TW201610523A - Backlight module - Google Patents

Abstract

A backlight module includes a light guide plate and a light source module. The light guide plate includes a light incident surface. The light incident surface has a lengthwise direction. The light source module is disposed adjacently to the light incident surface. The light source module includes a reflective frame, an optical film and at least one light source. The reflective frame has a carrier plate and a reflective cover. The carrier plate and the reflective cover surround a space that has an opening. The opening faces toward the light incident surface. The optical film is disposed on the carrier plate and covers the opening. The optical film has a plurality of light-outgoing structures. The light amount that passes through the light-outgoing structures varies along the lengthwise direction. The light source is disposed on the carrier plate. The light source emits a light. The light is reflected by the reflective cover to the optical film, and a portion of the light passes through the light-outgoing structure.

Description

Backlight module

The invention relates to a backlight module, and in particular to a backlight module of a display device.

The liquid crystal display device includes a liquid crystal panel and a backlight module. The liquid crystal panel is disposed on the backlight module, and the backlight module can provide light to the liquid crystal panel, so that the user can view the screen displayed by the liquid crystal panel.

A general backlight module can be divided into a direct type backlight module and a side-in type backlight module. The direct-lit backlight module places the light source directly under the liquid crystal panel, so that the light source can directly emit light toward the liquid crystal panel. The side-in backlight module is provided with a light guide plate under the liquid crystal panel, and the light source is disposed on the side of the light guide plate. In use, the light source can emit light into the side of the light guide plate, and after the light travels in the light guide plate, the light can be emitted from the top surface of the light guide plate to the liquid crystal panel. Since the light source of the side-lit backlight module is not located directly below the liquid crystal panel, and there is no need for a vertical light mixing space, the thickness of the liquid crystal display device can be reduced, which is advantageous for the thin design of the liquid crystal display device, and is mainstream.

In addition to the thin design, the current liquid crystal display devices are gradually moving toward the design trend of narrow frames. In the design trend of the narrow bezel, the non-visible area of the liquid crystal display device is designed to be narrower and narrower, due to the side-in type back The light source of the optical module is located in the non-visible area, so the distance from the light source to the visible area will be forced to shrink. When the distance from the light source to the visible area is reduced, due to insufficient mixing distance, the light output of the backlight module will exhibit uneven brightness and darkness (also known as hot spot phenomenon). In addition, in order to save the cost of the liquid crystal display device, the manufacturer often wants to reduce the number of light sources. However, if the number of light sources is reduced, the spacing between adjacent two light sources is bound to increase, and the increase in the pitch also causes the above-mentioned hot spot. phenomenon.

In view of the above, an object of the present invention is to reduce the phenomenon of uneven brightness of the backlight module.

In order to achieve the above object, a backlight module includes a light guide plate and a light source module according to an embodiment of the invention. The light guide plate has a light incident surface. The light mask has a length direction. The light source module is disposed beside the light incident surface. The light source module comprises a reflective frame, an optical control film and at least one light source. The reflective frame has a carrier plate and a reflector. The carrier plate and the reflector cover a space, and the space has an opening. This opening faces the light entrance surface. The optically controlled film is disposed on the carrier sheet and covers the opening. The optical control film has a plurality of light-emitting structures. The light penetration amount of the light-emitting structure changes along the longitudinal direction starting from the projection position of the closest light source on the optical control film. The light source is disposed on the carrier plate, and the light source emits a light. Light is incident on the reflector and reflected to the optical control film, and part of the light passes through the light exit structure.

In the above embodiment, since the light source is housed in the space surrounded by the reflector and the carrier, part of the light emitted by the light source is reflected. The cover is reflected to the optical control film and is passed through the light-emitting structure of the optical control film to enter the light guide plate. Therefore, the light can enter the light guide plate after at least one reflection process, so that the path length of the light traveling from the light source to the light guide plate can be increased, thereby facilitating the light mixing, and the light is distributed by the plurality of light-emitting structures, thereby reducing the brightness. Dark uneven phenomenon.

According to another embodiment of the present invention, a backlight module includes a light guide plate and a light source module. The light guide plate has a light incident surface. The light mask has a length direction. The light source module is disposed beside the light incident surface, and the light source module includes a reflective frame and at least one light source. The reflective frame has a carrier plate and a reflector. The carrier plate and the reflector cover a space. The reflector has an optical control zone. The optical control region faces the light incident surface and the range of the optical control region corresponds to the light incident surface. The optical control zone has a plurality of light-emitting structures. The light penetration amount of the light-emitting structure changes along the length direction starting from the projection position of the closest light source on the optical regulation region. The light source is disposed on the carrier board. The light source emits a light. Light is incident on the reflector and reflected to the optical conditioning zone, and a portion of the light passes through at least one of the light exiting structures.

