Quantum rod thin film and display device

Abstract

This invention relates to a quantum rod thin film and a display device. The quantum rod thin film includes two transparent substrates disposed opposite each other, a polymer solution filled between the two transparent substrates, and a plurality of quantum rods disposed in the polymer solution. The quantum rods have a first alignment direction and a second alignment direction. A transparent electrode is provided on one of the transparent substrates, and at least some of the quantum rods are driven by the transparent electrode to switch between the first alignment direction and the second alignment direction. This invention employs a structure that changes the alignment direction of the quantum rods by applying an electric field to the transparent electrode. By applying a voltage signal to the transparent electrode, the alignment direction of the quantum rods can be precisely adjusted, enabling switching between wide and narrow viewing angles, improving overall adjustment accuracy, and facilitating operation.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, and in particular to a quantum rod thin film and display device. Background Technology

[0002] With continuous breakthroughs in LCD technology, the viewing angle of modern displays has expanded from the traditional 120° horizontal angle to over 160°, with some high-end products even achieving a 270° panoramic viewing effect. While this technological evolution enhances the value of immersive viewing experiences and collaborative office scenarios, it also exposes deep-seated hidden dangers in the field of commercial information security. When screen information is disseminated indiscriminately across a wide viewing angle, issues such as competitors spying from the side and information leaks in public places frequently occur, resulting in annual losses exceeding $2 million for companies due to the leakage of trade secrets (according to Gartner research data in 2023). Currently, the consumer electronics field is facing dual demands: meeting the wide viewing angle requirements for shared content among multiple users in mobile office scenarios, while also providing privacy protection functions for one-way viewing in specific scenarios such as financial transactions and confidential document processing. This is driving the evolution of display devices towards intelligent viewing angle switching technology.

[0003] Mainstream display devices are accelerating their deployment of multi-scenario adaptability. Smartphones need to balance privacy protection during subway commutes and multi-person video conferences in coffee shops, while business laptops need to meet the needs of all-person presentations in conference rooms and prevent the leakage of financial data during executive meetings. Existing technologies mainly offer two solutions: one is a physical shielding solution, which achieves viewing angle control by attaching a louvered optical film to the display surface. While this method can compress the horizontal viewing angle to within 30°, it suffers from drawbacks such as cumbersome use (repeated pasting / removing), reduced light transmittance (average reduction of 15-20%), and lack of dynamic adjustment. Furthermore, a single film only supports a fixed viewing angle mode. The other is intelligent viewing adjustment technology based on electro-controlled liquid crystal orientation. This involves placing viewing angle control electrodes on the color filter (CF) substrate side and applying a vertical electric field to cause liquid crystal molecules to tilt at angles of 90° to 180°, deflecting the liquid crystal in the vertical direction. This creates an optical waveguide interference effect to limit the lateral viewing range, achieving a narrow viewing angle mode. By controlling the voltage on the viewing angle control electrodes, switching between wide and narrow viewing angles can be achieved. Experiments have shown that this solution can achieve a continuously adjustable viewing angle of 50°-160°, but it has problems such as decreased contrast (ΔEN≥30%) and response delay (>100ms) in wide viewing angle mode. In particular, it is prone to color banding when displaying dynamic images, resulting in an unsatisfactory wide viewing angle of the display panel.

[0004] Therefore, there is a need for a quantum rod film and display device that can switch between wide-viewing-angle and narrow-viewing-angle modes without repeatedly pasting or tearing the louvered optical film, is easy to use, can meet the wide-viewing-angle needs of all staff demonstrations, and can also meet the privacy protection needs of customers, and is suitable for multiple scenarios and has high security. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a quantum rod thin film and a display device.

[0006] The technical solution of this utility model is as follows:

[0007] A quantum rod thin film includes two transparent substrates disposed opposite each other, a polymer solution filled between the two transparent substrates, and a plurality of quantum rods disposed in the polymer solution. The quantum rods have a first alignment direction and a second alignment direction. A transparent electrode is provided on one of the transparent substrates, and at least a portion of the quantum rods are driven by the transparent electrode to switch between the first alignment direction and the second alignment direction.

