TW202043874A - Backlight module - Google Patents

Abstract

A backlight module includes a light source, a frame and a light guide module. The frame includes a light-emitting side frame with the light source, a first side frame, a second side frame and a third side frame. The first side frame is vertical to the light-emitting side frame. The second side frame is opposite to the first side frame. Both first side frame and second side frame have at least one L-shaped groove. The third side frame is opposite to the light-emitting side frame and has at least one positioning splinter. The light guide module is surrounded by the frame and has a light guide plate. The light guide plate has a plurality of positioning convex portions at its two edges. The positioning convex portions are respectively coupled to the L-shaped grooves. The positioning splinters keep the light guide plate adjacent to the light source by direct connecting.

Description

Backlight module

This disclosure relates to a backlight module.

With the advancement of technology, various display devices appear in every corner of people's lives. An important part of the display device is the backlight module, which is related to the brightness and darkness of the overall screen when the display device displays information on its screen.

Common display devices in daily life, such as touch mobile phones, are prone to fall to the ground or similar collision damage because people often carry them with them. At this time, the light source and the light guide plate in the backlight module will be misaligned to produce a gap. Once the gap is too large, the light guide plate will not be able to effectively guide the light emitted by the light source, thereby affecting the display function of the display device. The misalignment direction of these dislocations caused by collision and fall is often perpendicular to the light guide plate.

One technical aspect of this disclosure relates to a backlight module.

According to an embodiment of the present disclosure, a backlight module includes a light source, an outer frame, and a light guide module. The outer frame includes a light incident side frame, opposite first and second side frames, and a third side frame. The light source is arranged on the light incident side frame. The opposite first and second side frames are respectively perpendicular to the light incident side frame, and each have at least one L-shaped groove. The third side frame is opposite to the light incident side frame. The third side frame has at least one positioning elastic piece. The light guide module is arranged inside the outer frame and has a light guide plate. There are a plurality of positioning protrusions on both sides of the light guide plate. The positioning protrusions are respectively engaged with the L-shaped grooves. The positioning springs directly contact the light guide plate, so that the light guide plate is kept close to the light source, and the positioning protrusions are positioned in the L-shaped grooves.

In one or more embodiments of the present disclosure, the L-shaped groove of the backlight module as described above has an opening and a notch. The opening is recessed from the surface of the outer frame, and the notch extends in a direction parallel to the surface of the outer frame inside the opening. The light source extends. The positioning protrusions are respectively engaged with the notches of the L-shaped grooves to keep the light guide plate and the light source at the same level.

In one or more embodiments of the present disclosure, in the backlight module as described above, when the positioning protrusion is engaged with the L-shaped groove, the bottom part of the opening of the L-shaped groove is not covered by the positioning protrusion .

In one or more embodiments of the present disclosure, in the backlight module as described above, the L-shaped groove on the first side frame and the L-shaped groove on the second side frame are not aligned with each other.

In one or more embodiments of the present disclosure, the thickness of the light guide plate of the backlight module as described above is greater than the thickness of the positioning protrusion.

In one or more embodiments of the present disclosure, the positioning spring of the backlight module as described above is integrally formed with the outer frame.

In one or more embodiments of the present disclosure, the part of the positioning spring of the backlight module as described above is embedded in the outer frame.

In one or more embodiments of the present disclosure, the light source of the aforementioned backlight module is a light emitting diode light bar.

In one or more embodiments of the present disclosure, the backlight module as described above further includes conductive wires, wherein the conductive wires are located under the outer frame of the housing and connected to the light source and the light guide area of the light guide plate.

In one or more embodiments of the present disclosure, the above-mentioned backlight module further includes a reflective sheet, a diffusion sheet, a first brightness enhancement sheet and a second brightness enhancement sheet. The reflective sheet is located under the light guide plate. The diffuser is located above the light guide plate. The first brightness enhancement sheet is located above the diffusion sheet. The second brightness enhancement sheet is located above the first brightness enhancement sheet.

