JP4339616B2 - LCD display backlight module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a kind of liquid crystal display backlight module, and more particularly, to a fixing method in which a reflector and a fixing cover are simultaneously fixed to one side of a light guide plate.
[0002]
[Prior art]
The backlight module is a key component of the liquid crystal display panel, and the liquid crystal itself does not emit light, so the function of the backlight module provides a light source with sufficient brightness and distribution to display a normal image on the liquid crystal display panel. There is to do. Liquid crystal display panels are applied to many electronic products with growth potential, such as monitors, notebook computers, digital cameras, projectors, and the demand for backlight modules and related components continues to grow. . At present, light guide plates and liquid crystal backlight modules that are indispensable for liquid crystal displays are being developed every year to reduce the size and weight. In addition, the increase in the heat dissipation, the improvement in brightness, and the improvement in the function of miniaturization have a great influence and assistance on the performance improvement of the liquid crystal display.
[0003]
Thus, the method for reducing the size and weight of the components of the backlight module is extremely useful for the application of the liquid crystal display panel. Both the reflection plate that allows the light emitted from the lamp to completely enter the light guide plate and has a heat radiation and fixing function, and the fixed cover that has the fixing and heat radiation functions also promote the development of the backlight module.
[0004]
FIG. 1 is a partial three-dimensional view of a known backlight module. A known backlight module includes a light guide plate 10 and a fixed cover 12 fixed to the plane of the light guide plate 10. The fixed cover 12 comprises three parts, namely a first part 14, a second part 16 and a third part 18. The first portion 14 and the second portion 16 are connected by a bent portion, and the second portion 16 and the third portion 18 are connected to each other and are perpendicular to each other. The reflection plate 20 includes two parts. The two parts include a first reflection plane 22 and a second reflection plane 24. The first reflection plane 22 and the second reflection plane 24 are vertical and are connected to each other. . The fixed cover 12 is in contact with the plane of the light guide plate 10 at the first portion 14, a part of the second portion 16 is in contact with the outside of the first reflection plane 22 of the reflection plate 20, and a part of the second portion 16 is light guide plate. The first portion 14 of the fixed cover 12 is connected to the first cover 14 in a bending manner. In addition, the third portion 18 of the fixed cover 12 is in contact with the outside of the second reflection plane 24 of the reflection plate 20.
[0005]
FIG. 2 is a cross-sectional view of a known backlight module taken along line 2-2 in FIG. The fixed cover 12 is fixed on the light guide plate 10. The fixed cover 12 includes a first portion 14, a second portion 16, and a third portion 18. The first portion 14 is connected to the second portion 16 at a bent portion, and the bent portion between the first portion 14 and the second portion 16 is bent. The portion is designed to increase the mechanical strength of the fixed cover 12 and prevent tearing. The second part 16 is connected to the third part 18 and is perpendicular to each other.
[0006]
The reflection plate 20 covers the lamp 26 on the inside, and the reflection plate 20 includes three reflection planes, that is, a first reflection plane 22, a second reflection plane 24, and a third reflection plane 28. The first reflection plane 22 is vertically connected to the second reflection plane 24, and the second reflection plane 24 is vertically connected to the third reflection plane 28. In addition, a similar structure is formed in the hollow by vertically connecting the three reflecting planes to each other so as to surround the lamp 26, thereby reflecting the light emitted from the lamp 26 by the three reflecting planes of the reflecting plate 20. Then, the light beam enters the light guide plate 10.
[0007]
In addition, the reflection plate 20 contacts the light guide plate 10 at a part of the third reflection plane 28, and holds the light guide plate 10 together with the fixed holding portion 30, so that the reflection plate 20 is placed on the side of the light guide plate 10. It is fixed. The first portion 14 of the fixed cover 12 contacts the plane of the light guide plate 10, and the fixed cover 12 is fixed on the light guide plate 10. A portion of the second portion 16 contacts the outside of the first reflection plane 22 of the reflector 20, a portion of the second portion 16 is located above the plane of the light guide plate 10, and is bent to form the first portion 14 of the fixed cover 12. It is connected. The third portion 18 of the fixed cover 12 is in contact with the outside of the second reflection plane 24 of the reflector 20, thereby strengthening the fixing strength of the reflector 20 to the light guide plate 10, and the thermal energy of the reflector 20. Is transmitted through the heat conduction and dispersed in the fixed cover 12, thereby increasing the heat radiation effect by increasing the heat radiation area.
