CN108681153B - Display device and driving method thereof - Google Patents

Display device and driving method thereof Download PDF

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Publication number
CN108681153B
CN108681153B CN201810847094.4A CN201810847094A CN108681153B CN 108681153 B CN108681153 B CN 108681153B CN 201810847094 A CN201810847094 A CN 201810847094A CN 108681153 B CN108681153 B CN 108681153B
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green
pixel
light
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quantum dot
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CN108681153A (en
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周婷
陈煌彬
许志高
沈柏平
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a display device and a driving method thereof, wherein a plurality of blue LEDs and a plurality of green LEDs are driven to be alternately lightened so as to excite a quantum dot layer to emit fluorescence. And when the green light LED is lighted, the first green sub-pixel is charged, so that the first green sub-pixel emits first green light with the emission wavelength of a first peak value. When the blue LED is turned on, the second green sub-pixel is charged, so that the second green sub-pixel emits second green light with the emission wavelength of a second peak value. The first peak value and the second peak value are different, so that the color coordinate points of the first green light and the second green light on the CIE chromaticity diagram are different, and the green light corresponds to the two color coordinate points. And due to the action of the persistence of vision of human eyes, the green light seen by the human eyes is the mixed light of the first green light and the second green light, so that the color gamut range of the display device is enlarged.

Description

Display device and driving method thereof
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a driving method thereof.
Background
A Liquid Crystal Display (LCD) is a kind of flat panel Display, and has the advantages of high space utilization, low power consumption, low electromagnetic interference, etc., so that it is widely used in products such as tv, computer, mobile phone, PDA (Personal Digital Assistant, palm computer), etc. Currently, the backlight of the LCD generally adopts a blue Light Emitting Diode (LED) to excite red and green phosphors to form a white Light backlight. However, the phosphor has low luminous efficiency and wide spectral bandwidth, which is not favorable for increasing the color gamut level of the LCD. In order to improve the color gamut level, the quantum dot backlight source technology comes along, and the quantum dots are quasi-zero-dimensional nano materials and are composed of a small number of atoms; the particle size of the quantum dot is generally between 1 nm and 10nm, and as electrons and holes are limited by the quantum, a continuous energy band structure is changed into a discrete energy level structure with molecular characteristics, and the quantum dot can emit fluorescence after being excited, so that the color gamut of injected light can be changed. However, the color gamut improved in this way is still insufficient.
Disclosure of Invention
The embodiment of the invention provides a display device and a driving method thereof, which are used for improving color gamut.
Therefore, an embodiment of the present invention provides a driving method of a display device, including: the liquid crystal display comprises a liquid crystal display panel, a light source component and a quantum dot layer; the quantum dot layer is positioned on the light emitting side of the light source component and is used for emitting fluorescence after being excited by light emitted by the light source component; the light source assembly comprises a plurality of green LEDs and a plurality of blue LEDs; the liquid crystal display panel includes: a plurality of pixel units arranged in an array, each of the pixel units comprising: the pixel structure comprises a red sub-pixel, a blue sub-pixel, a first green sub-pixel and a second green sub-pixel;
the driving method includes:
driving the plurality of blue LEDs and the plurality of green LEDs to be alternately lightened so as to excite the quantum dot layer to emit fluorescence; when the plurality of green LEDs are lightened, first green light with a first peak value of emission wavelength is emitted corresponding to the first green sub-pixel; when the plurality of blue LEDs are lightened, emitting second green light with the emission wavelength of a second peak value corresponding to the second green sub-pixel; the first peak and the second peak are different.
Correspondingly, the embodiment of the invention also provides a display device which is driven by adopting the driving method provided by the embodiment of the invention.
The invention has the following beneficial effects:
according to the display device and the driving method thereof provided by the embodiment of the invention, the plurality of blue LEDs and the plurality of green LEDs are driven to be alternately lightened so as to excite the quantum dot layer to emit fluorescence. And when the green light LED is lighted, the first green sub-pixel is charged, so that the first green sub-pixel emits first green light with the emission wavelength of a first peak value. When the blue LED is turned on, the second green sub-pixel is charged, so that the second green sub-pixel emits second green light with the emission wavelength of a second peak value. The first peak value and the second peak value are different, so that the color coordinate points of the first green light and the second green light on the CIE chromaticity diagram are different, and the green light corresponds to the two color coordinate points. And due to the action of the persistence of vision of human eyes, the green light seen by the human eyes is the mixed light of the first green light and the second green light, so that the color gamut range of the display device is enlarged.