In the above-mentioned embodiments of the present disclosure, the backlight module of the present disclosure has a light source, an outer frame, and a light guide plate, and the light guide plate is fixed to the outer frame through an L-shaped groove, a positioning protrusion and a positioning elastic sheet. The positioning protrusions are respectively engaged with the L-shaped grooves. The L-shaped groove has a notch, and the positioning protrusion is engaged with the notch, so that the light guide plate can be kept aligned with the light source in the vertical direction. The positioning elastic piece uses elasticity to make the light source and the light guide plate closely adhere and maintain close proximity, and also enables the positioning protrusion and the L-shaped groove to be more closely engaged. In this way, the light guide plate will not easily be displaced due to collision, and the light guide plate will be kept aligned with the light source.

The following is a detailed description of the embodiments with the accompanying drawings, but the provided embodiments are not used to limit the scope of the disclosure, and the description of the structure operation is not used to limit the order of its execution, any recombination of components The structure and the devices produced with equal effects are all covered by this disclosure. In addition, the drawings are for illustrative purposes only, and are not drawn according to the original dimensions. To facilitate understanding, the same or similar elements in the following description will be described with the same symbols.

In addition, the terms (terms) used in the entire specification and the scope of the patent application, unless otherwise specified, usually have the usual meaning of each term used in this field, in the content disclosed here, and in the special content . Some terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance on the description of the present disclosure.

In the implementation mode and the scope of the patent application, unless the article is specifically limited in the context, "a" and "the" can generally refer to a single or plural. The numbers used in the steps are only used to mark the steps for ease of description, and are not used to limit the sequence and implementation.

FIG. 1 shows a top view of a backlight module 100 according to an embodiment of the disclosure. As shown in FIG. 1, the backlight module 100 includes a housing, a light source 110 and a light guide module 150. The housing includes an outer frame 140, and the light source 110 and the light guide module 150 are disposed inside the outer frame 140.

As shown in FIG. 1, in this embodiment, the outer frame 140 is a rectangular frame, but the disclosure is not limited to this. The outer frame 140 includes a light-incident side frame 147, a first side frame 141, a second side frame 143, and a third side frame 145. The light source 110 is a light emitting diode light bar, and is arranged on the light incident side frame 147. The first side frame 141 and the opposite second side frame 143 are respectively perpendicular to the light incident side frame 147, and the first side frame 141 and the second side frame 143 have an L-shaped groove 142 and an L-shaped groove 144, respectively. The third side frame 145 is opposite to the light incident side frame 147, and the third side frame 145 has at least one positioning spring 146.

The light guide module 150 is surrounded by the light incident side frame 147, the first side frame 141, the second side frame 143, and the third side frame 145. The light guide module 150 includes a light guide plate 160, and as shown in FIG. 1, one side of the light guide plate 160 is adjacent to the light source 110 and consists of a light incident side frame 147, a first side frame 141, a second side frame 143, and a second side frame 143. Surrounded by a three-sided frame 145, and the light guide plate 160 also has a plurality of positioning protrusions 163. These positioning protrusions 163 are located on both sides of the light guide plate 160 for engaging with the L-shaped groove 142 and the L-shaped groove 144. The light guide plate 160 is fixed to keep it aligned with the light source 110 in the z direction. Please refer to the direction indicated in Figure 1 for the z direction. In some embodiments, the light guide plate 160 and its positioning protrusion 163 are integrally formed.

Once the light guide plate 160 and the light source 110 are misaligned, the light from the light source 110 cannot be uniformly transmitted to the entire light guide plate 160, so that there will be a significant difference in brightness and darkness on the light guide plate 160. The misalignment problem of the backlight module 100 that is often mentioned nowadays often occurs on mobile display devices such as mobile phones, and a large part of these misalignment problems are caused by collision and fall. If it is caused by collision and fall, the misalignment of the light guide plate 160 and the light source 110 often occurs along the Z direction, that is, along the direction perpendicular to the surface of the main body 161 of the light guide plate 160. In the present disclosure, the L-shaped groove 142 and the L-shaped groove 144 are used to solve the problem of misalignment in the z direction, and the positioning spring 146 is used to keep the light guide plate 160 close to the light source 110 in the y direction. The detailed structure of the L-shaped groove 142 and the L-shaped groove 144, and the specific function of the positioning elastic piece 146, please refer to the following discussion.

