KR100998695B1 - Visual angle regulation type display equipment - Google Patents

Abstract

The present invention relates to a display device having a viewing angle adjustment function, and in particular, a display angle adjustable display for easily switching the viewing angle extension mode and reduction mode according to a user's request without greatly changing the configuration of the existing display device. It provides a device that can be applied to any display device without requiring complicated configuration as in the prior arts, and it usually secures a wide viewing angle and, if necessary, narrows according to the control of the control device under the user's choice or special conditions. The viewing angle can be secured, and furthermore, the power consumption is generated only when the narrow viewing angle is selected, and thus has a very suitable utilization for the mobile communication device.

View angle adjustment, display device

Description

Display device with adjustable viewing angle {VISUAL ANGLE REGULATION TYPE DISPLAY EQUIPMENT}

The present invention relates to a display device having a viewing angle adjustment function, and in particular, a display angle adjustable display for easily switching the viewing angle extension mode and reduction mode according to a user's request without greatly changing the configuration of the existing display device. Relates to a device.

In general, electronic display devices such as monitors used with computers and screens embedded in telephones and portable information devices are designed to have a wide viewing angle so that they can be read in as many viewing positions as possible.

However, there are some situations where it is useful to have a display that is only visible in a narrow range of angles. For example, if someone is reading a confidential or private document on the display of a mobile device in a crowded place, he will want to minimize the risk that others around him will also see the document on the display.

It is therefore useful to have a display device that can switch between two modes of operation. That is, the display device in the public mode has a wide viewing angle for general use, and the display device in the private mode will have a narrow viewing angle in order to allow private information to be read in public places.

For example, when certain secure web pages (e.g., bank site web pages) are accessed, or when a certain personal identification number (bank account account PIN) is entered with a keyboard, the display is automatic. To switch to privacy mode. In stealth mode, an indicator or icon may be displayed on the screen to indicate that stealth mode is in effect.

This concept can also be applied to a number of other device types in places where the user wants to see confidential information but has no control over who may be watching. Examples include mobile phones, personal digital assistants (PDAs), laptop PCs, desktop monitors, Automatic Teller Machines (ATMs), and Electronic Point of Sale (EPoS) equipment.

Many devices are known that limit the range of angles or locations at which a display can be viewed.

US 6,552,850 describes a method for displaying personal information on a cash dispenser. The light emitted by the display of the dispenser has a fixed polarization state. The dispenser and the user of the dispenser are surrounded by a large screen of sheet polarizer that absorbs light in its polarization state but passes an orthogonal state. People passing by can see the user and the dispenser, but not the information displayed on the screen.

One way to control the direction of light is to use "louvred" films. Such films consist of alternating transparent and opaque layers in an arrangement similar to venetian blinds. These layers may be perpendicular to the film surface or at some other angle. Similar to venetian blinds, barb films pass light when the light is traveling in a direction that is nearly parallel to the planes of the layers, but absorbs light that is running at an angle that is highly tilted to the planes of the layers. Methods of making such films are described in US 4,766,023 and US 4,764,410.

Other methods exist for making films with properties similar to barbed films. These are described, for example, in US 5,147,716 and US 5,528,319.

The techniques described above can be used to limit the range of angles at which a display can be viewed, that is, they can be used to "secretize" the display. None of these however provide a way in which the privacy function can be easily switched off to allow viewing from a wide range of angles.

Several methods are known for providing a display that can be switched between a wide viewing angle open mode and a narrow viewing angle secret mode.

US 2002/0158967 describes a light control film mounted on a display such that the light control film can be moved to the front of the display to provide a secret mode or mechanically retracted into a holder at the back or side of the display to provide an open mode. Explain the use of. This method requires moving parts that can fail or be damaged and has the disadvantage of significantly increasing the volume of the display.

One method for switching from public to secret mode without moving parts is to mount a light control film behind the display panel and to place a diffuser that can be switched on and off electronically between the light control film and the panel. If the diffuser does not operate, the light control film defines a range of viewing angles and the display is in a stealth mode.

When the diffuser is switched on, the diffuser causes light in progress through a wide range of angles to pass through the panel and the display is in open mode. The same effect can also be realized by mounting the light control film in front of the panel and placing the switchable diffuser in front of the light control film.

