CN117687244A - Liquid crystal display device and driving method - Google Patents

Abstract

The invention discloses a liquid crystal display device and a driving method, wherein the liquid crystal display device comprises a backlight module and a display panel; the display panel is provided with a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the aperture ratios of the red sub-pixel and the green sub-pixel are both larger than that of the blue sub-pixel; the color film substrate of the display panel is provided with a red color resistance layer corresponding to the red sub-pixel, a green color resistance layer corresponding to the green sub-pixel and a blue color resistance layer corresponding to the blue sub-pixel; the backlight module comprises a light-emitting source, wherein the light-emitting source comprises a first light source and a second light source, the blue light intensity of the second light source is larger than that of the first light source, and the first light source and the second light source emit light synchronously. The areas of the red color resistance layer and the green color resistance layer are larger than the area of the blue color resistance layer, and the blue light intensity of the second light source is larger than that of the first light source, so that the penetration rate can be improved and the backlight power consumption can be reduced on the basis that the color saturation and the color gamut coordinates are not affected.

Description

Liquid crystal display device and driving method

Technical Field

The present invention relates to the field of display technologies, and in particular, to a liquid crystal display device and a driving method thereof.

Background

The liquid crystal display device (Liquid Crystal Display, LCD) has many advantages such as thin body, power saving, no radiation, etc., and has been widely used. Such as: liquid crystal televisions, mobile phones, personal Digital Assistants (PDAs), digital cameras, computer screens, notebook computer screens, and the like are dominant in the field of flat panel displays.

The conventional lcd panel is composed of a Color Filter substrate (CF), a thin film transistor array substrate (Thin Film Transistor Array Substrate, TFT Array Substrate), and a liquid crystal layer (Liquid Crystal Layer) filled between the two substrates. The conventional lcd device is used to implement color display by using color filters coated with color resistors such as red, green, and blue to filter monochromatic light (usually white light) provided by the backlight module. Usually, three sub-pixels with the same aperture ratio of red, green and blue are arranged to form a pixel, red light, green light and blue light with different intensities can be obtained due to the filtering property of color resistance, and a color picture is displayed by the mixed color of three primary colors of the red primary color, the green primary color and the blue primary color. However, the existing color filter has low light transmittance, so the backlight module has high power consumption.

In order to create a screen with low power consumption, high image quality and more environmental protection, the boosting is green and low-carbon, and in the prior art, the transmittance is usually improved by increasing the aperture ratio of three sub-pixels of red, green and blue, adding a brightness enhancement film (DBEF) into a backlight module, adding a reflective polarized light brightness enhancement film polarizing plate (APCF) into a liquid crystal display panel or using high-transmittance liquid crystal and high-transmittance polarizing plate. The opening ratio of the sub-pixels is improved, so that the lifting amplitude is smaller under the condition of considering the wiring space of the scanning lines and the data lines; the range of improving the transmittance through the liquid crystal and the polarizing plate material is limited; the cost and thickness are increased by matching with the brightness enhancement reflective polarizing plate or the brightness enhancement film.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a liquid crystal display device and a driving method thereof, so as to solve the problems of limited range of improving the transmittance and larger cost and thickness in the prior art.

The aim of the invention is achieved by the following technical scheme:

the invention provides a liquid crystal display device, which comprises a backlight module and a display panel arranged on the light emitting side of the backlight module;

the display panel is provided with a plurality of pixel units distributed in an array, wherein each pixel unit is provided with a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the opening ratios of the red sub-pixel and the green sub-pixel are both larger than that of the blue sub-pixel;

the display panel comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a liquid crystal layer arranged between the color film substrate and the array substrate, wherein the color film substrate is provided with a red color resistance layer in a region corresponding to the red sub-pixel, a green color resistance layer in a region corresponding to the green sub-pixel and a blue color resistance layer in a region corresponding to the blue sub-pixel, and the areas of the red color resistance layer and the green color resistance layer are both larger than the area of the blue color resistance layer;

the backlight module comprises a light emitting source, wherein the light emitting source comprises a first light source and a second light source, the blue light intensity of the second light source is larger than that of the first light source, and the first light source and the second light source emit light synchronously.

Further, the first light source is a white light source for emitting white light, and the second light source is a blue light source for emitting blue light.