[0008] As a further improvement of this utility model, multiple transparent electrodes are provided, the multiple transparent electrodes are evenly distributed, and there is a gap between adjacent transparent electrodes, the distance between adjacent transparent electrodes is 30-60um.

[0009] As a further improvement of this invention, the quantum rod includes a body made of semiconductor material and electric field sensing groups disposed on the surface of the body.

[0010] A display device includes a backlight, a liquid crystal display cell, and a quantum rod film as described above, wherein the quantum rod film is disposed on one side of the liquid crystal display cell.

[0011] As a further improvement of this utility model, the quantum rod film is disposed between the backlight and the display liquid crystal cell, and the display liquid crystal cell includes a lower polarizer connected to the quantum rod film, wherein the first arrangement direction is parallel to the absorption axis direction of the lower polarizer.

[0012] As a further improvement of this utility model, the second arrangement direction is orthogonal to the absorption axis direction of the lower polarizer.

[0013] As a further improvement of this utility model, the quantum rod film is disposed on the side of the display liquid crystal cell away from the backlight, and the display liquid crystal cell includes an upper polarizer connected to the quantum rod film, wherein the first arrangement direction is parallel to the absorption axis direction of the upper polarizer.

[0014] As a further improvement of this utility model, an optically transparent adhesive is provided between the display liquid crystal cell and the quantum rod film. The thickness of the optically transparent adhesive is A, and the thickness of the transparent substrate in contact with the optically transparent adhesive is B, where A+B≥100um.

[0015] As a further improvement of this utility model, the quantum rod thin film is disposed between the backlight and the display liquid crystal cell. The display liquid crystal cell includes an array substrate, which is the same substrate as a transparent substrate. A metal grid is provided on the side of the array substrate away from the quantum rod thin film, and the first arrangement direction is parallel to the polarization direction of the metal grid.

[0016] As a further improvement of this utility model, the quantum rod thin film is disposed on the side of the display liquid crystal cell away from the backlight. The display liquid crystal cell includes a color filter substrate, which is the same substrate as a transparent substrate. A metal grid is provided on the side of the color filter substrate away from the quantum rod thin film, and the first arrangement direction is parallel to the polarization direction of the metal grid.

[0017] According to the above-described solution, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model adopts a structure that changes the alignment direction of quantum rods by applying an electric field to transparent electrodes. By applying a voltage signal to the transparent electrodes, the alignment direction of quantum rods can be precisely adjusted, improving the overall adjustment accuracy and making the operation convenient.

[0019] 2. This utility model uses a quantum rod film combined with the display LCD cell to replace the conventional louvered optical film. During use, it can achieve the switching between wide viewing angle mode and narrow viewing angle mode without repeatedly pasting or tearing the louvered optical film, which is convenient to use. At the same time, it can also protect the display LCD cell to a certain extent, avoiding unnecessary scratches or damage to the display LCD cell caused by repeatedly pasting or tearing the louvered optical film, thus improving the safety of use.

[0020] 3. In wide viewing angle mode, no voltage signal is applied to the transparent electrode. At this time, the quantum rods in the quantum rod film are all arranged in the first alignment direction, which does not block or affect the light path entering and exiting the display liquid crystal cell. Thus, the display panel has a wide viewing angle. In narrow viewing angle mode, a voltage signal is applied to the transparent electrode, and the transparent electrode generates a horizontal electric field around it. Since the quantum rods have electric field sensing groups, some quantum rods rotate in the second alignment direction under the action of the horizontal electric field. The rotating quantum rods block the light path entering and exiting the display liquid crystal cell, forming a light-blocking grating. This can block the light path of a larger viewing angle, that is, the display panel has a narrow viewing angle. This can meet the wide viewing angle requirements of full-person demonstrations and also meet the customer's privacy protection requirements. It is suitable for multiple scenarios and has high security.

