Light guide plate and liquid crystal display screen

Abstract

The utility model provides a light guide plate and liquid crystal display, this light guide plate includes light guide plate body, sets up light source in at least one side of light guide plate body, has a plurality of fold reflection units in light guide plate body, the distribution density of fold reflection unit in light guide plate body is bigger along with its distance from light source is farther, adopts the mode of side -entry light not only has solved the phenomenon of trailing, and whole light guide plate luminance is even.

Description

Technical Field

[0001] This application relates to the field of liquid crystal displays, and more specifically, to a light guide plate and a liquid crystal display screen. Background Technology

[0002] In traditional LCD screen structures, the backlight structure is usually located at the bottom layer. As a result, the screen can only be lit up after all data transmission on the entire screen is completed and all liquid crystals have flipped. If any liquid crystals have not flipped up completely, there will be a ghosting effect when the screen is lit up.

[0003] It is evident that using a backlight structure will result in motion blur. To address this technical issue, a side-incident lighting technique has been introduced, such as CN205299407U, which discloses a high-mixing-light guide plate for an LED lens. The light guide plate body contains diffused light bubbles. Although this technique can solve the motion blur problem, the light emitted by the light guide plate is uneven due to the side-incident lighting method, resulting in a phenomenon where the sides are bright and the center is dark. Therefore, those skilled in the art need to improve the existing light guide plate to overcome the aforementioned technical problems. Utility Model Content

[0004] The main purpose of this application is to provide a light guide plate and a liquid crystal display screen. The side-incident light method not only solves the ghosting phenomenon, but also makes the brightness of the entire light guide plate uniform.

[0005] To achieve the above objectives, in a first aspect, this application provides a light guide plate, including a light guide plate body and a light source disposed on at least one side of the light guide plate body. The light guide plate body has a plurality of deflection units for changing the direction of light propagation, and the distribution density of the deflection units in the light guide plate body increases with the distance between them and the light source.

[0006] Optionally, the reflection unit is a lens or a light-diffusing bubble.

[0007] Optionally, the light guide plate body is composed of several lenses.

[0008] Optionally, the folding and reflecting units are of the same size and are embedded in the light guide plate body.

[0009] Optionally, the light source is symmetrically arranged on both sides of the light guide plate body.

[0010] Optionally, the light source is an LED lamp bead.

[0011] To achieve the above objectives, in a second aspect, this application provides a liquid crystal display screen, comprising, from bottom to top, the aforementioned light guide plate, diffusion film, lower polarizer, TFT layer, and liquid crystal layer.

[0012] Optionally, it may also include a color filter layer disposed on the upper surface of the liquid crystal layer.

[0013] The light guide plate and liquid crystal display screen provided by this utility model have the following advantages compared with the prior art: First, the side-incident light method solves the motion blur phenomenon caused by the traditional backlight structure. In addition, by improving the density of the folding reflection unit, the light on the entire surface of the light guide plate is more uniform. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0015] Figure 1 This is a schematic diagram of a light guide plate;

[0016] Figure 2 This is a schematic diagram of an LCD screen.

[0017] The components are: 1. light guide plate body, 2. reflector unit, 3. light source, 4. diffuser film, 5. lower polarizer, 6. TFT layer, 7. liquid crystal layer, and 8. color filter layer. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] In addition, the term "multiple" should mean two or more.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, a light guide plate includes a light guide plate body 1 and a light source 3 disposed on at least one side of the light guide plate body 1. The light source 3 is preferably an LED light source 3, i.e., an LED lamp bead. The light guide plate body 1 has a plurality of deflection units 2 for changing the direction of light propagation. The distribution density of the deflection units 2 in the light guide plate body 1 increases with the distance between them and the light source 3.

[0025] It should be noted that the reflective unit 2 can be either a refraction unit or a reflection unit. The purpose of both is to change the light emitted from the LED light sources entering from both sides to be emitted from the surface of the light guide plate.

[0026] Principle Explanation: LED light sources 3 are placed on both sides of the LCD, illuminating the center of the screen from both sides and into the light guide plate. This evenly divides the backlight on both sides into multiple areas. Taking 8 areas as an example, if the screen has a total of 3200 lines, with 400 lines as a partition, there are a total of 8 partitions. Each partition can be equipped with 8 LEDs, 4 on each side, for a total of 64 LEDs evenly arranged. When the screen synchronization signal arrives, the falling edge triggers the transmission of video data, which is sent to the panel through the screen driver IC. After the data transmission of the first 400 lines is completed, the LEDs in that partition are lit up. However, the lighting time cannot be too long; the lighting time is 1 / 10 of the refresh time of one frame, and so on. This ensures that no screen ghosting is visible at high refresh rates.

[0027] Furthermore, since the light comes in from the side, the light intensity is very high near the sides, while the light is weaker closer to the center. Therefore, it is necessary to make the light on the entire surface more uniform. This requires adjusting the density of the reflective units 2 in the light guide plate. Since the light guide plate body 1 has several reflective units 2, the density is sparser closer to the LED and denser further away from the LED. This is done to adjust the light intensity in the opposite direction, thereby making the light on the entire light guide plate more uniform.

[0028] Preferably, the reflective unit 2 is a lens or a light-diffusing bubble. In this embodiment, the reflective unit 2 is a lens. It can be that the light guide plate body 1 is composed of several lenses, and the size of the lens increases with the distance from the light source 3. That is, the light guide plate body 1 itself is composed of several lenses. The density is changed by adjusting the size of the lens. Specifically, since the light guide plate body 1 itself is equivalent to being spliced ​​together by many lenses, for the same area, the larger the size of the lens, the fewer the number of lenses that make up that area, and thus the lower the density, thereby achieving the purpose of changing the density. In specific implementation, larger lenses are used in the area of ​​the light guide plate body 1 close to the light source, while smaller lenses are used in the area far away from the light source.

[0029] Alternatively, the light guide plate body 1 may be embedded with a folding and reflecting unit 2. In this case, the folding and reflecting units 2 are of the same size, so the density can be adjusted simply by adjusting the number of folding and reflecting units 2.

[0030] Preferably, the light source 3 is symmetrically arranged on both sides of the light guide plate body 1.

[0031] like Figure 2 As shown, a liquid crystal display screen includes, from bottom to top, the light guide plate, diffusion film 4, lower polarizer 5, TFT layer 6, and liquid crystal layer 7, and further includes a color filter layer 8 disposed on the upper surface of the liquid crystal layer 7.

[0032] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A light guide plate, characterized in that, The light guide plate includes a light guide plate body and a light source disposed on at least one side of the light guide plate body. The light guide plate body has a plurality of deflection units for changing the direction of light propagation. The distribution density of the deflection units in the light guide plate body increases with the distance between them and the light source.

2. A light guide plate as described in claim 1, characterized in that: The reflection unit is a lens or a light-diffusing bubble.

3. A light guide plate as described in claim 2, characterized in that: The light guide plate body is composed of several lenses.

4. A light guide plate as described in claim 2, characterized in that: The folding and reflecting units are all the same size and are embedded in the light guide plate body.

5. A light guide plate as described in claim 1, characterized in that: The light source is symmetrically arranged on both sides of the light guide plate body.

6. A light guide plate as described in claim 1, characterized in that: The light source is an LED lamp bead.

7. A liquid crystal display screen, characterized in that: It includes, from bottom to top, the light guide plate, diffusion film, lower polarizer, TFT layer, and liquid crystal layer as described in any one of claims 1-4.

8. A liquid crystal display screen as described in claim 7, characterized in that: It also includes a color filter layer disposed on the upper surface of the liquid crystal layer.

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