[0008]
The reflection plate 20 surrounds the lamp 26, and the light beam of the lamp 26 completely enters the light guide plate 10, and the light beam is projected from the plane of the light guide plate 10 uniformly and brightly. In addition, since the lamp 26 itself generates heat energy, and the light beam generated by the lamp 26 also increases the heat energy of the reflecting plate 20 itself, the reflecting plate 20 must have a heat dissipation function. A problem occurs in the operation of the lamp 26 due to internal overheating of the reflector 20. In order to achieve an optimal incident effect on the light beam entering the light guide plate 10, the positions of the lamp 26 and the reflecting plate 20 need to be fixed. Otherwise, the relative positions of the reflecting plate 20 and the lamp 26 are easily changed. Thus, the uniformity of the light rays incident on the light guide plate 10 is affected. Therefore, it is necessary to improve the reflection plate on the premise that the basic function of the reflection plate is maintained.
[0009]
In addition, the fixed cover 12 fixes the reflecting plate 20 and the lamp 26 to the side of the light guide plate 10, enhances the bending resistance of the backlight module, and has a heat dissipation function. However, according to a well-known technique, a part of the traditional fixed cover 12 is directly fixed to the plane of the light guide plate 10 and another part completely surrounds the outside of the reflector 20, so that the heat radiation of the reflector 20 is reduced. The effect of heat dissipation cannot be achieved unless the fixed cover 12 is transmitted. However, for this reason, the heat dissipation effect is not ideal. The fixed cover 12 surrounds the outside of the reflection plate 20 to increase the thickness and weight of the backlight module in response to the development of lightening and thinning pursued by the backlight module.
[0010]
Since the fixed position of the reflector 20 affects the thickness of the backlight module, it needs to be improved.
[0011]
In terms of heat dissipation, if the area of heat dissipation is increased, the efficiency of heat dissipation becomes better, and the operation of the entire backlight module is stabilized. However, if the area of the fixed cover 12 is increased in order to increase the heat radiation area, not only the cost of the fixed cover 12 is increased, but also the weight of the fixed cover 12 is added, and the weight reduction of the entire backlight module is pursued. As a result, it leaves the direction. In order to reduce the weight and thickness of the entire backlight module, the thickness and weight of the backlight module must be reduced while maintaining the original heat dissipation efficiency. Therefore, a thin backlight module with high heat dissipation efficiency is an important point of the present invention.
[0012]
[Problems to be solved by the invention]
As described in the above-mentioned prior art, there are many drawbacks to the conventional fixing method between the reflector and the fixed cover, and the present invention improves the fixing method of the reflector and the fixed cover. A method is provided to improve the shortcomings of known techniques.
[0013]
The purpose of the present invention is to make only a part of the fixed cover come into contact with the reflecting plate under the premise that the reflecting plate and the fixing cover are fixed to the light guide plate in order to increase the heat radiation efficiency of the backlight module. Is to increase the heat dissipation area by not covering the outside of the reflector, thereby increasing the heat dissipation efficiency.
[0014]
Another object of the present invention is to reduce only the thickness of the backlight module by reducing the thickness outside the reflector by contacting only a part of the fixed cover with the reflector and not completely covering the outside of the reflector. It is to reduce the thickness and make it thinner.
[0015]
Still another object of the present invention is to reduce the manufacturing cost and weight of the backlight module, by using the fixed cover in such a manner that only a part of the fixed cover is brought into contact with the reflector and the reflector is not completely covered. The area is reduced, the cost of the fixed cover of the backlight module is reduced, and the weight of the fixed cover is reduced, thereby reducing the overall weight of the backlight module.
[0016]
[Means for Solving the Problems]
The invention according to claim 1 is a backlight module,
A light guide mechanism;
A lamp installed on one side of the light guide mechanism; and
A reflector , wherein the lamp is installed on the inside, and includes a clamping part used for fixing the reflector to the light guide mechanism ; and
A fixing means, one positioned on a surface, comprising a first plane portion and a second flat portion located only且one said surface, said first planar portion is said second planar portion of the light guide mechanism is connected to, said first planar portion is in contact with the surface of the light guide mechanism, said second planar portion is in contact with該挟lifting portion of the reflector, as well as the force in該挟lifting unit,該挟lifting unit The fixing means for fixing the light guide mechanism to the surface of the light guide mechanism, and the fixing means incompletely covers the reflector and the light guide mechanism ;
The backlight module is characterized by comprising
The invention of claim 2 is the backlight module according to claim 1, wherein the fixing means is provided with a plurality of holes.
According to a third aspect of the present invention, there is provided the backlight module according to the first aspect, wherein the fixing means has a partially flat bulge.