[0021] 4. This utility model applies voltage signals of different degrees to a transparent electrode, and changes the arrangement of quantum rods inside the quantum rod film by changing the voltage. This allows the arrangement direction of the quantum rods to be adjusted between a first arrangement direction and a second arrangement direction, thereby achieving precise adjustment of the viewing angle, improving the diversity and adjustability of the viewing angle, and expanding the scope of application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the quantum rod thin film of this utility model from the first angle;

[0023] Figure 2 This is a schematic diagram of the quantum rod thin film of this utility model from the second angle.

[0024] Figure 3 This is a schematic diagram of the structure of the first embodiment of the display device of this utility model;

[0025] Figure 4 This is a schematic diagram of the optical path with a wide viewing angle in the first embodiment of the display device of this utility model;

[0026] Figure 5 This is a schematic diagram of the optical path for a narrow viewing angle in the first embodiment of the display device of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the second embodiment of the display device of this utility model;

[0028] Figure 7 This is a structural schematic diagram of the third embodiment of the display device of this utility model;

[0029] Figure 8 This is a structural schematic diagram of the fourth embodiment of the display device of this utility model.

[0030] In the diagram: 1. Backlight; 2. Display LCD cell; 21. Lower polarizer; 22. Upper polarizer; 23. Array substrate; 24. Metal grid; 25. Color filter substrate; 3. Quantum rod film; 31. Transparent substrate; 32. Polymer solution; 33. Quantum rod; 34. Transparent electrode; 4. Optical transparent adhesive; 5. Optical path. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] See Figure 1 and Figure 2This invention provides a quantum rod film 3, comprising two transparent substrates 31 disposed opposite to each other, a polymer solution 32 filled between the two transparent substrates 31, and a plurality of quantum rods 33 disposed within the polymer solution 32. The material of the transparent substrates 31 is not limited. The quantum rods 33 have a first arrangement direction and a second arrangement direction. A transparent electrode 34 is provided on one of the transparent substrates 31, generating a horizontal electric field. At least some of the quantum rods 33 are driven by the transparent electrode 34 to switch between the first and second arrangement directions. This invention employs a structure that changes the arrangement direction of the quantum rods 33 by applying an electric field to the transparent electrode 34. By applying a voltage signal to the transparent electrode 34, the arrangement direction of the quantum rods 33 can be precisely adjusted. Furthermore, by applying voltage signals of different degrees to the transparent electrode 34, the arrangement of the quantum rods 33 inside the quantum rod film 3 is changed through voltage variations, allowing the arrangement direction of the quantum rods 33 to be adjusted between the first and second arrangement directions. This achieves precise adjustment of the viewing angle, improves the diversity and adjustability of the viewing angle, expands the applicability, improves the overall adjustment accuracy, and is easy to operate.

[0035] In one embodiment of this invention, quantum rods 33 are distributed throughout the entire quantum rod film 3, and multiple transparent electrodes 34 are provided. These transparent electrodes 34 are distributed throughout the quantum rod film 3, ensuring that each location on the quantum rod film 3 has at least one transparent electrode 34 to change the arrangement direction of the quantum rods 33 at that location. The uniform distribution of the multiple transparent electrodes 34 improves the uniformity of the quantum rod film 3, ensuring that the horizontal electric field intensity is the same or has no significant difference throughout the quantum rod film 3. This also avoids the phenomenon of excessively dense or sparse transparent electrodes 34 in any particular location. Furthermore, gaps are provided between adjacent transparent electrodes 34, allowing the quantum rods 33 near the transparent electrodes 34 to rotate under the influence of the horizontal electric field. The quantum rods 33 at the gaps are not affected by the horizontal electric field, so they do not rotate and remain stable. Preferably, the distance between adjacent transparent electrodes 34 is 30-60 μm. The distance between adjacent transparent electrodes 34 should be controlled within a reasonable range. This avoids the situation where the distance between adjacent transparent electrodes 34 is too small, resulting in too many quantum rods 33 rotating in the horizontal electric field, which would greatly reduce the overall light transmittance of the quantum rod film 3. It also avoids the situation where the distance between adjacent transparent electrodes 34 is too large, resulting in too many quantum rods 33 maintaining the first alignment direction in the horizontal electric field, which would make the light-shielding performance of the quantum rod film 3 unable to meet the usage requirements. The optimal distance between adjacent transparent electrodes 34 is 45 μm.

