CN216670451U

CN216670451U - Display module and display device

Info

Publication number: CN216670451U
Application number: CN202121771736.0U
Authority: CN
Inventors: 钟璇; 王家星; 袁洪亮; 武晓娟; 王建; 毕洪生; 赵志强; 孙自起; 张永忠; 曲峰
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-06-03
Anticipated expiration: 2031-07-30

Abstract

The embodiment of the present disclosure provides a display module, including: a first substrate; a second substrate; a liquid crystal layer; the first polarizing film, the first one-half wave plate and the first one-quarter wave plate are further included; the first quarter-wave plate, the first half-wave plate and the first polarizing film are positioned on one side of the first substrate, which is far away from the liquid crystal layer, and are sequentially far away from the first substrate for superposition; the included angle range of the absorption axis of the first polarizing film and the first direction is 85-105 degrees; the included angle range of the slow axis of the first quarter wave plate and the first direction is 105-125 degrees; the retardation range of the first quarter wave plate to the light with the wavelength of 550nm is 260-280 nm; the included angle range of the slow axis of the first quarter-wave plate and the first direction is-20 degrees to 20 degrees; the retardation range of the first quarter-wave plate to the light with the wavelength of 550nm is 136-170 nm; the first direction is a direction perpendicular to an initial alignment direction of the liquid crystal layer.

Description

Display module and display device

Technical Field

The embodiment of the disclosure belongs to the technical field of display, and particularly relates to a display module and a display device.

Background

In recent years, the semi-transparent semi-reflective screen has more and more important applications in the fields of outdoor instruments, high-end mobile phones, wearable displays and the like because the semi-transparent semi-reflective screen has excellent reading capability of a reflective screen in outdoor sunlight and excellent reading capability of a fully-transparent screen in weak light and no light.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a display module and a display device.

In a first aspect, an embodiment of the present disclosure provides a display module, including:

a first substrate; a second substrate; a liquid crystal layer is formed in the cell gap between the first substrate and the second substrate;

the display module further comprises a first polarizing film, a first one-half wave plate and a first one-quarter wave plate; the first quarter-wave plate, the first half-wave plate and the first polarizing film are positioned on one side of the first substrate, which is far away from the liquid crystal layer, and are sequentially far away from the first substrate for superposition;

the first substrate comprises a transmission area and a reflection area, and the thickness of the liquid crystal layer of the transmission area is larger than that of the liquid crystal layer of the reflection area;

the transmission region can transmit light rays incident from the first substrate far away from the second substrate; the reflecting region can reflect the light rays incident from the second substrate far away from the first substrate side;

the included angle range of the absorption axis of the first polarizing film and the first direction is 85-105 degrees;

the included angle range of the slow axis of the first one-half wave plate and the first direction is 105-125 degrees;

the retardation range of the first quarter wave plate to light with the wavelength of 550nm is 260-280 nm;

the included angle between the slow axis of the first quarter-wave plate and the first direction is in a range of-20 degrees to 20 degrees;

the retardation range of the first quarter-wave plate to light with wavelength of 550nm is 136-170 nm;

the first direction is a direction perpendicular to an initial alignment direction of the liquid crystal layer.

In some embodiments, further comprising a second polarizing film, a second half-wave plate, and a second quarter-wave plate; the second quarter-wave plate, the second half-wave plate and the second polarizing film are positioned on one side of the second substrate, which is far away from the liquid crystal layer, and are sequentially far away from the second substrate for superposition;

the angle range of the included angle between the absorption axis of the second polarizing film and the first direction is 0-10 degrees;

the included angle range of the slow axis of the second half wave plate and the first direction is 20-30 degrees;

the retardation range of the second half-wave plate to the light with the wavelength of 550nm is 260-280 nm;

the included angle range of the slow axis of the second quarter-wave plate and the first direction is 80-100 degrees;

the retardation range of the second quarter-wave plate to 550nm wavelength light is 80-115 nm.

In some embodiments, the absorption axis of the first polarizing film has an included angle with the first direction ranging from 90 ° to 100 °;

the included angle range of the slow axis of the first quarter wave plate and the first direction is 110-120 degrees;

the included angle range of the slow axis of the first quarter-wave plate and the first direction is-10 degrees to 10 degrees;

the retardation range of the first quarter-wave plate to 550nm wavelength light is 138-170 nm.

In some embodiments, the slow axis of the second half-wave plate forms an angle with the first direction in a range from 24 ° to 27 °;

the included angle range of the slow axis of the second quarter-wave plate and the first direction is 88-94 degrees.

In some embodiments, the retardation of the liquid crystal layer to light in the transmissive region ranges from 228 nm to 402 nm;

the retardation range of the reflecting area corresponding to the liquid crystal layer to light rays is 101-214 nm.

In some embodiments, the retardation of the liquid crystal layer in the transmissive region is 241-402 nm;

the retardation range of the reflecting area corresponding to the liquid crystal layer to light rays is 121-201 nm.

In some embodiments, the absorption axis of the first polarizing film is at an angle of 95 ° to the first direction;

the included angle between the slow axis of the first quarter wave plate and the first direction is 115 degrees;

the retardation of the first quarter-wave plate to light with the wavelength of 550nm is 270 nm;

the included angle between the slow axis of the first quarter-wave plate and the first direction is 0 degree;

the retardation of the first quarter-wave plate to 550nm wavelength light is 158 nm.

In some embodiments, the absorption axis of the second polarizing film is at an angle of 5 ° to the first direction;

the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees;

the retardation of the second half-wave plate to 550nm wavelength light is 270 nm;

the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees;

the retardation of the second quarter-wave plate to 550nm wavelength light is 110 nm.

In some embodiments, a first alignment film and a second alignment film are further included;

the first orientation film is positioned on one side of the first substrate close to the liquid crystal layer;

the second orientation film is positioned on one side of the second substrate close to the liquid crystal layer;

the first alignment film and the second alignment film are used for initially aligning the liquid crystal layer when the liquid crystal layer is not electrified;

the orientation directions of the first orientation film and the second orientation film are parallel and opposite to each other;

the first direction is perpendicular to the alignment direction of the first alignment film and the second alignment film.

In some embodiments, a scattering film is further included between the second quarter wave plate and the second substrate.

In some embodiments, the first substrate includes a plurality of sub-pixel regions arranged in an array;

each of the sub-pixel regions is divided into the transmissive region and the reflective region.

In some embodiments, the first substrate includes a first base, a pixel circuit, a planarization layer, a reflective layer, and a pixel electrode;

the pixel circuit, the flat layer, the reflecting layer and the pixel electrode are sequentially stacked on one side of the first substrate close to the liquid crystal layer;

the orthographic projection of the flat layer on the first substrate is not overlapped with the transmission region;

the orthographic projection of the reflecting layer on the first substrate is not overlapped with the transmission region;

the orthographic projection of the pixel electrode on the first substrate covers each sub-pixel area;

the pixel electrode is electrically connected to the pixel circuit.

the pixel circuit, the flat layer and the reflecting layer are sequentially stacked on one side, close to the liquid crystal layer, of the first substrate;

the orthographic projection of the pixel electrode on the first substrate is not overlapped with the reflecting area;

the pixel electrode is connected with the reflecting layer in an overlapping manner;

the pixel electrode or the reflective layer is electrically connected to the pixel circuit.

In some embodiments, the second substrate includes a second base and a common electrode;

the common electrode is positioned on one side of the second substrate close to the liquid crystal layer;

the common electrode is a planar electrode, and the orthographic projection of the common electrode on the first substrate at least covers each sub-pixel area.

