CN111474777A - Reflective liquid crystal display panel and display device - Google Patents
Reflective liquid crystal display panel and display device Download PDFInfo
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- CN111474777A CN111474777A CN202010400573.9A CN202010400573A CN111474777A CN 111474777 A CN111474777 A CN 111474777A CN 202010400573 A CN202010400573 A CN 202010400573A CN 111474777 A CN111474777 A CN 111474777A
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
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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
- G02F1/133541—Circular 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Geometry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a reflection type liquid crystal display panel, which comprises an array substrate, an opposite substrate arranged opposite to the array substrate and a liquid crystal layer positioned between the array substrate and the opposite substrate, wherein a circular polarizing film is arranged on the array substrate, a pixel electrode is arranged on one side of the array substrate facing the liquid crystal layer, a reflection electrode matched with the pixel electrode is arranged on one side of the opposite substrate facing the liquid crystal layer, the reflection electrode is used for applying public voltage, and the effective phase delay of the liquid crystal layer is lambda/4 in a reflection state. The reflecting electrode and the array substrate are oppositely arranged, and the circular polarizing film is arranged on the array substrate, so that the reflecting electrode not only has a reflecting function, but also can be used as a common electrode, the manufacturing difficulty of the reflecting electrode is reduced, the manufacturing process flow of the reflecting liquid crystal display panel is reduced, the structure is simpler, and the manufacturing cost is reduced. The invention also discloses a display device.
Description
Technical Field
The present invention relates to the field of liquid crystal display technologies, and in particular, to a reflective liquid crystal display panel and a display device.
Background
The reflective display can display images by using external light sources, does not need a backlight source with high energy consumption, can still clearly see information on the display in an outdoor environment with strong sunlight without the problem of a viewing angle, and is widely applied to electronic readers (such as electronic books and electronic newspapers) or other electronic components (such as price labels) due to the advantages of power saving, high reflectivity, contrast ratio and the like.
The surface of the array substrate of a conventional reflective liquid crystal display is generally provided with a metal reflective layer, and light incident into the display device in ambient light can be reflected back by the reflective layer, so that image display of the display is realized by using the ambient light. In order to make the observer view the uniform reflection effect at all viewing angles, the metal reflective layer generally needs to be reprocessed to change the metal surface into an uneven microstructure so as to realize diffuse reflection. However, the reprocessing of the metal reflective layer generally increases the manufacturing process of the layer structure of the array substrate, increases the manufacturing cost and time, increases the manufacturing difficulty of the metal reflective layer on the array substrate, and causes a certain interference to the electrodes on the array substrate.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the present invention provides a reflective liquid crystal display panel and a display device, so as to solve the problems of complicated manufacturing process and high manufacturing cost of the reflective liquid crystal display in the prior art.
The purpose of the invention is realized by the following technical scheme:
The invention provides a reflection type liquid crystal display panel, which comprises an array substrate, an opposite substrate arranged opposite to the array substrate and a liquid crystal layer positioned between the array substrate and the opposite substrate, wherein a circular polarizing sheet is arranged on the array substrate, one side of the array substrate facing the liquid crystal layer is defined by a plurality of scanning lines and a plurality of data lines in an insulated and crossed mode to form a plurality of pixel units, a pixel electrode and a thin film transistor are arranged in each pixel unit, the pixel electrode is electrically connected with the data line adjacent to the thin film transistor through the thin film transistor, one side of the opposite substrate facing the liquid crystal layer is provided with a reflecting electrode matched with the pixel electrode, the reflecting electrode is used for applying common voltage, and the effective phase delay of the liquid crystal layer is lambda/4 in a reflection state.
Further, the surface of the reflecting electrode facing the liquid crystal layer is a rough structure.
Further, the surface of the counter substrate matched with the reflecting electrode is in a rough structure.
Furthermore, a shaping film is arranged on the opposite substrate, the shaping film is arranged between the reflecting electrode and the opposite substrate, and the surface of the shaping film matched with the reflecting electrode is of a rough structure.
