CN108153055B - Backlight module and liquid crystal display - Google Patents
Backlight module and liquid crystal display Download PDFInfo
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- CN108153055B CN108153055B CN201810016500.2A CN201810016500A CN108153055B CN 108153055 B CN108153055 B CN 108153055B CN 201810016500 A CN201810016500 A CN 201810016500A CN 108153055 B CN108153055 B CN 108153055B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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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
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Abstract
The invention provides a backlight module and a liquid crystal display device, wherein the liquid crystal panel emits light by depending on the backlight module, the liquid crystal panel comprises an upper polaroid, an upper substrate, a lower substrate and a lower polaroid which are sequentially arranged from top to bottom, the backlight module comprises a light guide plate, a reflecting plate and a light source which are sequentially arranged from top to bottom, the backlight module further comprises an electroluminescent sheet, the electroluminescent sheet is arranged between the lower substrate and the light guide plate, the electroluminescent sheet is used for emitting light together with the light source when wide color gamut display is realized, and the light source is used for emitting light when common color gamut display is realized.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display.
Background
The liquid crystal display has the advantages of thinness, light weight, low power consumption, no radiation pollution and the like, and is widely applied to the current display equipment. The liquid crystal display generally includes liquid crystal faceplate and back light module set, the liquid crystal faceplate does not illuminate, need to rely on the back light module set to illuminate, the back light module set is divided into direct type and side light type according to the light source distribution position, the direct type back light module set is to dispose the light source behind the liquid crystal faceplate evenly, make the light source convey the whole screen evenly; the side-light type backlight module is characterized in that light emitting sources are uniformly distributed on the periphery of a liquid crystal panel, and a light guide plate is matched with the light emitting sources, so that when the light emitting sources emit light, the light emitted from the edge of a screen is transmitted to the whole screen through the light guide plate.
The most commonly used light source of the side-light type backlight module is L ED (L light Emitting Diode) backlight, L ED comprises a wide color gamut L ED and a white light L ED, the wide color gamut L ED can meet the requirements of consumers in multimedia projection, game entertainment and the like, the energy consumption is high, and the white light L ED can meet the requirements of consumers in character reading and the like, and the energy consumption is low.
In the prior art, to implement color gamut switching, white light L ED and wide color gamut L ED are generally arranged in a staggered manner to form L ED light bars, all white light L ED is controlled to be turned off and all wide color gamuts L ED are controlled to be turned on when wide color gamut display is required, all wide color gamuts L ED are controlled to be turned off and all white light L ED is controlled to be turned on when general color gamut display is required, fig. 1 is a partial cross-sectional view of a liquid crystal display in the prior art, and fig. 2 is a distribution diagram of light sources in fig. 1. referring to fig. 1 and fig. 2, the liquid crystal display includes a liquid crystal panel 10 and a backlight module 20, the liquid crystal panel 10 includes an upper polarizer 11, an upper substrate 12, a lower substrate 13 and a lower polarizer 14 from top to bottom, the backlight module 20 includes an upper diffuser 21, an upper prism sheet 22, a lower prism sheet 23, a lower diffuser sheet 24, a light guide plate 25 and a reflective sheet 26 from top to bottom, a light source 51 is arranged on one side of the light guide plate 25.
However, the design has the following problems that 1, when the screen penetration rate is low, L ED particles must be added to meet the brightness requirement, because two L ED particles are positioned on the same plane, and under the condition of a certain total length, the influence on the beating gap and heat dissipation is caused by too many L ED particles, 2, when L ED particles are few, when white light L ED or wide color gamut L ED is independently lightened, the problem of local hot spots is caused by the fact that the gap between L ED particles is enlarged, so that the light guide plate is heated unevenly, and 3, when the color gamut of the liquid crystal display is switched, the arrangement of L ED particles cannot be shared by the light guide plate.
