Light guide device with corner brightness compensation structure, backlight module and display device

Abstract

A backlight module includes a light source, a light guide plate, and a light guide device. The light guide plate has a light-in end edge and a first side edge. The light-in end edge is configured to face the light source and receive light from the light source. The first side edge extends from one end of the light-in end edge in a direction transverse to the light-in end edge. The light guide device has a first end portion and a second end portion. The light guide device is disposed along the first side edge. The first end portion faces the light source and receives light from the light source. The second end portion corresponds to a distal end of the first side edge opposite the light-in end edge. The second end portion is located on a side of the light guide plate opposite the light-in end edge. The light guide device guides at least the light incident from the light source to be emitted from the second end portion and to reach the distal end of the first side edge.

Description

Technical Field

[0001] This invention relates to a backlight module, and more specifically, to a backlight module with a corner brightness compensation structure. Background Technology

[0002] Generally speaking, the brightness of the corners on both sides (also known as the top and bottom sides) of the backlight module is lower than that of other parts of the light guide plate, which is commonly referred to as vignetting. Especially for injection light guide plates, the light transfer rate of the dot matrix at the corners on both sides of the glue inlet is relatively low, which makes it easier to exacerbate the dimness of the corners of the light guide plate.

[0003] Currently, backlight modules in automotive devices are gradually incorporating full-scan specifications using charge-coupled devices (CCDs). Generally, the measurement range of a full scan is quite close to the corner edges of the image. Whether the brightness of the two corners of the backlight module can be supplemented is a technical problem faced in improving the uniformity of the charge-coupled device. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a backlight module comprising a light source, a light guide plate, an optical film layer, and a light guiding device. The light guide plate has an incident light edge and a first side edge. The incident light edge is configured to face the light source and receive light from it, and the first side edge extends from one end of the incident light edge along a direction transverse to the incident light edge. The optical film layer is disposed on the light guide plate. The light guiding device has a first end and a second end, and is configured to extend along the first side edge. The first end faces the light source and receives light from it, and the second end corresponds to the distal end of the first side edge opposite to the incident light edge, and is located on the side of the light guide plate opposite to the incident light edge. The light guiding device guides light incident from the light source to the second end for emission, and to the distal end of the first side edge.

[0005] An embodiment of the present invention provides a light guide device, comprising a body, a first end, and a second end. The body extends along the side edge of a light guide plate. The first end is connected to the body and is configured to face a light source and receive light from the light source. The second end is connected to the body and is disposed at the distal end opposite the first end, wherein light incident from the light source to the first end exits the light guide device via the body and the second end and is incident on a corner of the light guide plate.

[0006] An embodiment of the present invention also provides a display device, including the backlight module described above and a display panel disposed on the light-emitting side of the backlight module.

[0007] Compared with the efficacy of existing technologies

[0008] According to the embodiments of the present invention, the backlight module and display device can guide the light incident from the light source to the first end and the second end through the light guide device, and reach the two ends of the first side edge of the light guide plate, so as to enhance the brightness of the two side corners of the backlight module and improve the uniformity of the charge coupling element. Attached Figure Description

[0009] To make the above and other objects, features, advantages, and embodiments of the present invention more apparent and understandable, the accompanying drawings are described below:

[0010] Figure 1A This is a front view schematic diagram of a backlight module according to an embodiment of the present invention.

[0011] Figure 1B This is a front view schematic diagram of a backlight module according to another embodiment of the present invention.

[0012] Figures 1C to 1E This is a schematic side view illustrating different configurations of the optical film layer according to an embodiment of the present invention.

[0013] Figure 2A This is a simulated front view of the light trail at the second end of the left-side light guide device according to an embodiment of the present invention.

[0014] Figure 2B This is a simulated front view of the light trails at the first and second ends of the left-side light guide device according to an embodiment of the present invention.

[0015] Figures 3A to 3C This is a front view of the light-emitting front of a light guide device according to an embodiment of the present invention.

[0016] Figure 4 This is a front view schematic diagram of the light-emitting surface angle of a light guide device according to an embodiment of the present invention.

[0017] Figure 5 This is a three-dimensional schematic diagram of the thickness of the light guide device and light guide plate according to an embodiment of the present invention.

