KR20090087570A - Visual angle regulation type display equipment - Google Patents

Abstract

A display device capable of viewing-angle control for converting an extension mode and a reduction mode of visual angle is provided to improve the usability of mobile communication equipment by power consumption of narrow visible angle. A liquid crystal display device(LCD) indicates substantial information. A slot film exists between backlight. And directivity is given to the light light-emitted from the back light. A polymer dispersed liquid crystal diffuses the travel route of the light according to the polymer dispersed liquid crystal.

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.

A display device capable of adjusting the viewing angle according to the present invention for achieving the above object includes an image unit in which pixels representing luminance and color are arranged in a matrix structure to form a display area, and located in front of the image unit. A display element comprising a front glass for protecting the image portion, comprising: light diffusion suppressing means positioned at a front surface of the image portion to impart and transmit straightness to light of an image portion irradiated from a rear surface thereof; A light diffusion control means positioned between the front surface of the light diffusion suppressing means and the front glass and scattering or maintaining the straightness by scattering light having the straightness transmitted through the viewing angle suppressing means by an external control signal; In the light diffusion control means, the viewing angle of the image portion having the straightness imparted through the light diffusion suppressing means is narrow or diffused to have a wide viewing angle.

Another aspect of the display device capable of adjusting the viewing angle according to the present invention for achieving the above object is, the brightness and brightness by controlling the transmission amount of light irradiated from the backlight unit, and located in front of the backlight unit A display element comprising a pixel portion representing a color arranged in a matrix structure to form a display area, and a front glass positioned on the front surface of the image portion to protect the image portion. A light diffusion suppressing means positioned and transmitting the light by giving a straightness to the light of the backlight unit irradiated from the rear surface; And light diffusion control means positioned between the front surface of the light diffusion suppressing means and the image portion to scatter or diffuse or maintain the straightness of light having the linearity transmitted through the viewing angle suppression means by an external control signal; In the light diffusion control means, the viewing angle of the image portion having the straightness imparted through the light diffusion suppressing means is narrow or diffused 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 means is a film of a light transmissive material, the slot (sheath) for the entire area of the front or back After this is formed is molded and planarized by a film of the same material.

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 light diffusion suppressing means is a film of a light transmissive material, and the slot (sheath) for the entire area of the front or back ) Is formed and then flattened by molding with a film of the same material.

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 means is formed through a process such as pressing or etching. There is.

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 light diffusion control means is to use a polymer dispersed liquid crystal (PDLC).

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) An exploded perspective view of a component, wherein the members overlap each other in an up and down arrangement as shown in the drawing to assemble the liquid crystal display module MDL.

The configuration of the liquid crystal display module (MDL) 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 refers to a frame-shaped shield case (metal frame) made of a metal plate. LCW is its display window, PNL is a liquid crystal display panel, SPB is a light diffusion plate, LCB is a light guide, RM is a reflector, BL is a backlight fluorescent tube, and LCA is a backlight case.

At this time, the module MDL is fixed to the whole by hooks and hooks installed in the shield case SHD.

In addition, the backlight case LCA is shaped to accommodate the backlight fluorescent tube BL, the light diffusion plate SPB, the light guide LB, and the reflecting plate RM, and is disposed on the side surface of the light guide LB. The light irradiated from the backlight fluorescent tube BL is used as the same backlight on the display surface by the light guide LCB, the reflecting plate RM, and the light diffusion plate SPB, and is irradiated toward the liquid crystal display panel PNL side.

The inverter circuit board PCB2 is connected to the backlight fluorescent tube BL, and is used as a power source for the backlight fluorescent tube BL.

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, the reference numerals RM, LCB, SPB, and PNL in FIG. 1 are displayed on the LCD.

As shown in FIG. 1 and FIG. 2, the backlight BL is actually a conventional technology, and in recent years, uniform luminance is applied to the entire rear surface of the liquid crystal display device referred to as an LCD. It is common to be wide to maintain it.

Therefore, as shown in FIG. 3, the light emitted from the backlight BL is irradiated with light on a straight path and light on a diffused path, and the light penetrates the LCD. The light emitted from the backlight BL while being transmitted to the user's view and transmitted through the liquid crystal display device LCD has a difference in color and brightness so that the user is displayed on the liquid crystal display device. Information is recognized.

Therefore, as shown in FIG. 3, there may be light that goes straight from the backlight BL toward the LCD, but light diffuses radially due to the characteristics of the light. In terms of the angle, the information displayed on the liquid crystal display (LCD) can also be recognized from the side surface, which is called a viewing angle.

