CN112445023A - Backlight module, display equipment and control method thereof - Google Patents
Backlight module, display equipment and control method thereof Download PDFInfo
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- CN112445023A CN112445023A CN201910813428.0A CN201910813428A CN112445023A CN 112445023 A CN112445023 A CN 112445023A CN 201910813428 A CN201910813428 A CN 201910813428A CN 112445023 A CN112445023 A CN 112445023A
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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
- G02F1/133603—Direct backlight with LEDs
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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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
-
- 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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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Abstract
The invention discloses a backlight module, display equipment and a control method of the backlight module. The light control subareas can be driven and controlled independently, so that corresponding areas on the PDLC light adjusting film are changed into transparent areas, other areas are non-transparent areas, light rays in the light emitting areas of the lighted LED chips can be reflected to the display screen to be displayed by the transparent PDL light adjusting film, and other light rays are absorbed or scattered by the non-transparent PDLC light adjusting film, so that the purpose of eliminating halos on the periphery of the light emitting areas is achieved.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a backlight module, display equipment and a control method of the backlight module.
Background
The TFT-LCD (thin film transistor liquid crystal display) is one of the most liquid crystal displays, and the dark state of the TFT-LCD cannot be absolutely turned off, so the static contrast ratio has a technical bottleneck (the upper limit of the static contrast ratio is generally less than or equal to 6000:1) compared with the OLED, and the contrast ratio of 10000:1 to 400000:1 required by HDR cannot be achieved. At present, a Local dimming technical means exists on TFT-LCD display equipment to reduce dark state light leakage and improve contrast, such display equipment is mostly a direct type backlight, and the structure of the display equipment is shown in fig. 1, which is a plurality of LED chips 100, optical films 200 and TFT-LCD display screens 300 that are tiled according to an array and arranged at intervals from bottom to top; the working principle is shown in fig. 2, the backlight LED is controlled by regions according to the screen display signals, the low-gray-scale region corresponding to the screen display is reduced, and even the LED corresponding to the region is closed, so that the dark-state brightness can be reduced, and the contrast ratio is more than 10000: 1.
The resolution of the current display device is 4K (3840 × 2160), 8K (7680 × 4320), but the local light control partition is about tens to ten thousand, which causes the problem of halo appearing at the periphery of the display area on the display screen; as shown in fig. 3, the ideal display effect is that the LEDs corresponding to the rest of the area except the bright point 400 are in the off state, but due to the reflection inside the backlight, the actual display is often as shown in fig. 4 and 5, and there is reflected light around the bright point 400 and thus a halo 500 is formed. The halo 500 is caused as shown in fig. 5, and light emitted from the turned-on LEDs 101 and 102 is emitted from the periphery of the bright point by repeated reflection, thereby reducing the display effect of local dimming.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The present invention provides a backlight module, a display device and a control method thereof, aiming at solving the problem of halo appearing at the periphery of the image display area of the existing display screen.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the utility model provides a backlight module, wherein, backlight module includes the backplate, sets up PDLC membrane of adjusting luminance on the backplate and sets up a plurality of LED chips on the PDLC membrane of adjusting luminance, a plurality of LED chips divide into a plurality of light-emitting areas of respectively independent control, PDLC membrane of adjusting luminance includes a plurality of accuse light subregion, every light-emitting area at least corresponds one accuse light subregion.
The backlight module, wherein, PDLC membrane of adjusting luminance includes upper substrate, infrabasal plate, sets up the upper substrate with polymer dispersed liquid crystal layer between the infrabasal plate and setting are in the infrabasal plate is kept away from the reflector layer of polymer dispersed liquid crystal layer one side.
The backlight module, wherein, the upper substrate orientation polymer dispersed liquid crystal layer one side is provided with the upper electrode, the infrabasal plate orientation polymer dispersed liquid crystal layer one side is provided with a plurality of bottom electrode, a plurality of bottom electrode can be separately controlled, each accuse light subregion all includes one at least the bottom electrode.
The backlight module is characterized in that one side of the lower substrate, which faces the polymer dispersed liquid crystal layer, is also provided with a plurality of leads, and each lower electrode corresponds to one lead and is electrically connected with an IC bus through the lead.
