CN113552745A

CN113552745A - Display device and driving method thereof

Info

Publication number: CN113552745A
Application number: CN202010329340.4A
Authority: CN
Inventors: 熊充; 张吉和
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2021-10-26

Abstract

The embodiment of the application provides a display device and a driving method thereof. The display device includes: the liquid crystal display panel comprises a plurality of pixel units, wherein each pixel unit comprises one or more red sub-pixels, one or more green sub-pixels and one or more blue sub-pixels, each red sub-pixel comprises a red color resistor, each green sub-pixel comprises a green color resistor, and each blue sub-pixel comprises a blue color resistor; the backlight module comprises a first light source and a second light source, wherein the first light source can emit white light, the second light source can emit blue light, and the peak wavelength of a blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source; the backlight driving chip is used for controlling the first light source to be started in a first field sequence and controlling the second light source to be started in a second field sequence in at least partial picture display. This application short wave blue light's when can reducing the demonstration content, perhaps eliminate the short wave blue light when showing, reduce and watch the risk that display device caused the injury to the people's eye for a long time.

Description

Display device and driving method thereof

Technical Field

The invention belongs to the technical field of display, and particularly relates to a display device and a driving method thereof.

Background

Along with the development of science and technology, the electronic display equipment is applied to various fields of work and life of people, so that the work and the life are facilitated, and meanwhile, certain threats are brought to the health of people. People can use and watch terminal products such as mobile phones, computers and the like for a long time in one day. In recent years, medical research proves that blue light emitted when a terminal electronic product displays can cause certain damage to human eyes, and particularly short-wave blue light with the wavelength below 455 nm. The long-term viewing of blue light by the human eye may cause problems with macular degeneration and the like. Therefore, it is an urgent technical problem to provide a display device with low content of short-wave blue light.

Disclosure of Invention

In view of this, the present application provides a display device and a driving method thereof, which can reduce the content of short-wave blue light during display and reduce the risk of injury to human eyes when the human eyes watch the display device for a long time.

In a first aspect, an embodiment of the present application provides a display device, including:

the liquid crystal display panel comprises a plurality of pixel units, wherein each pixel unit comprises one or more red sub-pixels, one or more green sub-pixels and one or more blue sub-pixels, each red sub-pixel comprises a red color resistor, each green sub-pixel comprises a green color resistor, and each blue sub-pixel comprises a blue color resistor;

the backlight module comprises a first light source and a second light source, wherein the first light source can emit white light, the second light source can emit blue light, and the peak wavelength of a blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source;

the backlight driving chip is used for controlling the first light source to be started in a first field sequence and controlling the second light source to be started in a second field sequence in at least partial picture display. The field sequence is understood to divide the display process of one frame of picture in the time dimension, for example, the display of one frame of picture is divided into a first field sequence and a second field sequence, that is, the display of one frame of picture is divided into two time segments, the first field sequence is one time segment, the second field sequence is another time segment, and the complete picture display is realized by the two field sequences. In the embodiment of the present invention, it can also be said that, in the process of displaying the picture through the field sequential display, the first light source is controlled to be turned on in the first time period, and the second light source is controlled to be turned on in the second time period.

The display device provided by the embodiment of the application can realize display in a field sequential display mode by controlling the first light source and the second light source to be respectively started in different field sequences. The field sequential display realizes the display according to the time color mixing method, when the time interval between the field sequences is small enough, human eyes can feel that the light emitted from different field sequences appears simultaneously, so that the light emitting colors are superposed and mixed, and the display of the panel is realized.

In one driving method to which the display device provided in the embodiment of the present application can be applied, two field sequences are included in a color picture display process including at least a plurality of colors. And controlling the first light source to be started and the second light source to be closed in the first field sequence, wherein the peak wavelength of the blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source, and the sub-pixels of the three colors of red, green and blue can emit light to display in the first field sequence. The red light component in the white light penetrates through the red color resistor to be emitted to realize the display of the red sub-pixel, the green light component in the white light penetrates through the green color resistor to be emitted to realize the display of the green sub-pixel, and the short wave blue light in the white light penetrates through the blue color resistor to be emitted to realize the display of the blue sub-pixel. And controlling the second light source to be started, controlling the first light source to be closed and controlling the red sub-pixel and the green sub-pixel to display 0 gray scale in the second field sequence, wherein in the field sequence, the long-wave blue light can only penetrate through the blue color resistor to be emitted, namely the blue sub-pixel can emit light for display. Different gray scale display can be realized through mutually supporting of red light, green glow, shortwave blue light and long wave blue light to a pixel element, and shortwave blue light's content can reduce when showing, can realize the colour gamut of four primary colors simultaneously, has increased display device's colour gamut.

In another driving method to which the display device provided in the embodiment of the present application can be applied, two field sequences are included in a color picture display process including at least a plurality of colors. The first light source is controlled to be started in the first field sequence, the second light source is controlled to be closed, the peak wavelength of a blue light component in white light emitted by the first light source is smaller than the peak wavelength of blue light emitted by the second light source, the blue sub-pixel is controlled to display 0 gray scale in the field sequence, the short-wave blue light cannot penetrate through the blue color resistor and then is emitted, only the red sub-pixel and the green sub-pixel can emit light for display, and the short-wave blue light does not exist in the field sequence display. And controlling the second light source to be started, controlling the first light source to be closed and controlling the red sub-pixel and the green sub-pixel to display 0 gray scale in the second field sequence, wherein in the field sequence, the long-wave blue light can only penetrate through the blue color resistor to be emitted, namely the blue sub-pixel can emit light for display. When the driving method is adopted for displaying, short-wave blue light can be filtered, and the short-wave blue light is not generated when the display equipment displays, so that the risk of injury to human eyes caused by long-time watching of the display equipment is reduced.

Optionally, the first light source includes a plurality of first sub-light sources, and each first sub-light source includes a first blue light chip and red-green phosphor; the second light source includes a plurality of second sub light sources, each of which includes a second blue chip.

Optionally, the first light source includes a plurality of first sub-light sources, and each first sub-light source includes a first blue light chip and a yellow phosphor; the second light source includes a plurality of second sub light sources, each of which includes a second blue chip.

Optionally, the first sub-light source and the second sub-light source are integrated in the same integrated LED lamp; the integrated LED lamp includes: the light source module comprises a first bearing plate and a second bearing plate, wherein the second bearing plate is fixed on the first bearing plate, a first sub-light source is fixed on the first bearing plate, and a second sub-light source is fixed on the second bearing plate.

Optionally, the first sub-light source is integrated in the first LED lamp, and the second sub-light source is integrated in the second LED lamp.

Optionally, the peak wavelength of the blue light emitted by the first blue light chip is within a range of 445nm to 455 nm; the peak wavelength of the blue light emitted by the second blue light chip is selectable within the range of 460nm to 490nm, the backlight module comprises a light guide plate, and the first light source and the second light source are both positioned on the same side of the light guide plate;

further, the first sub light sources and the second sub light sources are alternately arranged on the same side of the light guide plate.