Drawings
Fig. 1 is a schematic cross-sectional structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic top view of a liquid crystal display panel according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view illustrating an lcd panel according to an embodiment of the invention;
FIG. 4 is a spectrum chart of light emitted from the LCD panel when the blue LED and the green LED are respectively turned on according to the embodiment of the present invention;
fig. 5 is a second schematic cross-sectional view illustrating an lcd panel according to an embodiment of the invention.
Detailed Description
The general color gamut refers to the sum of colors that a display device can produce, that is, the sum of colors of a triangle surrounded by color coordinates of red, green and blue three primary colors in a CIE chromaticity diagram can be regarded as the display device. In the field of display technology, the NTSC color gamut specified by the National Television Standards Committee (NTSC) is generally used as a standard. At present, a backlight source of an LCD generally consists of a blue LED and a quantum dot film, red fluorescence and green fluorescence in the quantum film are excited by the blue LED, and white light formed by mixing the red fluorescence, the green fluorescence and the blue LED backlight is excited by the blue LED. To improve the color gamut, the following method may be employed: (1) the color gamut is improved by increasing the film thickness of the color resist layer in the LCD. However, the color gamut improved in this way can only reach 110% NTSC color gamut. (2) Because the red quantum dots and the green quantum dots can emit fluorescent light with corresponding wavelengths under the excitation of blue light, and have more excellent photoelectric properties than the traditional fluorescent powder, the color gamut can be improved by replacing the red fluorescent powder and the green fluorescent powder with the red quantum dots and the green quantum dots. Therefore, the color gamut can be further improved by adopting a white light backlight source formed by exciting red quantum dots and green quantum dots by a blue LED and increasing the film thickness of a color resistance layer in an LCD, and the color gamut improved by adopting the method can only reach 120% of the color gamut of NTSC.
To further improve the color gamut of display devices, the international telecommunication union, radio communication sector (ITU-R) promulgates new color gamut standards: BT.2020 color gamut. The BT.2020 color gamut is formed by three coordinate points on a 1931CIE chromaticity diagram based on 630nm red light emitted by a 630nm laser light source, 532nm green light emitted by a 532nm laser light source and 467nm blue light emitted by a 467nm laser light source. The bt.2020 color gamut can reach 133.9% NTSC color gamut. However, the use of laser as the backlight source results in high process difficulty and cost, and thus the bt.2020 color gamut is difficult to realize.
The embodiment of the invention provides a display device and a driving method thereof, which are used for improving the color gamut of the display device.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of a display device and a driving method thereof according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that the thickness, size and shape of the individual layers in the drawings do not reflect the true scale of the display device, but are merely intended to illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
As shown in fig. 1, a display device provided in an embodiment of the present invention may include: a liquid crystal display panel 100, a light source module 200, and a quantum dot layer 300; the quantum dot layer 300 is located on the light-emitting side of the light source module 200, and the quantum dot layer 300 can be excited by light emitted from the light source module 200 to emit fluorescence. Light source assembly 200 may include a plurality of green LEDs 210 and a plurality of blue LEDs 220. Also, the liquid crystal display panel 100 may include: a plurality of pixel units 110 arranged in an array, each pixel unit 110 may include: a red sub-pixel R, a blue sub-pixel B, a first green sub-pixel G1, and a second green sub-pixel G2. Here, the red, blue, first green and second green sub-pixels R, B, G1 and G2 may be sequentially arranged in a row direction of the pixel unit.
