CN113219716A - Display panel, display device and driving method - Google Patents

Display panel, display device and driving method Download PDF

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Publication number
CN113219716A
CN113219716A CN202110541577.3A CN202110541577A CN113219716A CN 113219716 A CN113219716 A CN 113219716A CN 202110541577 A CN202110541577 A CN 202110541577A CN 113219716 A CN113219716 A CN 113219716A
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liquid crystal
reflection
display panel
pixel
transmission
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CN113219716B (en
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郑会龙
房耸
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InfoVision Optoelectronics Kunshan Co Ltd
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InfoVision Optoelectronics Kunshan Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention discloses a display panel, a display device and a driving method, wherein the display panel comprises a color film substrate, an array substrate and a liquid crystal layer, a plurality of pixel units distributed in an array mode are arranged on the display panel, each pixel unit comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, a plurality of transmission areas used for transmitting backlight and a plurality of reflection areas used for reflecting external ambient light are arranged on the display panel, the transmission areas correspond to the red sub-pixels and the green sub-pixels, the reflection areas correspond to the blue sub-pixels, transmission pixel electrodes corresponding to the transmission areas and reflection pixel electrodes corresponding to the reflection areas are arranged on the array substrate, and the display panel is provided with a common electrode matched with the transmission pixel electrodes and the reflection pixel electrodes. By setting the area corresponding to the blue sub-pixel as the reflection area, the reflection area reflects the external environment light to display blue, and the blue light comes from the external environment, thereby reducing the damage of the display panel to the eyes of the user.

Description

Display panel, display device and driving method
Technical Field
The present invention relates to the field of liquid crystal display technologies, and in particular, to a display panel, a display device, and a driving method.
Background
The blue light released by the mobile phone screen is mainly short-wave high-energy blue light at the tail end of a visible spectrum, and the wavelength is between 380 and 450 nm. Research on the influence of retinal pigment shows that the cells lose activity when exposed to light with the wavelength of 410-450 nm, and the light can directly penetrate through the cornea and the crystalline lens of the eye to reach the retina, thereby inducing uncomfortable symptoms such as eye fatigue, dry eye, biological clock disorder and the like. And the blue light in the natural light can be scattered by the air because of the strong light, so the eyes can not be damaged.
Due to the great harm of blue light, mobile phone manufacturers and panel manufacturers have been working on reducing the harm of blue light in the last two years. Currently, two main methods for removing blue light are available: one is to dim the screen brightness or increase the yellow hue; and the other is to adjust the blue light wavelength of the LED backlight source. The second method is to adjust the blue wavelength of the LED backlight source, so the technology is immature and the cost is high. Therefore, at present, most manufacturers adopt the first blue light removing method, namely software blue light removing. Through a specific software algorithm, blue light emitted by the screen can be reduced. Because the existing LED display screen mostly adopts RGB three-color pixels, when the blue light is reduced, the spectrum of red and green is fused to present a color close to yellow, which is why the screen with software for removing blue light appears yellow. However, software de-blueing can only remove about 30% of the blue light, and has limited effect on vision protection; secondly, too high color temperature of the screen causes the color to be yellow, and a plurality of manufacturers darken the screen in the mode, and the superposition of the color temperature and the color temperature causes the reading experience of a user to be seriously reduced in the eye protection mode.
In addition, there are some methods for reducing blue light, such as a film of blue light, a pair of glasses for blue light, which can effectively reduce blue light, but all of them are not capable of preventing blue light in a hundred percent, and can only reduce blue light to a certain extent, and can also reduce the experience of a touch screen.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings in the prior art, the present invention provides a display panel, a display device and a driving method thereof, so as to solve the problems of poor blue light removal effect, high cost and reduced user experience of the display panel in the prior art.
The purpose of the invention is realized by the following technical scheme:
the invention provides a display panel, which comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a liquid crystal layer positioned between the color film substrate and the array substrate, wherein the display panel is provided with a plurality of pixel units distributed in an array manner, each pixel unit comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the display panel is provided with a plurality of transmission areas for transmitting backlight and a plurality of reflection areas for reflecting external ambient light, the transmission areas correspond to the red sub-pixels and the green sub-pixels, the reflection areas correspond to the blue sub-pixels, the array substrate is provided with a transmission pixel electrode corresponding to the transmission areas and a reflection pixel electrode corresponding to the reflection areas, the display panel is provided with a common electrode matched with the transmission pixel electrode and the reflection pixel electrode, and the transmission pixel electrode is used for controlling the intensity of the transmission backlight of the transmission areas, the reflective pixel electrode is used for controlling the intensity of the external ambient light reflected by the reflective area.
