CN112415803A - Liquid crystal display panel, display method thereof and display device - Google Patents
Liquid crystal display panel, display method thereof and display device Download PDFInfo
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- CN112415803A CN112415803A CN201910768626.XA CN201910768626A CN112415803A CN 112415803 A CN112415803 A CN 112415803A CN 201910768626 A CN201910768626 A CN 201910768626A CN 112415803 A CN112415803 A CN 112415803A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 261
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- 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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Abstract
The invention discloses a liquid crystal display panel, a display method and a display device thereof.A second polaroid controls external light to become linearly polarized light in a first direction (for example, 90 degrees) in a display mode, and a first polaroid controls the external light to become linearly polarized light in a vertical direction (for example, 0 degrees) in the first direction; the second liquid crystal layer controls the phase delay lambda/2 of the external light; the first liquid crystal layer controls the phase delay lambda/4 of the external light, and leads the phase delay lambda/2 of the external light passing through the first liquid crystal layer twice, therefore, the external light is absorbed by the first polaroid when irradiating the first polaroid after sequentially passing through the second polaroid, the second liquid crystal layer, the first polaroid, the first liquid crystal layer and the first liquid crystal layer, thereby leading the external light not to cause interference to the color purity of the light emitted by the light source, and improving the color purity of the display picture of the liquid crystal display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a liquid crystal display panel, a display method and a display device thereof.
Background
The reflective liquid crystal display panel has low power consumption and is expected to be used in portable systems, and particularly, the color reflective liquid crystal display panel can be used in portable systems such as electronic newspapers, electronic books, and other alternatives to paper media. However, in the process of realizing color display by the reflective liquid crystal display panel, external light needs to pass through the three primary color resist layer (CF) twice, so that compared with the transmissive liquid crystal display panel, the reflective liquid crystal display panel has poor image quality, low transmittance, low brightness and low contrast, and the color image quality of the reflective liquid crystal display panel cannot meet the requirements. In order to solve the above technical problems, a display technique has appeared in which a front light source is provided on the display side of a reflective liquid crystal display panel. However, the external light may affect the color purity of the light emitted by the front light source, thereby degrading the display quality.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a liquid crystal display panel, a display method thereof and a display apparatus thereof, so as to improve color purity of a display image of the liquid crystal display panel.
Therefore, an embodiment of the present invention provides a liquid crystal display panel, including: the liquid crystal display comprises a reflection type liquid crystal light control structure, a transmission type liquid crystal display structure, a first polarizer and a second polarizer, wherein the reflection type liquid crystal light control structure and the transmission type liquid crystal display structure are arranged in a stacked mode; wherein,
the reflective liquid crystal light control structure comprises a first liquid crystal layer, wherein the first liquid crystal layer controls the phase delay of light passing through the first liquid crystal layer to be 0-lambda/4;
the transmissive liquid crystal display structure includes a second liquid crystal layer controlling a phase retardation of passing light of 0 to λ/2;
the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer.
In a possible implementation manner, in the liquid crystal display panel provided in an embodiment of the present invention, the liquid crystal display panel further includes: a plurality of micro light emitting diodes positioned between the first polarizer and the reflective liquid crystal light control structure;
the light emitting side of each micro light emitting diode faces the reflection type liquid crystal light control structure.
In a possible implementation manner, in the liquid crystal display panel provided in an embodiment of the present invention, the reflective liquid crystal light control structure further includes: and the light control units are in one-to-one correspondence with the sub-pixel units in the transmission type liquid crystal display structure, and each light control unit is provided with a micro light emitting diode.
In a possible implementation manner, in the liquid crystal display panel provided in the embodiment of the present invention, each of the micro light emitting diodes is a single-color micro light emitting diode.
Based on the same inventive concept, an embodiment of the present invention further provides a display method of the liquid crystal display panel, including:
in the display mode, the second liquid crystal layer is controlled to perform a phase retardation of lambda/2 on the passing light.
In a possible implementation manner, in the display method of the liquid crystal display panel provided in the embodiment of the present invention, light emitting sides of the plurality of micro light emitting diodes face the reflective liquid crystal light control structure, and the display method of the liquid crystal display panel further includes:
in the color display mode, controlling the first liquid crystal layer to perform lambda/4 phase delay on the passing light;
and in a black-and-white display mode, the first liquid crystal layer is controlled to perform 0 phase delay on the passing light.