Further, as shown in fig. 2 and 3, the liquid crystal display panel may include: the liquid crystal display panel comprises an array substrate 110 and an opposite substrate 120 which are oppositely arranged, and a liquid crystal layer packaged between the array substrate 110 and the opposite substrate 120. The array substrate 110 may include: a plurality of Gate lines Gate, a plurality of Data lines Data, a pixel electrode 111 respectively disposed in the red sub-pixel R, the blue sub-pixel B, the first green sub-pixel G1, and the second green sub-pixel G2, and a thin film transistor 112 connected to the pixel electrode 111. The pixel unit in one row corresponds to a Gate line Gate, the red sub-pixel R in one column corresponds to a Data line Data, the blue sub-pixel B in one column corresponds to a Data line Data, the first green sub-pixel G1 in one column corresponds to a Data line Data, and the second green sub-pixel G2 in one column corresponds to a Data line Data. The Gate electrode of the thin film transistor 112 is electrically connected to the corresponding Gate line Gate, the source electrode of the thin film transistor 112 is electrically connected to the corresponding Data line Data, and the drain electrode of the thin film transistor 112 is electrically connected to the corresponding pixel electrode 111. And a common electrode is also arranged on the opposite substrate or the array substrate. Specifically, taking the light emitted from the red sub-pixel R as an example, the working principle is as follows: and applying a common electrode signal to the common electrode to enable the common electrode to have a voltage. The Gate line Gate is applied with a Gate turn-on signal to control the thin film transistor 112 in the red subpixel R to be turned on. Meanwhile, a Data signal is applied to the Data line Data connected to the thin film transistor 112 in the red subpixel R, so that the Data signal is input to the pixel electrode 111 through the thin film transistor 112, and the pixel electrode 111 is charged to have a voltage. Since an electric field is provided between the pixel electrode 111 and the common electrode in the red sub-pixel R, the liquid crystal molecules in the red sub-pixel R can be driven to be inverted, so that light can be transmitted. Similarly, the light output of the blue sub-pixel B, the first green sub-pixel G1, and the second green sub-pixel G2 can be obtained in a specific embodiment, which is not described herein again.
Based on the display device, the embodiment of the invention provides a driving method. The driving method may include:
driving the plurality of blue LEDs and the plurality of green LEDs to be alternately lightened so as to excite the quantum dot layer to emit fluorescence; when the green LEDs are turned on, first green light with the emission wavelength of a first peak value is emitted corresponding to the first green sub-pixel; when the plurality of blue LEDs are lightened, emitting second green light with the emission wavelength of a second peak value corresponding to the second green sub-pixel; the first peak and the second peak are different.
According to the driving method provided by the embodiment of the invention, the plurality of blue LEDs and the plurality of green LEDs are driven to be alternately lightened so as to excite the quantum dot layer to emit fluorescence. And when the green light LED is lighted, the first green sub-pixel is charged, so that the first green sub-pixel emits first green light with the emission wavelength of a first peak value. When the blue LED is turned on, the second green sub-pixel is charged, so that the second green sub-pixel emits second green light with the emission wavelength of a second peak value. The first peak value and the second peak value are different, so that the color coordinate points of the first green light and the second green light on the CIE chromaticity diagram are different, and the green light corresponds to the two color coordinate points. And due to the action of the persistence of vision of human eyes, the green light seen by the human eyes is the mixed light of the first green light and the second green light, so that the color gamut range of the display device is enlarged.
The following is a description of a specific structure of the display device, and a driving method provided in an embodiment of the present invention is described. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
The first embodiment,
In particular implementations, the light source module may be of the side-entry type. As shown in fig. 1, the light source assembly 200 may further include: and a light guide plate 230 for guiding light emitted from the green LED210 and the blue LED220 in the light source assembly to the liquid crystal display panel 100. Also, the quantum dot layer 300 is located at a side of the light guide plate 230 facing the liquid crystal display panel 100. Quantum dot layer 300 may include: the quantum dot-based light-emitting diode comprises a film substrate, green quantum dots and red quantum dots, wherein the green quantum dots and the red quantum dots are uniformly distributed on the surface of the film substrate. Of course, the light source module may be a direct type light source module, and is not limited thereto.
