Liquid crystal display panel with brightening effect

Abstract

This utility model discloses a liquid crystal display screen with a brightness enhancement effect, relating to the field of liquid crystal display screens. It includes a backlight structure, on which a lower polarizer, a liquid crystal screen, an upper polarizer, and a cover plate are stacked sequentially. The cover plate is bonded and fixed to the upper polarizer with optical adhesive. A brightness enhancement film is provided on the lower polarizer. This utility model, by setting a brightness enhancement film on the lower polarizer, allows light to be utilized more effectively after passing through the lower polarizer. The brightness enhancement film can change the propagation path and angle of light, causing more light to converge towards the front, thereby improving the overall brightness of the display screen. It is simple, easy to implement, and low in cost. It widens the user's viewing range and enhances the viewing angle. The brightness enhancement film is very thin and lightweight, conforming to the development trend of thinner and lighter electronic products. It also improves the uniformity of the liquid crystal display screen, reduces the power consumption of electronic products, extends battery life, and is energy-saving and environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, and in particular to a liquid crystal display with a brightness enhancement effect. Background Technology

[0002] With the increasing prevalence of smart technology, it is becoming ubiquitous in people's lives. Smart wearable products have been incredibly popular in recent years, with smartwatches and bracelets coming in various styles, serving not only as fitness devices but also as accessories. TFT displays (liquid crystal displays) are widely used in many electronic devices. However, in certain usage scenarios, higher brightness is required to ensure display quality, but traditional methods of increasing brightness often come with increased power consumption, which not only affects the device's battery life but may also lead to overheating issues.

[0003] Patent application CN201720472537.7 discloses a liquid crystal display screen that can enhance brightness under sunlight, comprising a control chip, a circuit board, a reflective sheet, a light guide plate, a diffuser, an optical brightness enhancement film, and a display panel arranged sequentially. The reflective sheet is equipped with a brightness enhancement component. Although this liquid crystal display screen uses the absorbed sunlight to enhance screen brightness by incorporating the brightness enhancement component on the reflective sheet, both the optical brightness enhancement film and the brightness enhancement component are located below the light guide plate. This only allows for the processing and recovery of light rays directed downwards from the light guide plate, failing to focus the upward-emitting light, resulting in poor brightness enhancement. Therefore, this utility model discloses a liquid crystal display screen with enhanced brightness to solve the above problems. Utility Model Content

[0004] Therefore, it is necessary to provide a liquid crystal display screen with a brightness enhancement effect to address the above-mentioned technical problems. By setting a brightness enhancement film on the lower polarizer, the light can be more effectively utilized after passing through the lower polarizer under the action of the brightness enhancement film, thereby improving the overall brightness of the display screen. At the same time, it does not increase the power consumption of the TFT screen. It is simple, easy to implement, and has a low cost. It also enhances the viewing angle, reduces the weight and thickness of the module, improves uniformity, and is energy-saving and environmentally friendly.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A liquid crystal display screen with a brightness enhancement effect includes a backlight structure, on which a lower polarizer, a liquid crystal screen, an upper polarizer and a cover plate are stacked in sequence. The cover plate is bonded and fixed to the upper polarizer with optical adhesive, and a brightness enhancement film is provided on the lower polarizer.

[0007] In a preferred embodiment of the liquid crystal display screen with brightness enhancement provided by this utility model, the brightness enhancement film is disposed on a surface of the lower polarizer near the backlight structure.

[0008] In a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the brightening film and the lower polarizer are stacked together to form an integral structure.

[0009] As a preferred embodiment of the liquid crystal display screen with brightness enhancement provided by this utility model, the lower polarizer includes a protective film, a brightness enhancement film, a lower pressure-sensitive adhesive layer, a lower TAC film, a PVA layer, an upper TAC film, an upper pressure-sensitive adhesive layer, and a release film stacked in sequence. When laminated, the brightness enhancement film is laminated to the backlight structure.

[0010] In a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the protective film is a PET antistatic film.

[0011] In a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the brightening film is an APF brightening film, and the thickness of the brightening film is 10-30μm.

[0012] As a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the backlight structure is provided with a light guide plate, and the surface of the light guide plate is provided with a micro prism array. The distribution density of the micro prisms in the micro prism array gradually increases along the direction away from the light source, and the height of the micro prisms also gradually increases.