In a possible implementation manner, in the display method of the liquid crystal display panel provided in the embodiment of the present invention, each light control unit in the reflective liquid crystal light control structure includes a micro light emitting diode, and the display method of the liquid crystal display panel further includes:
in the color display mode, controlling the first liquid crystal layer to perform lambda/4 phase delay on the passing light;
and in a black-and-white display mode, the first liquid crystal layer is controlled to perform 0 phase delay on the passing light.
In a possible implementation manner, in the display method of the liquid crystal display panel provided in the embodiment of the present invention, the method further includes:
in a dark state mode, keeping the micro light emitting diodes on, controlling the first liquid crystal layer to perform 0-phase retardation on passing light, and controlling the second liquid crystal layer to perform 0-phase retardation on the passing light.
In a possible implementation manner, in the display method of the liquid crystal display panel provided in the embodiment of the present invention, the method further includes:
and in a dark state mode, keeping the micro light-emitting diodes closed, and controlling the second liquid crystal layer to perform 0 phase delay on passing light.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including: the liquid crystal display panel is provided.
The invention has the following beneficial effects:
the liquid crystal display panel, the display method and the display device provided by the embodiment of the invention comprise the following steps: the liquid crystal display comprises a reflection type liquid crystal light control structure, a transmission type liquid crystal display structure, a first polarizer and a second polarizer, wherein the reflection type liquid crystal light control structure and the transmission type liquid crystal display structure are arranged in a stacked mode; the reflection type liquid crystal light control structure comprises a first liquid crystal layer, wherein the first liquid crystal layer controls the phase delay of light passing through the first liquid crystal layer to be 0-lambda/4; the transmissive liquid crystal display structure includes a second liquid crystal layer controlling a phase retardation of 0 to λ/2 of passing light; the polarization direction of the first polarizer is vertical to the polarization direction of the second polarizer. Since the second polarizer controls the external light to be linearly polarized light in a first direction (e.g., 90 °), and the first polarizer controls the external light to be linearly polarized light in a direction perpendicular to the first direction (e.g., 0 °), in the display mode; the second liquid crystal layer controls the phase delay lambda/2 of the external light; the first liquid crystal layer controls the phase delay lambda/4 of the external light, and leads the phase delay lambda/2 of the external light passing through the first liquid crystal layer twice, therefore, the external light is absorbed by the first polaroid when irradiating the first polaroid after sequentially passing through the second polaroid, the second liquid crystal layer, the first polaroid, the first liquid crystal layer and the first liquid crystal layer, thereby leading the external light not to cause interference to the color purity of the light emitted by the light source, and improving the color purity of the display picture of the liquid crystal display panel.
Drawings
FIG. 1 is a schematic view of an improved LCD panel according to an embodiment of the present invention;
FIG. 2 is a second schematic view of an improved LCD panel according to the second embodiment of the present invention;
FIG. 3 is a schematic view of light paths of the LCD panel of FIG. 1 in a color display mode;
FIG. 4 is a schematic view of light paths of the LCD panel shown in FIG. 1 in a black-and-white display mode;
FIG. 5 is a schematic view of a light path of the LCD panel shown in FIG. 1 in a dark mode;
FIG. 6 is a second schematic view illustrating the light path of the LCD panel of FIG. 1 in the dark mode;
FIG. 7 is a schematic view of light paths of the LCD panel of FIG. 2 in a color display mode;
FIG. 8 is a schematic view of light paths of the LCD panel of FIG. 2 in a black-and-white display mode;
FIG. 9 is a schematic view of a light path of the LCD panel of FIG. 2 in a dark mode;
FIG. 10 is a second schematic view of the light path of the LCD panel shown in FIG. 2 in the dark mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "inner", "outer", "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The shapes and sizes of the various film layers in the drawings do not reflect their true proportions in liquid crystal display panels, and are intended to be merely illustrative of the present invention.
