WO2015168955A1 - 背光模组、显示装置及其驱动方法 - Google Patents

背光模组、显示装置及其驱动方法 Download PDF

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Publication number
WO2015168955A1
WO2015168955A1 PCT/CN2014/077478 CN2014077478W WO2015168955A1 WO 2015168955 A1 WO2015168955 A1 WO 2015168955A1 CN 2014077478 W CN2014077478 W CN 2014077478W WO 2015168955 A1 WO2015168955 A1 WO 2015168955A1
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Prior art keywords
light source
color
backlight module
pixel
sub
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Ceased
Application number
PCT/CN2014/077478
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English (en)
French (fr)
Inventor
康志聪
樊勇
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/380,900 priority Critical patent/US20160247464A1/en
Publication of WO2015168955A1 publication Critical patent/WO2015168955A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • 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
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module, a display device, and a driving method thereof. Background technique
  • liquid crystal displays LCDs
  • FSC Field Seqiiential Color
  • the display principle of the existing FSC liquid crystal display is that each frame of image is divided into three color fields.
  • the backlight module emits only red light and drives the liquid crystal module to display the red portion of the frame image; in the second color field, the backlight module emits only green light and is driven by The liquid crystal module displays the green portion of the image of the frame; in the third color field, the backlight module emits only blue light and drives the liquid crystal module to display the blue portion of the frame image.
  • the three color fields can be combined into the frame image.
  • the existing FSC liquid crystal display has at least the following technical problems: In the display process, if the human eye moves relative to the FSC liquid crystal display, the three color fields sequentially seen by the human eye will fall in different positions in the human eye. Then, the red part, the green part and the blue part of the frame image will be misaligned into a distorted image, that is, a Color Break Up phenomenon occurs. Summary of the invention
  • An object of the present invention is to provide a backlight module, a display device and a driving method thereof, which can improve the technical problem that a color crack phenomenon occurs in an existing FSC liquid crystal display.
  • the present invention provides a backlight module including a first color light source, a second color light source, and a second color phosphor disposed around the first color light source or the second color light source;
  • the energy level of the first color or the second color is higher than the energy level of the third color.
  • the first color light source is a red light source
  • the second color light source is a blue light source
  • the third color phosphor is a green phosphor disposed around the blue light source.
  • the green phosphor is a sulfide phosphor, a citric acid a phosphor, a phosphoric acid a phosphor, a boric acid a phosphor, a citrate phosphor or an oxynitride phosphor.
  • the first color light source and the second color light source are independently driven.
  • the backlight module further includes a first driver connected to the first color light source, and a second driver connected to the second color light source.
  • the first color light source and the second color light source are both Light Emitting Diodes (LEDs).
  • the backlight module is a side-in backlight module or a direct-lit backlight module.
  • the invention also provides a display device comprising a liquid crystal module and a backlight module;
  • the liquid crystal module includes a plurality of pixel units, each of the pixel units including a clear sub-pixel, a green sub-pixel, and a blue sub-pixel;
  • the colorless sub-pixel is provided with a colorless filter layer or a filter layer, wherein the green sub-pixel is provided with a green filter layer, and the blue sub-pixel is provided with a blue filter layer;
  • the backlight module includes a red light source, a blue light source, and a green phosphor disposed around the blue light source, and the red light source and the blue light source are independently driven.
  • the present invention also provides a driving method for driving the above display device
  • splitting the blue light source in the backlight module to drive the colorless sub-pixel, the green sub-pixel, and the blue sub-pixel of each pixel unit in the liquid crystal module - in the second color field Opening a red light source in the backlight module to drive the colorless sub-pixels of each pixel unit in the liquid crystal module;
  • the first color field and the second color field constitute a frame image displayed by the display device.
  • the red light source in the backlight module is also turned on.
  • the backlight module provided by the present invention includes a first color light source, a second color light source, and a third color phosphor disposed around the first color light source or the second color light source, and first Color or second
  • the energy level of the color is higher than the energy level of the third color.
  • the backlight module includes a red light source, a blue light source, and a green phosphor disposed around the blue light source. Since the energy level of the blue light is higher than the energy level of the green light, and the energy level of the red light is lower than the energy level of the green light, the blue light source in the backlight module provided by the present invention can emit green phosphors. Green light, which is capable of emitting both blue and green light.
  • the backlight module can simultaneously emit red light, blue light, and green light, thereby synthesizing white light. Therefore, the backlight module provided by the present invention can emit white light only by using the red light source and the blue light source, and the green light source is no longer needed, thereby reducing the power consumption of the backlight module.
  • the FSC display of the two color fields can be realized, that is, each image is divided into S color fields sequentially displayed.
  • the working principle is that, in the first color field, the backlight module can emit white light, and the pixel unit of the pixel unit in the liquid crystal module is driven by the colorless sub-pixel, the green sub-pixel and the blue sub-pixel.