[0018] Figure 6A This is a schematic diagram of the microstructure region of a light guide device according to an embodiment of the present invention.

[0019] Figure 6B This is an enlarged schematic diagram of the microstructure region of a light guide device according to an embodiment of the present invention.

[0020] Figure 7 This is a simulation result chart of the illuminance example at the corner of the backlight module according to an embodiment of the present invention.

[0021] Figure 8 This is a front view schematic diagram of the light source configuration of a backlight module according to an embodiment of the present invention.

[0022] Figure 9 This is a side view of a display device including a backlight module according to an embodiment of the present invention.

[0023] In the attached figures, the following labels are used:

[0024] 1: Display device

[0025] 10: Backlight Module

[0026] 20: Display panel

[0027] 100: Light source

[0028] 110: Light Emitting Diode

[0029] 200: Light guide plate

[0030] 210: Edge of the light source

[0031] 220: First lateral edge

[0032] 221: Proximal

[0033] 222: Remote

[0034] 230: First lateral edge

[0035] 231: Proximal

[0036] 232: Remote

[0037] 240: Air layer

[0038] 300: Optical film layer

[0039] 351: Diffusion sheet

[0040] 352: Light Collector

[0041] 353: Reflective polarizing brightening film

[0042] 301: Light guide device

[0043] 310: Ontology

[0044] 311: First end

[0045] 312: Second end

[0046] 302: Light guide device

[0047] 320: Ontology

[0048] 321: First end

[0049] 322: Second end

[0050] 323: Reflective layer

[0051] 331: First light-emitting surface

[0052] 332: Second light-emitting surface

[0053] D1: Thickness of light guide device

[0054] D2: Light guide plate thickness

[0055] A1: Microstructural region

[0056] A2: Microstructural Region

[0057] C1: Concave structure

[0058] C2: Convex structure Detailed Implementation

[0059] Various embodiments will be described in this specification, and those skilled in the art should be able to easily understand the spirit and principles of the invention by referring to the description and accompanying drawings. Here, the elements or portions depicted in the drawings may be exaggerated or varied for clarity. Therefore, those skilled in the art should understand that the dimensions and relative proportions of the elements or portions depicted in the drawings are not the actual dimensions and relative proportions of the elements or portions. Furthermore, although some specific embodiments will be specifically described herein, these embodiments are merely illustrative and are not to be considered limiting or exhaustive in any way. Therefore, various changes and modifications to the invention should be obvious and easily achievable by those skilled in the art without departing from the spirit and principles of the invention.

[0060] It should be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another. Therefore, the “first element,” “component,” “region,” “layer,” or “part” discussed below may be referred to as a second element, component, region, layer, or part without departing from the teachings of this document.

[0061] Reference Figure 1AThis is a front view schematic diagram of a backlight module according to an embodiment of the present invention. As shown, the backlight module 10 provided in the embodiment of the present invention includes a light source 100, a light guide plate 200, an optical film layer 300, and a light guiding device 301. The light guide plate 200 has an incident light edge 210 and a first side edge 220. The incident light edge 210 is configured to face the light source 100 and receive light from the light source 100. In other words, the incident light edge 210 is the side of the light guide plate 200 close to the light source 100. The first side edge 220 of the light guide plate 200 extends from one end of the incident light edge 210 along a direction that cuts across the incident light edge 210. In other words, the light-incident edge 210 of the light guide plate 200 can extend along a direction parallel to the X-axis, as shown in Figure 1. The first side edge of the light guide plate 200 can be the side of the light guide plate 200 adjacent to the light-incident edge 210, such as the first side edge 220 on the left side of the light guide plate 200 or the first side edge 230 on the right side of the light guide plate 200. The first side edge can extend along a direction perpendicular to the light-incident edge 210, that is, along a direction parallel to the Y-axis (the incident direction of the light emitted by the light source 100). The optical film layer 300 is disposed on the light guide plate 200.