[0036] In one embodiment of this utility model, quantum rods 33 are only disposed near transparent electrodes 34, and no quantum rods 33 are disposed in the gaps between adjacent transparent electrodes 34. When a voltage is applied to the transparent electrodes 34, the horizontal electric field generated by the transparent electrodes 34 drives all quantum rods 33 to rotate. Since the quantum rods 33 disposed in the gaps do not rotate, the quantum rods 33 disposed in the gaps do not play any role. That is, compared with the above embodiment, this embodiment reduces the number of quantum rods 33, and the two achieve the same effect, effectively reducing the cost of use.

[0037] In one embodiment of this invention, the quantum rod 33 comprises a body made of semiconductor material and electric field-sensing groups disposed on the surface of the body. The body is a one-dimensional nanorod-shaped crystal, ellipsoidal in shape, typically composed of group II and group VI elements, with a stable length within 100 nm. Due to scale quantum effects and dielectric confinement effects, they possess unique photoluminescence properties. These properties are mainly characterized by size-dependent emission and absorption spectra, large Stokes shift, high quantum yield, and, being inorganic, resistance to chemical and biological degradation, photolysis, or bleaching, exhibiting strong stability. When the quantum rod is irradiated, it emits light of other colors. Because the nanocrystals of the quantum rod are rod-shaped and directional, the emitted light is polarized and can be directly used in liquid crystal displays. Preferably, the substrate comprises one or more semiconductor materials such as CdSe, CdTe, CdS, and ZnSe, that is, the substrate is composed of one or more semiconductor materials such as CdSe, CdTe, CdS, and ZnSe. The polymer solution 32 comprises an organic solution and additives, that is, the polymer solution 32 is a mixture of an organic solution and additives such as stabilizers. The organic solution does not react with the substrate. Preferably, the organic solution can be a solvent that does not react with the quantum rod 33, such as diethylene glycol methyl ethyl ether, methyl ethyl ketone, or methyl isobutyl ketone. Preferably, the surface of the substrate is transparent. The surface of the quantum rods 33 is modified by methods such as chelation, grafting, and ligand exchange to have electric field effect groups. Metal ion groups, polar groups, or other electric field effect groups can be used, as long as the groups can move in the electric field. When no voltage is applied to the transparent electrode 34, that is, when the transparent electrode 34 does not generate an electric field, all the quantum rods 33 are oriented in the first alignment direction to achieve complete light transmission. When a voltage is applied to the transparent electrode 34, that is, when the transparent electrode 34 generates an electric field, the quantum rods 33 affected by the electric field rotate in the second alignment direction to achieve light polarization and light blocking functions.

[0038] The existing display device includes a display liquid crystal cell 2 and a backlight 1. The display liquid crystal cell 2 includes a lower polarizer 21, an array substrate 23, a liquid crystal component, a pixel component, a color filter substrate 25, and an upper polarizer 22 arranged in order from near to far from the backlight 1. The light emitted from the backlight 1 enters the display liquid crystal cell 2 through the lower polarizer 21 and is finally emitted from the upper polarizer 22.

[0039] This utility model provides a display device, including a backlight 1, a display liquid crystal cell 2, and the aforementioned quantum rod film 3. The quantum rod film 3 is disposed on one side of the display liquid crystal cell 2. The display liquid crystal cell 2 is used to control the display of a normal image, and the quantum rod film 3 is used to control the switching between wide viewing angle mode and narrow viewing angle mode. The arrangement position of the quantum rod film 3 is versatile, allowing for selection of a suitable position according to specific usage requirements. Specifically, the quantum rod film 3 can be disposed on either the lower polarizer 21 or the upper polarizer 22, depending on the specific usage requirements. Regardless of whether it is disposed on the lower polarizer 21 or the upper polarizer 22, the quantum rod film 3... Both can adjust the range of the light path emitted by the display LCD cell 2 received by the user, that is, realize the switching between wide viewing angle mode and narrow viewing angle mode. In addition, this utility model uses a quantum rod film 3 combined with the display LCD cell 2 instead of the conventional louvered optical film. During use, the wide viewing angle mode and narrow viewing angle mode can be switched without repeatedly pasting or tearing the louvered optical film, which is convenient to use. At the same time, it can also protect the display LCD cell 2 to a certain extent, avoiding unnecessary scratches or damage to the display LCD cell 2 caused by repeatedly pasting or tearing the louvered optical film, thus improving the overall working stability and safety of use.