In specific implementation, the peak wavelength lambda of the emitted light of the green LEDGLEDMay be 540 nm. And the green light LED can excite the red quantum dots and the green quantum dots in the quantum dot layer to enable the red quantum dots to emit wavelength peak values lambdaRQDRed light of 635nm and emission of wavelength peak lambda of green quantum dotGQD1It is 523nm green light. This can set the first peak of the first green light to 523 nm. Further, a difference between a peak value of a wavelength of the excitation light for exciting the first green light and a peak value of a wavelength of the emission light of the green LED is larger than 15 nm. This may facilitate excitation of the green quantum dots by the green LED to cause the green quantum dots to emit the first green light. In practical application, λGLEDThe design and determination can be made according to the actual application environment, and is not limited herein.
In specific implementation, the peak wavelength λ of the emitted light of the blue LEDBLEDMay be 445 nm. Moreover, the blue LED can excite the red quantum dots and the green quantum dots in the quantum dot layer to enable the red quantum dots to emit wavelength peak values lambdaRQDRed light of 635nm and emission of wavelength peak lambda of green quantum dotGQD2Green at 529 nm. This can set the second peak of the second green light to 529 nm. Of course, in practical applications, λBLEDThe design and determination can be made according to the actual application environment, and is not limited herein.
In specific implementation, as shown in fig. 1 and fig. 3, the liquid crystal display panel 100 may further include: and a color resist layer 121 disposed between the quantum dot layer 300 and the opposite substrate 120. Further, as shown in fig. 3, the color resist layer 121 may be disposed on the opposite substrate 120 and on a side of the opposite substrate 120 facing the liquid crystal layer. Alternatively, the color resist layer may be disposed on the array substrate and on a side of the pixel electrode facing the liquid crystal layer. Further, the color resistance layer 121 may include: a red color resist layer in the red subpixel R, a blue color resist layer in the blue subpixel B, and green color resist layers in the first green subpixel G1 and the second green subpixel G2.
In a specific implementation, the display device may further include: a first backlight driving unit and a second backlight driving unit. Further, the first backlight driving unit and the second backlight driving unit may be in the form of embodiments combining software and hardware aspects, respectively. For example, the first backlight driving unit may be a first backlight driving IC (Integrated Circuit), and the second backlight driving unit may be a second backlight driving IC. In practical applications, the first backlight driving IC and the second backlight driving IC may be independent ICs, or may be provided as one IC, thereby improving the integration level.
Generally, one frame of display time corresponds to one frame of display, and M consecutive frames of display time are displayed. In the driving method provided in the embodiment of the present invention, the continuous M-frame display time is divided into two frame groups; wherein each frame group includes
Figure BDA0001746843500000071
Frame display time, M is an even number;
in the first frame group of the two frame groups, the first backlight driving unit drives a plurality of green light LEDs to light up; in the second frame group, the second backlight driving unit drives the plurality of blue LEDs to light up. Therefore, the switching frequency of the green light LED and the blue light LED can be controlled according to the display picture, and the first green light and the second green light in the display picture can be subjected to color mixing in time, so that the effect of improving the color gamut of the display device is realized.
Further, in particular implementations, the first frame group and the second frame group may be sequentially presented, i.e., the first frame group may be presented before the second frame group. Wherein, M may be made equal to 2, such that the first frame group may include a first frame display time in two consecutive frames, the second frame group may include a second frame display time in two consecutive frames, and the plurality of green LEDs are driven to be lit by the first backlight driving unit during the first frame display time, and the plurality of blue LEDs are driven to be lit by the second backlight driving unit during the second frame display time. Therefore, the blue light LED and the green light LED are lightened in an alternating mode of the previous frame and the next frame, and the color mixing effect can be further improved. Or, M may be equal to 4, such that the first frame group may include a first frame display time and a second frame display time in four consecutive frames, the second frame group may include a third frame display time and a fourth frame display time in four consecutive frames, and the plurality of green LEDs may be driven to be lit by the first backlight driving unit during the first frame display time and the second frame display time, and the plurality of blue LEDs may be driven to be lit by the second backlight driving unit during the third frame display time and the fourth frame display time, so as to reduce the switching frequency of the green LEDs and the blue LEDs, and reduce power consumption. Of course, the second frame group of the two frame groups may appear before the first frame group, which is not described herein in detail.
