Display module

Abstract

The utility model discloses a display module. The display module comprises a display panel, a first polaroid arranged on the light inlet side of the display panel, a second polaroid arranged on the light outlet side of the display panel and a polarization conversion layer arranged between the first polaroid and the second polaroid. The polarization conversion layer can play a role in adjusting the polarization direction of the light. The polarization conversion layer comprises a second liquid crystal layer, and the orthographic projection, on the first polaroid, of the long axis of first liquid crystal particles in the second liquid crystal layer intersects with the absorption axis of the first polaroid and forms an acute included angle ranging from 40 degrees to 50 degrees. The polarization direction of light passing through the first polaroid is changed by about 90 degrees after penetrating through the polarization conversion layer, so that the absorption axis of the second polaroid can be arranged to be parallel to the absorption axis of the first polaroid, and the long sides of the first polaroid and the second polaroid are both parallel to the length direction of the polaroid coiled material. The size specification maximization of the first polaroid and the second polaroid is achieved, and the liquid crystal display module with the oversized size can be achieved.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a display module. Background Art

[0002] With the rapid development of display technology, the application of liquid crystal display (LCD) modules has expanded from small-sized mobile phones to large-sized computers, TVs, etc. Liquid crystal display modules are usually composed of a display panel, an upper polarizer located on the light-emitting side of the display panel, a lower polarizer located on the light-incoming side of the display panel, and a backlight module. Due to the limitation of the cutting width of the polarizer and the requirements of the liquid crystal display module for the absorption axis of the lower polarizer, the length of the lower polarizer cannot meet the size specification requirements of the super-large-sized liquid crystal display module, which makes it difficult for the liquid crystal display module to develop in the direction of super-large size.

[0003] Therefore, there is an urgent need for a technical solution that breaks through the size limitation of polarizers and realizes an ultra-large-sized liquid crystal display module. Utility Model Content

[0004] The purpose of the present application is to provide a display module that can overcome the limitation of the size of the polarizer on the size of the display module.

[0005] In order to solve the above technical problems, the present application provides a display module, including:

[0006] A display panel, the display panel having a light incident side and a light exiting side, the display panel comprising a first liquid crystal layer;

[0007] A first polarizer, arranged on the light incident side of the display panel;

[0008] A second polarizer is arranged on the light-emitting side of the display panel, and the absorption axis of the first polarizer is parallel to the absorption axis of the second polarizer;

[0009] A polarization conversion layer is arranged between the first polarizer and the second polarizer, the polarization conversion layer includes a second liquid crystal layer, the second liquid crystal layer includes first liquid crystal particles, in a working state, the long axis of the first liquid crystal particle is parallel to the plane where the first polarizer is located, the orthographic projection of the long axis of the first liquid crystal particle on the first polarizer intersects with the absorption axis of the first polarizer, and the acute angle between the orthographic projection of the long axis of the first liquid crystal particle on the first polarizer and the absorption axis of the first polarizer is 40° to 50°.

[0010] In one embodiment, the acute angle between the orthographic projection of the long axis of the first liquid crystal particle on the first polarizer and the absorption axis of the first polarizer is 45°.

[0011] In one embodiment, the polarization conversion layer is disposed between the first polarizer and the display panel, or the polarization conversion layer is disposed between the second polarizer and the display panel.

[0012] In one embodiment, the polarization conversion layer further includes a substrate layer and an alignment layer, the alignment layer is arranged on one side of the substrate layer, and the second liquid crystal layer is arranged on a side of the alignment layer away from the substrate layer.

[0013] In one embodiment, the first liquid crystal particles are positive liquid crystal particles, the refractive index of the first liquid crystal particles in the first direction is greater than the refractive index of the first liquid crystal particles in the second direction, the refractive index of the first liquid crystal particles in the third direction is equal to the refractive index of the first liquid crystal particles in the second direction, the first direction, the second direction and the third direction are perpendicular to each other, and the first direction is perpendicular to the plane where the polarization conversion layer is located.

[0014] In one embodiment, the thickness of the second liquid crystal layer is 260 nanometers to 300 nanometers.

[0015] In one embodiment, the polarization conversion layer further includes a first electrode and a second electrode, wherein the first electrode is located on one side of the second liquid crystal layer, and the second electrode is located on a side of the second liquid crystal layer away from the first electrode.