Figure 2 shows a cross-sectional view of Figure 1 along the line A-A'. Figures 3 and 4 are cross-sectional views taken along the line B-B' in Figure 1. Figure 5 shows a cross-sectional view of Figure 1 along the line C-C'. In this embodiment, and in this embodiment, the light guide module 150 further includes a reflective sheet 170, a diffusion sheet 171, a first brightness enhancement sheet 172, and a second brightness enhancement sheet 173. In order to clearly illustrate the connection relationship between the light guide plate 160 and the outer frame 140, in Figures 2, 3 and 4, the reflective sheet 170, the diffuser 171, the first brightness enhancement sheet 172, and the second Enhancement sheet 173.

Referring to FIGS. 2 and 3 at the same time, the specific structure of the L-shaped groove 142 and how the positioning protrusion 163 of the light guide plate 160 is engaged with the L-shaped groove 142 is described. In Figure 2, the light guide plate 160 is disposed between the first side frame 141 and the second side frame 143, and in the y direction passed by the line segment A-A', there is only one L located on the first side frame 141.形槽142。 Shaped groove 142. The positioning protrusion 163 of the light guide plate 160 protrudes from one side of the light guide plate 160, and the protrusion direction of the positioning protrusion 163 is flat on the surface of the light guide plate 160 (that is, the x direction). As shown in FIG. 2, the L-shaped groove 142 is located in the first side frame 141, and the positioning protrusion 163 is embedded in the L-shaped groove 142, thereby ensuring the positioning of the light guide plate 160 in the z direction. If referring to FIGS. 2 and 3 at the same time, it can be confirmed that the positioning protrusion 163 is substantially engaged with the notch 142 b of the L-shaped groove 142.

The L-shaped groove 142 includes an opening 142a and a notch 142b. In Figure 3, the first side frame 141 has a top surface 141s, and the opening 142a is vertically recessed from the top surface 141s, and the notch 142b is located on a side wall 142as of the opening 142a, and runs in a direction parallel to the top surface 141s. The light source 110 extends. In this embodiment, the notch 142b extends in the direction of the light source 110 along the y direction. In this way, the opening 142a is substantially perpendicular to the recess 142b, and presents a shape like the English letter L. The advantage of using the L-shaped groove 142 for positioning lies in the positioning of the light guide plate 160 in the z direction.

In Figure 3, the positioning protrusion 163 of the light guide plate 160 is substantially engaged with the notch 142b of the L-shaped groove 142, and the notch 142b is located between the top surface 141s of the first side frame 141 and the opposite bottom surface 141b between. That is, the positioning protrusion 163 is engaged between the top surface 141s of the first side frame 141 and the opposite bottom surface 141b, which makes the light guide plate 160 substantially positioned on the top surface 141s of the first side frame 141 in the z direction And the opposite bottom surface 141b.

As shown in FIG. 3, in this embodiment, the positioning protrusion 163 of the light guide plate 160 has a protrusion width w parallel to the surface of the light guide plate 160 and a protrusion thickness d perpendicular to the surface of the light guide plate 160. The thickness d of the protrusion is smaller than the thickness of the light guide plate 160. The first side frame 141 of the outer frame 140 has a thickness t perpendicular to the top surface 141s. The opening 142a has an opening width d1 parallel to the extending direction of the first side frame 141, and an opening height h1 perpendicular to the top surface 141s. Wherein, the opening height h1 is less than the thickness t, so the opening 142a does not connect the top surface 141s of the first side frame 141 and the opposite bottom surface 141b. The notch 142b is located on a side wall 142as in the opening 142a, and has a notch depth d2 parallel to the extending direction of the first side frame 141 and a notch height h2 perpendicular to the top surface 141s. The height h2 of the notch is smaller than the height h1 of the opening, so that the notch 142b is finally located between the top surface 141s of the first side frame 141 and the opposite bottom surface 141b.

