CN112558367A - Display screen, driving method thereof and display device - Google Patents
Display screen, driving method thereof and display device Download PDFInfo
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- CN112558367A CN112558367A CN202011214639.1A CN202011214639A CN112558367A CN 112558367 A CN112558367 A CN 112558367A CN 202011214639 A CN202011214639 A CN 202011214639A CN 112558367 A CN112558367 A CN 112558367A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 275
- 239000000758 substrate Substances 0.000 claims description 43
- 239000011521 glass Substances 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000975 dye Substances 0.000 description 46
- 230000010287 polarization Effects 0.000 description 21
- 238000010586 diagram Methods 0.000 description 15
- 238000002834 transmittance Methods 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 210000002858 crystal cell Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
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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
- G02F1/133528—Polarisers
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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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F1/13475—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which at least one liquid crystal cell or layer is doped with a pleochroic dye, e.g. GH-LC cell
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- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
The application discloses a display screen, a driving method thereof and a display device, wherein the display screen comprises a first liquid crystal panel, a second liquid crystal panel and a polaroid, the second liquid crystal panel and the first liquid crystal panel are stacked, and the liquid crystal inside the second liquid crystal panel is doped with a two-way dye; the number of the polaroids is not more than two, and the polaroids are respectively arranged on two sides of the first liquid crystal panel and the second liquid crystal panel and/or between the first liquid crystal panel and the second liquid crystal panel. The display screen is formed by stacking two panels, and has the effect of improving the contrast; in addition, the dye in the second liquid crystal panel is a dichroic dye, and the second liquid crystal panel can be used as an electric control type polarizer, so that the requirement on the polarizer can be reduced, and the product cost is reduced.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display screen, a driving method thereof, and a display device.
Background
A Liquid Crystal Display (LCD) is a mainstream Display at present, and with the change of the market, the Liquid Crystal Display faces the threat of self-luminous displays such as Organic Light-Emitting diodes (OLEDs) or micro-LEDs, the Liquid Crystal Display does not self-emit Light, but relies on a backlight module to provide a Light source, the Liquid Crystal Display itself is only responsible for controlling the penetration of Light, and compared with the self-luminous displays such as OLEDs, the dark state of the Liquid Crystal Display still has a small amount of Light penetration to affect the contrast ratio. In order to improve the contrast ratio of the LCD, a local dimming (local dimming) technique is usually adopted, the brightness of the backlight light source is actively dimmed to improve the contrast ratio of the LCD corresponding to a dark picture, but the number of LEDs of the backlight source is limited, so when the brightness of the light source is adjusted, each brightness adjustment area covers a plurality of pixels at the same time, although the contrast ratio can be increased corresponding to a full black picture, the backlight source cannot be adjusted corresponding to the pixels in the same display area corresponding to a picture with large brightness difference in the same display area, such as a firework image. In recent years, manufacturers have proposed a screen-stacking scheme using two liquid crystal panels with the same size stacked one on top of another to achieve one-to-one pixel or one-to-many backlight adjustment, wherein the upper panel is used for normal lcd operation, and the lower panel is used for adjusting and controlling the light intensity; for example, the top panel is UHD panel (full high definition, resolution 3840 x 2160) and the bottom panel is FHD panel (high definition, resolution 1920 x 1080).
However, the current stacked display device needs three polarizers, which greatly increases the cost of the stacked display device.
Disclosure of Invention
The application aims to provide a display screen, a driving method thereof and a display device, which can improve the contrast of the display screen, reduce the number of polarizers in the display screen of a stacked screen and reduce the cost of products.
The application discloses a display screen, which comprises a first liquid crystal panel, a second liquid crystal panel and a polaroid, wherein the second liquid crystal panel and the first liquid crystal panel are stacked, and the liquid crystal inside the second liquid crystal panel is doped with a two-way dye; the polaroid is arranged at the outer sides of the first liquid crystal panel and the second liquid crystal panel and/or between the first liquid crystal panel and the second liquid crystal panel; when the polaroid is arranged on the outer sides of the first liquid crystal panel and the second liquid crystal panel, the polaroid is connected with the first liquid crystal panel and/or the second liquid crystal panel; when the polarizer is arranged between the first liquid crystal panel and the second liquid crystal panel, the upper surface and the lower surface of the polarizer are respectively connected with the first liquid crystal panel and the second liquid crystal panel; wherein the number of the polarizers is not more than two.
