TW201321852A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device includes a liquid crystal display panel, a first prism sheet, a first polarizer, a second polarizer and a backlight module. The first polarizer is disposed between the first prism sheet and the liquid crystal display panel, and the second polarizer is disposed at one side of the liquid crystal display panel which is opposite to the first polarizer. The backlight module is disposed at one side of the first prism sheet which is opposite to the first polarizer. A haze value of the first polarizer is less than twenty-five percent, and a angle between a first extension direction of the first prism sheet and a first transmission direction of the first polarizer ranges between zero and twenty degrees. Therefore, the liquid crystal display device can eliminate or improve the mura caused by the optical interference.

Description

Liquid crystal display device

The present invention relates to a display device, and more particularly to a liquid crystal display device.

The types of common display devices can be classified into a cathode ray tube display (CRT Display) and a flat display device. The flat display device includes a liquid crystal display device (LCD Device) and a plasma display device. Among them, the liquid crystal display device has become one of the mainstream in the market due to its advantages of high image quality, low power consumption, and no radiation.

Generally, a liquid crystal display device includes a liquid crystal panel, a first polarizer, a second polarizer, a first die, a second die, and a backlight module. The backlight module is configured to provide a surface light source required for the liquid crystal panel. The first polarizer and the second polarizer are respectively disposed on opposite sides of the liquid crystal panel, so that the liquid crystal display achieves the display effect. The first cymbal and the second cymbal disposed between the liquid crystal panel and the backlight module are used to enhance the brightness presentation of the liquid crystal display device.

It should be noted that since the liquid crystal display device is composed of a plurality of components, when the liquid crystal display device is assembled, the brightness of the display panel of the liquid crystal panel is uneven due to the deviation of the relative arrangement relationship between the plurality of components. The phenomenon (mura), in turn, affects the display quality of the liquid crystal display device. For example, when two adjacent light-transmissive films (ie, the first and second dies, the second and second diffusion plates or the first diffusion plate and the second diffusion plate) or the light-transmissive film and the polarizer When the mutual adsorption phenomenon occurs between the two adjacent light-transmissive films or the light-transmissive film and the polarizing film, the light is caused in the liquid crystal display device. After multiple reflections and refractions, optical interference such as Newton's Ring or rainbow pattern occurs, which in turn affects the display quality of the liquid crystal display device.

In addition, the structure or pattern of each component in the liquid crystal display device may also cause uneven brightness on the display region of the liquid crystal panel. For example, in a thin film transistor display (TFT-LCD), both a color filter and a prism are periodic geometric structures. When the effective periods of the two overlap, the liquid crystal panel is The display area generates an optical interference phenomenon, which in turn affects the display quality of the liquid crystal display device.

In view of this, the present invention proposes a liquid crystal display device whereby the phenomenon of luminance unevenness caused by optical interference in the prior art is eliminated or improved.

According to an embodiment of the liquid crystal display device of the present invention, the liquid crystal display device includes a liquid crystal panel, a first die, a first polarizer, a second polarizer, and a backlight module. The first polarizer is disposed on one side of the liquid crystal panel, the second polarizer is disposed on the other side of the liquid crystal panel relative to the first polarizer, and the first die is disposed on the first polarizer relative to the liquid crystal panel On the other side, the backlight module is disposed on the other side of the first die relative to the first polarizer. The first cymbal includes a plurality of first strips and has a first extending direction and a first arranging direction. Each of the first strips is arranged along the first array direction, and the first array direction and the first extending direction are perpendicular to each other. The first polarizer has a first penetration axis direction, and an angle between the first penetration axis direction and the first extension direction is θ, and 0° ≦ θ ≦ 20°. The first polarizer has a haze value of H ₁ and H ₁ ≦ 25%.

According to another embodiment of the liquid crystal display device of the present invention, the liquid crystal display device includes a liquid crystal panel, a first die, a first polarizer, a second polarizer, and a backlight module. The first polarizer is disposed between the first die and the liquid crystal panel, the second polarizer is disposed on the other side of the liquid crystal panel relative to the first polarizer, and the backlight module is disposed on the first die relative to the first The other side of a polarizer.

The first cymbal includes a plurality of first strips and has a first extending direction and a first arranging direction, and each of the first strips is arranged along the first array direction, the first array direction and the first An extension direction is perpendicular to each other. The first cymbal has a first refractive index n _M in the first alignment direction, and the first cymbal has a second refractive index n _N in the first extending direction, and 0.02 ≦ | n _{M -} n _N | ≦ 0.3. The first polarizer has a first penetration axis direction, and an angle between the first penetration axis direction and the first extension direction is θ, and 0° ≦ θ ≦ 20°.