In some embodiments, the display device further includes a backlight module located on a side of the first substrate facing away from the second substrate, and an orthographic projection of the backlight module on the first substrate is located at least in the transmissive region, and the backlight module is configured to provide backlight for display in the transmissive region.

In some embodiments, the first polarizing film includes a first protective layer, a first polarizer, and a second protective layer;

the first protective layer, the first polarizer and the second protective layer are sequentially superposed;

the second polarizing film comprises a third protective layer, a second polarizer and a fourth protective layer;

the third protective layer, the second polarizer and the fourth protective layer are sequentially superposed;

the first polarizing film, the first one-half wave plate and the first one-quarter wave plate are bonded through a light-transmitting bonding adhesive;

the second polarizing film, the second half-wave plate and the second quarter-wave plate are bonded through a light-transmitting adhesive.

In some embodiments, the first polarizer and the second polarizer both use iodine-based or dye-based polyester materials;

the first half wave plate and the second half wave plate are made of alkane and alkene polymer materials;

the first quarter-wave plate is made of polycarbonate material;

the second quarter-wave plate is made of an alkane and alkene polymer material.

The embodiment of the present disclosure further provides a display module, which includes: a first substrate; a second substrate; a liquid crystal layer is formed in the cell gap between the first substrate and the second substrate; the liquid crystal layer adopts an electric control birefringence liquid crystal;

the display module further comprises a second polarizing film, a second half wave plate and a second quarter wave plate; the second quarter-wave plate, the second half-wave plate and the second polarizing film are positioned on one side of the second substrate, which is far away from the liquid crystal layer, and are sequentially far away from the second substrate for superposition;

the included angle range of the slow axis of the first quarter-wave plate and the first direction is-20 degrees to 20 degrees;

the retardation range of the first quarter-wave plate to 550nm wavelength light is 136-170 nm;

the retardation range of the second quarter-wave plate to 550nm wavelength light is 80-115 nm;

the retardation range of the liquid crystal layer corresponding to the transmission region to light rays is 228-402 nm;

the retardation range of the liquid crystal layer corresponding to the reflection area to light rays is 101-214 nm;

In some embodiments, the absorption axis of the first polarizing film forms an angle with the first direction in a range of 90 ° to 100 °;

In some embodiments, the retardation of the liquid crystal layer to light in the transmissive region is 241-402 nm;

In a second aspect, an embodiment of the present disclosure further provides a display device, which includes the display module.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:

fig. 1 is a schematic cross-sectional view of a structure of a sub-pixel region of a display module according to an embodiment of the disclosure.

Fig. 2 is a schematic view illustrating a partition arrangement of each sub-pixel region in a display module according to an embodiment of the disclosure.

Fig. 3a is a schematic diagram of stacking the first polarizing film, the first one-half wave plate and the first quarter wave plate in the embodiment of the disclosure.

Fig. 3b is a schematic diagram of stacking the second polarizing film with the second half-wave plate and the second quarter-wave plate in the embodiment of the disclosure.

Fig. 4a is a schematic view illustrating the alignment direction of the first alignment film, the first polarizer film, the first quarter-wave plate, and the angle of the optical axis of the first quarter-wave plate in the display module according to the embodiment of the disclosure.

Fig. 4b is a schematic view illustrating the alignment direction of the second alignment film, the second polarizer, the second half-wave plate, and the angle of the optical axis of the second quarter-wave plate in the display module according to the embodiment of the disclosure.

Fig. 5 is a schematic diagram of a corresponding relationship between an angle between the slow axis of the first quarter-wave plate and the first direction and the transmittance and the contrast of the display module, which is drawn according to the simulation data in table 1.

Fig. 6 is a diagram illustrating the relationship between the retardation of the first quarter-wave plate and the transmittance and contrast of the display module according to the simulation data in table 2.

Fig. 7 is a schematic diagram of a corresponding relationship between an angle between the slow axis of the second half-wave plate and the first direction and the reflectivity and the contrast of the display module according to the simulation data in table 3.

FIG. 8 is a diagram illustrating the relationship between the retardation of the second quarter-wave plate and the reflectivity and contrast of the display module according to the simulation data in Table 4.

Fig. 9 is a schematic diagram of the relationship between the different retardation amounts of the liquid crystal layer corresponding to the reflective region to the light and the reflectivity and contrast of the display module according to the simulation data in table 5.

Fig. 10 is a diagram illustrating the relationship between different retardation amounts of the liquid crystal layer corresponding to the transmissive region to light and the transmittance and contrast ratio of the display module according to the simulation data in table 6.

Fig. 11 is a schematic cross-sectional view illustrating another display module according to an embodiment of the disclosure.

FIG. 12 is a schematic diagram of an optical path of the display module shown in FIG. 1 in a white state.

FIG. 13 is a schematic view illustrating the conversion of the polarization state of the light in the reflective region when the display module of FIG. 1 displays a white state.

FIG. 14 is a schematic view illustrating the polarization state conversion of the light in the transmissive region when the display module of FIG. 1 displays a white state.

FIG. 15 is a schematic diagram of an optical path of the display module shown in FIG. 1 in a black state.

FIG. 16 is a schematic view illustrating the conversion of the polarization state of the light in the reflective region when the display module of FIG. 1 displays the black state.

FIG. 17 is a schematic view illustrating the polarization state conversion of the light in the transmissive region when the display module of FIG. 1 displays a black state.

Detailed Description

In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, a display module and a display device provided in the embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings and the detailed description.

The disclosed embodiments will be described more fully hereinafter with reference to the accompanying drawings, but the illustrated embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth in the disclosure. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The disclosed embodiments are not limited to the embodiments shown in the drawings, but include modifications of configurations formed based on a manufacturing process. Thus, the regions illustrated in the figures have schematic properties, and the shapes of the regions shown in the figures illustrate specific shapes of regions, but are not intended to be limiting.

In the prior art, in the existing transflective liquid crystal display module, a lambda/2 wave plate and a lambda/4 wave plate are respectively added in an upper polarizer and a lower polarizer, the upper polarizer and the lower polarizer, and the added lambda/2 wave plate and the added lambda/4 wave plate are matched with a liquid crystal box, so that linear and circular polarization conversion of polarized light is realized, and thus, the opening and closing of a light path are realized through removing/powering up, and further, the transmission/reflection display of the transflective liquid crystal display module is realized. However, in practical application, because the λ/2 wave plate, the λ/4 wave plate and the liquid crystal cell all have dispersion effects, the difference of linear circular polarization conversion efficiency exists for the light of different wave bands in the whole visible light wave band, which is macroscopically represented as that the transflective liquid crystal display module has the problems of low brightness (i.e. low reflectivity/transmittance), low contrast, color cast and the like.

To solve the problems of low brightness, low contrast, color shift, etc. of the transflective liquid crystal display module in the prior art, the embodiment of the present disclosure further provides a display module, referring to fig. 1, which includes: a first substrate 1; a second substrate 2; a liquid crystal layer 3 is formed in the cell gap of the first substrate 1 and the second substrate 2; the display module further comprises a first polarizing film 4, a first one-half wave plate 51 and a first one-quarter wave plate 52; the first quarter-wave plate 52, the first half-wave plate 51 and the first polarizing film 4 are positioned on one side of the first substrate 1 away from the liquid crystal layer 3 and are sequentially overlapped away from the first substrate 1; the first substrate 1 includes a transmissive region 101 and a reflective region 102, and a thickness h1 of the liquid crystal layer 3 of the transmissive region 101 is greater than a thickness h2 of the liquid crystal layer 3 of the reflective region 102; the transmissive region 101 allows light incident from the side of the first substrate 1 away from the second substrate 2 to pass therethrough; the reflective region 102 can reflect light incident from the side of the second substrate 2 away from the first substrate 1; the angle range of the included angle between the absorption axis of the first polarizing film 4 and the first direction is 85-105 degrees; the included angle range of the slow axis of the first quarter wave plate 51 and the first direction is 105-125 degrees; the retardation range of the first quarter-wave plate 51 to the light with the wavelength of 550nm is 260-280 nm; the included angle range of the slow axis of the first quarter-wave plate 52 and the first direction is-20 degrees to 20 degrees; the retardation range of the first quarter-wave plate 52 to the 550nm wavelength light is 136-170 nm; the first direction is a direction perpendicular to the initial alignment direction of the liquid crystal layer 3.