FIG. 4 shows a schematic cross-sectional view of the light guide plate 160 of FIG. 3 without being engaged, and the same reference numbers will not be repeated. Referring to FIGS. 3 and 4 at the same time, the specific process of the light guide plate 160 being engaged with the outer frame 140 will be described. The opening 142a serves as a channel, so that the positioning protrusion 163 of the light guide plate 160 enters from the top surface 141s of the first side frame 141 and can approach the recess 142b. Therefore, the opening width d1 of the opening 142a is greater than or equal to the protrusion width w of the positioning protrusion 163, so that the positioning protrusion 163 can enter the L-shaped groove 142. As shown in FIG. 4, in this embodiment, the opening width d1 of the opening 142a is larger than the protrusion width w of the positioning protrusion 163, so the positioning protrusion 163 can smoothly enter the L-shaped groove 142. Subsequently, the positioning protrusion 163 is moved in the y direction to be engaged with the recess 142b, as shown in FIG. 3. As a result, the bottom of the opening 142a will be partially exposed, which means that the positioning protrusion 163 enters through the opening 142a and engages with the recess 142b.

FIG. 3 shows that the positioning protrusion 163 is engaged with the recess 142 b of the L-shaped groove 142. To enable the positioning protrusion 163 to be accommodated in the recess 142b and to ensure that the positioning protrusion 163 does not move in the z direction, the height h2 of the recess is designed to be approximately equal to the thickness d of the protrusion. If so, when the positioning protrusion 163 is engaged with the recess 142b, the positioning protrusion 163 cannot be misaligned in the z direction, which also makes the light guide plate 160 must be maintained at the same height. Once the light guide plate 160 is aligned with the light source 110, after the positioning protrusion 163 of the light guide plate 160 is engaged with the notch 142b of the L-shaped groove 142, the light guide plate 160 will no longer be misaligned in the z direction. In some embodiments, the range of a thickness t of the first side frame 141 is between 0.5 mm and 0.7 mm, the range of the notch height h2 is one third of the thickness t, and the range of the notch depth d2 It is between one-third and one-half of the opening width d1. In this embodiment, the thickness d of the positioning protrusion 163 is substantially equal to the height h2 of the recess.

Similarly, the second side frame 143 has an L-shaped groove 144, and the L-shaped groove 144 and the L-shaped groove 142 have similar structures and functions, which will not be repeated here. In this embodiment, the extending direction of the notch of the L-shaped groove 144 is substantially the same as the extending direction of the notch 142b of the L-shaped groove 142. In some embodiments, the extending direction of the notch of the L-shaped groove 144 and the notch 142b of the L-shaped groove 142 should be at least mirror-symmetrical along the y-axis. There are a plurality of positioning protrusions 163 on both sides of the light guide plate 160, and the positioning protrusions 163 are respectively engaged with the L-shaped groove 142 and the L-shaped groove 144.

As shown in FIG. 1, in this embodiment, the L-shaped groove 142 and the L-shaped groove 144 are not aligned in the y direction, and are also misaligned with each other. This makes it possible to have an L-shaped groove 142 or an L-shaped groove 144 at different positions in the y direction to restrict the movement of the light guide plate 160 in the Z direction. In some embodiments, the L-shaped groove 142 and the L-shaped groove 144 may also be aligned in the y direction. However, in some embodiments, the L-shaped groove 142 and the L-shaped groove 144 may not be at the same height in the z direction. Through the L-shaped groove 142 and the L-shaped groove 144, the displacement of the light guide plate 160 in the z direction is restricted.

Returning to FIG. 1, the third side frame 145 also has a positioning spring 146 that restricts the displacement of the light guide plate 160 in the y direction. The positioning elastic piece 146 is elastic and provides a y-direction thrust of the light guide plate 160, so that the positioning protrusion 163 is positioned in the L-shaped grooves 142 and the L-shaped grooves 144. However, when the positioning protrusion 163 of the light guide plate 160 is loosened from the L-shaped groove 142 or the L-shaped groove 144, the light guide plate 160 is no longer adjacent to the light source 110 (that is, it is misaligned in the y direction). The positioning spring 146 on one side of the light guide plate 160 is contacted, and the light guide plate 160 is pushed back to abut the light source 110. At the same time, the positioning protrusion 163 loosened from the L-shaped groove 142 or the L-shaped groove 144 can also be elastically pushed back in the y-direction by the positioning elastic piece 146 to re-engage in the L-shaped groove 142 or L-shaped groove 144.

