TWI407201B - A backlight module of the display - Google Patents

Abstract

The present invention provides a backlight module of the display. The backlight module, which comprises at least a light source device, a housing, a light guide plate, a plurality of fastening means and a plurality of light shielding elements. The housing includes a base. The light guide plate having an upper surface, a lower surface and a lateral surface, comprises a plurality of openings. The light guide plate is provided as its lower surface towards the housing. The plurality of fastening means are provided on the base of the housing and through the openings of the light guide plate. The plurality of light shielding elements which provided at the openings have the light transmittance less than 50%.

Description

Display backlight module

The present invention relates to a backlight module, and more particularly to a backlight module for a liquid crystal display used in a flat panel display.

In recent years, with the maturity of optoelectronic technology and semiconductor manufacturing technology, Flat Panel Display has flourished. Liquid crystal display (LCD) is based on its low voltage operation, no radiation scattering, light weight and volume. Small advantages, etc., have gradually replaced the traditional cathode ray tube display and become the mainstream of display products in recent years. The liquid crystal display mainly includes a liquid crystal display panel (LCD) and a backlight module, wherein the backlight module is used to provide a surface light source required for the liquid crystal display panel, and the light guide plate (Light Guide) Plate) is a key component for providing a sufficient light source for liquid crystal displays in backlight modules.

In general, the backlight module can be divided into two types: an edge light type and a direct type. The light source of the edge light type backlight module is disposed on the side of the light guide plate to provide a light source required for the liquid crystal display. Please refer to FIG. 1 , which is a schematic diagram of a light guide plate 9 in a conventional edge-lit backlight module. The light guide plate 9 includes a plurality of recessed positions 91 and a plurality of support columns 92 extending from the back plate through the recessed position 91 . . The support post 92 mainly fixes the light guide plate 9 and other back plates, reflection sheets, optical films, and the like in the backlight module. The light emitted from the light source 8 is incident on the light guide plate 9, wherein the area of the portion A is the visible area A of the display quality, but the light that the light source 8 enters the light guide plate 9 will partially leak out from the concave portion position 91, resulting in a The light leakage phenomenon, as shown by B in FIG. 1 , causes a phenomenon in which the brightness of the display screen is uneven (Mura), and further reduces the optical taste of the visible area of the display quality.

The reason is that it is necessary to provide a backlight module capable of providing uniform brightness to solve the aforementioned problems, and to prevent local light from leaking out into the visible area and reducing the display quality of the display.

In order to solve the above-mentioned prior art, the present invention provides a backlight module for a display. The backlight module mainly includes at least one light source device, a housing, a light guide plate, a plurality of fixed structures, and a plurality of light shielding elements. The housing includes a bottom plate. The light guide plate has an upper surface, a lower surface and a side surface, the edge of which has a plurality of openings, and the lower surface faces the housing. The plurality of fixing structures are protruded from the bottom plate, and correspond to the opening portions of the light guide plate and penetrate into the opening portion of the light guide plate. The plurality of shading elements have a light transmittance of less than 50% and are provided in the opening of the light guide plate.

Therefore, the main purpose of the present invention is to provide a backlight module for a display, wherein the backlight module includes at least one light guide plate, and a plurality of light shielding elements are disposed on the opening portion of the light guide plate to prevent light leakage from occurring. The light uniformity, which in turn enhances the optical quality of the display quality.

Since the present invention discloses a backlight module for a display, the optical principle and basic architecture utilized therein are well known to those skilled in the relevant art, and therefore, the description below will not be fully described. At the same time, the drawings in the following texts express the structural schematics related to the features of the present invention, and do not need to be completely drawn according to the actual size, which is described first.