[0062] The light guide device of the backlight module 10 can be configured to extend along the direction of the first side edge, that is, to extend in a direction parallel to the Y-axis in FIG1, for example, a light guide device 301 near the left side of the light guide plate 200, or a light guide device 302 near the right side of the light guide plate 200. The light guide device 301 has a body 310, a first end 311, and a second end 312, and the light guide device 302 has a body 320, a first end 321, and a second end 322. The body 310 extends along the direction parallel to the first side edge 220 on the left side of the light guide plate 200, and the body 320 extends along the direction parallel to the first side edge 230 on the right side of the light guide plate 200. The first end 311 and the first end 321 face the light source 100 and receive light from the light source 100, that is, the position of the first end 311 is close to the proximal end 221 of the first side edge 220 of the light guide plate 200, and the position of the first end 321 is close to the proximal end 231 of the first side edge 230 of the light guide plate 200. The second end 312 and the second end 322 are located on the side away from the light-incident edge 210 of the light guide plate 200. That is, the second end 312 corresponds to the far end 222 of the first side edge 220 of the light guide plate 200 opposite to the far end 222 of the light-incident edge 210, and the second end 322 corresponds to the far end 232 of the first side edge 230 of the light guide plate 200 opposite to the far end 232 of the light-incident edge 210. Figure 1A As shown.

[0063] Next refer to Figure 1B This is a front view schematic diagram of a backlight module according to another embodiment of the present invention. The configuration of the backlight module 10, light source 100, light guide plate 200, optical film layer 300, and light guide devices 301 and 302 in this embodiment is similar to... Figure 1A The implementation methods are the same and will not be repeated here. Figure 1A and Figure 1B The difference in the embodiments is that, Figure 1A In the light guide device 301, the first end 311 is rectangular. After the light emitted from the light source 100 enters the light guide device 301, it almost never exits the light guide plate 200 from the first end 311. Instead, it exits the light guide plate 200 from the side furthest from the light-incident edge 210, i.e., the second end 312. Figure 1B In this light guide, the light emitted from the light source 100 enters the light guide device 301 and exits at the first end 321 and the second end 322 onto the light guide plate 200. Similarly, the light guide device 302 on the right side of the light guide plate 200 is the same as the light guide device 301 on the left side, and will not be described again. The specific details of the first end 321 and the second end 322 will be described in detail in later paragraphs.

[0064] See Figures 1C to 1E This is a schematic side view illustrating different configurations of the optical film layer according to an embodiment of the present invention. The specific structure of the aforementioned optical film layer 300 disposed on the light guide plate 200 can be implemented as various combinations of a diffuser, a light collector, and a polarizing brightening film. For example, the optical film layer 300 can be composed of a diffuser 351, a light collector 352, and a reflective polarizing brightening film 353 sequentially stacked on the light guide plate 200, such as... Figure 1C As shown. Alternatively, the optical film layer 300 may consist solely of a diffuser 351 and a light collector 352 stacked on the light guide plate 200, as shown. Figure 1D As shown. Alternatively, the optical film layer 300 can be formed by alternately stacking diffuser 351 and light collector 352 on the light guide plate 200, as shown. Figure 1E As shown. It should be noted that the number of diffuser 351, light collector 352 and reflective polarizing brightening film 353 included in optical film layer 300 is only an example and not a limitation.

[0065] Reference Figure 2A and 2B ,in Figure 2A This is a simulated front view of the light trail at the second end of the left-side light guide device according to an embodiment of the present invention, and is... Figure 2B A simulated front view of the light trails at the first and second ends of the left-side light guide device according to an embodiment of the present invention. Figure 2A In the backlight module 10, after the light guide device 301 receives light incident from the light source 100, it guides the light along the direction of the body 310 of the light guide device 301 to the second end 312, and then emits the light to the corner of the first side edge 220 of the light guide plate 200 away from the light source, such as... Figure 2A The light trail simulation is shown in the image. Furthermore, in... Figure 2BIn the backlight module 10, after the light guide device 301 receives light incident from the light source 100, it guides the light along the direction of the body 310 of the light guide device 301 to the second end 312, and then emits the light to the corner of the first side edge 220 of the light guide plate 200 away from the light source 100, or the light is emitted from the first end 311 to the corner of the first side edge 220 of the light guide plate 200 near the light source 100, such as... Figure 2B The light trail simulation is shown in the figure. The light guide device 301 and light guide device 302 in the backlight module 10 can effectively enhance the brightness of the two corners of the light guide plate 200 of the backlight module 10.