Therefore, in order to allow only a direct user to recognize the information displayed on the LCD, the viewing angle is narrowed when the light transmitted to the LCD is blocked or suppressed and transmitted in a direction perpendicular to the LCD. On the contrary, when the light transmitted in the vertical direction with respect to the liquid crystal display (LCD) is diffused, the viewing angle is widened, so that the user recognizes it.

Therefore, a slot or slit is attached to suppress the diffusion path in the path of the light irradiated from the backlight BL to the liquid crystal display device (LCD) so as to be transmitted in a direction perpendicular to the liquid crystal display device (LCD). As shown in Fig. 4, the structural implementation has a narrow viewing angle.

On the other hand, as shown in FIG. 5, the light transmitted from the backlight BL toward the liquid crystal display device (LCD) is diffused in a direction perpendicular to the liquid crystal display (LCD). This will widen the viewing angle.

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. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 is a simplified cross-sectional view illustrating the structural features of the display device capable of adjusting the viewing angle according to the present invention. As an example of the present invention, a liquid crystal display device (LCD) displaying substantial information may be used. And between the backlight BL to recognize the information displayed on the liquid crystal display device at a user's point of view, and according to the concept to which the concept of FIG. 4 is applied. Slot film (SF) to give a straight light to the emitted light, and located in the front of the slot film (SF), depending on whether the DC voltage is applied does not interfere or scatter the progress of light passing through the slot film (SF) It is composed of a polymer dispersed liquid crystal (PDLC) to diffuse the light propagation path.

When the polymer dispersed liquid crystal (PDLC) is described, the polymer dispersed liquid crystal (PDLC) is driven when the DC is applied, but after a moment of maintaining a state that does not react, but when switching the voltage responds to the corresponding voltage Have

In addition, the polymer dispersed liquid crystal (PDLC) is characterized in that it controls the transmission of light according to the scattering intensity of the light and does not require a polarizing plate, the liquid crystal molecular grain of several mm in the polymer (液晶 分子 粒) Several types of structures have been proposed, such as a large number of these dispersed 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, Figure 6 is attached to the structural feature of the display device capable of adjusting the viewing angle according to the present invention using a slot film referred to by reference number SF to maintain a narrow viewing angle, if necessary only the straightness by the slot film (SF) Light is scattered in a polymer dispersed liquid crystal referred to as PDLC to have a wide viewing angle.

Substantially no voltage is applied to the polymer dispersed liquid crystal (PDLC) as described in the above characteristics of the polymer dispersed liquid crystal (PDLC) described above. Therefore, when a wide viewing angle is required, a voltage is applied to the polymer dispersed liquid crystal (PDLC). It is applied to have a narrow viewing angle, but will be described in the opposite concept for ease of explanation.

FIG. 7 is an example in which a voltage is applied to the polymer dispersed liquid crystal (PDLC) so that the direction of the liquid crystal in the polymer dispersed liquid crystal (PDLC) is aligned and the refractive indices of the two liquid crystals coincide with each other. The light emitted from the backlight BL is in the same state as the polymer dispersed liquid crystal PDLC.

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

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) is blocked while maintaining the state of FIG. 7, the light emitted from the backlight BL is shown in FIG. 8. In the state of having straightness in the process via (SF), light is diffused by scattering like blue solid lines by the liquid crystals in the polymer dispersed liquid crystal (PDLC).

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 both flat panel display devices.

That is, display devices generally include display devices using cathode ray tubes, such as cathode ray tubes (CRTs) or vacuum fluorescent displays (VFDs), and backlit display devices such as liquid crystal displays (LCDs), and plasma display panels (PDPs). 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 the display devices is that the light generated by the display device stimulates the user's vision, and at this time, the viewing angle is different depending on the degree of diffusion of the light generated by the display device.

Therefore, the configuration referred to as SF and PDLC is not located in front of the backlight BL as shown in the accompanying FIGS. 6 to 8, but as shown in the accompanying FIG. 9, the display image. If it is located in front of the surface can be applied to all display elements in common.

At this time, the slot film (SF) is a film of a light transmissive material, the slot (scabbard) 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).

In order to maintain straightness for more light, the slot film SF may be laminated and used.

On the other hand, the slot (sheath) formed in the light diffusion suppressing means here 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 implemented in a complex.

While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

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 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 can be replaced or the borrowing of such a device also falls 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.