Further, in a specific implementation, the display device may further include: a display driving unit. Wherein the display driving unit may be in the form of an embodiment combining software and hardware aspects. The display driving unit may be, for example, a display driving IC. And the display driving unit drives the first green sub-pixel to be charged in the first frame group, and drives the red sub-pixel, the blue sub-pixel and the second green sub-pixel to be charged in the second frame group. When the blue LED is turned on, the red sub-pixel, the blue sub-pixel and the second green sub-pixel are charged to emit light respectively. When the green LED is turned on, only the first green sub-pixel is charged without charging the red, blue, and second green sub-pixels, so that power consumption can be reduced. Of course, the display driving unit may also be configured to drive the red sub-pixels to be charged in the first frame group, which is determined according to the actual application environment, and is not limited herein.
According to the driving method provided by the embodiment of the invention, the first green light and the second green light are mixed in time. The following describes the driving method provided by the embodiment of the present invention with reference to fig. 1, by taking an example that a plurality of green LEDs are driven to light up by a first backlight driving unit during a first frame display time, and a plurality of blue LEDs are driven to light up by a second backlight driving unit during a second frame display time.
In the first frame display time, the green LED is lighted to emit lambdaGLED540nm green light, λGLEDGreen light at 540nm may excite red and green quantum dots in the quantum dot layer, causing the red quantum dots to emit a wavelength peak λRQDRed light of 635nm and emission of wavelength peak lambda of green quantum dotGQD1It is 523nm green light. And charging the first green sub-pixel to rotate the liquid crystal molecules corresponding to the first green sub-pixel, so that the first green sub-pixel emits light with an emission wavelength of lambdaGQD1A first green light of 523nm, i.e. a first peak of 523 nm. In the second frame display time, the blue LED is lighted to emit lambdaBLED445nm of blue light, lambdaBLEDBlue light at 445nm can excite red and green quantum dots in the quantum dot layer, causing the red quantum dots to emit a wavelength peak λRQDRed light of 635nm and emission of wavelength peak lambda of green quantum dotGQD2Green at 529 nm. Then, the red sub-pixel, the blue sub-pixel and the second green sub-pixel are charged to rotate the liquid crystal molecules corresponding to the red sub-pixel, the blue sub-pixel and the second green sub-pixel, so that the red sub-pixel emits light with an emission wavelength λRQD635nm red light, and making the blue sub-pixel emit light with a wavelength of lambdaBLEDMaking the second green sub-pixel emit blue light with emission wavelength of λ ═ 445nmGQD2A second green light of 529nm, i.e. a second peak of 529 nm. Thus, through the time lapse and the persistence of vision of human eyes, the green light seen by the human eyes is mixed light of 523nm first green light and 529nm second green light, and the mixed light is combined with lambdaRQD635nm red light and λBLED445nm blue light, so that an increase can be achievedThe effect of the color gamut of the device is displayed.
Further, after detecting the first green light emitted by the liquid crystal display panel when the green LED is turned on, and the red light, the blue light, and the second green light emitted by the liquid crystal display panel when the blue LED is turned on, the spectrum shown in fig. 4 is obtained. In fig. 4, the abscissa represents the wavelength and the ordinate represents the luminous intensity. line1 represents the emission intensity of the first green light emitted from the liquid crystal display panel when the green LED is turned on, and line2 represents the emission intensities of the red light, the blue light, and the second green light emitted from the liquid crystal display panel when the blue LED is turned on. Therefore, the luminous intensity of the first green light is greater than that of the second green light, so that the picture contrast can be improved by exciting the green quantum dots to emit the first green light by the green light LED on the basis that the blue light LED excites the green quantum dots to emit the second green light.
Example II,
Fig. 5 is a schematic structural diagram of a display device according to the present embodiment, which is modified from the quantum dot layer and the liquid crystal display panel according to the first embodiment. Only the differences between the present embodiment and the first embodiment will be described below, and the descriptions of the same parts are omitted here.
