CN111897161B - Display module and display device - Google Patents
Display module and display device Download PDFInfo
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- CN111897161B CN111897161B CN202010817868.6A CN202010817868A CN111897161B CN 111897161 B CN111897161 B CN 111897161B CN 202010817868 A CN202010817868 A CN 202010817868A CN 111897161 B CN111897161 B CN 111897161B
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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
- 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
- G02F1/133528—Polarisers
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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
Abstract
The invention provides a display module, comprising: the display liquid crystal display comprises a display liquid crystal panel, a dimming liquid crystal panel and a photoluminescence layer, wherein the display liquid crystal panel comprises a plurality of sub-pixels; the dimming liquid crystal panel comprises a plurality of dimming parts which are arranged corresponding to the sub-pixels one by one, and each dimming part is used for adjusting the transmittance of the first light which is incident to the photoluminescence layer through the dimming part; the photoluminescence layer sets up between dimming liquid crystal display panel and the demonstration liquid crystal display panel, and the photoluminescence layer includes a plurality of light-emitting portion that set up with a plurality of sub-pixel one-to-ones, and every light-emitting portion all includes: the light source comprises a first quantum dot layer and a second quantum dot layer, wherein the first quantum dot layer is arranged on one side, close to the dimming liquid crystal panel, of the second quantum dot layer, light emitted by quantum dots in the first quantum dot layer after being excited is of a first color, light emitted by quantum dots in the second quantum dot layer after being excited is of a second color, and the wavelength of the first color is larger than or equal to that of the second color. The invention also provides a display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display module and a display device.
Background
At present, a backlight source of a liquid crystal display device is usually configured with a blue Light Emitting Diode (LED) and phosphor, but due to the limitation of the Light Emitting spectrum of the phosphor, the display effect is not good enough. To solve the above problems, Quantum Dot materials (QDs) are used in the display field. The quantum dot material has good monodispersity, purer excitation spectrum and higher quantum efficiency, and the quantum dot material is applied to the backlight module as a fluorescent material, so that the color purity and the color saturation of display can be improved.
However, since the quantum dot material is easily affected by water/oxygen, the quantum dot material is usually protected by the barrier film, and the barrier film needs to have a certain thickness to achieve a good barrier effect, which is not favorable for the development of the display module toward light and thin.
Disclosure of Invention
The invention aims to at least solve one technical problem in the prior art and provides a display module and a display device.
In order to achieve the above object, the present invention provides a display module, which includes: the display liquid crystal display comprises a display liquid crystal panel, a dimming liquid crystal panel and a photoluminescence layer, wherein the display liquid crystal panel comprises a plurality of sub-pixels for displaying;
the dimming liquid crystal panel is arranged on the light incident side of the display liquid crystal panel and comprises a plurality of dimming parts which are arranged in one-to-one correspondence with the sub-pixels, and each dimming part is used for adjusting the transmittance of first light rays incident to the photoluminescence layer through the dimming part;
the photoluminescent layer is disposed between the dimming liquid crystal panel and the display liquid crystal panel, the photoluminescent layer includes a plurality of light-emitting portions disposed in one-to-one correspondence with the plurality of sub-pixels, and each of the light-emitting portions includes: the light source comprises a first quantum dot layer and a second quantum dot layer, wherein the first quantum dot layer is arranged on one side, close to the dimming liquid crystal panel, of the second quantum dot layer, light emitted by quantum dots in the first quantum dot layer after being excited by first light is of a first color, light emitted by quantum dots in the second quantum dot layer after being excited by the first light is of a second color, and the wavelength of the first color is larger than or equal to that of the second color.
Optionally, the quantum dots in the first quantum dot layer and the second quantum dot layer emit a plurality of light beams after being excited by the first light beam, and the photoluminescent layer further includes: and the first polaroid is arranged on one side, close to the display liquid crystal panel, of the second quantum dot layer.