Claims (18)

In a display element having pixels representing luminance and color arranged in a matrix structure to form a display area, and a front glass positioned at the front of the image portion to protect the image portion: Light diffusion suppressing means which is located in front of the image part and transmits by giving a straightness to the light of the image part irradiated from the rear part; A light diffusion control means positioned between the front surface of the light diffusion suppressing means and the front glass and scattering or maintaining the straightness by scattering light having the straightness transmitted through the viewing angle suppressing means by an external control signal; And a viewing angle with respect to an image of an image portion having a linearity imparted through the light diffusion suppressing means in the light diffusion adjusting means to have a narrow viewing angle or a wide viewing angle. The method of claim 1, The light diffusion suppressing means is a film of a light transmissive material, and the display device is adjustable in the viewing angle, characterized in that the slot (scabbard) is formed over the entire area of the front or back, and then molded and planarized by a film of the same material. The method of claim 1, The light diffusion suppressing means is a film of a light transmissive material, and the viewing angle control, characterized in that the laminated (flat) formed by the film of the same material after the slot (scabbard) is formed over the entire area of the front or rear surface is used by laminating 2 possible display devices. The method of claim 2 or 3, And a slot (sheath) formed in the light diffusion suppressing means is formed through a press work or an etching process. The method of claim 2 or 3, The slot (scabbard) formed in the light diffusion suppressing means 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. The method of claim 1, The light diffusion control means is a display device capable of adjusting the viewing angle, characterized in that using a polymer dispersed liquid crystal (PDLC). The method according to claim 1 or 6, Viewing angle adjustment is characterized in that the partial or selective viewing angle adjustment is possible by changing the position and size of the transparent electrode of the external control signal input terminal of the polymer dispersed liquid crystal (PDLC) used as the light diffusion control means. Possible display device. The method of claim 1, The light diffusion control means is a display device capable of adjusting the viewing angle, characterized in that using a polymer stabilized liquid crystal (PSLC). The method according to claim 1 or 8, Partial or selective viewing angle adjustment is possible by changing the position and size of the transparent electrode of the external control signal input terminal of the polymer stabilized liquid crystal (PSLC) used as the light diffusion control means. Display device. An image unit in which a backlight unit and a pixel, which is located in front of the backlight unit and controls the amount of light emitted from the backlight unit to express luminance and color, are arranged in a matrix structure to form a display area; A display element positioned at and having a front glass for protecting the image portion: Light diffusion suppressing means positioned at a front surface of the backlight unit and configured to transmit and transmit straightness to the light of the backlight unit irradiated from the rear surface; And light diffusion control means positioned between the front surface of the light diffusion suppressing means and the image portion to scatter or diffuse or maintain the straightness of light having the linearity transmitted through the viewing angle suppression means by an external control signal; And a viewing angle with respect to an image of an image portion having a linearity imparted through the light diffusion suppressing means in the light diffusion adjusting means to have a narrow viewing angle or a wide viewing angle. The method of claim 10, The light diffusion suppressing means is a film of a light transmissive material, and the display device is adjustable in the viewing angle, characterized in that the slot (scabbard) is formed over the entire area of the front or back, and then molded and planarized by a film of the same material. The method of claim 10, The light diffusion suppressing means is a film of a light transmissive material, and the viewing angle control, characterized in that the laminated (flat) formed by the film of the same material after the slot (scabbard) is formed over the entire area of the front or rear surface is used by laminating 2 possible display devices. The method of claim 11 or 12, And a slot (sheath) formed in the light diffusion suppressing means is formed through a press work or an etching process. The method of claim 10, The light diffusion control means is a display device capable of adjusting the viewing angle, characterized in that using a polymer dispersed liquid crystal (PDLC). The method according to claim 10 or 14, Viewing angle adjustment is characterized in that the partial or selective viewing angle adjustment is possible by changing the position and size of the transparent electrode of the external control signal input terminal of the polymer dispersed liquid crystal (PDLC) used as the light diffusion control means. Possible display device. The method of claim 10, The light diffusion control means is a display device capable of adjusting the viewing angle, characterized in that using a polymer stabilized liquid crystal (PSLC). The method according to claim 10 or 16, Partial or selective viewing angle adjustment is possible by changing the position and size of the transparent electrode of the external control signal input terminal of the polymer stabilized liquid crystal (PSLC) used as the light diffusion control means. Display device. The method according to claim 11 or 12, The slot (scabbard) formed in the light diffusion suppressing means 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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