The backlight module is characterized in that one side of the lower substrate, which faces the polymer dispersed liquid crystal layer, is also provided with a plurality of TFTs (thin film transistors), a plurality of source lines and a plurality of gate lines, each lower electrode corresponds to one TFT, the plurality of lower electrodes are arranged in an array, and all the lower electrodes in each row correspond to one gate line and are respectively and electrically connected with the corresponding gate line through the TFTs; all the lower electrodes in each column correspond to a source line and are electrically connected with the corresponding source line through the TFT respectively; the plurality of gate lines are connected in parallel to the gate driving IC, and the plurality of source lines are connected in parallel to the source driving IC.
The backlight module is characterized in that the upper electrode covers the polymer dispersed liquid crystal layer.
The backlight module is characterized in that the upper electrode comprises a plurality of driving electrodes which can be respectively and independently controlled, and the driving electrodes are in one-to-one correspondence with the lower electrodes.
A display device comprises the backlight module, and further comprises a display screen and an optical diaphragm, wherein the display screen and the optical diaphragm are arranged on one side, away from the PDLC dimming film, of the LED chips, and the optical diaphragm is located between the display screen and the LED chips.
A control method of a display apparatus, comprising:
acquiring the position and the width L2 of an image display area on a display screen;
calculating the number of light control partitions needing to be started according to L2;
and opening the light control subareas corresponding to the positions and the number of the image display areas.
The control method, wherein the calculating the number of light control partitions needing to be started according to L2 includes:
calculating L1 according to L2 and the preset corresponding relation between L2 and the whole width L1 of the lower electrode needing to be driven;
acquiring the width of a single lower electrode, and calculating the number of lower electrodes needing to be driven according to L1;
and calculating the number of the light control subareas needing to be started according to the number of the lower electrodes needing to be driven and the number of the lower electrodes contained in each light control subarea.
Has the advantages that: in the invention, after an image display area on the display screen is determined, the position of an LED chip corresponding to the image display area is determined, a light control partition corresponding to the LED chip is opened, and light control partitions at other positions are kept in a closed state; the started light control subarea can reflect light rays emitted by the light emitting area, the light rays are emitted to the display screen for display after being reflected, and the light rays outside the light emitting area are absorbed or scattered by the PDLC light modulation film and cannot be reflected to the display screen, so that the reflected light is eliminated on the periphery of the corresponding light emitting area on the display screen, and the purpose of eliminating halation on the display screen when the LED chip is lightened is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a display device in the prior art;
FIG. 2 is a schematic diagram of a prior art display screen displaying in different areas;
FIG. 3 is a schematic diagram showing a display state of the display panel without halo;
FIG. 4 is a schematic view showing a display state of a display screen with halo;
FIG. 5 is a schematic diagram of the distribution of light within a display device when there is halo in the prior art;
FIG. 6 is a schematic view of the structure of the display device according to the present invention;
FIG. 7 is a schematic structural view of the PDLC light modulation film according to the present invention when the polymer dispersed liquid crystal layer is in a transparent state;
FIG. 8 is a schematic structural view of the PDLC light modulation film according to the present invention when the polymer dispersed liquid crystal layer is in a non-transparent state;
FIG. 9 is a schematic diagram of an upper electrode and a lower electrode layout according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of the distribution structure of the upper electrode and the lower electrode in the second embodiment of the present invention;
FIG. 11 is a schematic diagram of the distribution structure of the upper electrode and the lower electrode in the third embodiment of the present invention;
FIG. 12 is a schematic diagram of an arrangement of upper electrodes and lower electrodes according to a fourth embodiment of the present invention;
FIG. 13 is a schematic diagram of an upper electrode and a lower electrode layout according to a fifth embodiment of the present invention;
FIG. 14 is a schematic diagram of an upper electrode and a lower electrode layout according to a sixth embodiment of the present invention;
fig. 15 is a flowchart of a control method of the display apparatus according to the present invention;
fig. 16 is a functional block diagram of a display device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention, a backlight module, a display device and a control method thereof are described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a backlight module, which is applied to display equipment with a display screen and an optical diaphragm; as shown in fig. 6, the backlight module includes a back plate 10, a PDLC dimming film 4 disposed on the back plate 10, and a plurality of LED chips 3 disposed on the PDLC dimming film 4, where the plurality of LED chips 3 are divided into a plurality of light emitting areas which are individually controlled, respectively, and the PDLC dimming film 4 includes a plurality of light control partitions, and each light emitting area corresponds to at least one light control partition; when the light control subareas are started, the light control subareas reflect light rays emitted by the light emitting areas corresponding to the light control subareas; when the light control subareas are closed, the light control subareas cannot reflect light rays emitted by the light emitting areas corresponding to the light control subareas.