Optionally, the polarization direction of the light emitted after the quantum dots in the first quantum dot layer are excited by the first light is a first direction, the polarization direction of the light emitted after the quantum dots in the second quantum dot layer are excited by the first light is a second direction, the first direction crosses the second direction, and the photoluminescent layer further includes: a polarization direction adjustment layer disposed between the first quantum dot layer and the second quantum dot layer, the polarization direction adjustment layer for adjusting polarized light polarized in the first direction to polarized light polarized in the second direction.
Optionally, the first color is red, the second color is green, and the color of the first light is blue.
Optionally, the light adjusting part includes a first liquid crystal layer, and the deflection angle ranges of liquid crystals in the first liquid crystal layer corresponding to different color sub-pixels are different.
Optionally, the first quantum dot layer and the second quantum dot layer are each doped with a bonding material.
Optionally, the dimming portion includes a first liquid crystal layer and a driving electrode disposed on at least one side of the first liquid crystal layer, the driving electrode is configured to apply an electric field to the first liquid crystal layer to deflect liquid crystals in the first liquid crystal layer, and the electric fields applied by the driving electrodes of different dimming portions are independent of each other.
Optionally, the display liquid crystal panel includes a first substrate and a color film substrate that are arranged oppositely, and a second liquid crystal layer located between the first substrate and the color film substrate;
the dimming liquid crystal panel further comprises a second substrate and a box aligning substrate which are oppositely arranged, and the first liquid crystal layer and the driving electrode are both positioned between the second substrate and the box aligning substrate;
the display module assembly still includes: the second polarizer is arranged on one side, far away from the first substrate, of the color film substrate, and the third polarizer is arranged on one side, far away from the box aligning substrate, of the second substrate.
The invention further provides a display device, which comprises a backlight module and the display module, wherein the backlight module is arranged on the light incident side of the display module, and the backlight module is used for providing the first light for the display module.
Optionally, the backlight module includes: the light-emitting device comprises a light-emitting device, a light guide plate, an optical film layer, a first reflector and a second reflector;
the light emitting device is arranged on the light incident surface side of the light guide plate, and the light emergent surface of the light guide plate faces the display module;
the optical film layer is arranged on the light emergent surface of the light guide plate;
the first reflector is arranged between the light emitting device and the display module, and the second reflector is arranged on one side, far away from the display module, of the light guide plate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1a is a schematic diagram of a conventional display device;
FIG. 1b is a schematic view of a conventional display device employing a dual cell structure;
fig. 2 is an exploded view of a display module according to an embodiment of the invention;
fig. 3a is a schematic structural diagram of a display module according to an embodiment of the present invention;
FIG. 3b is a second schematic structural diagram of a display module according to an embodiment of the present invention;
fig. 4 is a schematic diagram of dimming by the dimming portion according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a display device according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1a is a schematic view of a conventional display device, as shown in fig. 1a, the conventional display device includes a display panel 11 and a backlight module 12 located at a light incident side of the display panel 11, the backlight module 12 includes: the quantum dot layer 122 includes a quantum dot layer 121, a quantum dot layer 122, and two barrier films 123 disposed on two sides of the quantum dot layer 122, where the two barrier films 123 need to have a certain thickness to ensure a good water and oxygen blocking effect, so as to prevent the quantum dot layer 122 from being corroded by water and oxygen, and the barrier films 123 having a certain thickness are not favorable for the light and thin display device. Moreover, the edge portion D of the quantum dot layer 122 is difficult to be covered by the barrier film 123 (the left side of the quantum dot layer 122 in fig. 1 a), and the edge portion D of the quantum dot layer 122 is easy to fail after being eroded by water and oxygen, so that, in order to prevent the failed quantum dot layer 122 from affecting the display, the backlight module 12 needs to reserve a part of the area as a failed area, which leads to a reduction in the light emitting area of the backlight module 12, and further leads to a reduction in the display area AA of the display device, which is not favorable for the display device to realize a narrow frame.