Further, the first light source is a first white light source for emitting first white light, the second light source is a second white light source for emitting second white light, and the blue light specific gravity in the second white light is greater than that in the first white light.

The application also provides a liquid crystal display device, which comprises a backlight module and a display panel arranged on the light emitting side of the backlight module;

the display panel is provided with a plurality of pixel units distributed in an array, wherein each pixel unit is provided with a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the opening ratios of the red sub-pixel and the green sub-pixel are both larger than that of the blue sub-pixel;

the display panel comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a liquid crystal layer arranged between the color film substrate and the array substrate, wherein the color film substrate is provided with a red color resistance layer in a region corresponding to the red sub-pixel, a green color resistance layer in a region corresponding to the green sub-pixel and a blue quantum dot layer in a region corresponding to the blue sub-pixel, the blue quantum dot layer is used for exciting blue light, and the areas of the red color resistance layer and the green color resistance layer are both larger than the area of the blue quantum dot layer;

the backlight module comprises a light emitting source, wherein the light emitting source comprises a first light source and a second light source, the first light source is a white light source and is used for emitting white light, the second light source is an ultraviolet light source and is used for emitting ultraviolet light, and the first light source and the second light source synchronously emit light.

Further, the backlight module is a side-in type backlight module, the backlight module comprises a light guide plate, and the light emitting source is arranged on the side surface of the light guide plate;

the light-emitting source is arranged on one side of the side surface of the light guide plate; or the luminous sources are arranged on two opposite sides of the light guide plate; or the luminous sources are arranged on two adjacent sides of the light guide plate.

Further, the light guide plate is provided with a plurality of light guide net points, and the distribution density of the light guide net points gradually increases from one side of the light emitting source to one side far away from the light emitting source.

Further, the light emitting source includes a circuit board, and the first light sources and the second light sources are alternately arranged on the circuit board; or the first light source and the second light source are arranged in an overlapping manner on the circuit board.

Further, the backlight module is a direct type backlight module, the light emitting source comprises a circuit board, and the first light source and the second light source are alternately arranged in the row direction and the column direction of the circuit board.

Further, the array substrate is provided with a plurality of scanning lines, a plurality of data lines, a plurality of thin film transistors, a common electrode and a plurality of pixel electrodes, the common electrode and the pixel electrodes are mutually insulated, the scanning lines and the data lines are mutually intersected to define a plurality of pixel units, and the pixel electrodes in each pixel unit are electrically connected with the scanning lines and the data lines adjacent to the thin film transistors through the thin film transistors.

The present application also provides a driving method of a liquid crystal display device for driving the liquid crystal display device as described above, the driving method comprising:

when the liquid crystal display device is in a black state, the first light source and the second light source are simultaneously turned off;

when the liquid crystal display device is in a bright state, the first light source and the second light source are simultaneously turned on.

The invention has the beneficial effects that: through setting up red and green and hinder the area of layer and all being greater than the area that blue hinder the layer, the blue light intensity that matches the second light source again is greater than the blue light intensity of first light source, and first light source and second light source give out light in step to can promote the transmissivity on the basis that does not influence color saturation and colour gamut coordinate, reduce the backlight power consumption, reach green energy-conserving purpose.

Drawings

FIG. 1 is a schematic diagram of a liquid crystal display device in a black state according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a liquid crystal display device in a bright state according to an embodiment of the invention;

FIG. 3 is a schematic plan view of an array substrate according to a first embodiment of the present invention;

FIG. 4 is a schematic plan view of a color filter substrate according to an embodiment of the invention;

FIG. 5 is a chart showing the color resist spectrum of a red color resist layer according to an embodiment of the invention;

FIG. 6 is a diagram illustrating a color resist spectrum of a green resist layer according to a first embodiment of the present invention;

FIG. 7 is a schematic diagram of a planar structure of a backlight module according to an embodiment of the invention;

FIG. 8 is a schematic diagram of a backlight module according to a second embodiment of the invention;

FIG. 9 is a schematic plan view of a backlight module according to a second embodiment of the invention;

FIG. 10 is a schematic side view of a backlight module according to a third embodiment of the invention;

FIG. 11 is a schematic diagram of a side view of the light source of FIG. 10 from another perspective in accordance with the present invention;

FIG. 12 is a second schematic side view of a backlight module according to the third embodiment of the invention;