In a specific implementation, as shown in fig. 5, the liquid crystal display panel may include: the array substrate 110 and the opposite substrate 120 are oppositely arranged. The quantum dot layer 300 may be located between the array substrate 110 and the opposite substrate 120; the quantum dot layer 300 may be located on the opposite substrate 120 and on a side of the opposite substrate 120 facing the liquid crystal layer; alternatively, the quantum dot layer 300 may be located on the array substrate 110 and on a side of the array substrate 110 facing the liquid crystal layer. Also, the quantum dot layer 300 may include: a red quantum dot film disposed in the red subpixel R, and a green quantum dot film disposed in the first green subpixel G1 and the second green subpixel G2. Wherein, the green light LED can excite the red quantum dots in the red quantum dot film to make the red quantum dots emit wavelength peak value lambdaRQDIs 635nm red light, and excites the green quantum dots in the green quantum dot film to enable the green quantum dots to emit wavelength peak values lambdaGQD1It is 523nm green light. The blue light LED canTo excite the red quantum dots in the red quantum dot film to make the red quantum dots emit wavelength peak value lambdaRQDIs 635nm red light, and excites the green quantum dots in the green quantum dot film to enable the green quantum dots to emit wavelength peak values lambdaGQD1Green at 529 nm.
In specific implementation, as shown in fig. 5, the liquid crystal display panel 100 may further include: and a color resist layer 121 disposed between the quantum dot layer 300 and the opposite substrate 120. Further, as shown in fig. 5, the color resist layer 121 may be disposed on the opposite substrate 120 and on a side of the opposite substrate 120 facing the liquid crystal layer. Alternatively, the color resist layer may be disposed on the array substrate and on a side of the pixel electrode facing the liquid crystal layer. Further, the color resistance layer 121 may include: a red color resist layer in the red subpixel R, a blue color resist layer in the blue subpixel B, and green color resist layers in the first green subpixel G1 and the second green subpixel G2.
According to the driving method provided by the embodiment of the invention, the first green light and the second green light are mixed in time. The following describes the driving method provided by the embodiment of the present invention with reference to fig. 5, by taking an example that the plurality of green LEDs are driven to light up by the first backlight driving unit during the first frame display time, and the plurality of blue LEDs are driven to light up by the second backlight driving unit during the second frame display time.
In the first frame display time, the green LED is lighted to emit lambdaGLEDGreen light of 540nm, and λ may be caused by charging the first green sub-pixel to rotate the liquid crystal molecules corresponding to the first green sub-pixelGLEDGreen light transmission at 540 nm. The lambdaGLEDThe green light of 540nm can excite the green quantum dot film in the green quantum dot film to enable the green quantum dot to emit a wavelength peak value lambdaGQD1It is 523nm green light. So that the first green sub-pixel emits an emission wavelength of lambdaGQD1A first green light of 523nm, i.e. a first peak of 523 nm. In the second frame display time, the blue LED is lighted to emit lambdaBLED445nm blue light, and charging the red, blue and second green sub-pixels to make the red sub-pixel,The liquid crystal molecules corresponding to the blue sub-pixel and the second green sub-pixel are rotated to make λBLEDBlue light transmission at 445 nm. The lambdaBLEDThe 445nm blue light can excite the red quantum dots in the red quantum dot film, so that the red quantum dots emit wavelength peak lambdaRQDIs 635nm red light, and excites the green quantum dots in the green quantum dot film to enable the green quantum dots to emit wavelength peak values lambdaGQD2Green at 529 nm. Thereby making the emergent emission wavelength of the red sub-pixel be lambdaRQD635nm red light, and making the blue sub-pixel emit light with a wavelength of lambdaBLEDMaking the second green sub-pixel emit blue light with emission wavelength of λ ═ 445nmGQD2A second green light of 529nm, i.e. a second peak of 529 nm. Thus, through the time lapse and the persistence of vision of human eyes, the green light seen by the human eyes is mixed light of 523nm first green light and 529nm second green light, and the mixed light is combined with lambdaRQD635nm red light and λBLED445nm, so that an effect of improving the color gamut of the display device can be achieved.
Based on the same inventive concept, the embodiment of the invention also provides a display device which is driven by adopting the driving method provided by the embodiment of the invention. The specific structure is shown in fig. 1 to 5, which is not described herein.
