TW201413349A - Liquid crystal display device and direct type backlight module thereof - Google Patents

Abstract

The present invention provides a liquid crystal display device, which comprises a base, a diffusion plate, a plurality of light sources and a reflector unit. The base comprises a base wall with a first surface and a surrounding wall extended from the first surface of the base wall, wherein the base wall and the surrounding wall together define an accommodation space. The diffusion plate and the base wall are separately arranged in the accommodation space. The plurality of light sources are configured on the first surface of the base wall in an arrangement with intervals, and located between the base wall and the diffusion plate. The reflector unit is configured within the accommodation space of the base, and comprises a first reflector having a first surface adjacent to the first surface of the base wall for which the light sources may be penetrated and a first reflection surface facing toward the diffusion plate; and, a plurality of second reflectors configured on the first reflection surface of the first reflector and arranged among the light sources.

Description

Liquid crystal display device and direct type backlight module thereof

The invention relates to a backlight module, in particular to a direct type backlight module of a liquid crystal display device.

In recent years, liquid crystal televisions have been widely used in daily life because of their advantages of low radiation, light weight, short size, and low power consumption. However, since the liquid crystal display panel itself does not have the characteristics of light emission, it is necessary to achieve the function of displaying the screen of the liquid crystal television through the combination of the backlight module and the liquid crystal display panel.

With the size and construction of LCD TVs, backlight modules also have two main architectures. One of the main applications for large-size LCD TVs is a direct-lit backlight module, which is located behind the liquid crystal display panel. The light source that passes through the direct-lit backlight module is directly illuminated by the rear-facing liquid crystal display panel, so that the liquid crystal display panel has a higher Brightness.

Since the light-emitting diode also has low power consumption and small volume, it has become a trend of using a light source for a direct-lit backlight module. However, if the number of light-emitting diodes of the direct-lit backlight module is too large, the liquid crystal television cannot meet the requirements of further thinning. If the number of light-emitting diodes is too small, mura will occur due to uneven brightness of the screen.

Therefore, it is necessary to develop a direct-lit backlight module that can take into consideration the thin design of the LCD TV and the uniform brightness of the screen.

Therefore, the object of the present invention is to provide a direct type backlight module .

Therefore, the direct type backlight module of the present invention comprises a base, a diffusion plate, a plurality of light sources and a reflector group. The base includes a base wall having a first surface and a surrounding wall extending from the first surface of the base wall. The base wall cooperates with the surrounding wall to define an accommodation space. The diffusion plate is disposed in the accommodating space at a distance from the base wall. A plurality of light sources are arranged at intervals on the first surface of the base wall and between the base wall and the diffuser plate. The reflector member is disposed in the accommodating space of the pedestal, and includes a first surface adjacent to the base wall and the light source is disposed therebetween and has a first reflection of the first reflective surface of the diffusion plate And a plurality of second reflecting members disposed on the first reflecting surface of the first reflecting member and arranged between the light sources.

Preferably, the second reflecting members of the reflector group are arranged in a grid between the light sources.

More preferably, the second reflecting members are integrally formed.

More preferably, the longitudinal section of each of the second reflecting members is in a triangular shape with the portion of the first reflecting member located under the corresponding second reflecting member.

More preferably, each of the second reflecting members has a first side wall and a second side wall connected to the first side wall, and the first side wall and the second side wall respectively have a light source facing the one of the light sources and are rough Outer wall surface.

More preferably, each of the first side walls is disposed at an angle with the second side wall connected to the first side wall, and the incident light angle of each of the point light sources is incident on the adjacent first side wall and the second side wall. Degree to 70 degrees.

Preferably, the direct type backlight module further includes a plurality of support members spaced apart from the first reflective member, each support member having a contact for the diffusion The support table of the board, the first reflecting member has a plurality of perforations for each of the pair of supporting members to extend.

More preferably, each support member further has four connecting plates respectively connected to the supporting table, and each connecting plate faces the adjacent light source respectively.

More preferably, each support member is located at a point of intersection of a pair of adjacent four light sources.