[0040] See Figure 3As an embodiment of this utility model, based on the aforementioned existing display device, the quantum rod film 3 is disposed between the backlight 1 and the display liquid crystal cell 2. The display liquid crystal cell 2 includes a lower polarizer 21 connected to the quantum rod film 3, that is, the quantum rod film 3 is disposed on the lower polarizer 21. The first arrangement direction of the quantum rods 33 is parallel to the absorption axis direction of the lower polarizer 21, and the second arrangement direction of the quantum rods 33 is arranged at a certain angle to the absorption axis direction of the lower polarizer 21. When no voltage is applied to the transparent electrode 34, all the quantum rods 33 are in an angled manner. In the first arrangement, all quantum rods 33 are parallel to the absorption axis of the lower polarizer 21, which is a wide-viewing-angle mode. When a voltage is applied to the transparent electrode 34, some quantum rods 33 rotate under the influence of the horizontal electric field. The quantum rods 33 that do not rotate remain parallel to the absorption axis of the lower polarizer 21, while the rotating quantum rods 33 are arranged at a certain angle to the absorption axis of the lower polarizer 21. Because there is an angle between the arrangement direction of the quantum rods 33 and the absorption axis of the lower polarizer 21, the quantum... The arrangement direction of the quantum rods 33 is not parallel to the absorption axis of the lower polarizer 21, so that the quantum rods 33 can obstruct and block the light path of the backlight 1 into the display liquid crystal cell 2 to a certain extent. This is the narrow viewing angle mode. Preferably, the second arrangement direction of the quantum rods 33 is orthogonal to the absorption axis of the lower polarizer 21, which can ensure that the blocking area of ​​the quantum rods 33 on the light path of the backlight 1 into the display liquid crystal cell 2 is maximized, thereby improving the light path blocking efficiency and quality. In addition, the voltage applied to the transparent electrode 34 can be adjusted. When a small voltage is applied, the horizontal electric field generated by the transparent electrode 34 is small, and the rotation angle of the quantum rods 33 is small. When the voltage is gradually increased, the horizontal electric field generated by the transparent electrode 34 also increases, and the rotation angle of the quantum rods 33 also increases. By adjusting the voltage applied to the transparent electrode 34, the rotation angle of the quantum rods 33 can be adjusted according to the user's specific needs, that is, the specific angle of the narrow viewing angle can be adjusted to meet the user's needs for the narrow viewing angle mode. Through the flexible adjustment of the narrow viewing angle, the overall applicability and usage flexibility can be further improved. The following example demonstrates the optical path of the wide-viewing-angle mode and narrow-viewing-angle mode of the display device, using the second arrangement direction of the quantum rod 33 as an example where the absorption axis of the lower polarizer 21 is orthogonal:

[0041] See Figure 4 This is a schematic diagram of the optical path in the wide viewing angle mode. All quantum rods 33 are parallel to the absorption axis of the lower polarizer 21. All quantum rods 33 do not block the light path of the backlight 1 into the display liquid crystal cell 2. The light path emitted from the backlight 1 enters the display liquid crystal cell 2 in a scattered manner and exits the display liquid crystal cell 2 in a scattered manner. The light path emits light with the maximum area. The quantum rod film 3 does not affect the light path of the backlight 1. That is, the quantum rod film 3 does not play any light-blocking function, thus achieving a wide viewing angle.