Fig. 1b is a schematic view of a conventional display device using a dual liquid crystal CELL structure, and as shown in fig. 1b, the conventional display device using a dual liquid crystal CELL (BD CELL) structure includes: a display liquid crystal panel 13, a dimming liquid crystal panel 14, a backlight module 16, and a quantum dot layer 15 disposed between the display liquid crystal panel 13 and the dimming liquid crystal panel 14. Wherein the display panel 13 is used for displaying, and the dimming panel 14 is used for adjusting the brightness of the light incident on the display panel 13, compared to the display device shown in FIG. 1a, the quantum dot layer 15 of the display device in figure 1b is arranged between the display liquid crystal panel 13 and the dimming liquid crystal panel 14, instead of being disposed in the backlight module 16, the display device in fig. 1b uses the display liquid crystal panel 13 and the dimming liquid crystal panel 14 to realize water and oxygen barrier to the quantum dot layer 15, instead of the barrier film in fig. 1a, thereby facilitating the slimness and thinness of the display device, and, since the quantum dot layer 15 is disposed between the display liquid crystal panel 13 and the dimming liquid crystal panel 14, therefore, the light emitting area of the backlight module 16 and the area of the display area AA 'of the display device are not affected by the edge portion D' of the quantum dot layer 15, which is beneficial to the display device to realize a narrow frame.
The present quantum dot layer 15 usually adopts a mixed quantum dot material, which includes a green quantum dot material and a red quantum dot material, when light is incident on the quantum dot layer 15, the green quantum dot material and the red quantum dot material are excited at the same time, however, light emitted after the green quantum dot material is excited is also absorbed by the red quantum dot material, so that the brightness of red light and green light emitted from the quantum dot layer 15 is unstable, and the dimming capability of the dimming liquid crystal panel 14 is reduced.
In view of the above, an embodiment of the present invention provides a display module, and fig. 2 is an exploded view of the display module according to the embodiment of the present invention, as shown in fig. 2, the display module includes: a display liquid crystal panel 21, a dimming liquid crystal panel 22 and a photo-luminescent layer 23, wherein the display liquid crystal panel 21 comprises a plurality of sub-pixels P for displaying. The dimming lcd panel 22 is disposed on the light incident side of the display lcd panel 21, and the dimming lcd panel 22 includes dimming portions P ' disposed in one-to-one correspondence with the plurality of sub-pixels P, and the dimming portions P ' are used to adjust transmittance of the first light incident to the photoluminescent layer 23 through the dimming portions P '. The photoluminescent layer 23 is disposed between the dimming liquid crystal panel 22 and the display liquid crystal panel 21, the photoluminescent layer 23 includes a plurality of light-emitting portions a disposed in one-to-one correspondence with the plurality of sub-pixels P, and each of the light-emitting portions a includes: the light source module comprises a first quantum dot layer 231 and a second quantum dot layer 232, wherein the first quantum dot layer 231 is arranged on one side, close to the dimming liquid crystal panel 22, of the second quantum dot layer 232, light emitted by quantum dots in the first quantum dot layer 231 after being excited by first light is of a first color, light emitted by quantum dots in the second quantum dot layer 232 after being excited by the first light is of a second color, and the wavelength of the first color is larger than or equal to that of the second color.
In the embodiment of the present invention, the first light may refer to a backlight provided by a backlight module, a plurality of sub-pixels P in the display liquid crystal panel 21 may be arranged in an array, and both the light modulation portion P' and the light emitting portion a may be located right below the corresponding sub-pixel P. The plurality of light emitting portions a of the photoluminescent layer 23 may be formed as an entire layer structure, and the photoluminescent layer 23 may cover the entire light emitting surface of the dimming liquid crystal panel 22. The quantum dot materials of the first quantum dot layer 231 and the second quantum dot layer 232 may be determined according to actual needs, wherein the quantum dot materials may include silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots, indium arsenide quantum dots, and the like.