[0013] In a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the microprism array is disposed on the bottom surface of the light guide plate and has a coverage of 60%-90%.

[0014] In a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the distribution density of microprisms in the microprism array near the light source is 25%-40% lower than the distribution density at the far end.

[0015] As a preferred embodiment of the liquid crystal display screen with brightening effect provided by this utility model, the microprisms in the microprism array are square pyramids with a height of 10-50μm and a density gradient variation range of 20%-50%.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model provides a liquid crystal display screen with a brightness enhancement effect. By setting a brightness enhancement film on the lower polarizer, light can be more effectively utilized after passing through the lower polarizer under the action of the brightness enhancement film. The brightness enhancement film can change the propagation path and angle of light, causing more light to gather in front, thereby improving the overall brightness of the display screen. It is simple to implement and has a low cost. It widens the user's viewing range and enhances the viewing angle. The brightness enhancement film is very thin and lightweight, which is in line with the development trend of thinner and lighter electronic products. It improves the uniformity of the liquid crystal display screen, reduces the power consumption of electronic products, extends battery life, and is energy-saving and environmentally friendly. Attached Figure Description

[0018] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the overall structure of the liquid crystal display screen with brightness enhancement effect provided by this utility model;

[0020] Figure 2 A schematic diagram of the lower polarizer structure in a liquid crystal display screen with a brightness enhancement effect provided by this utility model;

[0021] Figure 3 A comparative schematic diagram showing the addition of a brightness enhancement film to the LCD screen with brightness enhancement effect provided by this utility model;

[0022] Figure 4 A schematic diagram of the backlight structure in a liquid crystal display screen with a brightness enhancement effect provided by this utility model;

[0023] Figure 5 A schematic diagram of the light guide plate structure in the liquid crystal display screen with brightness enhancement provided by this utility model.

[0024] The markings in the diagram are explained as follows:

[0025] 1. Backlight structure; 2. Lower polarizer; 21. Protective film; 22. Brightness enhancement film; 23. Lower pressure-sensitive adhesive layer; 24. Lower TAC film; 25. PVA layer; 26. Upper TAC film; 27. Upper pressure-sensitive adhesive layer; 28. Release film; 3. LCD screen; 4. Upper polarizer; 5. Cover plate; 6. Optical adhesive; 7. Light guide plate; 8. Reflective film; 9. Microprism array. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] As described in the background section, TFT displays (liquid crystal displays) are widely used in many electronic devices. However, in certain application scenarios, higher brightness is required to ensure display quality, but traditional methods of increasing brightness often involve increased power consumption, which not only affects the device's battery life but may also cause heat generation issues. In existing LCD screen structures, the optical brightness enhancement film and components are both located below the light guide plate, which can only process and recycle light directed downwards from the light guide plate, but cannot focus the light emitted upwards from the light guide plate, resulting in poor brightness enhancement.

[0028] To solve this technical problem, this utility model provides a liquid crystal display screen with a brightness enhancement effect, which is applied in the field of liquid crystal display screens.

[0029] For details, please refer to Figure 1-2 The LCD screen with brightness enhancement effect specifically includes a backlight structure 1. A lower polarizer 2, an LCD screen 3, an upper polarizer 4, and a cover plate 5 are stacked sequentially on the backlight structure 1. The cover plate 5 is bonded and fixed to the upper polarizer 4 by optical adhesive 6. A brightness enhancement film 22 is provided on the lower polarizer 2.

[0030] The LCD screen with brightness enhancement provided by this utility model has a brightness enhancement film 22 set on the lower polarizer 2. After passing through the lower polarizer 2, the light can be more effectively utilized under the action of the brightness enhancement film 22. The brightness enhancement film 22 can change the propagation path and angle of the light, so that more light is gathered in front, thereby improving the overall brightness of the screen. It is simple, easy to implement and low in cost. It widens the user's viewing range and enhances the viewing angle. The brightness enhancement film 22 is very thin and lightweight, which is in line with the development trend of thinner and lighter electronic products. It improves the uniformity of the LCD screen, reduces the power consumption of electronic products, extends the battery life, and is energy-saving and environmentally friendly.