[0066] In the above-described arrangement of the light source 100, the light source 100 can be extended along the direction of the light-incident edge 210 of the light guide plate 200, that is, parallel to the X-axis in Figure 1. The light source 100 extends at least partially to the left beyond the light-incident edge 210 of the light guide plate 200, opposite to the first end 311 of the light guide device 301, or extends to the right beyond the light-incident edge 210 of the light guide plate 200, opposite to the first end 321 of the light guide device 302. Specifically, the light source 100 can be implemented as a light strip containing multiple light-emitting diodes 110, such as a micro organic light-emitting diode (micro OLED) or a micro light-emitting diode (micro LED). Multiple light-emitting diodes 110 can be arranged along the direction of the light-incident edge 210 of the parallel light guide plate 200, and at least one light-emitting diode 110 is configured to face the first end 311 of the light guide device 301, or at least one light-emitting diode 110 is configured to face the first end 321 of the light guide device 302, such as... Figure 1A and Figure 1B As shown.

[0067] To effectively improve the brightness of the two corners of the light guide plate 200, the light guide device 301 or 302 may not be in direct contact with the light guide plate 200; instead, an air layer 240 is provided between the light guide device 301 or 302 and the light guide plate 200. Since the refractive index of air is generally lower than that of glass materials such as the light guide plate 200, light guide device 301, and light guide device 302, total internal reflection is more likely to occur at the interface between the light guide device 301 or 302 and the air layer 240 when the light emitted by the LED 110 enters the light guide device 301 or 302. In other words, light is less likely to leak from the light guide device 301 to the outside when propagating from the first end 311 to the second end 312 of the light guide device 301, or less likely to leak from the light guide device 302 to the outside when propagating from the first end 321 to the second end 322 of the light guide device 302. Figure 1A and Figure 1B As shown.

[0068] Reference Figures 3A to 3C This is a frontal view of the light-emitting surface of the light guide device according to an embodiment of the present invention. Further, to improve the brightness of the light guide plate 200 at both corners, the first end 311 of the light guide device 301 on the left side of the light guide plate 200 can be configured to face the first light-emitting surface 331 of the first side edge 220 of the light guide plate 200. The shape of the first light-emitting surface 331 can be configured such that the end closest to the light source 100 is closer to the light guide plate 200, and the other end farther from the light source 100 is farther from the light guide plate 200 (i.e., a slope), such as... Figure 3A As shown. Furthermore, the first light-emitting surface 331 of the light guide device 301 can be implemented in various shapes, such as... Figure 3A The first light-emitting surface 331 is an inclined surface. Figure 3B The first light-emitting surface 331 is a plane with a right angle at the turning point. Figure 3C The first light-emitting surface 331 is a curved surface.

[0069] Similarly, the second end 312 of the light guide device 301 on the left side of the light guide plate 200 can be configured as a second light-emitting surface 332 facing the first side edge 220 of the light guide plate 200. The shape of the second light-emitting surface 332 can be configured such that the end furthest from the light source 100 is closer to the light guide plate 200, and the end closer to the light source 100 is farther from the light guide plate 200. Figure 3A As shown. The second light-emitting surface 332 of the light guide device 301 can also be implemented in various shapes, such as the first light-emitting surface 331. Figure 3A The second light-emitting surface 332 is an inclined surface. Figure 3B The second light-emitting surface 332 is a plane with a right angle at the turning point. Figure 3CThe second light-emitting surface 332 is curved. Similarly, the configuration of the light guide device 302 on the right side of the light guide plate 200 is similar to that of the light guide device 301 on the left side of the light guide plate 200, and will not be described in detail here.