In some embodiments, the display module further comprises a second polarizing film 6, a second half-wave plate 71 and a second quarter-wave plate 72; the second quarter-wave plate 72, the second half-wave plate 71 and the second polarizing film 6 are positioned on one side of the second substrate 2 away from the liquid crystal layer 3 and are sequentially stacked away from the second substrate 2; the angle range of the included angle between the absorption axis of the second polarizing film 6 and the first direction is 0-10 degrees; the included angle range of the slow axis of the second half-wave plate 71 and the first direction is 20-30 degrees; the retardation range of the second half-wave plate 71 to the light with the wavelength of 550nm is 260-280 nm; the included angle range of the slow axis of the second quarter-wave plate 72 and the first direction is 80-100 degrees; the retardation range of the second quarter-wave plate 72 for 550nm wavelength light is 80-115 nm.

In some embodiments, referring to fig. 2, the first substrate 1 includes a plurality of sub-pixel regions 100, the plurality of sub-pixel regions 100 being arranged in an array; each sub-pixel area 100 is divided into a transmissive area 101 and a reflective area 102. The reflective region 102 is provided with a metal reflective layer, and is configured to reflect ambient light incident from the side of the second substrate 2 away from the first substrate 1, and a backlight incident from the side of the first substrate 1 away from the second substrate 2 cannot transmit the ambient light. The transmissive region 101 is not provided with a metal reflective layer so that ambient light incident from the side of the second substrate 2 facing away from the first substrate 1 cannot be reflected, but backlight incident from the side of the first substrate 1 facing away from the second substrate 2 can be transmitted. Thus, the semi-transparent and semi-reflective display of the display module can be realized.

By performing the partition design of the transmissive region 101 and the reflective region 102 on each sub-pixel region 100 of the first substrate 1, the area ratio of the transmissive region 101 and the reflective region 102 in each sub-pixel region 100 can be flexibly designed and adjusted according to the actual requirements of different models or types of display modules on the transmissive brightness and the reflective brightness in the display process in practical application.

In some embodiments, the shapes of the transmissive region 101 and the reflective region 102 in the sub-pixel region 100 may be any shape as long as it is ensured that the transmissive region 101 and the reflective region 102 are spliced to form the whole sub-pixel region 100. For example: referring to fig. 2, the transmissive region 101 may be in a rectangular shape with a small area ratio, that is, the transmissive region 101 is a hole region with a rectangular orthographic projection in the display module; the reflective region 102 is a region having a large area ratio in the sub-pixel region 100 except for the transmissive region 101.

In this embodiment, the linearly polarized light is still linearly polarized after passing through the first half-wave plate 51, and the first half-wave plate 51 is used to implement a part of phase compensation on the light passing through it, so as to improve the conversion efficiency of the first quarter-wave plate 52 on the linear circular polarization state conversion of the visible light with different wavebands; the linearly polarized light is still linearly polarized after passing through the second half-wave plate 71, and the second half-wave plate 71 is used for realizing partial phase compensation on the light passing through the second half-wave plate, so that the conversion efficiency of the second quarter-wave plate 72 on the linear circular polarization state conversion of visible light with different wave bands is improved; and then improve the light efficiency that the display module assembly white state shows, reduce dark state light leak. The polarization angle before the linearly polarized light passes through the first half-wave plate 51 or the second half-wave plate 71 and the polarization angle after passing through the first half-wave plate 51 or the second half-wave plate 71 are mirror symmetric angles. When the polarization direction of the linearly polarized light passing through the first quarter-wave plate 52 or the second quarter-wave plate 72 is 45 degrees with the slow axis direction of the first quarter-wave plate 52 or the second quarter-wave plate 72, the first quarter-wave plate 52 or the second quarter-wave plate 72 can convert the linearly polarized light into circularly polarized light; the first quarter-wave plate 52 and the second quarter-wave plate 72 are used for converting the linear circular polarization state of the light passing through the first quarter-wave plate and the second quarter-wave plate 72, so that the light path of the transflective display module is turned on and off.

In some embodiments, both the first half-wave plate 51 and the second half-wave plate 71 employ an alkylene polymer material (i.e., COP); the wave plate of the material is stretched in a uniaxial direction to form a half wave plate with a fast axis and a slow axis, and the stretching direction of the half wave plate is the slow axis direction of the half wave plate. The first quarter-wave plate 52 is made of Polycarbonate (PC); the wave plate of the material is stretched in a uniaxial direction to form a quarter-wave plate with a fast axis and a slow axis, and the stretching direction of the quarter-wave plate is the slow axis direction of the quarter-wave plate. The second quarter-wave plate 72 is made of an alkylene polymer material (i.e., COP); the wave plate of the material is stretched in a single axial direction to form a quarter wave plate with a fast axis and a slow axis. The light vector direction with low propagation speed in the wave plate is a slow axis, and the light vector direction with high propagation speed in the wave plate is a fast axis.

In some embodiments, referring to fig. 3a, the first polarizing film 4 includes a first protective layer 41, a first polarizer 42, and a second protective layer 43; the first protective layer 41, the first polarizer 42, and the second protective layer 43 are sequentially stacked. The first polarizing film 4, the first one-half wave plate 51 and the first one-quarter wave plate 52 are bonded together by the light-transmitting adhesive 8 to form an integral structure.

In some embodiments, referring to fig. 3b, the second polarizing film 6 includes a third protective layer 61, a second polarizing plate 62, and a fourth protective layer 63; the third protective layer 61, the second polarizer 62, and the fourth protective layer 63 are sequentially stacked. The second polarizing film 6, the second half-wave plate 71 and the second quarter-wave plate 72 are bonded together by the light-transmitting adhesive 8 to form an integral structure.

In some embodiments, when the first polarizing film 4, the first half-wave plate 51 and the first quarter-wave plate 52 are disposed on the first substrate, the first polarizing film 4, the first half-wave plate 51 and the first quarter-wave plate 52 may be separately attached to the first substrate; the first polarizing film 4, the first quarter-wave plate 51 and the first quarter-wave plate 52 may be adhered to the first substrate to form an integral structure.

In some embodiments, when the second polarizing film 6, the second half-wave plate 71 and the second quarter-wave plate 72 are disposed on the second substrate, the second polarizing film 6, the second half-wave plate 71 and the second quarter-wave plate 72 may be separately attached to the second substrate; the second polarizing film 6 may be attached to the second substrate in an integrated structure formed by bonding the second half-wave plate 71 and the second quarter-wave plate 72.

In some embodiments, iodine-based or dye-based polyester materials, such as polyvinyl alcohol (PVA) materials, are used for first polarizer 42 and second polarizer 62, and materials, such as Triacetylcellulose (TAC), are used for first protective layer 41, second protective layer 43, third protective layer 61, and fourth protective layer 63. The first polarizer 42 and the second polarizer 62 are used for converting natural light into linearly polarized light, but PVA is very easy to hydrolyze, and in order to protect physical properties of the polarizing film, a TAC film having high light transmittance, good water resistance and certain mechanical strength is respectively compounded on two sides of the PVA for protection.