As shown in fig. 1 and 2, an lcd panel according to an embodiment of the present invention includes: a reflective liquid crystal light control structure 001 and a transmissive liquid crystal display structure 002 which are arranged in a laminated manner, a first polarizer 003 which is positioned between the transmissive liquid crystal display structure 002 and the reflective liquid crystal light control structure 001, and a second polarizer 004 which is positioned on one side of the transmissive liquid crystal display structure 002, which is far away from the reflective liquid crystal light control structure 001; wherein,
the reflective liquid crystal light control structure 001 includes a first liquid crystal layer 101, and the first liquid crystal layer 101 controls the phase retardation of light passing through from 0 to λ/4;
the transmissive liquid crystal display structure 002 includes the second liquid crystal layer 201, and the second liquid crystal layer 201 controls the phase retardation of the passing light of 0 to λ/2;
the polarization direction of the first polarizer 003 is perpendicular to that of the second polarizer 004; for convenience of description, the polarization direction of the first polarizer 003 is 0 ° and the polarization direction of the second polarizer 004 is 90 ° in the following description.
In the liquid crystal display panel provided in the embodiment of the present invention, in the display mode, the second polarizer 004 controls the external light to become linearly polarized light in a 90 ° direction (i.e., in the vertical direction), and the first polarizer 003 controls the external light to become linearly polarized light in a 0 ° direction (i.e., in the horizontal direction); the second liquid crystal layer 201 controls the phase delay lambda/2 of the external light; the first liquid crystal layer 101 controls the phase retardation λ/4 of the external light, and causes the phase retardation λ/2 of the external light passing through the first liquid crystal layer 101 twice, so that the external light is absorbed by the first polarizer 003 when being irradiated onto the first polarizer 003 after passing through the second polarizer 004, the second liquid crystal layer 201, the first polarizer 003, the first liquid crystal layer 101 and the first liquid crystal layer 101 in sequence, thereby causing no interference of the external light on the color purity of the light emitted by the light source, and improving the color purity of the display picture of the liquid crystal display panel.
In a specific implementation, to improve the transmittance of the liquid crystal display panel, as shown in fig. 1, the liquid crystal display panel provided in the embodiment of the present invention may further include: a plurality of micro light emitting diodes 005 located between the first polarizer 003 and the reflective liquid crystal light control structure 001;
the light emitting side of each micro light emitting diode 005 faces the reflective liquid crystal light control structure 001.
In a specific implementation, in order to improve the transmittance of the liquid crystal display panel, as shown in fig. 2, the reflective liquid crystal light control structure 001 of the liquid crystal display panel provided in the embodiment of the present invention may further include: a plurality of light control units corresponding to the sub-pixel units in the transmissive liquid crystal display structure 002, each light control unit having a micro light emitting diode 005. Compared with the liquid crystal display panel shown in fig. 1, the liquid crystal display panel shown in fig. 2 integrates the micro light emitting diodes 005 into the reflective liquid crystal light control structure 001, so that the overall thickness of the liquid crystal display panel is reduced, the light and thin design is facilitated, and the liquid crystal display panel has a simple structure and is low in cost.
In a specific implementation, in the liquid crystal display panel provided in the embodiment of the present invention, in order to improve transmittance and realize color display, each micro light emitting diode 005 is a single color light emitting diode, such as a red light emitting diode, a green light emitting diode, or a blue light emitting diode, which is not limited herein.
It is understood that, in the liquid crystal display panel provided by the embodiment of the present invention, the transmissive liquid crystal display structure 002 may further include: a common electrode layer (not shown) and a pixel electrode layer (not shown) on both sides of the second liquid crystal layer 201. The pixel electrode layer is composed of a plurality of pixel electrodes which are insulated from each other; the common electrode layer is a planar electrode, but the common electrode layer may be formed of a plurality of electrically connected common electrodes, and is not limited thereto. The reflective liquid crystal light control structure 001 may also generally include: a first electrode layer (not shown in the figure) on the side of the second liquid crystal layer 201 facing the transmissive liquid crystal display structure 002, and a second electrode layer on the side of the second liquid crystal layer 201 facing away from the transmissive liquid crystal display structure 002. And the second electrode layer is composed of a plurality of reflective electrodes 102 (as shown in fig. 1 and 2) insulated from each other, and each reflective electrode 102 can be integrated with a micro-led 005 in a light control unit (as shown in fig. 2); the first electrode layer may be a planar electrode, but the first electrode layer is not limited to this, and may be formed of a plurality of electrically connected first electrodes.
Based on the same inventive concept, embodiments of the present invention provide a display method of the liquid crystal display panel, and because a principle of the display method to solve the problem is similar to a principle of the liquid crystal display panel to solve the problem, the implementation of the display method provided by embodiments of the present invention may refer to the implementation of the liquid crystal display panel provided by embodiments of the present invention, and repeated details are not repeated.