According to a fourth aspect of the present invention, there is provided the backlight module according to the first aspect, wherein the reflecting plate is formed with a partially flat bulge.
[001 7 ]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a structure of a liquid crystal display backlight module, and more particularly, to a fixing method for both a reflector on one side of a light guide plate and a fixed cover. The reflector of the present invention is well fixed to the light guide plate and encloses the lamp. The fixed cover is also fixed to the light guide plate, but the reflective plate is incompletely covered, a part of the fixed cover comes into contact with a part of the reflective plate, and both the fixed cover and the reflective plate are well fixed to the light guide plate. Since the fixed cover and the reflector are in contact with each other, the heat radiation area is increased and the material cost is reduced.
[001 8 ]
【Example】
FIG. 3 is a partial three-dimensional view of a backlight module according to the present invention. The backlight module of the present invention includes a light guide mechanism, a fixing means, a reflecting plate 42, and a lamp 52 that is a light source device.
[00 19 ]
The light guide mechanism is a light guide plate 32, and the light guide plate 32 has two planes and four sides. The fixed cover 34 is fixed to one plane of the light guide plate 32 and is positioned on one side portion, and the fixed cover 34 is a first portion 36 that is a first plane portion and a second portion that is a second plane portion. The first portion 36 is connected to the second portion 38 at the bent portion, and the second portion 38 is connected to the third portion 40 at the bent portion. A bent portion between the first portion 36 and the second portion 38 is provided to increase the mechanical strength of the stationary cover 34 to prevent tearing, and a bent portion between the second portion 38 and the third portion 48, and The bent portion between the second portion 38 itself is also designed to increase the mechanical strength of the fixed cover 34.
[00 20 ]
The reflection plate 42 is connected to one side of the light guide plate 32, and this side is the same side as the fixed cover 34. The reflection plate 42 includes a fixed holding portion 44, a first reflection plane 46, and a second reflection plane 48. The fixed holding portion 44 is in contact with the plane of the light guide plate 32, and is connected to the first reflection plane 46 so as to perform the first reflection. Another side of the plane 46 is vertically connected to the second reflection plane 48. The first portion 36 of the fixed cover 34 and the plane of the light guide plate 32 are in contact with each other, whereby the fixed cover 34 is fixed on the light guide plate 32. The third portion 40 of the fixed cover 34 is in contact with the fixed clamping portion 44 of the reflecting plate 42. 4 is a cross-sectional view taken along line 4-4 of FIG. 3 of the present invention.
[002 1 ]
As shown in FIG. 4, the reflector 42 further includes a third reflection plane 50, and the third reflection plane 50 is vertically connected to the second reflection plane 48, and therefore, the first reflection plane 46 and the second reflection plane. 48 and the third reflection plane 50 jointly form a hollow portion which is a hollow space. The third reflection plane 50 has one side connected perpendicularly to the second reflection plane 48, and the other side plane is in contact with the plane of the light guide plate 32 in the form of a plane, and joints with the fixed clamping portion 44 of the reflection plate 42. Thus, the light guide plate 32 is sandwiched, whereby the reflection plate 42 is fixed on the light guide plate 32 to form a so-called sandwiching portion. A lamp 52, which is a light emitting device, is provided in a hollow portion formed by the first reflection plane 46, the second reflection plane 48, and the third reflection plane 50 of the reflection plate 42. The lamp 52 is a light emitting diode, a cold cathode tube ( CCFL; Cold Cathode Fluorescent Lamp), halogen lamp.
[002 2 ]
When the lamp 52 starts operation, a part of the light beam generated by the lamp 52 directly enters the light guide plate 32, and another part of the light beam is the first reflection plane 46, the second reflection plane 48, and the second reflection plane 42 of the reflection plate 42. The three reflection planes 50 are jointly introduced into the light guide plate 32, or some of the light rays are absorbed and in contact with the parts to generate heat energy. If the heat energy generated by the lamp 52 itself and the heat energy generated by absorbing the light are not released appropriately by the heat dissipation design, the operation of the entire backlight module will be affected. This is one of the points that require extreme caution during operation and design.