Disclosure of Invention
The invention aims to provide a backlight module to solve the problems that a local hot spot exists in the backlight module capable of realizing color gamut switching in the prior art and a light guide plate cannot be shared during color gamut switching.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a backlight module, a liquid crystal panel emits light by depending on the backlight module, the liquid crystal panel comprises an upper polaroid, an upper substrate, a lower substrate and a lower polaroid which are sequentially arranged from top to bottom, the backlight module comprises a light guide plate, a reflecting plate and a light source which are sequentially arranged from top to bottom, the backlight module also comprises an electroluminescent sheet, and the electroluminescent sheet is arranged between the lower substrate and the light guide plate; the electroluminescent sheet is used for emitting light together with the light source when wide color gamut display is realized, and the light source is used for emitting light when common color gamut display is realized.
Furthermore, the backlight module also comprises an upper prism sheet, a lower prism sheet and a diffusion sheet which are arranged between the lower polarizer and the light guide plate in a stacking way from top to bottom, and the electroluminescent sheet is positioned between the lower polarizer and the upper prism sheet.
Furthermore, the backlight module also comprises a diffusion sheet, an upper prism sheet and a lower prism sheet which are arranged between the lower polarizer and the light guide plate in a stacking manner from top to bottom, and the electroluminescent sheet is positioned between the lower prism sheet and the light guide plate.
Furthermore, the backlight module also comprises an upper diffusion sheet, an upper prism sheet, a lower prism sheet and a lower diffusion sheet which are arranged between the lower polarizer and the light guide plate in a laminated mode, and the electroluminescent sheet is located between the lower substrate and the lower polarizer.
Furthermore, the electroluminescent sheet comprises a substrate layer, and a protective layer, a first conductive layer, an insulating layer, a light-emitting layer and a second conductive layer are sequentially arranged on the substrate layer.
Further, the first conductive layer is an anode layer, and the second conductive layer is a cathode layer.
Further, the first conductive layer is a cathode layer, and the second conductive layer is an anode layer.
Further, the first conducting layer is made of a metal conducting material, the second conducting layer is made of a transparent conducting material, and the substrate layer is made of one of glass, polyethylene terephthalate and polycarbonate.
Further, the first conductive layer and the second conductive layer are both made of transparent conductive materials.
The invention also provides a liquid crystal display which comprises the backlight module.
The invention provides a backlight module and a liquid crystal display, wherein the backlight module comprises an electroluminescent sheet, a light guide plate, a reflecting plate and a light source, the light guide plate is arranged between the electroluminescent sheet and the reflecting plate, and the light source is positioned at the side direction of the light guide plate; when the common color gamut display is needed, the light source emits light alone.
Drawings
Fig. 1 is a partial cross-sectional view of a prior art lcd.
Fig. 2 is a schematic distribution diagram of the light source in fig. 1.
FIG. 3 is a schematic partial cross-sectional view of a liquid crystal display according to a first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of the electroluminescent sheet of fig. 3.
Fig. 5 is a schematic diagram of spectrum traces corresponding to each color gamut of the liquid crystal display of fig. 1 and 3.
FIG. 6 is a partial cross-sectional view of a second embodiment of a liquid crystal display according to the present invention.
FIG. 7 is a partial cross-sectional view of a liquid crystal display according to a third embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
FIG. 3 is a partial cross-sectional view of a liquid crystal display according to a first embodiment of the invention. Referring to fig. 3, the liquid crystal display provided by the present embodiment includes a liquid crystal panel 30 and a backlight module 40, and the liquid crystal panel 30 emits light by the backlight module 40. The liquid crystal panel 30 includes an upper polarizer 31, an upper substrate 32, a lower substrate 33, and a lower polarizer 34, which are stacked in this order from top to bottom. The backlight module 40 includes an upper prism sheet 42, a lower prism sheet 43, a diffusion sheet 44, a light guide plate 45, and a reflection sheet 46, which are sequentially disposed from top to bottom, and the backlight module 40 further includes an electroluminescent sheet 41. In this embodiment, the light source 47 is of an edge type, and in other embodiments, the light source 47 may be of a direct type. Specifically, the light source 47 may be a white light emitting diode as light emitted from the light emitter.