More preferably, the diffusing plate has a light transmissive layer and an ink layer formed on the light transmissive layer, the ink layer having a plurality of ink particles arranged in a concentric circle.

More preferably, the ink particles of the ink layer are arranged in a first concentric circle and a second concentric circle surrounding the first concentric circle, and the arrangement density of the ink particles in the first concentric circle is not equal to The arrangement density of the second concentric circles.

More preferably, the center of the first concentric circle corresponds to one of the light sources, and the arrangement density of the ink particles in the first concentric circle is smaller than the arrangement density of the second concentric circles.

Another object of the present invention is to provide a liquid crystal display device.

The liquid crystal display device of the present invention comprises a backlight module and a display panel.

The direct type backlight module comprises a base, a diffusion plate, a plurality of light sources and a reflector group. The base includes a base wall having a first surface and a surrounding wall extending from the first surface of the base wall. The base wall cooperates with the surrounding wall to define an accommodation space. The diffusion plate is disposed in the accommodating space at a distance from the base wall. a plurality of light sources arranged at intervals in the first table of the base wall And located between the base wall and the diffuser. The reflector member is disposed in the accommodating space of the pedestal, and includes a first surface adjacent to the base wall and the light source is disposed therebetween and has a first reflection of the first reflective surface of the diffusion plate And a plurality of second reflecting members disposed on the first reflecting surface of the first reflecting member and arranged between the light sources. The display panel is stacked on the direct type backlight module, and receives the light of the direct type backlight module to be illuminated.

The invention has the effect of uniformly reflecting the light of the plurality of light sources to the diffusing plate through the reflector group, thereby reducing the number of the light source used, achieving a thinned design, and reducing the central brightness of the light source by using the pattern design of the diffusing plate, and borrowing The diffusion plate is supported by the support member to eliminate the dark streaks of the display panel, thereby improving the uniformity of light transmission of the display panel.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to FIG. 1 and FIG. 2 , a preferred embodiment of the liquid crystal display device 100 of the present invention comprises a backlight module 1 and a display panel 2 stacked on the direct backlight module 1 . The direct type backlight module 1 includes a base 11 , a diffuser plate 12 supported by the base 11 , and a plurality of light sources 13 and a reflector set 14 disposed between the base 11 and the diffuser plate 12 . The display panel 2 receives the incident light of the direct type backlight module 1 and displays an image.

Specifically, the display panel 2 includes a front frame 21, a substrate 22, and a liquid crystal layer 23 between the front frame 21 and the substrate 22. The liquid crystal layer 23 has a complex Several liquid crystal molecules. The substrate 22 has a plurality of transistors for controlling liquid crystal molecules to control the display state of the liquid crystal molecules. The display panel 2 of the present embodiment may be any prior art, and is not described herein, and the foregoing is not limited by the present invention.

The base 11 of the direct type backlight module 1 includes a base wall 111 and a surrounding wall 112 connecting the base walls 111. The base wall 111 has a first surface 113 that extends from the first surface 113 of the base wall 111 around the wall 112. The base wall 111 cooperates with the surrounding wall 112 to define an accommodating space 114.

Referring to FIG. 3 , the diffusion plate 12 has a light transmissive layer 121 adjacent to the light sources 13 and an ink layer 122 formed on the light transmissive layer 121 and away from the light sources 13 . The ink layer 122 has a plurality of ink particles arranged in concentric circles. In this embodiment, the ink particles of the ink layer 122 are formed by a plurality of first concentric circles 123 and a plurality of second concentric circles 124 surrounding the first concentric circles. The arrangement density of the ink particles in the first concentric circle is smaller than the arrangement density of the second concentric circles, and the arrangement density of the concentric circles is different to adjust the light transmittance of the diffusion plate 12. For example, the center of the ink layer 122 having a small ink particle arrangement density of the diffusion plate 12 corresponds to the light source 13, and the light of the light source 13 is refracted by several times. The ink layer 122 having a relatively high density can sufficiently scatter most of the light, so that the light that is totally transmitted is relatively uniform. Therefore, the center brightness of the light source 13 (light emitting diode) can be effectively reduced, the light transmission is more uniform, and the streaking phenomenon caused by uneven brightness is eliminated. Of course, the liquid crystal display device 100 of the present invention can also arrange various regular or irregular patterns through the ink particles to eliminate the light-dark boundary generated by the various light sources 13. The light sources 13 are disposed at intervals on the first surface 113 of the base wall 111 and on the base wall 111 and the diffusion plate 12 between. In this embodiment, each light source 13 is a point source type light source, preferably a light emitting diode.