Optionally, the liquid crystal panel includes an array substrate, a color film substrate, and a liquid crystal molecular layer, and the liquid crystal molecular layer is located between the array substrate and the color film substrate; the color film substrate comprises a black matrix and a color resistance layer, wherein the black matrix is provided with a plurality of openings, the openings expose the color resistance layer, and the color resistance layer comprises a red color resistance, a green color resistance and a blue color resistance; the array substrate comprises a common electrode and a plurality of pixel electrodes, wherein the plurality of pixel electrodes comprise a first pixel electrode, a second pixel electrode and a third pixel electrode, the red sub-pixel comprises the first pixel electrode, the green sub-pixel comprises the second pixel electrode, and the blue sub-pixel comprises the third pixel electrode.

The display device further comprises a display driving chip, and the display driving chip is used for controlling liquid crystal molecules in the red sub-pixel, the green sub-pixel and/or the blue sub-pixel to deflect in a display picture, so that gray scale control of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel is achieved.

Based on the same inventive concept, in a second aspect, an embodiment of the present application further provides a driving method of a display device, for driving the display device provided in any embodiment of the present application to perform display, where the driving method includes:

the display process of at least part of the picture comprises a first field order and a second field order, wherein,

in the first field sequence: controlling the first light source to be turned on and controlling the second light source to be turned off;

in the second field sequence: controlling the second light source to be turned on and controlling the first light source to be turned off;

and controlling the liquid crystal molecules in the red sub-pixel, the green sub-pixel and/or the blue sub-pixel to deflect in each field sequence to realize gray scale control on the red sub-pixel, the green sub-pixel and/or the blue sub-pixel, wherein in the second field sequence, the red sub-pixel and the green sub-pixel are controlled to display 0 gray scale.

Optionally, the blue sub-pixel is controlled to display 0 gray scale in the first field sequence.

The application provides a display device and a driving method thereof, which have the following beneficial effects: the first light source can emit white light, the second light source can emit blue light, and the peak wavelength of the blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source. And the first light source and the second light source are controlled to be respectively started in different field sequences of one frame of picture, so that the display can be realized by adopting a field sequence display mode. Can reduce shortwave blue light content during the demonstration, perhaps get rid of the shortwave blue light composition when showing, reduce and watch the risk that display device caused the injury to the people's eye for a long time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of an alternative implementation of a display device provided in an embodiment of the present application;

FIG. 2 is a simplified diagram of the structure of the film layer at the position of line A-A' of FIG. 1;

fig. 3 is a partially simplified schematic diagram of an embodiment of a backlight module of a display device according to an embodiment of the present disclosure;

fig. 4 is a schematic cross-sectional view of an alternative embodiment of a backlight module of a display device according to an embodiment of the present disclosure;

fig. 5 is a partial schematic view of another alternative implementation of a backlight module of a display device according to an embodiment of the present disclosure;

fig. 6 is a partial schematic view of another alternative implementation of a backlight module of a display device according to an embodiment of the present disclosure;

fig. 7 is a partial schematic view of another alternative implementation of a backlight module in a display device according to an embodiment of the present disclosure;

fig. 8 is a schematic cross-sectional view of another alternative embodiment of a backlight module of a display device according to an embodiment of the present disclosure;

fig. 9 is another schematic top view of a backlight module of a display device according to an embodiment of the present disclosure;

fig. 10 is a schematic diagram of a driving method according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In recent years, in order to reduce the damage of blue light to human eyes, a plurality of eye-protecting and blue light-resisting products with low blue light are appeared. One of the related art low blue Light eye protection schemes is to set a peak wavelength of a blue Light LED (Light Emitting Diode) in a backlight source to move in a long wavelength direction, so as to reduce the content of short-wave blue Light during display. After the peak wavelength of the blue light LED in the above scheme is lengthened, the energy of the blue light is lowered, which may result in the reduction of the luminous efficiency of exciting the phosphor, and further, the reduction of the brightness of the panel display. In addition, because the light-transmitting wave bands of the blue color resistance and the green color resistance in the panel are overlapped, after the peak wavelength of the blue light LED is lengthened, part of the blue light wave band is emitted from the green color resistance during display, so that the green sub-pixel is impure in display, and blue shift occurs in the display; meanwhile, after the blue light band is shifted, the blue sub-pixel display may be red-shifted, which may reduce the color gamut of the display device.

Based on the above problems, the embodiment of the application improves the light source and the driving method of the display device, and realizes that the display is performed in a field sequential display mode in at least part of picture display by matching the light source and the driving method, so that the content of short-wave blue light during display is reduced, and the risk of injury to human eyes caused by long-time watching of the display device is reduced. The display device provided by the embodiment of the application can be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book or a television.

First, a light source of a display apparatus is improved by providing a light source including a first light source capable of providing white light containing a short-wavelength blue light component and a second light source capable of providing a long-wavelength blue light. Then, the two light sources are controlled to be respectively started in different field sequences during at least part of the picture display process. When the first field sequential display is carried out, the first light source is turned on, the second light source is turned off, and the red, green and blue sub-pixels can be subjected to light emitting display; and when the second field sequential display is carried out, the second light source is started, the first light source is closed, and the blue sub-pixel can emit light. Therefore, one pixel unit can realize different gray scale display through the mutual matching of red light, green light, short-wave blue light and long-wave blue light, and the content of the short-wave blue light during display can be reduced.

When the light source is selected, in order not to affect the display brightness, the excitation efficiency of the blue light chip to the fluorescent powder needs to be ensured. Therefore, in one embodiment provided by the present application, the first light source uses a short-wave blue chip to excite the phosphor to emit white light. The second light source adopts a long-wave blue light chip, and the long-wave blue light is directly emitted without exciting the fluorescent powder.

Furthermore, when the first light source is turned on, the blue sub-pixel displays 0 gray scale, and the short-wave blue light in the white light emitted by the first light source cannot be emitted by the blue sub-pixel. One pixel unit can realize different gray scale display by the mutual matching of the red light, the green light and the long-wave blue light, and the short-wave blue light component is removed when the display device displays.

The following examples will illustrate specific embodiments of the present application.

Fig. 1 is a schematic diagram of an alternative implementation of a display device provided in an embodiment of the present application. FIG. 2 is a simplified diagram of the structure of the film layer at the position of line A-A' in FIG. 1.

Referring to fig. 1 and 2 together, the display apparatus includes at least: a liquid crystal panel 100, a backlight module 200 and a backlight driving chip (not shown). Wherein,

the liquid crystal panel 100 includes a plurality of pixel units P including one or more red sub-pixels PR, one or more green sub-pixels PG, and one or more blue sub-pixels PB, and only one pixel unit P is illustrated as including one red sub-pixel PR, one green sub-pixel PG, and one blue sub-pixel PB. The red sub-pixel PR comprises a red color resistor Z1, the green sub-pixel PG comprises a green color resistor Z2, and the blue sub-pixel PB comprises a blue color resistor Z3. Fig. 1 illustrates that sub-pixels of different colors are alternately arranged to form sub-pixel rows, and sub-pixels of the same color are arranged in sub-pixel columns along the same direction, and the arrangement of sub-pixels in the panel illustrated in fig. 1 is only schematically shown and is not limited in this application. In another arrangement, the subpixels of different colors are alternately arranged in the subpixel rows and the subpixels of different colors are alternately arranged in the subpixel columns. In an actual product, the arrangement mode of the sub-pixels can be designed according to specific requirements.