Furthermore, the reflective electrode is of a whole surface structure covering the opposite substrate, and the pixel electrodes are of block structures distributed in an array.
Further, the circular polarizer comprises a linear polarizer and a quarter-wave plate, the quarter-wave plate is arranged on one side of the linear polarizer, which faces the liquid crystal layer, and the fast axis and the slow axis of the quarter-wave plate are 45 degrees with the transmission axis of the linear polarizer.
Further, the liquid crystal layer adopts negative liquid crystal molecules, and in an initial state, the negative liquid crystal molecules in the liquid crystal layer are vertical to the array substrate and the opposite substrate.
Further, the liquid crystal layer adopts positive liquid crystal molecules, in an initial state, the positive liquid crystal molecules in the liquid crystal layer are parallel to the array substrate and the opposite substrate, and the alignment direction of the positive liquid crystal molecules on one side close to the array substrate is vertical to the alignment direction of the positive liquid crystal molecules on one side close to the opposite substrate.
Furthermore, the array substrate is also provided with a black matrix corresponding to the plurality of scanning lines and the plurality of data lines.
The invention also provides a display device comprising the reflective liquid crystal display panel.
The invention has the beneficial effects that: the reflective liquid crystal display panel comprises an array substrate, an opposite substrate and a liquid crystal layer, wherein the opposite substrate is arranged opposite to the array substrate, the liquid crystal layer is positioned between the array substrate and the opposite substrate, a circular polarizing plate is arranged on the array substrate, a pixel electrode is arranged on one side, facing the liquid crystal layer, of the array substrate, a reflecting electrode matched with the pixel electrode is arranged on one side, facing the liquid crystal layer, of the opposite substrate, the reflecting electrode is used for applying a common voltage, and when the liquid crystal display panel is in a reflecting state, the effective phase delay of the liquid crystal. The reflecting electrode and the array substrate are oppositely arranged, and the circular polarizing film is arranged on the array substrate, so that the reflecting electrode not only has a reflecting function, but also can be used as a common electrode, the manufacturing difficulty of the reflecting electrode is reduced, the manufacturing process flow of the reflecting liquid crystal display panel is reduced, the structure is simpler, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic plan view of an array substrate according to the present invention;
FIG. 2 is a schematic structural diagram of a reflective liquid crystal display panel in a black state according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a light ray principle of a reflective liquid crystal display panel in a black state according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a reflective liquid crystal display panel in a reflective state according to a first embodiment of the present invention;
FIG. 5 is a schematic view of a reflective liquid crystal display panel in a reflective state according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a reflective liquid crystal display panel in a reflective state according to a second embodiment of the present invention;
FIG. 7 is a schematic view of a reflective liquid crystal display panel according to a second embodiment of the present invention in a reflective state;
FIG. 8 is a schematic structural diagram of a reflective liquid crystal display panel in a black state according to a second embodiment of the present invention;
FIG. 9 is a schematic diagram of the light ray principle of the reflective liquid crystal display panel in the black state according to the second embodiment of the present invention;
FIG. 10 is a schematic diagram of a reflective liquid crystal display panel in a black state according to a third embodiment of the present invention;
Fig. 11 is a schematic structural diagram of a reflective liquid crystal display panel in a black state according to a fourth embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the reflective liquid crystal display panel and the display device according to the present invention with reference to the accompanying drawings and the preferred embodiments is as follows:
[ example one ]
Fig. 1 is a schematic plan view of an array substrate according to the present invention, fig. 2 is a schematic structural view of a reflective liquid crystal display panel in a black state according to a first embodiment of the present invention, fig. 3 is a schematic light ray principle of the reflective liquid crystal display panel in the black state according to the first embodiment of the present invention, fig. 4 is a schematic structural view of the reflective liquid crystal display panel in the reflective state according to the first embodiment of the present invention, and fig. 5 is a schematic light ray principle of the reflective liquid crystal display panel in the reflective state according to the first embodiment of the present invention.