[0070] exist Figure 3A and Figure 3C In this light guide device, because the first light-emitting surface 331 and the second light-emitting surface 332 are configured as inclined or curved surfaces, when light propagates to the areas of the first end 311 and the second end 312, it will enter the first light-emitting surface 331 and the second light-emitting surface 332 at various different angles, thus increasing the probability that light will exit to the corners of the light guide plate 200. Figure 3B In this light guide device 301, since it is generally elongated, the first light-emitting surface 331 and the second light-emitting surface 332 are set as planes. When light propagates in the light guide device to the regions at the first and second ends, the angle change of the incident light on the first light-emitting surface 331 and the second light-emitting surface 332 is relatively small compared to the previous state. Figure 3A and Figure 3C Smaller in the middle. Therefore, in Figure 3B In this light guide device, a microstructure region A1 can be provided on the side of the first end 311 away from the first side edge 220 of the light guide plate 200, and a microstructure region A2 can be provided on the side of the second end 312 away from the first side edge 220 of the light guide plate 200. When light propagates in the light guide device to the regions of the first end 311 and the second end 312, it will exit from the non-uniform structures such as the microstructure region A1 and the microstructure region A2 at different angles, and then enter the first light emitting surface 331 and the second light emitting surface 332 at different angles, increasing the probability of light emitting to the corner of the light guide plate 200.

[0071] Furthermore, in one embodiment, the shape of the first side edge 220 on the left side of the light guide plate 200 can be different from the shape of the light guide device 301, such as matching shapes, but not limited thereto. Specifically, at the proximal end 221 of the first side edge 220 on the left side of the light guide plate 200 connected to the light-incident end edge 210, it can have the same shape as the first light-emitting surface 331 of the light guide device 301. For example, the proximal end 221 of the first side edge 220 on the left side of the light guide plate 200 and the first light-emitting surface 331 of the light guide device 301 are inclined surfaces with the same inclination angle, such as... Figure 3A As shown. Alternatively, the shape of the proximal end 221 and the first light-emitting surface 331 is a plane that is perpendicular to the plane at the turning point, as shown. Figure 3B As shown. Alternatively, the shape of the proximal end 221 is a curved surface with the same curvature as the shape of the first light-emitting surface 331, such as... Figure 3C As shown.

[0072] Similarly, the first side edge 220 on the left side of the light guide plate 200, at its distal end 222, can have a matching shape with the second light-emitting surface 332 of the light guide device 301. For example, the shape of the distal end 222 and the second light-emitting surface 332 is as follows: Figure 3A Inclined surfaces with the same angle of inclination, or as Figure 3B The plane at the turning point is a right angle, or like... Figure 3C The curved surfaces have the same bending method. Similarly, the near and far ends of the first side edge on the right side of the light guide plate 200 and the first and second light-emitting surfaces of the right light guide device are similar in shape and configuration to the first side edge 220 on the left side of the light guide plate 200 and the first light-emitting surface 331 and the second light-emitting surface 332 of the light guide device 301, which will not be described in detail here.

[0073] Reference Figure 4 This is a front view schematic diagram of the light-emitting surface angle of the light guide device according to an embodiment of the present invention. As shown in the figure, in order to increase the brightness of the two corners of the light guide plate 200, when the first light-emitting surface 331 of the light guide device 301 on the left side of the light guide plate 200 is an inclined surface, different inclined surface angles can be configured to achieve better results. For example, the angle between the extension direction of the first light-emitting surface 331 and the virtual surface P extending from the first side edge 220 of the light guide plate 200 is between 30 degrees and 60 degrees, so that when the light is emitted from the first light-emitting surface of the light guide device 301, there is a higher probability that it will reach the corner of the light guide plate 200.

[0074] Similarly, when the second light-emitting surface 332 of the light guide device 301 on the left side of the light guide plate 200 is an inclined surface, different inclined surface angles are also configured to achieve better results. For example, the average angle between the extension direction of the second light-emitting surface 332 and the virtual surface extending from the first side edge 220 of the light guide plate 200 is between 30 degrees and 60 degrees. Likewise, the angle configuration of the first and second light-emitting surfaces of the light guide device on the right side of the light guide plate 200 is similar to that of the first light-emitting surface 331 and the second light-emitting surface 332 of the light guide device 301 on the left side of the light guide plate 200, and will not be elaborated here. In addition, if the first light-emitting surface 331 and the second light-emitting surface 332 are curved surfaces, the tangent plane passing through the center point of the curved surface can be used as the extension direction of the first light-emitting surface 331 and the second light-emitting surface 332, and the angle between it and the virtual surface extending from the first side edge 220 of the light guide plate 200 is also between 30 degrees and 60 degrees (not shown in the figure).

