Liquid crystal display device

Abstract

The embodiment of the utility model provides a liquid crystal display device, relates to the technical field of display, and aims to solve the problem that a light sensor is arranged in a non-display area of the display device and is not beneficial to narrow frame design of the liquid crystal display device in the prior art. The liquid crystal display device comprises a display panel, a first polaroid, a depolarizing film, a second polaroid and a light sensor, wherein the first polaroid is arranged on the light emitting side of the display panel, and the depolarizing film, the second polaroid and the light sensor are sequentially arranged in the direction, away from the first polaroid, of the display panel. Wherein the light sensor is located in a display area of the liquid crystal display device, the depolarization film is configured to convert linearly polarized light passing through the depolarization film into polarized light with multiple polarization directions, and the depolarization film covers the light sensor.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a liquid crystal display device. Background Art

[0002] Liquid crystal display devices generally include a display panel and a light sensor, and the light sensor is used to receive ambient light so that the display panel can meet the viewing needs of users according to different external environments. In the related art, the light sensor is generally arranged in the non-display area of ​​the liquid crystal display device, which results in a large area of ​​the non-display area, which is not conducive to the narrow frame design and full-screen display of the liquid crystal display device. Utility Model Content

[0003] The embodiments of the present application provide a liquid crystal display device to solve the problem in the related art that a light sensor is disposed in a non-display area of ​​the display device, which is not conducive to a narrow frame design of the liquid crystal display device.

[0004] On the one hand, an embodiment of the present application provides a liquid crystal display device, which includes: a display panel, a first polarizer disposed on the light-emitting side of the display panel, and a depolarizing film, a second polarizer, and a light sensor disposed in sequence along the direction of the display panel away from the first polarizer. The light sensor is located in the display area of ​​the liquid crystal display device, the depolarizing film is configured to convert linearly polarized light passing through the depolarizing film into polarized light with multiple polarization directions, and the depolarizing film covers the light sensor.

[0005] In some embodiments, along the direction of the display surface of the liquid crystal display device, the area of ​​the depolarization film is larger than the area of ​​the light sensor.

[0006] In some embodiments, the orthographic projection of the optical sensor on the depolarizing film is located within the range of the depolarizing film.

[0007] In some embodiments, the second polarizer has an opening at a position corresponding to the light sensor.

[0008] In some embodiments, the depolarization film includes a first substrate layer and a first liquid crystal layer located on the first substrate layer, and the first liquid crystal layer is configured to convert linearly polarized light passing through the first liquid crystal layer into polarized light having multiple polarization directions.

[0009] In some embodiments, the liquid crystal display device further includes a second substrate layer located between the display panel and the first polarizer, and the second substrate layer is disposed around the first substrate layer.

[0010] In some embodiments, the thickness of the second substrate layer is the same as the thickness of the first substrate layer.

[0011] In some embodiments, the first liquid crystal layer has n orientation zones, the long axis angles of the liquid crystal molecules in the same orientation zone are the same, and the long axis angles of the liquid crystal molecules in different orientation zones are different, and the long axis angles of the liquid crystal molecules in any two orientation zones differ by πm / n, wherein m and n are both integers, n≥2, and n-1≥m≥0.

[0012] In some embodiments, the display panel includes: an array substrate, a color filter substrate, and a second liquid crystal layer located between the array substrate and the color filter substrate, and the depolarization film is located on a side of the array substrate away from the second liquid crystal layer.

[0013] In some embodiments, the light sensor includes at least one of an ambient light sensor and a color sensor.

[0014] For the liquid crystal display device provided by the embodiment of the present application, the ambient light enters the interior of the display panel from the light-emitting side of the display panel, and most of the ambient light is converted into linear polarized light after passing through the first polarizer, and the polarization degree of the light after passing through the first polarizer is close to 100%; after the linear polarized light passes through the depolarizing film, the depolarizing film converts the linear polarized light into mixed light with multiple polarization components, and reduces the polarization degree of the light to about 5%; and in the process of passing through the second polarizer, part of these lights are reflected or absorbed by the second polarizer, and the other part passes through the second polarizer and is received by the light sensor. Therefore, for the above-mentioned liquid crystal display device, since the light sensor is arranged in the display area, it can avoid the occupation of the non-display area by the light sensor, thereby reducing the frame size of the liquid crystal display device, and further facilitating the narrow frame design and full-screen display of the liquid crystal display device. In addition, by setting the depolarizing film, it can reduce the polarization degree of the light after passing through the depolarizing film to a large extent, which is conducive to ensuring the light receiving amount of the light sensor, and further ensuring the accuracy of the detection result of the ambient light by the light sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional structural diagram of a liquid crystal display device provided in some embodiments of the present application;

[0016] Figure 2 is a cross-sectional structural diagram of a liquid crystal display device provided in some other embodiments of the present application;

[0017] Figure 3 is a cross-sectional structural diagram of a liquid crystal display device provided in some other embodiments of the present application;

[0018] Figure 4 is a cross-sectional structural diagram of a liquid crystal display device provided in some other embodiments of the present application;

[0019] Figure 5 It is a three-dimensional structural diagram of a depolarization film according to some embodiments of the present application. DETAILED DESCRIPTION

[0020] 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 described technical solutions 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.