Furthermore, an elevating structure corresponding to the reflection area is arranged on the array substrate, the reflection pixel electrode is arranged on one side of the elevating structure facing the color film substrate, and the elevating structure is used for enabling the thickness of the liquid crystal layer corresponding to the reflection area to be half of the thickness of the liquid crystal layer corresponding to the transmission area.
Furthermore, the common electrode is located on the array substrate, a portion of the common electrode corresponding to the reflection area covers a surface of the padding structure facing the color film substrate, and the common electrode is insulated from the transmission pixel electrode and the reflection pixel electrode.
Furthermore, the common electrode is positioned on the color film substrate.
Furthermore, a padding structure corresponding to the reflection area is arranged on the color film substrate, and the padding structure is used for enabling the thickness of the liquid crystal layer corresponding to the reflection area to be half of the thickness of the liquid crystal layer corresponding to the transmission area.
Furthermore, the common electrode is located on the color film substrate, and a portion of the common electrode corresponding to the reflection area covers a surface of the padding structure facing the array substrate.
Further, the common electrode is positioned on the array substrate, and the common electrode is insulated and separated from the transmission pixel electrode and the reflection pixel electrode respectively.
Furthermore, the surface of the reflective pixel electrode facing the color film substrate is of a rough structure.
The invention also relates to a display device comprising a display panel as described above.
The present invention also provides a driving method of a display panel, for the display panel as described above, the driving method including:
the array substrate or the color film substrate is provided with a padding structure corresponding to the reflection area, and the padding structure is used for enabling the thickness of the liquid crystal layer corresponding to the reflection area to be half of the thickness of the liquid crystal layer corresponding to the transmission area;
a common voltage is applied to the common electrode, a reflection gray scale voltage is applied to the reflection pixel electrode, the common electrode and the reflection pixel electrode form a driving electric field and drive liquid crystal molecules in the liquid crystal layer corresponding to the reflection area to deflect, and the liquid crystal layer corresponding to the reflection area has a phase difference of 0-lambda/4;
and applying transmission gray scale voltage on the transmission pixel electrode, wherein the common electrode and the transmission pixel electrode form a driving electric field and drive liquid crystal molecules in the liquid crystal layer corresponding to the transmission region to deflect, so that the liquid crystal layer corresponding to the transmission region has a phase difference of 0-lambda/2.
The invention has the beneficial effects that: through setting the region that blue sub pixel corresponds to the reflection zone, the reflection zone reflects outer environment light and shows blue, and the grey scale of reflection zone blue light is controlled to rethread reflection pixel electrode, because blue light comes from outer environment, is not from the backlight to can reduce display panel to the harm of user's eyes, simple structure can reduce the cost of going blue light moreover, can not reduce user's use and experience.
Drawings
Fig. 1 is a schematic plan structure diagram of a color film substrate according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a display panel in an initial state according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a display panel in a bright state according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the reflective region of FIG. 3;
FIG. 5 is a schematic diagram of the transmissive region of FIG. 3;
FIG. 6 is a schematic structural diagram of a display panel in a dark state according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the reflective region of FIG. 6;
FIG. 8 is a schematic diagram of the transmissive region of FIG. 6;
FIG. 9 is a schematic structural diagram of a display panel in an initial state according to a second embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a display panel in a bright state according to a second embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a display panel in a dark state according to a second embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display panel in an initial state according to a third embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the display panel, the display device and the driving method according to the present invention with reference to the accompanying drawings and the preferred embodiments is as follows:
[ example one ]
Fig. 1 is a schematic plan structure diagram of a color filter substrate according to a first embodiment of the present invention, fig. 2 is a schematic structural diagram of a display panel in an initial state according to a first embodiment of the present invention, fig. 3 is a schematic structural diagram of a display panel in a bright state according to a first embodiment of the present invention, fig. 4 is a schematic principle diagram of a reflection area in fig. 3, fig. 5 is a schematic principle diagram of a transmission area in fig. 3, fig. 6 is a schematic structural diagram of a display panel in a dark state according to a first embodiment of the present invention, fig. 7 is a schematic principle diagram of a reflection area in fig. 6, and fig. 8 is a schematic principle diagram of a transmission area in fig. 6.
