WO2005096080A1

WO2005096080A1 - Backlighting assembly for liquid crystal display device

Info

Publication number: WO2005096080A1
Application number: PCT/CN2004/000292
Authority: WO
Inventors: Xindao Huang; Junjie Zhu
Original assignee: Quanta Display Inc.
Priority date: 2004-03-31
Filing date: 2004-03-31
Publication date: 2005-10-13

Abstract

The present invention relates to a backlighting assembly used for Liquid Crystal Display device. The both sides of the reflective board (2) are bent upward to cover the Tight generating unit (4) in order to perform the function of shade. By covering a metal silica gel sheath which may insulate the electromagnetic disturbance and/or coating or covering a metal which can insulate the electromagnetic disturbance on the either surface of the reflective board (2), the problem of electromagnetic disturbance was overcomed.

Description

Backlight module for liquid crystal display device TECHNICAL FIELD

The present invention relates to a backlight module for a liquid crystal display device, and more particularly, to a backlight module for a liquid crystal display device, that is, a lamp cover that uses a reflection plate as a reflection light generating unit. . Background technique

The backlight module used in the existing liquid crystal display generally includes a supporting frame, a light guide plate, a light tube module, a reflective plate disposed below the light guide plate, and several kinds of optical films disposed above the light guide plate. For example: diffusion film, light collection film, light enhancement film and prism film. The lamp module generally includes a U-shaped reflecting sheet as a lamp cover, so as to reflect the light emitted by the lamp to the light guide plate, and thereby guide the light of the lamp to the front liquid crystal display panel.

However, in the existing backlight module, the lamp tube is placed in the U-shaped lamp cover. In practice, the backlight module is often formed in a local area due to poor contact between the lamp tube group of the U-shaped lamp cover and the light guide plate. Dark areas, light leakage, or wrinkles and dark lines. In addition, the U-shaped lampshade is generally made of metal and has a hardness that is harder than that of the light guide plate. Therefore, the light guide plate is easy to be scratched and dust is generated during assembly or module rework.

The lamp module of the existing backlight module is held by a plastic frame (that is, a supporting frame). When the backlight module is assembled, the plastic frame needs to be fixed by using assembly screws. The plastic frame deforms and presses the tube, causing the tube to bend. This will cause a dark area on the display and affect the display quality of the LCD display.

In addition, the lamp cover and the reflective plate used in the existing backlight module are easily pressed against each other. As a result, the reflection plate is wrinkled due to squeezing.

In addition, in the existing backlight module, the lamp cover of the lamp tube module, the light guide plate, and the reflection plate are closely connected to each other. After the backlight module and the liquid crystal panel form a liquid crystal display, a shock test is performed. The lamp cover of the lamp module is easy to squeeze the light guide plate and the reflective plate to deform the mutually squeezed components, causing the impact test to fail. In other words, the tolerance of the liquid crystal display to impact or impact is reduced. In this way, some external force of the liquid crystal display in a normal use state will affect its display quality or even a state in which it cannot be used.

Therefore, those skilled in the art have tried to make a backlight module that does not require this: a lampshade. For example: A liquid crystal display device without using a lamp cover. This technology uses a ring-shaped tube instead of a linear light-generating unit. In addition, this technology replaces the existing lampshade with a reflector that completely covers the lamp tube. However, since one of the main purposes of the metal lamp cover used in the existing lamp module is to shield the lamp electrode from electromagnetic interference, the problem of image quality caused by electromagnetic interference image signals can be avoided. Therefore, this technology causes electromagnetic interference problems because the existing lampshade is not used. Furthermore, the problem of wrinkles caused by the temperature change of the existing reflectors still exists in the aforementioned patents.

In addition, there is a structure of a backlight module in the prior art. It bends the lampshade or reflector to form an upper plate to avoid light leakage and wrinkling. However, similarly, because this technology does not use the existing metal lampshade, the problem of electromagnetic interference will still exist. Summary of the invention

In view of the above problems, an object of the present invention is to provide a backlight module for a liquid crystal display device.