As shown in fig. 1 to fig. 5, a reflective liquid crystal display panel according to a first embodiment of the present invention includes an array substrate 10, a counter substrate 20 disposed opposite to the array substrate 10, and a liquid crystal layer 30 disposed between the array substrate 10 and the counter substrate 20, wherein an effective phase retardation of the liquid crystal layer 30 is λ/4 in a reflective state. The formula of the effective phase retardation of the liquid crystal layer 30 is:
Wherein theta is the included angle between the polarization light propagation direction and the liquid crystal optical axis direction, and n eIs an extraordinary refractive index, n 0Refractive index of normal light, Δ n effFor effective birefringence, d is the cell thickness.
From the above formula, when the liquid crystal cell is thick for a certain period, the effective phase retardation of the corresponding liquid crystal layer 30 is λ/4 when the deflection angle reaches a certain value by changing the deflection angle of the liquid crystal molecules. Of course, the effective phase retardation of the liquid crystal layer 30 can also be made λ/4 by changing the cell thickness.
The array substrate 10 is disposed above the opposite substrate 20, that is, the array substrate 10 is disposed on a side of the reflective liquid crystal display panel close to the external environment. In the present embodiment, the liquid crystal molecules in the liquid crystal layer 30 are negative liquid crystal molecules (liquid crystal molecules having negative dielectric anisotropy), and as shown in fig. 2, in the initial state, the negative liquid crystal molecules in the liquid crystal layer 30 are in a standing posture, that is, the negative liquid crystal molecules in the liquid crystal layer 30 are perpendicular to the array substrate 10 and the counter substrate 20. Of course, the negative liquid crystal molecules may initially have a small angle (e.g. 7 °) to the vertical direction, i.e. the negative liquid crystal molecules are initially not absolutely perpendicular to the first and second substrates 10, 20, and the deflection of the negative liquid crystal molecules towards the horizontal direction may be accelerated when switching to the reflective state.
The array substrate 10 is provided with a circular polarizer 40 for converting external light into circularly polarized light and emitting the circularly polarized light to the liquid crystal layer 30. As shown in fig. 1, a plurality of pixel units P are defined by a plurality of scan lines 1 and a plurality of data lines 2 intersecting with each other in an insulated manner on a side of the array substrate 10 facing the liquid crystal layer 30, a pixel electrode 12 and a thin film transistor 3 are arranged in each pixel unit P, and the pixel electrode 12 is electrically connected with the data line 2 of the adjacent thin film transistor 3 through the thin film transistor 3. The counter substrate 20 is provided with a reflective electrode 21 on a side facing the liquid crystal layer 30, the reflective electrode 21 is configured to cover the entire surface of the counter substrate 20, the pixel electrodes 12 are configured to be arranged in a block shape, and the reflective electrode 21 is configured to apply a common voltage and to serve as a common electrode. The reflection electrode 21 is provided on the counter substrate 20 facing the array substrate 10, so that interference of the reflection electrode 21 with the electrode on the array substrate 10 is prevented, and the difficulty in manufacturing the reflection electrode 21 is greatly reduced. The thin film transistor 3 includes a gate electrode 111, an active layer 112, a drain electrode 113, and a source electrode 114, wherein the gate electrode 111 and the scan line 1 may be located in the same layer and electrically connected, the gate electrode 11 and the active layer 112 are isolated by a first insulating layer 101, the source electrode 114 is electrically connected to the data line 2, and the drain electrode 113 and the pixel electrode 12 are electrically connected through a contact hole on a second insulating layer 102.