As shown in fig. 1 to 8, a display panel according to a first embodiment of the present invention includes a color filter substrate 10, an array substrate 20 disposed opposite to the color filter substrate 10, and a liquid crystal layer 30 located between the color filter substrate 10 and the array substrate 20.
Further, the display panel has a plurality of pixel units P distributed in an array, the pixel units P include red sub-pixels R, green sub-pixels G, and blue sub-pixels B, that is, a part of the plurality of pixel units P is the red sub-pixels R, another part is the green sub-pixels G, and the rest is the blue sub-pixels B, and substantially the number of the red sub-pixels R, the green sub-pixels G, and the blue sub-pixels B respectively accounts for 1/3 of all the pixel units P. Specifically, the array substrate 20 defines a plurality of pixel units P on a side facing the liquid crystal layer 30 by a plurality of scan lines (not shown) and a plurality of data lines (not shown) crossing each other in an insulated manner, each pixel unit P having a pixel electrode and a thin film transistor (not shown) therein, the pixel electrode being connected to the corresponding scan line and data line through the thin film transistor.
Further, the display panel is provided with a plurality of transmissive regions T for transmitting the backlight and a plurality of reflective regions F for reflecting external ambient light, the transmissive regions T corresponding to the red and green sub-pixels R and G, and the reflective regions F corresponding to the blue sub-pixel B. The array substrate 20 is provided with a transmissive pixel electrode 22 corresponding to the transmissive region T and a reflective pixel electrode 23 corresponding to the reflective region F, the transmissive pixel electrode 22 is connected to a corresponding scan line and a corresponding data line through a thin film transistor, the reflective pixel electrode 23 is connected to a corresponding scan line and a corresponding data line through a thin film transistor, the transmissive pixel electrode 22 is used for controlling the intensity of the transmissive backlight of the transmissive region T, and the reflective pixel electrode 23 is used for controlling the intensity of the reflective ambient light reflected by the reflective region F.
Further, the display panel is provided with a common electrode 13 which is mated with the transmissive pixel electrode 22 and the reflective pixel electrode 23. In this embodiment, the common electrode 13 is of a full-surface structure and is located on the color filter substrate 10, and the transmissive pixel electrode 22 and the reflective pixel electrode 23 are both block-shaped electrodes corresponding to the pixel unit P. As shown in fig. 2, in the initial state, the positive liquid crystal molecules in the liquid crystal layer 30 are in a lying posture, the alignment direction of the color film substrate 10 side is perpendicular to the alignment direction of the array substrate 20 side, that is, the liquid crystal molecules in the liquid crystal layer 30 are twisted by 90 ° from top to bottom, so as to implement the TN display mode. Of course, in other embodiments, the liquid crystal molecules in the liquid crystal layer 30 are negative liquid crystal molecules (liquid crystal molecules with negative dielectric anisotropy), and the negative liquid crystal molecules in the liquid crystal layer 30 are in a standing posture and perpendicular to the color film substrate 10 and the array substrate 20, so as to implement the VA display mode.
Furthermore, an elevated structure 21 corresponding to the reflection region F is disposed on the array substrate 20, the reflective pixel electrode 23 is disposed on a side of the elevated structure 21 facing the color filter substrate 10, and the elevated structure 21 is configured to enable a thickness of the liquid crystal layer 30 corresponding to the reflection region F to be half of a thickness of the liquid crystal layer 30 corresponding to the transmission region T, so that the liquid crystal layer 30 corresponding to the reflection region F is equivalent to a quarter-wave plate and has a phase difference of λ/4 when the blue subpixel B is in a dark state.
Further, the surface of the reflective pixel electrode 23 facing the color filter substrate 10 is a rough structure. Specifically, the surface of the padding structure 21 facing the color filter substrate 10 is configured to be an uneven structure, so that when the reflective pixel electrode 23 covers the surface of the padding structure 21 facing the color filter substrate 10, the surface of the reflective pixel electrode 23 facing the color filter substrate 10 forms a rough structure, so as to implement diffuse reflection.