[0016] In one embodiment, the first electrode includes a plurality of first sub-electrodes arranged in an array, the second electrode includes a plurality of second sub-electrodes arranged in an array, and one first sub-electrode is disposed correspondingly to one second sub-electrode.

[0017] In one embodiment, the angle between the absorption axis of the first polarizer and the long side of the first polarizer is 0°, and the angle between the absorption axis of the second polarizer and the long side of the second polarizer is 0°.

[0018] In one embodiment, the length of the first polarizer is greater than 2530 mm, and the length of the second polarizer is greater than 2530 mm.

[0019] The display module provided by the embodiment of the present application includes a display panel, a first polarizer arranged on the light incident side of the display panel, a second polarizer arranged on the light exit side, and a polarization conversion layer arranged between the first polarizer and the second polarizer. The polarization conversion layer can play a role in adjusting the polarization direction of light. The polarization conversion layer includes a second liquid crystal layer, and the orthographic projection of the long axis of the first liquid crystal particle in the second liquid crystal layer on the first polarizer intersects with the absorption axis of the first polarizer and has an acute angle of 40° to 50°. The polarization direction of the light passing through the first polarizer changes by about 90° through the polarization conversion layer, so that the absorption axis of the second polarizer can be set to be parallel to the absorption axis of the first polarizer, then the long sides of the first polarizer and the second polarizer are parallel to the length direction of the polarizer coil, so as to maximize the size specifications of the first polarizer and the second polarizer, which is conducive to the realization of an ultra-large liquid crystal display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a display module provided in the first embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the positional relationship between the absorption axes of the first liquid crystal particles and the first polarizer in the display module provided in the first embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the polarization direction of light propagation when the display module provided by the first embodiment of the present application is in a dark state;

[0023] Figure 4 is a schematic diagram of the polarization direction of light propagation when the display module provided by the first embodiment of the present application is in a bright state;

[0024] Figure 5 It is a schematic diagram of the method of cutting polarizers in a polarizer roll;

[0025] Figure 6 is a schematic diagram of a polarization conversion layer in a display module provided in the first embodiment of the present application;

[0026] Figure 7 is a schematic diagram of a display module provided in a second embodiment of the present application;

[0027] Figure 8 is a schematic diagram of the polarization direction of light propagation when the display module provided by the second embodiment of the present application is in a dark state;

[0028] Fig. 9 is a schematic diagram of the polarization direction of light propagation when the display module provided by the second embodiment of the present application is in a bright state;

[0029] Fig.10It is a schematic diagram of a polarization conversion layer in a display module provided in the second embodiment of the present application.

[0030] Reference numerals: display module 100; second polarizer 110; polarization conversion layer 120; display panel 130; first polarizer 140;

[0031] A second liquid crystal layer 121; an alignment layer 122; a substrate layer 123; a first electrode 124; and a second electrode 125;

[0032] The absorption axis A1 of the first polarizer; the absorption axis A2 of the second polarizer; the first liquid crystal particle L1; the second liquid crystal particle L2; the long axis I of the first liquid crystal particle;

[0033] Polarizer roll 200. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The technical solutions described below are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0035] In addition, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0036] In the description of the present application, the directions or positional relationships indicated by “upper”, “lower”, “front”, “back”, “left”, “right”, “inside”, “outside”, etc. are based on the directions or positional relationships shown in the drawings, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0037] The various embodiments provided in this application are similar, and features in different embodiments may be combined with each other.