Wherein the light guide plate 45 is disposed between the electro-luminescence sheet 41 and the reflection plate 46, and the electro-luminescence sheet 41 is disposed under the lower substrate 33. In the first embodiment of the present invention, the electroluminescent sheet 41 is disposed below the lower polarizer 34, and in particular, the electroluminescent sheet 41 is located between the lower polarizer 34 and the upper prism sheet 42. The electroluminescent sheet 41 is used to emit light in conjunction with the light source 47 when wide color gamut display is realized; the light source 47 is used to emit light alone when ordinary color gamut display is realized. In this embodiment, the electroluminescent sheet 41 in the backlight module 40 replaces the original upper diffusion sheet, so that the color gamut switching of the liquid crystal display can be realized without changing the thickness of the backlight module 40.
Fig. 4 is a schematic structural diagram of the electroluminescent sheet 41 in fig. 3. Referring to fig. 4, the electroluminescent sheet 41 includes a base layer 410, and a first conductive layer 412, an insulating layer 413, a light-emitting layer 414 and a second conductive layer 415 are sequentially disposed on the base layer 410. Specifically, the first conductive layer 412 is deposited on the base layer 410, the insulating layer 413 is disposed on the first conductive layer 412, the light emitting layer 414 is disposed on the insulating layer 413, and the second conductive layer 415 is disposed on the light emitting layer 414. The insulating layer 413 is, for example, an insulating ink of barium titanate (BaTiO)3) And a resin binder; the light-emitting layer 414 is, for example, a light-emitting ink which is a zinc sulfide (ZnS) emitter doped with a fluorescent dye such as Cu or Mg; the material of the base layer 410 of the electroluminescent sheet 41 is preferably one of glass, polyethylene terephthalate, and polycarbonate. In this embodiment, the base layer 410 is a film made of polyethylene terephthalate, and the first conductive layer 412, the insulating layer 413, the light-emitting layer 414, and the second conductive layer 415 are formed on the film in this order.
Further, a protective layer 411 is disposed between the base layer 410 and the first conductive layer 412, and a surface of the second conductive layer 415 away from the insulating layer 413 is also provided with the protective layer 411. The protective layer 411 is, for example, ink containing magnesium silicate and a resin binder.
Referring to fig. 4, in the present embodiment, the first conductive layer 412 is an anode layer of the electroluminescent sheet 41 and the second conductive layer 415 is a cathode layer of the electroluminescent sheet 41. The anode layer is an electrode layer made of a conductive material, and the conductive material may be a metal conductive material or a transparent conductive material, and specifically, when the anode layer is a metal conductive material, the anode layer is a metal conductive film with a small thickness so that light can pass through the metal conductive film, and the metal conductive film includes at least one of aluminum, gold, silver, chromium, nickel, titanium, and molybdenum. The cathode layer is an electrode layer made of a conductive material, such as at least one of indium tin oxide and indium zinc oxide, or a metal conductive film with a small thickness so that light can penetrate through the metal conductive film, wherein the metal conductive film comprises at least one of aluminum, gold, silver, chromium, nickel, titanium and molybdenum.
In other embodiments, the first conductive layer 412 can be a cathode layer of the electroluminescent sheet 41 and the second conductive layer 415 can be an anode layer of the electroluminescent sheet 41.