Specifically, after an image display area on the display screen is determined, the position of an LED chip corresponding to the image display area is determined, a light control partition corresponding to the position of the LED chip is opened, and light control partitions at other positions are kept in a closed state; the started light control subarea can reflect light rays emitted by the light emitting area, the light rays are emitted to the display screen for display after being reflected, and the light rays outside the light emitting area are absorbed or scattered by the PDLC light modulation film and cannot be reflected to the display screen, so that the reflected light is eliminated on the periphery of the corresponding light emitting area on the display screen, and the purpose of eliminating halation on the display screen when the LED chip is lightened is achieved.
As shown in fig. 7 and 8, the PDLC dimming film 4 includes an upper substrate 41, a polymer dispersed liquid crystal layer 43, a lower substrate 45, and a reflective layer 46; the polymer dispersed liquid crystal layer 43 is located between the upper substrate 41 and the lower substrate 45, and the reflective layer 46 is located on the side of the lower substrate away from the polymer dispersed liquid crystal layer; the PDLC light modulation film 4 is used for adjusting a light passing state, when the PDLC light modulation film 4 is powered off, as shown in fig. 8, the polymer liquid crystal material in the polymer dispersed liquid crystal layer is randomly arranged, so that light cannot penetrate through the polymer dispersed liquid crystal layer, at this time, the PDLC light modulation film 4 is in a milky opaque state, and can absorb or scatter light incident to the upper substrate 41, and light cannot be reflected upwards from the surface of the upper substrate 41. When the PDLC light modulation film 4 is powered on, under the action of an electric field, as shown in fig. 7, the polymer liquid crystal material in the polymer dispersed liquid crystal layer is orderly arranged, so that light can penetrate through the polymer dispersed liquid crystal layer, and at this time, the PDLC light modulation film 4 is in a transparent and colorless film state.
Further, an upper electrode 42 is further disposed on a side of the upper substrate 41 facing the polymer dispersed liquid crystal layer 43, and a plurality of lower electrodes 44 are further disposed on a side of the lower substrate 45 facing the polymer dispersed liquid crystal layer 43; the plurality of lower electrodes 44 are arranged in a display manner, and the plurality of lower electrodes 44 are connected in parallel, so that the plurality of lower electrodes 44 can be respectively and independently controlled; each of the light-controlling sections includes at least one of the lower electrodes 44.
The lower electrodes 44 are connected in parallel to a signal source, so that the signal source can individually control each of the lower electrodes 44, when the signal source provides a control signal to the upper electrode 42 and the lower electrode in a certain light-controlling partition to drive the light-controlling partition, the polymer dispersed liquid crystal layer corresponding to the light-controlling partition (i.e., the polymer dispersed liquid crystal layer between the driven lower electrode and the upper electrode 42) is in a transparent state for light to pass through, and the polymer dispersed liquid crystal layers corresponding to other light-controlling partitions (i.e., the polymer dispersed liquid crystal layer between the undriven lower electrode and the upper electrode 42) are still in a non-transparent state to absorb or scatter light.
The plurality of lower electrodes 44 are arranged in an array above the lower substrate 45, so as to control the PDLC dimming film in different areas, in the present invention, the light control areas need to be matched with the light emitting areas of the LED chips 3, specifically, the number of rows and columns of the array composed of the plurality of LED chips 3 needs to be respectively equal to the number of rows and columns of the array arranged by the plurality of lower electrodes 44, and the number of the lower electrodes 44 is greater than or equal to the number of the LED chips 3, in a preferred embodiment, at least one lower electrode 44 corresponds to the lower part of each LED chip 3.
In the first preferred embodiment of the present invention, only one lower electrode 44 is disposed under each LED chip 3, and the number of the lower electrodes 44 is equal to the number of the LED chips 3. In the second preferred embodiment of the present invention, two or more lower electrodes 44 are disposed below each LED chip 3, and the number of the lower electrodes 44 is greater than the number of the LED chips 3, so that the partitions of the lower conductive layer 44 are finer, the size of each lower electrode 44 is smaller, the gap between two adjacent lower electrodes 44 in each row is smaller, and even the gap can be ignored, thereby avoiding the inconsistency between the state of the liquid crystal layer corresponding to the gap between two adjacent lower electrodes 44 and the state of the polymer dispersed liquid crystal layer between the two lower electrodes 44 and the upper electrode 42, and ensuring the consistency of the light passing performance.