In some embodiments, the polarizer is uniaxially stretched to form a polarizer having an absorption axis and a transmission axis, wherein the absorption axis and the transmission axis are perpendicular to each other. Ambient light and backlight all belong to the natural light, and the natural light is including the light of a plurality of polarization directions, and the light that polarization direction is on a parallel with the absorption axis direction of polaroid all can be absorbed in the natural light, and the light of polarization direction perpendicular to polaroid absorption axis direction can see through.

In some embodiments, referring to fig. 1, the display module further includes a first alignment film 9 and a second alignment film 10; the first orientation film 9 is positioned on one side of the first substrate 1 close to the liquid crystal layer; the second alignment film 10 is positioned on one side of the second substrate 2 close to the liquid crystal layer; the first alignment film 9 and the second alignment film 10 are used to perform initial alignment of the liquid crystal when not energized; the alignment directions of the first alignment film 9 and the second alignment film 10 are parallel and opposite to each other.

In this embodiment, referring to fig. 4a and 4b, a bonding area is usually disposed on one side of a plane where the display module is located, and a driving chip (i.e., a driving IC) for driving the display module to display is disposed in the bonding area. The orientation direction of the first orientation film is the rubbing orientation direction thereof, and is defined as a direction L1 in which the setting side of the driving chip (i.e. the driving IC) of the display module points to the opposite side thereof; the orientation direction of the second orientation film is its rubbing orientation direction, and is defined as a direction L2 parallel to and opposite to the direction L1.

In some embodiments, a planar rectangular coordinate system is established in the plane of the display module, the orientation direction L1 of the first orientation film is defined as the Y-axis direction of the planar rectangular coordinate system, and the direction forming an angle of 90 ° with the orientation direction L1 of the first orientation film is defined as the X-axis direction of the planar rectangular coordinate system. Defining the X-axis direction as a first direction, the orientation direction L1 of the first orientation film makes an angle of 90 ° with the first direction; the alignment direction L2 of the second alignment film makes an angle of-90 ° with the first direction, i.e., the first direction is a direction perpendicular to the alignment directions of the first and second alignment films.

In some embodiments, referring to fig. 4a and 4b, an angle θ 1 between an absorption axis of the first polarizing film and the first direction is in a range of 90 ° to 100 °; the included angle alpha 1 between the slow axis of the first quarter wave plate and the first direction is in the range of 110-120 degrees; the included angle beta 1 between the slow axis of the first quarter-wave plate and the first direction is in the range of minus 10 degrees to 10 degrees; the retardation range of the first quarter-wave plate to 550nm wavelength light is 138-170 nm.

In some embodiments, referring to fig. 4a and 4b, the absorption axis of the first polarizing film is at an angle θ 1 of 95 ° to the first direction; the included angle alpha 1 between the slow axis of the first quarter wave plate and the first direction is 115 degrees; the retardation of the first quarter-wave plate to the light with the wavelength of 550nm is 270 nm; the included angle beta 1 between the slow axis of the first quarter-wave plate and the first direction is 0 degree; the retardation of the first quarter-wave plate for 550nm wavelength light is 158 nm.

In some embodiments, referring to fig. 4a and 4b, the angle θ 2 between the absorption axis of the second polarizing film and the first direction is in the range of 0 ° to 10 °; the included angle alpha 2 between the slow axis of the second half-wave plate and the first direction is in the range of 24-27 degrees; the included angle beta 2 between the slow axis of the second quarter-wave plate and the first direction is 88-94 degrees.

In some embodiments, referring to fig. 4a and 4b, the absorption axis of the second polarizing film is at an angle θ 2 of 5 ° to the first direction; the included angle alpha 2 between the slow axis of the second half-wave plate and the first direction is 25 degrees; the retardation of the second half-wave plate to the light with the wavelength of 550nm is 270 nm; the included angle beta 2 between the slow axis of the second quarter-wave plate and the first direction is 90 degrees; the retardation of the second quarter-wave plate for 550nm wavelength light is 110 nm.

In this embodiment, the calculation formulas of the retardation amounts of the first half-wave plate and the second half-wave plate are as follows: r0 ═ (nx-ny) × d 2; wherein d2 is the thickness of the wave plate; nx, ny are the refractive indexes of the slow axis and the fast axis of each half-wave plate to 550nm wavelength light respectively.

In this embodiment, the above-described angle settings of the absorption axis of the first polarizing film, the slow axis of the first quarter-wave plate, and the slow axis of the first quarter-wave plate are all set at an angle viewed from the second substrate side by human eyes. The above-described angular settings of the absorption axis of the second polarizing film, the slow axis of the second half-wave plate, and the slow axis of the second quarter-wave plate are also set at angles viewed from the second substrate side by the human eye.

In this embodiment, the calculation formulas of the retardation amounts of the first quarter-wave plate and the second quarter-wave plate are as follows: r0 ═ (nx '-ny') × d 1; wherein d1 is the thickness of the wave plate; nx ', ny' are the refractive indices of the slow axis and the fast axis of each quarter-wave plate, respectively, for light having a wavelength of 550 nm.

The wavelength of 550nm is a standard reference wavelength in design, and the current display module basically takes the wavelength as a standard for designing parameters of the wave plates and the polaroids.

In some embodiments, referring to FIG. 1, the retardation of the transmissive region 101 corresponding to the liquid crystal layer 3 is in a range of 228-402 nm; the retardation range of the reflective region 102 corresponding to the liquid crystal layer 3 is 101-214 nm.

In some embodiments, the retardation of the transmissive region 101 with respect to the liquid crystal layer 3 is in a range of 241 nm to 402 nm; the retardation range of the reflective region 102 corresponding to the liquid crystal layer 3 is 121-201 nm.

The formula for calculating the retardation of the liquid crystal cell formed by the first substrate 1, the second substrate 2 and the liquid crystal layer 3 in the cell gap is as follows: the retardation of the reflective region 102 is calculated as: re. (reflection) ═ Δ n × h 2; the retardation amount of the transmissive area 101 is calculated by the formula: re. (transmission) ═ Δ n × h 1; wherein h1 is the thickness of the liquid crystal layer 3 in the transmissive region 101; h2 is the thickness of the liquid crystal layer 3 in the reflective region 102; Δ n is a refractive index difference between the major and minor axes of the liquid crystal molecules in the liquid crystal layer 3 with respect to incident light.

In this embodiment, in the feasibility simulation test of the shaft setting angles of the polarizing films and the phase retardation films in the following display module, the first polarizing film and the first phase retardation combined film are referred to as a first light conversion layer; the second polarizing film and the second phase retardation combination film are referred to as a second light-converting layer. The first half wave plate and the second half wave plate are both called lambda/2 or lambda/2 wave plates; the first quarter wave plate and the second quarter wave plate are both called lambda/4 or lambda/4 wave plates; the delay amount is represented by Re.; the liquid crystal layer is represented by LC; the contrast is expressed as CR.