As illustrated in fig. 2, the liquid crystal panel 100 includes an array substrate 101, a color filter substrate 102, and liquid crystal molecules 103 between the array substrate 101 and the color filter substrate 102. The color film substrate 102 includes a black matrix BM and a color resist layer Z, the black matrix BM has a plurality of openings K exposing the color resist layer, and the red color resist Z1, the green color resist Z2 and the blue color resist Z3 are all located on the color resist layer Z. The array substrate 101 includes a common electrode COM and a plurality of pixel electrodes including a first pixel electrode DJ1, a second pixel electrode DJ2 and a third pixel electrode DJ3, wherein the red sub-pixel PR includes a first pixel electrode DJ1, the green sub-pixel PG includes a second pixel electrode DJ2, and the blue sub-pixel PB includes a third pixel electrode DJ 3. After voltages are respectively applied to the pixel electrode and the common electrode, the liquid crystal molecules can be controlled to deflect, so that the light output quantity of the sub-pixels can be adjusted, and the display gray scale of the sub-pixels can be controlled. In fig. 2, the pixel electrode is only illustrated as being located on the side of the common electrode COM away from the liquid crystal molecules 103. The array substrate 101 includes a plurality of pixel circuits, and a transistor (not labeled) of the pixel circuit is electrically connected to a pixel electrode, and the transistor of the top gate structure is only illustrated. Alternatively, the pixel electrode may be located on a side of the common electrode close to the liquid crystal molecules. In another alternative embodiment, one of the pixel electrode and the common electrode may be located on the array substrate, and the other may be located on the color filter substrate, which is not illustrated in the drawings.

The backlight module 200 includes a first light source and a second light source, the first light source can emit white light, the second light source can emit blue light, and a peak wavelength of a blue light component in the white light emitted by the first light source is smaller than a peak wavelength of the blue light emitted by the second light source. Wherein, the peak wavelength is the wavelength corresponding to the maximum position of the spectral luminous intensity or the radiant power. That is, the blue light emitted by the first light source is not blue light with a single wavelength, and the blue light emitted by the second light source is not blue light with a single wavelength. The wavelength corresponding to the maximum light intensity among the blue light components emitted by the first light source is the peak wavelength of the blue light components emitted by the first light source. The wavelength with the maximum corresponding light intensity in the blue light emitted by the second light source is the peak wavelength of the blue light emitted by the second light source.

Optionally, the blue light emitted by the first light source is short-wave blue light, and the blue light emitted by the second light source is long-wave blue light. That is, the wavelength of the blue light emitted by the second light source is greater than the wavelength of the blue light emitted by the first light source. In one embodiment, the first light source emits blue light with a wavelength range of 400-455 nm, and the second light source emits blue light with a wavelength range of 460-490 nm.

Fig. 2 does not show the specific positions of the first light source and the second light source in the backlight module, and optionally, the backlight module 200 is a side-in type backlight module, and the backlight module further includes a light guide plate, and the first light source and the second light source are both disposed at one side of the light guide plate. Optionally, the backlight module 200 may also be a direct-type backlight module, in which the first light source and the second light source are directly disposed at a side away from the light emitting surface of the liquid crystal panel 100 without disposing a light guide plate. The specific arrangement of the light sources in different backlight modules will be illustrated in the following embodiments.

And a backlight driving chip (not shown) for controlling the first light source to be turned on in the first field sequence and the second light source to be turned on in the second field sequence during at least part of the picture display. The backlight driving chip is used for driving the backlight module 200 to work. That is to say, in practical application of the display device, when the backlight driving chip controls the light sources, the first light source may be controlled to be turned on in the first field sequence and the second light source may be controlled to be turned on in the second field sequence only in partial picture display; and in the partial picture display, only controlling the first light source to be turned on and the second light source to be turned off, or in the partial picture display, controlling the first light source to be turned off and only controlling the second light source to be turned on. When the backlight driving chip controls the light sources, the backlight driving chip can also control the first light source to be started in the first field sequence and control the second light source to be started in the second field sequence in all picture display.

The field sequence is understood to be a division of a display process of a frame of picture in a time dimension, for example, the display of the frame of picture is divided into a first field sequence and a second field sequence, that is, the display of the frame of picture is divided into two time periods, the first field sequence is a time period, the second field sequence is another time period, and complete picture display is realized by the two field sequences, wherein the first field sequence and the second field sequence do not represent a time sequence, and the first field sequence and the second field sequence may be that a first light source is turned on first or that a second light source is turned on first. In the embodiment of the present invention, it can also be said that, in the process of displaying the picture through the field sequential display, the first light source is controlled to be turned on in the first time period, and the second light source is controlled to be turned on in the second time period.

In the display device provided by the embodiment of the application, the liquid crystal panel further comprises a lower polarizer and an upper polarizer. The lower polarizer is located on one side, close to the backlight module, of the array substrate, the upper polarizer is located on one side, close to the light emitting surface of the liquid crystal panel, of the color film substrate, and the light quantity penetrating through the liquid crystal panel can be controlled through the mutual cooperation of the upper polarizer, the lower polarizer and liquid crystal molecules, so that the control of the display gray scale of the sub-pixels is achieved.

In the embodiment of the present application, the first light source can emit white light, the second light source can emit blue light, and a peak wavelength of a blue light component in the white light emitted by the first light source is smaller than a peak wavelength of the blue light emitted by the second light source. In at least partial picture display, the display is realized by adopting a field sequential display mode by controlling the first light source and the second light source to be respectively started in different field sequences. The field sequential display realizes the display according to the time color mixing method, when the time interval between the field sequences is small enough, human eyes can feel that the light emitted from different field sequences appears simultaneously, so that the light emitting colors are superposed and mixed, and the display of the panel is realized. In practical applications, a display device usually displays a color picture containing multiple colors, but depending on the application scene, the display device may need to display a single color picture in some cases. In the embodiment of the application, at least in the color picture display containing a plurality of colors, the first light source and the second light source are controlled to be respectively started in different field sequences, wherein the whole display area of the liquid crystal panel is scanned once during each field sequence display, which is equivalent to that the first field sequence display image and the second field sequence display image are overlapped to form an image displayed in one frame. A driving method to which the display device provided in the embodiment of the present application can be applied is exemplified below.

In a first driving method that can be applied to a display device provided in an embodiment of the present application, at least a color picture display process including a plurality of colors includes a first field order and a second field order. Wherein,

and in the first field sequence, the first light source is controlled to be started, the second light source is controlled to be closed, the first light source emits white light, wherein the peak wavelength of a blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source, and optionally, the blue light component in the white light emitted by the first light source is short-wave blue light. In the first field sequence, the sub-pixels of three colors of red, green and blue can all display light. The liquid crystal panel comprises a plurality of sub-pixel lines, and in the first field sequence, the plurality of sub-pixel lines are scanned line by line, so that liquid crystal molecules in each sub-pixel are controlled to deflect correspondingly, and the sub-pixels can be controlled to display corresponding gray scales. The red light component in the white light penetrates through the red color resistor to be emitted to realize the display of the red sub-pixel, the green light component in the white light penetrates through the green color resistor to be emitted to realize the display of the green sub-pixel, and the short wave blue light in the white light penetrates through the blue color resistor to be emitted to realize the display of the blue sub-pixel.