[002 3 ]
The thermal energy divergence is conducted to each reflection plane of the reflector 42 and the side of the light guide plate 32 by a thermal radiation method of light emitted from the lamp 52 and a thermal convection method formed by the temperature of the lamp 52 itself. When the heat energy is transferred to the side of the light guide plate 32, a part of the heat is transferred to the plane of the light guide plate 32 by a heat conduction method, and further from the two planes of the light guide plate 32, the fixed clamping portion 44 of the reflection plate 42. The third reflection plane 50 and the first portion 36 of the fixed cover 34 are transmitted. Since the reflection plate 42 and the fixed cover 34 are made of a metal having a very high heat conduction speed, the heat transmitted to the fixed holding portion 44 of the reflection plate 42, the third reflection plane 50 and the first portion 36 of the fixed cover 34. The energy is taken away by air in the manner of heat convection, and is also transferred to the second reflection plane 46, the second reflection plane 48, and the third reflection plane 50 of the second portion 38, the third portion 40 of the fixed cover 34 and the reflector 42. Heat energy is taken away by the air that is transmitted very quickly and in contact with it, thus achieving a heat dissipation effect.
[002 4 ]
Similarly, when the heat energy generated by the lamp 52 is transmitted to the first reflection plane 46, the second reflection plane 48, and the third reflection plane 50 of the reflector 42 in a manner of heat radiation and heat convection, the heat energy is heat convection. The thermal energy of the first reflecting plane 46, the second reflecting plane 48, and the third reflecting plane 50 is taken away by the air, and the reflecting plate 42 is fixed by heat conduction. It is transmitted to the sandwiching portion 44 and the fixed cover 34 and is taken away by air in a heat convection manner. As a result, when the heat dissipation area of both the reflector 42 and the fixed clamping part 44 increases, the area of the thermal energy of the reflector 42 and the fixed clamping part 44 that is taken away by the external air by the thermal convection method also increases, and the heat dissipation effect is naturally It becomes good.
[002 5 ]
As shown in FIG. 4, only the third portion 40 of the fixed cover 34 is in contact with the fixed clamping portion 44 of the reflector 42, and the fixed cover 34 completely covers the area outside the reflector 42 as in the prior art. Therefore, the present invention can reduce the cost of the portion of the fixed cover 34 that was originally covered outside the reflector 42, and the size of the portion of the fixed cover 34 that covers the outside of the reflector 42 can be reduced. Reduce the difficulty of designing to match In the well-known technique, an assembly flow for folding the fixed cover 34 and surrounding the outside of the reflection plate 42 is necessary. However, the present invention does not need it and can further save assembly time. In addition, the fixed cover 34 does not cover the outside of the reflecting plate 42 and only part of the fixed cover 34 comes into contact with the fixed clamping portion 44 of the reflecting plate 42. Therefore, the overall thickness of the backlight module can be reduced.
[002 6 ]
In short, the fixed cover and reflector of the present invention are not fixed to the backlight module, and the fixed cover does not cover the reflector and is only a small part of the fixed cover located on the light guide plate plane. In contact with a part of the reflector located on the same plane of the light guide plate, thereby reducing the overall thickness of the backlight module, increasing the heat dissipation area of the reflector and the fixed cover, and increasing the overall lamp heat dissipation area, The heat dissipation effect can be enhanced. In addition, since only a part of the fixed cover is in contact with the reflector, the material cost of the fixed cover can be reduced, and a design process for bending the fixed cover to adjust the dimensions to the outer periphery of the reflector is unnecessary. This is useful for increasing the speed of the assembly flow of the entire reflector and fixed cover.
[002 7 ]
The increase in the heat radiation area can be determined by the area of the fixed cover shown in FIGS. The width of both the fixed cover 12 and the reflector 20 is c, and as shown in FIG. 2, the height of the third portion 18 of the fixed cover 12 is b, and the first portion 14 and the second portion of the fixed cover 12 are If the total length of the portion 16 is a, the heat radiation area of the fixed cover 12 and the reflector 20 is about (a + b) × c, and the height of the third portion 18 of the fixed cover 12 and the reflection of the present invention are well known in the art. The height of the second reflection plane 48 of the plate 42 is such that the width of both the fixed cover 34 and the reflection plate 42 in FIG. The total length of the first reflecting plane 46 and the fixed cover 34 is (1.3a +) × c, and the heat radiation area of the fixed cover 34 and the reflecting plate 42 of the present invention is at least 0.5ac larger than that of a known technique, The heat dissipation effect is naturally good.
[002 8 ]
In terms of material saving, the total area of the fixed cover 12 of the known technology of FIG. 2 is about (a + b) × c, and the height of the second reflection plane 48 of the reflector 42 in FIG. 4 of the present invention is b. In this case, the total length of the first portion 36, the second portion 38, and the third portion 40 of the fixed cover 34 is 0.8a, that is, the total area of the fixed cover 34 is 0.8ac. The cost of the fixed cover material having an area of (a + b) × c to at least (0.2a + b) × c can be reduced, and the weight of the entire backlight module can be reduced.
