TW202004277A - Anti-glare display device - Google Patents

Abstract

An anti-glare display device includes a backlight module, a first polarizing layer, a second polarizing layer, a third polarizing layer, a first liquid crystal module, and a second liquid crystal module. The backlight module has a light exit surface. The first polarizing layer is disposed on the light exit surface. The first liquid crystal module is disposed on the first polarizing layer. The second polarizing layer is disposed on the first liquid crystal module. The second liquid crystal module is disposed on the second polarizing layer. The third polarizing layer is disposed on the second liquid crystal module.

Description

Anti-peep display device

The present invention relates to a display device, especially a display device with anti-peep function.

With the development of science and technology, the development of consumer electronics in the market is growing stronger. In this regard, portable electronic products are the mainstream, such as smart phones, smart phones or tablet computers. In addition to the basic functions, these consumer electronic products can still provide users with more and more powerful additional application functions. For example, in the case of a smart phone, in addition to providing basic call functions and information sending and receiving, it can still further provide users with functions such as web browsing, watching videos, or word processing. However, when the above additional application functions involve confidential or private information, these consumer electronic products will be inconvenient to use. In this regard, how to enable electronic products to present pictures while keeping information private has become a hot topic in related fields.

Current anti-spy display devices mostly use compensation films to improve the phase dispersion wavelength dispersion of liquid crystal (wavelength dispersion of retardation), but the phase retardation wavelength dispersion of the liquid crystal module must be well matched with the compensation film, otherwise the anti-spy display device will There is even color-shift and even light leakage.

In view of this, one object of the present invention is to provide a peep-proof display device that can solve the above problems.

In order to achieve the above object, according to one embodiment of the present invention, the privacy display device includes a backlight module, a first polarizing layer, a second polarizing layer, a third polarizing layer, a first liquid crystal module, and a second liquid crystal module. One of the first liquid crystal module and the second liquid crystal module is used to control the opening of the anti-spy mode, and the other is used for display.

In one or more embodiments of the present invention, one of the first liquid crystal module and the second liquid crystal module has two electrically controlled birefringent liquid crystal layers.

In one or more embodiments of the present invention, one of the first liquid crystal module and the second liquid crystal module has a two-twisted nematic liquid crystal layer.

In summary, in some embodiments of the anti-peep display device of the present invention, the anti-peep display device uses two electronically controlled birefringent liquid crystal layers to achieve the anti-peep effect of the display device, one of which is used for the electronically controlled birefringent liquid crystal layer. In order to control the opening and closing of the anti-peep function, another electronically controlled birefringence liquid crystal layer is used as a compensation film. In other embodiments of the anti-spy display device of the present invention, the anti-spy display device uses two twisted nematic liquid crystal layers to achieve the anti-spy effect of the display device, and one of the twisted nematic liquid crystal layers controls the opening and closing of the anti-spy function , Another twisted nematic liquid crystal layer is used as compensation film. In the above embodiments of the present invention, since the same type of liquid crystal structure is used as the compensation film, the phase retardation wavelength dispersion performance is consistent, so it has good compatibility and can solve the problems of color shift and light leakage.

The above is only for explaining the problem to be solved by the present invention, the technical means for solving the problem, and the resulting effect, etc. The specific details of the present invention will be described in detail in the following embodiments and related drawings.

100, 200, 300, 400, 500 ‧‧‧ anti-spy display device

110‧‧‧Backlight module

110a‧‧‧Outside

120‧‧‧First polarizing layer

130‧‧‧Second Polarizing Layer

140‧‧‧third polarizing layer

150‧‧‧The first LCD module

150a‧‧‧The first electronically controlled birefringence liquid crystal layer

150b‧‧‧Second electronically controlled birefringence liquid crystal layer

150c‧‧‧The first twisted nematic liquid crystal layer

150d‧‧‧Second twisted nematic liquid crystal layer

160‧‧‧second LCD module

160a‧‧‧First electronically controlled birefringence liquid crystal layer

160b‧‧‧Second electronically controlled birefringence liquid crystal layer

160c‧‧‧First twisted nematic liquid crystal layer

160d‧‧‧Second twisted nematic liquid crystal layer

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the drawings are described as follows:

FIG. 1 is a schematic side view showing a peep-proof display device according to an embodiment of the present invention.

FIG. 2A is a schematic side view showing a peep-proof display device according to another embodiment of the invention.

FIG. 2B is a schematic side view showing a peep-proof display device according to another embodiment of the invention.

FIG. 3A is a schematic side view showing a peep-proof display device according to another embodiment of the invention.

FIG. 3B is a schematic side view showing a peep-proof display device according to another embodiment of the invention.

In the following, a plurality of embodiments of the present invention will be disclosed in the form of diagrams. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and components will be shown in a simple schematic manner in the drawings.