In the above embodiment, since the light source is housed in the space surrounded by the reflector and the carrier, part of the light emitted by the light source is reflected by the reflector to the optical control region, and is worn by the light-emitting structure of the optical control region. Exit and enter the light guide. Therefore, the light can enter the light guide plate after at least one reflection process, so that the path length of the light traveling from the light source to the light guide plate can be increased, thereby facilitating the light mixing, and the light is distributed by the plurality of light-emitting structures, thereby reducing the brightness. Dark uneven phenomenon.

The above description is only used to explain the problems and solutions to be solved by the present invention. The specific details of the present invention, the effects thereof, and the like, will be described in detail in the following embodiments and related drawings.

1, 2, 3, 4, 5, 9, 7, 8, 9, 10, 11‧‧‧ backlight modules

100‧‧‧Light source module

110, 110a, 110b, 110c, 110d‧‧‧ reflection frame

111‧‧‧ recess

112‧‧‧Loading board

114, 114b, 114c, 114d‧‧‧ reflector

1142‧‧‧ side panels

1144‧‧‧ top board

1146‧‧‧Optical control area

120, 120a‧‧‧ light source

130, 130a, 130b‧‧‧ optical control film

131‧‧‧First area

132, 132a, 132b‧‧‧ light structure

133‧‧‧Second area

134, 134a, 134b‧‧‧reflection area

135‧‧‧ recess

200, 200a‧‧‧ light guide plate

210‧‧‧Into the glossy surface

220‧‧‧Glossy

300‧‧‧ diaphragm

400‧‧‧ circuit board

500, 500a‧‧‧ back frame

501‧‧‧floor

502‧‧‧ accommodating slots

600, 600a‧‧‧ plastic frame

700‧‧‧Heat-conducting parts

710‧‧‧ convex

CX1, CY1, CX2, CY2, CX3, CY3‧‧‧ curves

D‧‧‧ equivalent diameter

F‧‧‧Scope of illumination

I‧‧‧virtual location

L‧‧‧Light

O, O’‧‧‧ openings

R‧‧‧Scope of illumination

S, S’‧‧‧ space

T‧‧‧thickness

X‧‧‧ length direction

Y‧‧‧ height direction

θ‧‧‧Maximum opening angle

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. 2 is a perspective view of the light source module and the light guide plate according to FIG. 1; FIG. 3 is an equivalent optical path diagram of the backlight module of FIG. 1; FIG. 4 to FIG. FIG. 7 is a cross-sectional view of a backlight module according to a second embodiment of the present invention; and FIG. 8 is a cross-sectional view of a backlight module according to a third embodiment of the present invention; FIG. 10 is a cross-sectional view of a backlight module according to a fourth embodiment of the present invention; FIG. 11 is a cross-sectional view of a backlight module according to a fifth embodiment of the present invention; and FIG. 11 is a sixth embodiment of the present invention. FIG. 12 is a cross-sectional view of a backlight module according to a seventh embodiment of the present invention; and FIG. 13 is a cross-sectional view of the backlight module according to the eighth embodiment of the present invention; FIG. 14 is a cross-sectional view of a backlight module according to a ninth embodiment of the present invention; FIG. 15 is a perspective view of a light source module and a light guide plate according to FIG. 14; A cross-sectional view of a backlight module of a tenth embodiment; and a cross-sectional view of a backlight module according to an eleventh embodiment of the present invention.

The embodiments of the present invention are disclosed in the following drawings, and for the purpose of clarity However, it should be understood by those skilled in the art that the details of the invention are not essential to the details of the invention. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

1 is a partial cross-sectional view of a backlight module 1 according to a first embodiment of the present invention. As shown in FIG. 1 , in the present embodiment, the backlight module 1 can include the light source module 100 and the light guide plate 200 . The light source module 100 includes a reflective frame 110, a light source 120, and an optical control film 130. Further, the reflective frame 110 has a carrier plate 112 and a reflector cover 114. The carrier plate 112 and the reflector cover 114 are surrounded by a space S, and the space S has an opening O. Carrier board 112 The light source 120 is used to carry the light source 120, and the light from the light source 120 is reflected and mixed; the reflectance of the carrier 112 and the reflector 114 may be the same or different, and the reflectance is preferably between 50% and 100%. In a preferred embodiment of the invention, the reflector 114 is a high reflectivity material or is provided with a highly reflective material on the inner surface. The carrier plate 112 and the reflector cover 114 are preferably made of a metal material, such as an aluminum plate. However, in different embodiments, the carrier plate 112 and the reflector cover 114 may be made of a plastic material or a metal material mixed with a plastic material.