In this embodiment, the opposite substrate 20 is further provided with a shaped film 201, the shaped film 201 is disposed between the reflective electrode 21 and the opposite substrate 20, the surface of the shaped film 201, which is matched with the reflective electrode 21, is a rough structure, and the surface of the reflective electrode 21 facing the liquid crystal layer 30 is a rough structure, so that the reflective electrode 21 is diffusely reflected, and at this time, the reflective liquid crystal display panel can be used as electronic paper. Specifically, an embossing process can be used to form a rugged (rough) surface on the shaping film 201, an optimal embossing pattern is designed, and a corresponding shaping film 201 material (the shaping film 201 material can use a special embossing photoresist) is matched to emboss the pattern before uncured, and the photoresist is cured after embossing is completed, so that the surface of the shaping film 201 matched with the reflective electrode 21 is a rough structure, and then a metal film layer is plated on the shaping film 201 to achieve the effect of diffuse reflection. Of course, in other embodiments, the surface of the reflective electrode 21 facing the liquid crystal layer 30 may be a flat surface, so that the reflective electrode 21 has a mirror reflection, and in this case, the reflective liquid crystal display panel may be used as a reflective mirror (e.g., a toilet mirror or a rear view mirror) and may display different patterns.
In this embodiment, the circularly polarizing plate 40 includes a linear polarizing plate 41 and a quarter-wave plate 42, the effective phase retardation of the quarter-wave plate 42 is λ/4, the quarter-wave plate 42 is disposed on the side of the linear polarizing plate 41 facing the liquid crystal layer 30, and the fast and slow axes X2 (fig. 3) of the quarter-wave plate 42 are 45 ° to the transmission axis X1 (fig. 3) of the linear polarizing plate 41. The linearly polarizing plate 41 converts external ambient light into linearly polarized light, and then converts the linearly polarized light into circularly polarized light again by the quarter wave plate 42.
The array substrate 10 may further include a black matrix corresponding to the plurality of scan lines 1 and the plurality of data lines 2. Of course, when the reflective liquid crystal display panel needs to display a color image, a color resist layer or a quantum dot layer may be disposed on the array substrate 10.
the array substrate 10 and the opposite substrate 20 may be made of glass, acrylic, polycarbonate, or other materials, the pixel electrode 12 may be made of Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), and the reflective electrode 21 may be made of A L or Ag, which has a relatively high reflectivity.
As shown in fig. 2 and 3, when the reflective liquid crystal display panel is in a black state (initial state), no voltage is applied to the pixel electrode 12 and the reflective electrode 21, no vertical electric field is formed between the pixel electrode 12 and the reflective electrode 21, and negative liquid crystal molecules in the liquid crystal layer 30 are not deflected and have no phase retardation. As shown in fig. 3, the external environment light I passes through the linear polarizer 41 to become a linearly polarized light parallel to the transmission axis X1, passes through the quarter-wave plate 42 to become a circularly polarized light (for example, left-handed), and passes through the liquid crystal layer 30, because negative liquid crystal molecules in the liquid crystal layer 30 are not deflected, the polarization direction of the light is not changed, and at this time, the circularly polarized light (left-handed) is also changed, after being reflected by the reflective electrode 21, the rotation direction of the circularly polarized light is reversed (left-handed to right-handed), and then returns to and passes through the liquid crystal layer 30 to change the polarization direction of the light, passes through the quarter-wave plate 42 to become a linearly polarized light perpendicular to the transmission axis X1, and is absorbed by the linear polarizer 41, so that.
As shown in fig. 4 and 5, when the reflective liquid crystal display panel is in a reflective state, a pixel voltage is applied to the pixel electrode 12, a common voltage Vcom is applied to the reflective electrode 21, a vertical electric field is formed between the pixel electrode 12 and the reflective electrode 21 (E1 in fig. 4), and negative liquid crystal molecules in the liquid crystal layer 30 are deflected in a direction perpendicular to the vertical electric field, that is, long axes of the negative liquid crystal molecules are deflected in a direction parallel to the array substrate 10 and the opposite substrate 20, and at this time, an effective phase retardation of the liquid crystal layer 30 is λ/4. As shown in fig. 5, the external environment light I passes through the linear polarizer 41 to become a linearly polarized light parallel to the transmission axis X1, passes through the quarter-wave plate 42 to become a circularly polarized light (for example, left-handed), passes through the liquid crystal layer 30 to become a linearly polarized light, is reflected by the reflective electrode 21, passes through the liquid crystal layer 30 to become a circularly polarized light (left-handed), passes through the quarter-wave plate 42 to become a linearly polarized light parallel to the transmission axis X1, and finally passes through the linear polarizer 41, so that the reflective liquid crystal display panel displays a reflective state.