In order to achieve the object of the present invention, the present invention provides a backlight module for a liquid crystal display device, which includes: a supporting frame, at least one light generating unit: ¾, a reflecting plate And a light guide. There are supporting elements on the supporting frame. A fitting element is provided on each end of at least one light generating unit. The reflecting plate is placed on the supporting frame, and both sides of the reflecting plate are bent upward, and the light generated by the at least one light generating unit is reflected upward. The light guide plate is disposed on the reflection plate, and is configured to guide light generated by the at least one light generating unit to a liquid crystal display panel. Wherein, a metal capable of isolating electromagnetic interference is provided on a surface of the reflecting plate, a surface of the fitting element, or a combination thereof.

The invention also provides a backlight module for a liquid crystal display device, which includes a supporting frame, a reflecting plate, a light guide plate and at least one light generating unit. The reflecting plate is disposed on the supporting frame, and both sides of the reflecting plate are bent upward. The light guide plate is disposed on the reflective plate, and a groove is provided on each side of the light guide plate, and a beat component is arranged in the groove. At least one light generating unit is disposed in the groove of the light guide plate, the reflecting plate reflects the light generated by the at least one light generating unit upward, and the light guide plate directs the light generated by the at least one light generating unit to a liquid crystal display panel Each of two ends of the at least one light generating unit is provided with a fitting element. Among them, a metal capable of isolating electromagnetic interference is disposed on a surface of the reflecting plate, a surface of the fitting element, or a combination thereof.

The present invention also provides a backlight module for a liquid crystal display device, which includes a supporting frame, at least one light generating unit, a reflecting plate, and a light guide plate. A fitting element is provided on each end of the at least one light generating unit. The reflecting plate is disposed between the at least one light generating unit and the supporting frame. Both sides of the reflecting plate are bent upward, and the light generated by the at least one light generating unit is reflected upward. The light guide plate is disposed on the reflective plate to direct the light generated by the at least one light generating unit to a liquid crystal display panel, and there is a supporting element on the light guide plate. Wherein, a metal capable of isolating electromagnetic interference is provided on a surface of the reflecting plate, a surface of the fitting element, or a combination thereof.

According to the backlight module for a liquid crystal display device of the present invention, the existing lamp tube provided with a lamp cover can avoid the possibility that the lamp cover will interfere with the reflection plate or the light guide plate itself due to the lamp cover, can prevent light source leakage, and produce Dark areas and wrinkles Possible shortcomings such as electromagnetic interference.

According to the backlight module for a liquid crystal display device of the present invention, the light generating unit is covered by bending the two sides of the reflecting plate upwards, replacing the function of a lampshade in the existing lamp tube module, and using a metal that can isolate electromagnetic interference. And / or coated on the opposite surface of the reflective surface of the reflective plate with a metal that can isolate electromagnetic interference to overcome the problem of electromagnetic interference.

In addition, the reflecting plate that functions as a lampshade can also be divided into two elements to cover the light generating unit, for example, an L-shaped cover is used to cover the reflecting plate f under the light guide plate to reduce the light generating unit. The heat generated during use affects the light guide plate, the reflection plate, and the like. The cooperation between the L-shaped cymbal cover and the lower reflecting plate can be fixed by the cooperating mating elements provided on the light guide plate and the L-shaped upper cover, and the lower reflecting plate can be slightly bent upward to match The L-shaped upper cover overlaps to prevent light leakage. With this design, the problem of wrinkling of the reflecting plate caused by the change of the surrounding temperature due to the heat generated by the light generating unit can be reduced. According to still another embodiment of the backlight module for a liquid crystal display device of the present invention, the light source generating unit is disposed on one or both sides of the light guide plate, and one of the light source generators to be provided on the light guide plate is used. A pair of supporting elements that can support the light generating unit in the living room are extended from the side to support the fitting elements (also known as silicone sleeves) provided at both ends of the light generating unit. A light-reflecting plate extending from the bottom of the light guide plate with a predetermined length is bent from the bottom up to cover the light generating unit, and the light-reflecting plate functions as a lampshade.

According to the backlight module for a liquid crystal display device of the present invention, since an inverted I-inch plate is used to extend the length and wind the light generating unit without using a traditional lampshade, it is possible to avoid possible problems in the existing backlight modules. When the lamp tube module is assembled, the lamp cover is pressed by the reflection plate to cause wrinkles due to force, and the light generating unit of the present invention may be disposed on the supporting frame. Brackets or light guide plates, making assembly easier and reducing manufacturing costs.

