certain relation of demand fulfillment between the second reflecting part and the first reflecting part.
As shown in Figure 6, as 90 ° of < α <135 °; Suppose that the light of light source is always incident on described first reflecting part in the horizontal direction, the light after the first reflecting part reflection reaches display panel.If wish the ray trapping reflexed on display panel or reflect, then the second reflecting part is needed to need to reach this light reflection place.Suppose that the first reflecting part length is l, described display panel is H to the distance of described first fixed part, by calculating the angle between known second reflecting part and display panel:
θ=arctan(a/b);
The then length of the second reflecting part:
L = a 2 + b 2 ;
Wherein, a=H-lsin α, b=H/tan2 α-lcos α;
That is, as 90 ° of < α <135 °, the angle demand fulfillment θ≤arctan (a/b) between the second reflecting part and display panel, and time, can the object of the invention be reached equally.By such setting, the part light sent when described light source projects after on described first reflecting part 12b and the second reflecting part 12c and can not be reflected on described viewing area 2a, thus can not occur the phenomenon of black surround or corner blackening at described display screen edge.
The above is only the embodiment of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.

Claims (10)

1. a down straight aphototropism mode set, comprise to the backboard of lower and upper setting, reflector plate, light source and display panel, it is characterized in that, described reflector plate comprises:
First fixed part that arrange corresponding to described light source;
Described first fixed part one side bending also extends to form the first reflecting part towards described display panel direction, and the angle of described first reflecting part and described first fixed part is α, described α≤90 °; The length of described first reflecting part is a, and described light source height is B, and the relation of described first reflecting part and described light source meets asin α≤B;
Described first reflecting part end bending also extends to form the second reflecting part towards described display panel edge direction; Described second reflecting part and its be β at the projection angle of surface level, described β≤90 °.
2. backlight module according to claim 1, it is characterized in that, described reflector plate also comprises from described second reflecting part end bending and the second fixed part extended towards described display panel edge direction, and described second reflecting part is connected with described display panel by described second fixed part;
Wherein, the distance that project to described first fixed part side of described second fixed part end in the plane at described first fixed part place is h; Distance between the projection of described second fixed part end in the plane at described first fixed part place and described light source is H; H/10≤h≤9H/10.
3. backlight module according to claim 1 and 2, is characterized in that, described first reflecting part is provided with at least one the first cutting lines, and described first reflecting part is vertical with described first cutting line with the boundary line of described second reflecting part.
4. backlight module according to claim 1 and 2, it is characterized in that, described second reflecting part is provided with at least one the second cutting lines, and described first reflecting part is vertical with described second cutting line with the boundary line of described second reflecting part, described first cutting line and described second cutting line coplanar.
5. backlight module according to claim 1 and 2, is characterized in that, described light source comprises some groups of light emitting diode matrixs.
6. backlight module according to claim 5, is characterized in that, described first fixed part corresponds to described in two adjacent groups and is provided with roulette between light emitting diode matrix.
7. a display device, comprises down straight aphototropism mode set, and described down straight aphototropism mode set comprises to the backboard of lower and upper setting, reflector plate, light source and display panel, and it is characterized in that, described reflector plate comprises:
First fixed part that arrange corresponding to described light source;
Described first fixed part one side bending also extends to form the first reflecting part towards described display panel direction, and the angle of described first reflecting part and described first fixed part is α, described α≤90 °; The length of described first reflecting part is a, and described light source height is B, and the relation of described first reflecting part and described light source meets asin α≤B;
Described first reflecting part end bending also extends to form the second reflecting part towards described display panel edge direction; Described second reflecting part and its be β at the projection angle of surface level, described β≤90 °.
8. display device according to claim 7, it is characterized in that, described reflector plate also comprises from described second reflecting part end bending and the second fixed part extended towards described display panel edge direction, and described second reflecting part is connected with described display panel by described second fixed part;
Wherein, the distance that project to described first fixed part side of described second fixed part end in the plane at described first fixed part place is h; Distance between the projection of described second fixed part end in the plane at described first fixed part place and described light source is H; H/10≤h≤9H/10.
9. the display device according to claim 7 or 8, is characterized in that, described first reflecting part is provided with at least one the first cutting lines, and described first reflecting part is vertical with described first cutting line with the boundary line of described second reflecting part;
Described second reflecting part is provided with at least one the second cutting lines, and described first reflecting part is vertical with described second cutting line with the boundary line of described second reflecting part, described first cutting line and described second cutting line coplanar.
10. the display device according to claim 7 or 8, is characterized in that, described light source comprises some groups of light emitting diode matrixs;
Described first fixed part corresponds to described in two adjacent groups and is provided with roulette between light emitting diode matrix.
CN201510783798.6A 2015-11-16 2015-11-16 A kind of down straight aphototropism mode set and display device Active CN105278163B (en)

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CN110082952A (en) * 2016-10-27 2019-08-02 船井电机株式会社 Display device
CN114740659A (en) * 2022-05-26 2022-07-12 业成科技(成都)有限公司 Backlight module, backlight module manufacturing method, head-up display and vehicle
CN115016167A (en) * 2021-12-01 2022-09-06 荣耀终端有限公司 Backlight module and display device
CN115220258A (en) * 2021-04-16 2022-10-21 Oppo广东移动通信有限公司 Backlight panel, backlight module and display device
US11841581B2 (en) 2021-01-13 2023-12-12 K-Tronics (Suzhou) Technology Co., Ltd. Reflective sheet and manufacturing method thereof, backlight module, and display device

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CN110082952A (en) * 2016-10-27 2019-08-02 船井电机株式会社 Display device
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CN108761902B (en) * 2018-03-13 2022-03-22 友达光电股份有限公司 Backlight Module with Reflector
US11841581B2 (en) 2021-01-13 2023-12-12 K-Tronics (Suzhou) Technology Co., Ltd. Reflective sheet and manufacturing method thereof, backlight module, and display device
CN115220258A (en) * 2021-04-16 2022-10-21 Oppo广东移动通信有限公司 Backlight panel, backlight module and display device
CN115220258B (en) * 2021-04-16 2024-04-23 Oppo广东移动通信有限公司 Backlight plate, backlight module and display device
CN115016167A (en) * 2021-12-01 2022-09-06 荣耀终端有限公司 Backlight module and display device
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