Display panel and display device

Abstract

The present invention discloses a display panel and a display device, wherein the display panel comprises an array substrate, a display device and an electro-polarizing layer; the display device is arranged on the array substrate; the electro-polarizing layer is located on the light-emitting side of the display device; the electro-polarizing layer comprises an electro-polarizing material, wherein when a voltage is applied, the crystal structure of the electro-polarizing material is arranged in a first direction, and when the applied voltage is changed, the arrangement direction of the crystal structure is deflected and arranged in a second direction, and the angle between the first direction and the second direction is greater than 0 degrees and less than or equal to 90 degrees, and the deflection angle changes with the change of the voltage to adjust the light transmittance of the electro-polarizing layer. In the above manner, the present invention can improve the contrast and brightness of the display panel, and can also reduce the power consumption of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic display technology, and in particular to a display panel and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode, active matrix organic light-emitting diode) display technology has the characteristics of self-luminescence, wide viewing angle, high contrast, fast response speed, low power consumption, ultra-light and thin, and is widely used in the industry. The OLED display panel itself is a self-luminous display mode, but when the external light source shines on the metal electrode of the OLED, the light will be reflected back, causing reflected light interference on the surface of the OLED display screen, reducing the contrast. To solve this technical problem, the current common method is to set a polarizer on the light-emitting side of the display panel. However, the polarizer structure inside the current OLED display screen is prone to aging, the service life of the display screen is not high, and the thickness of the polarizer is about 100μm, which has a great impact on the thickness of the OLED display screen. In addition, since the existing polarizer solution adopts a circular polarization polarization structure, while the polarization rate is improved, the transmittance is still less than 50%, which increases the power consumption of the OLED device. Therefore, a new display technology for OLED display screens that can solve the above problems is needed. Summary of the invention

[0003] The main technical problem solved by the present invention is to provide a display panel and a display device, which can improve the contrast and brightness of the display panel and reduce the power consumption of the display panel.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a display panel, which includes an array substrate; a display device, which is arranged on the array substrate; an electro-polarizing layer, which is located on the light-emitting side of the display device; the electro-polarizing layer contains an electro-polarizing material, and when a voltage is applied, the crystal structure of the electro-polarizing material is arranged in a first direction; when the applied voltage is changed, the arrangement direction of the crystal structure is deflected and arranged in a second direction, and the angle between the first direction and the second direction is greater than 0 degree and less than or equal to 90 degrees, and the deflection angle changes with the change of voltage to adjust the light transmittance of the electro-polarizing layer.

[0005] In one embodiment, the crystal structure in the electro-deflectable material is an elliptical three-dimensional structure. When a voltage is applied, the crystal structure in the electro-deflectable material is arranged in a first direction. When the applied voltage is changed, the crystal structure in the electro-deflectable material is arranged in a second direction.

[0006] In one embodiment, the electro-deflectable material comprises a silicon compound capable of undergoing a reversible electrochemical dehydrogenation and / or hydroxide ion exchange reaction under the action of a voltage.

[0007] In one embodiment, when no voltage is applied, the crystal structure in the electro-polarizing material is arranged in a first direction, and light is not allowed to pass through, making the electro-polarizing layer opaque;

[0008] When a voltage is applied, the crystal structure in the electro-polarizing material is aligned in a second direction, allowing light to pass through, making the electro-polarizing layer light-transmissive;

[0009] The first direction is perpendicular to the light emitting direction of the display panel;

[0010] In one embodiment, when a voltage is applied, the crystal structure in the electro-polarizing material is arranged in a second direction, which does not allow light to pass through, making the electro-polarizing layer opaque;

[0011] When no voltage is applied, the crystal structure in the electro-polarizing material is arranged in a first direction, which allows light to pass through, making the electro-polarizing layer light-transmissive;

[0012] The second direction is perpendicular to the light emitting direction of the display panel;

[0013] In one embodiment, the electro-polarizing layer is black when it is opaque to light.

[0014] In one embodiment, the light emitting device includes a first electrode, a light emitting layer, and a second electrode which are sequentially stacked on an array substrate, and the electro-polarizing layer is arranged on a side of the second electrode away from the light emitting layer;

[0015] In one embodiment, the electropolarizing layer is in contact with the second electrode.

[0016] In one embodiment, the electro-polarizing layer comprises an electro-polarizing material layer and a protective layer, wherein the protective layer is located on a side of the electro-polarizing material layer away from the second electrode.

[0017] In one embodiment, the protective layer is a single atomic layer.