The light source module 100 is disposed adjacent to the light incident surface 210 of the light guide plate 200, and the opening O is directed toward the light incident surface 210. Specifically, referring to FIG. 2 , the figure shows a perspective view of the light source module 100 and the light guide plate 200 according to FIG. 1 . As shown in FIG. 2 , the optical control film 130 is disposed on the carrier plate 112 and covers the opening O. The optical control film 130 includes a reflective surface 134 and a plurality of light emitting structures 132. The light L generated by the light source 120 can be reflected by the reflective surface 134 and the reflective frame 110. The space S is reflected back and forth, and the optical control film 130 is passed through the light-emitting structure 132. The light-emitting structure 132 may be a through hole or a structure such as a non-through hole such as an indentation. In a preferred embodiment, the reflective surface 134 is formed on one side of the optical control film 130 toward the light source 120; the plurality of light-emitting structures 132 respectively penetrate the optical control film 130. In the embodiment shown in FIG. 2, the optical control film 130 includes a first region 131 and a second region 133, the light-emitting structure 132 is disposed on the first region 131, and the first region 131 corresponds to the light-emitting surface 210; The region 133 does not have the light exiting structure 132 and does not correspond to the light incident surface 210. The arrangement of the first region 131 and the second region 133 can be adjusted according to the area of the light incident surface 210 of the light guide plate 200. Therefore, by adjusting the light junction Light rays L from the light source 120 can be distributed in the number and size of the different positions of the structure 132 on the first area 131. In some embodiments, the optical control film 130 is integrally formed with the reflective cover 114.

The light incident surface 210 of the light guide plate 200 has a longitudinal direction X and a height direction Y perpendicular to the longitudinal direction X. In detail, the longitudinal direction X is the direction parallel to the light exit surface 220, and the height direction Y is the direction parallel to the light incident surface 210. The plurality of light sources 120 are arranged at intervals along the length direction X. As described above, the light-emitting structures 132 may have different numbers and/or sizes at different positions on the first region 131, and the light-emitting structures 132 are distributed along the length direction X of the light-incident surface 210 of the light guide plate 200, wherein the light-emitting structure The amount of light penetration of 132 may vary depending on the distance from the source 120.

In a preferred embodiment of the invention, the amount of light penetration is based on the projected position of the light source 120 closest to the light source 120 on the optical control film 130, and varies along the length direction X according to a predetermined function value of the first function. In other words, the function value (light penetration amount) of the first function will gradually increase as the distance from the projection position of the light source 120 on the optical modulation film 130 increases. Moreover, the first function may vary with the shape of the light source 120 or its symmetrical directionality. The first function is preferably a polynomial function, such as a quadratic or more polynomial function, but is not limited thereto. In an embodiment of the invention, the first function is a polynomial function as follows: Tr = k ₁ p ⁿ + k ₂ p ^n-1 + k ₃ p ^n-2 +.... + k _n p + m Wherein k ₁ ~k _n and m are respectively coefficients adjusted according to optical requirements, and p is the distance between the light-emitting structure 132 and the projection position of the light source 120 closest to the optical structure 132 on the optical control film 130, where Tr is the position The amount of light penetration. Taking a 50 吋 panel backlight module as an example, the first function is a polynomial function as shown below: Tr=Ap ² +Bp ¹ +CA=-0.0003 B=0.0232 C=0

Then, the light L emitted from the light source 120 is distributed through the optical control film 130 to improve the uniformity of the light output of the backlight module and solve the unevenness of light and darkness caused by the light source 120. In some other embodiments, the distribution of the light-emitting structure 132 in the first region 131 can be adjusted according to requirements. The light-emitting structure 132 can also be distributed along the length direction X and the height direction Y of the light-incident surface 210 of the light guide plate 200, and the light is emitted. The light penetration of the structure 132 is based on the projected position of the light source 120 closest to the light source 120 on the optical control film 130, and varies according to a function value of the preset first function.