[0075] Reference Figure 5This is a three-dimensional schematic diagram of the thickness of the light guide device and light guide plate according to an embodiment of the present invention. As shown in the figure, considering the effect of the overall light guide device 301 on increasing the brightness of the corners of the light guide plate 200, when the thickness D1 of the light guide device 301 is configured to be less than or equal to the thickness D2 of the light guide plate 200, the proportion of light rays reaching the corners of the light guide plate 200 after exiting the light guide device 301 is higher, resulting in higher improvement efficiency. If the thickness D1 of the light guide device 301 is configured to be greater than the thickness D2 of the light guide plate 200, and other conditions are not modified accordingly, some light rays will be lost after exiting the light guide device 301, resulting in a lower proportion reaching the corners of the light guide plate 200 and lower improvement efficiency. Similarly, the thickness configuration of the light guide device on the right side of the light guide plate 200 is similar to that of the light guide device 301, and will not be described in detail here.

[0076] Besides adjusting the thickness of the light guide device to increase the brightness at the corners of the light guide plate 200, other implementation methods can also achieve this. (See reference...) Figure 6A and Figure 6B ,in Figure 6A This is a schematic diagram of the microstructure region of a light guide device according to an embodiment of the present invention. Figure 6B This is an enlarged schematic diagram of the microstructure region of a light guide device according to an embodiment of the present invention. The light guide device 301 on the left side of the light guide plate 200 may have a microstructure region A1 in a corner region near the light guide plate 200, such as the first end 311. Figure 6B As shown. When the light emitted by the light-emitting diode 110 of the light source 100 enters the light guide device 301, and the light is incident on the microstructure region A1 of the first end 311 during propagation, it will exit from the first light-emitting surface 331 at different angles, such as... Figure 6A As shown.

[0077] The microstructure region A1 can be located on the side of the first end 311 opposite to the first side edge 220 of the light guide plate 200. In other words, the side of the first end 311 of the light guide device 301 facing the light guide plate 200 is the first light-emitting surface 331, and the side facing away from the light guide plate 200 is the microstructure region A1, such as... Figure 6A As shown. Detailed structure within microstructural region A1 can be found in [reference needed]. Figure 6B As shown, it includes a concave structure C1 and a convex structure C2. When light propagates within the light guide device 301 and is incident on the microstructure region A1 of the first end 311, the irregular structures such as the concave structure C1 and the convex structure C2 cause the light to reach the first light-emitting surface 331 at different incident angles. This reduces the chance of the light undergoing total internal reflection at the first light-emitting surface 331 and continuing to propagate within the light guide device 301. In other words, it increases the chance of light escaping from the first light-emitting surface 331, thereby increasing the brightness of the corners of the light guide plate 200.

[0078] Similarly, the light guiding device 301 on the left side of the light guide plate 200 may have a microstructure region A2 in the corner area near the light guide plate 200, such as the second end 312. In other words, the side of the second end 312 of the light guiding device 301 facing the light guide plate 200 is the second light emitting surface 332, and the side facing away from the light guide plate 200 is the microstructure region A2, such as... Figure 6B As shown. When the light emitted by the light-emitting diode 110 of the light source 100 enters the light guide device 301, and the light is incident on the microstructure region A2 of the second end 312 during propagation, it will exit from the second light-emitting surface 332 at different angles, such as... Figure 6A As shown. The microstructure region A2 can be disposed on the side of the second end 312 opposite to the first side edge 220 of the light guide plate 200. In other words, the microstructure region A2 can be disposed on the side of the second end 312 farther from the first side edge 220 of the light guide plate 200, such as... Figure 6A As shown.

[0079] The detailed structure within microstructure region A2 is also referenced. Figure 6B As shown, it includes a concave structure C1 and a convex structure C2. When light propagates within the light guide device 301 and is incident on the microstructure region A2 of the second end 312, the irregular structures such as the concave structure C1 and the convex structure C2 cause the light to reach the second light-emitting surface 332 at different incident angles. This reduces the chance of the light undergoing total internal reflection at the second light-emitting surface 332 and continuing to propagate within the light guide device 301. In other words, it increases the chance of light escaping from the second light-emitting surface 332, thus increasing the brightness of the corners of the light guide plate 200. Furthermore, the microstructure density in the microstructure region A2 can be greater than that in the microstructure region A1, allowing some light to be transmitted to the second end 312 instead of escaping from the first end 311, thereby balancing the amount of light emitted from the first end 311 and the second end 312.