In the embodiment of the present invention, since the first quantum dot layer 231 is disposed on the side of the second quantum dot layer 232 close to the dimming liquid crystal panel 22, the first quantum dot layer 231 is excited by the first light in preference to the second quantum dot layer 232, and since the wavelength of the light (the first color) emitted by the quantum dots of the first quantum dot layer 231 after being excited is greater than or equal to the wavelength of the light (the second color) emitted by the quantum dots of the second quantum dot layer 232 after being excited, it is possible to avoid the light emitted by the quantum dots of the first quantum dot layer 231 after being excited being absorbed by the quantum dots of the second quantum dot layer 232, thereby preventing the problem of the dimming capability of the dimming liquid crystal panel 22 being reduced due to this.
As described below, in the process of dimming by the dimming portion P ' according to the embodiment of the present invention, when the transmittance of the dimming portion P ' is low, since the first quantum dot layer 231 is disposed on the side of the second quantum dot layer 232 close to the dimming liquid crystal panel 22, the first quantum dot layer 231 is excited by the first light in preference to the second quantum dot layer 232, and when the first light cannot pass through the first quantum dot layer 231, the light-emitting portion a emits the light of the first color (as shown in the left portion of fig. 2), since the wavelength of the light emitted by the quantum dots of the first quantum dot layer 231 after being excited is greater than or equal to the wavelength of the light emitted by the quantum dots of the second quantum dot layer 232 after being excited, the light emitted by the quantum dots of the first quantum dot layer 231 after being excited is not absorbed by the quantum dots of the second quantum dot layer 232, and at this time, the transmittance of the first light is appropriately adjusted by the dimming portion P ', the brightness of the light of the first color can be adjusted; when the transmittance of the first light passing through the light modulation part P 'is increased so that the first light can completely excite the quantum dots in the first quantum dot layer 231 and a part of the first light can pass through the first quantum dot layer 231 to excite the quantum dots in the second quantum dot layer 232, the light emitting part a emits the light of the first color and the light of the second color (as shown in the middle part of fig. 2), and at this time, the luminance of the light of the second color can be adjusted by properly adjusting the transmittance of the first light through the light modulation part P'; when the transmittance of the first light passing through the dimming portion P 'is further increased, so that the quantum dots in the first quantum dot layer 231 and the quantum dots in the second quantum dot layer 232 are all completely excited, and a part of the first light can pass through the second quantum dot layer 232, the light-emitting portion a emits the light of the first color, the light of the second color, and the first light (as shown in the right part of fig. 2), and at this time, the luminance of the first light passing through the second quantum dot layer 232 can be adjusted by appropriately adjusting the transmittance of the first light through the dimming portion P'.
In summary, with the display module according to the embodiment of the invention, the light-adjusting portion P 'controls the transmittance of the first light passing through the light-adjusting portion P', so that the color and brightness of the light emitted by the light-emitting portion a can be controlled, which is beneficial to improving the contrast of the display module.
Referring to fig. 2 to 4, a structure of a display module according to an embodiment of the present invention is described below, fig. 3a is a schematic diagram of a specific structure of the display module according to an embodiment of the present invention, and as shown in fig. 2 and 3a, in some specific embodiments, the dimming portion P 'includes a first liquid crystal layer 222 and a driving electrode (not shown in the figure) disposed on at least one side of the first liquid crystal layer 222, the driving electrode is configured to apply an electric field to the first liquid crystal layer 222, so that liquid crystals L in the first liquid crystal layer 222 are deflected, electric fields applied by driving electrodes of different dimming portions P' are independent from each other, where "electric fields are independent from each other" means that electric fields do not affect each other.
In the embodiment of the present invention, the first liquid crystal layer 222 in the plurality of dimming portions may be formed in an entire layer structure, the driving electrode may include a pixel electrode and a common electrode, and the pixel electrode and the common electrode may be respectively disposed at both sides of the first liquid crystal layer 222 or may be disposed at the same side of the first liquid crystal layer 222. The pixel electrodes of the plurality of light modulation parts P 'are insulated and spaced from each other, and the common electrode of the plurality of light modulation parts P' may be formed in an alignment layer structure.