  • the colorless sub-pixel displays the white portion of the frame image (the main function is to increase the brightness of each pixel unit), the green sub-pixel of each pixel unit displays the green portion of the frame image, and the blue sub-pixel of each pixel unit is displayed.
  • the backlight module emits only red light, and by driving the colorless sub-pixels of each pixel unit in the liquid crystal module, the colorless sub-pixels of each pixel unit display the red portion of the frame image.
  • the backlight module and the display device provided by the invention can realize FSC display of two color fields, and can display the white part, the green part and the blue part of the frame image in the first color field of each frame, in the second color field The red portion of the frame image is displayed. Even if a color cracking phenomenon occurs, the green portion and the blue portion displayed in the first color field are not misaligned with each other. Therefore, compared with the FSC display mode of the three-color field of the existing FSC liquid crystal display, the technical solution provided by the present invention can improve the color cracking phenomenon to some extent.
  • FIG. 1 Is a schematic diagram of a liquid crystal module provided by Embodiment 1 of the present invention.
  • 2 is a schematic diagram of a backlight module according to Embodiment 1 of the present invention;
  • 3a and 3b are schematic diagrams showing a driving method of a display device according to Embodiment 1 of the present invention.
  • FIGS. 4a and 4b are schematic diagrams showing a driving method of a display device according to a second embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • an embodiment of the present invention provides a liquid crystal module comprising an upper substrate 1, a lower substrate 2, and a liquid crystal 3, a spacer 4, and the like between the upper substrate 1 and the lower substrate 2.
  • the liquid crystal module includes a plurality of pixel units, each of which includes a clear sub-pixel T, a green sub-pixel G, and a blue sub-pixel ⁇ (only one pixel unit is shown in FIG. 1).
  • the colorless sub-pixel ⁇ is provided with a colorless filter layer 5 ⁇
  • the green sub-pixel G is provided with a green filter layer 5G
  • the blue sub-pixel ⁇ is provided with a blue filter layer 5 ⁇ .
  • the filter layer may not be provided in the colorless sub-pixel.
  • the embodiment of the present invention further provides a backlight module, including a first color light source, a second color light source, and a third color phosphor disposed on the circumference of the first color light source or the second color light source, wherein the first color Or the energy level of the second color is higher than the energy level of the third color.
  • a backlight module including a first color light source, a second color light source, and a third color phosphor disposed on the circumference of the first color light source or the second color light source, wherein the first color Or the energy level of the second color is higher than the energy level of the third color.
  • the first color light source is a red light source 6R
  • the second color light source is a blue light source 6 ⁇
  • the third color phosphor is disposed in the blue color.
  • the green phosphor 7G around the color light source 6 ⁇ .
  • both the red light source 6R and the blue light source 6B are preferably LEDs.
  • the green phosphor 7G can be a sulfide phosphor, an aluminate phosphor, a phosphate phosphor, a borate phosphor, a silicate phosphor or a oxynitride phosphor.
  • the side-lit backlight module is taken as an example. Therefore, the backlight module further includes components such as a light guide plate 8. In other embodiments, the backlight module can also be implemented as a direct type backlight module.
  • the blue light source 6B in the backlight module provided in the embodiment is illuminated, the green phosphor 7G can be excited to emit green light, so that blue light and green light can be emitted.
  • the red light source 6R and the blue light source 6B in the backlight module are turned on, and the backlight module can simultaneously emit red light, blue light and green light, thereby synthesizing white light. Therefore, the backlight module provided by the embodiment of the present invention can emit white light only by using the red light source 6R and the blue light source 6B, and the green light source is no longer needed, thereby reducing the power consumption of the backlight module.
  • the first color light source, the second color light source, and the third color phosphor in the backlight module may be other combinations of three colors of red, blue, and green, and may also include Other colors such as yellow, cyan, magenta, etc., as long as the energy level of the first color or the second color is higher than the energy level of the third color.
  • the red light source 6R and the blue light source 6B can be independently driven.
  • a first driver (not shown) connected to the red light source 6R and a second driver (not shown) connected to the blue light source 6B may be disposed in the backlight module.
  • a driving chip can be employed as the first driver and the second driver.
  • the red light source 6R and the blue light source 6B are independently driven by the first driver and the second driver respectively.
  • the backlight module can emit white light; when the blue light source 6B is separately turned on The backlight module emits green light and blue light; when the red light source 6R is separately turned on, the backlight module emits red light.
  • the liquid crystal module and the backlight module provided by the embodiments of the present invention can realize the FSC display of the S color field, thereby improving the color cracking phenomenon of the existing FSC liquid crystal display to some extent.
  • the specific working principle of the FSC display of the two color fields will be described in detail below in conjunction with the display device provided by the embodiment of the present invention.
  • the display device provided by the embodiment of the present invention may be a liquid crystal television, a liquid crystal display, a mobile phone, a tablet computer, etc., and the display device includes the above liquid crystal module and a backlight module.
  • each frame image displayed by the display device is composed of two color fields, that is, an FSC display of two color fields.