The reflector group 14 is disposed in the accommodating space 114 of the susceptor 11 and includes a first reflective member 141 and a plurality of second reflective members 142. The first reflecting member 141 is disposed in parallel adjacent to the first surface 113 of the base wall 111, and has a receiving hole 143 through which the light sources 13 are disposed, and has a first reflecting surface 144 facing the diffusing plate 12. . The second reflecting members 142 are located on the first reflecting surface 144 of the first reflecting member 141 and arranged between the light sources 13 . Preferably, the second reflecting members 142 are arranged in a grid between the light sources 13.

Referring to FIG. 2, FIG. 4 and FIG. 5, each second reflective member 142 has a first sidewall 145 and a second sidewall 146 connected to the first sidewall 145. The second sidewall 146 of each of the first sidewalls 145 and the portion of the first reflector 141 under the corresponding first sidewall 145 and the second sidewall 146 cooperate to form a triangle. That is, the longitudinal section of each of the second reflecting members 142 and the portion of the first reflecting members 141 located under the corresponding second reflecting members 142 cooperate with each other to form a triangle. Preferably, the first side wall 145 and the second side wall 146 respectively have a corresponding outer light source 13 and a rough outer wall surface to enhance scattering. Each of the first sidewalls 145 is disposed at an angle to the second sidewall 146 of each of the first sidewalls 145 for causing the light of each of the light sources 13 to be incident on the adjacent first sidewall 145 and the second sidewall 146. The angle of incidence is mainly between 30 and 70 degrees.

It is further stated that the second reflecting members 142 may be integrally formed, or may be plastic injection molding and sputter reflective materials, or The reflective sheet is directly formed by a metal mold. The second reflecting member 142 may also be formed by separately attaching or inserting the longitudinally extending portion and the laterally extending portion. The design advantage of the second reflecting member 142 in this embodiment is that for the liquid crystal display device 100 of a specific size, if the second reflecting member 142 is integrally formed, the cost of manufacturing can be effectively reduced.

Another variation of this embodiment is shown in FIG. 6. The second reflection members 142 of the reflector group of the liquid crystal display device 100 are arranged in a row or arranged in a row as shown in FIG. 7, and the light source 13 can be uniformly scattered. . Each of the second reflectors 142 can be flexibly combined and assembled.

Since the first reflecting member 141 and the second reflecting member 142 each have a specific normal direction, when the light of the light source 13 is irradiated in all directions, the first reflecting member 141 and the second reflecting member 142 of the reflecting member group 14 are respectively formed. After various incident angles, it is reflected into the diffusion plate 12. In this way, the light source 13 can be uniformly irradiated into the diffusing plate 12 through the reflector group 14 , which not only can effectively reduce the number of the light sources 13 to reduce the manufacturing cost of the liquid crystal display device 100 , but also achieve the thinness of the liquid crystal display device 100 . Design.

Referring to FIG. 2, FIG. 5 and FIG. 8, the direct type backlight module 1 further includes a plurality of support members 15 arranged at intervals in the first reflection member 141. Each support member 15 is located at a point intersection of a pair of adjacent light sources 13. Each support member 15 has a support base 151 and four connecting plates 152 which are respectively connected to the support base 151 and are transparent. The support table 151 is slightly curved and is used to contact the diffusion plate 12. The support table 151 can be made of a transparent material such as polycarbonate. Each connecting plate 152 faces adjacent light Source 13. The first reflecting member 141 has a plurality of through holes 147 for respectively extending one of the corresponding supporting members 15, and the supporting member 15 is positioned on the first reflecting member 141. In this way, the support member 15 can avoid blocking the cross dark lines generated by the four light sources 13, and reduce the light and dark contrast and dark lines generated by the support member 15 against the diffuser plate 1 to make the optical taste more uniform.