Specifically, when the electroluminescent sheet 41 is operated, an ac voltage is applied to the first electrode layer 412 and the second electrode layer 415 respectively, so as to form an electric field between the first electrode layer 412 and the second electrode layer 415, the electric field causes zinc sulfide (ZnS) particles in the light-emitting layer 414 to generate excitation type transition, so as to emit light in each charge-discharge cycle, and when the light-emitting layer 414 contains different activators, light with different colors can be emitted. And the emitted brightness can be different along with the change of the voltage magnitude and the frequency between the two electrode layers. In this embodiment, the electroluminescent sheet 41 emits red light, but the present invention is not limited thereto, and in other embodiments, the electroluminescent sheet 41 may emit blue light or green light.
When the liquid crystal display needs to realize wide color gamut display, an alternating voltage can be applied to the electroluminescent sheet 41 to enable the electroluminescent sheet 41 to emit red light, and the light source 47 is controlled to emit light at the same time, that is, the electroluminescent sheet 41 and the light source 47 emit light at the same time; when the liquid crystal display needs to realize a general color gamut display, the electroluminescent sheet 41 does not emit light and the light source 47 emits light alone without applying an ac voltage to the electroluminescent sheet 41.
Fig. 5 is a schematic diagram of spectral loci corresponding to color gamuts of the liquid crystal display of fig. 1 and 3, please refer to fig. 5, where a spectral locus ① is a color gamut of 100% NTSC (National Television standards committee, usa) in CIE1931 color space, a spectral locus ② is a color gamut of the liquid crystal display of fig. 1, where the NTSC color gamut is 79.78%, i.e., a normal color gamut, a spectral locus ③ is an NTSC color gamut of the liquid crystal display of fig. 3, where the color gamut is NTSC 84.54%, i.e., a wide color gamut, a spectral locus ② and a spectral locus ③ are obtained by experiments, and a red light spectral coordinate a1, a green light spectral coordinate B1, a blue light spectral coordinate C1 and a white light spectral coordinate D1 of the spectral locus ②, and a red light spectral coordinate a1, a green light spectral coordinate B1, a blue light spectral coordinate C1 and a white light spectral coordinate D1 of the spectral locus ③ are specifically listed in table:
| spectral locus ② | X axis coordinate | Y-axis coordinate |
| A1 | 0.658 | 0.335 |
| B1 | 0.318 | 0.635 |
| C1 | 0.154 | 0.038 |
| D1 | 0.338 | 0.316 |
| Spectral locus ③ | X axis coordinate | Y-axis coordinate |
| a1 | 0.679 | 0.320 |
| b1 | 0.318 | 0.635 |
| c1 | 0.154 | 0.038 |
| d1 | 0.277 | 0.311 |
FIG. 6 is a partial cross-sectional view of a second embodiment of a liquid crystal display according to the present invention. Referring to fig. 6, the present embodiment is different from the first embodiment in that an el sheet 41 is disposed between a lower prism sheet 43 and a light guide plate 45. The present embodiment further includes other components, and refer to the first embodiment specifically.
FIG. 7 is a partial cross-sectional view of a liquid crystal display according to a third embodiment of the present invention. Referring to fig. 7, the difference between the present embodiment and the two embodiments is that the electroluminescent sheet 41 is disposed between the lower substrate 33 and the lower polarizer 34. Specifically, in the present embodiment, the backlight module 40 further includes an upper diffusion sheet 44a and a lower diffusion sheet 44b, and an upper prism sheet 42 and a lower prism sheet 43 are disposed between the upper diffusion sheet 44a and the lower diffusion sheet 44 b. The present embodiment further includes other components, and refer to the first embodiment specifically. In other embodiments, the number of the diffusion sheets of the backlight module 40 may be only one.