When different images need to be displayed, the pixel electrode 12 applies a gray scale voltage of 0-255 levels, the reflective electrode 21 applies a common voltage Vcom, and when different gray scale voltages are applied to the pixel electrode 12, the pixel unit P presents different brightness, which can be understood as that no voltage or 0-level gray scale voltage is applied to the corresponding pixel electrode 12 in a black state, so that different images can be displayed, and normal display of the reflective liquid crystal display panel in a reflective state is realized.
[ example two ]
Fig. 6 is a schematic structural diagram of a reflective liquid crystal display panel in a reflective state according to a second embodiment of the present invention, fig. 7 is a schematic light ray principle diagram of the reflective liquid crystal display panel in the reflective state according to the second embodiment of the present invention, fig. 8 is a schematic structural diagram of the reflective liquid crystal display panel in the second embodiment of the present invention in a black state, and fig. 9 is a schematic light ray principle diagram of the reflective liquid crystal display panel in the black state according to the second embodiment of the present invention. As shown in fig. 6 to 9, a reflective liquid crystal display panel according to a second embodiment of the present invention is substantially the same as the reflective liquid crystal display panel according to the first embodiment (fig. 1 to 5), except that in this embodiment, the liquid crystal layer 30 uses positive liquid crystal molecules, i.e., liquid crystal molecules having positive dielectric anisotropy. As shown in fig. 6, in the initial state, the positive liquid crystal molecules in the liquid crystal layer 30 are parallel to the array substrate 10 and the opposite substrate 20, and the alignment direction of the positive liquid crystal molecules on the side close to the array substrate 10 and the alignment direction of the positive liquid crystal molecules on the side close to the opposite substrate 20 are perpendicular to each other, that is, the positive liquid crystal molecules in the liquid crystal layer 30 are in a 90 ° twist state. Of course, the positive liquid crystal molecules may have a small pretilt angle (e.g., less than 7 °) when initially aligned, that is, the positive liquid crystal molecules may initially form a small angle with the array substrate 10 and the opposite substrate 20, and the positive liquid crystal molecules may be accelerated to be deflected toward the vertical direction when being switched to the black state.
As shown in fig. 6 and 7, when the reflective liquid crystal display panel is in a reflective state (initial state), no voltage is applied to the pixel electrode 12 and the reflective electrode 21, no vertical electric field is formed between the pixel electrode 12 and the reflective electrode 21, and the positive liquid crystal molecules in the liquid crystal layer 30 are not deflected, and the effective phase retardation of the liquid crystal layer 30 is λ/4. As shown in fig. 7, the external ambient light I passes through the linear polarizer 41 to become linearly polarized light parallel to the transmission axis X1, passes through the quarter-wave plate 42 to become circularly polarized light (for example, left-handed), passes through the liquid crystal layer 30 to become linearly polarized light again, is reflected by the reflective electrode 21 to become circularly polarized light (left-handed), passes through the quarter-wave plate 42 to become linearly polarized light parallel to the transmission axis X1, and finally passes through the linear polarizer 41, so that the reflective liquid crystal display panel displays a reflective state at this time.