According to the embodiment of the liquid crystal display device of the present invention, the polarized light having different polarization directions can be changed by the angle between the first transmission axis direction and the first extension direction being between zero and twenty degrees. The transmittance of the first polarizer further eliminates or improves the brightness unevenness caused by optical interference. In addition, according to the embodiment of the liquid crystal display device disclosed in the present invention, the range of the first refractive index and the second refractive index can be adjusted to avoid the occurrence of the photoelastic effect, thereby eliminating or improving the brightness unevenness of the liquid crystal display device. The phenomenon. Furthermore, according to the embodiment of the liquid crystal display device disclosed in the present invention, it is not necessary to use the high haze value of the first polarizer sheet (ie, H ₁ >25%) to eliminate or improve the phenomenon that the liquid crystal display device generates brightness unevenness.

The above description of the present invention and the following description of the embodiments are intended to illustrate and explain the spirit and principles of the invention, and to provide a further explanation of the scope of the invention.

Please refer to FIG. 1A and FIG. 1B for an exploded perspective view of an embodiment of a liquid crystal display device according to the present invention and an assembled side view of a liquid crystal display device according to FIG. 1A. The liquid crystal display device 100 can include a liquid crystal panel 102 , a first die 104 , a first polarizer 106 , a second polarizer 108 , a backlight module 110 , and a diffusion sheet 112 . The first polarizer 106 is disposed between the first die 104 and the liquid crystal panel 102, the second polarizer 108 is disposed on the other side of the liquid crystal panel 102 with respect to the first polarizer 106, and the backlight module 110 is disposed on The first die 104 is disposed on the other side of the first polarizer 106 , and the diffuser 112 is disposed between the backlight module 110 and the first die 104 .

In other words, the first polarizer 106 is disposed on one side of the liquid crystal panel 102, the second polarizer 108 is disposed on the other side of the liquid crystal panel 102 with respect to the first polarizer 106, and the first die 104 is disposed on the other side. The first polarizer 106 is disposed on the other side of the liquid crystal panel 102, the backlight module 110 is disposed on the other side of the first die 104 relative to the first polarizer 106, and the diffuser 112 is disposed on the backlight module 110. Between the first cymbals 104. There is only an air layer 105 interposed between the first cymbal 104 and the first polarizer 106.

In this embodiment, the backlight module 110 includes a light source 50 and a light guide plate 60. The light source 50 is used to provide light. The light guide plate 60 is used to convert the light provided by the light source 50 into a surface light source, and the backlight module 110 can be It is not limited to a side-lit backlight module. For example, the backlight module 110 can also be a direct type backlight module.

Please refer to "Fig. 2", which is a schematic diagram of the three-dimensional structure of the first cymbal and the first polarizer according to "1A". The first cymbal 104 includes a plurality of first strips 70 and has a first extending direction N and a first array direction M. Each of the first strips 70 is arranged along the first array direction M, and the first array direction M and the first extending direction N are perpendicular to each other. The first polarizer 106 has a first penetration axis direction Q, and an angle between the first penetration axis direction Q and the first projection direction F is θ, and 0° ≦ θ ≦ 20°. The first transmission axis direction Q and the first projection direction F are located on the same plane of the first polarization plate 106. The first projection direction F is parallel to the first extension direction N, so the angle between the first transmission axis direction Q and the first extension direction N is also between zero and twenty degrees.

In more detail, since the natural light can be composed of the first direction polarized light and the second direction polarized light which are independent from each other, the first direction polarized light and the second direction polarized light have different transmittance and reflectance for the same substance. The polarization direction of the first direction polarized light and the second direction polarized light are perpendicular to each other. Therefore, when the natural light emitted by the backlight module 100 is reflected and refracted multiple times in the first die 104 and the diffusion film 112, more first-direction polarized light in the natural light may be incident on the first polarizer. 106, and more of the second direction polarized light in the natural light is reflected back to the backlight module 100. In this embodiment, the angle θ between the first penetration axis direction Q and the first projection direction F (ie, the angle between the first penetration axis direction Q and the first extension direction N) can be reduced. The first direction is polarized to the transmittance of the first polarizer 106, and the fringes generated by the optical interference are not conspicuous. The first direction polarized light may be, but not limited to, P polarized light, and the second direction polarized light may be, but not limited to, S polarized light.