  • the red light source 6R and the blue light source 6B in the backlight module are turned on, so that the backlight module emits white light.
  • the colorless sub-pixels of each pixel unit in the liquid crystal module are also driven!
  • Green sub-pixel G and blue sub-pixel B, the liquid crystal 3 in the colorless sub-pixel T, the green sub-pixel G and the blue sub-pixel ⁇ is deflected to a certain extent, so that the colorless sub-pixels of each pixel unit are displayed
  • the white portion of the frame image (the main function is to increase the brightness of each pixel unit), and the green sub-pixel G of each pixel unit displays the green portion of the frame image
  • the blue sub-pixel B of each pixel unit displays the blue portion of the frame image.
  • the red light source 6R in the backlight module is turned on, so that the backlight module emits only red light.
  • the colorless sub-pixels T of each pixel unit in the liquid crystal module are also driven to cause a certain degree of deflection of the liquid crystals 3 in the colorless sub-pixels, so that the colorless sub-pixels of each pixel unit are displayed.
  • the red portion of the frame image is displayed.
  • the green sub-pixel G and the blue sub-pixel ⁇ in each pixel unit are generally not driven, so that the green sub-pixel G and the blue sub-pixel ⁇ are in a dark state.
  • the backlight module emits only red light in the second color field, even if the green sub-pixel G and the blue sub-pixel ⁇ are driven, the green sub-pixel G and the blue sub-pixel are not
  • the display device provided by the embodiment of the present invention can display the white portion, the green portion, and the blue portion of the frame image in the first color field of each frame, and display the red portion of the frame image in the second color field.
  • the display device provided by the embodiment of the present invention does not misalign the green portion and the blue portion displayed in the first color field even if a color cracking phenomenon occurs. Therefore, the display device provided by the embodiment of the present invention can improve the color cracking phenomenon to some extent, compared to the FSC display mode of the three-color field of the existing FSC liquid crystal display.
  • the backlight module provided by the embodiment of the present invention, only the red light source and the blue light source are turned on, and white light can be emitted, compared to the existing backlight module composed of a red light source, a green light source, and a blue light source. Has lower power consumption.
  • the colorless sub-pixels in the pixel unit are capable of transmitting white light, thereby also improving light utilization.
  • the two color light sources red light source and blue light source
  • each frame image is divided into three color fields. If the liquid crystal display needs to be displayed at a 60Hz novel rate, the actual refresh rate should reach 180Hz. .
  • the display device provided by the embodiment of the invention can realize the FSC display of the two color fields, and divide each frame image into two color fields. If the display needs to be displayed at a refresh rate of 60 Hz, the actual refresh rate is only needed! 20Hz. Therefore, the display device provided by the embodiment of the invention has lower requirements on the refresh rate and lower requirements on the response speed (response time) of the liquid crystal. Therefore, the display device provided by the embodiment of the invention has lower cost and is easier. It is implemented in various modes such as In-Plaiie Switchkig (IPS), Vertical Alignment (VA), and Twisted Neniatic (TN).
  • IPS In-Plaiie Switchkig
  • VA Vertical Alignment
  • TN Twisted Neniatic
  • the order of the first color field and the second color field in one frame of image is not limited.
  • the first color field is displayed.
  • Embodiment 2 The liquid crystal module, the backlight module, and the display device provided in this embodiment are the same as those in the first embodiment, and the difference is that the display device is driven by another driving method.
  • each frame image displayed by the display device is also composed of two color fields, that is, an FSC display of two color fields. As shown in FIG.
  • the blue light source 6B in the backlight module is turned on, so that the backlight module emits cyan light (combined by blue light and green light).
  • the colorless sub-pixel T, the green sub-pixel G, and the blue sub-pixel ⁇ of each pixel unit in the liquid crystal module are also driven, so that the clear sub-pixel ⁇ , the green sub-pixel G, and the blue sub-pixel
  • the liquid crystal 3 in the crucible generates a certain degree of deflection, so that the colorless sub-pixels of each pixel unit display the cyan portion of the frame image, and the green sub-pixel G of each pixel unit displays the green portion of the frame image, and each pixel unit
  • the blue sub-pixel ⁇ shows the blue portion of the frame image.
  • the red light source 6R_ in the backlight module is turned on, so that the backlight module emits only red light.
  • the colorless sub-pixels T of each pixel unit in the liquid crystal module are also driven to cause a certain degree of deflection of the liquid crystals 3 in the colorless sub-pixels, so that the colorless sub-pixels of each pixel unit are displayed.
  • the red portion of the frame image is displayed.
  • the green sub-pixel G and the blue sub-pixel ⁇ in each pixel unit are generally not driven, so that the green sub-pixel G and the blue sub-pixel ⁇ are in a dark state.
  • the display device provided by the embodiment of the present invention can display the cyan portion, the green portion, and the blue portion of the frame image in the first color field of each frame, and display the red portion of the frame image in the second color field.