Since the light L emitted by the light source 120 is reflected by the reflector 114 and then passes through the light-emitting structure 132 of the optical control film 130, part of the light L emitted from the light source 120 can pass through at least one reflection process before entering the guide. In the light panel 200. Therefore, even in the design of the narrow bezel, the distance between the light source 120 and the light guide plate 200 is shortened, but since the path length of the light L emitted from the light source 120 to the light guide plate 200 can be elongated, the light can be mixed and lowered. Low light and dark unevenness.

The light-emitting structure 132 is in the form of a circular perforation, but the shape of the perforation is not limited to the above-mentioned circular shape. In other embodiments, it may be an elliptical shape, a triangular shape, or other types of quadrangles, or even the shape of each light-emitting structure 132. Not the same. The area of each of the perforations has the same area as a circle, that is, has an equivalent diameter d equivalent to the circle. As shown in FIG. 2, the equivalent diameter d of the light-emitting structure 132 is proportional to the distance from the light-emitting structure 132 to the projected position of the closest light source 120 on the optical control film 130. In other words, the light exiting structure 132 that is further away from the light source 120 has a larger equivalent diameter d and a higher amount of light penetration. Therefore, when the light source 120 emits light, even if the light emitted by the light source 120 is degraded during the traveling, the light-emitting structure 132 that is farther away from the light source 120 allows more light to pass, and the light-emitting structure 132 that is closer to the light source 120. Allowing less light to pass, the brightness of the light source module 100 along the length direction X can be relatively uniform, and the phenomenon of uneven brightness and darkness is reduced. In addition, since the phenomenon of uneven brightness and darkness can be reduced in the above manner, the spacing between adjacent two light sources 120 can be increased, that is, the number of light sources 120 can be reduced, thereby saving cost.

FIG. 3 is a diagram showing an equivalent optical path of the backlight module of FIG. 1. As shown in FIG. 3, in some embodiments, the light source 120 can be a light emitting diode. The illuminating field shape of the illuminating diode is a field shape with an opening angle of about 120 degrees. Since the field shape still has a lot of stray light outside the opening angle of 120 degrees, many stray light emitted by the light source 120 cannot enter the light guiding plate 200. The result is a decrease in the coupling efficiency. Therefore, the light emitted by the light source 120 can be distributed by the arrangement of the optical control film 130 and the light exiting structure 132 to improve the coupling efficiency. in In a preferred embodiment of the invention, the thickness of the optical conditioning film 130 is less than 1 mm. Further, the relationship between the thickness t of the optical control film 130 and the equivalent diameter d of the light-emitting structure 132 is preferably based on the relationship d/t<3.4. When the relationship is satisfied, even if the light source 120 is very close to the light-emitting structure 132, even at the virtual position I on the light-emitting structure 132, the maximum opening angle θ of the light shape that the light source 120 can emit toward the light guide plate 200 is due to the above equivalent. The diameter d and the thickness t are limited, and less than 120 degrees, so that the coupling efficiency can be improved.

For example, the analog light pattern of the comparative example shown in FIG. 4 to FIG. 6 can be referred to, wherein FIG. 4 is a conventional light source module without the light pattern simulated by the optical control film 130, wherein The curve CX1 represents a light shape distributed along the length direction X (see Fig. 2), and the curve CY1 represents a light shape distributed along the height direction Y (see Fig. 2). 5 is a light pattern diagram of the light source module 100 of FIG. 2, and when the ratio of the equivalent diameter d of the light-emitting structure 132 to the thickness t of the optical control film 130 is 4.9, the simulated light pattern, wherein the curves CX2 and CY2 They respectively represent the light patterns distributed along the length direction X and the height direction Y. 6 is a light pattern diagram of the light source module 100 of FIG. 2, and the ratio of the equivalent diameter d of the light-emitting structure 132 to the thickness t of the optical control film 130 is 1.3, the simulated light pattern, wherein the curves CX3 and CY3 They respectively represent the light patterns distributed along the length direction X and the height direction Y.