Optionally, the number of the polarizer is two, and one polarizer is arranged on the light incident surface or the light emergent surface of the display screen and connected with the outer side of the first liquid crystal panel or the outer side of the second liquid crystal panel; the other polaroid is arranged between the first liquid crystal panel and the second liquid crystal panel, and the upper surface and the lower surface of the polaroid are respectively connected with the first liquid crystal panel and the second liquid crystal panel.
Optionally, the number of the polaroids is two, and the two polaroids are respectively arranged on the light incident surface and the light emergent surface of the display screen and respectively connected with the outer sides of the first liquid crystal panel and the second liquid crystal panel.
Optionally, the number of the polarizers is one, and the polarizers are arranged on the light incident surface or the light emergent surface of the display screen and connected with the outer side of the first liquid crystal panel or the outer side of the second liquid crystal panel.
Optionally, the resolution of the first liquid crystal panel or the second liquid crystal panel on the light emitting surface of the display screen is greater than the resolution of the second liquid crystal panel or the first liquid crystal panel on the light incident surface of the display screen.
Optionally, the first liquid crystal panel includes a first substrate and a second substrate which are arranged in an opposite manner, the second liquid crystal panel includes a third substrate and a fourth substrate which are arranged in an opposite manner, and the first substrate, the second substrate, the third substrate and the fourth substrate are all glass substrates.
Optionally, the first liquid crystal panel and the second liquid crystal panel are connected by an optical adhesive.
Optionally, the polarizer is connected to the first liquid crystal panel or the second liquid crystal panel through a pressure sensitive adhesive.
The application also discloses a driving method of the display screen, the display screen comprises a first liquid crystal panel and a second liquid crystal panel which are stacked, the liquid crystal of the second liquid crystal panel is doped with a dichroic dye, and when the picture displayed by the display screen is in a bright state, the driving method comprises the following steps:
controlling the dye molecules in the second liquid crystal panel to be vertical to incident light; and
controlling pixels in the first liquid crystal panel to be in a high gray scale;
when the picture displayed by the display screen is in a dark state, the driving method comprises the following steps:
controlling the dye molecules in the second liquid crystal panel to be parallel to incident light; and
and controlling the pixels in the first liquid crystal panel to be in low gray scale.
The application also discloses a display device, include as above the display screen with for the display screen provides the backlight unit of light source.
Compared with the scheme that two common liquid crystal panels are stacked to improve the contrast of the display screen, the display screen is formed by stacking the first liquid crystal panel and the second liquid crystal panel, and the effect of improving the contrast is achieved; in addition, the dye in the second liquid crystal panel is the dichroic dye, the display panel of the dichroic dye liquid crystal can be used as an electric control type polarizer, and the incident light polarization state of the display panel of the dichroic dye liquid crystal does not need to be controlled additionally, so that the display screen in the application can reduce the requirement on the polarizer.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view of a stacked screen display apparatus;
FIG. 2 is a schematic view of a display screen of an embodiment of the present application;
FIG. 3 is a schematic view of a first liquid crystal panel;
FIG. 4 is a schematic view of a second liquid crystal panel;
FIG. 5 is a schematic diagram of the operation of a dye-doped liquid crystal in a second liquid crystal panel in a dark state;
FIG. 6 is a schematic diagram of the working principle of the dye-doped liquid crystal in the bright state in the second liquid crystal panel;
FIG. 7 is a schematic diagram illustrating the operation of a display screen in a dark state and a bright state according to an embodiment of the present application;
FIG. 8 is a schematic diagram of the operation of a display screen in a dark state and a light state according to another embodiment of the present application;
FIG. 9 is a schematic view of a viewing angle in a display panel with a polarizer between a first liquid crystal panel and a second liquid crystal panel;
FIG. 10 is a schematic view of a viewing angle in a display panel without a polarizer between a first liquid crystal panel and a second liquid crystal panel;
FIG. 11 is a schematic diagram of the operation of a display screen in a dark state and a light state according to another embodiment of the present application;
FIG. 12 is a schematic diagram of the operation of a liquid crystal panel in dark and bright states;
fig. 13 is a schematic diagram of a display device according to another embodiment of the present application.