Referring to FIG. 2, a first preferred embodiment of the present invention is a backlight module 10 for a display, which mainly includes at least one light source device 1, a housing 2, a light guide plate 4, and a plurality of fixed structures 5 And a plurality of shading elements 45. The housing 2 includes a bottom plate 3. The light guide plate 4 has an upper surface 41, a lower surface 42, and a side surface 43. Referring to FIG. 3, a plurality of openings 44 are formed at the edge of the light guide plate 4. Referring to FIG. 2, the light guide plate 4 is disposed on the bottom plate 3 from the lower surface 42 toward the casing 2. The plurality of fixing structures 5 are protruded from the bottom plate 3 and correspond to the opening portion 44 of the light guide plate 4 and penetrate the opening portion 44 of the light guide plate 4, thereby fixing the light guide plate 4 and the bottom plate 3. In addition, in order to increase the utilization of light, at least one reflective sheet 7 may be further disposed on the lower surface 42 of the light guide plate 4. Therefore, the plurality of fixing structures 5 may further fix the light guide plate 4, the reflection sheet 7, and the bottom plate 3. The light source device 1 may be a Cold Cathode Fluorescent Lamp (CCFL) or a Light Emitting Diode (LED) array, and may be disposed on the side of the light guide plate 4.

In addition, it is specifically noted that the plurality of fixing structures 5 of the present invention may be protruded from the bottom plate 3 and may be protruded from the casing 2, but not limited thereto. It can be extended to the opening portion 44 of the light guide plate 4, thereby achieving the holding of the light guide plate 4, and should belong to the fixed structure 5 of the present invention and its application.

Referring to FIG. 3, it is important that the opening portion 44 of the light guide plate 4 is provided with a plurality of light shielding elements 45 having a light transmittance of less than 50% in order to prevent light leakage. Further, the light shielding area of the light shielding elements 45 is not smaller than the area of the opening portion 44, and particularly preferably larger than the area of the opening portion 44. It should be particularly noted that the material of the light shielding member 45 may be an elastic cushioning material such as a tape or a foam to support the expansion of the light guide plate due to heat. The light shielding member 45 may also be a material having a light transmittance of less than 50% at a wavelength of 555 nm, preferably a material having a light transmittance of less than 25% at a wavelength of 555 nm, which can effectively shield the opening portion 44, thereby preventing The light incident on the light guide plate 4 by the light source device 1 partially leaks unevenly from the opening portion 44, and the optical taste of the display quality can be improved. Of course, the material of the above-mentioned light shielding member 45 can be used according to actual production requirements.

Further, the plurality of the light shielding elements 45 described above may be formed on the opening portion 44 of the upper surface 41 of the light guide plate 4 by attaching, printing, setting, or printing.

Referring to FIG. 4A, the present invention further provides a second preferred embodiment, which is a backlight module 10 of another display. The biggest difference between this embodiment and the foregoing first preferred embodiment is that the plurality of shading elements 45 of the embodiment can be formed on the optical film group 6 adjacent to the light guide plate 4 by attaching, printing, setting, or printing. The other features of the backlight module 10 of the display in this embodiment are as described in the foregoing first preferred embodiment.

Referring to FIG. 4B, the present invention further provides a third preferred embodiment, which is a backlight module 10 of another display. The biggest difference between this embodiment and the foregoing first preferred embodiment is that the implementation The plurality of light-shielding elements 45 can be formed between the plurality of optical films 61 by attaching, printing, setting or printing. The other features of the backlight module 10 of the display in this embodiment are as follows. The foregoing first preferred embodiment is described.

Referring to FIG. 4C, the present invention further provides a fourth preferred embodiment, which is a backlight module 10 of another display. The biggest difference between this embodiment and the foregoing first preferred embodiment is that the plurality of shading elements 45 of the embodiment can be formed on the optical film group 6 away from the light guide plate 4 by attaching, printing, setting, or printing. The other features of the backlight module 10 of the display in this embodiment are as described in the foregoing first preferred embodiment.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the patent application rights of the present invention. The above description should be understood and implemented by those skilled in the art, so that the other embodiments are not deviated from the present invention. Equivalent changes or modifications made in the spirit of the disclosure should be included in the scope of the patent application.

9‧‧‧Light guide plate (prior art)

91‧‧‧ recess position (prior art)

92‧‧‧Support column (prior art)

8‧‧‧Light source (prior art)

A‧‧‧visible area (prior art)

E‧‧‧Light leakage (prior art)

10‧‧‧Backlight module

1‧‧‧Light source device

2‧‧‧Shell

3‧‧‧floor

4‧‧‧Light guide plate

41‧‧‧ upper surface

42‧‧‧ lower surface

43‧‧‧ side surface

44‧‧‧ openings

45‧‧‧Shading elements

5‧‧‧Fixed structure

6‧‧‧Optical diaphragm group

61‧‧‧Optical diaphragm

7‧‧‧reflector

FIG. 1 is a schematic view showing a prior art of a light guide plate in an edge-lit backlight module.