As shown in fig. 6, the reflective layer 46 is disposed on the upper surface of the back plate 10, and the reflective layer 46 overlaps the lower surface of the lower substrate 45 and completely covers the lower surface of the lower substrate 45, so that light passing through the PDLC dimming film 4 from any position toward the reflective layer 46 can be reflected by the reflective layer 46, pass through the lower substrate 45, the polymer dispersed liquid crystal layer 43 and the upper substrate 41, and be emitted toward the optical film 2, and finally be displayed on the display screen 1.
When a certain LED chip 3 is lighted, the corresponding light control subarea below the LED chip 3 is started, so that the polymer dispersed liquid crystal layer corresponding to the light control subarea is in a transparent state, the area of the polymer dispersed liquid crystal layer 43 which does not correspond to the light control subarea is in a non-transparent state, the light emitted from the LED chip 3 to the optical diaphragm 2 is reflected to the upper substrate 41 by the optical diaphragm 2, the light in the light emitting area of the LED chip 3 can be emitted to the reflecting layer 46 through the transparent liquid crystal layer, is reflected by the reflecting layer 46 and then is emitted to the display screen 1 for displaying, the light outside the light emitting area of the LED chip 3 is absorbed or scattered by the non-transparent liquid crystal layer and cannot be reflected to the display screen 1, so that the reflected light is eliminated on the display screen 1 corresponding to the periphery of the light emitting area of the LED chip 3, and the periphery of the display screen 1 corresponding to the light emitting area of the LED chip 3 is kept in a dark state, the purpose of eliminating the halation on the display screen 1 when the LED chip 3 is lightened is achieved.
The lower electrode 44 is driven in the present invention by the following two ways but not limited to: in a first preferred embodiment of the present invention, a plurality of conducting wires 442 are further disposed on one side of the lower substrate 45 facing the polymer dispersed liquid crystal layer 43, each of the lower electrodes 44 corresponds to one conducting wire 442, the signal source includes an IC bus 5, and each of the lower electrodes 44 is electrically connected to the IC bus 5 through one conducting wire 442, so that the plurality of lower electrodes 44 are connected in parallel on the IC bus 5, and the IC bus 5 can independently control the driving and closing of any one of the lower electrodes 44.
In the second preferred embodiment of the present invention, a plurality of TFTs 8, a plurality of source lines 6 and a plurality of gate lines 7 are further disposed on the side of the lower substrate 45 facing the polymer dispersed liquid crystal layer 43, and the plurality of TFTs 8 and the plurality of lower electrodes 44 are in one-to-one correspondence and electrically connected, that is, each of the lower electrodes 44 is electrically connected to one TFT 8; the number of the gate lines 7 is equal to the number of rows of the array of the lower electrodes 44, and all the lower electrodes 44 in each row correspond to one gate line 7 and are electrically connected to the gate lines 7 through corresponding TFTs, respectively; the number of the source lines 6 is equal to the number of columns of the array of the lower electrodes 44, and all the lower electrodes 44 in each column correspond to one source line 6 and are electrically connected with the source lines 6 through corresponding TFTs respectively; the signal source comprises a gate drive IC71 and a source drive IC61, the gate lines 7 are connected in parallel to the gate drive IC71, and the source lines 6 are connected in parallel to the source drive IC61, so that the gate drive IC71 and the source drive IC61 can simultaneously control the drive of any lower electrode 44, and further, the independent control of any light control partition is realized.
Further, the structure of the upper electrode 42 includes the following two types: in a first preferred embodiment of the present invention, the upper electrode 42 is electrically connected to the signal source, the upper electrode 42 covers the upper surface of the polymer dispersed liquid crystal layer 43, that is, the upper electrode 42 is a full-surface electrode, and the signal source includes the IC bus 422.
In a second preferred embodiment of the present invention, the upper electrode 42 includes a plurality of driving electrodes 426 arranged in an array, and the plurality of driving electrodes 426 are connected to the signal source in parallel; each of the driving electrodes 426 corresponds to one of the lower electrodes 44.