[0018] In one embodiment, the single-atom protective layer is a graphene single-atom layer.

[0019] In one embodiment, the thickness of the electropolarizing layer is 30-70 μm.

[0020] In one embodiment, the display panel further includes an encapsulation layer, and the encapsulation layer is located on a side of the electropolarizing layer away from the second electrode.

[0021] In order to solve the above technical problem, another technical solution adopted by the present invention is: to provide a display device, which includes a driving circuit and a display panel of any one of the above embodiments.

[0022] The beneficial effects of the present invention are as follows: different from the prior art, the present invention sets an electropolarizing layer on the light-emitting side of the display device. By adopting the electropolarizing layer, the problem of metal electrode reflection can be solved without setting a polarizer structure on the display panel. After the display panel is lit, its light transmittance is adjustable, and compared with the original polarizer structure, it can have a larger light transmittance, thereby improving the contrast and brightness of the display panel, and reducing the power consumption of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an embodiment of a display panel of the present application;

[0024] Figure 2 is a schematic diagram of the crystal structure of the electro-deflectable material in an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the arrangement state of the electrodeflectable material in an embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram of another embodiment of the display panel of the present application;

[0027] Figure 5 is a structural schematic diagram of another embodiment of the display panel of the present application;

[0028] Figure 6 It is a structural schematic diagram of an implementation method of a protective layer of a display panel of the present application;

[0029] Figure 7 It is a schematic diagram of the top structure of an embodiment of the display panel of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0031] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of an embodiment of a display panel of the present application. In this embodiment, the display panel 100 includes a display device 20 and an electro-polarizing layer 30 located on the light-emitting side of the display device 20 .

[0032] The electro-polarizing layer 30 includes an electro-polarizing material. When a voltage is applied, the crystal structure of the electro-polarizing material is arranged in a first direction. When the applied voltage is changed, the crystal structure of the electro-polarizing material is arranged in a second direction. The angle between the first direction and the second direction is greater than 0 degree and less than or equal to 90 degrees. The deflection angle changes with the change of the voltage, that is, the arrangement direction of the crystal structure inside the electro-polarizing material can be changed under electrical control to adjust the light transmittance of the electro-polarizing layer.

[0033] See also Figure 2 , Figure 2 Schematic diagram of the crystal structure of the electro-deflectable material in the embodiment of the present application. In the embodiment, the crystal structure of the electro-deflectable material is an elliptical three-dimensional structure. When the working voltage is applied, the crystal structure in the electro-deflectable material is arranged in a first direction. When the working voltage is changed, the crystal structure in the electro-deflectable material is arranged in a second direction. The working voltage in the present application can be 0V or non-0V.

[0034] It is worth noting that the arrangement direction of the crystal structure in the electro-deflectable material in this embodiment is the direction where the long axis of the elliptical three-dimensional structure is located.

[0035] See also Figure 3 , Figure 3 Schematic diagram of the arrangement state of the electro-deflectable material in the embodiment of the present application. When no power is applied, that is, it is equivalent to applying a 0V voltage. At this time, the crystal structure in the electro-deflectable material is arranged in a first direction. In this state, the arrangement direction of the crystal structure in the electro-deflectable material is perpendicular to the light emitting direction of the display panel, and light is not allowed to pass through the electro-polarizing layer. In other words, it can be understood that the electro-polarizing layer at this time is in a dark state and cannot pass light. When the electro-deflectable material is energized, that is, the applied voltage changes, the arrangement direction of its crystal structure is deflected and arranged in a second direction. By adjusting different driving voltages / currents, the size of the deflection angle of the arrangement direction of the crystal structure in the electro-deflectable material can be adjusted, that is, the arrangement direction of the crystal structure in the electro-deflectable material is at a certain angle to the light emitting direction, for example, the deflection angle is 30 degrees, 45 degrees or 60 degrees.

[0036] Preferably, Figure 3 As shown, when a first voltage (non-0V voltage) is applied to the electro-polarizing material, the crystal structure in the electro-polarizing material is arranged in a second direction. In this state, the arrangement direction of the crystal structure in the electro-polarizing material is parallel to the light emitting direction of the display panel, that is, the deflection angle is 90 degrees, so that light can pass through the electro-polarizing layer. In other words, it can be understood that the electro-polarizing layer is in a transparent state at this time and can pass light.

[0037] Therefore, by controlling the driving voltage of the electro-deflectable material, the arrangement direction of the crystal structure in the electro-deflectable material can be changed, thereby obtaining different crystal structure arrangement states, and thus can be adjusted according to actual use conditions to obtain different transmittances.