The color filter substrate 10 is provided with a black matrix 11 and a color resistance material layer 12, and the color resistance material layer 12 includes color resistance materials of three colors of red (R), green (G), and blue (B), and a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B are correspondingly formed. The black matrices 11 correspond to scan lines and data lines on the array substrate 20, and the color resistance material layers 12 are spaced apart from each other by the black matrices 11.
Furthermore, the color filter substrate 10 is provided with a first polarizer 41 on a side away from the liquid crystal layer 30, the array substrate 20 is provided with a second polarizer 42 on a side away from the liquid crystal layer 30, and transmission axes of the first polarizer 41 and the second polarizer 42 are perpendicular to each other.
The color film substrate 10 and the array substrate 20 may be made of glass, acrylic acid, polycarbonate, and other materials. The common electrode 13 and the transmissive pixel electrode 22 may be made of Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), and the reflective pixel electrode 23 is made of a metal material having a relatively good reflectivity, such as Mo, Al, or Ag.
The present embodiment also provides a driving method of a display panel, for the display panel as described above, the driving method including:
as shown in fig. 3, in the bright state (highest gray level), a common voltage is applied to the common electrode 13, a maximum reflection gray level voltage is applied to the reflection pixel electrode 23, and no transmission gray level voltage or a minimum transmission gray level voltage is applied to the transmission pixel electrode 22. At this time, the common electrode 13 and the reflective pixel electrode 23 form a vertical driving electric field and drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflective region F to deflect, so that the liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflective region F are deflected to be perpendicular to the color filter substrate 10 and the array substrate 20, thereby making the reflective region F in a bright state. Substantially no driving electric field is formed between the common electrode 13 and the transmissive pixel electrode 22, and liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmissive region T are substantially not deflected and maintain an initial state, so that the transmissive region T is in a bright state, i.e., in the initial state, the transmissive region T is in a normally white state.
As shown in fig. 4, for the reflection area F, the external environment light I passes through the first polarizer 41 to form a linearly polarized light parallel to the transmission axis of the first polarizer 41, at this time, there is no phase retardation in the liquid crystal layer 30 corresponding to the reflection area F, the linearly polarized light passes through the liquid crystal layer 30 without phase deflection, remains as the linearly polarized light after passing through the reflective pixel electrode 23, passes through the liquid crystal layer 30 again and is emitted from the first polarizer 41, so that the reflection area F is in a bright state, and the corresponding blue subpixel B is in a bright state. As shown in fig. 5, for the transmissive region T, the light BL of the backlight passes through the second polarizer 42 to form linearly polarized light parallel to the transmission axis of the second polarizer 42, and passes through the liquid crystal layer 30 with the phase retardation of λ/2 to be linearly polarized, but the linear polarization direction is rotated by 90 °, i.e., perpendicular to the transmission axis of the second polarizer 42, and then exits from the first polarizer 41, so that the transmissive region T is in a bright state, and the corresponding red and green sub-pixels R and G are in a bright state. So that the red light and the green light adopt the light rays BL of the backlight source, and the blue light comes from the reflected external environment light I, thereby reducing the damage of the display panel to the eyes of the user.
As shown in fig. 6, in the dark state (minimum gray scale), a common voltage is applied to the common electrode 13, a reflection gray scale voltage is not applied to the reflection pixel electrode 23 or a minimum reflection gray scale voltage is applied thereto, and a maximum transmission gray scale voltage is applied to the transmission pixel electrode 22. At this time, a driving electric field is not substantially formed between the common electrode 13 and the reflective pixel electrode 23, and liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflective region F are not substantially deflected and maintain an initial state, so that the reflective region F is in a dark state, i.e., in the initial state, the reflective region F is in a normally black state. The common electrode 13 and the transmission pixel electrode 22 form a vertical driving electric field and drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmission region T to deflect, so that the liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflection region F are deflected to be perpendicular to the color film substrate 10 and the array substrate 20, and the transmission region T is in a dark state.