As shown in fig. 8 and 9, when the reflective liquid crystal display panel is in a black state, a pixel voltage is applied to the pixel electrode 12, a common voltage Vcom is applied to the reflective electrode 21, a vertical electric field is formed between the pixel electrode 12 and the reflective electrode 21 (E2 in fig. 8), and the positive liquid crystal molecules in the liquid crystal layer 30 are deflected in a direction parallel to the vertical electric field, that is, the long axes of the positive liquid crystal molecules are deflected in a direction perpendicular to the array substrate 10 and the opposite substrate 20, and the liquid crystal layer 30 does not have a phase retardation. As shown in fig. 9, the external environment light I passes through the linear polarizer 41 to become linearly polarized light parallel to the light transmission axis X1, passes through the quarter-wave plate 42 to become circularly polarized light (for example, left-handed), and then passes through the liquid crystal layer 30, because the positive liquid crystal molecules in the liquid crystal layer 30 are perpendicular to the array substrate 10 and the opposite substrate 20, the polarization direction of the light is not changed, and at this time, the circularly polarized light (left-handed) is also circularly polarized light, and after being reflected by the reflective electrode 21, the rotation direction of the circularly polarized light is reversed (left-handed to right-handed), and then the circularly polarized light returns to pass through the liquid crystal layer 30 without changing the polarization direction of the light, passes through the quarter-wave plate 42 to become linearly polarized light perpendicular to the light transmission axis X1, and is.
When different images need to be displayed, 0-255 levels of gray scale voltage is applied to the pixel electrode 12, the common voltage Vcom is applied to the reflective electrode 21, and when different gray scale voltages are applied to the pixel electrode 12, the pixel unit P presents different brightness, which can be understood as applying 255 levels of gray scale voltage to the corresponding pixel electrode 12 in the black state, so that different images can be displayed, and normal display of the reflective liquid crystal display panel in the reflective state is realized.
In contrast to the first embodiment, in the present embodiment, the liquid crystal layer 30 uses positive liquid crystal molecules, and the positive liquid crystal molecules in the liquid crystal layer 30 adopt parallel alignment, so that alignment is easier, and difficulty of a cell forming process is reduced.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
[ third example ]
Fig. 10 is a schematic structural diagram of a reflective liquid crystal display panel in a black state according to a third embodiment of the present invention. As shown in fig. 10, a reflective liquid crystal display panel according to a third embodiment of the present invention is substantially the same as the reflective liquid crystal display panel according to the first embodiment (fig. 1 to 5), except that in this embodiment, the surface of the opposite substrate 20 where the reflective electrode 21 is engaged is a rough structure, so that the reflective electrode 21 is directly covered on the opposite substrate 20 without disposing a shaping film 201. Specifically, the counter substrate 20 may use fine ground glass, and may use a physical or chemical method to treat the surface of the ground glass, and this method needs to strictly control the topography of the ground glass surface, so as to ensure the uniformity of diffuse reflection. And then a metal film layer is plated on the opposite substrate 20 to achieve the effect of diffuse reflection.
In contrast to the first embodiment, in the present embodiment, the opposite substrate 20 is made of fine ground glass, and the reflective electrode 21 directly covers the opposite substrate 20, so that a layer of the shaped film 201 can be reduced, and the cell thickness of the reflective liquid crystal display panel can be reduced.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
[ example four ]
Fig. 11 is a schematic structural diagram of a reflective liquid crystal display panel in a black state according to a fourth embodiment of the present invention. As shown in fig. 10, a reflective liquid crystal display panel according to a fourth embodiment of the present invention is substantially the same as the reflective liquid crystal display panel according to the first embodiment (fig. 1 to 5), except that in this embodiment, the surface of the opposite substrate 20, which is matched with the reflective electrode 21, is a planar structure, and the upper surface of the reflective electrode 21 is a rough structure, so that the fixing film 201 is not required to be disposed. Specifically, a metal film layer is directly plated on the opposing substrate 20, and then the upper surface of the metal film layer is subjected to fine sanding treatment, so that the effect of diffuse reflection can be achieved.