[0038] For example, when the display device emits light, the arrangement direction of the crystal structure in the electro-polarizing material of the corresponding light-emitting area is adjusted to be parallel to the light-emitting direction of the display device to allow light to pass through, so that the electro-polarizing layer of the corresponding light-emitting area is transparent as a whole and has a higher light transmittance.

[0039] In this embodiment, by providing an electro-polarizing layer on the light-emitting side of the display device, it is possible to absorb and block external light from entering the display panel, while allowing the light corresponding to the light-emitting area to be emitted. By adopting the electro-polarizing layer, the metal electrode reflection problem can be solved without providing a polarizer structure on the display panel 100, and after the display panel is lit, it can have a greater light transmittance than the original polarizer structure, thereby improving the contrast and brightness of the display panel 100, and can also reduce the power consumption of the display panel.

[0040] In other embodiments, when voltage is applied (non-0V voltage), the crystal structure in the electro-polarizing material is arranged in the second direction, and light is not allowed to pass through, making the electro-polarizing layer opaque; when no voltage is applied (0V voltage), the crystal structure of the electro-polarizing material is arranged in the first direction, and light can be allowed to pass through, making the electro-polarizing layer translucent. The second direction in this embodiment is perpendicular to the light emitting direction of the display panel.

[0041] Please refer to Figure 1 and Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the structure of another embodiment of the display panel of the present application. In this embodiment, the display panel 100 includes an array substrate 10 , a display device 20 , an electro-polarizing layer 30 and an encapsulation layer 40 .

[0042] The array substrate 10 includes a substrate 101 and an array layer 102. The substrate 101 can be a flexible substrate or a rigid substrate. The array layer 102 is provided with pixel circuits and signal lines (not shown) for driving the display device 20 to emit light.

[0043] The display device 20 includes a first electrode 201, a light-emitting layer 202, and a second electrode 203 which are sequentially stacked on the array substrate 10. The first electrode 201 may be an anode, and the second electrode 203 may be a cathode. The display device 20 may be a bottom emission type display device or a top emission type display device. In this embodiment, the display device 20 is a top emission type display device.

[0044] The encapsulation layer 40 is used to encapsulate the display device 20 to isolate external water and air and extend the service life of the display device 20. The encapsulation layer 40 can be a thin film encapsulation layer, including a sandwich structure of a laminated inorganic thin film encapsulation layer, an organic thin film encapsulation layer, and an inorganic thin film encapsulation layer, which can block the invasion of water vapor and oxygen.

[0045] In this embodiment, the electropolarizing layer 30 can be disposed between the second electrode 203 and the encapsulation layer 40. That is, the electropolarizing layer 30 is disposed on the side of the second electrode 203 away from the light-emitting layer 202. The area of ​​the electropolarizing layer 30 is greater than or equal to the area of ​​the second electrode 203, so that the second electrode 203 can be completely covered and shielded, thereby effectively shielding the external light and reducing the light reflection of the metal electrode. Through this arrangement, the electropolarizing layer can be used to improve the reflection problem of the metal electrode, and the encapsulation layer can be used to protect the electropolarizing layer to prevent the electropolarizing layer from being corroded by the environment.

[0046] Please refer to Figure 1 and Figure 5 , Figure 5 3 is a schematic diagram of the structure of another embodiment of the display panel of the present application. In this embodiment, the electro-polarizing layer 30 includes an electro-polarizing material layer 301 and a protective layer 302. Specifically, the protective layer 302 is located on a side of the electro-polarizing material layer 301 away from the second electrode 203. The provision of the protective layer 302 can protect the polarizing material layer 301 from being corroded by the environment, and at the same time protect the arrangement direction of the crystal structure in the polarizing material from being destroyed.

[0047] See also Figure 6 , Figure 6 1 is a schematic diagram of a structure of an embodiment of a protective layer of a display panel of the present application. In this embodiment, the protective layer is a single atomic layer. The single atomic protective layer can be formed by magnetron sputtering, which can greatly reduce the film thickness while playing a protective role, so as to reduce the total thickness of the display panel. The single atomic protective layer can be a graphene single atomic layer.

[0048] In one embodiment, the electro-deflection material is prepared from ionic silicon, silicon carbide, tungsten trioxide, and titanium oxide raw materials, and a small amount of additives such as one or more of aluminum, lithium, or cadmium is added during the preparation process. Under the action of voltage, the electro-deflection material can undergo reversible electrochemical dehydrogenation and / or hydroxide ion exchange reactions inside its crystal structure, causing the electro-deflection material to gradually become transparent, thereby further changing the light transmittance of the electro-deflection material layer.