As shown in fig. 7, for the reflection area F, the external environment light I passes through the first polarizer 41 to form a linearly polarized light parallel to the transmission axis of the first polarizer 41, at this time, the liquid crystal layer 30 corresponding to the reflection area F has a phase retardation of λ/4, the linearly polarized light passes through the liquid crystal layer 30 to become a circularly polarized light (the polarization direction of the circularly polarized light is positive), and passes through the reflection pixel electrode 23 to remain a circularly polarized light (the polarization direction of the circularly polarized light is negative), but the polarization direction is opposite, and passes through the liquid crystal layer 30 again to become a linearly polarized light perpendicular to the transmission axis of the first polarizer 41 and is absorbed by the first polarizer 41, so that the reflection area F is in a dark state, and the corresponding blue subpixel B is in a dark state. As shown in fig. 8, for the transmissive region T, the light BL of the backlight passes through the second polarizer 42 to form linearly polarized light parallel to the transmission axis of the second polarizer 42, and at this time, the liquid crystal layer 30 has no phase retardation, and passes through the liquid crystal layer 30 and is linearly polarized light in the same direction as before, i.e. perpendicular to the transmission axis of the first polarizer 41, and then is absorbed by the first polarizer 41, so that the transmissive region T is in a dark state, and the corresponding red subpixel R and green subpixel G are in a dark state.
The formula of the effective phase retardation of the liquid crystal layer 30 is:
Figure BDA0003071800850000081
wherein theta is the included angle between the polarization light propagation direction and the liquid crystal optical axis direction, and neIs an extraordinary refractive index, n0Refractive index of normal light, Δ neffFor effective birefringence, d is the cell thickness.
From the above formula, the liquid crystal thickness can be changed, when the conventional liquid crystal display panel is in a bright state, the effective phase retardation corresponding to the conventional liquid crystal layer thickness is λ/2, and the thickness of the reflective region F corresponding to the liquid crystal layer 30 is half of the thickness of the transmissive region T corresponding to the liquid crystal layer 30, and the thickness of the liquid crystal layer 30 corresponding to the transmissive region T is the same as the conventional thickness, so that the effective phase retardation corresponding to the liquid crystal layer 30 in the reflective region F is λ/4. Of course, when the liquid crystal cell is thick for a certain period, the deflection angle of the positive liquid crystal molecules can be changed by applying a predetermined voltage to the common electrode 13 and the reflective pixel electrode 23, and when the deflection angle reaches a certain value, the effective phase retardation of the reflective region F corresponding to the liquid crystal layer 30 can be made to be λ/4.
Further, when a normal picture is displayed, a common voltage is applied to the common electrode 13, a reflection gray scale voltage (for example, 0-255 gray scale voltage) is applied to the reflection pixel electrode 23, the common electrode 13 and the reflection pixel electrode 23 form a driving electric field and drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflection area F to deflect, so that the liquid crystal layer 30 corresponding to the reflection area F has a phase difference of 0- λ/4, and thus, the gray scale of the blue sub-pixel B can be controlled; when a transmission gray scale voltage (for example, a gray scale voltage of 0 to 255) is applied to the transmission pixel electrode 22, the common electrode 13 and the transmission pixel electrode 22 form a driving electric field to drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmission region T to deflect, so that the liquid crystal layer 30 corresponding to the transmission region T has a phase difference of 0 to λ/2, thereby controlling gray scales of the red sub-pixel R and the green sub-pixel G.
Furthermore, the display panel is further provided with an optical sensor, and the optical sensor is used for detecting the intensity of the external environment light, so that the intensity of the light rays BL in the backlight source is adjusted according to the intensity of the external environment light, and the intensity of the light rays BL in the backlight source is the same as or close to the intensity of the external environment light.
[ example two ]
Fig. 9 is a schematic structural diagram of a display panel in an initial state according to a second embodiment of the present invention, fig. 10 is a schematic structural diagram of a display panel in a bright state according to the second embodiment of the present invention, and fig. 11 is a schematic structural diagram of a display panel in a dark state according to the second embodiment of the present invention. As shown in fig. 8-11, the display panel according to the second embodiment of the present invention is substantially the same as the display panel according to the first embodiment (fig. 1 to 8), except that in this embodiment, the common electrode 13 is a whole-surface structure and is disposed on the array substrate 20, and the transmissive pixel electrode 22 and the reflective pixel electrode 23 are both comb-shaped electrodes corresponding to the pixel units P. The part of the common electrode 13 corresponding to the reflection region F covers the surface of the padding structure 21 facing the color filter substrate 10, and the common electrode 13 is respectively located at different layers from the transmission pixel electrode 22 and the reflection pixel electrode 23 and insulated from each other.