Switchable privacy devices of this type are described in US Pat. No. 5,831,698, US Pat. No. 6,211,930 and US Pat. No. 5,877,829. They share the disadvantage that the light control film absorbs much of the light incident upon it, regardless of whether the display is in open or secret mode. Thus the display is inefficient in its light use. In open mode, the diffuser spreads light through a wide range of angles, so unless the backlight is brighter for compensation, these displays are also darker in open mode than in secret mode.

Another disadvantage is the power consumption of these devices. In open mode of operation the diffuser is switched off. This will typically mean that a voltage is applied to the switchable polymer dispersed liquid crystal diffuser.

Therefore, more power is consumed in open mode than in secret mode. This is a disadvantage for displays used in most cases in open mode.

Another known method for providing a switchable public / secret display is described in US Pat. No. 5,825,436. The disclosed light control device is similar in structure to the barbed film described above. However, each of the opaque elements of the barbed film is replaced by a liquid crystal cell that can be electronically switched from the opaque state to the transparent state. The light control device is disposed in front of or behind the display panel. If the cells are opaque, the display is in secret mode; If the cells are transparent, the display is in public mode.

One disadvantage of this method relates to the difficulty and cost of producing liquid crystal cells of a suitable form. Another disadvantage is that in the stealth mode, the light rays can be input at an angle where the light rays first pass through the transparent material and then through the liquid crystal cell portion. Such light rays will not be completely absorbed by the liquid crystal cell, which can reduce the privacy of the device.

Another method for generating a switchable public / secret display device is disclosed in JP 3607272. The disclosed apparatus uses additional liquid crystal panels with patterned liquid crystal alignment. Differently oriented segments of the panel modify the viewing characteristics for different areas of the display in different ways, resulting in the entire display panel being completely readable only in the central position.

GB-A-2405544 and JP 2005-078093 describe switchable privacy devices based on loures, which only operate for one polarization of light. The barbs are switched on and off by rotating the dyed liquid crystal molecules of the barb itself or by rotating the polarization plane of the incident light using a separate device.

GB-A-2410116 (WO 2005/071449) discloses a variety of backlight arrangements for use in display devices having the ability to switch the viewing angle, for example, between public and secret modes. There are further known systems and techniques in this field as well.

GB-A-2413394 (US 2005/0243265) discloses a switchable privacy device constructed by adding one or more additional liquid crystal layers and polarizers to a display panel. The inherent viewing angle dependence of these additional elements can be modified by electrically switching the liquid crystals.

US 2003/0146893 discloses a polarization modifying layer (PML) disposed behind an exit polarizer of a liquid crystal display panel. Portions of the PML are transparent. The other parts change the polarization of the light passing through these parts so that the colors of the pixels seen through these parts are reversed (light pixels darken and dark pixels lighten). The data sent to the pixels immediately behind these parts is inverted so that the image looks normal when the display is viewed in the center position.

However, when the display is viewed from different angles, different pixels are viewed through retarder elements and the image is corrupted. Off-axis viewers see a confusing image, for example a random dot pattern. The PML can be formed from the liquid crystal and switched off to provide an open mode.

GB-A-2418518 discloses a device in which a guest host (dyed) LC layer with a patterned electrode is added to a standard TFT LC display. The stained LC layer can be switched between absorbed (secret) and non-absorbed (public) states. The absorbance of the dye molecules depends on the angle of incidence and polarization of the light. For certain polarizations and directions, the absorbance of the pigment results in low brightness (narrow mode) at high angles and increases with increasing viewing angles.

Pending UK patent application 0510422.9 discloses a combination of a privacy function and a 3D function provided by only one additional switching cell. The display has three operating states: wide mode; Secret mode; And 3D mode. Both examples of patterned and unpatterned LC orientation are described.

The concept of using holograms to provide privacy features was first described in GB-A-2404991 (US 2005/0063029). However, due to unwanted diffraction by holograms on the light from the display, the color of the image seen by the viewers may be affected. In addition, for applications using a touch screen mounted in front of the display, the user's hand may block the illumination of the hologram to reduce the effectiveness of the secret mode.