[0049] When a voltage (a voltage other than 0V) is applied to the electro-deflectable material, the temperature of the electro-deflectable material changes due to the certain resistance of the material itself. Under the action of the voltage, the internal structure of the electro-deflectable material changes due to the thermal effect temperature T. When the effective value of the temperature T is within the effective value range of the crystal transition temperature Tg, the dynamic covalent bonds break, the crystal structure changes from a solid crystal structure to a liquid crystal structure, and the silicon compound dehydrogenates and / or hydroxylates, resulting in a change in the internal structure of the crystal, which changes the overall color of the electro-deflectable material, thereby further changing the overall light transmittance of the electro-deflectable material layer. It is worth noting that when the crystal structure changes from a solid crystal structure to a liquid crystal structure, the overall outline of the crystal structure of the silicon compound does not change, and it is still an elliptical three-dimensional structure.

[0050] In one embodiment, the array layer 102 is provided with a pixel circuit for driving the display device 20 to emit light, and the pixel circuits are multiple, and the multiple pixel circuits are arranged in an array, and each pixel circuit is connected to a display device of the display panel, and is used to provide a driving voltage to drive the corresponding display device to emit light. The pixel circuit includes a transistor, for example, a thin film transistor (TFT) with a large current passing capacity and good device stability. According to different designs of the pixel circuit, the number of transistors included in each pixel circuit can be adjusted and changed according to its specific design. For example, it can include seven transistors and a storage capacitor.

[0051] In this embodiment, the array layer 102 is provided with a driving circuit for driving and adjusting the arrangement direction of the electro-polarizing material. The driving circuit can be electrically connected to one or more TFT switches, and electrically connected to the electro-polarizing layer through the TFT switch to realize whether to provide a working voltage signal to the electro-polarizing layer. In addition, the electro-polarizing layer is connected to the driving IC through a wire and is controlled by the driving IC, thereby controlling the arrangement direction and color change of the crystal structure in the electro-polarizing material to control the light transmittance of the electro-polarizing layer.

[0052] See 7, Figure 7 This is a schematic diagram of a top view of an embodiment of a display panel of the present application. In this embodiment, the display panel includes a display area (AA area) and a non-display area (non-AA area), and correspondingly, the electro-polarizing layer includes a first area corresponding to the display area and a second area corresponding to the non-display area; the driving voltage of the electro-polarizing material in the first area and the second area can be controlled respectively to control the arrangement direction of the crystal structure in the electro-polarizing material and the overall color of the electro-polarizing material, thereby controlling the light penetration of the light emitting layer.

[0053] Specifically, when the display device in the light-emitting area is controlled to emit light, the TFT of the pixel circuit is controlled to input a display driving voltage to the display device to drive the display. At the same time, the TFT corresponding to the electro-deflection material is controlled to provide a first electrical signal so that the arrangement direction of the crystal structure in the electro-deflection material is parallel to the direction of the light path, and the light path of the display device is upward. At the same time, the crystal structure changes inside, so that the electro-deflection layer is transparent as a whole, and the display panel is at maximum brightness after lighting; the brightness of the display panel can be adjusted by adjusting the TFT driving voltage.

[0054] When controlling the arrangement direction of the crystal structure in the electro-deflection material corresponding to the non-display area, the TFT of the corresponding electro-deflection material is controlled to provide a second electrical signal so that the arrangement direction of the crystal structure in the electro-deflection material is perpendicular to the direction of the light path. The second electrical signal can be a 0 voltage signal, so that the electro-polarization layer does not allow light to pass through and is black, thereby blocking the upward light path of the display device and absorbing external light to avoid optical reflection of external light in the display device.

[0055] In this embodiment, by providing an electropolarizing layer, the transmittance of the electropolarizing layer can be effectively controlled to replace the existing polarizer layer, thereby reducing the total thickness of the film layer, improving the transmittance, reducing device power consumption, extending service life, improving contrast, etc.

[0056] In one embodiment, the electro-deflection material layer may be formed by chemical coating, physical coating, etc. For example, the electro-deflection material layer may be formed by coating directly on the second electrode 203, or other film layers may be formed on the second electrode 203 first, and then the electro-deflection material layer may be formed on the other film layers. That is, other film layers may be arranged between the second electrode 203 and the electro-deflection material layer. Preferably, no film layer is arranged between the second electrode 203 and the electro-deflection material layer, that is, the electro-deflection material layer is in contact with the second electrode 203, and no protective film layer such as an insulating layer is arranged between the two. This structural design can save film layer structure and reduce the overall thickness of the display panel.