[0038] Please refer to Figure 1 The display module 100 includes a display panel 130, a first polarizer 140, a second polarizer 110 and a polarization conversion layer 120. The display panel 130 has a light incident side and a light emitting side, and the display panel 130 includes a first liquid crystal layer. The first polarizer 140 is arranged on the light incident side of the display panel 130. The second polarizer 110 is arranged on the light emitting side of the display panel 130. The absorption axis A1 of the first polarizer 140 is parallel to the absorption axis A2 of the second polarizer 110. The polarization conversion layer 120 is arranged between the first polarizer 140 and the second polarizer 110. The polarization conversion layer 120 includes a second liquid crystal layer 121, and the second liquid crystal layer 121 includes first liquid crystal particles L1. Please refer to Figure 2 , Figure 2 Schematic diagram of the positional relationship between the first liquid crystal particle L1 and the absorption axis A1 of the first polarizer 140 in the display module 100. It should be noted that the long axis I of the first liquid crystal particle L1 is parallel to the plane where the polarization conversion layer 120 is located, that is, the long axis I of the first liquid crystal particle L1 is parallel to the first polarizer 140. In the working state, the long axis I of the first liquid crystal particle L1 is projected onto the plane where the first polarizer 140 is located, and the orthographic projection of the first liquid crystal particle L1 on the first polarizer 140 intersects with the absorption axis A1 of the first polarizer 140 and has an acute angle α. The acute angle α between the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 and the absorption axis A1 of the first polarizer 140 is 40° to 50°. The acute angle α between the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 and the absorption axis A1 of the first polarizer 140 is 40° to 50°, for example, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49° or 50°, etc. In the present application, the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 is located at the position after the absorption axis A1 of the first polarizer 140 is rotated 40° to 50° in the clockwise direction, or the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 is located at the position after the absorption axis A1 of the first polarizer 140 is rotated 40° to 50° in the counterclockwise direction.

[0039] In the present application, the absorption axis A1 of the first polarizer 140 and the absorption axis A2 of the second polarizer 110 can be measured using a spectrophotometer. Usually, the long side of the polarizer is used as a reference, and the angle between the absorption axis of the polarizer and the long side of the polarizer is defined as the angle of the absorption axis of the polarizer. The measurement principle is: the polarizer has a polarizing effect. When the polarization direction of the light from the polarized light source is consistent with the absorption axis of the polarizer, the transmittance of the light is the lowest; when the polarization direction of the light deviates from the absorption axis of the polarizer, the transmittance increases. Therefore, the direction of the absorption axis of the polarizer can be determined by rotating the polarizer and detecting the transmittance of the light. The measurement steps include: taking the position of the long side of the polarizer at the initial position (usually the long side, the long side is taken as an example here, and the wide side can also be used in actual measurement) as a reference line, rotating the polarizer under the illumination of a polarized light source to change the angle between the long side of the polarizer and the reference line, and detecting the brightness of the light passing through the polarizer at the same time; when the light transmittance is minimum, the absorption axis of the polarizer is consistent with the polarization direction of the light from the polarized light source. Since the polarization direction of the polarized light source of the test instrument is known, the angle of the absorption axis of the polarizer can be measured.

[0040] The display module 100 provided in the embodiment of the present application includes a display panel 130, a first polarizer 140 disposed on the light incident side of the display panel 130, a second polarizer 110 disposed on the light exiting side, and a polarization conversion layer 120 disposed between the first polarizer 140 and the second polarizer 110. The polarization conversion layer 120 can adjust the polarization direction of light. The polarization conversion layer 120 includes a second liquid crystal layer 121, and the orthographic projection of the long axis I of the first liquid crystal particle L1 in the second liquid crystal layer 121 on the first polarizer 140 intersects with the absorption axis A1 of the first polarizer 140 and has an acute angle α of 40° to 50°. The polarization direction of the light passing through the first polarizer 140 changes by about 90° through the polarization conversion layer 120, so that the absorption axis A2 of the second polarizer 110 can be set to be parallel to the absorption axis A1 of the first polarizer 140. Then the long sides of the first polarizer 140 and the second polarizer 110 are parallel to the length direction of the polarizer roll 200, so as to maximize the size specifications of the first polarizer 140 and the second polarizer 110, which is conducive to the realization of an ultra-large-sized liquid crystal display module 100.

[0041] The display module 100 has two working states, a dark state and a bright state. When the display module 100 is in the working state, the first liquid crystal particles L1 in the polarization conversion layer 120 always maintain a flip angle, that is, the acute angle α between the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 and the absorption axis A1 of the first polarizer 140 is 40° to 50°.