And controlling the second light source to be started, controlling the first light source to be closed and emitting blue light by the second light source in the second field sequence, wherein the blue light is long-wave blue light. In the second field sequence, the plurality of sub-pixel lines are scanned line by line, liquid crystal molecules in each sub-pixel are controlled to deflect correspondingly, and the sub-pixels can be controlled to display corresponding gray scales. The liquid crystal molecules are controlled to deflect, the red sub-pixel and the green sub-pixel are controlled to display 0 gray scale, the sub-pixel displays 0 gray scale, namely the sub-pixel displays the darkest brightness, the red sub-pixel and the green sub-pixel are controlled to be closed in the second field sequence, and the red sub-pixel and the green sub-pixel are not displayed. The following description related to the sub-pixel displaying the 0 gray scale can be understood with reference to the drawings. In the second field sequence, the long-wave blue light can only penetrate through the blue color resistor to be emitted, namely, the blue sub-pixel can emit light for display. And because the green sub-pixel is controlled to display the 0 gray scale, even if the light transmitting wave bands of the green color resistor and the blue color resistor are overlapped, the long-wave blue light cannot penetrate through the green color resistor and then affects the display of the green sub-pixel, and all the red sub-pixels are controlled to display the 0 gray scale in the same way, and the long-wave blue light cannot affect the display of the red sub-pixel.

Taking one pixel unit as an example, the red light, the green light and the short-wave blue light are respectively emitted by the red sub-pixels, the green sub-pixels and the blue sub-pixels in the first field sequence, and the long-wave blue light is emitted by the blue sub-pixels in the second field sequence, so that the gray scale display of one pixel unit can be realized by performing superposition color mixing. And when the first field sequential display is carried out, three primary colors of red, green and short-wave blue light can be obtained; and when the second field sequential display is carried out, the fourth primary color light of the long-wave blue light can be obtained. In the field sequential display device that this application embodiment provided, a pixel unit can realize different grey scale through mutually supporting of red light, green glow, shortwave blue light and long wave blue light and show, and the content of shortwave blue light can be reduced when showing, can realize the colour gamut of four primary colors simultaneously, has increased display device's colour gamut.

In a second driving method that can be applied to the display device provided in the embodiment of the present application, at least during a color picture display process including a plurality of colors, the display device includes a first field sequence and a second field sequence. Wherein,

and in the first field sequence, the first light source is controlled to be started, the second light source is controlled to be closed, the first light source emits white light, wherein the peak wavelength of a blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source, and optionally, the blue light component in the white light emitted by the first light source is short-wave blue light. In the first field sequence, a plurality of sub-pixel rows in the liquid crystal display panel are scanned line by line, liquid crystal molecules in each sub-pixel are controlled to deflect, and the control on the gray scale display of the sub-pixels is realized, wherein the blue sub-pixels are controlled to display the 0 gray scale, short-wave blue light cannot penetrate through the blue color resistor and then is emitted, only the red sub-pixels and the green sub-pixels can emit light for display, namely, the short-wave blue light is not emitted in the first field sequence display.

And in the second field sequence, the backlight driving chip controls the second light source to be started, controls the first light source to be closed, and emits blue light, wherein the blue light emitted by the second light source is long-wave blue light. In the second field sequence, the plurality of sub-pixel lines are scanned line by line, liquid crystal molecules in each sub-pixel are controlled to deflect correspondingly, and the sub-pixels can be controlled to display corresponding gray scales. And in the second field sequence, the long-wave blue light only penetrates through the blue color resistor to be emitted, namely the blue sub-pixel can emit light for display. And because the green sub-pixel is controlled to display 0 gray scale, even if the light transmitting wave bands of the green color resistance and the blue color resistance are overlapped, the long-wave blue light cannot penetrate through the green color resistance to influence the display of the green sub-pixel, and the same long-wave blue light cannot influence the display of the red sub-pixel.

Taking one pixel unit as an example, the light emitted by the red and green sub-pixels in the first field sequence and the long-wave blue light emitted by the blue sub-pixel in the second field sequence are overlapped and mixed to realize the gray scale display of one pixel unit. When the display equipment provided by the embodiment of the application adopts the driving method to display, short-wave blue light can be filtered, the short-wave blue light is not generated when the display equipment displays, and the risk of injury to human eyes caused by long-time watching of the display equipment is reduced.

Further, the display device provided in the embodiment of the present application further includes: a display driving chip; the display driving chip is used for respectively controlling liquid crystal molecules in each color sub-pixel to deflect in picture display so as to realize gray scale control of each color sub-pixel. That is, the liquid crystal molecules in the red sub-pixel, the green sub-pixel, and/or the blue sub-pixel are controlled to be deflected in the display screen, thereby realizing the gray scale control of the red sub-pixel, the green sub-pixel, and/or the blue sub-pixel. When displaying, the display driving chip respectively applies voltage signals to the common electrode and the pixel electrode through the control of the system mainboard, so that an electric field for controlling the deflection of liquid crystal molecules is formed between the common electrode and the pixel electrode, the electric field intensity is different, the deflection degree of the liquid crystal molecules is different, the light quantity emitted by the sub-pixels can be controlled, and the gray scale displayed by the sub-pixels is controlled. When the display device applies the second driving method, the display driving chip is further configured to control all the blue subpixels to display the 0 gray scale in a field sequence in which the first light source is turned on. Thereby realizing that short-wave blue light does not exist in one frame of picture display.

That is to say, when one frame of picture is displayed, the backlight driving chip and the display driving chip are required to be matched, wherein the backlight driving chip is used for controlling the display panel to realize the work of the displayed light source, and the display driving chip is used for controlling the sub-pixels in the display panel to realize different gray scale display, so as to realize the color picture display.

Optionally, in the display device provided in this embodiment of the present application, when displaying a partial single-color picture, the backlight driving chip controls only one of the first light source and the second light source to be turned on.

Taking the red image display as an example, the backlight driving chip is used for controlling the first light source to be turned on and the second light source to be turned off when the red image is displayed, that is, the first light source is controlled to be turned on in the first field sequence and the second light source is controlled to be turned off in the second field sequence. When the first light source is turned on, the first light source can emit white light, the display driving chip simultaneously controls the red sub-pixel in the display panel to be turned on, and controls the green sub-pixel and the blue sub-pixel to display 0 gray scale, so that red light components in the white light emitted by the first light source are emitted only after passing through the red color resistance corresponding to the red sub-pixel, and the red sub-pixel displays red, thereby realizing red image display. The description of displaying the red screen can be understood with reference to the description of displaying the green screen.

When a blue picture is displayed, the backlight driving chip controls the first light source to be closed, the second light source is opened, when the second light source is opened, the display driving chip simultaneously controls the blue sub-pixel in the display panel to be opened, the green sub-pixel and the red sub-pixel are controlled to display 0 gray scale, long-wave blue light which can be emitted by the second light source is emitted after passing through the blue color resistance corresponding to the blue sub-pixel, and the blue sub-pixel displays blue, so that the blue picture display is realized, and the blue picture display is carried out by the long-wave blue light.

Optionally, in the display device provided in this embodiment of the present application, when a part of a single-color picture is displayed, the backlight driving chip still controls the first light source to be turned on in the first field sequence, and controls the second light source to be turned on in the second field sequence. That is, when displaying a color picture including a plurality of colors and displaying a single color picture, the backlight driving chip controls the light sources in the same manner, and the driving timing sequence of the backlight driving chip for the first light source and the second light source does not need to be changed, so that the backlight driving manner is simpler.