In summary, the liquid crystal display device 100 of the present invention supports and touches the diffusion plate 12 by using a plurality of supports 15 disposed on the reflector group 14 to reduce cross-dark lines of the display screen. The liquid crystal display device 100 further reflects the light of the point light source 13 through the reflector group 14, and then uniformly incidents on the diffusion plate 12 and projects it into the display panel 2 to improve the overall brightness of the display screen and transmit the ink through the diffusion plate 12. The pattern design of layer 122 reduces the center brightness of light source 13 to make the brightness of the display picture more uniform. In the case where the number of the light sources 13 is reduced, the present invention can effectively reduce the streaking phenomenon caused by uneven brightness, and at the same time, the liquid crystal display device 100 can be designed to be more thinned, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100‧‧‧Liquid crystal display device

1‧‧‧Direct type backlight module

11‧‧‧Base

111‧‧‧ base wall

112‧‧‧ Around the wall

113‧‧‧ first surface

114‧‧‧ accommodating space

12‧‧‧Diffuser

121‧‧‧Transparent layer

122‧‧‧Ink layer

123‧‧‧First Concentric Circle

124‧‧‧Second concentric circle

13‧‧‧Light source

14‧‧‧reflector group

141‧‧‧First reflector

142‧‧‧second reflector

143‧‧‧ accommodating holes

144‧‧‧First reflecting surface

145‧‧‧First side wall

146‧‧‧ second side wall

15‧‧‧Support

151‧‧‧Support table

152‧‧‧Connecting plate

2‧‧‧ display panel

21‧‧‧ front box

22‧‧‧Substrate

23‧‧‧Liquid layer

1 is a side elevational view showing a preferred embodiment of a liquid crystal display device of the present invention; and FIG. 2 is an exploded perspective view showing the design of the liquid crystal display device of the present embodiment; 3 is a top plan view showing the design of the diffusing plate of the embodiment; FIG. 4 is a partial plan view showing the design of the reflecting member set of the embodiment; FIG. 5 is a partial side view showing the design of the reflecting member set of the embodiment. 6 to 7 are partial plan views showing the design of the reflector member set of the present embodiment; and Fig. 8 is a perspective view showing the design of the support member of the embodiment.

100‧‧‧Liquid crystal display device

1‧‧‧Direct type backlight module

11‧‧‧Base

111‧‧‧ base wall

112‧‧‧ Around the wall

113‧‧‧ first surface

114‧‧‧ accommodating space

12‧‧‧Diffuser

13‧‧‧Light source

14‧‧‧reflector group

143‧‧‧ accommodating holes

2‧‧‧ display panel

21‧‧‧ front box

22‧‧‧Substrate

23‧‧‧Liquid layer

Claims (24)