In this embodiment, positive liquid crystal molecules, that is, liquid crystal molecules having positive dielectric anisotropy, are used in the liquid crystal layer 30, and in an initial state, the positive liquid crystal molecules in the liquid crystal layer 30 are aligned parallel to the color filter substrate 10 and the array substrate 20, and the alignment directions of the positive liquid crystal molecules near the color filter substrate 10 and the positive liquid crystal molecules near the array substrate 20 are parallel or antiparallel.
Here, the common electrode 13 may be located above or below the transmissive pixel electrode 22 and the reflective pixel electrode 23 (the common electrode 13 is located below the transmissive pixel electrode 22 and the reflective pixel electrode 23 in fig. 1). Preferably, the common electrode 13 is a planar electrode disposed over the entire surface, and the transmissive pixel electrode 22 and the reflective pixel electrode 23 are block electrodes disposed in one block in each pixel unit P or slit electrodes having a plurality of electrode bars to form a Fringe Field Switching (FFS) mode. Of course, In other embodiments, the transmissive pixel electrode 22 and the reflective pixel electrode 23 may be located on the same layer as the common electrode 13, but they are insulated and isolated from each other, the transmissive pixel electrode 22, the reflective pixel electrode 23, and the common electrode 13 may each include a plurality of electrode stripes, and the electrode stripes of the transmissive pixel electrode 22 and the reflective pixel electrode 23 and the electrode stripes of the common electrode 13 are alternately arranged with each other to form an In-Plane Switching (IPS) mode.
The present embodiment also provides a driving method of a display panel, for the display panel as described above, the driving method including:
as shown in fig. 10, in the bright state (highest gray scale), the common voltage is applied to the common electrode 13, the reflection gray scale voltage is not applied to the reflection pixel electrode 23 or the minimum reflection gray scale voltage is applied thereto, and the maximum transmission gray scale voltage is applied to the transmission pixel electrode 22. At this time, substantially no driving electric field is formed between the common electrode 13 and the reflective pixel electrode 23, and liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflective region F are substantially not deflected and maintain an initial state, so that the reflective region F is in a bright state, i.e., in the initial state, the reflective region F is in a normally white state. The common electrode 13 and the transmission pixel electrode 22 form a horizontal driving electric field and drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmission region T to deflect in the horizontal direction, so that the transmission region T is in a bright state.
Referring to fig. 4, for the reflection region F, the external ambient light I passes through the first polarizer 41 to form linearly polarized light parallel to the transmission axis of the first polarizer 41, at this time, the liquid crystal layer 30 corresponding to the reflection region F has no phase retardation, the linearly polarized light does not undergo phase deflection after passing through the liquid crystal layer 30, and is still linearly polarized light after passing through the reflective pixel electrode 23, and passes through the liquid crystal layer 30 again and is emitted from the first polarizer 41, so that the reflection region F is in a bright state, and the corresponding blue subpixel B is in a bright state. Referring to fig. 5, for the transmissive region T, the light BL of the backlight passes through the second polarizer 42 to form linearly polarized light parallel to the transmission axis of the second polarizer 42, and passes through the liquid crystal layer 30 with the phase retardation of λ/2 to be linearly polarized, but the linear polarization direction is rotated by 90 °, i.e., perpendicular to the transmission axis of the second polarizer 42, and then exits from the first polarizer 41, so that the transmissive region T is in a bright state, and the corresponding red and green sub-pixels R and G are in a bright state. So that the red light and the green light adopt the light rays BL of the backlight source, and the blue light comes from the reflected external environment light I, thereby reducing the damage of the display panel to the eyes of the user.
As shown in fig. 11, in the dark state (minimum gray level), a common voltage is applied to the common electrode 13, a maximum reflection gray level voltage is applied to the reflection pixel electrode 23, and no transmission gray level voltage or a minimum transmission gray level voltage is applied to the transmission pixel electrode 22. At this time, the common electrode 13 and the reflective pixel electrode 23 form a horizontal driving electric field and drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflective region F to be deflected in a horizontal direction, thereby making the reflective region F in a dark state. Substantially no driving electric field is formed between the common electrode 13 and the transmissive pixel electrode 22, and liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmissive region T are substantially not deflected and maintain an initial state, so that the transmissive region T is in a dark state, i.e., a normally black state in the initial state.