Taking red image display as an example, when the red image needs to be displayed, the backlight driving chip controls the first light source to be turned on in the first field sequence, and controls the second light source to be turned on in the second field sequence. When the first field sequence first light source is started, the first light source can emit white light, the display driving chip simultaneously controls the red sub-pixel in the display panel to be started, the green sub-pixel and the blue sub-pixel are controlled to display 0 gray scale, then the red light component in the white light emitted by the first light source is emitted after passing through the red color resistance corresponding to the red sub-pixel, the red sub-pixel displays red, and the first field sequence display panel displays red on the whole surface. When the second field sequence second light source starts, the second light source only emits blue light, and at the moment, the blue sub-pixel display is not needed, the red sub-pixel, the green sub-pixel and the blue sub-pixel are controlled by the display driving chip to display 0 gray scale, namely, the light is not emitted from the second field sequence display panel, and only the red light emitted from the first field sequence is displayed after the light emitting of the first field sequence and the light emitting of the second field sequence are superposed and mixed. For the green picture, the description of the red picture can be referred to for understanding, and the description is omitted here. In one embodiment, the backlight module is a side-in type backlight module, which includes a light guide plate; the first light source and the second light source are both positioned on the same side of the light guide plate. The first light source and the second light source are manufactured on the same lamp strip and are arranged on one side of the light guide plate, the number of the LED lamps in the light source can be reduced, the manufacturing cost is reduced, and meanwhile the power consumption is reduced.

Fig. 3 is a partially simplified schematic diagram of an alternative implementation of a backlight module of a display device according to an embodiment of the present application. Fig. 4 is a schematic cross-sectional view of an alternative implementation manner of a backlight module of a display device according to an embodiment of the present application. As illustrated in fig. 3, the first light source Y1 and the second light source Y2 are both located on the same side of the light guide plate 201. As shown in fig. 4, the backlight module further includes an optical film assembly 202, and the optical film assembly 202 includes a lower diffusion sheet 2021, a prism sheet 2022, an upper diffusion sheet 2023, and the like stacked together. With continued reference to fig. 4, only the first light source Y1 on one side of the light guide plate 201 is shown, the side M of the light guide plate 201 away from the light emitting surface is provided with a dot structure (not shown), and the side of the light guide plate 201 away from the optical film set 202 is further provided with a reflective sheet 203. The light emitted from the first light source Y1 into the light guide plate 201 changes the propagation direction of the light after the light diffusion effect of the dot structure in the light guide plate 201, and then sequentially penetrates through the optical film set 202, thereby forming a uniform surface light source.

Fig. 4 is only described as the case where the first light source Y1 is turned on to form a surface light source, and similarly, in the side-type backlight module, the second light source is disposed on one side of the light guide plate, and when the second light source is turned on, light entering the light guide plate from the second light source passes through the light guide plate and the optical film group to form a surface light source. That is, in the field sequential display where the first light source is turned on or the second light source is turned on, the backlight module can provide a surface light source to the liquid crystal panel.

In an embodiment, fig. 5 is a partial schematic view of another alternative implementation of a backlight module of a display device according to an embodiment of the present disclosure. As shown in fig. 5, the first light source includes a plurality of first sub-light sources Y11, each of the first sub-light sources Y11 includes a first blue chip D1, a red phosphor S1 and a green phosphor S2, the first blue chip D1 can emit blue light, and the red phosphor S1 and the green phosphor S2 are excited by the blue light to emit red and green light, so that the first sub-light source Y11 can provide white light. During manufacturing, the red fluorescent powder and the green fluorescent powder are mixed in the sealing glue, and the sealing glue is applied to the first blue light chip D1 in a point coating mode. The red fluorescent powder can be any one of red fluorescent powder and green fluorescent powder in the prior art. The second light source comprises a plurality of second sub-light sources Y22, each second sub-light source Y22 comprises a second blue light chip D2, the second blue light chip D2 does not need to excite fluorescent powder, and when the sealant needs to be dispensed, the sealant which is not doped with the fluorescent powder is directly dispensed. Alternatively, as illustrated in the drawing, the first sub-light sources Y11 and the second sub-light sources Y22 are alternately arranged on the same side of the light guide plate 201. When displaying, the first light source and the second light source are respectively started in different field sequences, and the mode that the first sub-light source Y11 and the second sub-light source Y22 are alternately arranged can ensure that light rays can be uniformly injected into one side of the light guide plate 201 when the first sub-light source Y11 is independently started or the second sub-light source Y22 is independently started, so that the brightness uniformity of the surface light source is ensured, and the brightness uniformity of the display panel is further ensured. Optionally, the first sub light source group and the second sub light source group are alternately arranged on the same side of the light guide plate, wherein the first sub light source group includes at least two first sub light sources, and the second sub light source group includes at least two second sub light sources.

In this embodiment, the peak wavelength of the blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source, and optionally, the first blue light chip in the first sub-light source is a short-wave blue light chip, and the second blue light chip in the second sub-light source is a long-wave blue light chip. First blue light chip is the shortwave blue light chip, then first blue light chip can guarantee to the excitation efficiency of red phosphor powder and green phosphor powder, guarantees the luminance of red subpixel and green subpixel in the field sequential display that first light source opened, guarantees not to have the influence to the luminance that shows. Therefore, when at least part of pictures are displayed, the content of short-wave blue light during display can be reduced in a field sequential display mode, or the blue light component during display is eliminated, and the color gamut of display is not influenced.

It should be noted that the structure of the chip in fig. 5 is only shown in a simplified schematic, and each chip actually further includes a positive electrode and a negative electrode, and the chip is controlled to emit light after voltages are applied to the positive electrode and the negative electrode, respectively. In the display device provided by the embodiment of the application, when the first light source is required to be turned on during displaying, all the first sub-light sources are turned on. When the second light source is required to be started, all the second sub-light sources are started.

Continuing to illustrate with reference to FIG. 5, the first sub-light source Y11 is integrated into a first LED lamp and the second sub-light source Y22 is integrated into a second LED lamp. The bracket 30 of the LED lamp is also illustrated, but the overall LED lamp structure is not labeled. It is understood that, for the first LED lamp, the first sub light source Y11 is the first blue light chip D1 and the phosphor integrated in the LED lamp, that is, the first LED lamp includes the support 30, the first blue light chip D1 and the phosphor. For the second LED lamp, the second sub light source Y22 is the second blue light chip D2 integrated in the LED lamp, that is, the second LED lamp includes the bracket 30 and the second blue light chip D2. The first LED lamps and the second LED lamps are alternately arranged in the backlight lamp bar. The first blue light chip and the second blue light chip can be both flip chips or can be both normal chips. During manufacturing, the first blue light chip D1 is fixed on the support 30, the support 30 may be a cup-shaped structure as illustrated in fig. 5, and then red and green fluorescent powder is spot-coated on one side of the light emitting surface of the first blue light chip D1 to form a first LED lamp, so that the first LED lamp can emit white light with short-wave blue light components. During manufacturing, the second blue light chip D2 is fixed on the bracket 30 with the cup-shaped structure, and the light-emitting surface of the second blue light chip D2 does not need to be spot-coated with fluorescent powder, so that a second LED lamp is formed, and the second LED lamp can emit long-wave blue light. In the manufacturing process, the lamp group with the first LED lamps and the second LED lamps which are alternately arranged can be integrally manufactured, and then the backlight lamp bar is formed by cutting.