The first transmission axis direction Q and the first projection direction F are parallel to each other (ie, the first extension direction N and the first penetration axis direction Q are parallel to each other), and the first penetration axis direction Q is located in the first projection direction. F is rotated within a range of twenty degrees in a clockwise or counterclockwise direction (ie, the first penetration axis direction Q can be in the first extension direction N in a range of twenty degrees in a clockwise or counterclockwise direction) or first The projection direction F can be located in the first transmission axis direction Q in a range of twenty degrees in the clockwise or counterclockwise direction (ie, the first extension direction N can be located in the first transmission axis direction Q along the clockwise or inverse clock The direction is rotated within a range of twenty degrees). It should be noted that since the first polarizer 106 has the first transmission axis direction Q, the polarized light having the polarization direction parallel to the first transmission axis direction Q can penetrate the first polarizer 106.

In addition, the liquid crystal display device 100 can also adjust the first refractive index n _M of the first die 104 in the first alignment direction M and the second refractive index of the first die 104 in the first extending direction N. n _N further makes the first direction polarized light independent of the natural light and the second direction polarized light have the same transmittance in the first die 104 to avoid the photoelastic effect, thereby eliminating or improving the liquid crystal The display device produces a phenomenon in which the brightness is uneven. In the present embodiment, 0.02 ≦ | n _{M -} n _N | ≦ 0.3.

Please refer to "1A" and "3". "3" is a three-dimensional structure diagram of the first and second cymbals according to "1A". The liquid crystal display device 100 may further include a second cymbal 107 disposed between the first cymbal 104 and the diffusion 112. The second crotch panel 107 includes a plurality of second strips 80 and has a second extending direction N' and a second arraying direction M'. Each of the second strips 80 is arranged in the second array direction M', and the second array direction M' and the second extending direction N' are perpendicular to each other. Since the second extending direction N' is parallel to the first array direction M, the second extending direction N' and the first extending direction N are perpendicular to each other.

Please refer to FIG. 4, which is a side view of an embodiment of the first polarizer according to FIG. 1A. In this embodiment, the first polarizer 106 may be a matte-type polarizer, and the first polarizer 106 has a haze value of less than twenty-five percent. The matte type polarizer (ie, the first polarizer 106) may include an anti-glare layer 90, a first protective layer 92, a first polarizing layer 94, a second protective layer 96, an adhesive layer 98, and a release film 99. Since the matte-type polarizer (ie, the first polarizer 106) has an anti-glare layer 90 by anti-glare treatment, the fringes generated by the optical interference can be blurred, and the display brightness of the liquid crystal display device 100 can be more uniform, but The examples are not intended to limit the invention. For example, the first polarizer 106 may also be a glossy polarizer, and includes a first protective layer 92, a first polarizing layer 94, a second protective layer 96, an adhesive layer 98, and a release film 99 (please Referring to "figure 5", it is a side view of another embodiment of the first polarizer according to "FIG. 1A". Since the bright-surface type polarizer (ie, the first polarizer 106) is not subjected to the anti-glare treatment, the light of the incident bright-type polarizer (ie, the first polarizer 106) is not diffused, thereby being improved. The display brightness of the liquid crystal display device 100.

In addition, in the embodiment, the second polarizer 108 may be a bright-faced polarizer or a matte-type polarizer. The structure and effect of the second polarizer 108 being a bright-faced polarizer or a matte-type polarizer are the same as that of the first polarizer 106 being a bright-type polarizer or a matte-type polarizer. The effects are the same and will not be described here.

The liquid crystal display device 100 adopts an angle design between the first transmission axis direction Q and the first extending direction N, and the difference in refractive index between the first die 104 and the first array direction M and the first array direction M, respectively. The value design and the haze value design of the first polarizer 106 eliminate or improve the brightness unevenness caused by optical interference, but the above embodiments are not intended to limit the present invention. For example, the liquid crystal display device 100 can utilize the angle between the first transmission axis direction Q and the first extension direction N and the haze value design of the first polarizer 106 or utilize the first penetration axis direction Q and The angle between the first extending direction N and the first die 104 are respectively designed to have a difference in refractive index between the first extending direction N and the first array direction M, thereby eliminating or improving brightness unevenness caused by optical interference. phenomenon.

According to the embodiment of the liquid crystal display device of the present invention, the polarized light having different polarization directions can be changed by the angle between the first transmission axis direction and the first extension direction being between zero and twenty degrees. The transmittance of the first polarizer further eliminates or improves the brightness unevenness caused by optical interference. In addition, according to the embodiment of the liquid crystal display device disclosed in the present invention, the range of the first refractive index and the second refractive index can be adjusted to avoid the occurrence of the photoelastic effect, thereby eliminating or improving the brightness of the liquid crystal display device. Uniform phenomenon. Furthermore, according to the embodiment of the liquid crystal display device disclosed in the present invention, it is not necessary to utilize the high haze value of the first polarizer (ie, H ₁ >25%) or the first and first polarizers. The manner in which the diffusion sheet is added eliminates or improves the phenomenon in which the liquid crystal display device produces uneven brightness.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of patent protection of the invention is subject to the definition of the scope of the patent application attached to this specification.