Pending British Patent Application No. 0511536.5 discloses the use of an additional liquid crystal layer disposed between existing polarizers in an LCD panel.

In this position, the additional switching cell can modify the gray scale curves of off-axis light. This provides a higher level of privacy for images than for example the techniques disclosed in GB-A-2413394 (US 2005/0243265).

US 5,109,219 describes a method for controlling the viewing angle of an LC display by converting a digital viewing angle parameter into an analog bias voltage applied to the LC. However, the technology will only modify the viewing angle features of the display and will not hide the image from wide angles.

US 5,936,596 and JP 2003-295160 (US 2006/0126156) describe changing the voltage range applied to the pixels of an LC display to modify the viewing angle. Lookup tables are used to change the display between a narrow viewing angle mode and a wide viewing angle mode. However, since this method does not hide the displayed information, in narrow mode, this method only corrects the gray scale mapping to distort the image.

"A Method for Concealment of Displayed Data", M. Dogruel, Displays, vol. 24, no. The paper of 3, October 2003 describes a method for hiding data displayed on a display by sequentially rendering the image and its inversion of images at a faster rate than the human eye can perceive. Thereby, the indifferent observer's eye averages the images and thus sees a uniform gray display screen. To see the secret image, the user must wear shuttered glasses synchronized with the display so that the reversed image is blocked. This method has several disadvantages: first, the user must wear shutter-type glasses to observe the correct image; Second, image privacy can also be compromised by quickly moving the sawtooth object across the field of view of the display and blurring portions of the image that are offset by it; Third, it is very difficult to design two images completely offset, so a ghost image can be observed. This paper also describes adding a third image that acts as a confusing image, but this requires the display to be run at three times the normal video speed.

Rocket Software, Inc. (http://www.rocketsoftware.com) has developed a software package that provides some level of privacy using the unique properties of LC displays. The software modifies the image sent to the display by applying additional patterning that reduces the gray levels or contrast of the image across the entire image. Due to the non-linear response of the display, the image is only slightly disturbed when viewed on-axis, but when viewed off-axis, there is a reduction level that results in improved contrast patterning due to the non-linear response of the display. Is formed. However, this solution inevitably affects the display's on-axis performance to some extent, and pattern visibility will hinder even authorized users who are using the display in secret mode. Also, in practice, patterning alone is insufficient to provide adequate privacy levels on the off-axis.

WO 03/015424 discloses an optical switching device comprising a passive birefringent lens and a switchable polarizer. By switching the polarization different directional distributions of the output light are provided. However, when activated, the lenses show no difference in the angle at which light is imaged.

US 6,369,949 discloses optically anisotropic micro-lens windows. Since the described imaging element is non-switchable, an apparatus using this technique cannot switch between open and secret modes of operation.

GB-A-2410339 discloses the use of multiple arrays of polarization sensing lenses in a polarization optical conversion system.

JP 09-230377 and US 5,844,640 describe how to change the viewing angle characteristics of a single layer LCD panel. This is realized for Vertically Aligned Nematic (VAN) LC mode. The electric fields of the display panel surface are used to control the degree to which the LC material is tilted in the pixel region. The number and direction of different gradient domains in a pixel can be controlled by in-plane fields. A pixel with several oblique domains will have a wide viewing angle, while a pixel with one oblique domain will have a narrow viewing angle. Using this method to modify the viewing angle of the display is described.

However, the viewing angle of the single tilt domain of the described VAN mode is generally not narrow enough to provide a good privacy mode.

JP 3405972 describes a single LC panel that provides a narrow viewing angle mode LCD using a patterned LC array. However, this narrow mode is fixed and there is no wide field of view.

An object of the present invention for solving the above problems is to provide a display device capable of adjusting the viewing angle to easily switch the viewing angle expansion mode and reduction mode according to the user's request without greatly changing the configuration of the existing display device There is.