2 is a cross-sectional view showing a schematic structural view of a cross section of a backlight module according to a first preferred embodiment of the present invention.

Figure 3 is a schematic view of a light guide plate having a plurality of light-shielding elements in accordance with a first preferred embodiment of the present invention.

Figure 4A is a schematic view of a second preferred embodiment of the present invention in which a plurality of shading elements are adjacent to the surface of the light guide plate.

Figure 4B is a schematic illustration of a plurality of light-shielding elements between a plurality of optical films in accordance with a third preferred embodiment of the present invention.

Figure 4C is a schematic view of a fourth preferred embodiment of the present invention in which a plurality of shading elements are remote from the surface of the light guide plate.

10. . . Backlight module

1. . . Light source device

2. . . case

3. . . Bottom plate

4. . . Light guide

41. . . Upper surface

42. . . lower surface

43. . . Side surface

44. . . Opening

45. . . Shading element

5. . . Fixed structure

6. . . Optical film set

61. . . Optical diaphragm

7. . . A reflective sheet

Claims (41)

A backlight module of a display, comprising: at least one light source device, which projects a light source to a light guide plate; a casing comprising a bottom plate; the light guide plate is disposed in the casing, the light guide plate has an upper surface, a lower And a surface of the light guide plate having a plurality of openings, the lower surface facing the housing; a plurality of fixing structures are disposed on the opening of the light guide plate; wherein the backlight module of the display comprises a plurality of Each of the light-shielding elements is disposed above each of the openings of the light guide plate, and the light-shielding elements are materials having a light transmittance of less than 50% with a wavelength of 555 nm. The backlight module of the display of claim 1, wherein a plurality of fixing structures are protruded from the bottom plate and correspondingly penetrated into the opening of the light guide plate. The backlight module of the display of claim 1, wherein the shading elements have a light-shielding area not less than the opening area. The backlight module of the display of claim 1, wherein the shading elements are an elastic buffer material. The backlight module of the display of claim 1, wherein the shading elements are a tape. The backlight module of the display of claim 1, wherein the shading elements are materials having a wavelength of 555 nm light transmittance of less than 25%. The backlight module of the display of claim 1, wherein the light shielding elements are disposed on the upper surface of the upper surface of the light guide plate by attaching, printing or printing. The backlight module of the display of claim 1, further comprising at least one optical film set disposed in the housing, wherein the plurality of fixing structures are adjacent to the upper surface of the light guide plate . The backlight module of the display of claim 1, wherein the light source device is a cold cathode fluorescent tube or a light emitting diode array. The backlight module of the display of claim 1, further comprising at least one reflective sheet disposed on a lower surface of the light guide plate. The backlight module of the display of claim 10, wherein the plurality of fixing structures are protruded from the reflective sheet and correspondingly penetrate through the opening of the light guide plate. A backlight module of a display, comprising: at least one light source device, which projects a light source to a light guide plate; a casing comprising a bottom plate; the light guide plate is disposed in the casing, the light guide plate has an upper surface, a lower a surface of the light guide plate having a plurality of openings, the lower surface facing the housing; a plurality of fixing structures disposed on the opening of the light guide plate; at least one optical film set disposed on the shell The backlight module of the display includes a plurality of shading elements, and the shading elements are respectively disposed adjacent to the optical module sheet group. The plurality of fixing structures are opposite to the upper surface of the light guide plate. The surface of the light guide plate, and the light shielding elements are materials having a wavelength of 555 nm light transmittance of less than 50%. The backlight module of the display of claim 12, wherein a plurality of fixing structures are protruded from the bottom plate and correspondingly penetrated into the opening of the light guide plate. The backlight module of the display of claim 12, wherein the light shielding area of the light shielding elements is not less than the opening area. The backlight module of the display of claim 12, wherein the shading elements are an elastic buffer material. The backlight module of the display of claim 12, wherein the shading elements are a tape. The backlight module of the display of claim 12, wherein the shading elements are materials having a wavelength of 555 nm light transmittance of less than 25%. The backlight module of the display