  • the display device provided by the embodiment of the present invention does not misalign with the cyan portion, the green portion, and the blue portion displayed in the first color field even if a color crack phenomenon occurs.
  • the display device provided by the embodiment of the present invention can improve the color cracking phenomenon to some extent, compared to the FSC display mode of the color field of the existing FSC liquid crystal display.
  • the FSC display mode of the existing three-color field each frame image is divided into three color fields. If the liquid crystal display needs to be displayed at a refresh rate of 60 Hz, the actual drama rate is 180 Hz. .
  • the display device provided by the embodiment of the invention can realize FSC display of two color fields, and divide each frame image into two color fields, if necessary To display at a refresh rate of 60 Hz, the actual refresh rate requires only 120 Hz.
  • the display device provided by the embodiment of the invention has lower requirements on the refresh rate and lower response speed (response time) to the liquid crystal. Therefore, the display device provided by the embodiment of the invention has lower cost and is easier to IPS, VA, TN and other modes are implemented.
  • a four-primary color display including cyan, green, blue, and red is also realized.
  • the first color field there is no need to open the red light source, which further reduces the power consumption of the backlight module and reduces the light loss of the red light.
  • the order of the first color field and the second color field in one frame of image is not limited.
  • the first color field is displayed first, then the second color field is displayed, or the second color field is displayed first, and then the first color field is displayed.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the embodiment of the invention provides a general (non-FSC) display device, including the backlight module provided in the first embodiment and the second embodiment, and a common liquid crystal module.
  • the liquid crystal module includes a plurality of pixel units, and each of the pixel units includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
  • the red sub-pixel is provided with a red filter layer
  • the green sub-pixel is provided with a green filter layer