As shown in FIGS. 4 and 5, the area covered by the curve CX2 is narrower than the area covered by the curve CX1, that is, the light shape represented by the curve CX2 is more concentrated than the light shape represented by the curve CX1. Therefore, the arrangement of the optical control film 130 can make the light shape of the light source module 100 in the longitudinal direction X more concentrated. Similarly, the area covered by the curve CY2 is narrower than the area covered by the curve CY1, that is, the light shape represented by the curve CY2 is more concentrated than the light shape represented by the curve CY1. Therefore, the optical control film 130 can make the light shape of the light source module 100 in the height direction Y more concentrated.

As shown in FIGS. 5 and 6, the area covered by the curve CX3 is narrower than the area covered by the curve CX2, that is, the light shape represented by the curve CX3 is more concentrated than the light shape represented by the curve CX2. Therefore, the light source module 100 is more concentrated in the optical modulation film 130 having a d/t value of less than 3.4 compared to a light shape having a d/t value greater than 3.4 in the longitudinal direction X. Similarly, the area covered by the curve CY3 is narrower than the area covered by the curve CY2, that is, the light shape represented by the curve CY3 is more concentrated than the light shape represented by the curve CY2. Therefore, the light source module 100 is more concentrated in the optical modulation film 130 having a d/t value of less than 3.4 compared to a light shape having a d/t value greater than 3.4 in the height direction Y.

It can be seen from FIGS. 4 to 6 that the optical modulation film 130 can not only concentrate the light shape of the light source module 100, but when the value of d/t is less than 3.4, the light shape of the light source module 100 converges better. Therefore, when the equivalent diameter d and the thickness t substantially satisfy: d/t < 3.4, the light shape can be effectively concentrated. In addition, as can be seen from the simulation results of FIG. 4, when the conventional light source module without the optical control film 130 is used, if the light source 120 emits 1 watt of light, the light guide plate 200 can receive 0.4856 watts of light, and its coupling efficiency is 48.56%; when the light source module 100 of the optical control film 130 having a d/t value of 4.9 is used, if the light source 120 emits 1 watt of light, the light guide plate 200 can receive 0.4655 watts of light, and its coupling efficiency is 46.55. When the light source module 100 having a d/t value of 1.3 is used, if the light source 120 emits 1 watt of light, the light guide plate 200 can receive 0.5195. The light of the tile has a coupling efficiency of 51.95%. It can be seen that when the equivalent diameter d and the thickness t substantially satisfy: d/t<3.4, not only can the light shape be converged, but the coupling efficiency can be effectively improved.

Referring to FIG. 1, the reflective frame 110 has a U-shaped cross-sectional shape to surround the space S. As shown in FIG. 1, the reflector 114 may include a side panel 1142 and a top panel 1144. The side panel 1142 is coupled between the top panel 1144 and the carrier panel 112. The top panel 1144 is substantially parallel to the carrier panel 112, and both are substantially perpendicular to the side panel. 1142, which together form a cross-sectional shape of a U-shape. However, the cross-sectional shape of the reflective frame 110 may be other shapes. In the backlight module 2 of the second embodiment of the present invention and the backlight module 3 of the third embodiment, as shown in FIGS. 7 and 8 respectively, the reflection is performed. The reflectors 114a/114b included in the frame 110a/110b are at an angle to the carrier plate 112. The difference between the two is that the reflection cover 114a of the embodiment of FIG. 7 is a curved plate body, and the cross section of the reflection frame 110a is fan-shaped; the reflection cover 114b of the embodiment of FIG. 8 is a sloped inclined surface, so that the reflection frame is The profile of 110b is triangular. The light mixing effect of the light in the space S is improved by adjusting the angle θ between the reflective cover 114a/114b and the carrier plate 112. The angle θ is preferably less than 90 degrees.

FIG. 9 is a cross-sectional view showing a backlight module 4 according to a fourth embodiment of the present invention. The difference between the present embodiment and the first embodiment (as shown in FIG. 1 ) is that the heat conductive member 700 of the backlight module 1 of the first embodiment is disposed on the back frame 500 and only carries the light guide plate 200 . The light source module 100 is not carried. The heat conducting member 700 of the backlight module 4 of the present embodiment has a convex portion 710 on which the light guiding plate 200 is disposed, and the convex portion 710 is opposite to the light guiding portion. A light source module 100 is disposed on a portion of the heat conducting member 700 on one side of the board 200. In a preferred embodiment of the present invention, the circuit board 400 of the light source 120 is preferably disposed on the outer side of the carrier board 112. In this way, the thermal energy generated when the light source 120 emits light can be directly transmitted to the heat conductive member 700 through the circuit board 400, and then transmitted to the back frame 500 by the heat conductive member 700 to quickly dissipate heat into the environment. In some embodiments, the material of the heat conductive member 700 may be a metal with good heat conductivity such as copper, aluminum, etc., but the invention is not limited thereto.