[0042] Preferably, the acute angle between the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 and the absorption axis A1 of the first polarizer 140 is 45°. In the present embodiment, it is 45°, and at this time, the polarization conversion layer 120 can greatly increase the proportion of the light passing through it that is deflected by 90°, so that the polarization direction of the light propagating to the second polarizer 110 is exactly consistent with the absorption axis A2 of the second polarizer 110 and is absorbed, thereby improving the absorption rate, or the light is exactly perpendicular to the absorption axis A2 of the second polarizer 110 and is transmitted, thereby improving the utilization rate of the light.

[0043] In this embodiment, the polarization conversion layer 120 is disposed between the first polarizer 140 and the display panel 130 .

[0044] The following is Figure 3 and Figure 4 The figure shows the light propagation of the display module 100 of the first embodiment in the dark state and the bright state. Figure 3As shown, the display module 100 also includes a backlight module, and the first liquid crystal layer also includes a second liquid crystal particle L2. The backlight module is arranged on the side of the first polarizer 140 away from the display panel 130 to provide a light source for the display panel 130. The light emitted by the backlight module passes through the first polarizer 140, the polarization conversion layer 120, the display panel 130 and the second polarizer 110 in sequence. The second liquid crystal particle L2 of the first liquid crystal layer in the dark state does not deflect, so the polarization direction of the linear polarized light passing through the first liquid crystal layer does not change. The light emitted by the backlight module includes polarized light with a first polarization direction and polarized light with a second polarization direction. In the embodiment of the present application, the first polarization direction is a vertical direction (90°), and the second polarization direction is a horizontal direction (0°). The angle between the absorption axis A1 of the first polarizer 140 and the long side of the first polarizer 140 is 0°, and the angle between the absorption axis A2 of the second polarizer 110 and the long side of the second polarizer 110 is 0°. Therefore, the light emitted by the backlight module passes through the first polarizer 140, and the light whose polarization direction is parallel to the absorption axis A1 (0°) of the first polarizer 140 is absorbed, that is, the light of the second polarization direction (0°) is absorbed, and the light of the first polarization direction (90°) passes through the first polarizer 140. The light of the first polarization direction (90°) passes through the polarization conversion layer 120, and the polarization direction is deflected by 90°, that is, the light of the first polarization direction (90°) is converted into the light of the second polarization direction (0°) and emitted. Since the second liquid crystal particles L2 in the first liquid crystal layer are not deflected, the light of the second polarization direction (0°) emitted through the polarization conversion layer 120 does not change the polarization direction through the first liquid crystal layer, and maintains the second polarization direction (0°) and propagates to the second polarizer 110. Since the polarization direction is parallel to the absorption axis A2 (0°) of the second polarizer 110, the light of the second polarization direction (0°) is absorbed by the second polarizer 110, and the display module 100 presents a dark state display.

[0045] like Figure 4As shown, the second liquid crystal particles L2 of the first liquid crystal layer in the bright state are deflected, and the polarization direction of the linear polarized light passing through the first liquid crystal layer is deflected by 90°. Therefore, the light emitted by the backlight module passes through the first polarizer 140, and the light with a polarization direction parallel to the absorption axis A1 (0°) of the first polarizer 140 is absorbed, that is, the light with the second polarization direction (0°) is absorbed, and the light with the first polarization direction (90°) passes through the first polarizer 140. The light with the first polarization direction (90°) passes through the polarization conversion layer 120, and the polarization direction is deflected by 90°, that is, the light with the first polarization direction (90°) is converted into the light with the second polarization direction (0°) and emitted. Since the second liquid crystal particles L2 in the first liquid crystal layer are deflected, the light with the second polarization direction (0°) emitted through the polarization conversion layer 120 changes its polarization direction through the first liquid crystal layer, and the light deflected to the first polarization direction (90°) is propagated to the second polarization film 110. Since the polarization direction of the light propagating to the second polarizer 110 is perpendicular to the absorption axis A2 (0°) of the second polarizer 110 , the light in the first polarization direction (90°) can be emitted through the second polarizer 110 , and the display module 100 presents a bright display.

[0046] Optionally, in some other embodiments, the polarization conversion layer 120 is disposed between the second polarizer 110 and the display panel 130 .

[0047] In this embodiment, the angle between the absorption axis A1 of the first polarizer 140 and the long side of the first polarizer 140 is 0°. The angle between the absorption axis A2 of the second polarizer 110 and the long side of the second polarizer 110 is 0°.