Specifically, for the liquid crystal display panel, the display method of the liquid crystal display panel provided by the embodiment of the present invention includes:
in the display mode, the second liquid crystal layer is controlled to perform a phase retardation of lambda/2 on the passing light.
In a specific implementation, when the light emitting sides of the micro light emitting diodes face the reflective liquid crystal light control structure, in order to avoid interference of external light on color purity of light emitted by the micro light emitting diodes, the display method of the liquid crystal display panel provided in the embodiment of the present invention may further include the following steps:
in the color display mode, controlling the first liquid crystal layer to perform lambda/4 phase delay on the passing light;
in addition, to realize the black-and-white display screen, the method can further comprise the following steps:
in the black and white display mode, the first liquid crystal layer is controlled to perform 0 phase retardation on the passing light.
In a specific implementation, when each light control unit in the reflective liquid crystal light control structure includes a micro light emitting diode, in order to avoid interference of external light on color purity of light emitted by the micro light emitting diode, the display method of the liquid crystal display panel provided in the embodiment of the present invention may further include the following steps:
in the color display mode, controlling the first liquid crystal layer to perform lambda/4 phase delay on the passing light;
in addition, to realize the black-and-white display screen, the method can further comprise the following steps:
in the black and white display mode, the first liquid crystal layer is controlled to perform 0 phase retardation on the passing light.
In a specific implementation, in the display method of the liquid crystal display panel provided in the embodiment of the present invention, the following steps may be performed in a dark state mode:
in a dark state mode, the micro light emitting diodes are kept on, the first liquid crystal layer is controlled to perform 0-phase retardation on passing light, and the second liquid crystal layer is controlled to perform 0-phase retardation on the passing light.
Or in a dark state mode, keeping the micro light-emitting diodes closed, and controlling the second liquid crystal layer to perform 0 phase delay on the passing light.
To better illustrate the technical solution of the present invention, the following is described in detail with reference to fig. 3 to 10. The polarization direction of the first polarizer 003 is 0 °, the polarization direction of the second polarizer 004 is 90 °, and the micro light emitting diode 005 is a monochromatic light emitting diode.
FIG. 3 is a schematic view of light paths of the LCD panel shown in FIG. 1 in a color display mode. As shown in fig. 3, the micro-leds 005 are kept emitting light with their light emitting sides facing the reflective liquid crystal light control structure. In the color display mode, the second liquid crystal layer 201 performs a phase retardation of λ/2 with respect to the passing light, and the first liquid crystal layer 101 performs a phase retardation of λ/4 with respect to the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the horizontal direction; then, the polarization direction of the first polarizer 003 is unchanged and the first polarizer is still linearly polarized in the horizontal direction; thereafter, the phase thereof is delayed by λ/2 after passing through the first liquid crystal layer 101 twice, becoming linearly polarized light in the vertical direction; finally, after being irradiated onto the first polarizing plate 003, the light is absorbed by the first polarizing plate 003. The vibration directions of the light L2 emitted from the micro leds 005 are uniformly distributed in all directions of the propagation surface, and after passing through the first liquid crystal layer 101 twice, the vibration directions are still uniformly distributed in all directions of the propagation surface; then, the light passes through the first polarizer 003 to be linearly polarized in the horizontal direction; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the vertical direction; finally, the polarization direction of the second polarizer 004 is unchanged, and the second polarizer is linearly polarized in the vertical direction, so that color display is realized.
As can be seen from the above description, in the color display mode, after the external light L1 passes through the second polarizer 004, the second liquid crystal layer 201, the first polarizer 003, the first liquid crystal layer 101 and the first liquid crystal layer 101 in sequence, the light is irradiated onto the first polarizer 003 and absorbed by the first polarizer 003, so that the interference to the color purity of the light L2 emitted by the micro light emitting diode 005 is avoided, and the color purity of the display image of the liquid crystal display panel is improved.
It is to be noted that the liquid crystal display panel shown in fig. 1 provided in the embodiment of the invention can be switched between a color display mode and a black-and-white display mode. Specifically, fig. 4 is a schematic view of a light path of the liquid crystal display panel shown in fig. 1 in a black-and-white display mode.