FIG. 10 is a cross-sectional view showing a backlight module 5 according to a fifth embodiment of the present invention. As shown in Fig. 10, the main difference between the present embodiment and the foregoing embodiment is the difference in the back frame 500a. Further, as shown in FIG. 10, the back frame 500a has a bottom plate 501 and a receiving groove 502. The bottom plate 501 is connected to the receiving groove 502. The bottom plate 501 is used to carry the light guide plate 200. The accommodating slot 502 accommodates the light source module 100, and the level of the bottom of the accommodating slot 502 is lower than the level of the bottom plate 501. More specifically, the carrier 112 of the reflective frame 110 of the light source module 100 is disposed at the bottom of the receiving slot 502, and since the level of the bottom of the receiving slot 502 is lower than the level of the bottom plate 501, the light guide 200 The level of the position is higher than the level of the light source 120, so that the space S surrounded by the carrying plate 112 and the reflector 114 is enlarged to increase the light mixing space, and the phenomenon of uneven light and darkness is reduced.

11 is a cross-sectional view showing a backlight module 6 according to a sixth embodiment of the present invention. The main difference between the present embodiment and the fifth embodiment shown in FIG. 10 is that the light guide plate 200a is partially carried on the bottom plate 501 and partially exposed to the notch of the receiving groove 502, and the light guide plate 200a is exposed. The vertical projection of the portion of the slot of the slot 502 on the bottom of the receiving slot 502 overlaps at least a portion of the light source module 100. In this way, the optical control film 130 is recessed into a concave portion 135, and the optical control film 130 has an L-shaped cross section to accommodate the portion of the light guide plate 200a exposed to the notch of the receiving groove 502, so as to achieve the design of the narrow frame at the same time. Have enough light mixing space.

FIG. 12 is a cross-sectional view showing a backlight module 7 according to a seventh embodiment of the present invention. The main difference between the embodiment and the foregoing embodiment is that the frame 600a is used as the reflection frame of the light source module 100. Further, the plastic frame 600a is surrounded by the space S'. This space S' has an opening O'. The light source 120 is housed in a space S' surrounded by the frame 600a, and the optical control film 130 covers the opening O'. The light emitted by the light source 120 can be reflected by the wall surface of the space S' surrounded by the frame 600a, and passes out of the space S' from the light-emitting structure 132 of the optical control film 130. Since the plastic frame 600a is directly used as the reflection frame in the embodiment, the cost required for additionally manufacturing the reflection frame can be eliminated and the size of the backlight module can be reduced.

Figure 13 is a cross-sectional view showing a backlight module 8 in accordance with an eighth embodiment of the present invention. The main difference between the present embodiment and the foregoing embodiment is the difference in the position at which the light source 120a is disposed. Further, the carrying board 112 of the reflective frame 110 includes an extending portion 1122 that is parallel to the light incident surface 210 of the light guide plate 200, and the light source 120a is disposed on the surface of the extending portion 1122. Specifically, the carrier plate 112 is formed in an L shape and is surrounded by the reflection cover 114 to form a space S having an opening O. The optical control film 130 covers the opening O. When the light source 120a is disposed on the surface of the extending portion 1122 facing the opening O, the light extraction efficiency can be increased. In addition, in this implementation In the formula, a heat conducting member 700 may also be disposed between the circuit board 400 and the back frame 500. In this way, the thermal energy generated when the light source 120 emits light can be conducted to the heat conductive member 700 through the circuit board 400, and then transmitted to the back frame 500 by the heat conductive member 700.

FIG. 14 is a cross-sectional view showing a backlight module 9 according to a ninth embodiment of the present invention. The main difference between the present embodiment and the foregoing embodiment is that the reflection cover 114c of the reflection frame 110c of the present embodiment has the optical regulation region 1146. The optical control area 1146 faces the light incident surface 210, and the optical control area 1146 corresponds to the light incident surface 210. The partial area of the optical control area 1146 can be used for the light emitted by the light source 120 to penetrate into the light guide plate 200. Face 210.