  • the blue sub-pixel is provided with a blue filter layer.
  • the backlight module provided in the first embodiment and the second embodiment is applied to a display device other than the FSC display mode.
  • the red light source and the blue light source in the backlight module do not have to be independently driven.
  • the backlight module in this embodiment is not used to implement the FSC display of the two color fields, the backlight module in this embodiment can still utilize only the red light source and the display device of the existing non-FSC display mode.
  • the blue light source emits white light without the need for a green light source, resulting in reduced power consumption and high color gamut display.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
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Abstract

一种背光模组、显示装置及其驱动方法，属于显示技术领域，改善现有的FSC液晶显示器会发生色裂现象的技术问题。该背光模组，包括第一颜色光源、第二颜色光源，以及设置于第一颜色光源或第二颜色光源周围的第三颜色荧光粉；其中，第一颜色或第二颜色的能级高于所述第三颜色的能级。该显示装置包括液晶模组和背光模组。该背光模组可用于液晶电视、液晶显示器、手机、平板电脑等显示装置。

Description

本发明涉及显示技术领域， 具体地说， 涉及一种背光模组、 显示装置及其驱动方法。 背景技术
随着显示技术的发展， 液晶显示器 （LCD) 已经成为最为常见的平板显示装置。 其中， 采用场序彩色 （Field Seqiiential Color, 簡称 FSC) 方式来显示图像的液晶显 示器， 不需要设置红、 绿、 蓝三种颜色的滤光层， 从而能够减少光损失， 提高背光源的利 用率。
现有的 FSC液晶显示器的显示原理是， 将每一帧图像分为依次显示的：三个色场。 在 第一色场中， 背光模组只发出红色光， 并通过驱动液晶模组， 以显示出该帧图像的红色部 分； 在第二色场中， 背光模组只发出绿色光， 并通过驱动液晶模组， 以显示出该帧图像的 绿色部分； 在第三色场中， 背光模组只发出蓝色光， 并通过驱动液晶模组， 以显示出该帧 图像的蓝色部分。 人眼依次看到这三个色场时， 就可以将这三个色场组合成该帧图像。
但是， 现有的 FSC液晶显示器至少存在以下技术问题： 在显示过程中， 如果人眼与 FSC 液晶显示器发生相对移动， 那么人眼依次看到的三个色场就会落在人眼中的不同位 置， 则该帧图像的红色部分、绿色部分和蓝色部分将会错位的组合成一幅失真的图像， 即 发生色裂 （Color Break Up) 现象。 发明內容
本发明的目的在于提供一种背光模组、 显示装置及其驱动方法， 以改善现有的 FSC 液晶显示器会发生色裂现象的技术问题。
本发明提供一种背光模组， 包括第一颜色光源、 第二颜色光源， 以及设置于所述第一 颜色光源或所述第二颜色光源周围的第≡颜色荧光粉；
其中， 所述第一颜色或所述第二颜色的能级高亍所述第三颜色的能级。 优选的， 所述第一颜色光源为红色光源， 所述第二颜色光源为蓝色光源， 所述第三颜 色荧光粉为设置于所述蓝色光源周围的绿色荧光粉。
优选的， 所述绿色荧光粉为硫化物荧光粉、 铠酸 a荧光粉、 磷酸 a荧光粉、 硼酸 a荧 光粉、 珪酸盐荧光粉或氮氧化物荧光粉。
优选的， 所述第一颜色光源和所述第二颜色光源分别独立驱动。
进一步，该背光模组还包括与所述第一颜色光源连接的第一驱动器， 以及与所述第二 颜色光源连接的第二驱动器。
优选的， 所述第一颜色光源和所述第二颜色光源均为发光二极管 （Light Emitting Diode, 简称 LED) 。 可选的， 所述背光模组为侧入式背光模组或直下式背光模组。
本发明还提供一种显示装置， 包括液晶模组和背光模组；
所述液晶模组包括若干个像素单元，每个所述像素单元包括无色子像素、绿色子像素 和蓝色子像素；
所述无色子像素中设置有无色滤光层或不设置滤光层，所述绿色子像素中设置有绿色 滤光层， 所述蓝色子像素中设置有蓝色滤光层；
所述背光模组包括红色光源、蓝色光源，以及设置于所述蓝色光源周围的绿色荧光粉， 所述红色光源和所述蓝色光源分别独立驱动。
本发明还提供一种对上述显示装置进行驱动的驱动方法，
在第一色场中， Γ开所述背光模组中的蓝色光源，驱动所述液晶模组中各像素单元的 无色子像素、 绿色子像素和蓝色子像素- 在第二色场中，扛开所述背光模组中的红色光源，驱动所述液晶模组中各像素单元的 无色子像素；
其中， 所述第一色场和所述第二色场组成所述显示装置所显示的一幀图像。