Features of the display device capable of adjusting the viewing angle according to the present invention for achieving the above object,
Pixels expressing luminance and color are arranged in a matrix structure to form a display area, and a front glass 200 positioned in front of the image part 100 to protect the image part 100. In the display device provided with
A light diffusion suppressing unit (300) positioned at the front of the image unit (100) and configured to transmit and transmit straightness to the light of the image unit (100) irradiated from the rear side;
Located between the front of the light diffusion suppressing unit 300 and the front glass 200 to scatter or diffuse the light having a straightness transmitted through the light diffusion suppressing unit 300 by an external control signal or to maintain the straightness. Including a light diffusion control unit 400;
The viewing angle of the image of the image part 100 having the straightness imparted through the light diffusion suppressing unit 300 in the light diffusion adjusting unit 400 is narrow or diffused to have a wide viewing angle.

Another feature of the display device capable of adjusting the viewing angle according to the present invention for achieving the above object,
The backlight unit 17 and pixels positioned in front of the backlight unit 17 to control the amount of light emitted from the backlight unit 17 to express luminance and color are arranged in a matrix structure to form a display area. In the display device 100 and the display device which is located in front of the image portion 100 and having a front glass 200 for protecting the image portion 100:
A light diffusion suppressing unit (300) positioned at the front of the backlight unit (17) and configured to transmit and transmit straightness to the light of the backlight unit (17) irradiated from the rear;
Located between the front surface of the light diffusion suppressing unit 300 and the image unit 100 to scatter or diffuse the light having a straightness transmitted through the light diffusion suppressing unit 300 by an external control signal or to maintain the straightness. Including a light diffusion control unit 400;
In the light diffusion controller 400, the viewing angle of the image of the image part 100 having the straightness imparted through the light diffusion suppressing unit 300 is narrow or diffused so as to have a wide viewing angle. .

As an additional feature of the display device capable of adjusting the viewing angle according to the present invention for achieving the above object, the light diffusion suppressing unit 300 is a film of a light transmissive material, slots for the entire area of the front or rear After the (scabbard) is formed, it is molded and planarized by a film of the same material, and a slot (scabbard) is formed with respect to the entire area of the front rear surface of the light diffusion suppressing unit 300, and then by the film of the same material. It is used to laminate what is molded and planarized.

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As another additional feature of the display device capable of adjusting the viewing angle according to the present invention for achieving the above object, the slot (sheath) formed in the light diffusion suppressing unit 300 is formed through a process such as pressing or etching. It is formed.

In addition to the additional feature of the display device capable of adjusting the viewing angle according to the present invention for achieving the above object, the light diffusion control unit 400 uses a polymer dispersed liquid crystal (PDLC) There is.

The expected effects due to the features of the present invention described above are applicable to all display elements without requiring a complicated configuration as in the conventional prior arts, and usually ensure a wide viewing angle and a user's selection or special needs. Under the conditions, a narrow viewing angle can be secured according to the control of the control device, and furthermore, power consumption is generated only when the narrow viewing angle is selected.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

First, with reference to the accompanying drawings, the technical idea that is applied to the present invention will be briefly described.

Before looking at the technical idea of the present invention, referring to Figures 1 to 3 attached to the configuration of the liquid crystal display and its characteristics of the display device, Figure 1 is attached to each configuration of a general liquid crystal display module (MDL) In the exploded perspective view showing the components, each member is superimposed in an up-and-down arrangement relationship as shown in the drawing to assemble a liquid crystal display module (MDL) 10.

The configuration of the liquid crystal display module (MDL) 10 shown in FIG. 1 is a general configuration, and a detailed description thereof will be omitted, and a brief description of the configuration referred to by reference numerals 11 will refer to a frame shape in which the SHD is made of a metal plate. Is a shield case (metal frame; SMD), reference numeral 12 is a display window thereof, reference numeral 13 is a liquid crystal display panel, reference numeral 14 is a light diffusion plate, and reference numeral 15 is a light guide. It is a sieve, reference numeral 16 is a reflecting plate, reference numeral 17 is a backlight unit, and reference numeral 18 is a backlight case.

At this time, the entire liquid crystal display module 10 is fixed by hooks and hooks provided in the shield case 11.

In addition, the backlight case 18 is shaped to accommodate the backlight unit 17, the light diffusion plate 14, the light guide 15, and the reflector 16, and the backlight disposed on the side of the light guide 15. The light irradiated from the backlight fluorescent tube of the unit 17 is used as the same backlight on the display surface by the light guide 15, the reflecting plate 16, and the light diffusing plate 14, and is irradiated toward the liquid crystal display panel 13 side. .