Figure 5 shows a cross-sectional view of the backlight module 100 in Figure 1 along the line C-C', and further shows the detailed structure of the light guide module 150 in the backlight module 100, and how the positioning spring 146 contacts the guide Light board 160. In FIG. 5, the light guide plate 160 adjacent to the light incident side 160L of the light source 110 is substantially a trapezoidal block, and the trapezoidal block is adjacent to and completely aligned with the light source 110. In this way, after the light incident side 160L of the light guide plate 160 is aligned with the light source 110, the light energy emitted by the light source 110 is guided by the light guide plate 160, and light is uniformly emitted from the surface of the light guide plate 160. A conductive wire 165 is also provided under the light incident side 160L of the light source 110 and the light guide plate 160, and the conductive wire 165 is connected to the light source 110 to emit light. In some embodiments, the conductive wire 165 is a flexible circuit board.

As shown in FIG. 5, the light guide module 150 further includes a reflection sheet 170, a diffusion sheet 171, a first brightness enhancement sheet 172 and a second brightness enhancement sheet 173. The reflective sheet 170 is located under the light guide plate 160. The purpose of providing the reflective sheet 170 is to prevent the light transmitted from under the light guide plate 160 from being wasted. The reflective sheet 170 can reflect the light transmitted from the bottom of the light guide plate 160, and the reflected light passes through the light guide plate 160 to guide the light out. The diffusion sheet 171 is located above the light guide plate 160 so that the light from the light guide plate 160 can be uniformly diffused on one surface. The first brightness enhancement sheet 172 is located above the diffusion sheet 171, and the second brightness enhancement sheet 173 is located above the first brightness enhancement sheet 172 to improve the light output of the backlight module 100.

The purpose of the positioning spring 146 is to ensure that the light guide plate 160 can be kept close to the light source 110. The reflection sheet 170, the diffusion sheet 171, the first brightness enhancement sheet 172 and the second brightness enhancement sheet 173 of the light guide module 150 are substantially attached to the light guide plate 160. Therefore, as shown in Figure 5, in some embodiments, the positioning elastic sheet 146 may not be in contact with the reflective sheet 170, the diffusion sheet 171, the first brightness enhancement sheet 172, and the second brightness enhancement sheet 173, but only the light guide plate 160. When the light guide plate 160 is misaligned in the y direction and the z direction, it can be corrected by the positioning elastic piece 146.

FIG. 6 shows a top view of a backlight module 100' according to another embodiment of the present disclosure. Referring to FIGS. 1 and 6 at the same time, the backlight module 100' is different from the backlight module 100 in that the arc positioning spring 146' of the backlight module 100' is not integrally formed with the third side frame 145. In some embodiments, the positioning elastic piece 146' is an independent metal piece or plastic. When the outer frame 140 is formed, the positioning elastic piece 146' is embedded in the third side frame 145 of the outer frame 140. In this embodiment, the positioning elastic piece 146' is an elastic piece with two ends, and both ends are embedded in the third side frame 145 to avoid falling off.

In summary, the backlight module of the present disclosure has a light source, an outer frame and a light guide module, and the light guide module includes a light guide plate. The light source is arranged on one side of the outer frame, and two edges perpendicular to the light source are respectively provided with a plurality of L-shaped grooves, the light guide plate has a positioning protrusion, and the positioning protrusion is coupled to the L-shaped groove. The L-shaped groove has a notch located between the outer surface and the bottom surface, and the positioning protrusion is substantially engaged with the notch, thereby ensuring that the light guide plate is not misaligned with the light source in the z direction. The positioning elastic piece is located on the side opposite to the light source. The positioning elastic piece has elasticity and remains in contact with the light guide plate, so that the light guide plate can be kept close to the light source in the y direction, and the positioning protrusion can be engaged with the notch of the L-shaped groove . In this way, the light guide plate will not easily be dislocated due to collision, and will remain aligned with the light source.

The features of several embodiments are described above so that those skilled in the art can better understand the description in various aspects. Those skilled in the art should understand that they can easily use this description as a basis to design or modify other processes and structures to achieve the same purposes or advantages as the embodiments introduced herein. Those skilled in the art should also understand that such an equivalent structure does not depart from the common spirit and scope of this description, and various changes, substitutions or alterations can be made without departing from the spirit and scope of this description.