As shown in fig. 4, the micro light emitting diodes 005 are kept turned off, and in the black and white display mode, the second liquid crystal layer 201 performs a phase retardation of λ/2 on the passing light, and the first liquid crystal layer 101 performs a phase retardation of 0 on the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the horizontal direction; then, the polarization direction of the first polarizer 003 is unchanged and the first polarizer is still linearly polarized in the horizontal direction; then, after passing through the first liquid crystal layer 101 twice, the phase thereof is not delayed and remains linearly polarized light in the horizontal direction; then, the polarization direction of the first polarizer 003 is unchanged and the first polarizer is still linearly polarized in the horizontal direction; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the vertical direction; finally, the polarization direction of the second polarizer 004 is not changed, and the second polarizer is linearly polarized in the vertical direction, so that black and white display is realized.
In addition, fig. 5 and 6 respectively show the light path schematic diagram of the liquid crystal display panel shown in fig. 1 in the dark state mode.
In one possible dark mode, as shown in FIG. 5, the micro-LEDs 005 remain illuminated with their light-exiting sides facing the reflective liquid crystal light management structure, the second liquid crystal layer 201 performs a 0-phase retardation on the passing light, and the first liquid crystal layer 101 performs a 0-phase retardation on the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; then, the polarization direction of the second liquid crystal layer 201 is unchanged after passing through the second liquid crystal layer, and the second liquid crystal layer is still linearly polarized in the vertical direction; finally, after being irradiated onto the first polarizing plate 003, the light is absorbed by the first polarizing plate 003. The vibration directions of the light L2 emitted from the micro leds 005 are uniformly distributed in all directions of the propagation surface, and after passing through the first liquid crystal layer 101 twice, the vibration directions are still uniformly distributed in all directions of the propagation surface; then, the light passes through the first polarizer 003 to be linearly polarized in the horizontal direction; then, the polarization direction of the second liquid crystal layer 201 is unchanged after passing through the second liquid crystal layer, and the second liquid crystal layer is still linearly polarized in the horizontal direction; finally, after being irradiated onto the second polarizing plate 004, it is absorbed by the second polarizing plate 004, and a dark state mode is realized.
As can be seen from the above description, in the dark mode, after the external light L1 passes through the second polarizer 004, the second liquid crystal layer 201 in sequence, it is irradiated onto the first polarizer 003 to be absorbed by the first polarizer 003, so that the external light L1 can be eliminated in the dark mode as well.
In another possible dark mode, as shown in FIG. 6, the micro light emitting diodes 005 remain off, the second liquid crystal layer 201 performs a 0 phase retardation on the passing light, and the first liquid crystal layer 101 performs a 0 or λ/4 phase retardation on the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; then, the polarization direction of the second liquid crystal layer 201 is unchanged after passing through the second liquid crystal layer, and the second liquid crystal layer is still linearly polarized in the vertical direction; finally, after being irradiated onto the first polarizing plate 003, the light is absorbed by the first polarizing plate 003, and a dark mode is realized.
FIG. 7 is a schematic view of light paths of the LCD panel of FIG. 2 in a color display mode. As shown in fig. 7, each light control unit in the reflective liquid crystal light control structure 001 includes a micro light emitting diode 005, and the micro light emitting diodes 005 are kept to emit light. In the color display mode, the second liquid crystal layer 201 performs a phase retardation of λ/2 with respect to the passing light, and the first liquid crystal layer 101 performs a phase retardation of λ/4 with respect to the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the horizontal direction; then, the polarization direction of the first polarizer 003 is unchanged and the first polarizer is still linearly polarized in the horizontal direction; thereafter, the phase thereof is delayed by λ/2 after passing through the first liquid crystal layer 101 twice, becoming linearly polarized light in the vertical direction; finally, after being irradiated onto the first polarizing plate 003, the light is absorbed by the first polarizing plate 003. The vibration directions of the light L2 emitted from the micro leds 005 are uniformly distributed in all directions of the propagation surface, and after passing through the first liquid crystal layer 101, the vibration directions are still uniformly distributed in all directions of the propagation surface; then, the light passes through the first polarizer 003 to be linearly polarized in the horizontal direction; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the vertical direction; finally, the polarization direction of the second polarizer 004 is unchanged, and the second polarizer is linearly polarized in the vertical direction, so that color display is realized.