An inverter circuit board PCB2 is connected to the backlight fluorescent tube of the backlight unit 17, and is used as a backlight fluorescent tube power supply of the backlight unit 17.

Although the configuration of FIG. 1 described above may be further subdivided, it is illustrated as shown in FIG. 2 for simplicity in order to facilitate the description of the present invention.

In the accompanying FIG. 2, reference numerals 16 (reflective plates), 15 (light guides), 14 (light diffusers), and 13 (liquid crystal display panels) in FIG.

As shown in FIG. 1 and FIG. 2, the case where the backlight unit 17 is located on one side is actually a conventional technology, and in recent years, uniform luminance is maintained on the entire rear surface of the liquid crystal display device called LCD. It is generally located wide to

Accordingly, as shown in FIG. 3, the light emitted from the backlight unit 17 emits light on a straight path and light on a diffused path, and the light passes through a liquid crystal display (LCD). The light emitted from the backlight unit 17 in the process of transmitting the liquid crystal display device (LCD) has a difference in color and brightness, so that the user has the liquid crystal display device (LCD). You will recognize the information displayed in.

Therefore, as shown in FIG. 3, although the light is vertically and straight from the backlight unit 17 toward the LCD 100, the light diffuses radially due to the characteristics of the light. In some angles, the information displayed on the LCD 100 may be recognized from the side surface, and this angle is called a viewing angle.

Therefore, in order to allow only a direct user to recognize the information displayed on the LCD 100, the viewing angle may be prevented by blocking or suppressing light diffused to the periphery and transmitting it in a direction perpendicular to the LCD 100. In contrast, when the light transmitted in the vertical direction with respect to the liquid crystal display (LCD) 100 is diffused, the viewing angle is widened, so that the user recognizes it.

Therefore, a slot for suppressing a diffusion path in the path of the light radiated from the backlight unit 17 to the LCD 100 is transmitted to the LCD 100 in a vertical direction. As shown in FIG. 4 with the slit portion 20 implemented structurally, the slits 20 have a narrow viewing angle.

On the other hand, as shown in FIG. 5, in the direction of the light emitted from the backlight unit 17 toward the liquid crystal display (LCD) 100 in a direction perpendicular to the liquid crystal display (LCD) 100. When the diffusion layer 30 is formed between the liquid crystal display (LCD) 100 and the backlight unit 17 to diffuse the transmitted light, the viewing angle is widened.

Therefore, the present invention contemplates that if the combined concepts of FIGS. 4 and 5 are combined, the viewing angle extension mode and the reduction mode can be easily switched at the request of the user without greatly changing the configuration of the existing display apparatus. .
3 through 5, reference numeral 200 denotes a front glass provided on an upper surface side of a liquid crystal display (LCD) 100.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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6 is a simplified cross-sectional view illustrating structural features of a display device capable of adjusting a viewing angle according to the present invention, and is an example of a case where the LCD is applied to a liquid crystal display (LCD). Between the device LCD 100 and the backlight unit 17 for recognizing information displayed on the LCD 100 at a user's point of view. The slot film 300 which provides straightness to the light emitted from the backlight unit 17 and the slot film 300 positioned on the front of the slot film 300 according to the applied concept and depending on whether a DC voltage is applied. It is composed of a polymer dispersed liquid crystal (PDLC) that does not disturb or scatter the light propagation through the light propagation path to diffuse.
The image unit 100 in each of the claims of the present invention corresponds to a liquid crystal display (LCD) 100 in one embodiment. In the following description and drawings, the image unit 100 is applied to a liquid crystal display (LCD) 100. The reference numeral 200 denotes a front glass.
The front glass 200 is provided on the upper surface of the image unit 100, that is, the liquid crystal display (LCD) 100 corresponding to the image unit in the present invention corresponds to a general configuration for protecting the surface of the LCD.
In addition, the light diffusion suppressing unit 300 described in the claims of the present invention is described as a slot film in the description of the embodiment, the light diffusion control unit 400 is described by the embodiment of the polymer dispersed liquid crystal.
In the following description and the accompanying drawings and the description, the slot film is denoted by the reference numeral 300, and the polymer dispersed liquid crystal is denoted by the reference numeral 400 and described.