In some embodiments, the display liquid crystal panel 21 includes a first substrate 213 and a color filter substrate 211 disposed opposite to each other, and a second liquid crystal layer 212 located between the first substrate 213 and the color filter substrate 211. The dimming lcd panel 22 further includes a second substrate 223 and a pair of cell substrates 221 disposed opposite to each other, and the first liquid crystal layer 222 and the driving electrode are disposed between the second substrate 223 and the pair of cell substrates 221. The display module assembly still includes: the second polarizer 26 is disposed on one side of the color filter substrate 211 away from the first substrate 213, and the third polarizer 27 is disposed on one side of the second substrate 223 away from the opposite-box substrate 221.
In some embodiments, the polarization direction of the light emitted after the quantum dots in the first quantum dot layer 231 and the second quantum dot layer 232 are excited by the first light is multiple, and the photoluminescent layer 23 further includes: the first polarizer 24 disposed on the side of the second quantum dot layer 232 close to the display liquid crystal panel 21.
In some embodiments, the first color is red, the second color is green, and the color of the first light is blue.
In the embodiment of the present invention, the first light (blue light) emitted from the backlight module is adjusted by the third polarizer 27 to become polarized light polarized along the third direction, and the first polarizer 24 is disposed on the second quantum dot layer 232 close to the display liquid crystal panel 21, so that the light emitted from the first quantum dot layer 231 and the second quantum dot layer 232 and the first light are both adjusted by the first polarizer 24 to be polarized along the fourth direction, wherein the third direction may be the same as the fourth direction or different from the fourth direction (e.g., perpendicular to each other).
Fig. 3b is a second specific structural diagram of the display module according to the second embodiment of the present invention, and as shown in fig. 2 and fig. 3b, in other embodiments, the polarization direction of the light emitted after the quantum dots in the first quantum dot layer 231 are excited by the first light is a first direction, the polarization direction of the light emitted after the quantum dots in the second quantum dot layer 232 are excited by the first light is a second direction, and the first direction and the second direction are crossed, or alternatively, the first direction and the second direction are perpendicular to each other. The photoluminescent layer 23 further comprises: a polarization direction adjustment layer 25 disposed between the first quantum dot layer 231 and the second quantum dot layer 232, the polarization direction adjustment layer 25 for adjusting polarized light polarized in the first direction to polarized light polarized in the second direction.
In the embodiment of the present invention, the backlight emitted from the backlight module is adjusted by the third polarizer 27 to become polarized light polarized along a third direction, wherein the third direction may be the same as the first direction.
In some embodiments, the dimming portion P 'includes a first liquid crystal layer 222, the range of the deflection angle of the liquid crystal L in the first liquid crystal layer 222 corresponding to the sub-pixels P of different colors is different, and the larger the deflection angle is, the higher the transmittance of the first light passing through the dimming portion P' is.
It should be noted that, in the embodiment of the present invention, the deflection angle range of the liquid crystal L in the first liquid crystal layer 222 refers to the deflection angle range that the liquid crystal L in the first liquid crystal layer 222 needs to reach under the control of the electric field applied by the driving electrodes, and does not refer to the deflection angle range that the liquid crystal L in the first liquid crystal layer 222 can actually reach, that is, in the embodiment of the present invention, the liquid crystal L in the first liquid crystal layer 222 can be deflected within a range of 0 ° to 90 ° under the driving of a sufficient electric field, but, because each light modulation part P 'corresponds to one sub-pixel P, during the actual display process, the liquid crystal L in the liquid crystal layer 222 in each light modulation part P' only needs to be deflected within a certain range, for example, fig. 4 is a schematic diagram of the light modulation part provided by the embodiment of the present invention, as shown in fig. 4, the first liquid crystal layer 222 corresponding to the red sub-pixel P (r) only needs to be deflected within a range of 0 ° to 30 °, the first liquid crystal layer 222 corresponding to the green sub-pixel p (g) only needs to deflect in the range of 30 ° to 60 °, and the first liquid crystal layer 222 corresponding to the blue sub-pixel p (b) only needs to deflect in the range of 60 ° to 90 °. Of course, the above angle ranges are only exemplary and are not intended to limit the angle ranges in the embodiments of the present invention.