According to the above embodiments of the present invention, the existing lamp tube provided with a lampshade can be prevented from causing light leakage, dark areas, wrinkles or other problems caused by the lampshade and the reflection plate or the light guide plate itself due to poor matching. Disadvantages such as electromagnetic interference without a lampshade. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of an embodiment of a spoon backlight module for a liquid crystal display device according to the present invention;

2 is a schematic view of another embodiment of a backlight module for a liquid crystal display device according to the present invention;

3 is a schematic view of another embodiment of a backlight module for a liquid crystal display device according to the present invention;

4 is a partial schematic view of a fitting operation of a fitting element provided in the light generating unit in FIG. 1 and a supporting element provided on the supporting frame;

FIG. 5 is a partial schematic view of a fitting operation of a fitting element provided in the light generating unit in FIG. 2 with a supporting element provided in a groove of the light guide plate; FIG.

FIG. 6 is a partially enlarged schematic view of a fitting operation of a fitting element provided in the light generating unit in FIG. 3 with a supporting element on a support frame extended on one side of the light guide plate; FIG. 7 is a schematic view of FIG. 1. A cross-sectional view of an embodiment of a backlight module for a liquid crystal display device of the present invention; and

FIG. 8 is a cross-sectional view of an embodiment of a backlight module for a liquid crystal display device of the present invention shown in FIG. 2. detailed description

The present invention will be further explained by the following detailed description in conjunction with the accompanying drawings It should be noted that the description and drawings are only for making it easier for those skilled in the art to understand the present invention, rather than limiting the scope of the present invention. Please refer to Figure 1 first. FIG. 1 is a schematic diagram of an embodiment of a backlight module for a night crystal display device according to the present invention, which is used to explain the relative relationship between the components of the backlight module before being combined. The backlight module for a liquid crystal display device of the present invention includes a supporting frame 1 for supporting each element, a reflecting plate 2 for reflecting light to the light guide plate 3, and 2 for guiding light generated by the light generating unit 4 The light guide plate 3 of the display panel, a light generating unit 4 that generates light, and one or more optical films 5. At both ends of the side of the supporting frame 1 on which the light generating unit 4 is to be disposed, supporting elements 11 for supporting the light generating unit 4 are respectively disposed. In order to clearly express the position of the supporting element 11 in the supporting frame 1, in FIG. 4, one end corner of the supporting frame 1 shows the supporting element 11 in a manner of cutting the periphery; in fact, the supporting frame 1 is not on the side. resection. Furthermore, the fitting element 41 may be a hollow column, and one end of the light generating unit 4 is sleeved into the fitting element 41. In FIG. 1, an end where the left light generating unit 4 is placed in the fitting element 41 is indicated by a broken line, so as to understand the combination relationship between the light generating unit 4 and the fitting element 41 in a clear manner. A fitting element 41 is provided at each end of the light generating unit 4 so that the light generating unit 4 is fitted into the supporting element 11 provided on the supporting frame 1, and a conducting wire 44 is provided on the fitting element 41 to communicate with the supporting element 11. The other units are electrically connected. The two sides of the reflecting plate 2 extend outward by a predetermined length at a position corresponding to the position where the light generating unit 4 is to be arranged, and the light generating unit 4 is folded and covered with the extended length, thereby generating the function of a photomask. The reflecting plate 2 can be fixed on the supporting frame 1 and the light guide plate 3 by means of sticking (such as double-sided tape) or engaging elements (such as a convex point and a concave point). In FIG. 1, the right ^ of the reflection plate 2 is the shape after the display is completed, and the left side is the shape before the display is completed. .

Among them, in order to eliminate electromagnetic interference, The surface of the composite element 41 and / or any surface of the reflective surface of the reflective plate 2 is coated, covered, or pasted with a metal (not shown in the figure) that can isolate electromagnetic interference. The lower surface of the reflective surface (that is, the surface on the opposite side of the light guide plate). This can eliminate possible electromagnetic interference. Among the metals that can isolate electromagnetic interference, metals that have electromagnetic isolation effects such as copper (Cii), nickel (Ni), aluminum (A1), or a combination thereof can be used. In the backlight module for a liquid crystal display device of the present invention, the number of the light generating units may be one or more, depending on the design or use. However, it is generally two light generating units, which are arranged at two ends of the backlight module.