[0080] Similarly, the microstructure regions at the first and second ends of the light guide device on the right side of the light guide plate 200, and their detailed structures, are similar to those of the light guide device 301, and will not be described in detail here. Furthermore, besides using irregular microstructures to disrupt total internal reflection of light within the light guide device to increase the brightness of the corners of the light guide plate 200, other implementation methods can also achieve this. For example... Figure 6B As shown, a reflector 323 is provided at the second end 312 of the light guide device 301 on the left side of the light guide plate 200 to prevent light from escaping from a position other than the second light-emitting surface 332 of the second end 312, thereby improving the light utilization rate.

[0081] Specifically, a reflective sheet 323 can be provided on the end face that cuts across the extension direction of the light guide device 301. In other words, the reflective sheet 323 is provided on the XZ plane perpendicular to the Y-axis at the second end 312 of the light guide device 301. When light emitted from the light-emitting diode 110 of the light source 100 enters the light guide device 301 and propagates along the Y-axis, the light has a chance to exit to the outside of the light guide device 301 along the Y-axis. That is, the probability of light exiting from the second light-emitting surface 332 of the second end 312 of the light guide device 301 to the corner of the light guide plate 200 is reduced. When the reflective sheet 323 is provided on the XZ plane perpendicular to the Y-axis at the second end 312 of the light guide device 301, the light propagating along the Y-axis will be reflected back into the interior of the light guide device 301.

[0082] Therefore, the probability of light emanating from the first light-emitting surface 331 and the second light-emitting surface 332 and reaching the corner of the light guide plate 200 will be increased, and the technical problem of dim brightness in the corner of the light guide plate 200 can be improved. Similarly, the implementation of providing a reflective layer at the second end of the light guide device on the right side of the light guide plate 200 to prevent light from emanating from a position other than the second light-emitting surface at the second end is similar to that of the light guide device 301, and will not be described in detail here.

[0083] Reference Figure 7 The figure shows a simulation result chart of the illuminance of a corner of a backlight module according to an embodiment of the present invention. As shown in the figure, when the backlight module 10 does not include the light guide device of the embodiment of the present invention, its overall illuminance uniformity is only 37%. Furthermore, when the backlight module 10 does not include the light guide device of the embodiment of the present invention, the relative illuminance of the corner of the light guide plate 200 away from the light-incident edge 210, i.e., the relative illuminance of the far end 222 and far end 232 (or the sky side) in FIG. 1, is set to 100%, and the relative illuminance of the corner of the light guide plate 200 close to the light-incident edge 210, i.e., the relative illuminance of the near end 221 and far end 231 (or the ground side) in FIG. 1, is set to 100% as a control group.

[0084] Next, when the backlight module 10 includes the light guide device of the embodiment of the present invention, the first light-emitting surface 331 and the second light-emitting surface 332 are at an angle (i.e., Figure 1B As an example of the experimental group, it can be found that regardless of the width of the light guide device (conditions one to three are 1 mm, 2 mm, and 3 mm respectively, i.e., the width along the X-axis in Figure 1), the uniformity of the overall illuminance is greater than 65%, showing a significant improvement effect. Furthermore, the relative illuminance values ​​at the top corners are all greater than 150%, and the relative illuminance values ​​at the bottom corners are all greater than 190%. Therefore, the technical problems of dim brightness at the corners of the light guide plate 200 of the backlight module 10 and insufficient uniformity are improved.

[0085] Furthermore, the problem of dim brightness at the corners of the light guide plate 200 can be improved by different configurations of the light source 100 in the backlight module 10. (Refer to...) Figure 8 This is a front view schematic diagram of the light source configuration of a backlight module according to an embodiment of the present invention. As shown, the distribution density of the light-emitting diodes 110 of the light source 100 can be adjusted. For example, a higher density of light-emitting diodes 110 can be arranged near the light guide device 301, pointing towards the light guide device 301, or a higher density of light-emitting diodes 110 can be arranged near the light guide device 302, pointing towards the light guide device 302. This increases the amount of light received by the light guide devices 301 / 302, thereby improving the brightness of the corners of the light guide plate 200.