100, a display device; 200. a display screen; 210. a first liquid crystal panel; 211. a first substrate; 212. a second substrate; 213. a liquid crystal layer; 220. a second liquid crystal panel; 221. a third substrate; 222. a fourth substrate; 223. doping the liquid crystal layer; 230. a polarizer; 260. a backlight module; 270. a first display panel; 280. and a second display panel.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
As shown in fig. 1, the display device is a schematic diagram of a stacked display device, the stacked display device is formed by stacking two display panels, a light source is emitted from a lower portion of a first display panel 270, a liquid crystal screen of the first display panel 270 controls intensity of the light source corresponding to each pixel, and when a pixel corresponding to a second display panel 280 is a high gray scale, the first display panel 270 controls the corresponding pixel to be also corresponding to the high gray scale so that light can penetrate through the pixel; on the contrary, when the corresponding pixel of the second display panel 280 is at a low gray level, the first display panel 270 controls the corresponding pixel to be at the low gray level to allow light to pass through. Specifically, the first display panel 270 and the second display panel 280 may be liquid crystal panels, and the liquid crystal panels control the deflection of liquid crystal molecules through an electric field, so that the intensity of light passing through the liquid crystal layer 213 is changed, thereby obtaining pixels with different brightness. In fig. 1, the final dark-state brightness of the stacked display device is formed by mixing the dark states of the first display panel 270 and the second display panel 280, and the final bright-state brightness of the stacked display device is also formed by mixing the bright states of the first display panel 270 and the second display panel 280, so as to achieve a contrast comparable to that of a self-luminous display.
The present application is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 2, as an embodiment of the present application, a display screen 200 is disclosed, in comparison with the stacking of two common display panels in fig. 1, the display screen 200 in the present application is formed by stacking a first liquid crystal panel 210 and a second liquid crystal panel 220 in which a dichroic dye is doped in a liquid crystal, and the second liquid crystal panel 220 and the first liquid crystal panel 210 also set corresponding pixels to a high gray scale or a low gray scale together, so as to obtain a bright state and a dark state in the display screen 200, which are formed by mixing gray scales of the first liquid crystal panel 210 and the second liquid crystal panel 220, and also achieve an effect of improving contrast. In addition, since the Dye in the second liquid crystal panel 220 is a dichroic Dye (Dye-dot), the display panel of a dichroic Dye liquid crystal (Dye-dot LCD) itself can be used as an electrically controlled polarizer 230, and the polarization state of incident light of the display panel of a dichroic Dye liquid crystal does not need to be controlled additionally, so the display panel 200 in the present application can reduce the requirement for the polarizer 230. The stacked display device in fig. 1 requires a minimum of three polarizers 230, and the display panel 200 in the present application requires only two polarizers 230 at most, thereby reducing the cost and the installation process of the display panel 200.
Specifically, fig. 3 is a schematic diagram of a first liquid crystal panel 210, where the first liquid crystal panel 210 includes a first substrate 211 and a second substrate 212 that are disposed opposite to each other, and a liquid crystal layer 213 filled between the first substrate 211 and the second substrate 212, where the first substrate 211 may be an array substrate or a color filter substrate, and is not limited herein.
Fig. 4 is a schematic diagram of a second liquid crystal panel 220, where the second liquid crystal panel 220, that is, a dichroic dye liquid crystal display panel, includes a third substrate 221 and a fourth substrate 222 disposed in opposite directions, and a doped liquid crystal layer 223 filled between the third substrate 221 and the fourth substrate 222, the second liquid crystal panel 220 can be manufactured by the same process as the first liquid crystal panel 210, and the dichroic dye liquid crystal display panel does not need a special electrode design, so that the process difficulty of the manufacturing process is not increased, and only the liquid crystal doped with the dichroic dye is used to replace the originally used liquid crystal material, so that the manufacturing process of the display screen 200 in the present application is not more complicated than the conventional stacked screen manufacturing process.