Please refer to Figure 1. FIG. 1 is a plan view illustrating a privacy protection display device 100 according to one or more embodiments of the present invention. The privacy display device 100 includes a backlight module 110, a first polarizing layer 120, a second polarizing layer 130, a third polarizing layer 140, a first liquid crystal module 150 and a second liquid crystal module 160. The backlight module 110 has a light exit surface 110a. The first polarizing layer 120 is located on the light exit surface 110a. The first liquid crystal module 150 is located on the first polarizing layer 120. The second polarizing layer 130 is located on the first liquid crystal module 150. The second liquid crystal module 160 is located on the second polarizing layer 130. The third polarizing layer 140 is located on the second liquid crystal module 160.

Please refer to Figure 2A. As shown in FIG. 2A, in this embodiment, the first liquid crystal module 150 of the privacy display device 200 includes a first electronically controlled birefringent liquid crystal layer 150a and a second electrically controlled birefringent liquid crystal layer 150b. The liquid crystal molecules of an electrically controlled birefringent liquid crystal layer 150a have a first pretilt direction, and the liquid crystal molecules of the second electrically controlled birefringent liquid crystal layer 150b have a second pretilt direction different from the first pretilt direction. The first electronically controlled birefringent liquid crystal layer 150 a and the second electrically controlled birefringent liquid crystal layer 150 b are stacked on the backlight module 110. More specifically, the first electronically controlled birefringent liquid crystal layer 150a and the second electrically controlled birefringent liquid crystal layer 150b are stacked between the first polarizing layer 120 and the second polarizing layer 130.

Please refer to Figure 2A. In this embodiment, the first pretilt direction of the first electrically controlled birefringent liquid crystal layer 150a and the second pretilt direction of the second electrically controlled birefringent liquid crystal layer 150b differ by 180 degrees. The first polarizing layer 120 and the second polarizing layer 130 have the same polarization direction, and the polarizing directions of the second polarizing layer 130 and the third polarizing layer 140 differ by 90 degrees.

Please refer to Figure 2A. In this embodiment, when the user does not apply an electric field to the first electrically controlled birefringent liquid crystal layer 150a and the second electrically controlled birefringent liquid crystal layer 150b, the first electrically controlled birefringent liquid crystal layer 150a and the second electrically controlled The liquid crystals of the birefringent liquid crystal layer 150b are arranged along the first pretilt direction and the second pretilt direction, so that the light passing through the first polarizing layer 120 passes through the second polarizing layer 130 in the same direction, and the second electronically controlled birefringence The liquid crystal layer 150b is used as a compensation film to complement the phase delay of the first electronically controlled birefringent liquid crystal layer 150a, so as to achieve that the anti-peep display device 200 is in a sharing state that can be seen with a large viewing angle.

Please refer to Figure 2A. In this embodiment, when the user applies an electric field to the first electronically controlled birefringent liquid crystal layer 150a, the liquid crystals of the first electrically controlled birefringent liquid crystal layer 150a are aligned in a specific direction, so that the second electrically controlled birefringent liquid crystal layer The layer 150b can no longer be used as a compensation film to complement the phase retardation of the first electronically controlled birefringent liquid crystal layer 150a, so that the privacy display device 200 can only be seen with a small viewing angle and has a privacy effect.

Please refer to Figure 2B. As shown in FIG. 2B, in another embodiment, the second liquid crystal module 160 in the privacy display device 300 includes a first electrically controlled birefringent liquid crystal layer 160a and a second electrically controlled birefringent liquid crystal layer 160b, The liquid crystal molecules of the first electronically controlled birefringent liquid crystal layer 160a have a first pretilt direction, and the liquid crystal molecules of the second electrically controlled birefringent liquid crystal layer 160b have a second pretilt different from the first pretilt direction direction. The first electronically controlled birefringent liquid crystal layer 160a and the second electrically controlled birefringent liquid crystal layer 160b are superposed on the backlight module 110. More specifically, the first electrically-controlled birefringent liquid crystal layer 160a and the second electrically-controlled birefringent liquid crystal layer 160b are stacked between the second polarizing layer 130 and the third polarizing layer 140.

Please refer to Figure 2B. In this embodiment, the first pretilt direction of the first electrically controlled birefringent liquid crystal layer 160a and the second pretilt direction of the second electrically controlled birefringent liquid crystal layer 160b differ by 180 degrees. The polarizing directions of the first polarizing layer 120 and the second polarizing layer 130 are different by 90 degrees, and the polarizing directions of the second polarizing layer 130 and the third polarizing layer 140 are the same.