In an embodiment, fig. 6 is a partial schematic view of another alternative implementation of a backlight module of a display device according to an embodiment of the present disclosure. As shown in fig. 6, the first light source includes a plurality of first sub-light sources Y11, and each of the first sub-light sources Y11 includes a first blue chip D1 and a yellow phosphor S3. Optionally, the first blue light chip D1 emits short-wave blue light, the short-wave blue light can excite the yellow phosphor to emit yellow light, the short-wave blue light and the yellow light are superimposed to form white light, the first sub-light source Y11 can provide the white light, and the yellow phosphor can be any one of yellow phosphors in the prior art. The second light source comprises a plurality of second sub light sources Y22, each second sub light source Y22 comprises a second blue light chip D2, the second blue light chip D2 emits long-wave blue light, and the second blue light chip D2 directly emits the long-wave blue light without de-excitation of fluorescent powder; the first sub light sources Y11 and the second sub light sources Y22 are alternately arranged on the same side of the light guide plate 201. The first blue light chip is a short-wave blue light chip, the first blue light chip can guarantee the excitation efficiency of the yellow fluorescent powder, the brightness of the red sub-pixel and the brightness of the green sub-pixel in field-sequential display of starting of the first light source are guaranteed, and the brightness of the display is guaranteed not to be affected. Therefore, the content of short-wave blue light during display can be reduced or the blue light component during display can be eliminated in at least part of display pictures in a field sequential display mode, and the color gamut of the display can be ensured to be unaffected.

As illustrated in fig. 6, the first sub light source Y11 is integrated in the first LED lamp, and the second sub light source Y22 is integrated in the second LED lamp. That is, the first LED lamps and the second LED lamps are alternately arranged in the backlight light bar. During manufacturing, the first blue light chip is fixed on the support, optionally, the support is of a cup-shaped structure, and then yellow fluorescent powder is coated on one side of the light emitting surface of the first blue light chip to form a first LED lamp, and the first LED lamp can emit white light with short-wave blue light components. And fixing the second blue light chip on the support, and forming a second LED lamp without spot-coating fluorescent powder on the light-emitting surface of the second blue light chip, wherein the second LED lamp can emit long-wave blue light. The first LED lamp and the second LED lamp are not labeled in the drawings, and the structures of the first LED lamp and the second LED lamp can be understood by referring to the description corresponding to the embodiment in fig. 5, which is not repeated herein.

Optionally, in this embodiment of the application, a peak wavelength of the blue light emitted by the first blue light chip is 445nm to 455 nm. Therefore, in the first light source, the red and green fluorescent powder is excited by adopting the short-wave blue light to emit white light, the energy of the short-wave blue light is high, the excitation efficiency of the fluorescent powder is high, the content of red light and green light in the white light emitted by the first light source is high, and the light emitting brightness of the red sub-pixel and the green sub-pixel is ensured in the field sequential display of the first light source. Similarly, when the short-wave blue light is adopted to excite the yellow fluorescent powder to emit white light, the high content of yellow light in the white light can be ensured, and the light emitting brightness of the red sub-pixel and the green sub-pixel can be ensured in the field sequential display of the first light source. The peak wavelength of the blue light emitted by the second blue light chip is 460 nm-490 nm. In the embodiment of the application, the second blue light chip does not need to deactivate the fluorescent powder, and the second blue light chip directly emits the long-wave blue light to ensure the emergent light display of the blue sub-pixel.

Optionally, the first sub-light source and the second sub-light source are integrated in the same integrated LED lamp. Fig. 7 is a partial schematic view of another alternative implementation of a backlight module in a display device according to an embodiment of the present application, and as shown in fig. 7, a light guide plate 201 in the backlight module is shown, and an integrated LED lamp includes: the first carrier plate B1 and the second carrier plate B2, the second carrier plate B2 is fixed on the first carrier plate B1, wherein the first blue light chip D1 in the first sub-light source Y11 is fixed on the first carrier plate B1, and the second blue light chip D2 in the second sub-light source Y22 is fixed on the second carrier plate B2. In the module structure, the backlight bar is disposed at one side of the light guide plate 201, and a distance d1 from the first carrier plate B1 to the light guide plate 201 is greater than a distance d2 from the second carrier plate B2 to the light guide plate 201. In manufacturing, the second blue light chip D2 may be first soldered on the second carrier board B2, and then the first blue light chip D1 and the second carrier board B2 fixed with the second blue light chip D2 are soldered on the first carrier board B1 at the same time. And then red and green fluorescent powder formed by mixing red fluorescent powder S1 and green fluorescent powder S2 is point-coated on the first blue light chip D1 to form the integrated LED lamp. In the integrated LED lamp, the first blue chip D1 and the second blue chip D2 are independently driven, respectively. And the first blue light chip D1 and the second blue light chip D2 highly have dislocation, can prevent to cause the pollution to second blue light chip D2 when the phosphor powder is scribbled to the point, simultaneously, when driving second sub-light source Y22 alone, also can prevent that long wave blue light from arousing red green phosphor powder. During the manufacturing process, the second blue light chip D2 may or may not be dotted with the sealant.

The integrated LED lamp is also not labeled in fig. 7, and as can be understood from the above description, the integrated LED lamp includes: the first sub-light source is composed of a first bearing plate, a second bearing plate, a first blue light chip and corresponding fluorescent powder, and the second sub-light source is composed of a second blue light chip.

The design of the integrated LED lamp is adopted, lamps with uniform specifications are arranged in the backlight lamp bar, and the material management and control are facilitated in the lamp bar manufacturing process. Meanwhile, in the extending direction of the light bar, namely the arrangement direction of the integrated LED lamp, the spacing distance between the chips emitting the same spectrum is small, namely the spacing distance between two adjacent first sub-light sources is small, and the spacing distance between two adjacent second sub-light sources is small. When a plurality of sub-light sources used for emitting the same spectrum are started simultaneously in display, the spacing distance between the adjacent sub-light sources is small, the distance for color mixing of the two adjacent sub-light sources is short, and uniform color mixing of the sub-light sources in the light guide plate is facilitated, so that the first light source and the second light source can form uniform surface light sources respectively, and uniform display brightness is guaranteed.

It should be noted that the chip in fig. 7 is only schematically illustrated, the positive electrode and the negative electrode of the chip are not illustrated, and each chip actually further includes a positive electrode and a negative electrode, and the chip is controlled to emit light after voltages are applied to the positive electrode and the negative electrode, respectively. Fig. 7 is only illustrated that the first sub-light source includes the first blue light chip, and the red phosphor and the green phosphor. Optionally, in the integrated LED lamp, the first blue light chip and the yellow phosphor may also form a first sub-light source, which is not illustrated in the drawings.

In another embodiment, the first light source includes a plurality of third sub-light sources and a plurality of fourth sub-light sources, each third sub-light source includes a first blue light chip and a red phosphor, and the first blue light chip excites the red phosphor to emit red light, so that the third sub-light sources can emit a mixture of short-wave blue light and red light. Each fourth sub-light source comprises a first blue light chip and green fluorescent powder; the first blue light chip excites the green fluorescent powder to emit green light, and then the fourth sub-light source can emit mixed light of short-wave blue light and the green light. When the first light source is started, the third sub light source and the fourth sub light source are started simultaneously, so that the first light source provides white light, wherein the blue light component in the white light is short-wave blue light. The second light source comprises a plurality of second sub light sources, each second sub light source comprises a second blue light chip, the second blue light chips are long-wave blue light chips, and when the second light sources are started, the plurality of second sub light sources are started simultaneously, so that the second light sources provide long-wave blue light.