进一步， 在第一色场中， Γ开所述背光模组中的蓝色光源的同时， 还打开所述背光模 组中的红色光源。
本发明带来了以下有益效果；本发明提供的背光模组包括第一颜色光源、第二颜色光 源， 以及设置于第一颜色光源或第二颜色光源周围的第三颜色荧光粉且，第一颜色或第二 颜色的能级高于第三颜色的能级。 比如， 该背光模组包括红色光源、 蓝色光源， 以及设置 于蓝色光源周围的绿色荧光粉。因为蓝色光的能级高于绿色光的能级，而红色光的能级低 于绿色光的能级，所以本发明提供的背光模组中的蓝色光源发光 Βί,能够激发绿色荧光粉 发出绿色光，从而能够同时发出蓝色光和绿色光。背光模组中的红色光源和蓝色光源同^ 打开时， 该背光模组就能够同时发出红色光、 蓝色光和绿色光， 进而合成白色光。 因此， 本发明提供的背光模组只利用红色光源和蓝色光源，就能够发出白色光，不再需要绿色光 源， 认而降低了背光模组的功耗。 利用本发明提供的背光模组及显示装置能够实现两色场的 FSC显示， 也就是将每一 顿图像分为依次显示的 S个色场。其工作原理为，在第一色场中，背光模组可发出白色光, 并通过驱动液晶模组中各像素单元的无色子像素、绿色子像素和蓝色子像素，使各像素单 元的无色子像素显示出该帧图像的白色部分（主要作用是增加各像素单元的亮度）， 各像 素单元的绿色子像素显示出该帧图像的绿色部分,各像素单元的蓝色子像素显示出该帧图 像的蓝色部分。在第二色场中， 背光模组只发出红色光， 并通过驱动液晶模组中各像素单 元的无色子像素，使各像素单元的无色子像素显示出该帧图像的红色部分。人眼依次看到 这两个色场时， 就可以将这两个色场组合成该帧图像。 本发明提供的背光模组及显示装置能够实现两色场的 FSC显示， 可以在每一帧的第 一色场中显示该帧图像的白色部分、绿色部分和蓝色部分，在第二色场中显示该幀图像的 红色部分。即使发生色裂现象， 同在第一色场中显示的绿色部分和蓝色部分也不会相互错 位。 因此， 相比于现有的 FSC液晶显示器的三色场的 FSC显示方式， 本发明提供的技术 方案能够在一定程度上改善色裂现象。 本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地认说明书中变得显 而易见， 或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要 求书以及 f†图中所特别指出的结构来实现和获得。
附圏说明 地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技
Figure imgf000004_0001
图！是本发明实施例一提供的液晶模组的示意图 图 2是本发明实施例一提供的背光模组的示意图；
图 3a和图 3b是本发明实施例一提供的显示装置的驱动方法的示意图；
图 4a和图 4b是本发明实施例二提供的显示装置的驱动方法的示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术 手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是， 只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形 成的技术方案均在本发明的保护范围之内。
实施例一：
如图 1所示， 本发明实施例提供一种液晶模组， 由上基板 1、 下基板 2， 以及位于上 基板 1和下基板 2之间的液晶 3、 隔垫物 4等部分组成。 该液晶模组中包括若干个像素单 元， 每个像素单元包括无色子像素 T、绿色子像素 G和蓝色子像素 Β (图 1中仅示出了一 个像素单元） 。
其中，无色子像素 Τ中设置有无色滤光层 5Τ,绿色子像素 G中设置有绿色滤光层 5G, 蓝色子像素 Β中设置有蓝色滤光层 5Β。 在其他实施方式中， 无色子像素 Τ中也可以不设 置滤光层。
本发明实施例还提供一种背光模组， 包括第一颜色光源、第二颜色光源， 以及设置于 第一颜色光源或第二颜色光源周圈的第三:颜色荧光粉，其中，第一颜色或第二颜色的能级 高于第三.颜色的能级。
如图 2所示， 作为一个优选方案， 本发明实施例提供的背光模组中， 第一颜色光源为 红色光源 6R, 第二颜色光源为蓝色光源 6Β， 第三颜色荧光粉为设置于蓝色光源 6Β周围 的绿色荧光粉 7G。 其中， 红色光源 6R和蓝色光源 6B均优选为 LED。 绿色荧光粉 7G可 以是硫化物荧光粉、 铝酸盐荧光粉、 磷酸盐荧光粉、 硼酸盐荧光粉、 硅酸盐荧光粉或氮氧 化物荧光粉。
本实施例中， 以侧入式背光模组为例进行说明， 所以该背光模组中还包括导光板 8 等部件。 在其他实施方式中， 该背光模组也可以以直下式背光模组的方式实现。
因为蓝色光的能级高于绿色光的能级，而红色光的能级低于绿色光的能级，所以本发 明实施例提供的背光模组中的蓝色光源 6B发光时，能够激发绿色荧光粉 7G发出绿色光， 从而能够同^发出蓝色光和绿色光。 同时打开背光模组中的红色光源 6R和蓝色光源 6B, 该背光模组就能够同时发出红色光、 蓝色光和绿色光， 进而合成白色光。 因此， 本发明实 施例提供的背光模组只利用红色光源 6R和蓝色光源 6B， 就能够发出白色光， 不再需要 绿色光源， 从而降低了背光模组的功耗。
应当说明的是， 在其他实施方式中， 背光模组中的第一颜色光源、第二颜色光源及第 三颜色荧光粉， 可以是红、 蓝、 绿三种颜色的其他组合方式， 也可以包括黄色、 青色、 品 红等其他颜色， 只要保证第一颜色或第二颜色的能级高亍第三颜色的能级即可。