Please refer to Figure 2B. In this embodiment, when the user does not apply an electric field to the first electrically controlled birefringent liquid crystal layer 160a and the second electrically controlled birefringent liquid crystal layer 160b, the first electrically controlled birefringent liquid crystal layer 160a and the second electrically controlled The liquid crystals of the birefringent liquid crystal layer 160b are arranged along the first pretilt direction and the second pretilt direction, so that the light passing through the second polarizing layer 130 can pass through the third polarizing layer 140 in the same direction, and the second electronically controlled birefringence The liquid crystal layer 160b is used as a compensation film to complement the phase delay of the first electronically controlled birefringent liquid crystal layer 160a, so as to achieve that the anti-peep display device 300 is in a sharing state that can be seen with a large viewing angle.

Please refer to Figure 2B. In this embodiment, when the user applies an electric field to the first electronically controlled birefringent liquid crystal layer 160a, the liquid crystals of the first electrically controlled birefringent liquid crystal layer 160a are aligned in a specific direction, so that the second electrically controlled birefringent liquid crystal layer 160a The layer 160b can no longer be used as a compensation film to complement the phase delay of the first electronically controlled birefringent liquid crystal layer 160a, so that the privacy display device 300 can only be seen with a small viewing angle and has a privacy effect.

Please refer to Figure 3A. As shown in FIG. 3A, in another embodiment, the first liquid crystal module 150 in the privacy display device 400 includes a first twisted nematic liquid crystal layer 150c and a second twisted nematic liquid crystal layer 150d, wherein The liquid crystal molecules of a twisted nematic liquid crystal layer 150c have a first rotation direction, and the liquid crystal molecules of a second twisted nematic liquid crystal layer 150d have a second rotation direction different from the first rotation direction, the first twisted nematic The liquid crystal layer 150c and the second twisted nematic liquid crystal layer 150d are stacked above the backlight module 110. More specifically, the first twisted nematic liquid crystal layer 150c and the second twisted nematic liquid crystal layer 150d are stacked between the first polarizing layer 120 and the second polarizing layer 130.

Please refer to Figure 3A. In this embodiment, the first pretilt direction of the first twisted nematic liquid crystal layer 150c and the second pretilt direction of the second twisted nematic liquid crystal layer 150d differ by 90 degrees. The polarizing directions of the first polarizing layer 120 and the second polarizing layer 130 are the same, and the polarizing directions of the second polarizing layer 130 and the third polarizing layer 140 are different by 90 degrees.

Please refer to Figure 3A. In this embodiment, when the user does not apply an electric field to the first twisted nematic liquid crystal layer 150c and the second twisted nematic liquid crystal layer 150d, the first twisted nematic liquid crystal layer 150c and the second twisted nematic liquid crystal The liquid crystal of the layer 150d is arranged along the first pretilt direction and the second pretilt direction, so that the light energy passing through the first polarizing layer 120 passes through the second polarizing layer 130 in the same direction, and the second twisted nematic liquid crystal layer 150d Used as a compensation film, the phase delay of the complementary first twisted nematic liquid crystal layer 150c is achieved to achieve that the anti-peep display device 400 is in a sharing state that can be seen with a large viewing angle.

Please refer to Figure 3A. In this embodiment, when the user applies an electric field to the first twisted nematic liquid crystal layer 150c, the liquid crystal of the first twisted nematic liquid crystal layer 150c is aligned in a specific direction, so that the second twisted nematic liquid crystal layer 150d The phase retardation of the first twisted nematic liquid crystal layer 150c can no longer be complemented by the compensation film, so that the privacy display device 400 can only be seen with a small viewing angle and has a privacy effect.

Please refer to Figure 3B. As shown in FIG. 3B, in another embodiment, the second liquid crystal module 160 of the privacy display device 500 includes a first twisted nematic liquid crystal layer 160c and a second twisted nematic liquid crystal layer 160d, wherein the first The liquid crystal molecules of the twisted nematic liquid crystal layer 160c have a first pretilt direction, and the liquid crystal molecules of the second twisted nematic liquid crystal layer 160d have a second pretilt direction that is different from the first pretilt direction, the first twist The nematic liquid crystal layer 160c and the second twisted nematic liquid crystal layer 160d are stacked above the backlight module 110. More specifically, the first twisted nematic liquid crystal layer 160c and the second twisted nematic liquid crystal layer 160d are stacked between the second polarizing layer 130 and the third polarizing layer 140.

Please refer to Figure 3B. In this embodiment, the first pre-tilt direction of the first twisted nematic liquid crystal layer 160c and the second pre-tilt direction of the second twisted nematic liquid crystal layer 160d differ by 90 degrees. The polarizing directions of the first polarizing layer 120 and the second polarizing layer 130 are different by 90 degrees, and the polarizing directions of the second polarizing layer 130 and the third polarizing layer 140 are the same.