[0021] In the description of this application, it should be understood that 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.

[0022] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0023] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0024] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present application.

[0025] The various embodiments of the present application are similar, and features in different embodiments and / or different examples may be combined with each other.

[0026] A liquid crystal display device generally includes a display panel and a light sensor, wherein the light sensor is used to receive ambient light so that the display panel can meet the viewing needs of users according to different external environments.

[0027] In the related art, the optical sensor is usually arranged in the non-display area of ​​the liquid crystal display device, which results in a larger area of ​​the non-display area, which is not conducive to the narrow frame design and full-screen display of the liquid crystal display device.

[0028] Based on this, some embodiments of the present application provide a liquid crystal display device, such as Figures 1 to 4As shown, the liquid crystal display device 100 has a display area AA and a non-display area NA, and the non-display area NA is located on at least one side of the display area AA. The liquid crystal display device 100 includes: a display panel 10, a first polarizer 20, a depolarizing film 30, a second polarizer 40, and a light sensor 50. Among them, the first polarizer 20 is arranged on the light-emitting side of the display panel 10, the depolarizing film 30, the second polarizer 40, and the light sensor 50 are located on the side of the display panel 10 away from the first polarizer 20 and are arranged in sequence along the direction of the display panel 10 away from the first polarizer 20. The depolarizing film 30 is arranged between the display panel 10 and the second polarizer 40, and the light sensor 50 is located on the side of the second polarizer 40 away from the depolarizing film 30.

[0029] The light sensor 50 is located in the display area AA, the depolarizing film 30 is configured to convert the linearly polarized light passing through the depolarizing film 30 into mixed light of multiple polarization components, and the depolarizing film 30 covers the light sensor 50 .

[0030] Through the above arrangement, the ambient light enters the inside of the display panel 10 from the light-emitting side of the display panel 10, and most of the ambient light is converted into linear polarized light after passing through the first polarizer 20, and the polarization degree of the light after passing through the first polarizer 20 is close to 100%; after the linear polarized light passes through the depolarizing film 30, the depolarizing film 30 converts the linear polarized light into mixed light with multiple polarization components, and reduces the polarization degree of the light to about 5%; and in the process of these lights passing through the second polarizer 40, part of them is reflected or absorbed by the second polarizer 40, and the other part passes through the second polarizer 40 and is received by the light sensor 50. Therefore, for the above-mentioned liquid crystal display device 100, since the light sensor 50 is arranged in the display area AA, it can avoid the occupation of the non-display area NA by the light sensor 50, thereby reducing the frame size of the liquid crystal display device 100, which is beneficial to the narrow frame design and full-screen display of the liquid crystal display device 100. In addition, by providing the depolarizing film 30, the polarization degree of the light passing through the depolarizing film 30 can be reduced to a large extent, which is beneficial to ensure the light receiving amount of the light sensor 50, and further ensure the accuracy of the detection result of the light sensor 50 for the ambient light.

[0031] In some embodiments, Figure 1 As shown, the depolarizing film 30 can partially cover the light sensor 50, and the orthographic projection of the depolarizing film 30 on the second polarizer 40 partially overlaps with the orthographic projection of the light sensor 50 on the second polarizer 40. In this way, the portion of the light sensor 50 covered by the depolarizing film 30 can well receive the ambient light, thereby achieving effective measurement of the intensity of the ambient light.

[0032] In other embodiments, Figures 2 to 4As shown, the depolarizing film 30 can completely cover the light sensor 50, that is, the orthographic projection of the light sensor 50 on the second polarizer 40 is located within the range of the orthographic projection of the depolarizing film 30 on the second polarizer 40. In this case, the orthographic projection of the light sensor 50 on the depolarizing film 30 is located within the range of the depolarizing film 30. In this way, it can be ensured that the light sensor 50 as a whole can well receive the ambient light, thereby realizing accurate and effective measurement of the intensity of the ambient light.

