Light guide plate and backlight module

Abstract

The light guide plate comprises a light guide substrate, the side face, directly facing a light source and receiving light emitted by the light source, of the light guide substrate is a light incidence face, a light incidence microstructure is arranged on the side, close to the light incidence face, of the light guide substrate, and the light incidence microstructure is composed of a row of grooves of the same structure. The projection of the grooves on the horizontal plane is of an isosceles trapezoid structure, the heights of the grooves are the same, and the bottom edges of the grooves are communicated with the light incident face. The light propagation path of the light source is changed through the light incidence microstructure on the light guide plate, so that the problem that the brightness of the light source side is not uniform due to the fact that the distance between the LEDs is increased is solved, and the brightness and the uniformity of the whole display system are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of screen display and relates to a light guide plate and a backlight module. Background Art

[0002] In today's market, end customers are increasingly demanding cost control over their products. This trend has a direct impact on backlight unit design. To reduce costs, various components are undergoing cost-reduction designs. Reducing the number of LEDs in light bars and increasing the spacing between them are common cost-control measures. However, this change presents certain challenges in the design of the backlight unit's aesthetics.

[0003] To address the issues that may arise from increased LED spacing, existing technologies typically add microstructures to the LED side of the light guide plate. These structures can improve the dimming of backlight modules, LCD panels, or LCD modules with light guide plates in areas without LEDs. However, if the product's ineffective light-emitting area is very narrow, this approach cannot effectively address the uneven brightness on the light source side caused by increased LED spacing.

[0004] As the market's dual requirements for product cost and quality continue to increase, how to solve the appearance and performance issues of the backlight module caused by the reduction in the number of LEDs in the light bar and the increase in spacing while meeting cost control has become a technical challenge that needs to be solved urgently. Utility Model Content

[0005] The purpose of the utility model is to provide a light guide plate and a backlight module, which improve the appearance and performance problems of the backlight module caused by the reduction of the number of LEDs in the light bar and the increase of the spacing by improving the structure of the light guide plate.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A light guide plate includes a light guide substrate, wherein the side of the light guide substrate facing the light source and receiving the light emitted by the light source is the light incident surface, and a light incident microstructure is provided on the side of the light guide substrate close to the light incident surface. The light incident microstructure is composed of a row of grooves with the same structure, and the projection of the grooves on the horizontal plane is an isosceles trapezoidal structure. The grooves have the same height and their bottom edges are connected to the light incident surface.

[0008] As a further improvement of an embodiment of the present invention, the light source is an LED light source, and the LED light source is located in the center of two adjacent grooves.

[0009] As a further improvement of an embodiment of the present invention, the angle between the side and the bottom of the groove is 63°.

[0010] As a further improvement of an embodiment of the present invention, the light guide substrate has a downwardly inclined surface on a side opposite to the groove, and the lowest point of the inclined surface is connected to the light incident surface.

[0011] A backlight module comprises a back plate, a light guide plate and a panel sequentially stacked on the back plate; the light guide plate adopts the light guide plate of the above structure.

[0012] The adoption of the above technical solution has the following beneficial effects: the light-entering microstructure composed of grooves of a specific shape can effectively collect and guide the light emitted by the light source. The grooves of the isosceles trapezoidal structure enable the light to propagate in a more uniform manner inside the light guide substrate after entering the light guide plate, reducing the scattering and loss of light. Secondly, the grooves of the same height ensure the stability of light conduction and will not cause uneven light distribution due to differences in the height of the grooves. Furthermore, the design of the bottom edge being connected to the light-entering surface 12 maximizes the efficiency of light entry, allowing the light guide plate to more efficiently utilize the light emitted by the light source, and changing the light propagation path of the light source through the light guide plate, thereby solving the problem of uneven brightness on the light source side caused by the increased distance between LEDs, and improving the brightness and uniformity of the entire display system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0014] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0015] Figure 1 This is a three-dimensional schematic diagram of the light guide plate and light source provided by the utility model.

[0016] Figure 2 This is a top view schematic diagram of the light guide plate and light source provided by the utility model.

[0017] Figure 3 for Figure 1 A magnified schematic diagram of area A in the middle.

[0018] Figure 4 This is a schematic diagram of the groove light path provided by the utility model.

[0019] In the picture:

[0020] 1-light guide substrate; 11-groove; 12-light incident surface; 13-inclined surface;

[0021] 2- Light source. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0024] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0025] Example

[0026] See also Figure 1-Figure 3 As shown, a light guide plate includes a light guide substrate 1, the side of the light guide substrate 1 facing the light source 2 and receiving the light emitted by the light source being a light incident surface 12. A light incident microstructure is provided on the side of the light guide substrate 1 close to the light incident surface 12. The light incident microstructure is composed of a row of grooves 11 with the same structure.

[0027] The projection of the above-mentioned groove 11 on the horizontal plane is an isosceles trapezoidal structure. The height of each groove 11 is the same, which ensures the stability and consistency of the light during the transmission process. In addition, the bottom edge of the groove 11 is connected to the light incident surface 12, so that the light emitted by the light source can smoothly enter the groove 11, and then be efficiently transmitted and scattered inside the light guide substrate 1. At the same time, the groove 11 can change the path of the light originally transmitted to the adjacent light source and transmit it to a position without a light source (such as Figure 4 As shown), the problem of uneven brightness on the light source side can be solved.