[0042] See Figure 5 This is a schematic diagram of the optical path in the narrow viewing angle mode. Some of the quantum rods 33 remain parallel to the absorption axis of the lower polarizer 21, while the other part of the quantum rods 33 is orthogonal to the absorption axis of the lower polarizer 21, forming a light-shielding grating. At this time, the quantum rods 33 that remain parallel to the absorption axis of the lower polarizer 21 still allow the light from the backlight 1 to enter the display liquid crystal cell 2 to pass through, while the quantum rods 33 that are orthogonal to the absorption axis of the lower polarizer 21 block the light from the backlight 1 to enter the display liquid crystal cell 2, thus playing a light-shielding role. Under the combined action of the two types of quantum rods 33, the wide-viewing-angle light path emitted by the backlight 1 is blocked, that is, the scattered light path emitted by the backlight 1 becomes a straight light path entering the display liquid crystal cell 2, and finally maintains a straight light path to exit from the display liquid crystal cell 2, thus achieving a narrow viewing angle.

[0043] In one embodiment of this utility model, an optically transparent adhesive 4 is provided between the display liquid crystal cell 2 and the quantum rod film 3. The thickness of the optically transparent adhesive 4 is A, and the thickness of the transparent substrate 31 in contact with the optically transparent adhesive 4 is B, where A+B≥100um. This ensures that there is a certain distance between the polymer solution 32 and the lower polarizer 21, ensuring the passage and polarization of the light path and improving the overall working stability and reliability. Preferably, the thickness A of the optically transparent adhesive 4 is 50um, and the thickness B of the transparent substrate 31 is 50um. Both the optically transparent adhesive 4 and the transparent substrate 31 have a certain thickness. This avoids the phenomenon that the adhesion between the display liquid crystal cell 2 and the quantum rod film 3 is too low due to the thickness of the optically transparent adhesive 4 being too small, which could lead to the quantum rod film 3 falling off. It also avoids the phenomenon that the mechanical strength of the transparent substrate 31 is too low due to the thickness of the transparent substrate 31 being too small, which could lead to the transparent substrate 31 breaking or being damaged. This further improves the connection strength between the quantum rod film 3 and the liquid crystal display cell 2, and also improves the overall working stability and safety of the display device.

[0044] See Figure 6As an embodiment of this utility model, based on the aforementioned existing display device, the quantum rod film 3 is disposed on the side of the display liquid crystal cell 2 away from the backlight 1. The display liquid crystal cell 2 includes an upper polarizer 22 connected to the quantum rod film 3, that is, the quantum rod film 3 is disposed on the upper polarizer 22. The first arrangement direction of the quantum rods 33 is parallel to the absorption axis direction of the upper polarizer 22, and the second arrangement direction of the quantum rods 33 is orthogonal to the absorption axis direction of the upper polarizer 22. When no voltage is applied to the transparent electrode 34, all the quantum rods 33 are arranged in the first arrangement direction, that is, all the quantum rods 33 are parallel to the absorption axis direction of the upper polarizer 22. This is a wide viewing angle mode. When a voltage is applied to the transparent electrode 34... Some of the quantum rods 33 rotate under the influence of the horizontal electric field. The quantum rods 33 that do not rotate remain parallel to the absorption axis of the upper polarizer 22, allowing the light emitted from the display liquid crystal cell 2 to pass through. The quantum rods 33 that rotate are orthogonal to the absorption axis of the upper polarizer 22, forming a light-shielding grating that blocks the light emitted from the display liquid crystal cell 2, thus achieving a light-shielding effect. The quantum rods 33 thus impede and block the light emitted from the display liquid crystal cell 2 to a certain extent. Under the combined action of the two types of quantum rods 33, the wide-viewing-angle light path emitted from the display liquid crystal cell 2 is blocked, that is, the scattered light path emitted from the display liquid crystal cell 2 becomes a straight light path, achieving a narrow viewing angle and realizing the function of viewing angle privacy.

[0045] As an embodiment of the present invention, the display device also includes a cover plate, and the quantum rod film 3 is made on the inner side of the cover plate and fully attached to the upper polarizer 22 of the display liquid crystal cell 2.