Specifically, referring to FIG. 15 , the figure shows a perspective view of the light source module 100 and the light guide plate 200 according to FIG. 14 . As shown in Fig. 15, the optical control region 1146 has a plurality of light exiting structures 1147 and a reflecting surface 1148. The light L generated by the light source 120 can be reflected back and forth by the reflective surface 1148 and the space S of the reflective cover 114c, and exits the optical control region 1146 from the light exiting structure 1147. The light-emitting structure 1147 may be a through hole or a structure such as a non-through hole such as an indentation. In the preferred embodiment, the reflective surface 1148 is formed on one side of the optical control region 1146 toward the light source 120; the plurality of light exiting structures 1147 extend through the optical control region 1146, respectively.

Since the light L emitted by the light source 120 is reflected by the reflector 114c and then passes through the light-emitting structure 1147 of the optical control region 1146, part of the light L emitted from the light source 120 can pass through at least one reflection process before entering the guide. In the light panel 200. Therefore, even under the design of the narrow bezel, the distance from the light source 120 to the light guide plate 200 located in the visible area is short, but due to the light The path length of the line L emitted from the light source 120 to the light guide plate 200 can be elongated, so that the light can be mixed to reduce the phenomenon of uneven light and darkness.

The light-emitting structure 1147 is in the form of a circular perforation, but the shape of the perforation is not limited to the above-mentioned circular shape. In other embodiments, it may be an elliptical shape, a triangular shape, or other types of quadrangles, or even the shape of each light-emitting structure 1147. Not the same. The area of each of the perforations has the same area as a circle, that is, has an equivalent diameter d equivalent to the circle. As shown in Fig. 15, the equivalent diameter d of the light exiting structure 1147 is proportional to the distance of the light exiting structure 1147 to the projected position of the closest light source 120 on the optical control zone 1146. In other words, the light exiting structure 1147 farther from the light source 120 has a larger equivalent diameter d and a higher light penetration amount. Therefore, when the light source 120 emits light, even if the light emitted by the light source 120 is degraded during the traveling, the light-emitting structure 1147 farther away from the light source 120 allows more light to pass, and the light-emitting structure 1147 closer to the light source 120. Allowing less light to pass, the brightness of the light source module 100 along the length direction X can be relatively uniform, and the phenomenon of uneven brightness and darkness is reduced. In addition, since the phenomenon of uneven brightness and darkness can be reduced in the above manner, the spacing between adjacent two light sources 120 can be increased, that is, the number of light sources 120 can be reduced, thereby saving cost.

FIG. 16 is a cross-sectional view showing a backlight module 10 according to a tenth embodiment of the present invention. As shown in Fig. 16, the main difference between the present embodiment and the foregoing embodiment is the difference in the back frame 500a. Further, as shown in FIG. 16, the back frame 500a has a bottom plate 501 and a receiving groove 502. The bottom plate 501 is connected to the receiving groove 502. The bottom plate 501 can carry the light guide plate 200. The accommodating slot 502 accommodates the light source module 100 and accommodates the level of the bottom of the slot 502 Below the level of the bottom plate 501. More specifically, the light source 120 is carried at the bottom of the accommodating groove 502, and since the level of the bottom of the accommodating groove 502 is lower than the level of the bottom plate 501, the position of the light guide plate 200 is higher than that of the light source 120. The position can be increased to increase the height of the reflective frame 110c, thereby increasing the volume of the space S surrounded by the carrier plate 112 and the reflector cover 114c, thereby expanding the light mixing space and helping to reduce the phenomenon of uneven light and darkness.

Figure 17 is a cross-sectional view showing a backlight module 11 according to an eleventh embodiment of the present invention. The main difference between the present embodiment and the embodiment shown in Fig. 16 is the difference in the position of the light guide plate 200a. Further, the light guide plate 200a is partially carried on the bottom plate 501 and partially exposed to the notch of the receiving groove 502. More specifically, a portion of the light guide plate 200a is suspended from the opening of the accommodating groove 502 and located directly above the light source 120. Also, the light guide plate 200a of this portion shields at least part of the light source 120. In other words, the vertical projection of the light guide plate 200a of this portion on the bottom of the accommodating groove 502 overlaps at least part of the light source 120. In this way, the position of the light source 120 can be retracted below the light guide plate 200a, thereby facilitating the design of the narrow bezel. In some embodiments, in order to facilitate the light guide plate 200a directly above the light source 120, the reflective cover 114d of the reflective frame 110d may include a retracted notch 111 to accommodate a portion of the light guide plate 200a suspended from the receiving groove 502.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