FIG. 13 is a schematic side view of the light source of FIG. 12 from another perspective in accordance with the present invention;

fig. 14 is a schematic view of a liquid crystal display device in a black state according to the fourth embodiment of the present invention;

FIG. 15 is a schematic diagram of a liquid crystal display device in a bright state according to a fourth embodiment of the present invention;

FIG. 16 is a schematic diagram of a liquid crystal display device in a black state according to a fifth embodiment of the present invention;

FIG. 17 is a schematic diagram of a fifth embodiment of the present invention in a bright state;

FIG. 18 is a schematic plan view of a color filter substrate according to a fifth embodiment of the present invention;

fig. 19 is a schematic plan view of a backlight module according to a fifth embodiment of the invention.

Detailed Description

In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given below of specific implementation, structure, characteristics and effects of the liquid crystal display device and driving method according to the invention with reference to the accompanying drawings and preferred embodiments:

example one

Fig. 1 is a schematic diagram of a liquid crystal display device in a black state according to a first embodiment of the present invention. Fig. 2 is a schematic diagram of a liquid crystal display device in a bright state according to a first embodiment of the invention. Fig. 3 is a schematic plan view of an array substrate according to a first embodiment of the invention. Fig. 4 is a schematic plan view of a color film substrate according to an embodiment of the invention.

As shown in fig. 1 to 4, a liquid crystal display device according to an embodiment of the invention includes a backlight module 50 and a display panel disposed on a light emitting side of the backlight module 50.

The display panel has a plurality of pixel units SP distributed in an array, and the pixel units SP have a red sub-pixel P1, a green sub-pixel P2 and a blue sub-pixel P3, and the red sub-pixel P1, the green sub-pixel P2 and the blue sub-pixel P3 are distributed in an array. The aperture ratios of the red sub-pixel P1 and the green sub-pixel P2 are larger than the aperture ratio of the blue sub-pixel P3, the aperture ratios of the red sub-pixel P1 and the green sub-pixel P2 may be the same, and the aperture ratio of the red sub-pixel P1 may be smaller than the aperture ratio of the green sub-pixel P2.

The display panel comprises a color film substrate 10, an array substrate 20 arranged opposite to the color film substrate 10, and a liquid crystal layer 30 arranged between the color film substrate 10 and the array substrate 20. In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules, and the positive liquid crystal molecules have the advantage of quick response. As shown in fig. 1, in the initial state, the positive liquid crystal molecules in the liquid crystal layer 30 take a lying posture substantially parallel to the color film substrate 10 and the array substrate 20, i.e., the long axis direction of the positive liquid crystal molecules is substantially parallel to the surfaces of the color film substrate 10 and the array substrate 20. However, in practical applications, the positive liquid crystal molecules in the liquid crystal layer 30 may have a smaller initial pretilt angle between the substrates, and the range of the initial pretilt angle may be less than or equal to 10 °, i.e.: 0-10 deg.. Alternatively, the alignment direction of the positive liquid crystal molecules near the color film substrate 10 is antiparallel to that of the positive liquid crystal molecules near the array substrate 20.

The color film substrate 10 is provided with a color resist layer 12 on a side facing the liquid crystal layer 30, and a Black Matrix (BM) 11 that spaces the color resist layer 12 apart. The color resist layer 12 has a red resist layer 121, a green resist layer 122 and a blue resist layer 123, that is, the color film substrate 10 has the red resist layer 121 in the region corresponding to the red subpixel P1, the green resist layer 122 in the region corresponding to the green subpixel P2 and the blue resist layer 123 in the region corresponding to the blue subpixel P3. Wherein, the areas of the red color resist layer 121 and the green color resist layer 122 are larger than the area of the blue color resist layer 123.

Fig. 5 is a schematic diagram of a color resistance spectrum of a red color resistance layer according to an embodiment of the invention. Fig. 6 is a schematic diagram of a color resist spectrum of a green resist layer according to a first embodiment of the invention. As shown in fig. 5 and 6, the dashed line in the figure is the spectrum of blue light, the curve R is the color resistance spectrum of the red color resistance layer, and the curve G is the color resistance spectrum of the green color resistance layer. Wherein, the transmittance of the color resistance spectrum of the red color resistance layer 121 at the spectrum intersection point of the blue light is not more than 0.038588, i.e. the transmittance of the red color resistance layer 121 to the blue light is not more than 3.8588%; the transmittance of the color resistance spectrum of the green color resistance layer 122 at the spectrum intersection of the blue light is substantially 0, that is, the transmittance of the green color resistance layer 122 to the blue light is substantially 0, thereby improving the color purity of the red sub-pixel P1 and the green sub-pixel P2.