In this embodiment, referring to table 1 and fig. 5, table 1 is a schematic diagram of simulation data of an angle between a slow axis of the first quarter-wave plate and the first direction and an angle between a slow axis of the first quarter-wave plate and the first direction in the embodiment of the present disclosure. The following parameter simulation is carried out on the display module by mainly considering the transmission mode of the display module: an included angle between the absorption axis of the second polarizing film and the first direction is 5 degrees; the second half-wave plate is made of COP materials, the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees, and the retardation of the second half-wave plate to light with the wavelength of 550nm is 270 nm; the second quarter-wave plate is made of COP materials, the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees, and the included angle between the absorption axis of the first polarizing film and the first direction is 95 degrees under the condition that the retardation of the second quarter-wave plate to light with the wavelength of 550nm is 110 nm; the first quarter-wave plate is made of COP materials, and the retardation of the first quarter-wave plate to light with the wavelength of 550nm is 270 nm; the first quarter-wave plate is made of PC material, and the retardation of the first quarter-wave plate to light with the wavelength of 550nm is 158 nm; when the retardation of the liquid crystal layer corresponding to the transmission region to light is 302nm, the included angle between the slow axis of the first one-fourth wave plate and the first direction and the included angle between the slow axis of the first one-fourth wave plate and the first direction are subjected to combined simulation, and the simulation result is represented by the display transmittance and the contrast of the display module. The simulation result shows that, in consideration of transmittance and contrast of the display module, the angle range of the included angle between the slow axis of the first quarter-wave plate and the first direction is preferably 110 to 120 degrees, correspondingly, the angle range of the included angle between the slow axis of the first quarter-wave plate and the first direction is preferably-10 to 10 degrees, and the transmittance and the contrast of the display module are better.

TABLE 1

In this embodiment, referring to table 2 and fig. 6, table 2 is a schematic diagram of simulation data of different retardation amounts for the first quarter-wave plate in the embodiment of the present disclosure. Simulating different retardation amounts of the first quarter-wave plate under the simulation conditions: the included angle between the absorption axis of the second polarizing film and the first direction is 5 degrees; the second half-wave plate is made of COP materials, the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees, and the retardation of the second half-wave plate to light with wavelength of 550nm is 270 nm; the second quarter-wave plate is made of COP materials, the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees, and the included angle between the absorption axis of the first polarizing film and the first direction is 95 degrees; the first one-half wave plate is made of COP materials, the included angle between the slow axis of the first one-half wave plate and the first direction is 115 degrees, and the retardation of the first one-half wave plate to light with wavelength of 550nm is 270 nm; the first quarter-wave plate is made of COP materials, and the included angle between the slow axis of the first quarter-wave plate and the first direction is 0 degree; the retardation of the transmissive region corresponding to the liquid crystal layer to light is 302 nm. The simulation result shows that the transmittance and the contrast of the display module are comprehensively considered, the retardation range of the first quarter-wave plate to the light with the wavelength of 550nm is preferably 138-170 nm, and the transmittance and the contrast of the display module are better.

TABLE 2

In this embodiment, referring to table 3 and fig. 7, table 3 is a schematic diagram of simulation data of an angle between a slow axis of the second half-wave plate and the first direction and an angle between a slow axis of the second quarter-wave plate and the first direction in the embodiment of the present disclosure. The following parameter simulation is carried out on the display module by mainly considering the reflection mode of the display module: the included angle between the absorption axis of the second polarizing film and the first direction is 5 degrees; the second half wave plate is made of COP materials, and the retardation of the second half wave plate to light with the wavelength of 550nm is 270 nm; the second quarter-wave plate is made of COP materials, and when the retardation of the light with the wavelength of 550nm is 110nm and the retardation of the light corresponding to the liquid crystal layer in the reflection region is 147nm, the angle between the slow axis of the second half-wave plate and the first direction and the angle between the slow axis of the second quarter-wave plate and the first direction are simulated in a combined mode, the angle between the slow axis of the second half-wave plate and the first direction and the angle between the slow axis of the second quarter-wave plate and the first direction are considered in a comprehensive mode, the angle range of the slow axis of the second half-wave plate and the first direction is preferably 24-27 degrees, correspondingly, the angle range of the slow axis of the second quarter-wave plate and the first direction is preferably 88-94 degrees, and the reflectivity and the contrast of the display module are better.

TABLE 3

In this embodiment, referring to table 4 and fig. 8, table 4 is a schematic diagram of simulation data of different retardation amounts for the second quarter-wave plate in the embodiment of the present disclosure. Simulating different retardation amounts of the second quarter-wave plate under the simulation conditions: the included angle between the absorption axis of the second polarizing film and the first direction is 5 degrees; the second half-wave plate is made of COP materials, the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees, and the retardation of the second half-wave plate to light with the wavelength of 550nm is 270 nm; the second quarter-wave plate is made of COP materials, and the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees; the retardation of the liquid crystal layer corresponding to the reflecting region to light is 147 nm; the simulation result shows that the reflectivity and the contrast of the display module are comprehensively considered, the delay amount of the light with the wavelength of 550nm of the second quarter-wave plate is preferably 80-115 nm, and the reflectivity and the contrast of the display module are better.

TABLE 4

In this embodiment, referring to table 5 and fig. 9, table 5 is a schematic diagram of simulation data of different retardation amounts of the liquid crystal layer corresponding to the reflective region for light rays in the embodiment of the present disclosure. Simulating different retardation amounts of the liquid crystal layer corresponding to the reflecting area to the light rays, wherein the simulation conditions are as follows: the included angle between the absorption axis of the second polarizing film and the first direction is 5 degrees; the second half-wave plate is made of COP materials, the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees, and the retardation of the second half-wave plate to light with the wavelength of 550nm is 270 nm; the second quarter-wave plate is made of COP materials, and the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees; the retardation of the second quarter-wave plate to 550nm wavelength light is 110 nm; the included angle between the absorption axis of the first polarizing film and the first direction is 95 degrees; the first quarter wave plate is made of COP materials, the included angle between the slow axis of the first quarter wave plate and the first direction is 115 degrees, and the retardation of the first quarter wave plate to light with the wavelength of 550nm is 270 nm; the first quarter-wave plate is made of COP materials, and the included angle between the slow axis of the first quarter-wave plate and the first direction is 0 degree; the retardation of the first quarter-wave plate to 550nm wavelength light is 110 nm; the simulation result shows that the reflectivity and the contrast of the display module are comprehensively considered, the delay amount range of the liquid crystal layer corresponding to the optimal reflecting area to light rays is 121-201 nm, and the reflectivity and the contrast of the display module are better.

TABLE 5

In this embodiment, referring to table 6 and fig. 10, table 6 is a schematic diagram of simulation data of different retardation amounts of the liquid crystal layer corresponding to the transmissive region to the light in the embodiment of the present disclosure. Simulating different retardation amounts of the liquid crystal layer corresponding to the transmission area to light rays, wherein the simulation conditions are as follows: the included angle between the absorption axis of the second polarizing film and the first direction is 5 degrees; the second half-wave plate is made of COP materials, the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees, and the retardation of the second half-wave plate to light with the wavelength of 550nm is 270 nm; the second quarter-wave plate is made of COP materials, and the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees; the retardation of the second quarter-wave plate to 550nm wavelength light is 110 nm; the included angle between the absorption axis of the first polarizing film and the first direction is 95 degrees; the first quarter wave plate is made of COP materials, the included angle between the slow axis of the first quarter wave plate and the first direction is 115 degrees, and the retardation of the first quarter wave plate to light with the wavelength of 550nm is 270 nm; the first quarter-wave plate is made of COP materials, and the included angle between the slow axis of the first quarter-wave plate and the first direction is 0 degree; the retardation of the first quarter-wave plate to 550nm wavelength light is 110 nm; the simulation result shows that the transmittance and the contrast of the display module are comprehensively considered, the preferable retardation range of the liquid crystal layer corresponding to the transmission region to light is 241-402 nm, and the transmittance and the contrast of the display module are better.