According to the structure of the upper electrode 42 and the lower electrode 44, the PDLC light modulation film 4 can be configured by the following embodiments in the present invention:
example one
As shown in fig. 9, the upper electrode 42 is a full-surface electrode, and the first electrode 421 is connected to the IC bus 422; the lower substrate 45 is provided with a plurality of TFTs 8, a plurality of source lines 6 and a plurality of gate lines 7 on a side facing the polymer dispersed liquid crystal layer 43, the plurality of TFTs 8 correspond to and are electrically connected to the plurality of lower electrodes 44 one by one, the number of the gate lines 7 is equal to the number of rows of the array of the lower electrodes 44, and the lower electrodes 44 in each row are electrically connected to the gate lines 7 through the TFTs 8; the number of the source lines 6 is equal to the number of columns of the array of the lower electrodes 44, and the lower electrodes 44 in each column are electrically connected to the source lines 6 through the corresponding TFTs 8; the signal source includes a gate driver IC71 and a source driver IC61, the plurality of gate lines 7 are connected in parallel to the gate driver IC71, and the plurality of source lines 6 are connected in parallel to the source driver IC 61.
Example two
As shown in fig. 10, the upper electrode 42 is a full-surface electrode, and the upper electrode 42 is connected to the IC bus 422; the lower substrate 45 is provided with a plurality of wires 442 facing the polymer dispersed liquid crystal layer 43, the plurality of wires 442 are in one-to-one correspondence with the plurality of lower electrodes 44, and the lower electrodes 44 are electrically connected to the IC bus 5 through the wires 442.
EXAMPLE III
As shown in fig. 11, the upper electrode 42 includes a plurality of driving electrodes 426 arranged in an array, the plurality of driving electrodes 426 are individually controllable, at least one driving electrode 426 corresponds to the lower portion of each LED chip 3, and the driving electrodes 426 correspond to the lower electrodes 44 one by one up and down; the plurality of driving electrodes 426 are connected in parallel to the IC bus 422. The lower substrate 45 is provided with a plurality of TFTs 8, a plurality of source lines 6 and a plurality of gate lines 7 on a side facing the polymer dispersed liquid crystal layer 43, the plurality of TFTs 8 correspond to and are electrically connected to the plurality of lower electrodes 44 one by one, the number of the gate lines 7 is equal to the number of rows of the array of the lower electrodes 44, and the lower electrodes 44 in each row are electrically connected to the gate lines 7 through the TFTs 8; the number of the source lines 6 is equal to the number of columns of the array of the lower electrodes 44, and the lower electrodes 44 in each column are electrically connected to the source lines 6 through the TFTs 8; the signal source includes a gate driver IC71 and a source driver IC61, the plurality of gate lines 7 are connected in parallel to the gate driver IC71, and the plurality of source lines 6 are connected in parallel to the source driver IC 61.
Example four
As shown in fig. 12, the upper electrode 42 includes a plurality of driving electrodes 426, a plurality of TFTs 425, a plurality of source lines 423, and a plurality of gate lines 424 are further disposed on a side of the upper substrate 41 facing the polymer dispersed liquid crystal layer 43, the plurality of TFTs 425 correspond to the plurality of driving electrodes 426 one by one and are electrically connected, the plurality of driving electrodes 426 are arranged in an array, at least one driving electrode 426 corresponds to a lower portion of each LED chip 3, and the driving electrodes 426 correspond to the lower electrodes 44 one by one; the number of gate lines 424 is equal to the number of rows of the array of driving electrodes 426, and the driving electrodes 426 in each row are electrically connected to the gate lines 424 through TFTs 425; the number of the source lines 423 is equal to the number of columns of the array of the driving electrodes 426, and the driving electrodes 426 in each column are electrically connected to the source lines 423 through the TFTs 425; a plurality of gate lines 424 are connected in parallel to a gate driver IC427, and a plurality of source lines 423 are connected in parallel to a source driver IC 428. The lower substrate 45 is further provided with a plurality of wires 442 facing the polymer dispersed liquid crystal layer 43, the plurality of wires 442 are in one-to-one correspondence with the plurality of lower electrodes 44, and the lower electrodes 44 are electrically connected with the IC bus 5 through the wires 442.
EXAMPLE five
As shown in fig. 13, the upper electrode 42 includes a plurality of driving electrodes 426 arranged in an array, at least one driving electrode 426 is corresponding to the lower portion of each LED chip 3, and the driving electrodes 426 and the lower electrodes 44 are in one-to-one correspondence from top to bottom; the plurality of driving electrodes 426 are connected in parallel to the IC bus 422. The lower substrate 45 is further provided with a plurality of wires 442 facing the polymer dispersed liquid crystal layer 43, the plurality of wires 442 are in one-to-one correspondence with the plurality of lower electrodes 44, and the lower electrodes 44 are electrically connected with the IC bus 5 through the wires 442.