[0028] In this embodiment, the light source 2 is an LED light source, and the LED light source is located in the center of two adjacent grooves. When the LED light source is in this position, it can project light into the groove more accurately. Since the projection of the groove 11 on the horizontal plane is an isosceles trapezoidal structure, the central placement of the LED light source allows light to enter each groove evenly, thereby achieving efficient conduction and scattering inside the light guide substrate 1. This layout ensures a more uniform distribution of light in the light guide plate, reduces the phenomenon of uneven brightness, provides a more stable and high-quality backlighting for the display device, improves the clarity and color saturation of the display image, greatly enhances the user's visual experience, and significantly improves the performance of the entire display system.

[0029] Specifically, the angle between the side and bottom of the groove 11 is limited to a range of 41° to 85°. When the angle is in this range, the collection and conduction of light emitted by the light source 2 can be better achieved. Among them, the preferred angle is 63°. At this angle, the light guide plate has a better light processing effect. Light can enter the groove 11 in a more appropriate manner, and after reflection and scattering by the groove, it is evenly distributed inside the light guide substrate. Such a design enables the light guide plate to provide high-quality backlight for display devices in actual applications, reduce light loss and unevenness, improve the quality and visual effects of the display image, and bring a more comfortable visual experience to users.

[0030] In this embodiment, a downwardly inclined inclined surface 13 is provided on the side of the light guide substrate opposite to the groove, and the low point of the inclined surface 13 is connected to the light incident surface 12. When light enters the light guide substrate 1 from the light incident surface 12, part of the light will be guided by the inclined surface 13 and propagated and scattered at a more reasonable angle. Such a design helps to improve the efficiency of light utilization and reduce the loss of light during the conduction process. At the same time, the presence of the inclined surface 13 also makes the light distribution inside the light guide plate more uniform, avoiding local overbrightness or overdarkness, providing more stable and high-quality backlighting for the display device, and improving the display effect and the user's visual experience.

[0031] The light guide plate of the present invention has many advantages. First, the light-entering microstructure composed of grooves 11 of a specific shape can effectively collect and guide the light emitted by the light source. The grooves of the isosceles trapezoidal structure enable the light to propagate inside the light guide substrate in a more uniform manner after entering the light guide plate, reducing the scattering and loss of light. Secondly, the grooves of the same height ensure the stability of light conduction and will not cause uneven light distribution due to differences in groove heights. Furthermore, the design of the bottom edge being connected to the light-entering surface 12 maximizes the efficiency of light entry, allowing the light guide plate to more efficiently utilize the light emitted by the light source, thereby solving the problem of uneven brightness on the light source side due to the increased spacing between LEDs, thereby improving the brightness and uniformity of the entire display system.

[0032] A backlight module comprises a backplate, a light guide plate stacked on the backplate in sequence, and a panel. The light guide plate adopts the light guide plate of the above structure. This light guide plate has a light guide substrate, the side of which facing the light source is the light incident surface, and a light incident microstructure consisting of a row of grooves with the same structure is provided on the side close to the light incident surface. The projection of the grooves on the horizontal plane is an isosceles trapezoidal structure with the same height and the bottom edge connected to the light incident surface. In addition, the light source is an LED light source, which is located in the center of two adjacent grooves. The angle between the side and the bottom edge of the groove is between 41° and 85°, preferably 63°. The light guide substrate has a downward inclined surface on the side opposite to the groove, and its low point is connected to the light incident surface. Such a light guide plate can efficiently collect and transmit light, so that the backlight module provides uniform and stable backlight for the panel, improving the display effect and user visual experience.

[0033] In practical applications, the light guide plate can be widely used in various display devices, such as liquid crystal displays, tablet computers, mobile phones, etc. It can provide high-quality backlighting for these devices, making the display clearer and brighter, while also improving the user's visual experience.

[0034] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0036] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A light guide plate, characterized in that: It includes a light-guiding substrate, a side of the light-guiding substrate facing the light source and receiving the light emitted by the light source being the light incident surface, and a light incident microstructure is provided on the side of the light-guiding substrate close to the light incident surface, and the light incident microstructure is composed of a row of grooves with the same structure, and the projection of the grooves on the horizontal plane is an isosceles trapezoidal structure, the grooves have the same height and their bottom edges are connected to the light incident surface.

2. The light guide plate according to claim 1, wherein: The light source is an LED light source, and the LED light source is located in the center of two adjacent grooves.

3. The light guide plate according to claim 2, wherein: The included angle between the side and bottom of the groove is 63°.

4. The light guide plate according to claim 2, wherein: The light guide substrate has a downwardly inclined surface on a side surface opposite to the groove, and the lowest point of the inclined surface is connected to the light incident surface.

5. A backlight module comprising a back plate, a light guide plate and a panel stacked on the back plate in sequence, characterized in that: The light guide plate is the light guide plate according to any one of claims 1 to 4.

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