[0046] See Figure 7As an embodiment of this utility model, based on the existing display device described above, a quantum rod film 3 is disposed between the backlight 1 and the display liquid crystal cell 2. The display liquid crystal cell 2 includes an array substrate 23, which is the same substrate as a transparent substrate 31. A metal grid 24 is provided on the side of the array substrate 23 away from the quantum rod film 3, replacing the lower polarizer 21, which can save one substrate and reduce the thickness of the product. Preferably, the metal grid 24 is fabricated using nanoimprint technology. The first arrangement direction of the quantum rods 33 is parallel to the polarization direction of the metal grid 24, and the second arrangement direction of the quantum rods 33 is orthogonal to the polarization direction of the metal grid 24. When no voltage is applied to the transparent electrode 34, all the quantum rods 33 are arranged in the first arrangement direction, that is, all the quantum rods 33 are parallel to the polarization direction of the metal grid 24. At this time, it is a wide viewing angle mode. When a voltage is applied to the transparent electrode 34, some of the quantum rods 33 rotate under the action of the horizontal electric field. That is, the quantum rods 33 that do not rotate remain parallel to the polarization direction of the metal grid 24, and still allow the light path of the backlight 1 into the display liquid crystal cell 2 to pass through. The quantum rods 33 that rotate are orthogonal to the polarization direction of the metal grid 24, forming a light-shielding grid, which blocks the light path of the backlight 1 into the display liquid crystal cell 2, thus playing a light-shielding role. The quantum rods 33 can block and shield the light path of the backlight 1 into the display liquid crystal cell 2 to a certain extent. Under the combined action of the two quantum rods 33, the wide-angle light path emitted by the backlight 1 is blocked, that is, the scattered light path emitted by the backlight 1 becomes a straight light path into the display liquid crystal cell 2, and finally maintains a straight light path to exit from the display liquid crystal cell 2, thus achieving a narrow viewing angle and achieving the function of viewing angle privacy.

[0047] See Figure 8As an embodiment of this utility model, based on the existing display device described above, the quantum rod film 3 is disposed on the side of the display liquid crystal cell 2 away from the backlight 1. The display liquid crystal cell 2 includes a color filter substrate 25, which is the same substrate as a transparent substrate 31. A metal grid 24 is provided on the side of the color filter substrate 25 away from the quantum rod film 3. The first arrangement direction of the quantum rods 33 is parallel to the polarization direction of the metal grid 24, and the second arrangement direction of the quantum rods 33 is orthogonal to the polarization direction of the metal grid 24. When no voltage is applied to the transparent electrode 34, all the quantum rods 33 are arranged in the first arrangement direction, that is, all the quantum rods 33 are parallel to the polarization direction of the metal grid 24. This is a wide viewing angle mode. When a voltage is applied to electrode 34, some of the quantum rods 33 rotate under the influence of the horizontal electric field. The quantum rods 33 that do not rotate remain parallel to the polarization direction of the metal grid 24, still allowing the light emitted from the display liquid crystal cell 2 to pass through. The quantum rods 33 that rotate are orthogonal to the polarization direction of the metal grid 24, forming a light-shielding grid that blocks the light emitted from the display liquid crystal cell 2, thus achieving a light-shielding effect. The quantum rods 33 thus impede and block the light emitted from the display liquid crystal cell 2 to a certain extent. Under the combined action of the two types of quantum rods 33, the wide-angle light path emitted from the display liquid crystal cell 2 is blocked, that is, the scattered light path emitted from the display liquid crystal cell 2 becomes a straight light path, achieving a narrow viewing angle and realizing the function of viewing angle privacy.