As shown in fig. 1 to 3, a plurality of scanning lines 1, a plurality of data lines 2, a plurality of thin film transistors 3, a common electrode 21, and a plurality of pixel electrodes 22 are provided on an array substrate 20. The scanning lines 1 and the data lines 2 are mutually intersected to define a plurality of pixel units SP, each pixel unit SP is internally provided with a pixel electrode 22 and a thin film transistor 3, and the pixel electrode 22 in each pixel unit SP is electrically connected with the scanning line 1 and the data line 2 adjacent to the thin film transistor 3 through the thin film transistor 3. The common electrode 21 and the pixel electrode 22 are located at different layers and are insulated from each other, that is, the pixel electrodes 22 corresponding to the red sub-pixel P1, the green sub-pixel P2, and the blue sub-pixel P3 are all insulated from the common electrode 21, but the areas of the pixel electrodes 22 corresponding to the red sub-pixel P1 and the green sub-pixel P2 are larger than the areas of the pixel electrodes 22 corresponding to the blue sub-pixel P3. The thin film transistor 3 includes a gate electrode, an active layer, a drain electrode, and a source electrode, the gate electrode of the thin film transistor 3 and the scan line 1 are located on the same layer and electrically connected, the gate electrode and the active layer are isolated by an insulating layer, the source electrode of the thin film transistor 3 is electrically connected with the data line 2, and the drain electrode of the thin film transistor 3 and the pixel electrode 22 are electrically connected by a contact hole.

The common electrode 21 may be located above or below the pixel electrode 22 (the common electrode 21 is shown below the pixel electrode 22 in fig. 1). Preferably, the common electrode 21 is a planar electrode disposed over the entire surface, and the pixel electrode 22 is a slit electrode having a plurality of electrode bars to form a fringe field switching pattern (Fringe Field Switching, FFS). Of course, in other embodiments, the common electrode 21 may be located at the same layer as the pixel electrode 22, but the pixel electrode 22 and the common electrode 21 may each include a plurality of electrode bars, and the electrode bars of the pixel electrode 22 and the electrode bars of the common electrode 21 are alternately arranged with each other to form an In-Plane Switching (IPS). Of course, the common electrode 21 may be disposed on the color film substrate 10, so as to form a TN display mode or a VA display mode.

As shown in fig. 1, a first polarizer 41 is disposed on a side of the color film substrate 10 away from the liquid crystal layer 30, and a second polarizer 42 is disposed on a side of the array substrate 20 away from the liquid crystal layer 30, where light transmission axes of the first polarizer 41 and the second polarizer 42 are perpendicular to each other. For example, the transmission axes of the first polarizer 41 are all 0 ° and the transmission axis of the second polarizer 42 is 90 °.

The color film substrate 10 and the array substrate 20 may be made of glass, acrylic, polycarbonate, and other materials. The material of the common electrode 21 and the pixel electrode 22 may be Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) or the like.

As shown in fig. 1 and 2, the backlight module 50 includes a light emitting source 51, the light emitting source 51 includes a first light source and a second light source, and the blue light intensity of the second light source is greater than that of the first light source. Wherein the first light source and the second light source emit light synchronously.

In this embodiment, the backlight module 50 is a side-in type backlight module, the backlight module 50 includes a light guide plate 52, the light source 51 is disposed on a side surface of the light guide plate 52, and the light guide plate 52 is used for guiding light emitted by the light source 51 to convert the light from a linear light source into a surface light source.

Fig. 7 is a schematic plan view of a backlight module according to an embodiment of the invention. Fig. 8 is a schematic diagram of a second planar structure of the backlight module according to the first embodiment of the invention. As shown in fig. 7, the light emitting source 51 may be provided at one of side surfaces of the light guide plate 52. As shown in fig. 8, the light emitting sources 51 may be provided at opposite sides of the light guide plate 52, thereby increasing the intensity of light.