[0048] In this embodiment, the first polarizer 140 and the second polarizer 110 are cut from a polarizer roll 200 and then attached to both sides of the display panel 130. Figure 5 Generally speaking, the absorption axis of the polarizer roll 200 is parallel to its length direction. Taking the length direction of the polarizer roll 200 as a reference, the absorption axis direction of the polarizer roll 200 when fully unfolded is 0°. When the long side of the polarizer is parallel to the length direction of the polarizer roll 200, the absorption axis of the cut polarizer is 0°. Figure 5 The polarizer cutting method on the right side of the middle. When the wide side of the polarizer is parallel to the length direction of the polarizer roll 200, the absorption axis of the cut polarizer is 90°. Figure 6 The polarizer cutting method on the left side in the middle. That is, the first polarizer 140 and the second polarizer 110 of this embodiment are cut with the length direction of the polarizer roll 200 as the long side, and the angle between the absorption axis A1 of the first polarizer 140 and the long side of the first polarizer 140 is 0°, and the angle between the absorption axis A2 of the second polarizer 110 and the long side of the second polarizer 110 is 0°.

[0049] Limited by the width of the polarizer roll 200 and the cutting equipment, the maximum cutting width of the polarizer manufacturer is 2530 millimeters (mm), and the effective width is 2460mm. Taking the 130-inch ultra-large size LCD display module 100 as an example, the 130-inch display module 100 in the traditional technology requires the upper polarizer absorption axis to be 0°, and the aspect ratio of the size specification is 2878mm:1619mm; the lower polarizer absorption axis is 90°, and the aspect ratio of the size specification is 2878mm:1619mm. At present, the production line equipment of the polarizer manufacturer cannot cut out a lower polarizer with an absorption axis of 90° and a length greater than 2530mm from the polarizer roll 200, which obviously cannot meet the size specifications of the lower polarizer with an absorption axis of 90° and a length of 2878mm required by the traditional 130-inch display module 100.

[0050] In the present application, due to the setting of the polarization conversion layer 120, the first polarizer 140 and the second polarizer 110 can both be polarizers with a 0° absorption axis, that is, the first polarizer 140 and the second polarizer 110 can both be a one-piece size with a length greater than 2530 mm. For example, the length of the first polarizer 140 can be 2530 mm, 2600 mm, 2650 mm, 2730 mm, 2786 mm, 2800 mm, 2878 mm, etc., and the length of the second polarizer 110 can be 2530 mm, 2600 mm, 2650 mm, 2730 mm, 2786 mm, 2800 mm, 2878 mm, etc., so that the present application can realize a 130-inch large-scale display module 100, or form other ultra-large-size display modules 100 with a width of less than 2530 mm and a length greater than 2530 mm. Specifically, in the present embodiment, the length-to-width ratio of the first polarizer 140 is 2878 mm:1619 mm, and the length-to-width ratio of the second polarizer 110 is 2878 mm:1619 mm.

[0051] Optionally, in some other embodiments, the first polarizer 140 and the second polarizer 110 can also be cut to have absorption axes at other angles and lengths and widths at other specifications to realize a large, medium or small display module 100. As long as the absorption axis A1 of the first polarizer 140 and the absorption axis A2 of the second polarizer 110 are parallel, the display module 100 provided with the polarization conversion layer 120 can realize a dark state and a bright state. For example, the absorption axes A2 of the first polarizer 140 and the second polarizer 110 are both 90°, and the length and width of the first polarizer 140 and the second polarizer 110 are both less than 2530 mm.

[0052] In this embodiment, the polarization conversion layer 120 further includes a substrate layer 123 and an alignment layer 122. Figure 6As shown, the alignment layer 122 is arranged on one side of the substrate layer 123, and the second liquid crystal layer 121 is arranged on the side of the alignment layer 122 away from the substrate layer 123. The substrate layer 123 can be made of triacetyl cellulose (TAC), polyethylene terephthalate (PET) or polymethyl methacrylate (PMMA). The material of the alignment layer 122 is polyimide (PI), and the alignment angle of the alignment layer 122 is 45°, where the alignment angle of 45° refers to the angle of 45° with the outgoing light of the second polarizer 110.