In some embodiments, the lcd panel 21 includes red sub-pixels p (r), green sub-pixels p (g), and blue sub-pixels p (b). The deflection angle range of the liquid crystal L in the light control portion p (r) ' corresponding to the red subpixel p (r) is 0 ° to a °, the deflection angle range of the liquid crystal L in the light control portion p (g) ' corresponding to the green subpixel p (g) is a ° to b °, and the deflection angle range of the liquid crystal L in the light control portion p (b) ' corresponding to the blue subpixel p (b) is b ° to c °. Where a ° is a deflection angle of liquid crystal in the light control unit when the quantum dots in the first quantum dot layer 231 are completely excited by the first light emitted from the light control unit, b ° is a deflection angle of liquid crystal in the light control unit when both the quantum dots of the first quantum dot layer 231 and the quantum dots of the second quantum dot layer 232 are completely excited by the first light emitted from the light control unit, and c ° is a maximum deflection angle of liquid crystal in the light control unit.
Since the deflection angle of the liquid crystal L in the light adjusting portion p (r) ' is in the range of 0 ° to a °, the first light incident on the light emitting portion a (r) through the light adjusting portion p (r) ' can only excite the quantum dots in the first quantum dot layer 231, the quantum dots in the first quantum dot layer 231 emit red (first color) light after being excited by the first light, that is, the light emitting portion a (r) emits red light, and the greater the deflection angle of the liquid crystal L in the light adjusting portion p (r) ' is, the higher the luminance of the light emitting portion of red light emitted by the light emitting portion a (r) is. Since the liquid crystal L in the light adjusting portion P (g)' has a deflection angle ranging from a DEG to b DEG, therefore, the first light incident to the light emergent portion A (g) through the light adjusting portion P (g)' can completely excite the quantum dots in the first quantum dot layer 231, the first quantum dot layer 231 can also transmit a portion of the first light, the first light transmitted through the first quantum dot layer 231 can excite the quantum dots in the second quantum dot layer 232, after the quantum dots in the second quantum dot layer 232 are excited by the first light, emits green (second color) light, i.e., the light-emitting portions A (g) emit red light and green light, and the larger the deflection angle of the liquid crystal L in the light adjusting part P (g)' is, the higher the brightness of the green light emitted by the light emitting part A (g) is, at this time, since the quantum dots in the first quantum dot layer 231 are completely excited by the first light, the brightness of the red light emitted from the light emitting portion a (g) is not changed. Since the deflection angle of the liquid crystal L in the light adjusting portion p (b) ' is in the range of b ° to c °, the first light incident to the light emitting portion a (b) through the light adjusting portion p (b) ' can completely excite the quantum dots in the first quantum dot layer 231 and the quantum dots in the second quantum dot layer 232, and the second quantum dot layer 232 can also transmit a part of the first light, and the color of the first light is blue, that is, the light emitting portion a (b) emits red light, green light, and blue light, and the larger the deflection angle of the liquid crystal L in the light adjusting portion p (b) ' is, the higher the luminance of the blue light emitted by the light emitting portion a (b) is, and at this time, since the quantum dots in the first quantum dot layer 231 and the quantum dots in the second quantum dot layer 232 are completely excited by the first light, the luminance of the red light and the luminance of the green light emitted by the light emitting portion a (r) are not changed.