FIG. 4 is a partial schematic view of the fitting operation of the fitting element 41 provided in the light generating unit 4 in FIG. 1 and the supporting element 11 provided on the supporting frame 1.

FIG. 7 is a cross-sectional view formed by combining the backlight module for the liquid crystal display device of the present invention shown in FIG. 1 along the cross-section line formed by the support elements 11 on the left and right sides. In order to succinctly illustrate the diagram and avoid the problem of understanding the present invention with the hatching, the hatching LB is not shown in FIG. 1. In this embodiment, it is shown that the reflector is used to directly extend a pre-length and bend to cover the light generating unit to generate a lampshade. Of course, as described above, the reflecting plate with the lampshade function can also be divided into two components (such as: an upper cover group and a reflective lower plate) to cover the light generating unit, for example, an L-shaped upper cover group is used to cooperate with the guide. The reflecting plate under the light plate is covered to reduce the influence of the heat generated by the light generating unit on the elements such as the reflecting plate during use. The cooperation between the L-shaped upper cover and the lower reflective plate can be fixed by the mating fitting elements provided on the light guide plate and the L-shaped upper cover, and the two ends of the lower reflective plate can be bent slightly upward Overlap with this L-shaped cover to avoid light leakage. With this design, the problem of wrinkling of the reflecting plate caused by the heat generation i of the light generating unit to change the surrounding temperature can be reduced.

See Figure 2 next. FIG. 2 is a schematic diagram of a backlight module for a liquid crystal display device according to the present invention; A schematic diagram of another embodiment. The backlight module for a liquid crystal display device of the present invention includes a supporting frame for supporting each element, a reflecting plate for reflecting light to the light guide plate 3, and a light guide for guiding the light generated by the light generating unit 4. A light guide plate 3 of the display panel, a light generating unit 4 that generates light, and one or more optical films 5. A groove is provided on both sides of the light guide plate 3, and supporting elements 31 for supporting the light generating unit 4 are respectively provided on both ends of the groove. The light generating unit = A fitting element 41 is provided at each end of the light generating unit for fitting with the support element 31 provided in the groove of the light guide plate 3. Furthermore, a conductive wire 44 is provided on the fitting element 41 for electrical connection with other units. In addition, the reflective plate 2 is extended by a predetermined length on both sides, and the extended length is used to bend and cover the light generating unit 4 so as to generate the function of the photomask. Similarly, in FIG. 2, the right side of the reflection plate 2 is the shape after the display is completed, and the left side is the shape before the display is completed, to make it easier to understand this embodiment.

In this embodiment, the surface of the fitting element 41 provided at both ends of the light generating unit 4 and / or any surface of the reflecting surface of the reflecting plate 2 is coated, covered, or pasted with a metal that can isolate electromagnetic interference (Figure (Not shown). This can eliminate possible electromagnetic interference. Examples of metals that can isolate electromagnetic interference include copper (Cu), nickel (Ni), aluminum (A1), or a combination thereof. In addition, in the backlight module for a liquid crystal display device of the present invention, the number of the light generating units may be two or more, and in addition to the two sides of the light plate, grooves may be formed at corresponding positions to set the light. Pixels are generated, and the number of light generating units depends on the intended use or design. Generally, two light generating units are provided at two ends of the backlight module.

FIG. 5 is an enlarged schematic view of the fitting operation of the fitting member 41 provided in the light generating unit 4 in FIG. 2 and the supporting member 31 provided in the groove of the light guide plate 3.

FIG. 8 is a cross-sectional view of the backlight module for a liquid crystal display device of the present invention shown in FIG. 2, which is formed along the cross-section lines connected by the support elements 31 on the left and right sides. In this embodiment, a reflector is used to directly extend a predetermined length and bend the light generating unit to cover the light generating unit to generate a lampshade effect. As mentioned above, the reflecting plate with the lampshade function can also be made into an L-shaped upper cover. The L-shaped upper cover is covered with the reflecting plate under the light guide plate to reduce the light-generating unit during use. The generated heat affects elements such as reflectors. Both ends of the lower reflecting plate can be bent slightly upward to overlap with the L-shaped upper cover to avoid light leakage, and reduce the problem of wrinkling of the reflecting plate caused by the change in ambient temperature caused by the heat of the light generating unit.