Fig. 5 and 6 are schematic diagrams illustrating the operation principle of the dye-doped liquid crystal in the second liquid crystal panel 220 (dichroic dye liquid crystal display panel) in the dark state and the bright state, respectively, by using a negative liquid crystal, wherein the large-sized elliptical molecules are liquid crystal molecules, and the small-sized elliptical molecules are dichroic dyes, which are also long rod-shaped molecules. In FIG. 5, the electric field controls the dye molecules to be parallel to the paper surface, since the incident light includes vertically polarized light and horizontally polarized light, and the light parallel to the long axis direction of the dye molecules is strongly absorbed when passing through the dye molecules; therefore, after the incident light enters the second liquid crystal panel 220, the horizontally polarized light is parallel to the long axis direction of the dye molecules and is strongly absorbed, and the other vertically polarized light passes through the second liquid crystal panel 220 but is absorbed by the polarizer 230, so that the bidirectional dye liquid crystal display panel is in a dark state.
In fig. 6, the dye molecules are controlled by the electric field to be perpendicular to the paper surface, and after the incident light enters the second liquid crystal panel 220, both the horizontal polarization light and the vertical polarization light are perpendicular to the long axis direction of the dye molecules (the dye molecules are perpendicular to the polarizer, and the horizontal polarization light and the vertical polarization light are perpendicular to each other, but only along the long axis direction and the short axis direction of the polarizer, so both the horizontal polarization light and the vertical polarization light are perpendicular to the long axis direction of the dye molecules), and are only weakly absorbed, and finally, only one polarization light is absorbed by the polarizer 230, so that the dichroic dye liquid crystal display panel is in a bright state.
The liquid crystal cells in the dichroic dye liquid crystal display panel use vertical alignment films and are aligned in the horizontal direction to form a pre-tilt angle, liquid crystal molecules are arranged in the direction vertical to the glass substrate before voltage is not applied at first, the dichroic dye is inclined to be arranged in parallel with the liquid crystal molecules, at the moment, polarized light in any direction is weakly absorbed and can pass through the liquid crystal cells, and finally, the light forms polarized light through the polarizer 230 and enters the first liquid crystal panel 210; when a voltage is applied, the liquid crystal molecules rotate along with the pretilt angle to be horizontally arranged, and the dye molecules also rotate along with the liquid crystal molecules to be horizontally arranged. When light is incident, light parallel to the long axis direction of the dye molecules has strong absorption characteristics, so only vertically polarized light passes through, and finally, the passing polarized light is absorbed by the lower polarizer 230 because the polarization direction of the passing polarized light is perpendicular to the penetrating axis direction of the lower polarizer of the first liquid crystal panel 210, so that the light can be blocked from penetrating through. The transmission light control of the bidirectional dye liquid crystal display panel mainly utilizes the characteristic of absorption of the bidirectional dye, and is different from the first liquid crystal panel 210 in controlling the transmission rate of light, the extinction ratio of the polarizer 230 and the liquid crystal efficiency of liquid crystal conversion in a polarization state need to be considered, and compared with the first liquid crystal panel 210, the transmission rate of light is higher by using the bidirectional dye liquid crystal display panel, so that the display screen 200 in the application further improves the transmission rate of light.
As shown in fig. 7, as another embodiment of the present application, a structure of a display panel 200 and a schematic diagram of the operation principle thereof in a dark state and a bright state are disclosed. The display panel 200 includes a first liquid crystal panel 210 (liquid crystal panel), a polarizer 230, a second liquid crystal panel 220 (dichroic dye liquid crystal display panel), and a polarizer 230, which are sequentially stacked. In fig. 7, the area a indicates that the pixels in the first liquid crystal panel 210 and the second liquid crystal panel 220 are in a dark state, and the area B indicates that the pixels in the first liquid crystal panel 210 and the second liquid crystal panel 220 are in a bright state, which has been described above and is not repeated herein. Light vertically enters the second liquid crystal panel 220 from below the second liquid crystal panel 220, that is, the light entering surface is on one side of the second liquid crystal panel, a voltage is applied to the pixels in the region a to make the liquid crystal molecules lie flat and drive the dye molecules to absorb the polarized light in the horizontal direction, so that the overall light intensity of the transmitted light after passing through the first polarizer 230 is very low regardless of the polarization state, the first liquid crystal panel 210 is assumed as a VA display panel, and the polarization state of the incident light is not changed in the dark state, so that the dim light which finally passes through the first liquid crystal panel 210 and is parallel to the penetrating axis direction of the polarizer 230 above passes through, and the light in the vertical penetrating axis direction is absorbed by the polarizer 230 above for the second time to form very weak light intensity. On the contrary, in the pixels in the B region, the dye molecules in the second liquid crystal panel 220 are perpendicular to the polarization direction, so all incident light enters the first liquid crystal panel 210 for regulation, and at this time, unlike a general stacked display, the light leaving the second liquid crystal panel 220 is unpolarized light, and the liquid crystal efficiency of converting the polarization state of the liquid crystal does not need to be considered, and the light is only weakly absorbed by the first liquid crystal panel 210, so that the transmittance of the light finally passing through the first liquid crystal panel 210 is close to the transmittance of the first liquid crystal panel 210. In addition, since the light passes through the first liquid crystal panel 210 and then is absorbed by the second liquid crystal panel 220 again, the same effect can be obtained regardless of whether the backlight is disposed on the side close to the first liquid crystal panel 210 or the side close to the second liquid crystal panel 220.