As shown in fig. 7 to 8, the light guide plate 52 is provided with a plurality of light guide dots 521, and the distribution density of the light guide dots 521 increases gradually from the side of the light emitting source 51 toward the side far from the light emitting source 51, so as to ensure the uniformity of the brightness of the light emitted from the light guide plate 52.

In this embodiment, the first light source is a white light source 511 for emitting white light, the second light source is a blue light source 512 for emitting blue light, and the blue light source 512 is configured to emit blue light, so that the blue light can be basically completely transmitted through the blue sub-pixel P3, and the brightness and color purity of the display panel transmitted through the blue light are not affected.

Further, the light emitting source 51 includes a circuit board 513, the first light sources and the second light sources are alternately arranged on the circuit board 513, the circuit board 513 is strip-shaped and is disposed at a side of the light guide plate 52, and the first light sources and the second light sources are alternately arranged on the circuit board 513 along a length direction thereof, so that the white light and the blue light are more uniformly mixed.

Further, the backlight module 50 includes a diffusion plate 53, the diffusion plate 53 is disposed on the light emitting surface of the light guide plate 52, and the diffusion plate 53 is used for scattering the light emitted from the light guide plate 52, so that the light is uniformly emitted to the display panel.

Law of addition of luminance:

wherein (x 1, Y1) is a chromaticity coordinate value of the first color light, the luminance of the first color light is Y1, (x 2, Y2) is a chromaticity coordinate value of the second color light, the luminance of the second color light is Y2, (x, Y) is a chromaticity coordinate value of the mixed light, and the luminance of the mixed light is Y.

For a fixed wavelength of light, the stimulus values for R (red), G (green), B (blue) and luminance are:

red subpixel area: yr (λ) = [ (y-bar) × (L-sum) × (CF-red) ]/L

Green sub-pixel region: yg (λ) = [ (y-bar) × (L-sum) × (CF-Green) ]/L

Blue sub-pixel region: yb (λ) = [ (y-bar) × (L-sum) × (CF-Blue) ]/L

Wherein, the spectrum tristimulus values are: the amount of three primary colors (R/G/B) required to match the equivalent spectral colors. The CIE1931 standard chromaticity observer spectra tristimulus values for red R, green G, and blue B were measured at x-bar, y-bar, and z-bar, respectively. L-sum: representative is BL (pl+lc), i.e., light emitted from BL (backlight unit 50) and then emitted through the display panel. CF-red, CF-Green, or CF-Blue indicates the transmittance of red, green, and Blue of CF (color filter substrate 10) at the single wavelength. λ represents the wavelength of the corresponding color light. L represents the total brightness of the outgoing light of the backlight.

From the above formula, the luminance of a single wavelength can be calculated, and from the calculus, the total luminance in the visible wavelength range 380nm to 780nm can be calculated, yr= ≡yr (λ) d, yg= ≡yg (λ) d, yb= ≡yb (λ) d, yoc = +. Yoc (λ) d, and for white light, the luminance stimulus value is yw=1/3 (yr+yg+yb).

Therefore, the requirements of different color coordinates and color gamut specifications can be satisfied by adjusting the type of RGB color resistors and the color of the light emitting source 51, and the transmittance is improved.

The present embodiment also provides a driving method of a liquid crystal display device for driving the liquid crystal display device as described above. The driving method includes:

when the liquid crystal display device is in a black state, the first light source and the second light source are turned off simultaneously, i.e. the white light source 511 and the blue light source 512 are turned off simultaneously; in the bright state of the liquid crystal display device, the first light source and the second light source are turned on simultaneously, i.e. the white light source 511 and the blue light source 512 are turned on simultaneously.

According to the embodiment, through the driving method and the liquid crystal display device, the penetration rate can be improved, the backlight power consumption can be reduced, and the purposes of green energy conservation can be achieved on the basis that the color saturation and the color gamut coordinates are not affected.