Finally see Figure 3. FIG. 3 is a schematic diagram of another embodiment of a backlight module for a liquid crystal display device according to the present invention. The backlight module for a liquid crystal display device of the present invention includes a supporting frame 1 for supporting each component, a reflecting plate 2 for reflecting a light source to the light plate 3, and 2 for guiding the light generated by the light generating unit 4 to a display panel. A light guide plate 3, a light generating unit 4 that generates light, and one or more optical films ^ 5. Supporting frames 32 for supporting the light generating unit 4 are provided on both sides of the light guide plate 3, and supporting elements 31 are provided on the supporting frame 32. There are fitting elements 41 at each end of the light generating unit 4 for communicating with The support element 31 on the guide frame 32 is fitted. Moreover, a wire 44 is provided on the fitting element 41 for electrical connection with other units. In addition, the reflective plate 2 extends a predetermined length on both sides and is bent upward, and then an L-shaped cover 6 is used to cover the light generating unit 4. The L-shaped upper cover 6 can be fixed by means of an adhesive or an engaging element. For example, the engaging element 61 in FIG. 6 and the engaging element 33 provided on the light guide plate 3 Ji are engaged with each other to be fixed, thereby generating the function of a lampshade. In this embodiment, the engaging elements used may be a convex point and a concave point for engaging with each other.

Wherein, the surface of the fitting element 41 provided at both ends of the light generating unit 4 and / or any surface of the reflecting surface of the reflecting plate 2 is coated, covered or pasted with a metal that can isolate electromagnetic interference (Figure (Not shown). This can eliminate possible electromagnetic interference. Metals that can isolate electromagnetic interference can be used, such as: copper (Cu), hafnium (Ni), Aluminum (Al) or a combination thereof. In addition, in the backlight module for a liquid crystal display device of the present invention, the number of the light generating units may be one or more, depending on the purpose for which it is designed or used. But generally it is a light generating unit, which is arranged at two ends of the backlight module.

FIG. 6 is a partial schematic view showing the fitting operation of the fitting element 41 provided in the light generating unit 4 in FIG. 3 and the supporting element 31 on the support frame 32 provided on the side of the guide plate 3. In the above second embodiment, the light generating unit is disposed in the light guide plate, and includes forming a groove on a side of the light guide plate where the light generating unit is to be disposed to accommodate the;) ¾ generating unit, and in the groove The two ends of the inner part are provided with fixing holes corresponding to the fitting elements (also known as silicone sleeves) provided at both ends of the light generating unit to fix the light generating unit, and one or more protrusions are provided in the groove as appropriate. The dots are used to further fix the light generating unit, and the function of the bumps is similar to that of the O-ring provided by the lamp tube in the existing lamp module. When the light-generating unit used is provided with a 0-ring, it is not necessary to provide the protrusion ^. In the above-mentioned three embodiments, the two sides of the reflecting plate may be bent in a curved shape in addition to the case of being bent at a right angle as described above. The light generating unit ¾r is located inside the curved upward side of the reflecting plate or in the groove of the light guide plate. The supporting frame provided with the supporting element of the present invention can be integrally formed by injection molding, so the manufacturing is relatively simple. In order to bend the reflecting plate, a sewing line may be provided at the place where the reflecting plate is to be bent to facilitate the bending.

In addition, according to the backlight module for a liquid crystal display device of the present invention, the reflective plate used is generally made of polyethylene terephthalate (PET) and a material that reflects light on the reflective surface, such as titanium dioxide, is white reflective Layer can also be coated with metal. The reflective light material coated on the reflecting plate is preferably titanium dioxide, which can avoid the phenomenon of chromaticity shift of the light generating unit caused by absorption of a visible light wavelength.

In the backlight module for a liquid crystal display device of the present invention, the optical film used is Optical films commonly used in liquid crystal displays include, for example, diffusion films, light-collecting films, light-enhancing films, and prism films.