[0053] The steps of preparing the polarization conversion layer 120 include: coating a polyimide solution on the substrate layer 123, irradiating with polarized ultraviolet light, forming an alignment layer 122 with an alignment angle of 45°; coating the first liquid crystal particles L1 on the alignment layer 122 and curing it to form the second liquid crystal layer 121, and completing the preparation of the polarization conversion layer 120. The first liquid crystal particles L1 are arranged regularly along the alignment direction by the arrangement of the alignment layer 122. When the polarization conversion layer 120 is attached to the light incident side of the display panel 130 and the first polarizer 140 is attached to the light incident side of the polarization conversion layer 120, the orthographic projection of the long axis of the first liquid crystal particle L1 on the first polarizer 140 intersects with the absorption axis A1 of the first polarizer 140, and the acute angle α between the orthographic projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 and the absorption axis A1 of the first polarizer 140 is 45°.

[0054] In this embodiment, the first liquid crystal particles L1 are positive liquid crystal particles. The first liquid crystal particles L1 are arranged in a first direction n x The refractive index of the first liquid crystal particle L1 in the second direction n is greater than that of the first liquid crystal particle L1 in the second direction n y The first liquid crystal particle L1 has a refractive index in the third direction n z The refractive index of the first liquid crystal particle L1 in the second direction n is equal to y The refractive index on the x >n y =n z . The first direction n x is the propagation direction of the light, the first direction n x , the second direction n y and third party z The first direction n x The second direction n is perpendicular to the plane where the polarization conversion layer 120 is located. y and third party z They are all parallel to the plane where the polarization conversion layer 120 is located.

[0055] It should be noted that the liquid crystal particles are optically anisotropic, that is, the refractive index of light in different directions is different. Light waves can be divided into two polarization types: ordinary light (O light) and extraordinary light (E light). Since the first liquid crystal particle L1 has refractive anisotropy, that is, the refractive index n x >n y =n z , when the angle between the polarization direction of the incident light incident on the polarization conversion layer 120 and the long axis of the first liquid crystal particle L1 is 45°, the phase difference between the O light and the E light of the outgoing light can be made to be 1 / 2 wavelength (λ), so that the phase of the outgoing light is deflected by 90° compared with the incident light, that is, the outgoing light changes from the first polarization direction of vertical vibration to the second polarization direction of horizontal vibration. It should be noted that the light emitted by the backlight module passes through the first polarizer 140, and the light with a polarization direction parallel to the absorption axis A1 (0°) of the first polarizer 140 is absorbed, that is, the light with the second polarization direction (0°) is absorbed, and the light with the first polarization direction (90°) passes through the first polarizer 140 to the polarization conversion layer 120. Therefore, the angle between the polarization direction of the incident light incident on the polarization conversion layer 120 and the long axis of the first liquid crystal particle L1 is 45°.

[0056] In this embodiment, the thickness of the second liquid crystal layer 121 is 260 nanometers (nm) to 300 nanometers. Optionally, the thickness of the second liquid crystal layer 121 can be 260nm, 270nm, 280nm, 290nm or 300nm. The thickness of the second liquid crystal layer 121 satisfies Δnd=1 / 2λ, where Δn is the difference between the refractive index of the second liquid crystal layer 121 for O light and the refractive index for E light, d is the thickness of the second liquid crystal layer 121, and λ is the wavelength of visible light. In this embodiment, Δn of the first liquid crystal particle L1 is 0.1 to 0.13. In order to achieve a phase difference of 1 / 2λ, the thickness d of the second liquid crystal layer 121 ranges from 260nm to 300nm.

[0057] Please refer to Figures 7 to 10 The display module 100 provided in the second embodiment of the present application is substantially the same as the display module 100 provided in the first embodiment, except for the position of the polarization conversion layer 120 in the display module 100 and the structure of the polarization conversion layer 120 .

[0058] like Figure 7 As shown, in this embodiment, the polarization conversion layer 120 is disposed between the second polarizer 110 and the display panel 130 .

[0059] like Figure 8As shown, the display module 100 further includes a backlight module, and the first liquid crystal layer further includes second liquid crystal particles L2. The backlight module is disposed on a side of the first polarizer 140 away from the display panel 130 to provide a light source for the display panel 130. The light emitted by the backlight module passes through the first polarizer 140, the display panel 130, the polarization conversion layer 120, and the second polarizer 110 in sequence.