[0033] In some examples, along the direction of the display surface of the liquid crystal display device 100 (the direction of the display surface is perpendicular to the thickness direction of the liquid crystal display device 100), the shape and size of the depolarizing film 30 are respectively the same as the shape and size of the light sensor 50. In this case, the orthographic projection of the edge of the light sensor 50 on the second polarizer 40 overlaps with the orthographic projection of the edge of the depolarizing film 30 on the second polarizer 40. In this way, it can be ensured that the depolarizing film 30 completely covers the light sensor 50.

[0034] In other examples, such as Figures 2 to 4 As shown, along the direction of the display surface of the liquid crystal display device 100 (the direction of the display surface is perpendicular to the thickness direction of the liquid crystal display device 100), the area of ​​the depolarizing film 30 is larger than the area of ​​the light sensor 50. In this case, the orthographic projection of the edge of the light sensor 50 on the second polarizer 40 is located within the range of the orthographic projection of the depolarizing film 30 on the second polarizer 40. In this way, a part of the area of ​​the depolarizing film 30 exceeds the range of the light sensor 50, and a part of the ambient light will be obliquely incident on the light sensor 50 when passing through the part of the area of ​​the depolarizing film 30, so that the part of the ambient light has a smaller polarization degree, so that the light sensor 50 can effectively receive the part of the light, thereby increasing the light receiving amount of the light sensor 50.

[0035] In some examples, there is a spacing between the orthographic projection of the edge of the light sensor 50 on the second polarizer 40 and the orthographic projection of the edge of the depolarizing film 30 on the second polarizer 40. For example, the orthographic projection of the edge of the light sensor 50 on the second polarizer 40 and the orthographic projection of the edge of the depolarizing film 30 on the second polarizer 40 are arranged at an equal spacing. In this case, along the direction of the display surface of the liquid crystal display device 100, the shape of the depolarizing film 30 is the same as the shape of the light sensor 50, and the area of ​​the depolarizing film 30 is larger than the area of ​​the light sensor 50. In this way, the amount of light received by the light sensor 50 can be further increased.

[0036] In some embodiments, Figure 3 As shown, the second polarizer 40 is provided with an opening K at a position corresponding to the light sensor 50 .

[0037] It is worth noting that the opening K is disposed at the position of the second polarizer 40 corresponding to the light sensor 50 , which means that along the thickness direction of the liquid crystal display device 100 , the range of the opening K at least partially overlaps with the range of the light sensor 50 .

[0038] Through the above arrangement, the loss of light after passing through the depolarization film 30 can be reduced, so that this part of the light can be received by the light sensor 50 to a greater extent, thereby increasing the amount of light received by the light sensor 50.

[0039] Exemplarily, the opening K may be disposed throughout the second polarizer 40 in the thickness direction.

[0040] In some examples, the edge of the opening K is within the range of the positive projection of the light sensor 50 on the second polarizer 40. That is, the area of ​​the opening K is smaller than the area of ​​the light sensor 50.

[0041] In other examples, such as Figure 3 As shown, the orthographic projection of the edge of the light sensor 50 on the second polarizer 40 can overlap with the edge of the opening K. This can ensure that all light incident vertically toward the light sensor 50 can be effectively received, thereby ensuring that the light sensor 50 has a good light receiving amount; on the other hand, it can also ensure that the second polarizer 40 has a good structural strength.

[0042] In some other examples, the orthographic projection of the edge of the light sensor 50 on the second polarizer 40 may be within the range of the opening K. This may further increase the amount of light received by the light sensor 50. Exemplarily, when the area of ​​the depolarizing film 30 is larger than the area of ​​the light sensor 50, the edge of the opening K may overlap with the orthographic projection of the edge of the depolarizing film 30 on the second polarizer 40.

[0043] In some embodiments, the liquid crystal display device 100 further includes a backlight module, which is disposed on a side of the light sensor 50 away from the display panel 10 . The backlight module can provide a backlight source for the display panel 10 , thereby ensuring image display on the display panel 10 .

[0044] In some examples, the optical axis direction of the first polarizer 20 intersects with the optical axis direction of the second polarizer 40, for example, the angle between the optical axis direction of the first polarizer 20 and the optical axis direction of the second polarizer 40 is 90°. In this way, the light emitted from the backlight module becomes linearly polarized light after passing through the second polarizer 40, and this part of the linearly polarized light is converted into linearly polarized light rotated by 90° after passing through the liquid crystal layer (i.e., the second liquid crystal layer described later) in the display panel 10, so that this part of the linearly polarized light rotated by 90° can be smoothly emitted from the first polarizer 20.