EXAMPLE six
As shown in fig. 14, the upper electrode 42 includes a plurality of driving electrodes 426; the upper substrate 41 is further provided with a plurality of TFTs 425, a plurality of source lines 423 and a plurality of gate lines 424 on a side facing the polymer dispersed liquid crystal layer 43, the plurality of TFTs 425 correspond to and are electrically connected to the plurality of driving electrodes 426 one by one, the plurality of driving electrodes 426 are arranged in an array, at least one driving electrode 426 corresponds to a lower portion of each LED chip 3, the number of the gate lines 424 is equal to the number of the rows of the array of the driving electrodes 426, and the driving electrodes 426 in each row are electrically connected to the gate lines 424 through the TFTs 425; the number of source lines 423 is equal to the number of columns of the array of driving electrodes 426, and the driving electrodes 426 in each column are electrically connected to the source lines 423 through the corresponding TFTs 425; a plurality of gate lines 424 are connected in parallel to a gate driver IC427, and a plurality of source lines 423 are connected in parallel to a source driver IC 428. The lower substrate 45 is further provided with a plurality of TFTs 8, a plurality of source lines 6 and a plurality of gate lines 7 on a side facing the polymer dispersed liquid crystal layer 43, the plurality of TFTs 8 are in one-to-one correspondence with and electrically connected to the plurality of lower electrodes 44, the number of the gate lines 7 is equal to the number of rows of the array of the lower electrodes 44, and the lower electrodes 44 in each row are electrically connected to the gate lines 7 through the corresponding TFTs 8; the number of the source lines 6 is equal to the number of columns of the array of the lower electrodes 44, and the lower electrodes 44 in each column are electrically connected to the source lines 6 through the TFTs 8; the signal source includes a gate driver IC71 and a source driver IC61, the plurality of gate lines 7 are connected in parallel to the gate driver IC71, and the plurality of source lines 6 are connected in parallel to the source driver IC 61.
Further, the back plate 10 has a certain radian, and the upper substrate 41 and the lower substrate 45 are both flexible transparent substrates, that is, the upper substrate 41 and the lower substrate 45 are both made of flexible transparent materials, such as PET, PI, PMMA, or the like.
The upper electrode 42 and the lower electrode 44 are made of ITO (indium tin oxide), and other transparent electrodes may be used instead. The reflective layer 46 includes a substrate layer and a metal layer disposed on the upper surface of the substrate layer, and the metal layer may be sputtered with metal, such as silver or other metal/other alloy.
In order to reduce the reflection effect of the upper surface of the upper substrate 41 on light, so that the light reflected from the optical film 2 to the PDLC dimming film 4 can pass through the polymer dispersed liquid crystal layer in a transparent state or be absorbed/reflected by the polymer dispersed liquid crystal layer in a non-transparent state, in the present invention, an atomizing layer is disposed on the upper surface of the upper substrate 41, that is, the upper surface of the upper substrate 41 is subjected to an atomizing treatment, and preferably, the atomizing layer employs nano-scale particles such as SiO2 silica; even the haze of the atomized layer can be 2% -50% according to actual needs.
The invention also provides a display device, which comprises the backlight module, the display screen 1 and the optical film 2, wherein the display screen 1 is preferably a TFT-LCD thin film transistor liquid crystal display screen 1; the optical film 2 is located between the display screen 1 and the LED chip 3.
Based on the display device, the present invention further provides a control method of a display device, wherein a controller 600 is disposed on the back plate 10, as shown in fig. 6, 15 and 16, the LED chip 3, the IC bus 5, the IC bus 422, the source driver IC61, the source driver IC428, the gate driver IC71 and the gate driver IC427 are all electrically connected to the controller 600; the control method comprises the following steps:
s100, acquiring the position and the width L2 of an image display area on the display screen 1;
specifically, after the controller 600 obtains the position of the image display area on the display screen 1, the position of the LED chip 3 to be lit can be known according to the position of the image display area, so as to obtain the position of the light control partition below the LED chip 3. Since at least one light control partition is correspondingly arranged below each LED chip 3, that is, the number of light control partitions may be multiple, in the present invention, the width of the light control partition to be driven is calculated according to L2, so that the number of light control partitions to be started is calculated according to the width, and the light control partitions corresponding to the number and corresponding positions are started, so as to ensure that the position of the polymer dispersed liquid crystal layer 43 corresponding to the image display area is converted into a transparent state, and the non-corresponding position is a non-transparent state, so as to ensure that no light is emitted from the periphery of the image display area, thereby avoiding the halo phenomenon at the periphery of the image display area.