[002 9 ]
In view of the side height, if the side height of the reflector of the present invention is not the same as that of the well-known fixed cover, the fixed cover of the present invention does not need to cover the outer side of the reflector, and therefore further The altitude of the fixed cover can be reduced, and the altitude can be reduced by a certain amount compared to the backlight module, which matches the development trend of thinner and lighter backlight modules.
[00 30 ]
Of course, the present invention can be modified in other forms. For example, as shown in FIG. 9, holes 54 are added to the fixed cover 34 and the reflecting plate 42 to help increase heat dissipation efficiency and save material. However, a configuration in which the weight is reduced or a configuration in which the flat raised portion 56 is increased in the fixed cover 34 to increase the heat radiation area and the mechanical strength of the fixed cover 34 is increased is possible. In order to further increase the heat radiation area and mechanical strength of the reflecting plate 42 itself, a configuration in which the planar raised portion 58 is increased on the reflecting plate 42 is also possible.
[003 1 ]
The above is a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modification or alteration in detail that may be made based on the present invention shall fall within the scope of the claims of the present invention. To do.
[003 2 ]
【The invention's effect】
In order to increase the heat radiation efficiency of the backlight module, the present invention is based on the premise that the reflector and the fixed cover are well fixed to the light guide plate. The heat dissipation area is increased by not covering the outside of the plate, thereby increasing the heat dissipation efficiency.
[003 3 ]
In the present invention, only a part of the fixed cover is brought into contact with the reflecting plate, and the thickness outside the reflecting plate is reduced by a system that does not completely cover the reflecting plate, thereby reducing the thickness of the backlight module. Can be reduced in thickness.
[003 4 ]
In order to reduce the manufacturing cost and weight of the backlight module, the present invention also reduces the use area of the fixed cover by bringing only a part of the fixed cover into contact with the reflector and does not completely cover the reflector. The cost of the fixed cover of the module is reduced, and the weight of the fixed cover is reduced, thereby reducing the overall weight of the backlight module.
[Brief description of the drawings]
FIG. 1 is a partial three-dimensional view of a known backlight module.
FIG. 2 is a cross-sectional view of a known backlight module taken along line 2-2 in FIG.
FIG. 3 is a partial three-dimensional view of a backlight module according to the present invention.
4 is a cross-sectional view taken along line 4-4 of FIG. 3 of the present invention.
FIG. 5 is a plan view of the backlight module of the present invention.
FIG. 6 is a lamp temperature data table of a known backlight module.
FIG. 7 is a lamp temperature data table of the backlight module of the present invention.
FIG. 8 is a relationship diagram between lamp temperature and luminance.
FIG. 9 is a partial three-dimensional view of a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Light guide plate 12 Fixed cover 14 1st part 16 2nd part 18 3rd part 20 Reflector plate 22 1st reflective plane 24 2nd reflective plane 26 Lamp 28 3rd reflective plane 30 Fixed clamping part 32 Light guide plate 34 Fixed cover 36 First 1 part 38 2nd part 40 3rd part 42 reflector 44 fixed clamping part 46 1st reflection plane 48 2nd reflection plane 50 3rd reflection plane 52 lamp 54 hole 56 plane bulge part 58 plane bulge part a total length of fixed cover b Backlight module width c Length of both fixed cover and reflector A, B, C Position of lamp temperature measurement

Claims (4)

In the backlight module,
A light guide mechanism;
A lamp installed on one side of the light guide mechanism; and
A reflector , wherein the lamp is installed on the inside, and includes a clamping part used for fixing the reflector to the light guide mechanism ; and
A fixing means, one positioned on a surface, comprising a first plane portion and a second flat portion located only且one said surface, said first planar portion is said second planar portion of the light guide mechanism is connected to, said first planar portion is in contact with the surface of the light guide mechanism, said second planar portion is in contact with該挟lifting portion of the reflector, as well as the force in該挟lifting unit,該挟lifting unit The fixing means for fixing the light guide mechanism to the surface of the light guide mechanism, and the fixing means incompletely covers the reflector and the light guide mechanism ;
A backlight module characterized by comprising:   2. The backlight module according to claim 1, wherein the fixing means is provided with a plurality of holes.   2. The backlight module according to claim 1, wherein the fixing means has a partially flat ridge.   2. The backlight module according to claim 1, wherein the reflecting plate is formed with a partially flat ridge.

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