[0060] The second liquid crystal particles L2 of the first liquid crystal layer in the dark state do not deflect, so the polarization direction of the linear polarized light passing through the first liquid crystal layer does not change. The light emitted by the backlight module passes through the first polarizer 140, and the light with a polarization direction parallel to the absorption axis A1 (0°) of the first polarizer 140 is absorbed, that is, the light with the second polarization direction (0°) is absorbed, and the light with the first polarization direction (90°) passes through the first polarizer 140. The light with the first polarization direction (90°) propagates to the first liquid crystal layer. Since the second liquid crystal particles L2 in the first liquid crystal layer do not deflect, the light with the first polarization direction (90°) emitted through the first polarizer 140 does not change the polarization direction through the first liquid crystal layer, and maintains the first polarization direction (90°) to propagate to the polarization conversion layer 120. The light with the first polarization direction (90°) propagates to the polarization conversion layer 120, and the polarization direction is deflected by 90°, that is, the light with the first polarization direction (90°) is converted into the light with the second polarization direction (0°) and emitted. The light in the second polarization direction (0°) is emitted to the second polarizer 110. Since the polarization direction is parallel to the absorption axis A2 (0°) of the second polarizer 110, the light in the second polarization direction (0°) is absorbed by the second polarizer 110, and the display module 100 displays in a dark state.

[0061] like Fig. 9As shown, the second liquid crystal particles L2 of the first liquid crystal layer in the bright state are deflected, and the polarization direction of the linear polarized light passing through the first liquid crystal layer is deflected by 90°. Therefore, the light emitted by the backlight module passes through the first polarizer 140, and the light with a polarization direction parallel to the absorption axis A1 (0°) of the first polarizer 140 is absorbed, that is, the light with the second polarization direction (0°) is absorbed, and the light with the first polarization direction (90°) passes through the first polarizer 140. The light with the first polarization direction (90°) is emitted to the first liquid crystal layer. Due to the deflection of the second liquid crystal particles L2 in the first liquid crystal layer, the polarization direction of the light with the first polarization direction (90°) is changed through the first liquid crystal layer, and the light is deflected to the second polarization direction (0°) and propagates to the polarization conversion layer 120. The light with the second polarization direction (0°) propagates to the polarization conversion layer 120, and the polarization direction is deflected by 90°, that is, the light with the second polarization direction (0°) is converted into the light with the first polarization direction (90°) and is emitted to the second polarizer 110. Since the polarization direction of the light propagating to the second polarizer 110 is perpendicular to the absorption axis A2 (0°) of the second polarizer 110 , the light in the first polarization direction (90°) can be emitted through the second polarizer 110 , and the display module 100 presents a bright display.

[0062] In this embodiment, the polarization conversion layer 120 further includes a first electrode 124 and a second electrode 125. Fig.10 As shown, the first electrode 124 is located on one side of the second liquid crystal layer 121, and the second electrode 125 is located on the side of the second liquid crystal layer 121 away from the first electrode 124. The dielectric anisotropy of the liquid crystal is used to make the first liquid crystal particle L1 flip under the action of the electric field, so that the acute angle α between the positive projection of the long axis I of the first liquid crystal particle L1 on the first polarizer 140 and the absorption axis A1 of the first polarizer 140 is 40° to 50°. Optionally, the first liquid crystal particle L1 can be a positive liquid crystal particle or a negative liquid crystal particle.

[0063] Optionally, the first electrode 124 includes a plurality of first sub-electrodes arranged in an array, and the second electrode 125 includes a plurality of second sub-electrodes arranged in an array (not shown), and a first sub-electrode is arranged corresponding to a second sub-electrode. The first sub-electrode and the second sub-electrode are both strip electrodes. It can be understood that the edge electric field of the whole surface electrode is stronger than the middle electric field of the whole surface electrode. Setting the first electrode 124 as a plurality of first sub-electrodes arranged in an array and setting the second electrode 125 as a plurality of second sub-electrodes arranged in an array can further uniformize the electric field between the first electrode 124 and the second electrode 125, so that the first liquid crystal particle L1 between the first electrode 124 and the second electrode 125 is more uniformly deflected. Optionally, the spacing between the plurality of first sub-electrodes is equal, and the spacing between the plurality of second sub-electrodes is equal, so that the electric field between the first electrode 124 and the second electrode 125 is more uniform.