S200, calculating the number of light control partitions needing to be started according to L2;
specifically, the calculating the number of light control partitions that need to be started according to L2 includes:
s201, calculating L1 according to L2 and the preset corresponding relation between L2 and the whole width L1 of the lower electrode needing to be driven;
the correspondence between L2 and L1 is:
wherein θ is a light emitting angle of the LED chip 3, D1 is a height from the upper surface of the upper substrate 41 to the lower surface of the optical film 2, D2 is a thickness of the optical film 2, D3 is a height from the upper surface of the optical film 2 to the lower surface of the display screen 1, D4 is a thickness of the display screen 1, n1 is a refractive index of air, n2 is a refractive index of the optical film 2, and n3 is a refractive index of the display screen 1.
S202, acquiring the width of a single lower electrode 44, and calculating the number of lower electrodes needing to be driven according to L1; specifically, the number of lower electrodes that need to be driven is equal to the ratio of L1 to the width of a single lower electrode 44; after the controller 600 acquires L2, θ, D1, D2, D3, D4, n1, n2, and n3, L1, i.e., the width of the lower electrode 44 corresponding to the image display region, can be calculated according to the correspondence. The width of each lower electrode 44 is obtained in advance, and according to L1 and the width of each lower electrode 44, the number of lower electrodes 44 to be driven can be obtained.
S203, calculating the number of light control partitions needing to be started according to the number of lower electrodes needing to be driven and the number of lower electrodes contained in each light control partition.
S300, opening the light control subareas corresponding to the positions and the number of the image display areas.
Specifically, at the position corresponding to the image display area, the controller 600 drives the number of light-controlling partitions through the IC bus 5 or through the gate driver IC71 and the source driver IC61 to ensure that the liquid crystal layer between the lower electrode and the upper electrode 42 in the activated state is changed into a transparent state, so that the light reflected by the optical film 2 can penetrate and reach the reflective layer 46. Further, when the upper electrode 42 is a full-surface electrode, the light control sub-regions corresponding to the positions and the number of the image display regions are turned on, and the upper electrode 42 is turned on; when the upper electrode 42 is composed of a plurality of driving electrodes 426, the light-controlling sub-areas corresponding to the positions and the number of the image display areas are turned on, and the driving electrodes corresponding to the light-controlling sub-areas are driven, that is, the driving electrodes corresponding to the lower electrodes in the light-controlling sub-areas are driven.
In summary, the present invention provides a backlight module, a display device and a control method thereof, where the backlight module includes a back panel, a PDLC dimming film disposed on the back panel, and a plurality of LED chips disposed on the PDLC dimming film, the plurality of LED chips are divided into a plurality of light-emitting areas which are respectively and independently controlled, the PDLC dimming film includes a plurality of light-controlling partitions, and each light-emitting area at least corresponds to one light-controlling partition. In the invention, after an image display area on the display screen is determined, the position of an LED chip corresponding to the image display area is determined, a light control partition corresponding to the LED chip is opened, and light control partitions at other positions are kept in a closed state; the started light control subarea can reflect light rays emitted by the light emitting area, the light rays are emitted to the display screen for display after being reflected, and the light rays outside the light emitting area are absorbed or scattered by the PDLC light modulation film and cannot be reflected to the display screen, so that the reflected light is eliminated on the periphery of the corresponding light emitting area on the display screen, and the purpose of eliminating halation on the display screen when the LED chip is lightened is achieved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a backlight module, its characterized in that, backlight module includes the backplate, sets up PDLC membrane of adjusting luminance on the backplate and sets up a plurality of LED chips on the PDLC membrane of adjusting luminance, a plurality of LED chips divide into a plurality of light-emitting areas of independent control respectively, PDLC membrane of adjusting luminance includes a plurality of accuse light subregion, every light-emitting area at least corresponds one accuse light subregion.