TABLE 6

In summary, by performing the above combination matching design on the absorption axis direction of the first polarizing film 4 and the second polarizing film 6 in the display module, the slow axis direction of the first quarter-wave plate 51 and the first quarter-wave plate 52 in the first phase retardation combination film 5 and the retardation thereof for 550nm wavelength light, the slow axis direction of the second half-wave plate 71 and the second quarter-wave plate 72 in the second phase retardation combination film 7 and the retardation thereof for 550nm wavelength light, the retardation of the liquid crystal layer 3 corresponding to the transmission region 101 for light, and the retardation of the liquid crystal layer 3 corresponding to the reflection region 102 for light, the dispersion effect of the half-wave plates, the four half-wave plates, and the liquid crystal box can be reduced, the linear polarization circular state conversion efficiency of the transflective display module for the whole incident light can be improved, and the dark state light leakage can be reduced; thereby improve semi-transparent semi-reflection display module assembly reflection and transmission light efficiency, realize the display module assembly hi-lite, the effect that the high contrast shows.

In some embodiments, referring to fig. 1, the display module further includes a scattering film 11 located between the second quarter-wave plate 72 and the second substrate 2. The scattering film 11 is used for reducing the specular reflection of incident light and emergent light, so that the incident light and the emergent light are subjected to diffuse reflection, and the visual angle of the display module is increased.

In some embodiments, referring to fig. 3b, the second polarizing film 6, the second half-wave plate 71, the second quarter-wave plate 72 and the scattering film 11 are bonded together by the light-transmissive adhesive 8 to form an integral structure.

In some embodiments, referring to fig. 3a, the display module further includes a brightness enhancement film 18 located on a side of the first polarizing film 4 away from the first quarter-wave plate 51, where the brightness enhancement film 18 can enhance the brightness of the backlight provided by the backlight module.

In some embodiments, the brightness enhancement film 18, the first polarizing film 4, the first quarter wave plate 51 and the first quarter wave plate 52 are bonded together by the light-transmissive adhesive 8 to form an integral structure.

In some embodiments, referring to fig. 1, the first substrate 1 includes a first base 12, a pixel circuit 13, a planarization layer 14, a reflective layer 15, and a pixel electrode 16; the pixel circuit 13, the flat layer 14, the reflective layer 15 and the pixel electrode 16 are sequentially stacked on one side of the first substrate 12 close to the liquid crystal layer 3; the orthographic projection of the planarization layer 14 on the first substrate 12 does not overlap the transmissive region 101; the orthographic projection of the reflective layer 15 on the first substrate 12 does not overlap the transmissive region 101; the orthographic projection of the pixel electrode 16 on the first substrate 12 covers each sub-pixel area 100; the pixel electrode 16 is electrically connected to the pixel circuit 13. By not providing the flattening layer 14 and the reflection layer 15 in the transmission region 101, a difference in thickness of the liquid crystal layer 3 between the transmission region 101 and the reflection region 102 can be achieved, and thus a difference in retardation of the liquid crystal layer 3 with respect to light in the transmission region 101 and the reflection region 102 can be achieved.

The reflective layer 15 is made of a reflective metal material. The planarization layer 14 is made of an organic resin material, and the thickness of the organic resin material can be made thicker, which is beneficial to realizing the difference between the thicknesses of the liquid crystal layer 3 in the transmission region 101 and the reflection region 102. The pixel circuit 13 is a pixel electrode driving circuit composed of a plurality of thin film transistors and capacitors, and the pixel circuit 13 may be a conventional driving circuit such as 2T1C, 3T1C, 4T1C, 5T1C, 6T1C, and 7T 1C. The pixel electrode 16 is made of a light-transmitting conductive material, such as an indium tin oxide material; the pixel electrode 16 is connected to a drain electrode of the thin film transistor through a via hole opened in an insulating layer (e.g., a gate insulating layer, a passivation layer, etc.) in the pixel circuit 13.

In some embodiments, referring to fig. 1, the second substrate 2 includes a second base 21 and a common electrode 22; the common electrode 22 is positioned on the side of the second substrate 21 close to the liquid crystal layer 3; the common electrode 22 is a planar electrode, and an orthographic projection of the common electrode 22 on the first substrate 12 at least covers each sub-pixel area 100. The electric field formed by applying voltage to the common electrode 22 and the pixel electrode 16 controls the liquid crystal molecules of the liquid crystal layer 3 to deflect, thereby realizing transflective display of the display module.

In some embodiments, the display module further includes a backlight module 17 located on a side of the first substrate 1 away from the second substrate 2, and an orthogonal projection of the backlight module 17 on the first substrate 1 is located at least in the transmissive region 101, and the backlight module 17 is configured to provide backlight for display in the transmissive region 101. Since the reflective region 101 cannot transmit light, the backlight module 17 can be disposed only in the transmissive region 101; alternatively, the backlight module 17 only provides backlight to the region corresponding to the transmissive region 101, and the backlight module 17 does not provide backlight to the region corresponding to the reflective region 102.

The backlight module 17 includes a backlight source, which may be a direct type backlight source or a side type backlight source.

In some embodiments, the liquid crystal layer 3 employs electrically controlled birefringence liquid crystal (i.e., ECB type liquid crystal). The included angle between the long axis of the liquid crystal molecules and the electric field changes due to different voltages, so that the birefringence of the liquid crystal box changes. The display module adopting the electric control birefringence liquid crystal can realize normally white mode display; when the electric control birefringence liquid crystal is not electrified, the long axes of the liquid crystal molecules are arranged in a nematic way parallel to the first substrate 1, and the display module displays a white state; when the electric control birefringence liquid crystal is electrified, the long axes of the liquid crystal molecules are arranged in a nematic mode perpendicular to the first substrate 1, and the display module displays a black state.

In some embodiments, referring to fig. 11, the first substrate 1 includes a first base 12, a pixel circuit 13, a planarization layer 14, a reflective layer 15, and a pixel electrode 16; the pixel circuit 13, the planarization layer 14 and the reflective layer 15 are sequentially stacked on one side of the first substrate 12 close to the liquid crystal layer 3; the orthographic projection of the planarization layer 14 on the first substrate 12 does not overlap the transmissive region 101; the orthographic projection of the reflective layer 15 on the first substrate 12 does not overlap the transmissive region 101; the orthographic projection of the pixel electrode 16 on the first substrate 12 is not overlapped with the reflection area 102; the pixel electrode 16 is connected with the reflecting layer 15 in a lap joint manner; the pixel electrode 16 or the reflective layer 15 is electrically connected to the pixel circuit 13.

Referring to fig. 11, the pixel electrode 16 is disposed only in the transmissive region 101, the reflective layer 15 is disposed only in the reflective region 102, and the reflective layer 15 of the reflective region 102 reflects incident light to realize reflective display in the reflective region 102; on the other hand, the reflective layer 15 also serves as a pixel electrode of the reflective region 102, and the reflective layer 15 and the pixel electrode 16 are connected in a lap joint manner and collectively serve as a pixel electrode, thereby realizing image display of each sub-pixel region.