[0048] In summary, this utility model provides a quantum rod thin film and a display device. It employs a structure that changes the arrangement direction of quantum rods 33 by applying an electric field to a transparent electrode 34. By applying a voltage signal to the transparent electrode 34, the arrangement direction of the quantum rods 33 can be precisely adjusted. Furthermore, by applying voltage signals of varying degrees to the transparent electrode 34, the arrangement of the quantum rods 33 within the quantum rod thin film 3 is altered through voltage changes, allowing the arrangement direction of the quantum rods 33 to be adjusted between a first arrangement direction and a second arrangement direction. This achieves precise adjustment of the viewing angle, improves the diversity and adjustability of the viewing angle, expands the applicability range, improves the overall adjustment accuracy, and is easy to operate. The quantum rod film 3, combined with the display liquid crystal cell 2, replaces the conventional louvered optical film. During use, it can switch between wide-viewing-angle and narrow-viewing-angle modes without repeatedly pasting or tearing the louvered optical film, making it convenient to use. At the same time, it can also protect the display liquid crystal cell 2, avoiding unnecessary scratches or damage to the display liquid crystal cell 2 caused by repeated pasting or tearing of the louvered optical film, thus improving the overall working stability and safety of use. The optical transparent adhesive 4 and the transparent substrate 31 both have a certain thickness, which can improve the connection strength between the quantum rod film 3 and the liquid crystal display cell 2, and also improve the overall working stability and safety of the display device.

[0049] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A quantum rod thin film, characterized in that, The device includes two transparent substrates (31) arranged opposite each other, a polymer solution (32) filled between the two transparent substrates (31), and a plurality of quantum rods (33) disposed in the polymer solution (32). The quantum rods (33) have a first arrangement direction and a second arrangement direction. A transparent electrode (34) is provided on one of the transparent substrates (31), and at least a portion of the quantum rods (33) are driven by the transparent electrode (34) to switch between the first arrangement direction and the second arrangement direction.

2. The quantum rod thin film according to claim 1, characterized in that, The transparent electrode (34) is provided in multiple ways, and the multiple transparent electrodes (34) are evenly distributed, and there is a gap between adjacent transparent electrodes (34), with the distance between adjacent transparent electrodes (34) being 30-60um.

3. The quantum rod thin film according to claim 1, characterized in that, The quantum rod (33) includes a body made of semiconductor material and electric field sensing groups disposed on the surface of the body.

4. A display device, characterized in that, It includes a backlight (1), a display liquid crystal cell (2), and a quantum rod film (3) as described in any one of claims 1-3, wherein the quantum rod film (3) is disposed on one side of the display liquid crystal cell (2).

5. The display device according to claim 4, characterized in that, The quantum rod film (3) is disposed between the backlight (1) and the display liquid crystal cell (2). The display liquid crystal cell (2) includes a lower polarizer (21) connected to the quantum rod film (3). The first arrangement direction is parallel to the absorption axis direction of the lower polarizer (21).

6. The display device according to claim 5, characterized in that, The second arrangement direction is orthogonal to the absorption axis direction of the lower polarizer (21).

7. The display device according to claim 4, characterized in that, The quantum rod film (3) is disposed on the side of the display liquid crystal cell (2) away from the backlight (1). The display liquid crystal cell (2) includes an upper polarizer (22) connected to the quantum rod film (3). The first arrangement direction is parallel to the absorption axis direction of the upper polarizer (22).

8. The display device according to any one of claims 4-7, characterized in that, An optically transparent adhesive (4) is provided between the display liquid crystal cell (2) and the quantum rod film (3). The thickness of the optically transparent adhesive (4) is A, and the thickness of the transparent substrate (31) in contact with the optically transparent adhesive (4) is B, where A+B≥100um.

9. The display device according to claim 4, characterized in that, The quantum rod film (3) is disposed between the backlight (1) and the display liquid crystal cell (2). The display liquid crystal cell (2) includes an array substrate (23). The array substrate (23) and a transparent substrate (31) are the same substrate. A metal grid (24) is provided on the side of the array substrate (23) away from the quantum rod film (3). The first arrangement direction is parallel to the polarization direction of the metal grid (24).

10. The display device according to claim 4, characterized in that, The quantum rod thin film (3) is disposed on the side of the display liquid crystal cell (2) away from the backlight (1). The display liquid crystal cell (2) includes a color filter substrate (25). The color filter substrate (25) and a transparent substrate (31) are the same substrate. A metal grid (24) is provided on the side of the color filter substrate (25) away from the quantum rod thin film (3). The first arrangement direction is parallel to the polarization direction of the metal grid (24).

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