100, 100’: Backlight module 110: light source 140: outer frame 141: first side frame 141s: top surface 141b: bottom surface 142: L-shaped groove 142a: opening 142as: sidewall 142b: Notch 143: second side frame 144: L-shaped groove 145: third side frame 146, 146’: positioning shrapnel 147: Light side frame 150: light guide module 160: light guide plate 160L: light side 163: positioning protrusion 165: conductive thread 170: reflective sheet 171: diffuser 172: First Brightening Film 173: Second Brightening Film A-A’: Line segment B-B’: Line segment C-C’: Line segment d: Thickness of convex parts w: width of protrusion d1: opening width d2: notch depth h1: opening height h2: notch height t: thickness

The advantages and drawings of the present disclosure should be understood by the following embodiments and with reference to the accompanying drawings. The descriptions of these drawings are only examples of implementations, and therefore should not be considered as limiting individual implementations or limiting the scope of patent applications for inventions. Figure 1 shows a top view of a backlight module according to an embodiment of the present disclosure; Figure 2 shows a cross-sectional view along the line A-A' in Figure 1; Figure 3 shows a cross-sectional view along the line B-B' in Figure 1; Figure 4 shows a schematic cross-sectional view of the light guide plate of Figure 3 that is not yet engaged; Figure 5 shows a cross-sectional view along the line C-C' in Figure 1; and FIG. 6 is a top view of a backlight module according to another embodiment of the disclosure.

100: Backlight module

110: light source

140: outer frame

141: first side frame

142: L-shaped groove

143: second side frame

144: L-shaped groove

145: third side frame

146: positioning shrapnel

147: Light side frame

150: light guide module

160: light guide plate

163: positioning protrusion

A-A’: Line segment

B-B’: Line segment

C-C’: Line segment

Claims (10)

A backlight module, including: A light source; A frame that contains: A light incident side frame, wherein the light source is disposed on the light incident side frame; A first side frame and a second side frame are perpendicular to the light incident side frame, respectively, wherein the first side frame and the second side frame each have at least one L-shaped groove; and A third side frame opposite to the light-incident side frame, wherein the third side frame has at least one positioning elastic piece; and A light guide module is arranged on the inner side of the outer frame and has a light guide plate, wherein there are a plurality of positioning protrusions on both sides of the light guide plate, and the positioning protrusions are respectively engaged with the L-shaped grooves, and the at least A positioning elastic sheet directly contacts the light guide plate for keeping the light guide plate close to the light source and positioning the positioning protrusions in the L-shaped grooves. The backlight module of claim 1, wherein each of the L-shaped grooves has an opening and a notch, the opening is vertically recessed from a surface of the outer frame, and the notch is formed along a side wall of the opening Extending toward the light source in a direction parallel to the surface, the positioning protrusions are engaged with the notch to keep the light guide plate and the light source at the same level. The backlight module according to claim 2, wherein the positioning protrusions are engaged with the L-shaped grooves, and the bottom portions of the openings of the L-shaped grooves are not covered by the positioning protrusions. The backlight module according to claim 2, wherein the at least one L-shaped groove on the first side frame and the at least one L-shaped groove on the second side frame are not aligned with each other. The backlight module according to claim 2, wherein the thickness of the light guide plate is greater than the thickness of one of the positioning protrusions. The backlight module according to claim 1, wherein the positioning spring sheets are integrally formed with the outer frame. The backlight module according to claim 1, wherein parts of the positioning elastic pieces are embedded in the outer frame. The backlight module according to claim 1, wherein the light source is a light emitting diode light bar. The backlight module according to claim 1, further comprising a conductive wire, wherein the conductive wire is located under the outer frame, and the conductive wire is connected to the light source and the light guide plate. The backlight module according to claim 1, wherein the light guide module further comprises: A reflective sheet located under the light guide plate; A diffuser, located above the light guide plate; A first brightness enhancement sheet located above the diffusion sheet; and A second brightness enhancement sheet is located above the first brightness enhancement sheet.

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