Example two

Fig. 9 is a schematic plan view of a backlight module according to a second embodiment of the invention. As shown in fig. 9, the liquid crystal display device and the driving method according to the second embodiment of the present invention are substantially the same as those of the first embodiment (fig. 1 to 8), except that in the present embodiment:

the first light source is the first white light source 511a for emitting the first white light, the second light source may be the second white light source 511b for emitting the second white light, however, the blue light specific gravity in the second white light is greater than that in the first white light, and due to the reduced aperture ratio of the blue sub-pixel P3, the blue light can basically completely penetrate the blue sub-pixel P3 by providing the second white light source 511b with a greater blue light specific gravity, so as to ensure that the brightness and color purity of the display panel penetrating the blue light are not affected. Of course, the color purity of the blue color resist layer 123 may also be improved to ensure that the brightness and color purity of the blue light are not affected.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.

Example III

Fig. 10 is a schematic side view of a backlight module according to a third embodiment of the invention. Fig. 11 is a schematic diagram of a side view of the light source of fig. 10 from another perspective in accordance with the present invention. Fig. 12 is a second schematic side view of a backlight module according to the third embodiment of the invention. Fig. 13 is a schematic diagram of a side view of the light source of fig. 12 from another perspective in accordance with the present invention. As shown in fig. 10 to 13, the liquid crystal display device and the driving method according to the third embodiment of the present invention are substantially the same as those in the first embodiment (fig. 1 to 8) and the second embodiment (fig. 9), except that in the present embodiment: the first light source and the second light source are arranged one above the other on the circuit board 513.

The first light sources and the second light sources are arranged up and down on the circuit board 513, i.e., the plurality of first light sources are arranged in one row in the length direction of the circuit board 513, and the plurality of first light sources are arranged in another row in the length direction of the circuit board 513. As shown in fig. 10 and 11, a row of first light sources, which are white light sources 511, are arranged on the upper side of a row of blue light sources 512; or as shown in fig. 12 and 13, a row of first light sources is arranged at the lower side of a row of blue light sources 512 as white light sources 511, so that the white light and the blue light are mixed more uniformly.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first and second embodiments, and will not be described herein.

Example IV

Fig. 14 is a schematic view of a liquid crystal display device in a black state according to the fourth embodiment of the present invention. Fig. 15 is a schematic view of a liquid crystal display device in a bright state according to a fourth embodiment of the present invention. As shown in fig. 14 and 15, the liquid crystal display device and the driving method according to the fourth embodiment of the present invention are substantially the same as those in the first embodiment (fig. 1 to 8) and the second embodiment (fig. 9), except that in the present embodiment:

the backlight module 50 is a direct type backlight module, the light emitting source 51 includes a circuit board 513, and the first light sources and the second light sources are alternately arranged in a row direction and a column direction of the circuit board 513. The circuit board 513 is planar and parallel to the diffusion sheet 53, and the first light sources and the second light sources are arranged in an array on the circuit board 513, and the first light sources and the second light sources are alternately arranged in a row direction and a column direction of the circuit board 513, so that white light and blue light are more uniformly mixed.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first and second embodiments, and will not be described herein.

Example five

Fig. 16 is a schematic diagram of a liquid crystal display device in a black state according to a fifth embodiment of the present invention. Fig. 17 is a schematic diagram of a liquid crystal display device in a bright state according to a fifth embodiment of the invention. Fig. 18 is a schematic plan view of a color film substrate according to a fifth embodiment of the present invention. Fig. 19 is a schematic plan view of a backlight module according to a fifth embodiment of the invention. As shown in fig. 16 to 19, the liquid crystal display device and the driving method according to the fifth embodiment of the present invention are substantially the same as those in the first embodiment (fig. 1 to 8), the second embodiment (fig. 9), the third embodiment (fig. 10 to 13), and the fourth embodiment (fig. 14 to 15), except that in the present embodiment:

the color film substrate 10 is provided with a red color resistance layer 121 in a region corresponding to the red sub-pixel P1, a green color resistance layer 122 in a region corresponding to the green sub-pixel P2, and a blue quantum dot layer 124 in a region corresponding to the blue sub-pixel P3, and the areas of the red color resistance layer 121 and the green color resistance layer 122 are larger than the area of the blue quantum dot layer 124. The blue quantum dot layer 124 is used for exciting blue light, and the blue quantum dot layer 124 can absorb light with light energy greater than blue light energy emitted by the light source, convert the light into monochromatic blue light and emit the monochromatic blue light, so that the blue light color of the blue sub-pixel P3 becomes purer.