In contrast to the first embodiment, in the present embodiment, the setting film 201 is not required to be disposed, and the upper surface of the direct reflection electrode 21 is subjected to the fine sanding process, so that a layer of the setting film 201 can be reduced, and the cell thickness of the reflective liquid crystal display panel can be reduced.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
The invention also provides a display device comprising the reflective liquid crystal display panel.
In this document, the terms upper, lower, left, right, front, rear and the like are used for defining the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A reflection type liquid crystal display panel comprises an array substrate (10), an opposite substrate (20) arranged opposite to the array substrate (10) and a liquid crystal layer (30) positioned between the array substrate (10) and the opposite substrate (20), and is characterized in that a circular polarizer (40) is arranged on the array substrate (10), one side of the array substrate (10) facing the liquid crystal layer (30) is defined by a plurality of scanning lines (1) and a plurality of data lines (2) which are mutually insulated and crossed to form a plurality of pixel units (P), a pixel electrode (12) and a thin film transistor (3) are arranged in each pixel unit (P), the pixel electrode (12) is electrically connected with the data line (2) adjacent to the thin film transistor (3) through the thin film transistor (3), one side of the opposite substrate (20) facing the liquid crystal layer (30) is provided with a reflection electrode (21) matched with the pixel electrode (12), the reflective electrode (21) is used for applying a common voltage, and the effective phase retardation of the liquid crystal layer (30) is lambda/4 in the reflective state.
2. A reflection type liquid crystal display panel according to claim 1, wherein the reflection electrode (21) has a rough structure on a surface facing the liquid crystal layer (30).
3. A reflection type liquid crystal display panel according to claim 2, wherein a surface of the opposite substrate (20) to which the reflective electrode (21) is fitted is a rough structure.
4. A reflection type liquid crystal display panel according to claim 2, wherein a shape fixing film (201) is further provided on the opposite substrate (20), the shape fixing film (201) is provided between the reflective electrode (21) and the opposite substrate (20), and a surface of the shape fixing film (201) which is engaged with the reflective electrode (21) is a rough structure.
5. A reflection type lcd panel according to claim 1, wherein the reflective electrode (21) is of a full-face structure covering the opposite substrate (20), and the pixel electrodes (12) are of a block structure distributed in an array.
6. A reflective liquid crystal display panel according to claim 1, wherein the circular polarizer (40) comprises a linear polarizer (41) and a quarter-wave plate (42), the quarter-wave plate (42) being disposed on a side of the linear polarizer (41) facing the liquid crystal layer (30), the fast and slow axes of the quarter-wave plate (42) being at 45 ° to the transmission axis of the linear polarizer (41).
7. A reflection type liquid crystal display panel according to claim 1, characterized in that the liquid crystal layer (30) employs negative liquid crystal molecules, and in an initial state, the negative liquid crystal molecules in the liquid crystal layer (30) are perpendicular to the array substrate (10) and the opposite substrate (20).
8. A reflection type liquid crystal display panel according to claim 1, wherein the liquid crystal layer (30) employs positive liquid crystal molecules, and in an initial state, the positive liquid crystal molecules in the liquid crystal layer (30) are parallel to the array substrate (10) and the opposite substrate (20), and an alignment direction of the positive liquid crystal molecules near the array substrate (10) side and an alignment direction of the positive liquid crystal molecules near the opposite substrate (20) side are perpendicular to each other.
9. A reflection type lcd panel according to claim 1, wherein the array substrate (10) further has a black matrix corresponding to the plurality of scan lines (1) and the plurality of data lines (2).
10. A display device comprising the reflection type liquid crystal display panel according to any one of claims 1 to 9.
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| CN202010400573.9A CN111474777A (en) | 2020-05-13 | 2020-05-13 | Reflective liquid crystal display panel and display device |
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| CN202010400573.9A CN111474777A (en) | 2020-05-13 | 2020-05-13 | Reflective liquid crystal display panel and display device |
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