作为一个优选方案， 本发明实施例提供的背光模组中， 红色光源 6R和蓝色光源 6B 可分别独立驱动。 具体的， 可以在背光模组中设置与红色光源 6R连接的第一驱动器 （图 中未示出） ， 以及与蓝色光源 6B连接的第二驱动器 （图中未示出） 。 本实施例中， 可以 采用驱动芯片作为第一驱动器和第二驱动器。
利用第一驱动器和第二驱动器分别对红色光源 6R和蓝色光源 6B进行独立驱动， 当 红色光源 6R和蓝色光源 6B同时打开时，背光模组可发出白色光； 当蓝色光源 6B单独打 开时， 背光模组可发出绿色光和蓝色光； 当红色光源 6R单独打开时， 背光模组可发出红 色光。
利用本发明实施例提供的液晶模组和背光模组能够实现 S色场的 FSC显示， 从而在 一定程度上改善现有的 FSC液晶显示器的色裂现象。 两色场的 FSC显示的具体工作原理 将在以下， 结合本发明实施例提供的显示装置详细描述。
本发明实施例提供的显示装置可以是液晶电视、 液晶显示器、 手机、 平板电脑等， 该 显示装置包括上述的液晶模组和背光模组。 本发明实施例提供的显示装置的驱动方法中，显示装置所显示的每一帧图像由两个色 场组成， 即两色场的 FSC显示。
如图 3a所示， 在第一色场中， 打开背光模组中的红色光源 6R和蓝色光源 6B , 使背 光模组发出白色光。在第一色场中， 还驱动液晶模组中各像素单元的无色子像素！\ 绿色 子像素 G和蓝色子像素 B, 使无色子像素 T、 绿色子像素 G和蓝色子像素 Β中的液晶 3 产生一定程度的偏转， 使各像素单元的无色子像素 Τ显示出该帧图像的白色部分 （主要 作用是增加各像素单元的亮度） ， 各像素单元的绿色子像素 G显示出该帧图像的绿色部 分， 各像素单元的蓝色子像素 B显示出该帧图像的蓝色部分。
如图 3b所示， 在第二色场中， 打开背光模组中的红色光源 6R， 使背光模组只发出红 色光。 在第二色场中， 还驱动液晶模组中各像素单元的无色子像素 T， 使无色子像素 Τ 中的液晶 3产生一定程度的偏转， 使各像素单元的无色子像素 Τ显示出该幀图像的红色 部分。 而各像素单元中的绿色子像素 G和蓝色子像素 Β通常可以不进行驱动， 使绿色子 像素 G和蓝色子像素 Β呈现暗态。 当然， 因为在第二色场中背光模组只发出红色光， 所 以即使对绿色子像素 G和蓝色子像素 Β进行驱动，绿色子像素 G和蓝色子像素 Β也不会
这样，本发明实施例提供的显示装置就可以在每一帧的第一色场中显示该帧图像的白 色部分、绿色部分和蓝色部分， 在第二色场中显示该帧图像的红色部分， 以实现两色场的 FSC 显示。 本发明实施例提供的显示装置即使发生了色裂现象， 同在第一色场中显示的 绿色部分和蓝色部分也不会相互错位。 因此， 相比于现有的 FSC液晶显示器的:三色场的 FSC显示方式， 本发明实施例提供的显示装置能够在一定程度上改善色裂现象。 另外， 本发明实施例提供的背光模组中， 仅打开红色光源和蓝色光源， 就能够发出白 色光，相比于现有的由红色光源、绿色光源和蓝色光源组成的背光模组，具有更低的功耗。 并且， 在第一色场中， 像素单元中的无色子像素能够透出白色光， 从而也提高了光的利用 率。 此外， 相比于现有的三.种颜色的光源（红色光源、 绿色光源和蓝色光源） ， 本实施例 中两种颜色的光源（红色光源和蓝色光源）可以摆放的更加紧凑， 不同颜色的光更容易混 合均匀， 从而能够减少混光部件的使用， 以减小背光模组整体的体积。
另一方面， 现有的三色场的 FSC显示方式中， 将每一帧图像分为三个色场， 如果液 晶显示器需要以 60Hz的剧新率进行显示， 则其实际的刷新率要达到 180Hz。 而本发明实 施例提供的显示装置能够实现两色场的 FSC显示， 将每一帧图像分为两个色场， 如果需 要以 60Hz的刷新率进行显示， 则实际的刷新率只需要！ 20Hz。 因此， 本发明实施例提供 的显示装置对于刷新率的要求更低， 对液晶的响应速度（响应时间） 的要求也更低， 所以 本发明实施例提供的显示装置的成本更低， 也更容易以平面转换 （In-Plaiie Switchkig, 简 称 IPS) 、 垂直排列 (Vertical Alignment, 简称 VA) 、 扭曲向列 ( Twisted Neniatic , 简称 TN) 等多种模式来实施。
应当说明的是， 本实施例中对一幀图像中的第一色场、 第二色场的顺序并不做限定。 在显示一帧图像时， 可以先显示第一色场， 后显示第二色场， 也可以先显示第二色场， 后 显示第一色场。 实施例二： 本实施例提供的液晶模组、 背光模组、 显示装置与实施例一相同， 其不同点在于， 本 实施例采用另一种驱动方法对该显示装置进行驱动。 本发明实施例提供的显示装置的驱动方法中，显示装置所显示的每一帧图像也由两个 色场组成， 即两色场的 FSC显示。 如图 4a所示， 在第一色场中， 打开背光模组中的蓝色光源 6B, 使背光模组发出青色 光（由蓝色光和绿色光组合而成） 。在第一色场中， 还驱动液晶模组中各像素单元的无色 子像素 T、 绿色子像素 G和蓝色子像素 Β, 使无色子像素 Τ、 绿色子像素 G和蓝色子像 素 Β中的液晶 3产生一定程度的偏转， 使各像素单元的无色子像素 Τ显示出该幀图像的 青色部分， 各像素单元的绿色子像素 G显示出该帧图像的绿色部分， 各像素单元的蓝色 子像素 Β显示出该帧图像的蓝色部分。 如图 4b所示， 在第二色场中， 打开背光模组中的红色光源 6R_， 使背光模组只发出红 色光。 