The polymer dispersed liquid crystal (PDLC) 400 will be described. The polymer dispersed liquid crystal (PDLC) 400 may be momentarily driven when DC is applied, but does not react thereafter. Has the characteristic of reacting.

In addition, the polymer dispersed liquid crystal (PDLC) 400 controls light transmission according to the scattering intensity of light, and does not require a polarizing plate. Several types of structures have been proposed, such as a large number of i) dispersed therein or a liquid crystal contained in a reticulated polymer.

If there is no voltage, the liquid crystal molecules become an irregular direction and scatter at an interface with different refractive index from the medium. When voltage is applied, the direction of the liquid crystal is neat and the refractive indexes of both coincide to be in a transmissive state.

Therefore, FIG. 6 is a structural feature of the display device capable of adjusting the viewing angle according to the present invention. The slot film referred to by reference numeral 300 corresponding to the light diffusion suppressing unit maintains a narrow viewing angle. The light having only linearity is scattered by the polymer dispersed liquid crystal 400 of reference numeral 400 corresponding to the light diffusion control unit 300 to have a wide viewing angle.

Substantially, since the voltage is not applied to the polymer dispersed liquid crystal (PDLC) 400 as described above, the polymer dispersed liquid crystal (PDLC) is required when a wide viewing angle is required. A narrow viewing angle is applied by applying a voltage to 400, but the description will be described in the opposite concept for ease of explanation.

7 is an example in which a voltage is applied to the polymer dispersed liquid crystal (PDLC) 400 so that the direction of the liquid crystal in the polymer dispersed liquid crystal (PDLC) 400 is aligned and the refractive indices of the two liquid crystals coincide with each other. In this case, the polymer dispersed liquid crystal (PDLC) 400 is the same as that of the light emitted from the backlight unit 17.

Therefore, as shown in FIG. 7, the light emitted from the backlight unit 17 has a straightness in the process of passing through the slot film 300. Projected in a vertical direction.

In this state, the user feels that the viewing angle is narrow.

On the other hand, when the voltage applied to the polymer dispersed liquid crystal (PDLC) 400 is blocked while maintaining the state of FIG. 7, the light emitted from the backlight unit 17 as shown in FIG. 8 is attached. In the state of having a straightness in the process via the slot film 300, the light is diffused by scattering like a dotted line by the liquid crystal in the polymer dispersed liquid crystal (PDLC) 400.

Therefore, the viewing angle of the user is widened.

Such a structural feature of the display device capable of adjusting the viewing angle according to the present invention is not limited to the liquid crystal display device as in the above-described embodiment, but is applicable to all flat panel display devices.

That is, a display device generally includes a display device using a cathode ray tube such as a cathode ray tube (CRT) or a vacuum fluorescent display (VFD), a backlit display device such as a liquid crystal display (LCD), and a plasma display panel (PDP). The type may be classified into a self-luminous display device such as an organic light-emitting diode (OLED) or a field emission display (FED).

However, the characteristic of all display devices is that the light generated from the display device stimulates the user's vision, and at this time, the viewing angle is different depending on the degree of light diffusion generated from the display device.

Therefore, the configurations referred to by the reference numerals 300 and 400 are not located in front of the backlight unit 17 as shown in the accompanying FIGS. 6 to 8, but as shown in the accompanying FIG. If it is located in front of the image unit 100 can be applied to all display devices in common.

At this time, the slot film 300 is a film of a light transmissive material, the slot (sheath) is formed through a process such as sheath, press work or etching, and then molded and planarized by a film of the same material.

Therefore, the slot (scabbard) is formed as a part as a partition wall as shown in Figure 4, to secure the straightness of the light through the slot (scabbard).

If you want to maintain the straightness for more light may be used by stacking the slot film (300).

On the other hand, the light diffusion suppressing portion, that is, the slot (sheath) formed in the slot film 300 may be made of any one of a horizontal line, a vertical line, a diagonal line, or the horizontal line, a vertical line, a diagonal line may be embodied in combination.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with it will know easily.