of claim 12, wherein the light source device is It is a cold cathode fluorescent tube or a light emitting diode array. The backlight module of the display of claim 12, further comprising at least one reflective sheet disposed on a lower surface of the light guide plate. The backlight module of the display of claim 19, wherein the plurality of fixing structures are protruded from the reflective sheet and correspondingly penetrate through the opening of the light guide plate. The backlight module of the display of claim 12, wherein the light shielding elements are formed on the surface of the optical film group adjacent to the light guide plate by attaching, printing, setting or printing. A backlight module of a display, comprising: at least one light source device, which projects a light source to a light guide plate; a casing comprising a bottom plate; the light guide plate is disposed in the casing, the light guide plate has an upper surface, a lower a surface of the light guide plate having a plurality of openings, the lower surface facing the housing; a plurality of fixing structures disposed on the opening of the light guide plate; at least one optical film set disposed on the shell The backlight module of the display includes a plurality of shading elements, and the shading elements respectively set the optical module groups away from each other by the plurality of fixing structures being opposite to the upper surface of the light guide plate. The surface of the light guide plate, and the light shielding elements are materials having a wavelength of 555 nm light transmittance of less than 50%. The backlight module of the display of claim 22, wherein a plurality of fixing structures are protruded from the bottom plate and correspondingly penetrated into the opening of the light guide plate. The backlight module of the display of claim 22, wherein the light shielding area of the light shielding elements is not less than the opening area. The backlight module of the display of claim 22, wherein the shading elements are an elastic buffer material. The backlight module of the display of claim 22, wherein the shading elements It is a tape. The backlight module of the display of claim 22, wherein the shading elements are materials having a wavelength of 555 nm light transmittance of less than 25%. The backlight module of the display of claim 22, wherein the light source device is a cold cathode fluorescent tube or a light emitting diode array. The backlight module of the display of claim 22, further comprising at least one reflective sheet disposed on a lower surface of the light guide plate. The backlight module of the display of claim 29, wherein the plurality of fixing structures are protruded from the reflective sheet and correspondingly penetrate through the opening of the light guide plate. The backlight module of the display of claim 22, wherein the light shielding elements are formed on the surface of the optical film group away from the light guide plate by attaching, printing, setting or printing. A backlight module of a display, comprising: at least one light source device, which projects a light source to a light guide plate; a casing comprising a bottom plate; the light guide plate is disposed in the casing, the light guide plate has an upper surface, a lower a surface of the light guide plate having a plurality of openings, the lower surface facing the housing; a plurality of fixing structures disposed on the opening of the light guide plate; at least one optical film set disposed on the shell The backlight module of the display includes a plurality of shading elements, and the shading elements are respectively disposed on the optical module sheets. The plurality of fixing structures are opposite to the upper surface of the light guide plate. And the light-shielding elements are materials having a wavelength of 555 nm light transmittance of less than 50%. The backlight module of the display of claim 32, wherein a plurality of fixing structures are protruded from the bottom plate and correspondingly penetrated into the opening of the light guide plate. The backlight module of the display of claim 32, wherein the shading elements The shading area is not less than the opening area. The backlight module of the display of claim 32, wherein the shading elements are an elastic buffer material. The backlight module of the display of claim 32, wherein the shading elements are a tape. The backlight module of the display of claim 32, wherein the shading elements are materials having a wavelength of 555 nm light transmittance of less than 25%. The backlight module of the display of claim 32, wherein the shading elements are formed between the optical films by attaching, printing, setting or printing. The backlight module of the display of claim 32, wherein the light source device is a cold cathode fluorescent lamp tube or a light emitting diode array. The backlight module of the display of claim 32, further comprising at least one reflective sheet disposed on a lower surface of the light guide plate. The backlight module of the display of claim 40, wherein the plurality of fixing structures are protruded from the reflective sheet and correspondingly penetrate through the opening of the light guide plate.