Referring to fig. 7, for the reflection region F, the external environment light I passes through the first polarizer 41 to form a linearly polarized light parallel to the transmission axis of the first polarizer 41, at this time, the liquid crystal layer 30 corresponding to the reflection region F has a phase retardation of λ/4, the linearly polarized light passes through the liquid crystal layer 30 to become a circularly polarized light (the polarization direction of the circularly polarized light is positive rotation), and passes through the reflection pixel electrode 23 to remain a circularly polarized light (the polarization direction of the circularly polarized light is negative rotation), but the polarization direction is opposite, and passes through the liquid crystal layer 30 again to become a linearly polarized light perpendicular to the transmission axis of the first polarizer 41 and is absorbed by the first polarizer 41, so that the reflection region F is in a dark state, and the corresponding blue subpixel B is in a dark state. Referring to fig. 8, for the transmissive region T, the light BL of the backlight passes through the second polarizer 42 to form linearly polarized light parallel to the transmission axis of the second polarizer 42, and at this time, the liquid crystal layer 30 has no phase retardation, and passes through the liquid crystal layer 30 and is linearly polarized light in the same direction as before, that is, perpendicular to the transmission axis of the first polarizer 41, and then is absorbed by the first polarizer 41, so that the transmissive region T is in a dark state, and the corresponding red subpixel R and green subpixel G are in a dark state.
Further, when a normal picture is displayed, a common voltage is applied to the common electrode 13, a reflection gray scale voltage (for example, 0-255 gray scale voltage) is applied to the reflection pixel electrode 23, the common electrode 13 and the reflection pixel electrode 23 form a driving electric field and drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflection area F to deflect, so that the liquid crystal layer 30 corresponding to the reflection area F has a phase difference of 0- λ/4, and thus, the gray scale of the blue sub-pixel B can be controlled; when a transmission gray scale voltage (for example, a gray scale voltage of 0 to 255) is applied to the transmission pixel electrode 22, the common electrode 13 and the transmission pixel electrode 22 form a driving electric field to drive liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmission region T to deflect, so that the liquid crystal layer 30 corresponding to the transmission region T has a phase difference of 0 to λ/2, thereby controlling gray scales of the red sub-pixel R and the green sub-pixel G.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
[ third example ]
Fig. 12 is a schematic structural diagram of a display panel in an initial state according to a third embodiment of the present invention. As shown in fig. 12, a display panel provided in the third embodiment of the present invention is substantially the same as the display panel in the first embodiment (fig. 1 to 8), except that in the present embodiment, a padding structure 21 corresponding to a reflective area F is disposed on a color film substrate 10, and the padding structure 21 is used to make a thickness of a reflective area F corresponding to a liquid crystal layer 30 half a thickness of a transmissive area T corresponding to the liquid crystal layer 30, so that when a blue sub-pixel B is in a dark state, the liquid crystal layer 30 corresponding to the reflective area F is equivalent to a quarter-wave plate and has a phase difference of λ/4.
In this embodiment, the common electrode 13 is of a full-surface structure and is located on the color filter substrate 10, and the transmissive pixel electrode 22 and the reflective pixel electrode 23 are both block-shaped electrodes corresponding to the pixel unit P. The portion of the common electrode 13 corresponding to the reflection region F covers the surface of the elevated structure 21 facing the array substrate 20. Of course, in other embodiments, the common electrode 13 may also be located on the array substrate 20, and the common electrode 13 is insulated and spaced apart from the transmissive pixel electrode 22 and the reflective pixel electrode 23, respectively.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
The invention also provides a display device comprising the display panel.