Wherein, the Quantum Dot (QD) is usually a nanoparticle composed of II-Vl or III-V elements, the size of which is smaller than or close to the exciton Bohr radius (the diameter is not more than 10nm in general), and the Quantum Dot has obvious Quantum effect. It is generally considered a quasi-zero-dimensional material, a semiconductor nanostructure that confines conduction band electrons, valence band holes, and excitons in three spatial directions.

When the particle size of the nanomaterial drops to a certain value (typically 10nm or less), the electron energy level near the metal fermi level changes from quasi-continuous to discrete energy levels, and the energy gaps of the highest occupied molecular orbital and the lowest unoccupied molecular orbital energy levels of the discontinuous nano-semiconductor particles become wider, thereby causing absorption and blue shift of the fluorescence spectrum peak, which phenomenon is called quantum size effect.

The quantum size effect causes great change of photoelectric property of the semiconductor quantum dot, and when the size of the semiconductor quantum dot particles is smaller than the Bohr radius of excitons, the quantum size effect changes the energy level structure of the semiconductor material, so that the semiconductor material is converted from a continuous energy band structure into a discrete energy level structure with molecular characteristics. By utilizing the phenomenon, semiconductor quantum dots with different particle sizes can be prepared in the same reaction to generate light emission with different frequencies, so that various luminous colors can be conveniently regulated and controlled.

The energy of the solid absorbed photon (absorption) will be greater than the radiation photon (luminescence), so the luminescence spectrum will be shifted (red-shifted) in a direction of lower energy than the absorption spectrum, the difference in energy of the two photons being called Stokes Shift.

Because the quantum dots have narrow emission spectrum, high luminous efficiency, quantum size effect and Stokes spectrum displacement effect, the corresponding quantum dots in the sub-pixels of each color can absorb the light with energy larger than the energy of the sub-pixel unit color in the light emitted by the backlight source, and efficiently convert the absorbed light into the monochromatic light of the sub-pixel unit color and emit the monochromatic light, so that the color corresponding to the sub-pixel of the color is purer and the saturation is higher.

As shown in fig. 19, the light source 51 of the backlight module 50 includes a first light source and a second light source, which emit light synchronously. The backlight module 50 may be a side-in backlight module or a direct-down backlight module.

In this embodiment, the first light source is the white light source 511 for emitting white light, the second light source is the ultraviolet light source 514 for emitting ultraviolet light, and the blue quantum dot layer 124 can completely absorb and convert the ultraviolet light into monochromatic blue light and emit the monochromatic blue light, so that the blue light color of the blue sub-pixel P3 becomes purer, and the brightness and the color purity of the display panel penetrating the blue light are not affected.

Compared to the blue light blocking layer 123, the blue light quantum dot layer 124 is matched with ultraviolet light in the present embodiment, so that the brightness and color purity of the display panel transmitted through blue light are not affected. And because the energy of ultraviolet light is greater than that of blue light, the blue light excited by the blue quantum dot layer 124 has brighter brightness and higher color purity, so that the blue sub-pixel P3 can be made smaller, the red sub-pixel P1 and the green sub-pixel P2 can be made larger, which is more beneficial to improving the penetration rate and reducing the backlight power consumption.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first to fourth embodiments, and will not be described herein.

In this document, terms such as up, down, left, right, front, rear, etc. are defined by the positions of the structures in the drawings and the positions of the structures with respect to each other, for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the protection sought herein. It should also be understood that the terms "first" and "second," etc., as used herein, are used merely for distinguishing between names and not for limiting the number and order.

The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. The liquid crystal display device is characterized by comprising a backlight module (50) and a display panel arranged on the light emitting side of the backlight module (50);

the display panel is provided with a plurality of pixel units (SP) distributed in an array, wherein the pixel units (SP) are provided with red sub-pixels (P1), green sub-pixels (P2) and blue sub-pixels (P3), and the opening ratios of the red sub-pixels (P1) and the green sub-pixels (P2) are larger than the opening ratio of the blue sub-pixels (P3);

the display panel comprises a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10) and a liquid crystal layer (30) arranged between the color film substrate (10) and the array substrate (20), wherein the color film substrate (10) is provided with a red color resistance layer (121) in a region corresponding to a red sub-pixel (P1), a green color resistance layer (122) in a region corresponding to a green sub-pixel (P2) and a blue color resistance layer (123) in a region corresponding to a blue sub-pixel (P3), and the areas of the red color resistance layer (121) and the green color resistance layer (122) are both larger than the area of the blue color resistance layer (123);

the backlight module (50) comprises a light emitting source (51), the light emitting source (51) comprises a first light source and a second light source, the blue light intensity of the second light source is larger than that of the first light source, and the first light source and the second light source emit light synchronously.