In this embodiment, the display module with the above structure can display a white state when no electric field is formed between the pixel electrode 16 and the common electrode 22; the optical path of the display module in displaying the white state refers to fig. 12, fig. 13 and fig. 14; in the reflection area 102, the external ambient light is converted into linearly polarized light in the first polarization direction after passing through the second polarizing film 6; the linearly polarized light in the first polarization direction is still linearly polarized after passing through the second half-wave plate 71, but the phase thereof is compensated by a certain angle, that is, the polarization angle of the linearly polarized light before passing through the second half-wave plate 71 and the polarization angle of the linearly polarized light after passing through the second half-wave plate 71 are mirror symmetry angles; the linearly polarized light after the phase compensation is converted into circularly polarized light in the clockwise direction after passing through the second quarter-wave plate 72; the circularly polarized light is converted into linearly polarized light in a first polarization direction after passing through a liquid crystal layer 3 with a long axis parallel to the nematic arrangement of the first substrate 1; the linearly polarized light with the first polarization direction is still linearly polarized light with the first polarization direction after being reflected by the reflection layer 15 of the reflection area 102, that is, the polarization direction of the linearly polarized light is not changed; the reflected linearly polarized light in the first polarization direction is converted into circularly polarized light in a counterclockwise direction after passing through a liquid crystal layer 3 with a long axis parallel to the first substrate 1 in a nematic arrangement; the circularly polarized light is converted into linearly polarized light in the first polarization direction after passing through the second quarter-wave plate 72; the linearly polarized light in the first polarization direction is subjected to phase compensation after passing through the second half wave plate 71, and is still linearly polarized light; the linearly polarized light is emitted after passing through the second polarizing film 6, and white state display of the reflection area 102 is realized. In the transmission area 101, the backlight provided by the backlight module 17 is converted into linearly polarized light in the first polarization direction after passing through the first polarizing film 4; the linearly polarized light in the first polarization direction obtains phase compensation after passing through the first half wave plate 51, but is still linearly polarized light; the linearly polarized light is converted into the clockwise circularly polarized light after passing through the first quarter-wave plate 52; the clockwise circularly polarized light is converted into anticlockwise circularly polarized light after passing through a liquid crystal layer 3 with a long axis parallel to the nematic arrangement of the first substrate 1; the counterclockwise circularly polarized light is converted into linearly polarized light in the first polarization direction after passing through the second quarter-wave plate 72; the linearly polarized light in the first polarization direction obtains phase compensation after passing through the second half wave plate 71, but is still linearly polarized light; the linearly polarized light is emitted after passing through the second polarizing film 6, and white state display of the transmission region 101 is realized.

In this embodiment, the display module with the above structure displays a black state when an electric field is formed between the pixel electrode 16 and the common electrode 22. The optical path of the display module in the black state is shown in fig. 15, 16 and 17; in the reflection area 102, the external ambient light is converted into linearly polarized light in the first polarization direction after passing through the second polarizing film 6; the linearly polarized light in the first polarization direction is still linearly polarized after passing through the second half-wave plate 71, but the phase thereof is compensated by a certain angle, that is, the polarization angle of the linearly polarized light before passing through the second half-wave plate 71 and the polarization angle of the linearly polarized light after passing through the second half-wave plate 71 are mirror symmetry angles; the linearly polarized light after the phase compensation is converted into circularly polarized light in the clockwise direction after passing through the second quarter-wave plate 72; the circularly polarized light still is clockwise circularly polarized light after passing through the liquid crystal layer 3 with the long axis vertical to the first substrate 1 in nematic arrangement; the clockwise circularly polarized light is still clockwise circularly polarized light after being reflected by the reflective layer 15 of the reflective region 102, i.e. the polarization direction of the clockwise circularly polarized light is not changed; the reflected clockwise circularly polarized light still becomes clockwise circularly polarized light after passing through the liquid crystal layer 3 with the long axis vertical to the first substrate 1; the circularly polarized light is converted into linearly polarized light in the second polarization direction after passing through the second quarter-wave plate 72; the linearly polarized light in the second polarization direction is subjected to phase compensation after passing through the second half wave plate 71, and is still linearly polarized light; the linearly polarized light cannot exit after passing through the second polarizing film 6, and black state display of the reflection area 102 is realized. In the transmission area 101, the backlight provided by the backlight module 17 passes through the first polarizing film 4 and is converted into linearly polarized light with a first polarization direction; the linearly polarized light in the first polarization direction obtains phase compensation after passing through the first half wave plate 51, but is still linearly polarized light; the linearly polarized light is converted into the clockwise circularly polarized light after passing through the first quarter-wave plate 52; the clockwise circularly polarized light still becomes clockwise circularly polarized light after passing through the liquid crystal layer 3 with the long axis vertical to the first substrate 1; the clockwise circularly polarized light is converted into linearly polarized light in a second polarization direction after passing through the second quarter-wave plate 72; the linearly polarized light in the second polarization direction obtains phase compensation after passing through the second half wave plate 71, but is still linearly polarized light; the linearly polarized light cannot exit after passing through the second polarizing film 6, and black state display of the transmission region 101 is realized.

According to the display module provided by the embodiment of the disclosure, by performing a combination matching design on the absorption axis directions of the first polarizing film 4 and the second polarizing film 6, the slow axis directions of the first half-wave plate 51 and the first quarter-wave plate 52 and the retardation of the slow axis directions of the first half-wave plate 71 and the second quarter-wave plate 72 and the retardation of the slow axis directions of the second half-wave plate 72 and the retardation of the slow axis directions of the 550nm wavelength light, the retardation of the liquid crystal layer 3 corresponding to the transmission region 101 and the retardation of the liquid crystal layer 3 corresponding to the reflection region 102 in the display module, the dispersion effects of the half-wave plates, the quarter-wave plates and the liquid crystal box can be reduced, the linear circular polarization state conversion efficiency of the transflective display module on the whole incident light is improved, and the dark state light leakage is reduced; thereby improve semi-transparent semi-reflection display module assembly reflection and transmission light efficiency, realize the display module assembly hi-lite, the effect that the high contrast shows.

To the luminance that semi-transparent semi-reflection liquid crystal display module existed among the open technology low, the contrast is low, the colour cast scheduling problem, this disclosed embodiment still provides a display module assembly, wherein, includes: a first substrate; a second substrate; a liquid crystal layer is formed in the cell gap between the first substrate and the second substrate; the liquid crystal layer adopts an electric control birefringence liquid crystal; the display module further comprises a first polarizing film, a first one-half wave plate and a first one-quarter wave plate; the first quarter-wave plate, the first half-wave plate and the first polarizing film are positioned on one side of the first substrate, which is far away from the liquid crystal layer, and are sequentially far away from the first substrate for superposition; the display module further comprises a second polarizing film, a second half wave plate and a second quarter wave plate; the second quarter-wave plate, the second half-wave plate and the second polarizing film are positioned on one side of the second substrate, which is far away from the liquid crystal layer, and are sequentially far away from the second substrate for superposition; the first substrate comprises a transmission area and a reflection area, and the thickness of the liquid crystal layer in the transmission area is larger than that in the reflection area; the transmission region can enable light rays incident from the side of the first substrate, which is far away from the second substrate, to transmit; the reflecting region can reflect the light rays incident from the second substrate deviating from the first substrate side; the included angle range of the absorption axis of the first polarizing film and the first direction is 85-105 degrees; the included angle range of the slow axis of the first quarter wave plate and the first direction is 105-125 degrees; the retardation range of the first quarter wave plate to the light with the wavelength of 550nm is 260-280 nm; the included angle range of the slow axis of the first quarter-wave plate and the first direction is-20 degrees to 20 degrees; the retardation range of the first quarter-wave plate to the light with the wavelength of 550nm is 136-170 nm; the angle range of the included angle between the absorption axis of the second polarizing film and the first direction is 0-10 degrees; the included angle range of the slow axis of the second half wave plate and the first direction is 20-30 degrees; the retardation range of the second half-wave plate to the light with the wavelength of 550nm is 260-280 nm; the included angle range of the slow axis of the second quarter-wave plate and the first direction is 80-100 degrees; the retardation range of the second quarter-wave plate to the light with the wavelength of 550nm is 80-115 nm; the retardation range of the liquid crystal layer corresponding to the transmission region to light is 228-402 nm; the retardation range of the liquid crystal layer corresponding to the reflecting region to the light is 101-214 nm; the first direction is a direction perpendicular to an initial alignment direction of the liquid crystal layer.