2. The backlight module as claimed in claim 1, wherein the PDLC dimming film comprises an upper substrate, a lower substrate, a polymer dispersed liquid crystal layer disposed between the upper substrate and the lower substrate, and a reflective layer disposed on a side of the lower substrate away from the polymer dispersed liquid crystal layer.
3. The backlight module as claimed in claim 2, wherein the upper substrate has an upper electrode on a side facing the polymer dispersed liquid crystal layer, the lower substrate has a plurality of lower electrodes on a side facing the polymer dispersed liquid crystal layer, the plurality of lower electrodes are individually controllable, and each of the light-controlling partitions includes at least one lower electrode.
4. The backlight module as claimed in claim 3, wherein a plurality of conductive wires are disposed on a side of the lower substrate facing the polymer dispersed liquid crystal layer, and each of the lower electrodes corresponds to one of the conductive wires and is electrically connected to the IC bus via the conductive wire.
5. The backlight module according to claim 3, wherein the lower substrate is further provided with a plurality of TFTs, a plurality of source lines and a plurality of gate lines on a side facing the polymer dispersed liquid crystal layer, each of the plurality of lower electrodes corresponds to one TFT, the plurality of lower electrodes are arranged in an array, and all the lower electrodes in each row correspond to one gate line and are electrically connected to the corresponding gate line through the TFTs, respectively; all the lower electrodes in each column correspond to a source line and are electrically connected with the corresponding source line through the TFT respectively; the plurality of gate lines are connected in parallel to the gate driving IC, and the plurality of source lines are connected in parallel to the source driving IC.
6. A backlight module according to claim 3, wherein the upper electrode covers the polymer dispersed liquid crystal layer.
7. The backlight module as claimed in claim 3, wherein the upper electrode comprises a plurality of driving electrodes individually controllable, and the driving electrodes are in one-to-one correspondence with the lower electrodes.
8. A display device comprising the backlight module of any of claims 1-7, further comprising a display screen and an optical film disposed on a side of the plurality of LED chips facing away from the PDLC dimming film, the optical film being positioned between the display screen and the LED chips.
9. A control method of a display device, characterized by comprising:
acquiring the position and the width L2 of an image display area on a display screen;
calculating the number of light control partitions needing to be started according to L2;
and opening the light control subareas corresponding to the positions and the number of the image display areas.
10. The control method of claim 9, wherein the calculating the number of light management sections to be activated according to L2 comprises:
calculating L1 according to L2 and the preset corresponding relation between L2 and the whole width L1 of the lower electrode needing to be driven;
acquiring the width of a single lower electrode, and calculating the number of lower electrodes needing to be driven according to L1;
and calculating the number of the light control subareas needing to be started according to the number of the lower electrodes needing to be driven and the number of the lower electrodes contained in each light control subarea.
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| CN201910813428.0A CN112445023A (en) | 2019-08-29 | 2019-08-29 | Backlight module, display equipment and control method thereof |
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| CN114167648A (en) * | 2021-12-08 | 2022-03-11 | 武汉华星光电技术有限公司 | Backlight module, preparation method thereof and display panel |
| CN115128866A (en) * | 2022-06-15 | 2022-09-30 | 广州卓奥科技有限公司 | Regional backlight structure and display panel |
| WO2024217372A1 (en) * | 2023-04-21 | 2024-10-24 | 京东方科技集团股份有限公司 | Switchable glass, switchable glass system, and control method therefor |
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| CN104266116A (en) * | 2014-10-09 | 2015-01-07 | 深圳市华星光电技术有限公司 | Backlight structure and liquid crystal display screen |
| CN108897169A (en) * | 2018-07-25 | 2018-11-27 | 京东方科技集团股份有限公司 | Illuminating module and its control method, display device |
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| US20140293188A1 (en) * | 2013-04-01 | 2014-10-02 | Apple Inc. | Displays with Local Dimming Elements |
| CN104266116A (en) * | 2014-10-09 | 2015-01-07 | 深圳市华星光电技术有限公司 | Backlight structure and liquid crystal display screen |
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| CN114167648A (en) * | 2021-12-08 | 2022-03-11 | 武汉华星光电技术有限公司 | Backlight module, preparation method thereof and display panel |
| CN115128866A (en) * | 2022-06-15 | 2022-09-30 | 广州卓奥科技有限公司 | Regional backlight structure and display panel |
| WO2024217372A1 (en) * | 2023-04-21 | 2024-10-24 | 京东方科技集团股份有限公司 | Switchable glass, switchable glass system, and control method therefor |
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