Claims

Claim

1. A backlight module for a liquid crystal display device, comprising: a supporting frame having a supporting element thereon;

At least one light generating unit is provided with a fitting element on each end thereof; a reflecting plate is disposed on the supporting frame, and both sides of the reflecting plate are bent upward, and the at least one light generating unit is The generated light is reflected upward; and

A light guide plate disposed on the reflection plate and configured to guide the light generated by the at least one light generating unit to a liquid crystal display panel;

A metal capable of isolating electromagnetic interference is disposed on a surface of the reflection plate, a surface of the fitting element, or a combination thereof.

2. The backlight module for a liquid crystal display device according to claim 1, wherein the fitting element is fitted with the supporting element on the supporting frame, so that the at least one light generating unit is fixed to the supporting element. On the support element that supports the frame.

3. The backlight module for a liquid crystal display device according to claim 2, wherein the material of the fitting element is silicone.

4. The backlight module for a liquid crystal display device according to claim 1, wherein the metal capable of isolating electromagnetic interference is copper, nickel, aluminum, or a combination thereof.

5. The backlight module for a liquid crystal display device according to claim 1, wherein the reflecting plate covers the light generating unit in a manner of being divided into two elements.

6. The backlight module for a liquid crystal display device according to claim 5, wherein The reflecting plate is composed of an upper cover group and a reflecting lower plate.

7. The backlight module for a liquid crystal display device according to claim 6, wherein the upper cover group is composed of an L-shaped upper cover.

8. The backlight module for a liquid crystal display device according to claim 6, wherein the reflective lower plate has a shape in which both ends are bent upward.

9. A backlight module for a liquid crystal display device, comprising:

A supporting framework;

A reflecting plate disposed on the supporting frame, and both sides of the reflecting plate are bent upwards;

A light guide plate disposed on the reflection plate, a groove on each side of the light guide plate, and a support element in the groove; and

At least one light generating unit is disposed in the groove of the light guide plate, the reflecting plate reflects the light generated by the at least one light generating unit upward, and the light guide plate reflects the at least one The light generated by the light generating unit is guided to a liquid crystal display panel, and two ends of the at least one light generating unit are respectively provided with a fitting element;

10. The backlight module for a liquid crystal display device according to claim 9, wherein the fitting element is fitted with the support element on the groove of the light guide plate to generate the at least one light The unit is fixed on the support element of the light guide plate.

11. The backlight module for a liquid crystal display device according to claim 9, wherein a material of the fitting element is silicone.

12. The backlight module for a liquid crystal display device according to claim 9, wherein the metal is copper, nickel, aluminum, or a combination thereof.

13. The backlight module for a liquid crystal display device according to claim 9, wherein the reflecting plate is composed of an upper cover group and a reflecting lower plate.

14. The backlight module for a liquid crystal display device according to claim 13, wherein the reflective lower plate has a shape in which both ends are bent upward.

15. The backlight module for a liquid crystal display device according to claim 13, wherein the upper cover group is composed of an L-shaped upper cover.

16. —A backlight module for a liquid crystal display device, comprising: a supporting frame;

At least one light generating unit is provided with a fitting element on each end thereof; a reflecting plate is disposed between the at least one light generating unit and the supporting frame, and both sides of the reflecting plate are bent upward, and Reflecting upward the light generated by the at least one light generating unit; and a light guide plate disposed on the reflective plate to guide the light generated by the at least one light generating unit to a liquid crystal A display panel, and a support element is provided on the light guide plate, and the support element is fitted with the fitting element of the at least one light generating unit, so that the at least one light generating unit is fixed to the supporting frame On the support element;

Wherein, a metal capable of isolating electromagnetic interference is disposed on a surface of the reflecting plate, On the surface of the fitting element or a combination thereof

17. The backlight module for a liquid crystal display device according to claim 16, wherein the material of the fitting element is silicone.

18. The backlight module for a liquid crystal display device according to claim 16, wherein the metal is copper, nickel, aluminum, or a combination thereof.

19. The backlight module for a liquid crystal display device according to claim 16, wherein the reflecting plate is composed of an upper cover group and a reflecting lower plate.

20. The backlight module for a liquid crystal display device according to claim 19, wherein the reflective lower plate has a shape in which both ends are bent upward.

21. The backlight module for a liquid crystal display device according to claim 19, wherein the upper cover group is composed of an L-shaped upper cover.