2. The liquid crystal display device according to claim 1, wherein the first light source is a white light source (511) for emitting white light and the second light source is a blue light source (512) for emitting blue light.

3. The liquid crystal display device according to claim 1, wherein the first light source is a first white light source (511 a) for emitting a first white light, and the second light source is a second white light source (511 b) for emitting a second white light, and a blue specific gravity in the second white light is greater than a blue specific gravity in the first white light.

4. The liquid crystal display device is characterized by comprising a backlight module (50) and a display panel arranged on the light emitting side of the backlight module (50);

the display panel is provided with a plurality of pixel units (SP) distributed in an array, wherein the pixel units (SP) are provided with red sub-pixels (P1), green sub-pixels (P2) and blue sub-pixels (P3), and the opening ratios of the red sub-pixels (P1) and the green sub-pixels (P2) are larger than the opening ratio of the blue sub-pixels (P3);

the display panel comprises a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10) and a liquid crystal layer (30) arranged between the color film substrate (10) and the array substrate (20), wherein the color film substrate (10) is provided with a red color resistance layer (121) in a region corresponding to a red sub-pixel (P1), a green color resistance layer (122) in a region corresponding to a green sub-pixel (P2) and a blue quantum dot layer (124) in a region corresponding to a blue sub-pixel (P3), the blue quantum dot layer (124) is used for exciting blue light, and the areas of the red color resistance layer (121) and the green color resistance layer (122) are both larger than the area of the blue quantum dot layer (124);

the backlight module (50) comprises a light emitting source (51), the light emitting source (51) comprises a first light source and a second light source, the first light source is a white light source (511) and is used for emitting white light, the second light source is an ultraviolet light source (514) and is used for emitting ultraviolet light, and the first light source and the second light source synchronously emit light.

5. The liquid crystal display device according to any one of claims 1-4, wherein the backlight module (50) is a side-in backlight module, the backlight module (50) comprises a light guide plate (52), and the light emitting source (51) is disposed on a side surface of the light guide plate (52);

the luminous source (51) is arranged on one side surface of the light guide plate (52); or the luminous sources (51) are arranged on two opposite sides of the light guide plate (52).

6. The liquid crystal display device according to claim 5, wherein the light guide plate (52) is provided with a plurality of light guide dots (521), and the distribution density of the light guide dots (521) gradually increases from the side of the light emitting source (51) toward the side away from the light emitting source (51).

7. The liquid crystal display device according to claim 6, wherein the light-emitting source (51) includes a circuit board (513), and the first light sources and the second light sources are alternately arranged on the circuit board (513); or the first light source and the second light source are arranged in an overlapping manner on the circuit board (513).

8. The liquid crystal display device according to any one of claims 1 to 4, wherein the backlight module (50) is a direct type backlight module, the light emitting source (51) includes a circuit board (513), and the first light sources and the second light sources are alternately arranged with each other in a row direction and a column direction of the circuit board (513).

9. The liquid crystal display device according to any one of claims 1 to 4, wherein a plurality of scanning lines (1), a plurality of data lines (2), a plurality of thin film transistors (3), a common electrode (21) and a plurality of pixel electrodes (22) are disposed on the array substrate (20), the common electrode (21) and the pixel electrodes (22) are insulated from each other, a plurality of the scanning lines (1) and a plurality of the data lines (2) are mutually intersected to define a plurality of pixel units (SP), and the pixel electrodes (22) in each pixel unit (SP) are electrically connected with the scanning lines (1) and the data lines (2) adjacent to the thin film transistors (3) through the thin film transistors (3).

10. A driving method of a liquid crystal display device, characterized in that the driving method is for driving the liquid crystal display device according to any one of claims 1 to 9, the driving method comprising:

when the liquid crystal display device is in a black state, the first light source and the second light source are simultaneously turned off;

when the liquid crystal display device is in a bright state, the first light source and the second light source are simultaneously turned on.