The backlight module 40 and the liquid crystal display provided by the invention, the backlight module 40 comprises an electroluminescent sheet 41, a light guide plate 45, a reflecting sheet 46 and a light source 47, wherein the light guide plate 45 is arranged between the electroluminescent sheet 41 and the reflecting sheet 46, the electroluminescent sheet 41 parallel to the light guide plate 45 is arranged in the backlight module 40, when the liquid crystal display needs to realize wide color gamut display, the electroluminescent sheet 41 and the light source 47 emit light together, when the common color gamut display needs to be realized, the light source 47 emits light alone, so that NTSC color gamut switching is realized on the premise of not needing to arrange mixed L ED, and the positions of all parts of the liquid crystal display do not need to be adjusted.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A backlight module (40), the liquid crystal faceplate (30) relies on the said backlight module (40) to give out light, the said liquid crystal faceplate (30) includes from last to last polaroid (31), upper base plate (32), hypocoxa (33) and lower polaroid (34) that set up sequentially down, the said backlight module (40) includes from last to last light guiding plate (45), reflecting plate (46) and light source (47) that set up sequentially down, characterized by, the said backlight module (40) also includes the electroluminescent sheet (41), the said electroluminescent sheet (41) is set up between said hypocoxa (33) and said light guiding plate (45); the electroluminescent sheet (41) is used for emitting light together with the light source (47) when wide color gamut display is realized; when the common color gamut display is realized, the electroluminescent sheet (41) does not emit light, and the light source (47) emits light alone.
2. The backlight module (40) of claim 1, wherein the backlight module (40) further comprises an upper prism sheet (42), a lower prism sheet (43), and a diffusion sheet (44) which are stacked from top to bottom between the lower polarizer (34) and the light guide plate (45), and the electroluminescent sheet (41) is located between the lower polarizer (34) and the upper prism sheet (42).
3. The backlight module (40) of claim 1, wherein the backlight module (40) further comprises a diffusion sheet (44), an upper prism sheet (42) and a lower prism sheet (43) which are stacked from top to bottom between the lower polarizer (34) and the light guide plate (45), and the electroluminescent sheet (41) is located between the lower prism sheet (43) and the light guide plate (45).
4. The backlight module (40) of claim 1, wherein the backlight module (40) further comprises an upper diffusion sheet (44a), an upper prism sheet (42), a lower prism sheet (43), and a lower diffusion sheet (44b) which are stacked between the lower polarizer (34) and the light guide plate (45), and the electroluminescent sheet (41) is positioned between the lower substrate (33) and the lower polarizer (34).
5. The backlight module (40) of claim 1, wherein the electroluminescent sheet (41) comprises a base layer (410), and a protective layer (411), a first conductive layer (412), an insulating layer (413), a light-emitting layer (414), and a second conductive layer (415) are sequentially disposed on the base layer (410).
6. The backlight module (40) of claim 5, wherein the first conductive layer (412) is an anode layer and the second conductive layer (415) is a cathode layer.
7. The backlight module (40) of claim 5, wherein the first conductive layer (412) is a cathode layer and the second conductive layer (415) is an anode layer.
8. The backlight module (40) as claimed in claim 5, wherein the first conductive layer (412) is a metal conductive material, the second conductive layer (415) is a transparent conductive material, and the substrate layer (410) is any one of glass, polyethylene terephthalate and polycarbonate.
9. The backlight module (40) as set forth in claim 5 wherein the first conductive layer (412) and the second conductive layer (415) are both a transparent conductive material.
10. A liquid crystal display comprising a backlight module (40) according to any of claims 1-9.
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| CN201810016500.2A CN108153055B (en) | 2018-01-08 | 2018-01-08 | Backlight module and liquid crystal display |
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| CN201810016500.2A CN108153055B (en) | 2018-01-08 | 2018-01-08 | Backlight module and liquid crystal display |
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| CN109387899B (en) * | 2018-10-22 | 2020-09-25 | 东莞市银泰丰光学科技有限公司 | Light guide assembly without dark corners and processing method thereof |
| CN116643429A (en) * | 2023-05-25 | 2023-08-25 | 绵阳惠科光电科技有限公司 | Light guide plate assembly and backlight module |
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| JP2004118133A (en) * | 2002-09-30 | 2004-04-15 | Telecommunication Advancement Organization Of Japan | Image display device |
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