1‧‧‧Backlight module

100‧‧‧Light source module

110‧‧‧Reflection frame

112‧‧‧Loading board

114‧‧‧reflector

1142‧‧‧ side panels

1144‧‧‧ top board

120‧‧‧Light source

130‧‧‧Optical Control Film

131‧‧‧First area

132‧‧‧Lighting structure

133‧‧‧Second area

200‧‧‧Light guide plate

210‧‧‧Into the glossy surface

220‧‧‧Glossy

300‧‧‧ diaphragm

400‧‧‧ circuit board

500‧‧‧ Back frame

600‧‧‧ plastic frame

700‧‧‧Heat-conducting parts

O‧‧‧ openings

S‧‧‧ Space

Claims (14)

A backlight module includes: a light guide plate having a light incident surface, the light incident mask having a length direction; and a light source module disposed adjacent to the light incident surface, comprising: a reflective frame having a carrier plate And a reflector, the carrier and the reflector are surrounded by a space, and the space has an opening facing the light incident surface; an optical control film is disposed on the carrier and covering the opening, the optical control film a plurality of light-emitting structures, wherein the light-transmitting amount of the light-emitting structures is changed along the length direction starting from a projection position of the light source on the optical control film; and at least one light source is disposed on the carrier plate. The light source emits a light that is incident on the reflector and reflected to the optical control film, and a portion of the light passes through at least one of the light exiting structures. The backlight module of claim 1, wherein the optical control film comprises a first region and a second region, wherein the light emitting structures are disposed in the first region, and the first region corresponds to the light incident surface. The backlight module of claim 1, wherein at least one of the light-emitting structures has an equivalent diameter, and the optical control film has a thickness, wherein a ratio of the equivalent diameter to the thickness is substantially less than 3.4 . The backlight module of claim 3, wherein the equivalent diameters are The light exiting structures are proportional to the distance of the closest projection location of the light source on the optical control film. The backlight module of claim 1, further comprising a back frame, the back frame having a bottom plate and a receiving slot, the bottom plate being connected to the receiving slot, the bottom plate carrying the light guide plate, the receiving slot The light source module is disposed, and a level of the bottom of the receiving groove is lower than a level of the bottom plate. The backlight module of claim 5, wherein the light guide plate portion is carried on the bottom plate and partially exposed to the notch of the accommodating groove, and the portion of the light guide plate exposed to the notch is in the accommodating groove The vertical projection on the bottom overlaps at least a portion of the light source module. The backlight module of claim 1, wherein the optical control film is integrally formed with the reflective cover. The backlight module of claim 1, wherein the reflector has an angle with the carrier plate, the angle being less than 90 degrees. A backlight module includes: a light guide plate having a light incident surface, the light incident mask having a length direction; and a light source module disposed adjacent to the light incident surface, comprising: a reflective frame having a carrier plate And a reflector, the carrier and the reflector are surrounded by a space, the reflector has an optical control area, the optical The control region is facing the light incident surface and the optical control region has a range corresponding to the light incident surface, the optical control region has a plurality of light emitting structures, and the light passing amount of the light emitting structures is closest to the light source in the optical regulation a projection position on the region is a starting point along the length direction; and at least one light source is disposed on the carrier plate, the light source emits a light that is incident on the reflector and reflected to the optical control region, and the light is partially Passing at least one of the light exiting structures. The backlight module of claim 9, wherein at least one of the light-emitting structures has an equivalent diameter, and the optical control region has a thickness, wherein a ratio of the equivalent diameter to the thickness is substantially less than 3.4 . The backlight module of claim 10, wherein the equivalent diameters are proportional to the distances of the light-emitting structures to the closest projection position of the light source on the optical control region. The backlight module of claim 9, further comprising a back frame, the back frame having a bottom plate and a receiving slot, the bottom plate being connected to the receiving slot, the bottom plate carrying the light guide plate, the receiving slot The light source module is disposed, and a level of the bottom of the receiving groove is lower than a level of the bottom plate. The backlight module of claim 12, wherein the light guide plate is partially carried on the bottom plate and partially exposed to the notch of the accommodating groove, and the portion of the light guide plate exposed to the notch is in the accommodating groove The vertical projection on the bottom overlaps at least a portion of the light source module. The backlight module of claim 9, wherein the reflector is at an angle to the carrier plate, the angle being less than 90 degrees.