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] Example 1

[0035] Please refer to Figure 1-2 A liquid crystal display screen with a brightness enhancement effect is provided, which includes a backlight structure 1. A lower polarizer 2, a liquid crystal screen 3, an upper polarizer 4, and a cover plate 5 are stacked sequentially on the upper surface of the backlight structure 1. The liquid crystal screen 3 is composed of a TFT substrate, a liquid crystal layer, and a CF substrate. This part is a conventional structure and will not be described in detail here. The cover plate 5 is bonded and fixed to the upper polarizer 4 by optical adhesive 6, which is OCA adhesive. A brightness enhancement film 22 is provided on the lower polarizer 2. The brightness enhancement film 22 is disposed on the surface of the lower polarizer 2 near the backlight structure 1, and the brightness enhancement film 22 and the lower polarizer 2 are stacked into an integral structure. In this way, the assembly of the brightness enhancement film 22 can be completed by directly bonding and assembling the lower polarizer 2, which saves assembly time, improves assembly efficiency, and reduces production costs.

[0036] like Figure 2 As shown, specifically, the lower polarizer 2 includes, from bottom to top, a protective film 21, a brightness enhancement film 22, a lower pressure-sensitive adhesive layer 23, a lower TAC film 24, a PVA layer 25, an upper TAC film 26, an upper pressure-sensitive adhesive layer 27, and a release film 28, stacked sequentially. The protective film 21 is a PET antistatic film, and both the upper and lower pressure-sensitive adhesive layers 27 and 28 are PSA adhesive. The protective film 21 has a slight tack on one side and can bond to the brightness enhancement film 22. The brightness enhancement film 22 is bonded and fixed to the lower TAC film 24 by pressure-sensitive adhesive. The protective film 21 and the release film 28 are peeled off during the assembly of the lower polarizer 2. The protective film 21 and the release film 28 mainly serve a protective function. During assembly, the brightness enhancement film 22 is bonded to the backlight structure 1. The brightness enhancement film 22 is an APF brightness enhancement film 22, and the thickness of the brightness enhancement film 22 is 10-30 μm.

[0037] like Figure 3As shown, P-polarized light refers to P-polarized light, whose electric field vector lies within the plane of incidence; S-polarized light refers to S-polarized light, whose electric field vector is perpendicular to the plane of incidence. After the light is emitted from the backlight structure 1, the S-polarized light is reflected when it passes through the brightness enhancement film 22, while the P-polarized light enters the lower polarizer 2 when it passes through the brightness enhancement film 22. Specifically, the brightness enhancement film 22 improves the brightness of the TFT screen mainly based on the following principles: reflection and reuse. The brightness enhancement film 22 can reuse some of the reflected light. During the propagation of light inside the TFT screen, some light will be reflected between different film layers. The brightness enhancement film 22 can reflect this reflected light back to the light-emitting direction of the screen through a special reflective coating or structure. This is similar to "catching" the light that might otherwise be wasted and redirecting it to the direction that the user can see, further increasing the effective light emitted by the screen and improving the overall brightness. The brightness enhancement film 22 can make the light more concentrated and emit it forward, reducing light scattering and leakage. This means that blacks will be darker and whites will be brighter, thereby significantly improving the screen's contrast, making the image clearer, more vivid, and the colors more vivid.

[0038] Example 2

[0039] The liquid crystal display screen with brightness enhancement provided in Embodiment 1 is further optimized, specifically, as follows: Figure 4-5 As shown, the backlight structure 1 contains a light guide plate 7, which is located on the top surface of the reflective film 8. A microprism array 9 is arranged on the surface of the light guide plate 7. The distribution density of the microprisms in the microprism array 9 gradually increases along the direction away from the light source, and the height of the microprisms also gradually increases. Through the total internal reflection effect of the microprisms in the microprism array 9 on the light guide plate 7, large-angle scattered light (>60°) is refracted to a small angle of 0°–30° for emission, concentrating the light perpendicular to the panel direction, increasing the forward brightness by more than 40%. The density gradient distribution (sparser at the light source side and denser at the far end) compensates for the luminous flux attenuation of the LED light source, which is stronger near the light source and weaker at the far end, achieving full-area brightness. Uniformity is >85%, such as a density of 100 particles / cm² in the 0-50mm distance from the light source, 150 particles / cm² in the 50-100mm distance, and 200 particles / cm² in the 100-150mm distance. The microprism array 9 is located on the bottom surface of the light guide plate 7 with a coverage of 60%-90%, that is, the microprism array 9 is located on the surface of the light guide plate 7 away from the light emitting surface. In this example, the microprism array 9 covers 85% of the light guide plate 7 and is distributed in the visible area of ​​the liquid crystal display screen. The setting of the microprism array 9 further improves the utilization rate of light, enhances the brightening effect of the liquid crystal display screen, and improves the brightness of the liquid crystal display screen.