[0057] Furthermore, the electro-polarizing layer 30 may be formed by only forming an electro-deflecting material layer, that is, the electro-polarizing layer only includes the electro-deflecting material layer. Alternatively, after forming the electro-deflecting material layer, a protective layer may be formed on the electro-deflecting material layer, that is, the electro-polarizing layer includes the electro-deflecting material layer and the protective layer, and the protective layer may be formed by magnetron sputtering, such as sputtering and depositing a single atomic layer on the electro-deflecting material layer to serve as the protective layer.

[0058] The total thickness of the formed electropolarizing layer may be 30-70 μm, such as 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, etc. Compared with the existing polarizer structure, the film structure of the electropolarizing layer is thinner and has better bendability.

[0059] In the above implementation manner, the present application uses an electropolarizing layer to replace the existing polarizer structure, which can reduce the production cost of the display panel and simplify the process flow. The formed electropolarizing layer can improve the transmittance of the display panel and reduce the power consumption of the display panel.

[0060] The display panel provided in the present application may be an OLED display panel, or a light emitting diode (LED), an organic light emitting diode (OLED), a Micro-LED, etc. That is, the display panel disclosed in the present application may be used in a variety of display modes, such as OLED display, quantum dot display, Micro-LED display, etc.

[0061] Based on this, the present application also provides a display device, the display device includes a driving chip and a display panel, the driving chip provides a driving signal for the display panel. The display panel can be a display panel of any of the above embodiments.

[0062] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: An array substrate, comprising an array layer; A display device is disposed on the array substrate; An electro-polarizing layer, located on the light-emitting side of the display device; The electro-polarizing layer comprises an electro-polarizing material, wherein when a voltage is applied, a crystal structure of the electro-polarizing material is arranged in a first direction; when the applied voltage is changed, the arrangement direction of the crystal structure is deflected and arranged in a second direction, and an angle between the first direction and the second direction is greater than 0 degree and less than or equal to 90 degrees, and the deflection angle changes with the change of the voltage to adjust the light transmittance of the electro-polarizing layer; when no voltage is applied, the crystal structure in the electro-polarizing material is arranged in the first direction, and light is not allowed to pass through, so that the electro-polarizing layer is opaque; when a voltage is applied, the crystal structure in the electro-polarizing material is arranged in the second direction, and light is allowed to pass through, so that the electro-polarizing layer is translucent; the first direction is perpendicular to the light emitting direction of the display panel; The array layer is provided with a pixel circuit for driving the display device to emit light and a driving circuit for driving and adjusting the arrangement direction of the electro-polarizing material. The pixel circuit includes a thin film transistor. The driving circuit is electrically connected to the thin film transistor. The driving circuit is electrically connected to the electro-polarizing layer through the thin film transistor to realize whether to provide a working voltage signal to the electro-polarizing layer.

2. The display panel according to claim 1, characterized in that: The crystal structure in the electro-deflectable material is an elliptical three-dimensional structure. When a voltage is applied, the crystal structure in the electro-deflectable material is arranged in a first direction. When the applied voltage is changed, the crystal structure in the electro-deflectable material is arranged in a second direction.

3. The display panel according to claim 2, characterized in that: The electro-deflectable material can undergo reversible electrochemical dehydrogenation and / or hydroxyl ion exchange reactions inside its crystal structure under the action of voltage.

4. The display panel according to claim 1, characterized in that: The electro-polarizing layer is black when it is opaque.

5. The display panel according to claim 1, characterized in that: The display device comprises a first electrode, a light-emitting layer and a second electrode which are sequentially stacked on the array substrate, and the electro-polarizing layer is arranged on a side of the second electrode away from the light-emitting layer.

6. The display panel according to claim 5, characterized in that: The electropolarizing layer is in contact with the second electrode.

7. The display panel according to claim 5, characterized in that: The electro-polarizing layer includes an electro-polarizing material layer and a protective layer, wherein the protective layer is located at a side of the electro-polarizing material layer away from the second electrode.

8. The display panel according to claim 7, characterized in that: The protective layer is a single atomic layer.

9. The display panel according to claim 8, characterized in that: The single atomic layer is a graphene single atomic layer.

10. The display panel according to claim 1, characterized in that: The thickness of the electropolarizing layer is 30-70 μm.

11. A display device, characterized in that: The device comprises a driving circuit and a display panel as claimed in any one of claims 1 to 10.

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