As shown in fig. 8, as another embodiment of the present application, another structure of a display panel 200 and a schematic diagram of the operation principle thereof in a dark state and a bright state are disclosed. The display panel 200 includes a polarizer 230, a first liquid crystal panel 210 (liquid crystal panel), a second liquid crystal panel 220 (dichroic dye liquid crystal display panel), and a polarizer 230, which are sequentially stacked. In fig. 8, the area a indicates that the pixels in the first liquid crystal panel 210 and the second liquid crystal panel 220 are in a dark state, the area B indicates that the pixels in the first liquid crystal panel 210 and the second liquid crystal panel 220 are in a bright state, and the bright and dark states in the first liquid crystal panel 210 and the second liquid crystal panel 220 are described above and are not described herein again. In this embodiment, the polarizer 230 between the first liquid crystal panel 210 and the second liquid crystal panel 220 is omitted, so that the distance between the first liquid crystal panel and the second liquid crystal panel is shortened, thereby improving the viewing angle range of the display 200. Specifically, as shown in fig. 9 and 10, only the opening area in each pixel of the two panels is marked, and the display panel needs to be able to correctly display the picture by passing the light passing through the opening area of the lower pixel in each pixel through the corresponding opening area of the upper display panel, so that the picture can be normal. When the polarizer 230 is interposed between the first liquid crystal panel 210 and the second liquid crystal panel 220, the viewing angle of the opening area in the display panel 200 is represented by θ 1; when the distance between the first liquid crystal panel 210 and the second liquid crystal panel 220 is shortened due to the absence of the polarizer 230, the viewing angle of the opening area in the display panel 200 is represented by θ 2, and it is obvious that the angle of θ 2 is greater than θ 1, and thus it can be concluded that the viewing angle width can be improved in this embodiment. In addition, in this embodiment, since the process of attaching both surfaces of the polarizer 230 to the glass substrate of other display panels is troublesome, only one surface of the polarizer 230 and the glass substrate can be directly operated by the machine, and the process is simple, thereby improving the convenience of the process. It should be noted that, in the present embodiment, the same effect can be obtained whether the backlight is disposed on the side close to the first liquid crystal panel 210 or the side close to the second liquid crystal panel 220.