50. . . light source

60. . . Light guide

70. . . First condition

80. . . Second condition

90. . . Anti-glare layer

92. . . First protective layer

94. . . First polarization layer

96. . . Second protective layer

98. . . Adhesive layer

99. . . Release film

100. . . Liquid crystal display device

102. . . LCD panel

104. . . First picture

105. . . Air layer

106. . . First polarizer

107. . . Second picture

108. . . Second polarizer

110. . . Backlight module

112. . . Diffusion sheet

1A is an exploded perspective view of an embodiment of a liquid crystal display device according to the present invention.

Fig. 1B is an assembled side view of the liquid crystal display device according to Fig. 1A.

Figure 2 is a schematic perspective view of the first die and the first polarizer according to Figure 1A.

Figure 3 is a schematic perspective view of the first cymbal and the second cymbal according to Figure 1A.

Figure 4 is a side elevational view of an embodiment of the first polarizer according to Figure 1A.

Figure 5 is a side elevational view of another embodiment of the first polarizer according to Figure 1A.

50. . . light source

60. . . Light guide

100. . . Liquid crystal display device

102. . . LCD panel

104. . . First picture

106. . . First polarizer

107. . . Second picture

108. . . Second polarizer

110. . . Backlight module

112. . . Diffusion sheet

Claims (12)

A liquid crystal display device comprising: a liquid crystal panel; a first polarizer plate disposed on one side of the liquid crystal panel and having a first transmission axis direction, wherein the first polarizer has a haze value of H ₁ And H ₁ ≦ 25%; a second polarizer is disposed on the other side of the liquid crystal panel relative to the first polarizer; a first die is disposed on the first polarizer relative to the On the other side of the liquid crystal panel, the first cymbal includes a plurality of first strips and has a first extending direction and a first arranging direction, and the first strips are along the first array Arranging directions, the first array direction is perpendicular to the first extending direction, wherein an angle between the first extending direction and the first penetrating axis direction is θ, and 0° ≦ θ ≦ 20°; and a backlight The module is disposed on the other side of the first die relative to the first polarizer. The liquid crystal display device of claim 1, wherein an air layer is sandwiched between the first die and the first polarizer. The liquid crystal display device of claim 1, wherein the liquid crystal display device further comprises a second cymbal plate disposed between the first cymbal sheet and the diffusion sheet and having a second extending direction The first extending direction and the second extending direction are perpendicular to each other. The liquid crystal display device of claim 1, wherein the second polarizer is a glare type polarizer. The liquid crystal display device of claim 1, wherein the second polarizer has a haze value of H ₂ and H ₂ ≦ 25%. A liquid crystal display device comprising: a liquid crystal panel; a first cymbal comprising a plurality of first strips and having a first extending direction and a first arranging direction, the first strips Arranging along the first alignment direction, the first alignment direction and the first extension direction are perpendicular to each other, wherein the first cymbal has a first refractive index n _M in the first alignment direction, and the first cymbal is The first extending direction has a second refractive index n _N and 0.02 ≦ | n _{M -} n _N | ≦ 0.3; a first polarizer is disposed between the first cymbal and the liquid crystal panel, and has a a first penetration axis direction, an angle between the first penetration axis direction and the first extension direction is θ, and 0° ≦ θ ≦ 20°; a second polarization piece disposed on the liquid crystal panel relative to The other side of the first polarizer; and a backlight module disposed on the other side of the first die relative to the first polarizer. The liquid crystal display device of claim 6, wherein the first polarizer is a bright-faced polarizer. The liquid crystal display device of claim 6, wherein the first polarizer has a haze value of H ₁ and H ₁ ≦ 25%. The liquid crystal display device of claim 6, wherein an air layer is sandwiched between the first die and the first polarizer. The liquid crystal display device of claim 6, wherein the liquid crystal display device further comprises a second cymbal plate disposed between the first cymbal sheet and the diffusion sheet and having a second extending direction The first extending direction and the second extending direction are perpendicular to each other. The liquid crystal display device of claim 6, wherein the second polarizer is a bright-faced polarizer. The liquid crystal display device of claim 6, wherein the second polarizer has a haze value of H ₂ and H ₂ ≦ 25%.