A direct type backlight module includes: a base comprising a base wall having a first surface and a surrounding wall extending from the first surface of the base wall, the base wall and the surrounding wall defining an accommodation a diffusing plate disposed at a distance from the base wall in the accommodating space; a plurality of light sources disposed at intervals on the first surface of the base wall and located between the base wall and the diffusing plate; a reflector member disposed in the accommodating space of the pedestal, including a first surface adjacent to the base wall and having the light source interposed therebetween and having a first surface of the first reflective surface of the diffuser a reflecting member, and a plurality of second reflecting members disposed on the first reflecting surface of the first reflecting member and arranged between the light sources. The direct type backlight module of claim 1, wherein the second reflection members of the reflector group are arranged in a grid between the light sources. The direct type backlight module of claim 2, wherein the second reflection members are integrally formed. The direct-type backlight module of claim 2, wherein a longitudinal section of each of the second reflecting members is triangular with a portion of the first reflecting member located under the corresponding second reflecting member. The direct type backlight module of claim 2, wherein each of the second reflecting members has a first side wall and a second side wall connected to the first side wall, the first side wall and the first side wall Two side walls each have one Facing one of the light sources and having a rough outer wall surface. The direct type backlight module of claim 5, wherein each of the first side walls is disposed at an angle with the second side wall connected to the first side wall, and the light of each of the point light sources is incident on the adjacent side. The incident angle of the first sidewall and the second sidewall is 30 degrees to 70 degrees. The direct type backlight module of claim 1, further comprising a plurality of support members spaced apart from the first reflection member, each support member having a support table for contacting the diffusion plate, The first reflecting member has a plurality of perforations for each of the pair of supporting members to extend. The direct type backlight module of claim 7, wherein each support member further has four connecting plates respectively connected to the supporting table, and each connecting plate faces the adjacent light source. The direct type backlight module of claim 8, wherein each of the support members is located at a point of intersection of a pair of adjacent four light sources. The direct type backlight module of claim 1, wherein the diffusion plate has a light transmissive layer and an ink layer formed on the light transmissive layer, the ink layer having a plurality of concentric circles arranged Ink particles. The direct-lit backlight module of claim 10, wherein the ink particles of the ink layer are arranged in a first concentric circle and a second concentric circle surrounding the first concentric circle, The arrangement density of the ink particles in the first concentric circle is not equal to the arrangement density of the second concentric circles. The direct type backlight module according to claim 11 of the patent application scope, wherein The center of the first concentric circle corresponds to one of the light sources, and the arrangement density of the ink particles in the first concentric circle is smaller than the arrangement density of the second concentric circles. A liquid crystal display device comprising: a direct-lit backlight module, comprising: a base comprising a base wall having a first surface and a surrounding wall extending from the first surface of the base wall, the base wall and the base An accommodating space is defined around the wall, a diffusing plate is disposed in the accommodating space at a distance from the base wall, and a plurality of light sources are arranged at intervals on the first surface of the base wall, and the base wall is located at the base wall Between the diffusing plates, and a reflector member disposed in the accommodating space of the pedestal, including a first surface adjacent to the base wall and having the light source interposed therebetween and having a side of the diffusing plate a first reflecting member of the first reflecting surface, and a plurality of second reflecting members disposed on the first reflecting surface of the first reflecting member and arranged between the light sources, and a display panel stacked on the straight line The backlight module receives the light of the direct type backlight module and displays the light. The liquid crystal display device of claim 13, wherein the second reflection members of the reflector group are arranged in a grid between the light sources. The liquid crystal display device of claim 14, wherein the second reflecting members are integrally formed. The liquid crystal display device of claim 14, wherein a longitudinal section of each of the second reflecting members is triangular with a portion of the first reflecting member located under the corresponding second reflecting member. The liquid crystal display device of claim 14, wherein each of the second reflective members has a first sidewall and a second sidewall connected to the first sidewall, the first sidewall and the second sidewall Each has a rough outer wall facing one of the light sources. The liquid crystal display device of claim 17, wherein each of the first sidewalls is at an angle to the second sidewall connected to the first sidewall, and the light of each of the point sources is incident on the adjacent one The incident angle of a side wall and the second side wall is 30 degrees to 70 degrees. The liquid crystal display device of claim 13, wherein the direct type backlight module further has a plurality of support members spaced apart from the first reflective member, each support member having a contact for the diffusion The support table of the board, the first reflecting member has a plurality of perforations for each of the pair of supporting members to extend. The liquid crystal display device of claim 19, wherein each support member further has four connection plates respectively connected to the support table, each of the connection plates facing the adjacent light source. The liquid crystal display device of claim 20, wherein each support member is located at a point of intersection of a pair of adjacent four light sources. The liquid crystal display device of claim 13, wherein the diffusion plate has a light transmissive layer and an ink layer formed on the light transmissive layer, the ink layer having a plurality of ink particles arranged in a concentric circle . The liquid crystal display device of claim 22, wherein the ink particles of the ink layer have a first concentric circle and a second concentric circle surrounding the first concentric circle, the ink particles The arrangement density of the first concentric circles is not equal to the arrangement density of the second concentric circles. The liquid crystal display device of claim 23, wherein a center of the first concentric circle corresponds to one of the light sources, and the arrangement density of the ink particles in the first concentric circle is smaller than the second concentric circle Arrange density.