[0086] According to an embodiment of the present invention, the backlight module 10 described above can be applied to a display device 1. (Refer to...) Figure 9 This is a side view of a display device including a backlight module according to an embodiment of the present invention. As shown, the display panel 20 can be disposed on the light-emitting side of the backlight module 10 to obtain an image with uniform overall brightness.

[0087] The above description is merely a few preferred embodiments of the present invention. It should be noted that various changes and modifications can be made to the present invention without departing from its spirit and principles. Those skilled in the art will understand that the present invention is defined by the appended claims, and that various possible substitutions, combinations, modifications, and uses, etc., do not exceed the scope defined by the appended claims, provided they conform to the intent of the present invention.

Claims

1. A backlight module, characterized in that, Include: One light source; A light guide plate has a light-incident end edge and a first side edge, wherein the light-incident end edge is configured to face the light source and receive light from the light source, and wherein the first side edge extends from one end of the light-incident end edge in a direction transverse to the light-incident end edge. An optical film layer is disposed on the light guide plate; and A light guide device is provided extending along the first side edge and having a first end and a second end; wherein the first end faces the light source and receives light from the light source, and the second end corresponds to a distal end of the first side edge opposite to the light-incident end edge and is located on the side of the light guide plate opposite to the light-incident end edge; The light guiding device guides light rays incident from the light source to the second end for emission, and to the far end of the first side edge.

2. The backlight module as described in claim 1, characterized in that, The light source extends along the light-incident edge and at least partially extends beyond the light-incident edge, opposite to the first end.

3. The backlight module as described in claim 2, characterized in that, The light source is a light strip containing a plurality of light-emitting diodes (LEDs), and the LEDs extend in a direction parallel to the light-incident edge. At least one of the LEDs is configured to face the first end.

4. The backlight module as described in claim 1, characterized in that, An air layer is sandwiched between the light guide plate and the light guide device.

5. The backlight module as described in claim 1, characterized in that, The first end has a first light-emitting surface facing the first side edge, and the end of the first light-emitting surface that is closer to the light source protrudes towards the light guide plate than the other end.

6. The backlight module as described in claim 5, characterized in that, The first light-emitting surface is formed as an inclined surface or a curved surface.

7. The backlight module as described in claim 5, characterized in that, The first side edge has a proximal end connected to the light-incident end edge, and at least a portion of the proximal end matches the shape of the first light-emitting surface.

8. The backlight module as described in claim 5, characterized in that, The average angle between the first light-emitting surface and a virtual surface extending from the first side edge ranges from 30 degrees to 60 degrees.

9. The backlight module as described in claim 1, characterized in that, The second end has a second light-emitting surface facing the first side edge, and the end of the second light-emitting surface that is farther away from the light source is closer to the light guide plate than the other end.

10. The backlight module as described in claim 9, characterized in that, The second light-emitting surface is formed as an inclined surface or a curved surface.

11. The backlight module as described in claim 9, characterized in that, At least a portion of the distal end matches the shape of the second light-emitting surface.

12. The backlight module as described in claim 9, characterized in that, The average angle between the second light-emitting surface and a virtual surface extending from the first side edge ranges from 30 degrees to 60 degrees.

13. The backlight module as described in claim 1, characterized in that, The thickness of the light guide device is less than or equal to the thickness of the light guide plate.

14. The backlight module as described in claim 1, characterized in that, The first end has a first microstructure region disposed on the side opposite to the first side edge.

15. The backlight module as described in claim 1, characterized in that, The second end has a second microstructure region disposed on the side opposite to the first side edge.

16. The backlight module as described in claim 3, characterized in that, The second end has an end face that cuts through the extension direction of the light guide device, and a reflective sheet is provided on the end face.

17. A light guiding device, characterized in that, Include: A single body extends along the side edge of a light guide plate; A first end, connected to the body, wherein the first end is configured to face a light source and receive light from the light source; and A second end is connected to the body and disposed at a far end relative to the first end; wherein light incident from the light source to the first end is emitted from the light guide device via the body and the second end and is incident on a corner of the light guide plate.

18. A display device, characterized in that, Include: The backlight module as described in any one of claims 1 to 16; and A display panel is located on the light-emitting side of the backlight module.

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