For example, when the deflection angle of the liquid crystal L in the light modulation part p (R) ' is a °, the deflection angle of the liquid crystal L in the light modulation part p (G) ' is b °, and the deflection angle of the liquid crystal L in the light modulation part p (b) ' is c °, the quantum dots of the first quantum dot layer 231 in the light emission part a (R) are completely excited by the first light, the light emission part a (R) emits red light, the brightness of the red light is R, the quantum dots of the first quantum dot layer 231 and the quantum dots of the second quantum dot layer 232 in the light emission part a (G) are completely excited by the first light, the brightness of the green light is G, the quantum dots of the first quantum dot layer 231 and the quantum dots of the second quantum dot layer 232 in the light emission part a (b) are completely excited by the first light, and a part of the first quantum dot layer 232 is transmitted, the light emitting portion A (B) emits red light, green light and blue light, and the brightness of the blue light at this time is B. When the deflection angle of the liquid crystal L in the light adjusting part p (R) ' is a/2 °, the deflection angle of the liquid crystal L in the light adjusting part p (G) ' is (b + a)/2 °, and the deflection angle of the liquid crystal L in the light adjusting part p (b) ' is (c + b)/2 °, half of the quantum dots of the first quantum dot layer 231 in the light emitting part a (R) are excited by the first light, the light emitting part a (R) emits red light at which the luminance of the red light is R/2, the quantum dots of the first quantum dot layer 231 in the light emitting part a (G) are completely excited by the first light, half of the quantum dots of the second quantum dot layer 232 are excited by the first light, the light emitting part a (G) emits green light at which the luminance of the green light is G/2, and the quantum dots of the first quantum dot layer 231 and the quantum dots of the second quantum dot layer 232 in the light emitting part a (b) are completely excited by the first light, the second quantum dot layer 232 has a portion of the first light penetrating therethrough, and the light-emitting portion a (B) emits red light, green light, and blue light, wherein the brightness of the blue light is B/2.
In summary, with the display module according to the embodiment of the present invention, the color and the brightness of the light emitted by each light-emitting portion a can be controlled by adjusting the transmittance of the first light through the dimming lcd panel 22, compared to the scheme shown in fig. 1b, the dimming capability of the dimming lcd panel 22 of the display module according to the embodiment of the present invention is not affected, and the display of the display module has a higher contrast ratio.
In some embodiments, the first quantum dot layer 231 and the second quantum dot layer 232 are doped with a mixture, and the mixture includes a bonding material (e.g., UV glue), a polymer, and the like. The first quantum dot layer 231 and the second quantum dot layer 232 doped with the adhesive material can bond the dimming liquid crystal panel 22 and the display liquid crystal panel 21 together, so that the first quantum dot layer 231 and the second quantum dot layer 232 can replace the original optical adhesive, and the thickness of the display module is further reduced.
The display device includes a backlight module and the display module 2, the display module 2 includes a display liquid crystal panel 21, a dimming liquid crystal panel 22, and a photoluminescent layer 23 disposed between the display liquid crystal panel 21 and the dimming liquid crystal panel 22, the backlight module is disposed on a light incident side of the display module 2, and the backlight module is configured to provide a first light to the display module 2.
With the display device according to the embodiment of the present invention, it is possible to prevent light emitted from the quantum dots of the first quantum dot layer after being excited from being absorbed by the quantum dots of the second quantum dot layer, thereby preventing a problem of a decrease in dimming capability of the dimming liquid crystal panel 22 caused by the light.
In some embodiments, the backlight module may be a side-entry backlight module, the backlight module comprising: a light emitting device 31, a light guide plate 32, an optical film layer 33, a first reflector 34, and a second reflector 35. The optical film 33 includes a brightness enhancement film, a diffusion film, etc., the light emitting device 31 is disposed on the light incident surface side of the light guide plate 32, and the light emitting surface of the light guide plate 32 faces the display module 2. The optical film layer 33 is disposed on the light emitting surface of the light guide plate 32. The first reflector 34 is disposed between the light emitting device 31 and the display module 2, and the second reflector 35 is disposed on a side of the light guide plate 32 away from the display module 2.