In specific implementation, the display device provided in the embodiment of the present invention may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
According to the display device and the driving method thereof provided by the embodiment of the invention, the plurality of blue LEDs and the plurality of green LEDs are driven to be alternately lightened so as to excite the quantum dot layer to emit fluorescence. And when the green light LED is lighted, the first green sub-pixel is charged, so that the first green sub-pixel emits first green light with the emission wavelength of a first peak value. When the blue LED is turned on, the second green sub-pixel is charged, so that the second green sub-pixel emits second green light with the emission wavelength of a second peak value. The first peak value and the second peak value are different, so that the color coordinate points of the first green light and the second green light on the CIE chromaticity diagram are different, and the green light corresponds to the two color coordinate points. And due to the action of the persistence of vision of human eyes, the green light seen by the human eyes is the mixed light of the first green light and the second green light, so that the color gamut range of the display device is enlarged.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A method of driving a display device, comprising: the liquid crystal display comprises a liquid crystal display panel, a light source component and a quantum dot layer; the quantum dot layer is positioned on the light emitting side of the light source component and is used for emitting fluorescence after being excited by light emitted by the light source component; the light source assembly comprises a plurality of green LEDs and a plurality of blue LEDs; the liquid crystal display panel includes: a plurality of pixel units arranged in an array, each of the pixel units comprising: the pixel structure comprises a red sub-pixel, a blue sub-pixel, a first green sub-pixel and a second green sub-pixel;
the driving method includes:
driving the plurality of blue LEDs and the plurality of green LEDs to be alternately lightened so as to excite the quantum dot layer to emit fluorescence; when the plurality of green LEDs are lightened, first green light with a first peak value of emission wavelength is emitted corresponding to the first green sub-pixel; when the plurality of blue LEDs are lightened, emitting second green light with the emission wavelength of a second peak value corresponding to the second green sub-pixel; the first peak and the second peak are different.
2. The driving method according to claim 1, wherein the first green light and the second green light are temporally mixed.
3. The driving method according to claim 1, wherein a difference between a peak value of a wavelength of the excitation light for exciting the first green light and a peak value of a wavelength of the emission light of the green LED is larger than 15 nm.
4. The driving method according to claim 1, wherein the light source assembly further includes: a light guide plate for guiding the light emitted from the light source assembly to the liquid crystal display panel; the quantum dot layer is positioned on one side of the light guide plate facing the liquid crystal display panel;
the quantum dot layer includes: the quantum dot-based light-emitting diode comprises a film substrate, green quantum dots and red quantum dots, wherein the green quantum dots and the red quantum dots are uniformly distributed on the surface of the film substrate.
5. The driving method according to claim 1, wherein the liquid crystal display panel comprises: the array substrate and the opposite substrate are oppositely arranged; the quantum dot layer is positioned between the array substrate and the opposite substrate;
the quantum dot layer includes: a red quantum dot film disposed in the red sub-pixel, a green quantum dot film disposed in the first green sub-pixel and the second green sub-pixel.
6. The driving method according to claim 4 or 5, wherein the liquid crystal display panel further comprises: a color resist layer between the quantum dot layer and the counter substrate:
the color resist layer includes: the color filter comprises a red color resistance layer positioned in the red sub-pixel, a blue color resistance layer positioned in the blue sub-pixel, and a green color resistance layer positioned in the first green sub-pixel and the second green sub-pixel.
7. The driving method according to claim 1, wherein the display device further comprises: a first backlight driving unit and a second backlight driving unit;
dividing the continuous M frame display time into two frame groups; wherein each of the frame groups includes a succession of
Figure FDA0001746843490000021
Frame display time, M is an even number;
in a first frame group of the two frame groups, the first backlight driving unit drives the plurality of green LEDs to be turned on; in a second frame group, the second backlight driving unit drives the plurality of blue LEDs to light up.
8. The driving method as set forth in claim 7, wherein M is 2 or 4.
9. The driving method according to claim 7, wherein the display device further comprises: a display driving unit;
the display driving unit drives the first green sub-pixel to be charged in the first frame group, and drives the red sub-pixel, the blue sub-pixel, and the second green sub-pixel to be charged in the second frame group.
10. A display device characterized by being driven by the driving method according to any one of claims 1 to 9.
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