The embodiments of fig. 3 to 7 are all illustrated with a backlight module as a side-in type backlight module, and optionally, the backlight module in the display device provided by the embodiments of the present application may also be a direct-type backlight module. The direct type backlight module does not need to be provided with a light guide plate, the light source is arranged below the optical film group, and the light source provides a surface light source for the display panel after being illuminated under the action of the optical film group. Referring to the schematic diagrams in fig. 8 and fig. 9, fig. 8 is a schematic cross-sectional diagram of an alternative implementation manner of a backlight module of a display device according to an embodiment of the present application. Fig. 9 is a schematic top view of a backlight module of a display device according to an embodiment of the present disclosure.

As shown in fig. 8, for example, the first light source in the backlight module includes a plurality of first LED lamps, and the second light source includes a plurality of second LED lamps. The first sub-light source Y11 comprising a first blue light chip D1 red phosphor powder S1 and a green phosphor powder S2 is integrated in the first LED lamp, the second sub-light source Y22 comprising a second blue light chip D2 is integrated in the second LED lamp, the first blue light chip D1 is a short-wave blue light chip, and the second blue light chip D2 is a long-wave blue light chip. The bracket 30 of the LED lamp is also illustrated, but the overall LED lamp structure is not labeled. It is understood that, for the first LED lamp, the first sub light source Y11 is the first blue light chip D1 and the phosphor integrated in the LED lamp, that is, the first LED lamp includes the support 30, the first blue light chip D1 and the phosphor. For the second LED lamp, the second sub light source Y22 is the second blue light chip D2 integrated in the LED lamp, that is, the second LED lamp includes the bracket 30 and the second blue light chip D2. The manufacturing method of the first LED lamp and the second LED lamp can refer to the corresponding description of the embodiment of fig. 5. In fig. 8, the first LED lamp and the second LED lamp in the backlight module are disposed below the optical film set 202, and light emitted from the light source penetrates through the optical film set 202 to form a surface light source, so as to provide a surface light source for the display panel. The optical film assembly 202 is illustrated as including a lower diffusion sheet 2021, a prism sheet 2022, an upper diffusion sheet 2023, etc. stacked together.

As shown in fig. 9, a first LED lamp 41 and a second LED lamp 42 are simplified and shown, and the first LED lamps 41 and the second LED lamps 42 are arranged in an LED lamp array, in which all the second LED lamps 42 are adjacent to the first LED lamps 41 in the row direction or the column direction, and all the first LED lamps 41 are adjacent to the second LED lamps 42 in the row direction or the column direction, so as to ensure uniformity of a luminance surface light source in a display in which the first light sources are individually turned on (that is, all the first LED lamps 41 are turned on) or the second light sources are individually turned on (that is, all the second LED lamps 42 are turned on).

Optionally, in an embodiment of the direct-type backlight module, the first light source includes a plurality of first LED lamps, and the second light source includes a plurality of second LED lamps. The first sub-light source comprising a first blue light chip and yellow fluorescent powder is integrated in the first LED lamp, the second sub-light source comprising a second blue light chip is integrated in the second LED lamp, the first blue light chip emits short-wave blue light, and the second blue light chip emits long-wave blue light. The first LED lamp and the second LED lamp are arranged in the same manner as in fig. 9 described above, and are not illustrated here.

In another embodiment, the first sub-light source and the second sub-light source are integrated in the same integrated LED lamp, the integrated LEDs are arranged into an LED array as shown in fig. 9, and the LED lamp array is disposed below the optical film group to form a direct type backlight module. The structure of the integrated LED lamp in this embodiment can be described with reference to the embodiment of fig. 7, and is not described herein again.

An embodiment of the present application further provides a driving method of a display device, which is used to drive the display device provided in any embodiment of the present application to perform display, and fig. 10 is a schematic diagram of the driving method provided in the embodiment of the present application. As shown in fig. 10, the driving method includes: the display process of at least part of the picture comprises a first field order and a second field order, wherein,

step S101: in the first field order: controlling the first light source to be turned on, controlling the second light source to be turned off, and controlling liquid crystal molecules in each color sub-pixel to deflect to realize gray scale control of each color sub-pixel, namely controlling liquid crystal molecules in the red sub-pixel, and/or the green sub-pixel, and/or the blue sub-pixel to deflect to realize gray scale control of the red sub-pixel, and/or the green sub-pixel, and/or the blue sub-pixel; when the first light source is started, the first light source can provide white light, and the peak wavelength of a blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source. Optionally, the blue light component in the first light source is short-wave blue light. In the field sequence, red light components in white light penetrate through the red color resistor to be emitted to realize the display of the red sub-pixel, green light components in the white light penetrate through the green color resistor to be emitted to realize the display of the green sub-pixel, and short wave blue light components in the white light penetrate through the blue color resistor to be emitted to realize the display of the blue sub-pixel. Through the corresponding deflection degree of controlling liquid crystal molecules, the red, green and blue color sub-pixels can realize different gray scale display, wherein the blue color sub-pixel can realize display by emitting short wave blue light.

Step S102: in the second field sequence: and controlling the second light source to be switched on, controlling the first light source to be switched off, and controlling liquid crystal molecules in each color sub-pixel to deflect, thereby realizing gray scale control of each color sub-pixel, and simultaneously controlling the red sub-pixel and the green sub-pixel to display 0 gray scale. When the second light source is turned on, the second light source can provide blue light, and optionally, the second light source emits long-wave blue light. In the field sequence, the liquid crystal molecules are controlled to deflect, the red sub-pixel and the green sub-pixel are controlled to display 0 gray scale, and the blue sub-pixel can display different gray scales by controlling the deflection degree of the liquid crystal molecules of the blue sub-pixel. And because the green sub-pixel is controlled to display the 0 gray scale, even if the light transmitting wave bands of the green color resistor and the blue color resistor are overlapped, the long-wave blue light cannot penetrate through the green color resistor and then affects the display of the green sub-pixel, and all the red sub-pixels are controlled to display the 0 gray scale in the same way, and the long-wave blue light cannot affect the display of the red sub-pixel.

The display device comprises a display driving chip and a backlight driving chip, and when picture display is realized, the display driving chip and the backlight driving chip are required to be matched. In step S101, in the first field order: the backlight driving chip controls the first light source to be turned on and controls the second light source to be turned off, and the display driving chip controls liquid crystal molecules in each color sub-pixel to deflect through the pixel circuit, so that gray scale control of each color sub-pixel is realized. In step S102, in the second field order: the backlight driving chip controls the second light source to be turned on and controls the first light source to be turned off, and the display driving chip controls liquid crystal molecules in each color sub-pixel to deflect, so that gray scale control of each color sub-pixel is realized, wherein the display driving chip controls all red sub-pixels and all green sub-pixels to display 0 gray scale.