[0040] Example 3

[0041] The liquid crystal display screen with brightness enhancement provided in Embodiment 2 is further optimized, specifically, as follows: Figure 4-5 As shown, the distribution density of microprisms near the light source in the microprism array 9 is 25%-40% lower than that at the far end. The microprisms in the microprism array 9 are square pyramids with a height of 10-50 μm. In this example, the height of the microprism is 20 μm, and the density gradient range is 20%-50%. Specifically, the light guide plate 7 is injection molded from PMMA, and the bottom surface is formed by hot pressing to form the microprism array 9. The microprism density starts at 120 pieces / cm² from the light source side and increases towards the far end with a gradient coefficient of 0.4 pieces / cm², reaching 220 pieces / cm² at the far end. The height of the microprisms increases synchronously from 15 μm to 25 μm.

[0042] The working principle of the LCD screen with brightness enhancement provided by this utility model is as follows: By setting a brightness enhancement film 22 on the lower polarizer 2, light can be more effectively utilized after passing through the lower polarizer 2 under the action of the brightness enhancement film 22. The brightness enhancement film 22 can change the propagation path and angle of light, causing more light to gather in front, thereby improving the overall brightness of the screen, while not increasing the TFT brightness. The power consumption of the screen does not require complex modifications to the circuitry and driving system of the LCD screen 3, making it simple, easy, and low-cost. The special structure and optical characteristics of the brightness enhancement film 22 allow the screen to maintain good brightness and color performance at different viewing angles, widening the user's viewing range and enhancing the viewing angle. The brightness enhancement film 22 is very thin and lightweight, and its addition to the TFT display module will not significantly increase the module's weight and thickness, conforming to the trend of thinner and lighter electronic products. The brightness enhancement film 22 can redistribute and adjust light, making the light distribution on the screen more uniform, avoiding uneven brightness, such as some areas on the screen being too bright or too dark, improving the overall display quality and enhancing the uniformity of the LCD screen. Because the brightness enhancement film 22 can improve the utilization rate of light, the energy consumption required is lower for the same brightness requirements. This not only reduces the power consumption of electronic products and extends battery life, but also helps reduce energy waste, making it more environmentally friendly and energy-saving.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A liquid crystal display screen with a brightness enhancement effect, comprising a backlight structure, characterized in that, The backlight structure is sequentially stacked with a lower polarizer, a liquid crystal screen, an upper polarizer, and a cover plate. The cover plate is bonded and fixed to the upper polarizer with optical adhesive. A brightness enhancement film is provided on the lower polarizer. A light guide plate is provided inside the backlight structure. A microprism array is provided on the surface of the light guide plate. The distribution density of the microprisms in the microprism array gradually increases along the direction away from the light source, and the height of the microprisms also gradually increases. The microprism array is located on the bottom surface of the light guide plate and has a coverage of 60%-90%. The distribution density of the microprisms near the light source is 25%-40% lower than that at the far end. The microprisms in the microprism array are square pyramids with a height of 10-50 μm and a density gradient range of 20%-50%.

2. A liquid crystal display screen with a brightness enhancement effect according to claim 1, characterized in that, The brightness enhancement film is disposed on a surface of the lower polarizer near the backlight structure.

3. A liquid crystal display screen with a brightness enhancement effect according to claim 2, characterized in that, The brightness enhancement film and the lower polarizer are stacked together to form an integral structure.

4. A liquid crystal display screen with a brightness enhancement effect according to claim 1, characterized in that, The lower polarizer comprises a protective film, a brightness enhancement film, a lower pressure-sensitive adhesive layer, a lower TAC film, a PVA layer, an upper TAC film, an upper pressure-sensitive adhesive layer, and a release film stacked sequentially. During lamination, the brightness enhancement film is laminated to the backlight structure.

5. A liquid crystal display screen with a brightness enhancement effect according to claim 4, characterized in that, The protective film is a PET antistatic film.

6. A liquid crystal display screen with a brightness enhancement effect according to claim 4, characterized in that, The brightness enhancement film is an APF brightness enhancement film, and the thickness of the brightness enhancement film is 10-30μm.

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