As can be seen from the above description, in the color display mode, after the external light L1 passes through the second polarizer 004, the second liquid crystal layer 201, the first polarizer 003, the first liquid crystal layer 101 and the first liquid crystal layer 101 in sequence, the light is irradiated onto the first polarizer 003 and absorbed by the first polarizer 003, so that the interference to the color purity of the light L2 emitted by the micro light emitting diode 005 is avoided, and the color purity of the display image of the liquid crystal display panel is improved.
It is to be noted that the liquid crystal display panel shown in fig. 2 provided in the embodiment of the invention can be switched between a color display mode and a black-and-white display mode. Specifically, fig. 8 is a schematic view of a light path of the liquid crystal display panel shown in fig. 2 in a black-and-white display mode.
As shown in fig. 8, the micro light emitting diodes 005 are kept turned off, and in the black and white display mode, the second liquid crystal layer 201 performs a phase retardation of λ/2 on the passing light, and the first liquid crystal layer 101 performs a phase retardation of 0 on the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the horizontal direction; then, the polarization direction of the first polarizer 003 is unchanged and the first polarizer is still linearly polarized in the horizontal direction; then, after passing through the first liquid crystal layer 101 twice, the phase thereof is not delayed and remains linearly polarized light in the horizontal direction; then, the polarization direction of the first polarizer 003 is unchanged and the first polarizer is still linearly polarized in the horizontal direction; thereafter, the phase thereof is delayed by λ/2 after passing through the second liquid crystal layer 201, becoming linearly polarized light in the vertical direction; finally, the polarization direction of the second polarizer 004 is not changed, and the second polarizer is linearly polarized in the vertical direction, so that black and white display is realized.
In addition, fig. 9 and 10 respectively show the light path schematic diagram of the liquid crystal display panel shown in fig. 2 in the dark state mode.
In one possible dark mode, as shown in FIG. 9, the micro light emitting diodes 005 remain emitting light, the second liquid crystal layer 201 performs a 0-phase retardation on the passing light, and the first liquid crystal layer 101 performs a 0-phase retardation on the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; then, the polarization direction of the second liquid crystal layer 201 is unchanged after passing through the second liquid crystal layer, and the second liquid crystal layer is still linearly polarized in the vertical direction; finally, after being irradiated onto the first polarizing plate 003, the light is absorbed by the first polarizing plate 003. The vibration directions of the light L2 emitted from the micro leds 005 are uniformly distributed in all directions of the propagation surface, and after passing through the first liquid crystal layer 101, the vibration directions are still uniformly distributed in all directions of the propagation surface; then, the light passes through the first polarizer 003 to be linearly polarized in the horizontal direction; then, the polarization direction of the second liquid crystal layer 201 is unchanged after passing through the second liquid crystal layer, and the second liquid crystal layer is still linearly polarized in the horizontal direction; finally, after being irradiated onto the second polarizing plate 004, it is absorbed by the second polarizing plate 004, and a dark state mode is realized.
As can be seen from the above description, in the dark mode, after the external light L1 passes through the second polarizer 004, the second liquid crystal layer 201 in sequence, it is irradiated onto the first polarizer 003 to be absorbed by the first polarizer 003, so that the external light L1 can be eliminated in the dark mode as well.
In another possible dark mode, as shown in FIG. 10, the micro light emitting diodes 005 are kept off, the second liquid crystal layer 201 performs a 0 phase retardation on the passing light, and the first liquid crystal layer 101 performs a 0 or λ/4 phase retardation on the passing light. The concrete expression is as follows: the external light L1 becomes linearly polarized light in the vertical direction after passing through the second polarizer 004; then, the polarization direction of the second liquid crystal layer 201 is unchanged after passing through the second liquid crystal layer, and the second liquid crystal layer is still linearly polarized in the vertical direction; finally, after being irradiated onto the first polarizing plate 003, the light is absorbed by the first polarizing plate 003, and a dark mode is realized.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the liquid crystal display panel provided by the embodiment of the present invention, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an intelligent watch, a fitness wrist strap, and a personal digital assistant. Since the principle of the display device to solve the problem is similar to that of the liquid crystal display panel, the implementation of the display device can be referred to the above embodiments of the liquid crystal display panel, and repeated descriptions are omitted.