[0045] In some embodiments, Figures 2 to 4As shown, the display panel 10 includes: an array substrate 11 and a color filter substrate 13 arranged opposite to each other and a second liquid crystal layer 12 located between the array substrate 11 and the color filter substrate 13 , and a depolarization film 30 is located on a side of the array substrate 11 away from the second liquid crystal layer 12 .

[0046] In some examples, the array substrate 11 includes a first substrate and a driving circuit layer disposed on the first substrate.

[0047] In some examples, the color filter substrate 13 includes: a second substrate and a color filter layer and a black matrix disposed on the second substrate, the color filter layer and the black matrix are disposed in the same layer, and each photoresist in the color filter layer is located in the light-transmitting gap of the black matrix.

[0048] In some embodiments, Figure 5 As shown, the depolarization film 30 includes a first substrate layer 31 and a first liquid crystal layer 33 located on the first substrate layer 31 . The first liquid crystal layer 33 is configured to convert linearly polarized light passing through the first liquid crystal layer 33 into mixed light of multiple polarization components.

[0049] In some examples, the first liquid crystal layer 33 may be located on a side of the first substrate layer 31 close to the display panel 10 .

[0050] In some examples, the material of the first substrate layer 31 includes one or more of polyethylene terephthalate (PET), polycarbonate (PC), and polymethyl methacrylate (PMMA).

[0051] In some examples, the depolarization film 30 further includes a liquid crystal alignment layer 32 located between the first substrate layer 31 and the first liquid crystal layer 33 .

[0052] In some examples, the material of the liquid crystal alignment layer 32 includes polyimide (PI), which can provide uniform liquid crystal alignment capability, thereby ensuring the arrangement stability of liquid crystal molecules in the first liquid crystal layer 33 .

[0053] In some embodiments, Figure 2 and Figure 5 As shown, the material of the first liquid crystal layer 33 is the same as that of the second liquid crystal layer 12, so that the material of the second liquid crystal layer 12 can be reused to make the first liquid crystal layer 33, which is beneficial to the production of the depolarization film 30 on the one hand; on the other hand, it is also beneficial to reduce the production cost of the liquid crystal display device 100.

[0054] In some examples, the material of the first liquid crystal layer 33 and the material of the second liquid crystal layer 12 are both self-aligned liquid crystal materials. By providing self-aligned liquid crystal materials, the use of liquid crystal alignment layers can be saved, thereby reducing the process steps and process time of the liquid crystal display device 100, while reducing material costs.

[0055] In some embodiments, Figure 4 As shown, the liquid crystal display device 100 further includes a second substrate layer 60 located between the display panel 10 and the second polarizer 40, and the second substrate layer 60 is disposed around the first substrate layer 31. In this case, the second substrate layer 60 and the first substrate layer 31 are disposed in the same layer.

[0056] The second substrate layer 60 can be provided to reduce the step difference around the depolarizing film 30 , thereby effectively avoiding the problem of poor structural stability of the liquid crystal display device 100 around the depolarizing film 30 due to the large step difference around the depolarizing film 30 .

[0057] In some embodiments, the thickness of the second substrate layer 60 is the same as that of the depolarizing film 30 , so as to avoid the problem of poor structural stability of the liquid crystal display device 100 at the position around the depolarizing film 30 .

[0058] In other embodiments, Figure 4 As shown, the thickness of the second substrate layer 60 is the same as the thickness of the first substrate layer 31. In this case, the second substrate layer 60 and the first substrate layer 31 can be manufactured simultaneously, which is beneficial to improving the manufacturing efficiency of the liquid crystal display device 100.

[0059] After the second substrate layer 60 and the first substrate layer 31 are simultaneously manufactured, a first liquid crystal layer 33 can be formed on the first substrate layer 31. The thickness of the first liquid crystal layer 33 is usually less than 20 μm. The step difference caused by the first liquid crystal layer 33 can be ignored, which is beneficial to ensure the structural stability of the liquid crystal display device 100 at the position around the corresponding depolarization film 30.

[0060] In some embodiments, Figure 5 As shown, the first liquid crystal layer 33 has n orientation zones 330, the long axis angles of all liquid crystal molecules in the same orientation zone 330 are the same, and the long axis angles of the liquid crystal molecules in different orientation zones 330 are different, and the long axis angles of the liquid crystal molecules in any two orientation zones 330 differ by mπ / n, wherein m and n are both positive integers, and n-1≥m≥1.

[0061] This arrangement allows the light to be converted into polarized light of various directions after passing through the first liquid crystal layer 33 , thereby reducing the polarization degree of this part of the light, so as to facilitate the light sensor 50 to receive this part of the light.