As shown in fig. 11, as another embodiment of the present application, a structure of a display panel 200 and a schematic diagram of the operation principle thereof in a dark state and a bright state are disclosed. The display panel 200 includes a first liquid crystal panel 210 (liquid crystal panel), a second liquid crystal panel 220 (dichroic dye liquid crystal display panel), and a polarizer 230, which are sequentially stacked. In fig. 11, the area a indicates that the pixels in the first liquid crystal panel 210 and the second liquid crystal panel 220 are in a dark state, the area B indicates that the pixels in the first liquid crystal panel 210 and the second liquid crystal panel 220 are in a bright state, and the bright and dark states in the first liquid crystal panel 210 and the second liquid crystal panel 220 are described above and are not described herein again. Fig. 12 is a schematic diagram of a liquid crystal panel, which includes a first liquid crystal panel 210 and two polarizers 230, where the area a on the left side is in a dark state and the area B on the right side is in a bright state; after passing through the lower polarizer 230, the light intensity is higher in the direction parallel to the transmission axis of the lower polarizer, the polarized light vertically passing through the transmission axis is strongly absorbed and passes through the lower light intensity, the polarization state of the light is not changed when the light passes through the first liquid crystal panel 210, the transmission axis of the second polarizer 230 is perpendicular to the transmission axis of the first polarizer 230, so that the original horizontal polarized light with higher light intensity is also strongly absorbed by the polarizers 230, and finally the light intensity of the transmitted light in two polarization states is very low, so that the effect of a dark state is achieved; in the bright state, the light passing through the polarizer has a higher light intensity in the horizontal polarization state, and after passing through the liquid crystal layer 213, part of the horizontal polarized light is changed into the vertical state by ninety degrees of the rotation polarization direction, and finally, the pixel is displayed as white by the second polarizer, and part of the vertical polarized light is also changed into the horizontal polarized light by ninety degrees, and finally, the horizontal polarized light is absorbed by the second polarizer 230, and the light intensity of the penetrating light in the polarization direction is negligible due to the secondary absorption. Although the analysis of the transmittance of the display panel 200 in the dark state is the same as that of the display panel in fig. 12, the second liquid crystal panel 220 also has the same absorption of the light intensity in the horizontal direction and the same effect as the lower polarizer 230 of the display panel, so that the same dark state quality can be expected; however, in the bright state, since the unpolarized light still passes through the second liquid crystal panel 220 and then passes through the first liquid crystal panel 210, or is unpolarized, the conversion efficiency (liquid crystal efficiency) of the liquid crystal does not need to be considered, because the unpolarized light, which includes parallel polarized light and perpendicular polarized light, passes through the first liquid crystal panel 210 and the second liquid crystal panel 220, and thus the light intensity is the same for the second polarizer 230 regardless of how the liquid crystal molecules are deflected. Finally, the transmittance in the bright state is determined only by the transmittance of the polarizer 230, and the display screen 200 in this embodiment has a higher light transmittance and contrast ratio by the following formula; in addition, only one polarizer 230 is used in the embodiment, so that the production cost and the processing procedure are greatly reduced; since the first liquid crystal panel 210 and the second liquid crystal panel 220 are attached to each other, the viewing angle of the display 200 is also increased.
By the formula
And formulas
In which T is knownCAnd TDThe transmittance, T, of the display panel 200 in FIG. 11 and the first liquid crystal panel 210 in FIG. 12∥And T∥The transmittance of the polarized light with parallel transmission axes of the general polarizer 230 and the second liquid crystal panel 220 (the long axis of the dye molecule in the second liquid crystal panel 220 is the polarization state perpendicular to the long axis), T⊥η, which is the transmittance of the normal polarizer 230 through the axially polarized light, is the conversion efficiency of the liquid crystal layer 213, and is generally about 80%. In formula TDThe last term of (a) is the second absorption, which can be neglected, assuming that T is∥And T∥Similarly, it can be found from the formula that the transmittance of the display panel 200 in this embodiment is about 1/η times of the transmittance of the conventional first liquid crystal panel 210, so that the transmittance of the display panel 200 can be increased and the contrast ratio can be increased.
In the above embodiment, the substrates in the first liquid crystal panel 210 and the second liquid crystal panel 220 are glass substrates, that is, the first substrate 211, the second substrate 212, the third substrate 221, and the fourth substrate 222 are glass substrates, and because the glass material has high light transmittance, the display panel 200 can improve the light transmittance and the brightness. As the dichroic dye, a black dichroic dye S428 (refer to related books "Mitsui, Japan") or others can be used. In addition, the first liquid crystal panel 210 and the second liquid crystal panel 220 are connected by an optical adhesive, and further may be connected by an optical adhesive (optical adhesive) with matched refractive index; the polarizer 230 is connected to the first liquid crystal panel 210 or the second liquid crystal panel 220 through a pressure sensitive adhesive. Moreover, the resolution of the first liquid crystal panel 210 or the second liquid crystal panel 220 on the side far away from the backlight module 260 can be set to be greater than the resolution of the first liquid crystal panel 210 or the second liquid crystal panel 220 close to the backlight module 260, so that the contrast ratio is further improved.