Please refer to Figure 3B. In this embodiment, when the user does not apply an electric field to the first twisted nematic liquid crystal layer 160c and the second twisted nematic liquid crystal layer 160d, the first twisted nematic liquid crystal layer 160c and the second twisted nematic liquid crystal The layer 160d is arranged along the first pretilt direction and the second pretilt direction, so that the light energy passing through the second polarizing layer 130 passes through the third polarizing layer 140 in the same direction, and the second twisted nematic liquid crystal layer 160d serves as compensation The film is used to complement the phase delay of the first twisted nematic liquid crystal layer 160c, so as to achieve that the anti-spy display device 500 is in a sharing state that can be seen with a large viewing angle.

Please refer to Figure 3B. In this embodiment, when the user applies an electric field to the first twisted nematic liquid crystal layer 160c, the liquid crystal of the first twisted nematic liquid crystal layer 160c is aligned in a specific direction, so that the second twisted nematic liquid crystal layer 160d The phase retardation of the first twisted nematic liquid crystal layer 160c can no longer be complemented by the compensation film, so that the privacy display device 500 can only be seen with a small viewing angle and has a privacy effect.

In one or more embodiments, the first liquid crystal module 150 or the second liquid crystal module 160 of the privacy display device 100 has two flexible substrates and liquid crystal molecules accommodated between the two flexible substrates, so that The first liquid crystal module 150 or the second liquid crystal module 160 of the anti-spy display device 100 of the present invention is flexible, and will not be broken by the anti-spy display device 100 falling.

From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that the anti-spy display device of the present invention has two liquid crystal modules, one of which has two liquid crystal layers to control the opening and closing of the anti-spy function As well as being used as a compensation film, since the present invention uses the same type of liquid crystal layer as the compensation film of another liquid crystal layer, the phase retardation wavelength dispersion will be consistent, so it has good compatibility, and can solve color shift and light leakage The problem. In addition, the first liquid crystal module or the second liquid crystal module can use a flexible substrate to accommodate liquid crystal molecules, so that the anti-peep display device can prevent the substrate from breaking when dropped.

From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that although the present invention has been disclosed as above, it is not intended to limit the present invention. Anyone who is familiar with this skill will not deviate from the present invention. Within the spirit and scope, various changes and modifications can be made, so the protection scope of the present invention shall be subject to the scope defined in the appended patent application.

100‧‧‧Peep-proof display device

110‧‧‧Backlight module

110a‧‧‧Outside

120‧‧‧First polarizing layer

130‧‧‧Second Polarizing Layer

140‧‧‧third polarizing layer

150‧‧‧The first LCD module

160‧‧‧second LCD module

Claims (10)

An anti-peep display device, including: A backlight module with a light emitting surface; A first polarizing layer located on the light exit surface; A first liquid crystal module, located on the first polarizing layer; A second polarizing layer on the first liquid crystal module; A second liquid crystal module on the second polarizing layer; and A third polarizing layer is located on the second liquid crystal module. The anti-peep display device according to claim 1, wherein one of the first liquid crystal module and the second liquid crystal module includes: A first electrically controlled birefringence liquid crystal layer, the liquid crystal molecules of which have a first pretilt direction; and A second electronically controlled birefringent liquid crystal layer, the liquid crystal molecules of which have a second pretilt direction different from the first pretilt direction, wherein the first electrically controlled birefringent liquid crystal layer and the second electrically controlled double The refraction type liquid crystal is laminated on the backlight module. The anti-peep display device according to claim 2, wherein the first pre-tilt direction and the second pre-tilt direction differ by 180 degrees. The anti-peep display device according to claim 2, wherein when the first liquid crystal module is used, the polarization directions of the first polarizing layer and the second polarizing layer are the same. The anti-peep display device according to claim 2, wherein when the second liquid crystal module is used, the polarization directions of the second polarizing layer and the third polarizing layer are the same. The anti-peep display device according to claim 1, wherein one of the first liquid crystal module and the second liquid crystal module includes: A first twisted nematic liquid crystal layer, the liquid crystal molecules of which have a first direction of rotation; and A second twisted nematic liquid crystal layer, the liquid crystal molecules of which have a second rotation direction different from the first rotation direction, wherein the first twisted nematic liquid crystal layer and the second twisted nematic liquid crystal layer are laminated Above the backlight module. The anti-peep display device according to claim 6, wherein the pre-tilt directions of the first twisted nematic liquid crystal layer and the second twisted nematic liquid crystal layer differ by 90 degrees. The anti-peep display device according to claim 6, wherein when the first one is a first liquid crystal module, the polarization directions of the first polarizing layer and the second polarizing layer are the same. The anti-peep display device according to claim 6, wherein when the second liquid crystal module is used, the second polarizing layer and the third polarizing layer have the same polarization direction. The anti-peep display device according to claim 1, wherein at least one of the first liquid crystal module and the second liquid crystal module has two flexible substrates and liquid crystal molecules accommodated between the two flexible substrates .

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