[0062] Illustratively, each orientation zone 330 is equal in size.

[0063] Exemplarily, the number of liquid crystal molecules in each alignment zone 330 is the same.

[0064] In some examples, the first liquid crystal layer 33 has four alignment zones 330, and the four alignment zones 330 are respectively a first alignment zone 331, a second alignment zone 332, a third alignment zone 333, and a fourth alignment zone 334. For example, the long axis angle of the liquid crystal molecules in the first alignment zone 331 is 0, the long axis angle of the liquid crystal molecules in the second alignment zone 332 is π / 4, the long axis angle of the liquid crystal molecules in the third alignment zone 333 is 2π / 4, and the long axis angle of the liquid crystal molecules in the fourth alignment zone 334 is 3π / 4. Of course, the long axis angles of the liquid crystal molecules in the first alignment zone 331, the second alignment zone 332, the third alignment zone 333, and the fourth alignment zone 334 can also be set in other ways.

[0065] In other examples, the first liquid crystal layer 33 may have 18 alignment zones 330 , and the major axis angles of the liquid crystal molecules in the 18 alignment zones 330 are 0, π / 18, 2π / 18, 3π / 18, 4π / 18, . . . 16π / 18 and 17π / 18, respectively.

[0066] In some embodiments, the light sensor 50 includes at least one of an ambient light sensor (ALS) and a color sensor (CS).

[0067] In the case where the light sensor 50 includes an ambient light sensor, the ambient light sensor can detect the intensity of external ambient light and be used to adjust the brightness and color temperature of the liquid crystal display device 100 to provide a better user experience.

[0068] When the light sensor 50 includes a color sensor, the color sensor can be used not only to manage the brightness of the liquid crystal display device 100, but also to manage the color temperature, so as to achieve accurate color reproduction and adapt the liquid crystal display device 100 to different viewing environments, such as fluorescent lighting, LED lighting, and natural sunlight.

[0069] In some examples, the number of ambient light sensors or color sensors in the light sensor 50 may be multiple, and a corresponding depolarization film 30 is provided at a position corresponding to each ambient light sensor or color sensor to cover the ambient light sensor or color sensor.

[0070] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A liquid crystal display device, characterized in that: include: Display panel; A first polarizer, disposed on the light-emitting side of the display panel; as well as A depolarizing film, a second polarizer, and a light sensor are sequentially arranged along a direction of the display panel away from the first polarizer; The light sensor is located in the display area of ​​the liquid crystal display device, the depolarizing film is configured to convert linearly polarized light passing through the depolarizing film into polarized light with multiple polarization directions, and the depolarizing film covers the light sensor.

2. The liquid crystal display device according to claim 1, wherein: Along the direction of the display surface of the liquid crystal display device, the area of ​​the depolarization film is larger than the area of ​​the light sensor.

3. The liquid crystal display device according to claim 2, characterized in that: The orthographic projection of the optical sensor on the depolarizing film is located within the range of the depolarizing film.

4. The liquid crystal display device according to claim 1, wherein: The second polarizer is provided with an opening at a position corresponding to the light sensor.

5. The liquid crystal display device according to any one of claims 1 to 4, characterized in that: The depolarization film includes a first substrate layer and a first liquid crystal layer located on the first substrate layer, wherein the first liquid crystal layer is configured to convert linearly polarized light passing through the first liquid crystal layer into polarized light having a plurality of polarization directions.

6. The liquid crystal display device according to claim 5, characterized in that: It also includes a second substrate layer located between the display panel and the first polarizer, and the second substrate layer is arranged around the first substrate layer.

7. The liquid crystal display device according to claim 6, characterized in that: The thickness of the second substrate layer is the same as that of the first substrate layer.

8. The liquid crystal display device according to claim 5, characterized in that: The first liquid crystal layer has n orientation zones, the long axis angles of the liquid crystal molecules in the same orientation zone are the same, and the long axis angles of the liquid crystal molecules in different orientation zones are different, and the long axis angles of the liquid crystal molecules in any two orientation zones differ by πm / n, wherein m and n are both integers, n≥2, and n-1≥m≥0.

9. The liquid crystal display device according to claim 5, characterized in that: The display panel comprises: an array substrate, a color filter substrate and a second liquid crystal layer located between the array substrate and the color filter substrate, and the depolarization film is located on a side of the array substrate away from the second liquid crystal layer.

10. The liquid crystal display device according to any one of claims 1 to 4, characterized in that: The light sensor includes at least one of an ambient light sensor and a color sensor.

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