The liquid crystal display panel, the display method and the display device provided by the embodiment of the invention comprise the following steps: the liquid crystal display comprises a reflection type liquid crystal light control structure, a transmission type liquid crystal display structure, a first polarizer and a second polarizer, wherein the reflection type liquid crystal light control structure and the transmission type liquid crystal display structure are arranged in a stacked mode; the reflection type liquid crystal light control structure comprises a first liquid crystal layer, wherein the first liquid crystal layer controls the phase delay of light passing through the first liquid crystal layer to be 0-lambda/4; the transmissive liquid crystal display structure includes a second liquid crystal layer controlling a phase retardation of 0 to λ/2 of passing light; the polarization direction of the first polarizer is vertical to the polarization direction of the second polarizer. Since the second polarizer controls the external light to be linearly polarized light in a first direction (e.g., 90 °), and the first polarizer controls the external light to be linearly polarized light in a direction perpendicular to the first direction (e.g., 0 °), in the display mode; the second liquid crystal layer controls the phase delay lambda/2 of the external light; the first liquid crystal layer controls the phase delay lambda/4 of the external light, and leads the phase delay lambda/2 of the external light passing through the first liquid crystal layer twice, therefore, the external light is absorbed by the first polaroid when irradiating the first polaroid after sequentially passing through the second polaroid, the second liquid crystal layer, the first polaroid, the first liquid crystal layer and the first liquid crystal layer, thereby leading the external light not to cause interference to the color purity of the light emitted by the light source, and improving the color purity of the display picture of the liquid crystal display panel.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A liquid crystal display panel, comprising: the liquid crystal display comprises a reflection type liquid crystal light control structure, a transmission type liquid crystal display structure, a first polarizer and a second polarizer, wherein the reflection type liquid crystal light control structure and the transmission type liquid crystal display structure are arranged in a stacked mode; wherein,
the reflective liquid crystal light control structure comprises a first liquid crystal layer, wherein the first liquid crystal layer controls the phase delay of light passing through the first liquid crystal layer to be 0-lambda/4;
the transmissive liquid crystal display structure includes a second liquid crystal layer controlling a phase retardation of passing light of 0 to λ/2;
the polarization direction of the first polarizer is perpendicular to the polarization direction of the second polarizer.
2. The liquid crystal display panel according to claim 1, further comprising: a plurality of micro light emitting diodes positioned between the first polarizer and the reflective liquid crystal light control structure;
the light emitting side of each micro light emitting diode faces the reflection type liquid crystal light control structure.
3. The liquid crystal display panel of claim 1, wherein the reflective liquid crystal light management structure further comprises: and the light control units are in one-to-one correspondence with the sub-pixel units in the transmission type liquid crystal display structure, and each light control unit is provided with a micro light emitting diode.
4. The liquid crystal display panel according to claim 2 or 3, wherein each of the micro light emitting diodes is a monochromatic micro light emitting diode.
5. A display method of a liquid crystal display panel according to any one of claims 1 to 4, comprising:
in the display mode, the second liquid crystal layer is controlled to perform a phase retardation of lambda/2 on the passing light.
6. The method of claim 5, wherein the light emitting sides of the micro-leds face the reflective lc light management structure, the method further comprising:
in the color display mode, controlling the first liquid crystal layer to perform lambda/4 phase delay on the passing light;
and in a black-and-white display mode, the first liquid crystal layer is controlled to perform 0 phase delay on the passing light.
7. The method as claimed in claim 5, wherein each of the light control units in the reflective liquid crystal light control structure comprises a micro light emitting diode, and the method further comprises:
in the color display mode, controlling the first liquid crystal layer to perform lambda/4 phase delay on the passing light;
and in a black-and-white display mode, the first liquid crystal layer is controlled to perform 0 phase delay on the passing light.
8. The display method of the liquid crystal display panel according to claim 6 or 7, further comprising:
in a dark state mode, keeping the micro light emitting diodes on, controlling the first liquid crystal layer to perform 0-phase retardation on passing light, and controlling the second liquid crystal layer to perform 0-phase retardation on the passing light.
9. The display method of the liquid crystal display panel according to claim 6 or 7, further comprising:
and in a dark state mode, keeping the micro light-emitting diodes closed, and controlling the second liquid crystal layer to perform 0 phase delay on passing light.
10. A display device, comprising: a liquid crystal display panel according to any one of claims 1 to 4.
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