In this document, the terms of upper, lower, left, right, front, rear and the like are used to define the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the sake of clarity and convenience in technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A display panel is characterized by comprising a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10) and a liquid crystal layer (30) positioned between the color film substrate (10) and the array substrate (20), wherein the display panel is provided with a plurality of pixel units (P) distributed in an array manner, each pixel unit (P) comprises a red sub-pixel (R), a green sub-pixel (G) and a blue sub-pixel (B), the display panel is provided with a plurality of transmission regions (T) used for transmitting backlight and a plurality of reflection regions (F) used for reflecting external ambient light, the transmission regions (T) correspond to the red sub-pixel (R) and the green sub-pixel (G), the reflection regions (F) correspond to the blue sub-pixel (B), the array substrate (20) is provided with transmission pixel electrodes (22) corresponding to the transmission regions (T) and reflection pixel electrodes (23) corresponding to the reflection regions (F), the display panel is provided with a common electrode (13) which is matched with the transmission pixel electrode (22) and the reflection pixel electrode (23), the transmission pixel electrode (22) is used for controlling the intensity of the transmission backlight of the transmission area (T), and the reflection pixel electrode (23) is used for controlling the intensity of the reflection external environment light of the reflection area (F).
2. The display panel according to claim 1, wherein the array substrate (20) is provided with a padding structure (21) corresponding to the reflective region (F), the reflective pixel electrode (23) is disposed on a side of the padding structure (21) facing the color filter substrate (10), and the padding structure (21) is configured to enable a thickness of the liquid crystal layer (30) corresponding to the reflective region (F) to be half a thickness of the liquid crystal layer (30) corresponding to the transmissive region (T).
3. The display panel according to claim 2, wherein the common electrode (13) is disposed on the array substrate (20), a portion of the common electrode (13) corresponding to the reflective region (F) covers a surface of the padding structure (21) facing the color filter substrate (10), and the common electrode (13) is insulated from the transmissive pixel electrode (22) and the reflective pixel electrode (23), respectively.
4. The display panel according to claim 2, wherein the common electrode (13) is located on the color filter substrate (10).
5. The display panel according to claim 1, wherein a padding structure (21) corresponding to the reflective region (F) is disposed on the color filter substrate (10), and the padding structure (21) is used to make the thickness of the liquid crystal layer (30) corresponding to the reflective region (F) half the thickness of the liquid crystal layer (30) corresponding to the transmissive region (T).
6. The display panel according to claim 5, wherein the common electrode (13) is disposed on the color filter substrate (10), and a portion of the common electrode (13) corresponding to the reflective region (F) covers a surface of the elevated structure (21) facing the array substrate (20).
7. The display panel according to claim 5, wherein the common electrode (13) is disposed on the array substrate (20), and the common electrode (13) is insulated and spaced apart from the transmissive pixel electrode (22) and the reflective pixel electrode (23), respectively.
8. The display panel according to claim 1, wherein the surface of the reflective pixel electrode (23) facing the color filter substrate (10) is rough.
9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
10. A driving method for a display panel according to any one of claims 1 to 8, comprising:
the array substrate (20) or the color film substrate (10) is provided with a padding structure (21) corresponding to the reflection area (F), and the padding structure (21) is used for enabling the thickness of the liquid crystal layer (30) corresponding to the reflection area (F) to be half of the thickness of the liquid crystal layer (30) corresponding to the transmission area (T);
a common voltage is applied to the common electrode (13), a reflection gray scale voltage is applied to the reflection pixel electrode (23), the common electrode (13) and the reflection pixel electrode (23) form a driving electric field and drive liquid crystal molecules in the liquid crystal layer (30) corresponding to the reflection area (F) to deflect, and the liquid crystal layer (30) corresponding to the reflection area (F) has a phase difference of 0-lambda/4;
transmission gray scale voltage is applied to the transmission pixel electrode (22), the common electrode (13) and the transmission pixel electrode (22) form a driving electric field and drive liquid crystal molecules in the liquid crystal layer (30) corresponding to the transmission region (T) to deflect, and the liquid crystal layer (30) corresponding to the transmission region (T) has a phase difference of 0-lambda/2.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203204275U (en) * 2013-04-28 2013-09-18 京东方科技集团股份有限公司 Semi-transmission and semi-reflection type liquid crystal display panel, display device and array substrate
CN110426886A (en) * 2019-07-22 2019-11-08 昆山龙腾光电有限公司 Liquid crystal display panel and its driving method and liquid crystal display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203204275U (en) * 2013-04-28 2013-09-18 京东方科技集团股份有限公司 Semi-transmission and semi-reflection type liquid crystal display panel, display device and array substrate
CN110426886A (en) * 2019-07-22 2019-11-08 昆山龙腾光电有限公司 Liquid crystal display panel and its driving method and liquid crystal display device

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