In some embodiments, the absorption axis of the first polarizing film has an included angle with the first direction ranging from 90 ° to 100 °; the included angle range of the slow axis of the first quarter wave plate and the first direction is 110-120 degrees; the included angle between the slow axis of the first quarter-wave plate and the first direction is-10 degrees to 10 degrees; the retardation range of the first quarter-wave plate to 550nm wavelength light is 138-170 nm.

In some embodiments, the slow axis of the second half-wave plate forms an angle with the first direction in the range of 24-27 °; the included angle between the slow axis of the second quarter-wave plate and the first direction is in the range of 88-94 degrees.

In some embodiments, the absorption axis of the first polarizing film is at an angle of 95 ° to the first direction; the included angle between the slow axis of the first quarter wave plate and the first direction is 115 degrees; the retardation of the first quarter-wave plate to the light with the wavelength of 550nm is 270 nm; the included angle between the slow axis of the first quarter-wave plate and the first direction is 0 degree; the retardation of the first quarter-wave plate for 550nm wavelength light is 158 nm.

In some embodiments, the absorption axis of the second polarizing film has an included angle of 5 ° with the first direction; the included angle between the slow axis of the second half-wave plate and the first direction is 25 degrees; the retardation of the second half-wave plate to the light with the wavelength of 550nm is 270 nm; the included angle between the slow axis of the second quarter-wave plate and the first direction is 90 degrees; the retardation of the second quarter-wave plate for 550nm wavelength light is 110 nm.

In some embodiments, the retardation of the liquid crystal layer in the transmissive region is 241-402 nm; the retardation range of the reflective region corresponding to the liquid crystal layer to the light is 121-201 nm.

According to the display module provided by the embodiment of the disclosure, the combination and matching design is carried out on the absorption axis directions of the first polarizing film and the second polarizing film in the display module, the slow axis directions of the first quarter wave plate and the retardation of the slow axis directions of the second half wave plate and the second quarter wave plate and the retardation of the slow axis directions of the second quarter wave plate and the retardation of the light with the wavelength of 550nm in the display module, the retardation of the liquid crystal layer corresponding to the transmission area to the light and the retardation of the liquid crystal layer corresponding to the reflection area to the light, so that the dispersion effect of each half wave plate, each quarter wave plate and the liquid crystal box can be reduced, the linear circular polarization state conversion efficiency of the transflective display module to the whole incident light is improved, and the dark state light leakage is reduced; thereby improve semi-transparent semi-reflection display module assembly reflection and transmission light efficiency, realize the display module assembly hi-lite, the effect that the high contrast shows.

The embodiment of the disclosure further provides a display device, which includes the display module in the above embodiment.

The display device that provides in this disclosed embodiment through adopting the display module assembly in above-mentioned disclosed embodiment, can improve this display device's reflection and transmission light efficiency, improves display device's luminance and contrast.

The embodiment of the present disclosure further provides a display method of the display device, where the method includes: light rays incident from the first substrate far away from the second substrate side are transmitted through the transmission region to be displayed in a transmission mode; light rays incident from the second substrate far away from the first substrate side are reflected by the reflecting region to be reflected and displayed; the display method further comprises: detecting the brightness of the environment light; adjusting the display brightness of the transmission area according to the ambient light brightness; the display brightness of the transmissive region is inversely proportional to the ambient light brightness. The actual adjustment process is as follows: when the ambient light brightness is higher, reducing the backlight brightness of the transmission area so as to close the backlight source; when the ambient light brightness is low, the backlight brightness of the transmission area is improved.

The display device provided by the embodiment of the disclosure can be any product or component with a display function, such as an LCD panel, an LCD television, a display, a mobile phone, a navigator and the like.

It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.

Claims

1. A display module, wherein, includes: a first substrate; a second substrate; a liquid crystal layer is formed in the cell gap between the first substrate and the second substrate;

the included angle range of the slow axis of the first quarter wave plate and the first direction is 105-125 degrees;

2. The display module according to claim 1, further comprising a second polarizer film, a second half-wave plate and a second quarter-wave plate; the second quarter-wave plate, the second half-wave plate and the second polarizing film are positioned on one side of the second substrate, which is far away from the liquid crystal layer, and are sequentially far away from the second substrate for superposition;

the included angle between the absorption axis of the second polarizing film and the first direction is in a range of 0-10 degrees;

the included angle range of the slow axis of the second half-wave plate and the first direction is 20-30 degrees;

3. The display module according to claim 2, wherein the absorption axis of the first polarizing film has an included angle with the first direction in a range of 90 ° to 100 °;

4. The display module according to claim 3, wherein the slow axis of the second half-wave plate forms an angle with the first direction in a range of 24 ° to 27 °;

the included angle between the slow axis of the second quarter-wave plate and the first direction ranges from 88 degrees to 94 degrees.

5. The display module according to claim 4, wherein the retardation of the transmissive region corresponding to the liquid crystal layer to light is in a range of 228-402 nm;

6. The display module according to claim 5, wherein the retardation of the transmissive region corresponding to the liquid crystal layer to light is in a range of 241-402 nm;

7. The display module according to claim 6, wherein the absorption axis of the first polarizing film forms an angle of 95 ° with the first direction;

8. The display module according to claim 7, wherein the absorption axis of the second polarizing film forms an angle of 5 ° with the first direction;

9. The display module according to claim 8, further comprising a first alignment film and a second alignment film;

10. The display module of any of claims 2-9, further comprising a scattering film between the second quarter wave plate and the second substrate.

11. The display module according to any one of claims 1 to 9, wherein the first substrate comprises a plurality of sub-pixel regions arranged in an array;

12. The display module of claim 11, wherein the first substrate comprises a first base, a pixel circuit, a planarization layer, a reflective layer, and a pixel electrode;

the orthographic projection of the flat layer on the first substrate is not overlapped with the transmission area;

the pixel electrode is electrically connected to the pixel circuit.

13. The display module of claim 11, wherein the first substrate comprises a first base, a pixel circuit, a planarization layer, a reflective layer, and a pixel electrode;

14. The display module according to claim 11, wherein the second substrate comprises a second base and a common electrode;

15. The display module according to any one of claims 1 to 9, further comprising a backlight module disposed on a side of the first substrate facing away from the second substrate, wherein an orthographic projection of the backlight module on the first substrate is at least located in the transmissive region, and the backlight module is configured to provide backlight for display in the transmissive region.

16. The display module according to any one of claims 2 to 9, wherein the first polarizing film comprises a first protective layer, a first polarizer and a second protective layer;

the first polarizing film, the first one-half wave plate and the first one-quarter wave plate are bonded through a light-transmitting adhesive;

17. The display module according to claim 16, wherein the first polarizer and the second polarizer are both made of iodine-based or dye-based polyester material;

the first quarter-wave plate is made of polycarbonate material;

the second quarter-wave plate is made of an alkane and alkene polymer material.

18. A display module, wherein, includes: a first substrate; a second substrate; a liquid crystal layer is formed in the cell gap between the first substrate and the second substrate; the liquid crystal layer adopts an electric control birefringence liquid crystal;

19. The display module according to claim 18, wherein the absorption axis of the first polarizing film forms an angle with the first direction in the range of 90 ° to 100 °;

20. The display module according to claim 19, wherein the slow axis of the second half-wave plate forms an angle with the first direction in a range of 24 ° to 27 °;

21. The display module of claim 20, wherein the absorption axis of the first polarizer film is at an angle of 95 ° to the first direction;

22. The display module according to claim 21, wherein the absorption axis of the second polarizing film forms an angle of 5 ° with the first direction;

23. The display module according to claim 22, wherein the retardation of the transmissive region with respect to the liquid crystal layer is 241-402 nm;

24. A display device comprising the display module of any one of claims 1-23.