在第二色场中， 还驱动液晶模组中各像素单元的无色子像素 T， 使无色子像素 Τ 中的液晶 3产生一定程度的偏转， 使各像素单元的无色子像素 Τ显示出该帧图像的红色 部分。 而各像素单元中的绿色子像素 G和蓝色子像素 Β通常可以不进行驱动， 使绿色子 像素 G和蓝色子像素 Β呈现暗态。 当然， 因为在第二色场中背光模组只发出红色光， 所 以即使对绿色子像素 G和蓝色子像素 Β进行驱动，绿色子像素 G和蓝色子像素 Β也不会 透光。 这样，本发明实施例提供的显示装置就可以在每一帧的第一色场中显示该帧图像的青 色部分、绿色部分和蓝色部分， 在第二色场中显示该帧图像的红色部分， 以实现两色场的 FSC 显示。 本发明实施例提供的显示装置即使发生了色裂现象， 同在第一色场中显示的 青色部分、 绿色部分和蓝色部分也不会相互错位。 因此， 相比于现有的 FSC液晶显示器 的三.色场的 FSC显示方式， 本发明实施例提供的显示装置能够在一定程度上改善色裂现 象。 另一方面， 现有的三色场的 FSC显示方式中， 将每一帧图像分为三个色场， 如果液 晶显示器需要以 60Hz的刷新率进行显示， 则其实际的剧新率要达到 180Hz。 而本发明实 施例提供的显示装置能够实现两色场的 FSC显示， 将每一帧图像分为两个色场， 如果需 要以 60Hz的刷新率进行显示， 则实际的刷新率只需要 120Hz。 因此， 本发明实施例提供 的显示装置对于刷新率的要求更低， 对液晶的响应速度（响应时间）要求也更低， 所以本 发明实施例提供的显示装置的成本更低， 也更容易以 IPS、 VA、 TN等多种模式来实施。
此外， 相比于实施例一， 采用本实施例提供的驱动方法， 还实现了包括青色、 绿色、 蓝色、 红色的四基色彩色显示。 而且， 在第一色场中， 不需要衧开红色光源， 进一歩降低 了背光模组的功耗， 也减少了红色光的光损失。
应当说明的是， 本实施例中对一幀图像中的第一色场、 第二色场的顺序并不做限定。 在显示一帧图像时， 以先显示第一色场， 后显示第二色场， 也可以先显示第二色场， 后 显示第一色场。
实施例三：
本发明实施例提供一种普通的 （非 FSC ) 显示装置， 包括实施例一和实施例二中提 供的背光模组， 以及普通的液晶模组。该液晶模组中包括若干个像素单元， 每个像素单元 包括红色子像素、 绿色子像素和蓝色子像素。其中， 红色子像素中设置有红色滤光层， 绿 色子像素中设置有绿色滤光层， 蓝色子像素中设置有蓝色滤光层。
也就是说， 将实施例一和实施例二中提供的背光模组， 应用于非 FSC显示模式的显 示装置中。 当然， 背光模组中的红色光源和蓝色光源也并不是必须能够分别独立驱动。
虽然本实施例中的背光模组并不用于实现两色场的 FSC显示，但相比于现有的非 FSC 显示模式的显示装置，本实施例中的背光模组仍然能够只利用红色光源和蓝色光源发出白 色光， 而不需要绿色光源， 从而达到降低功耗和高色域显示的效果。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的 实施方式， 并非用以限定本发明。任何本发明所属技术领域内的技术人员， 在不脱离本发 明所揭露的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但 本发明的专利保护范围， 仍须以所附的权利要求书所界定的范围为准。

Claims

扠利耍求书
1、 一种背光模组， 包括第一颜色光源、 第二颜色光源， 以及设置于所述第一颜色光 源或所述第二颜色光源周围的第三颜色荧光粉；
其中， 所述第一颜色或所述第二颜色的能级高亍所述第三颜色的能级。
2、 如权利要求 1所述的背光模组， 其中， 所述第一颜色光源为红色光源， 所述第二 颜色光源为蓝色光源， 所述第≡颜色荧光粉为设置亍所述蓝色光源周围的绿色荧光粉。
3、 如权利要求 2所述的背光模组， 其中， 所述绿色荧光粉为硫化物荧光粉、 铝酸盐 荧光粉、 磷酸盐荧光粉、 硼酸盐荧光粉、 硅酸盐荧光粉或氮氧化物荧光粉。
4、 如权利要求 1所述的背光模组， 其中， 所述第一颜色光源和所述第二颜色光源分 别独立驱动。
5、 如权利要求 4所述的背光模组， 其中， 还包括与所述第一颜色光源连接的第一驱 动器， 以及与所述第二颜色光源连接的第二驱动器。
6、 如权利要求 1所述的背光模组， 其中， 所述第一颜色光源和所述第二颜色光源均 为 LH3。
7、 如权利要求 1所述的背光模组， 其中， 所述背光模组为侧入式背光模组或直 式 背光模组。
8、 一种显示装置， 包括液晶模组和背光模组；
所述液晶模组包括若千个像素单元，每个所述像素单元包括无色子像素、绿色子像素 和蓝色子像素；
所述无色子像素中设置有无色滤光层或不设置滤光层，所述绿色子像素中设置有绿色 滤光层， 所述蓝色子像素中设置有蓝色滤光层；
所述背光模组包括红色光源、蓝色光源，以及设置于所述蓝色光源周围的绿色荧光粉, 所述红色光源和所述蓝色光源分别独立驱动。
9、 一种对如权利要求 8所述的显示装置进行驱动的驱动方法， 其中，
在第一色场中，衧开所述背光模组中的蓝色光源，驱动所述液晶模组中各像素单元的 无色子像素、 绿色子像素和蓝色子像素；
在第二色场中，打开所述背光模组中的红色光源，驱动所述液晶模组中各像素单元的 无色子像素；
其中， 所述第一色场和所述第二色场组成所述显示装置所显示的一顿图像。
10、 如权利要求 9所述的驱动方法， 其中， 在第一色场中， 打开所述背光模组中的蓝 色光源的同 , 还打开所述背光模组中的红色光源。
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