As another embodiment of the present application, a driving method of a display panel 200 is further disclosed, where the display panel 200 includes a first liquid crystal panel 210 and a second liquid crystal panel 220 stacked, a liquid crystal of the second liquid crystal panel 220 is doped with a dichroic dye, and when a picture displayed by the display panel is in a bright state, the driving method includes:
s1: controlling the dye molecules in the second liquid crystal panel to be vertical to incident light;
s2: and controlling the pixels in the first liquid crystal panel to be in high gray scale.
When the picture displayed by the display screen is in a dark state, the driving method comprises the following steps:
s3: controlling the dye molecules in the second liquid crystal panel to be parallel to incident light;
s4: and controlling the pixels in the first liquid crystal panel to be in low gray scale.
As shown in fig. 13, as another embodiment of the present application, a display device 100 is further disclosed, which includes the display screen 200 and a backlight module 260 for providing a light source to the display screen 200.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several deductions or substitutions can be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A display screen, comprising:
a first liquid crystal panel;
the second liquid crystal panel is stacked with the first liquid crystal panel, and the liquid crystal of the second liquid crystal panel is doped with a two-way dye;
the polaroid is arranged at the outer sides of the first liquid crystal panel and the second liquid crystal panel and/or between the first liquid crystal panel and the second liquid crystal panel; when the polaroid is arranged on the outer sides of the first liquid crystal panel and the second liquid crystal panel, the polaroid is connected with the first liquid crystal panel and/or the second liquid crystal panel; when the polarizer is arranged between the first liquid crystal panel and the second liquid crystal panel, the upper surface and the lower surface of the polarizer are respectively connected with the first liquid crystal panel and the second liquid crystal panel;
wherein the number of the polarizers is not more than two.
2. The display screen according to claim 1, wherein the number of the polarizers is two, and one polarizer is disposed on the light incident surface or the light emergent surface of the display screen and connected to the outer side of the first liquid crystal panel or the second liquid crystal panel; the other polarizer is arranged between the first liquid crystal panel and the second liquid crystal panel, and the upper surface and the lower surface of the polarizer are respectively connected with the first liquid crystal panel and the second liquid crystal panel.
3. The display screen of claim 1, wherein the number of the polarizer is two, and the two polarizers are respectively disposed on the light incident surface and the light emergent surface of the display screen and respectively connected to the outer sides of the first liquid crystal panel and the second liquid crystal panel.
4. The display screen of claim 1, wherein the number of the polarizer is one, and the polarizer is disposed on the light incident surface or the light emergent surface of the display screen and connected to the outer side of the first liquid crystal panel or the second liquid crystal panel.
5. The display screen of claim 4, wherein the resolution of the first liquid crystal panel or the second liquid crystal panel on the light exit surface of the display screen is greater than the resolution of the second liquid crystal panel or the first liquid crystal panel on the light entrance surface of the display screen.
6. The display screen of claim 1, wherein the first liquid crystal panel comprises a first substrate and a second substrate which are arranged oppositely, the second liquid crystal panel comprises a third substrate and a fourth substrate which are arranged oppositely, and the first substrate, the second substrate, the third substrate and the fourth substrate are all glass substrates.
7. The display screen of claim 1, wherein the first liquid crystal panel and the second liquid crystal panel are connected by an optical adhesive.
8. The display screen of claim 1, wherein the polarizer is connected to the first liquid crystal panel or the second liquid crystal panel by a pressure sensitive adhesive.
9. A driving method of a display screen is characterized in that the display screen comprises a first liquid crystal panel and a second liquid crystal panel which are arranged in a stacking mode, liquid crystal of the second liquid crystal panel is doped with a dichroic dye, and when a picture displayed by the display screen is in a bright state, the driving method comprises the following steps:
controlling the dye molecules in the second liquid crystal panel to be vertical to incident light; and
controlling pixels in the first liquid crystal panel to be in a high gray scale;
when the picture displayed by the display screen is in a dark state, the driving method comprises the following steps:
controlling the dye molecules in the second liquid crystal panel to be parallel to incident light; and
and controlling the pixels in the first liquid crystal panel to be in low gray scale.
10. A display device comprising the display panel of any one of claims 1 to 8 and a backlight module for providing a light source to the display panel.
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