[0064] The display module provided by the embodiment of the present application includes a display panel, a first polarizer arranged on the light incident side of the display panel, a second polarizer arranged on the light exit side, and a polarization conversion layer arranged between the first polarizer and the second polarizer. The polarization conversion layer can play a role in adjusting the polarization direction of light. The polarization conversion layer includes a second liquid crystal layer, and the orthographic projection of the long axis of the first liquid crystal particle in the second liquid crystal layer on the first polarizer intersects with the absorption axis of the first polarizer and has an acute angle of 40° to 50°. The polarization direction of the light passing through the first polarizer changes by about 90° through the polarization conversion layer, so that the absorption axis of the second polarizer can be set to be parallel to the absorption axis of the first polarizer, then the long sides of the first polarizer and the second polarizer are parallel to the length direction of the polarizer coil, so as to maximize the size specifications of the first polarizer and the second polarizer, which is conducive to the realization of an ultra-large liquid crystal display module.

[0065] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A display module, characterized in that: The display module comprises: A display panel, the display panel having a light incident side and a light exiting side, the display panel comprising a first liquid crystal layer; A first polarizer, arranged on the light incident side of the display panel; A second polarizer is arranged on the light-emitting side of the display panel, and the absorption axis of the first polarizer is parallel to the absorption axis of the second polarizer; A polarization conversion layer is arranged between the first polarizer and the second polarizer, the polarization conversion layer includes a second liquid crystal layer, the second liquid crystal layer includes first liquid crystal particles, in a working state, the long axis of the first liquid crystal particle is parallel to the plane where the first polarizer is located, the orthographic projection of the long axis of the first liquid crystal particle on the first polarizer intersects with the absorption axis of the first polarizer, and the acute angle between the orthographic projection of the long axis of the first liquid crystal particle on the first polarizer and the absorption axis of the first polarizer is 40° to 50°.

2. The display module according to claim 1, characterized in that: The acute angle between the orthographic projection of the long axis of the first liquid crystal particle on the first polarizer and the absorption axis of the first polarizer is 45°.

3. The display module according to claim 1, characterized in that: The polarization conversion layer is disposed between the first polarizer and the display panel, or the polarization conversion layer is disposed between the second polarizer and the display panel.

4. The display module according to claim 1, characterized in that: The polarization conversion layer further includes a substrate layer and an alignment layer. The alignment layer is arranged on one side of the substrate layer, and the second liquid crystal layer is arranged on a side of the alignment layer away from the substrate layer.

5. The display module according to claim 4, characterized in that: The first liquid crystal particles are positive liquid crystal particles, the refractive index of the first liquid crystal particles in a first direction is greater than the refractive index of the first liquid crystal particles in a second direction, the refractive index of the first liquid crystal particles in a third direction is equal to the refractive index of the first liquid crystal particles in the second direction, the first direction, the second direction and the third direction are perpendicular to each other, and the first direction is perpendicular to the plane where the polarization conversion layer is located.

6. The display module according to claim 5, characterized in that: The thickness of the second liquid crystal layer is 260 nanometers to 300 nanometers.

7. The display module according to claim 1, characterized in that: The polarization conversion layer further includes a first electrode and a second electrode. The first electrode is located on one side of the second liquid crystal layer, and the second electrode is located on a side of the second liquid crystal layer away from the first electrode.

8. The display module according to claim 7, characterized in that: The first electrode includes a plurality of first sub-electrodes arranged in an array, the second electrode includes a plurality of second sub-electrodes arranged in an array, and one first sub-electrode is disposed correspondingly to one second sub-electrode.

9. The display module according to claim 1, characterized in that: The angle between the absorption axis of the first polarizer and the long side of the first polarizer is 0°, and the angle between the absorption axis of the second polarizer and the long side of the second polarizer is 0°.

10. The display module according to any one of claims 1 to 9, characterized in that: The length of the first polarizer is greater than 2530 mm, and the length of the second polarizer is greater than 2530 mm.

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