It should be noted that the first field sequence and the second field sequence only indicate different time periods, that is, the first light source is turned on in the first time period, the second light source is turned on in the second time period, and the first and the second do not represent the chronological order, that is, in one frame of picture display, the first light source may be turned on first, then the first light source is turned off, and the second light source is turned on. Or the second light source is turned on first, then the second light source is turned off, and the first light source is turned on again. The above steps S101 and S102 are applied to driving a color screen display including a plurality of colors, and a gray scale display of one pixel unit can be realized by performing a superposition color mixing on light emitted from the red, green, and blue sub-pixels in the first field sequence and light emitted from the blue sub-pixel in the second field sequence. And when the first field sequential display is carried out, three primary colors of red, green and short-wave blue light can be obtained; in the second-order display, the fourth primary color light of the long-wave blue light can be obtained. By adopting the driving method provided by the embodiment of the application, one pixel unit can realize different gray scale display through the mutual matching of red light, green light, short wave blue light and long wave blue light, the content of the short wave blue light during display can be reduced, the color gamut of four primary colors can be realized, and the color gamut of the display equipment is increased.

Further, in the field sequence for controlling the first light source to turn on, the method further includes: and controlling the blue color sub-pixel to display 0 gray scale. That is, in step S101, all the blue sub-pixels are controlled to display the 0 gray scale by controlling the degree of deflection of the liquid crystal molecules. In the field sequential display with the first light source turned on, all the blue sub-pixels are not displayed, and only the red and green sub-pixels can emit light for display, that is, in the field sequential display, the short-wave blue light component in the first light source cannot be emitted by the panel to contribute to the display of the picture. The gray scale display of one pixel unit can be realized by carrying out superposition color mixing on the light emitted by the red and green sub-pixels in the first field sequence and the light emitted by the blue sub-pixel in the second field sequence. And the second light source only provides long-wave blue light to realize gray scale display of the blue sub-pixel, and the driving method provided by the embodiment is adopted to display, so that short-wave blue light components can be filtered, and the short-wave blue light is not generated when the display equipment displays, thereby reducing the risk of injury to human eyes caused by long-time watching of the display equipment.

In an embodiment, the driving method provided by the embodiment of the present application further includes: when a part of single-color picture is displayed, the backlight driving chip controls only one of the first light source and the second light source to be turned on. The first light source can emit white light, the second light source can emit blue light, and the peak wavelength of a blue light component in the white light emitted by the first light source is smaller than the peak wavelength of the blue light emitted by the second light source. When a red picture is displayed, the backlight driving chip controls the first light source to be turned on and controls the second light source to be turned off, and meanwhile, the display driving chip controls the red sub-pixel in the display panel to be turned on and controls the green sub-pixel and the blue sub-pixel to display 0 gray scale, so that the red picture is displayed. When the blue picture is displayed, the backlight driving chip controls the second light source to be started and controls the first light source to be closed, and meanwhile, the display driving chip controls the blue sub-pixel in the display panel to be started and controls the green sub-pixel and the red sub-pixel to display 0 gray scale, so that the blue picture is displayed.

In another embodiment, the driving method provided in the embodiment of the present application further includes: when displaying partial single-color picture, the backlight driving chip controls the first light source in the first field sequence and controls the second light source to be started in the second field sequence. Taking red display as an example, when the first field sequential first light source is turned on, the first light source can emit white light, the display driving chip controls the red sub-pixel in the display panel to be turned on at the same time, and controls the green sub-pixel and the blue sub-pixel to display 0 gray scale, then the first light source can emit white light, only the red light component in the white light is emitted after passing through the red color resistance corresponding to the red sub-pixel, the red sub-pixel displays red, and the first field sequential display panel displays red on the whole surface. When the second field sequence second light source starts, the second light source only emits blue light, and at the moment, the blue sub-pixel display is not needed, the red sub-pixel, the green sub-pixel and the blue sub-pixel are controlled by the display driving chip to display 0 gray scale, namely, the light is not emitted from the second field sequence display panel, and only the red light emitted from the first field sequence is displayed after the light emitting of the first field sequence and the light emitting of the second field sequence are superposed and mixed. When the embodiment displays a color picture containing multiple colors and displays a single color picture, the control mode of the backlight driving chip to the light source is the same, namely the driving time sequence of the backlight driving chip to the first light source and the second light source does not need to be changed, and the backlight driving mode is simpler.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that the display device comprises:

and the backlight driving chip is used for controlling the first light source to be started in a first field sequence and controlling the second light source to be started in a second field sequence in at least partial picture display.

2. The display device according to claim 1,

the first light source comprises a plurality of first sub light sources, and the first sub light sources comprise a first blue light chip, red fluorescent powder and green fluorescent powder;

the second light source comprises a plurality of second sub light sources, and the second sub light sources comprise second blue light chips.

3. The display device according to claim 1,

the first light source comprises a plurality of first sub light sources, and each first sub light source comprises a first blue light chip and yellow fluorescent powder;

4. The display device according to claim 2 or 3,

the first sub-light source and the second sub-light source are integrated in an LED lamp;

the LED lamp includes: the light source comprises a first bearing plate and a second bearing plate, wherein the second bearing plate is fixed on the first bearing plate, the first sub-light source is fixed on the first bearing plate, and the second sub-light source is fixed on the second bearing plate.

5. The display device according to claim 2 or 3,

the first sub-light source is integrated in a first LED lamp, and the second sub-light source is integrated in a second LED lamp.

6. The display device according to any one of claims 2 to 5,

the peak wavelength of the blue light emitted by the first blue light chip is within the range of 445 nm-455 nm; the peak wavelength of the blue light emitted by the second blue light chip is in the range of 460nm to 490 nm.

7. The display device according to any one of claims 2 to 6,

the backlight module comprises a light guide plate;

the first light source and the second light source are both positioned on the same side of the light guide plate.

8. The display device according to claim 7,

the first sub light sources and the second sub light sources are alternately arranged on the same side of the light guide plate.

9. The display device according to any one of claims 1 to 8,

the liquid crystal panel comprises an array substrate, a color film substrate and a liquid crystal molecular layer, wherein the liquid crystal molecular layer is positioned between the array substrate and the color film substrate;

the color film substrate comprises a black matrix and a color resistance layer, the black matrix is provided with a plurality of openings, the color resistance layer is exposed by the openings, and the color resistance layer comprises the red color resistance, the green color resistance and the blue color resistance;

the array substrate comprises a common electrode and a plurality of pixel electrodes, the plurality of pixel electrodes comprise a first pixel electrode, a second pixel electrode and a third pixel electrode, the red sub-pixel comprises the first pixel electrode, the green sub-pixel comprises the second pixel electrode, and the blue sub-pixel comprises the third pixel electrode.

10. The display device according to any one of claims 1 to 9,

the display device further comprises a display driving chip, and the display driving chip is used for controlling liquid crystal molecules in the red sub-pixel, the green sub-pixel and/or the blue sub-pixel to deflect in a display picture so as to realize gray scale control of the red sub-pixel, the green sub-pixel and/or the blue sub-pixel.

11. A driving method of a display device for driving the display device according to any one of claims 1 to 10 to display, the driving method comprising:

in the first field order: controlling the first light source to be turned on and controlling the second light source to be turned off;

in the second field order: controlling the second light source to be turned on, and controlling the first light source to be turned off;

and in each field sequence, controlling the liquid crystal molecules in the red sub-pixel, and/or the green sub-pixel, and/or the blue sub-pixel to deflect, and realizing gray scale control on the red sub-pixel, and/or the green sub-pixel, and/or the blue sub-pixel, wherein in the second field sequence, the red sub-pixel and the green sub-pixel are controlled to display 0 gray scale.

12. The driving method according to claim 11,

the driving method further includes: and controlling the blue sub-pixel to display 0 gray scale in the first field sequence.