For example, it is well known that the partial or selective viewing angle can be adjusted by the PDLC electrode arrangement, and it is well known that the PDLC or a similar function belong to the present invention even if it is a substitute for the same function.

The most common alternative to PDLC is polymer stabilized liquid crystals (PSLC). Briefly, the characteristics of the polymer-modified liquid crystals (PSLC) are a structure in which a polymer is formed into a network in the liquid crystal. It is a display of a method of obtaining a stable liquid crystal alignment and excellent electrical properties by using. In the manufacturing method, a raw material of a polymer material cured by ultraviolet light is mixed into a small amount of liquid crystal and injected into a commercial liquid crystal, followed by exposure to ultraviolet light, so that the raw material of the polymer material forms a polymer network inside the liquid crystal. At this time, the alignment direction of the liquid crystal molecules may be arbitrarily adjusted by using the electric field or the like. After the polymer is produced, the alignment of the liquid crystal is maintained by the polymer to form. At this time, when the electric field of which the polarity or the intensity is controlled is applied from outside, the liquid crystal molecules are rearranged by the electric field again to induce the change of the refractive index, and change the polarization component of the transmitted light to control the intensity of light passing through the polarizer. It becomes possible. On the other hand, if the electric field is removed, it is returned to its original direction by the polymer network.

Therefore, in accordance with the object of the present invention in accordance with the above-described embodiment of the present invention, the replaceable device or the borrowing of such a device is also within the scope of the present invention.

1 is an exemplary view showing a configuration of a general liquid crystal display device

Figure 2 is a simplified illustration of the configuration of the accompanying Figure 1

3 is an exemplary view for explaining a light irradiation path in the configuration of FIG.

4 and 5 is an exemplary view for explaining the technical idea applied to the present invention

6 is an exemplary view for explaining the configuration of a display device capable of adjusting the viewing angle according to the present invention;

7 and 8 are exemplary views for explaining the light irradiation path according to the viewing angle adjustment on the configuration of the display device capable of adjusting the viewing angle according to the present invention.

9 is an exemplary view for explaining a utilization state of the display device capable of adjusting the viewing angle according to the present invention.
※ Explanation of the main symbols in the drawings
100; An image unit, a liquid crystal display (LCD) 200; Front glass
300; Light diffusion suppressing unit, slot film 400; Light Diffusion Control, PDLC
17; Backlight unit

Claims (18)

delete delete delete delete delete delete delete delete delete delete The backlight unit 17 and pixels positioned in front of the backlight unit 17 to control the amount of light emitted from the backlight unit 17 to express luminance and color are arranged in a matrix structure to form a display area. An image unit 100 and a front glass 200 for protecting the image unit 100 and positioned in front of the image unit 100, and positioned in front of the backlight unit 17. It is provided with a light diffusion suppression unit 300 to transmit and give a straightness to the light of the backlight unit 17 irradiated from the back, and is located between the front and the image portion 100 of the light diffusion suppression unit 300 In the display device comprising a light diffusion control unit 400 to scatter or diffuse or maintain the straightness of the light having passed through the light diffusion suppressing unit 300 by an external control signal, The light diffusion suppressing unit 300 is a film of a light transmissive material, the slot (scabbard) is formed for the entire area of the front or back, and then molded by the film of the same material to be flattened by the light diffusion control unit 400 Display angle of the image of the image portion 100 having a straightness imparted through the light diffusion suppressing unit (300) is narrow or diffused to have a wide viewing angle. The method of claim 11, The light diffusion suppressing unit 300 is a film of a light transmissive material, the slot (scabbard) is formed over the entire area of the front or back, and then molded and flattened by a film of the same material is used to laminate Display device that can adjust the viewing angle. The method of claim 11 or 12, The slot (sheath) formed in the light diffusion suppressing unit 300 is a display device capable of adjusting the viewing angle, characterized in that formed through a process such as pressing work or etching. delete delete delete delete 13. The method according to claim 11 or 12, The slot (sheath) formed in the light diffusion suppressing unit 300 is made of any one of a horizontal line, a vertical line, a diagonal line, or a display device capable of adjusting the viewing angle comprising a complex implementation of the horizontal line, vertical line, diagonal.

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