In some embodiments, the backlight module further comprises: the backlight module comprises a back plate 36 and a driving circuit 37, wherein the driving circuit 37 is arranged on the back plate 36, the light emitting device 31 is connected with the driving circuit 37, and the driving circuit 37 is used for driving the light emitting device 31 to emit light.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A display module, comprising: the liquid crystal display comprises a display liquid crystal panel, a dimming liquid crystal panel and a photoluminescence layer, wherein the display liquid crystal panel comprises a plurality of sub-pixels for displaying;
the dimming liquid crystal panel is arranged on the light incidence side of the display liquid crystal panel and comprises a plurality of dimming parts which are arranged in one-to-one correspondence with the plurality of sub-pixels, and each dimming part is used for adjusting the transmittance of first light rays which enter the photoluminescent layer through the dimming part; the light adjusting part comprises a first liquid crystal layer, and the deflection angle ranges of liquid crystals in the first liquid crystal layer corresponding to different color sub-pixels are different;
the photoluminescent layer is disposed between the dimming liquid crystal panel and the display liquid crystal panel, the photoluminescent layer includes a plurality of light-emitting portions disposed in one-to-one correspondence with the plurality of sub-pixels, and each of the light-emitting portions includes: the light source comprises a first quantum dot layer and a second quantum dot layer, wherein the first quantum dot layer is arranged on one side, close to the dimming liquid crystal panel, of the second quantum dot layer, light emitted by quantum dots in the first quantum dot layer after being excited by the first light is of a first color, light emitted by quantum dots in the second quantum dot layer after being excited by the first light is of a second color, and the wavelength of the first color is larger than or equal to that of the second color.
2. The display module of claim 1, wherein the quantum dots in the first quantum dot layer and the second quantum dot layer emit a plurality of light beams having a plurality of polarization directions after being excited by the first light beam, and the photoluminescent layer further comprises: and the first polarizer is arranged on one side, close to the display liquid crystal panel, of the second quantum dot layer.
3. The display module of claim 1, wherein the polarization direction of the light emitted from the quantum dots in the first quantum dot layer after being excited by the first light is a first direction, the polarization direction of the light emitted from the quantum dots in the second quantum dot layer after being excited by the first light is a second direction, and the first direction crosses the second direction, wherein the photoluminescent layer further comprises: a polarization direction adjustment layer disposed between the first quantum dot layer and the second quantum dot layer, the polarization direction adjustment layer being configured to adjust polarized light polarized in the first direction to polarized light polarized in the second direction.
4. The display module according to any one of claims 1 to 3, wherein the first color is red, the second color is green, and the color of the first light is blue.
5. The display module according to any one of claims 1 to 3, wherein the first quantum dot layer and the second quantum dot layer are doped with an adhesive material.
6. A display module according to any one of claims 1 to 3, wherein the dimming part comprises a first liquid crystal layer and a driving electrode disposed on at least one side of the first liquid crystal layer, the driving electrode is configured to apply an electric field to the first liquid crystal layer to deflect liquid crystal in the first liquid crystal layer, and the electric fields applied by the driving electrodes of different dimming parts are independent of each other.
7. The display module according to claim 6, wherein the display liquid crystal panel comprises a first substrate and a color filter substrate which are arranged oppositely, and a second liquid crystal layer located between the first substrate and the color filter substrate;
the dimming liquid crystal panel further comprises a second substrate and a box aligning substrate which are oppositely arranged, and the first liquid crystal layer and the driving electrode are located between the second substrate and the box aligning substrate;
the display module assembly still includes: the second polarizer is arranged on one side, far away from the first substrate, of the color film substrate, and the third polarizer is arranged on one side, far away from the box aligning substrate, of the second substrate.
8. A display device, comprising a backlight module and the display module as claimed in any one of claims 1 to 7, wherein the backlight module is disposed at a light incident side of the display module, and the backlight module is configured to provide the first light for the display module.
9. The display device according to claim 8, wherein the backlight module comprises: the light-emitting device comprises a light-emitting device, a light guide plate, an optical film layer, a first reflector and a second reflector;
the light-emitting device is arranged on the light incident surface side of the light guide plate, and the light emergent surface of the light guide plate faces the display module;
the optical film layer is arranged on the light emergent surface of the light guide plate;
the first reflector is arranged between the light-emitting device and the display module, and the second reflector is arranged on one side, far away from the display module, of the light guide plate.
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